Journal articles: 'Stabilization of recycled aggregate'

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Deng, Miaoyi, Xiangbing Xie, Kaiwei Wang, Mingwei Wang, Jinggan Shao, Zi Yun Li, and Hui Wang. "Investigating the Effects of Recycled Micropowder and Aggregate on the Properties of Cement Stabilization of Crushed Aggregate (CSCA)." Advances in Materials Science and Engineering 2022 (September 21, 2022): 1–12. http://dx.doi.org/10.1155/2022/6757742.

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The recycled powder produced in the process of crushing concrete and brick waste (C&BW) into recycled aggregate will cause environmental pollution. To realize the green full recycling of concrete and brick waste, the cement stabilization of crushed aggregate (CSCA) containing recycled brick-concrete composite micropowder (RBCP) and recycled brick-concrete composite aggregate (RBCA) is proposed. In this paper, RBCP, recycled brick-concrete composite fine aggregate (RBCFA), and recycled brick-concrete composite coarse aggregate (RBCCA) were the recycled materials from C&BW. The orthogonal test table was used to analyze the effects of the three recycled materials on the compaction characteristics, mechanical properties, and shrinkage behavior of CSCA at different dosages. The effects of RBCP, RBCCA, and RBCFA on the properties of CSCA are studied by variance analysis methods. On this basis, the micromorphology and the interface transition zone (ITZ) were studied for CSCA and the cement stabilization of crushed aggregate with RBCP, RBCFA, and RBCCA through scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS), and the mechanism was revealed. The results indicate that the addition of RBCP and RBCA can increase the optimal water content while decreasing the optimal dry density of CSCA, and the influence of RBCCA on the optimal water content is greater than that of RBCFA. Three optimal composite replacement systems for CSCA, including 20% RBCP/20%RBCFA/40%RBCCA, are proposed and have the best mechanical and antishrinkage performance through the range analysis. Furthermore, the variance analysis test results show that RBCCA and RBCFA have the most significant effect on the compressive strength and shrinkage strain properties, while RBCP has the most significant effect on the bending tensile strength. It is found that RBCP played a filling effect and pozzolanic activity in the strength formation of CSCA. The SEM/EDS test shows that the CSCA with recycled materials produced the Ca/Si ratio in the interfacial zone between the cement paste and aggregate lower than the CSCA without recycled materials, the largest decline 52.83%. The research results of this paper can provide the potential application of RBCP and RBCA.

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Zhang, Yang, Bora Cetin, and Tuncer B. Edil. "Seasonal Performance Evaluation of Pavement Base Using Recycled Materials." Sustainability 13, no. 22 (November 17, 2021): 12714. http://dx.doi.org/10.3390/su132212714.

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Using recycled pavement materials to construct new pavement base is currently an important construction strategy bringing improved sustainability. This study investigates the long-term performance of pavement bases constructed with recycled concrete aggregate (RCA), reclaimed asphalt pavement (RAP), and blends with natural aggregates in a seasonal frost region. The stabilization effect of fly ash on RAP was studied as well. In situ falling weight deflectometer (FWD) tests were routinely conducted to provide seasonal deflection data, which were used to back-calculate the layer modulus. Seasonal changes in the base layer modulus along with the pavement ride quality were monitored. One of the two lanes at the test sections was consistently subjected to traffic loading, whereas the other one was not. Findings from this field research indicated that after undergoing over 8 years of naturally seasonal freeze-thaw conditions, 100% RCA, 50% RCA, plus 50% natural aggregates, and 100% RAP, presented improved performance over 100% natural aggregates. However, 50% RAP blended with 50% natural aggregates performed comparably to natural aggregates only, and fly ash did not provide considerable improvement on the long-term performance of 50% RAP plus 50% natural aggregate base. Seasonal climatic variations turned out to affect pavement performance more critically than traffic loading.

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Anastasiou, Eleftherios, Michail Papachristoforou, Dimitrios Anesiadis, Konstantinos Zafeiridis, and Eirini-Chrysanthi Tsardaka. "Investigation of the Use of Recycled Concrete Aggregates Originating from a Single Ready-Mix Concrete Plant." Applied Sciences 8, no. 11 (November 3, 2018): 2149. http://dx.doi.org/10.3390/app8112149.

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The waste produced from ready-mixed concrete (RMC) industries poses an environmental challenge regarding recycling. Three different waste products form RMC plants were investigated for use as recycled aggregates in construction applications. Crushed hardened concrete from test specimens of at least 40 MPa compressive strength (HR) and crushed hardened concrete from returned concrete (CR) were tested for their suitability as concrete aggregates and then used as fine and coarse aggregate in new concrete mixtures. In addition, cement sludge fines (CSF) originating from the washing of concrete trucks were tested for their properties as filler for construction applications. Then, CSF was used at 10% and 20% replacement rates as a cement replacement for mortar production and as an additive for soil stabilization. The results show that, although there is some reduction in the properties of the resulting concrete, both HR and CR can be considered good-quality recycled aggregates, especially when the coarse fraction is used. Furthermore, HR performs considerably better than CR both as coarse and as fine aggregate. CSF seems to be a fine material with good properties as a filler, provided that it is properly crushed and sieved through a 75 μm sieve.

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Jochem, Lidiane Fernanda, Cézar Augusto Casagrande, Marilda Barra Bizinotto, Diego Aponte, and Janaíde Cavalcante Rocha. "Study of the solidification/stabilization process in a mortar with lightweight aggregate or recycled aggregate." Journal of Cleaner Production 326 (December 2021): 129415. http://dx.doi.org/10.1016/j.jclepro.2021.129415.

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Xiao, Rui, Pawel Polaczyk, Miaomiao Zhang, Xi Jiang, Yiyuan Zhang, Baoshan Huang, and Wei Hu. "Evaluation of Glass Powder-Based Geopolymer Stabilized Road Bases Containing Recycled Waste Glass Aggregate." Transportation Research Record: Journal of the Transportation Research Board 2674, no. 1 (January 2020): 22–32. http://dx.doi.org/10.1177/0361198119898695.

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As the concept of sustainable pavement gains prominence, a growing number of industrial wastes and recycled materials have been utilized in the pavement industry to preserve natural resources. This study investigates the potential use of waste glass powder-based geopolymer cement as a stabilizing agent in recycled waste glass aggregate (GA) bases. Two recycled materials, waste glass powder (GP) and class F fly ash (FF), were used as the raw materials in the preparation of geopolymer. Virgin aggregate (VA) was replaced by GA at varying replacement ratios as the pavement base materials, and the mechanical behaviors before and after geopolymer stabilization were evaluated. Without stabilization, the incorporation of over 10% GA caused significant detrimental effects on the California bearing ratios (CBR) of base materials, which should be carefully managed in pavement construction. However, all geopolymer stabilized samples showed decent strength properties, indicating the effectiveness of geopolymer stabilization. The use of GA reduced the drying shrinkage of base samples, although the mechanical properties were compromised. During the sample preparation, a higher curing temperature and relative humidity resulted in better mechanical behaviors, and the surface of GA could dissolve in alkaline solution and involve in the geopolymerization at 40°C. The microstructure and minerology of geopolymer stabilizer of base materials were characterized by scanning electron microscopy (SEM) and X-ray defraction (XRD) analyses. This study confirmed the promise of using waste glass-based pavement base materials as the greener substitutes and the potential synergy between waste glass recycling and the pavement industry.

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Softić, Edis, Veljko Radičević, Marko Subotić, Željko Stević, Zlatan Talić, and Dragan Pamučar. "Sustainability of the Optimum Pavement Model of Reclaimed Asphalt from a Used Pavement Structure." Sustainability 12, no. 5 (March 3, 2020): 1912. http://dx.doi.org/10.3390/su12051912.

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This paper demonstrates and provides additional findings and instructions to produce new cold-recycled layers of pavement structures spatially and temporally sustainable. At the same time, recycled pavement structures have been enhanced with optimum amounts of new stone materials and binders made of cement and foamed bitumen. The subject of the research is based on the examination of recycled asphalt from surface and bituminous base courses of pavement structures for use on higher-type roads. The aim of the research is to model the process of producing recycled asphalt by cold recycling to optimize the process of influential parameters. In addition, one of the primary goals of the research is to demonstrate a sustainable way of producing new cold-recycled layers of pavement structures. The obtained results indicated the inevitability of the use of recycled material from pavement structures with the possibility of applying secondary and tertiary crushing of recycled mass, which depends on the type of layer for which the recycled material would be used. The research resulted in an optimum mixture variant of the stabilization layer of pavement structure that consists mainly of recycled material from a worn pavement structure improved with a relatively small amount of new aggregate with the addition of minimal stabilizers made of cement and foamed bitumen. The results showed that the optimum mixture variant of the stabilization layer is spatially and temporally stable. Additionally, the presented optimum variant of the stabilization layer enables sustainable development of road networks with minimum consumption of new natural resources.

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Liang, Xin, Fang Yan, Yuliang Chen, Huiqin Wu, Peihuan Ye, and Yuhuan Mo. "Study on the Strength Performance of Recycled Aggregate Concrete with Different Ages under Direct Shearing." Materials 14, no. 9 (April 29, 2021): 2312. http://dx.doi.org/10.3390/ma14092312.

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In order to study the mechanical properties of recycled aggregate concrete (RAC) at different ages, 264 standard cubes were designed to test its direct shear strength and cube compressive strength while considering the parameters of age and recycled aggregate replacement ratio. The failure pattern and load–displacement curve of specimens at direct shearing were obtained; the direct shear strength and residual shear strength were extracted from the load–displacement curves. Experimental results indicate that the influence of the replacement ratio for the front and side cracks of RAC is insignificant, with the former being straight and the latter relatively convoluted. At the age of three days, the damaged interface between aggregate and mortar is almost completely responsible for concrete failure; in addition to the damage of coarse aggregates, aggregate failure is also an important factor in concrete failure at other ages. The load–displacement curve of RAC at direct shearing can be divided into elasticity, elastoplasticity, plasticity, and stabilization stages. The brittleness of concrete decreases with its age, which is reflected in the gradual shortening of the elastoplastic stage. At 28 days of age, the peak direct shear force increases with the replacement ratio, while the trend is opposite at ages of 3 days, 7 days, and 14 days, respectively. The residual strength of RAC decreases inversely to the replacement ratio, with the rate of decline growing over time. A two-parameter RAC direct shear strength calculation formula was established based on the analysis of age and replacement rate to peak shear force of RAC. The relationship between cube compressive strength and direct shear strength of recycled concrete at various ages was investigated.

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Shin, Wooseok, and Young-Kee Kim. "Stabilization characteristics of metal ions in marine-contaminated sediments by recycled aggregate." Journal of Soils and Sediments 17, no. 6 (January 3, 2017): 1806–14. http://dx.doi.org/10.1007/s11368-016-1647-3.

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Tiyasangthong, Sermsak, Piyathida Yoosuk, Kitsada Krosoongnern, Ratchanon Sakdinakorn, Wisitsak Tabyang, Worawit Phojan, and Cherdsak Suksiripattanapong. "Stabilization of Recycled Concrete Aggregate Using High Calcium Fly Ash Geopolymer as Pavement Base Material." Infrastructures 7, no. 9 (September 7, 2022): 117. http://dx.doi.org/10.3390/infrastructures7090117.

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This research investigated high calcium fly ash geopolymer stabilized recycled concrete aggregate (RCA-FAG) as pavement base material. The effect of recycled concrete aggregate (RCA):high calcium fly ash (FA) ratios, sodium silicate (Na2SiO3):sodium hydroxide (NaOH) ratio, and curing time on the unconfined compressive strength (UCS) and scanning electron microscope (SEM) properties of RCA-FAG samples were evaluated. The maximum dry unit weight of the RCA-FAG sample was 20.73 kN/m3 at RCA:FA ratio of 80:20 and Na2SiO3:NaOH ratio of 60:40. The 7-d UCS of RCA-FAG samples increased as the FA content and Na2SiO3:NaOH ratio increased. The 7-d UCS of the RCA-FAG sample was better than that of the RCA with no FA because FA particles filled in RCA particles, resulting in a dense matrix. The 7-d UCS of RCA-FAG samples passed the 7-d UCS requirement for the low-traffic road. All ingredients met the 7-d UCS requirement for the high-traffic road except the sample with RCA:FA of 100:0 and Na2SiO3:NaOH of 50:50 and 60:40. The 7-d SEM images indicated that spherical FA and RCA particles are bonded together, resulting in the dense matrix for all Na2SiO3:NaOH ratios. The proposed equation for predicting the UCS of RCA-FAG offered a good coefficient of correlation, which is useful in designing pavement base material from RCA-FAG material.

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Zabihi-Samani, Masoud, Seyed Payam Mokhtari, and Farzaneh Raji. "Effects of Fly Ash on Mechanical Properties of Concrete." Journal of Applied Engineering Sciences 8, no. 2 (December 1, 2018): 35–40. http://dx.doi.org/10.2478/jaes-2018-0016.

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Abstract Cement is a common and widespread building material over the world. Similarly, carbon dioxide emissions have been significantly increased due to cement production. Alternative low-carbon binders rather than cement have been progressively sought in recent years. Fly ash was found as an available option, since it is being largely disposed annually as a waste material. In this research several studies have been reviewed and recent applications of fly ash on concrete specification, including strength and fracture toughness of green concrete have been perused. Furthermore, transport properties of high volume fly ash after exposure to high temperature and influence of curing temperature on strength development of fly ash-recycled concrete aggregate blends have been investigated. The investigated test results showed that the properties of composites incorporating fly ash depend on the age of the concrete. Test results also revealed that transport properties of concrete increased notably after exposure to 400cº and the results achieved on fly ash-recycled concrete aggregate led to the conclusion that 15% FA is the optimum blend for road stabilization applications.

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Rahardjo, H., V. A. Santoso, E. C. Leong, Y. S. Ng, C. P. H. Tam, and A. Satyanaga. "Use of recycled crushed concrete and Secudrain in capillary barriers for slope stabilization." Canadian Geotechnical Journal 50, no. 6 (June 2013): 662–73. http://dx.doi.org/10.1139/cgj-2012-0035.

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A capillary barrier is a two-layer cover system having distinct hydraulic properties to minimize water infiltration into the underlying soil by utilizing unsaturated soil mechanics principles. In this study, a capillary barrier system was designed as a cover system for a residual soil slope to maintain stability of the slope by minimizing infiltration during heavy rainfalls in the tropics. The capillary barrier system (CBS) was constructed using fine sand as the fine-grained layer and recycled crushed concrete aggregates as the coarse-grained layer. The coarse-grained layer is commonly constructed using gravels or granite chips. However, due to scarcity of aggregates and in consideration of environmental sustainability, recycled crushed concrete aggregates were used as the coarse-grained layer in this project. The suitability of recycled crushed concrete aggregates as a material within the coarse-grained layer of a CBS is subject to the hydraulic property requirement. For comparison, another CBS was constructed using fine sand as the fine-grained layer and a geosynthetic (Secudrain) as the coarse-grained layer. The performance of each constructed CBS on the residual soil slope was monitored using tensiometers installed at different depths — from 0.6 to 1.8 m below the slope surface — and a rainfall gauge mounted on the slope. An adjacent original slope without the CBS was also instrumented using tensiometers and piezometers to investigate the performance and effectiveness of the CBS in reducing rainwater infiltration and maintaining negative pore-water pressures in the slope. Real-time monitoring systems were developed to examine pore-water pressure, rainfall, and groundwater level in the slopes over a 1 year period. Characteristics of pore-water pressure distributions in the residual soil slope under a CBS with recycled crushed concrete aggregates and in the original slope during typical rainfalls are highlighted and compared. The measurement results show that the CBS was effective in minimizing rainwater infiltration and therefore, maintaining stability of the slope.

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Kianimehr, Marzieh, Piltan Tabatabaie Shourijeh, Seyed Mohammad Binesh, Alireza Mohammadinia, and Arul Arulrajah. "Utilization of recycled concrete aggregates for light-stabilization of clay soils." Construction and Building Materials 227 (December 2019): 116792. http://dx.doi.org/10.1016/j.conbuildmat.2019.116792.

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Nili, Mahmoud, Hossein Sasanipour, and Farhad Aslani. "The Effect of Fine and Coarse Recycled Aggregates on Fresh and Mechanical Properties of Self-Compacting Concrete." Materials 12, no. 7 (April 4, 2019): 1120. http://dx.doi.org/10.3390/ma12071120.

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Today, the use of recycled aggregates as a substitute for a part of the natural aggregates in concrete production is increasing. This approach is essential because the resources for natural aggregates are decreasing in the world. In the present study, the effects of recycled concrete aggregates as a partial replacement for fine (by 50%) and coarse aggregates (by 100%) were examined in the self-compacting concrete mixtures which contain air-entraining agents and silica fumes. Two series of self-compacting concrete mixes have been prepared. In the first series, fine and coarse recycled mixtures respectively with 50% and 100% replacement with air entraining agent were used. In the second series, fine recycled (with 50% replacement) and coarse recycled (with 100% replacement) were used with silica fume. The rheological properties of the self-compacting concrete (SCC) were determined using slump-flow and J-ring tests. The tests of compressive strength, tensile strength, and compressive stress-strain behavior were performed on both series. The results indicated that air-entraining agent and silica fume have an important role in stabilization of fresh properties of the mixtures. The results of tests indicated a decrease in compressive strength, modulus of elasticity, and energy absorption of concrete mixtures containing air entrained agent. Also, the results showed that complete replacement (100%) with coarse recycled material had no significant effect on mechanical strength, while replacement with 50% fine recycled material has reduced compressive strength, tensile strength, and energy absorption.

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Khabiri, Mohammad Mehdi, and Bahareh Ebrahimialavijeh. "Effect of Modifying Aggregates by Rap and the Simultaneous use of Adhesives for the Stabilization of a Sandy Pavement Subgrade." Slovak Journal of Civil Engineering 29, no. 2 (June 1, 2021): 1–8. http://dx.doi.org/10.2478/sjce-2021-0008.

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Abstract The improvement, reconstruction and repair of roads in recent years have increased the content of recycled asphalt in pavements. Using these materials in road construction projects because they reduce the costs, will also be of great help in improving environmental issues. In the present study, dune sand, which can be found in most desert area soil but does not have proper strength and loading capacity for a subgrade, was used. In order to increase the strength parameters of dune sand, various contents of cement and recycled asphalt were examined in California Bearing Ratio (CBR) and compressive strength tests. The results showed that the addition of cement and recycled asphalt can increase compressive strength and bearing capacity and reduce rupture deformations. In a stabilized sample with 27.5% recycled asphalt, increasing the cement from 7.5 to 12.5% increased the compressive strength by 1.045 times, which is the highest amount of change in the samples studied. The maximum CBR and minimum rupture deformations are related to 35% of the recycled asphalt and 12.5% of the cement. The predicted functions of the compressive strength, deformation and CBR depend on two variables of the cement content; the recycled asphalt was then calculated using the response surface method

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Ben Maaouia, Oumeima, Rabah Hamzaoui, Abdelkrim Bennabi, Johan Colin, and Horacio Colina. "Chromium stabilization and trapping in the cement matrix of recycled concrete aggregates." Construction and Building Materials 191 (December 2018): 667–78. http://dx.doi.org/10.1016/j.conbuildmat.2018.09.172.

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Tabatabaie Shourijeh, Piltan, Amir Masoudi Rad, Farhad Heydari Bahman Bigloo, and Seyed Mohammad Binesh. "Application of recycled concrete aggregates for stabilization of clay reinforced with recycled tire polymer fibers and glass fibers." Construction and Building Materials 355 (November 2022): 129172. http://dx.doi.org/10.1016/j.conbuildmat.2022.129172.

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Crovetti, James A. "Construction and Performance of Fly Ash-Stabilized Cold In-Place Recycled Asphalt Pavement in Wisconsin." Transportation Research Record: Journal of the Transportation Research Board 1730, no. 1 (January 2000): 161–66. http://dx.doi.org/10.3141/1730-19.

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Cold in-place recycling (CIR) is a common rehabilitation practice used in Wisconsin to improve the ride quality and structural capacity of deteriorated asphalt pavements. In recent years, increased emphasis has been placed on incorporating stabilizers into the CIR materials to improve the structural capacity of the CIR base layer. This improvement can serve to increase the performance life of the completed pavement or to allow for a reduced hot-mix asphalt (HMA) surface thickness. The city of Mequon, Wisconsin, included asphalt emulsion and fly ash CIR stabilization over a portion of its CIR projects in 1997. Presented are the findings relating to the constructability of the fly ash–stabilized CIR pavement as well as performance trends for the CIR pavements based on distress and deflection testing results. CIR is a common rehabilitation practice used in Wisconsin to improve the ride quality and structural capacity of deteriorated asphalt pavements. In one type of CIR application, existing HMA layers are pulverized, graded, and compacted, then used as a base layer for a new HMA surface. The pulverization process is completed to provide uniformity of support to the HMA surface and to significantly reduce or eliminate the occurrence of reflection cracking of the HMA surface. In most CIR applications, pulverization is completed through the full thickness of the existing HMA layers, as well as through the top 25 to 50 mm of aggregate base. Penetration into unbound aggregate base materials aids in cooling of the bits on the pulverizer mandrel. After pulverization, graders typically are used to spread the materials to the desired width and shape. Compaction is achieved by using vibrating steel drum and pneumatic-tire rollers. The moisture content of the CIR materials is adjusted, as necessary, by surface spraying from a water tanker truck.

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Gómez, Melina, Lucas Ernesto Peisino, Jerónimo Kreiker, Rosana Gaggino, Ariel Leonardo Cappelletti, Sandra E. Martín, Paula M. Uberman, María Positieri, and Bárbara Belén Raggiotti. "Stabilization of hazardous compounds from WEEE plastic: Development of a novel core-shell recycled plastic aggregate for use in building materials." Construction and Building Materials 230 (January 2020): 116977. http://dx.doi.org/10.1016/j.conbuildmat.2019.116977.

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Soares, Roberto, Rielle Haichert, Diana Podborochynski, and Curtis Berthelot. "Modeling in Situ Performance of Cement-Stabilized Granular Base Layers of Urban Roads." Transportation Research Record: Journal of the Transportation Research Board 2363, no. 1 (January 2013): 88–95. http://dx.doi.org/10.3141/2363-10.

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This study used a three-dimensional nonlinear orthotropic computational road model to measure the performance of reclaimed and recycled portland cement concrete (PCC) aggregates and reclaimed asphalt pavement (RAP) aggregates stabilized with cement as a base layer in a typical local road structure in the city of Saskatoon, Saskatchewan, Canada. The pavement structure was composed of 45-mm hot-mix asphalt concrete on a 225-mm granular base built directly over an in situ subgrade. The cross section was analyzed with a conventional granular base layer as a baseline and PCC and RAP base layers with 2% cement stabilization. The cement-stabilized PCC and RAP base layers showed improved shear strain and horizontal strain behavior when compared with the conventional granular base layer (which was not cement stabilized). This improvement con-firmed that cement stabilization of reclaimed PCC and RAP materials provided an enhanced primary response. This study demonstrated that typical thin Saskatoon pavement structures were highly dependent on the constitutive properties of base layer material. Stabilizing the PCC and RAP base layers with 2% cement reduced the maximum shear strains at the edge of the pavement structure by 12% and 25%, respectively, compared with the unstabilized conventional granular base layer. It was believed that the increased fracture and cohesion of the residual cementitious materials inherent to recycled granular base, as well as the cementitious binder added, improved structural performance.

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Arulrajah, Arul, Alireza Mohammadinia, Itthikorn Phummiphan, Suksun Horpibulsuk, and Wisanukorn Samingthong. "Stabilization of Recycled Demolition Aggregates by Geopolymers comprising Calcium Carbide Residue, Fly Ash and Slag precursors." Construction and Building Materials 114 (July 2016): 864–73. http://dx.doi.org/10.1016/j.conbuildmat.2016.03.150.

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Baroughi, Mahdi Zirak, Amir Hassan Rezaei, and Hooshang Katebi. "Influence of “Nicoflok” Polymer-Mineral with Portland Cement on Granular Soils and Recycled Asphalt Material." Baltic Journal of Road and Bridge Engineering 15, no. 5 (December 23, 2020): 94–117. http://dx.doi.org/10.7250/bjrbe.2020-15.509.

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In road construction projects, due to the high volume of soil materials, the costs of supplying and transporting high-quality materials are very high, they may also include the crossing between different geotechnical lands with different types of soils and soil stabilization used to modify resistance characteristics of soil materials in different layers of the road. Addition of a stabilizing agent can improve the properties of aggregates and subgrade soils. In this study, the effect caused by the combined action of polymer-mineral composition “Nicoflok” and cement stabilization on the strength characteristics and durability of local materials, adopted from under-construction Ilkhchi highway project, was investigated. In addition, the effects of stabilizers on the recycled asphalt materials was studied to assess the possibility of using them in the pavement structure. Samples with 0, 0.5, 0.9 and 1.3 percent of Nicoflok combined with varying percentages of cement content were made and CBR tests were conducted after curing. Strength degradation of samples under 50 cycles of freeze-thaw was also investigated. The results show that addition of cement- Nicoflok admixture to the subgrade soil considerably increases CBR values, which leads to reduction of the required material amount. The efficiency of this polymer with Portland cement depends on several factors, such as the amount of cement, curing time, size and shape of soil grains. The optimum dosage of Nicoflok was 0.9% mixed with 1% cement. Stabilizing the base and recycled asphalt materials with cement and Nicoflok also improves the long-term performance of the pavement.

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Lu, Chien-Chih, Ming Huang Hsu, and Yi-Pin Lin. "Evaluation of heavy metal leachability of incinerating recycled aggregate and solidification/stabilization products for construction reuse using TCLP, multi-final pH and EDTA-mediated TCLP leaching tests." Journal of Hazardous Materials 368 (April 2019): 336–44. http://dx.doi.org/10.1016/j.jhazmat.2019.01.066.

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Fernanda Jochem, Lidiane, and Janaíde Cavalcante Rocha. "Potential Use of the Prewetting of Recycled and Lightweight Aggregates to Improve Cement Pastes for Residue Solidification/Stabilization Systems with Chromium and Zinc." Journal of Materials in Civil Engineering 33, no. 8 (August 2021): 04021200. http://dx.doi.org/10.1061/(asce)mt.1943-5533.0003800.

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Losini, Alessia Emanuela, Anne-Cecile Grillet, Monika Woloszyn, Liudmila Lavrik, Chiara Moletti, Giovanni Dotelli, and Marco Caruso. "Mechanical and Microstructural Characterization of Rammed Earth Stabilized with Five Biopolymers." Materials 15, no. 9 (April 26, 2022): 3136. http://dx.doi.org/10.3390/ma15093136.

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This study aims to check the compatibility of a selection of waste and recycled biopolymers for rammed earth applications in order to replace the more common cement-based stabilization. Five formulations of stabilized rammed earth were prepared with different biopolymers: lignin sulfonate, tannin, sheep wool fibers, citrus pomace and grape-seed flour. The microstructure of the different formulations was characterized by investigating the interactions between earth and stabilizers through mercury intrusion porosimetry (MIP), nitrogen soprtion isotherm, powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The unconfined compressive strength (UCS) was also evaluated for all stabilized specimens. Three out of five biopolymers were considered suitable as rammed earth stabilizers. The use of wool increased the UCS by 6%, probably thanks to the combined effect of the length of the fibers and the roughness of their surfaces, which gives a contribution in binding clay particles higher than citrus and grape-seed flour. Lignin sulfonate and tannin increased the UCS by 38% and 13%, respectively, suggesting the additives’ ability to fill pores, coat soil grains and form aggregates; this capability is confirmed by the reduction in the specific surface area and the pore volume in the nano- and micropore zones.

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Losini, Alessia Emanuela, Anne-Cecile Grillet, Monika Woloszyn, Liudmila Lavrik, Chiara Moletti, Giovanni Dotelli, and Marco Caruso. "Mechanical and Microstructural Characterization of Rammed Earth Stabilized with Five Biopolymers." Materials 15, no. 9 (April 26, 2022): 3136. http://dx.doi.org/10.3390/ma15093136.

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This study aims to check the compatibility of a selection of waste and recycled biopolymers for rammed earth applications in order to replace the more common cement-based stabilization. Five formulations of stabilized rammed earth were prepared with different biopolymers: lignin sulfonate, tannin, sheep wool fibers, citrus pomace and grape-seed flour. The microstructure of the different formulations was characterized by investigating the interactions between earth and stabilizers through mercury intrusion porosimetry (MIP), nitrogen soprtion isotherm, powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The unconfined compressive strength (UCS) was also evaluated for all stabilized specimens. Three out of five biopolymers were considered suitable as rammed earth stabilizers. The use of wool increased the UCS by 6%, probably thanks to the combined effect of the length of the fibers and the roughness of their surfaces, which gives a contribution in binding clay particles higher than citrus and grape-seed flour. Lignin sulfonate and tannin increased the UCS by 38% and 13%, respectively, suggesting the additives’ ability to fill pores, coat soil grains and form aggregates; this capability is confirmed by the reduction in the specific surface area and the pore volume in the nano- and micropore zones.

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Losini, Alessia Emanuela, Anne-Cecile Grillet, Monika Woloszyn, Liudmila Lavrik, Chiara Moletti, Giovanni Dotelli, and Marco Caruso. "Mechanical and Microstructural Characterization of Rammed Earth Stabilized with Five Biopolymers." Materials 15, no. 9 (April 26, 2022): 3136. http://dx.doi.org/10.3390/ma15093136.

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This study aims to check the compatibility of a selection of waste and recycled biopolymers for rammed earth applications in order to replace the more common cement-based stabilization. Five formulations of stabilized rammed earth were prepared with different biopolymers: lignin sulfonate, tannin, sheep wool fibers, citrus pomace and grape-seed flour. The microstructure of the different formulations was characterized by investigating the interactions between earth and stabilizers through mercury intrusion porosimetry (MIP), nitrogen soprtion isotherm, powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The unconfined compressive strength (UCS) was also evaluated for all stabilized specimens. Three out of five biopolymers were considered suitable as rammed earth stabilizers. The use of wool increased the UCS by 6%, probably thanks to the combined effect of the length of the fibers and the roughness of their surfaces, which gives a contribution in binding clay particles higher than citrus and grape-seed flour. Lignin sulfonate and tannin increased the UCS by 38% and 13%, respectively, suggesting the additives’ ability to fill pores, coat soil grains and form aggregates; this capability is confirmed by the reduction in the specific surface area and the pore volume in the nano- and micropore zones.

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Holovko, Serhii. "A NEW APPROACH TO REPAIR OF NON-RIGID ROAD PAVEMENT TRANSITIONAL TYPE." Avtoshliakhovyk Ukrayiny 264, no. 4 (December 21, 2020): 47–51. http://dx.doi.org/10.33868/0365-8392-2020-4-264-47-51.

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Earlier, due to insufficient financing of the road industry, funds were allocated on a leftover basis for the repair of local roads, over time the condition of these roads has deteriorated significantly. So, given the ramified network of local roads, the issue of restoring the condition of local roads is a very urgent problem. Conducted exploratory studies of the application of stabilization technology to restore the condition of local roads show that this technology is progressive, since it allows reusing existing materials while ensuring the required strength of the pavement. However, design engineers rarely use this technology, probably due to insufficient research on this approach. The task is to investigate the possibility of using stabilization technology with the use of crushed stone layers of different composition and their maximum reuse, when repairing transitional pavements. Analysis shows that there are many cases where transitional structures have significant heterogeneity and low strength. This is formed due to a weak crushed stone base and waterlogging of the subgrade soils. Over time, soil particles penetrate into the crushed stone layer and weaken the contacts between the crushed stones, as a result of which rut, pits and subsidence form on the road, which significantly complicates the movement of vehicles. Studies of the composition of existing bases show that if in a dispersed system the amount of crushed stone grains is more than 50% by volume, then a contact frame is formed in the material. Intergranular voids are filled with soil or fine aggregate, processing with such a small amount of a mineral binder (cement or lime) allows it to be significantly strengthened, as well as to create bonds between the soil and crushed stone. Modern self-propelled soil mixing machines (recycler-stabilizer) allow in one pass to perform milling (loosening) and mixing of materials of existing transitional pavement to a depth of 40 cm. Taking into account the dependence of the distribution of normal stress in a two-layer half-space, it can be seen that stabilization of the foundation to a depth of 40 cm will allow the subgrade soil to work without exceeding the permissible shear deformations. The construction of the experimental site in Berezivka, Odessa region, confirmed the assumptions about the effectiveness of the proposed solution to restore the strength of transitional pavement. Keywords: non-rigid pavement of transition type, modulus of elasticity, stabilization, rubble, soil, cold recycling.

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Noguchi, T., A. Koyama, and Y. Suzuki. "Japanese Industrial Standards of Recycled Aggregate and Recycled Concrete using Recycled Aggregate." Concrete Journal 45, no. 7 (2007): 5–12. http://dx.doi.org/10.3151/coj1975.45.7_5.

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Šefflová, Magdaléna, and Tereza Pavlů. "Influence of Recycled Aggregate Quality on Recycled Concrete." Advanced Materials Research 1106 (June 2015): 45–48. http://dx.doi.org/10.4028/www.scientific.net/amr.1106.45.

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This article deals with the influence of recycled aggregate quality on recycled concrete. Replacement of natural aggregate by recycling aggregate has a negative influence on the properties of concrete. Three types of recycled aggregate were used for the production of concrete. The samples of recycled aggregate were obtained from two recycling plants in the Czech Republic. The samples of recycled aggregate were tested by pycnometric method. From the test results, a different quality of recycled aggregate was discovered. For the testing of concrete, a total of eight concrete mixtures were made, one of which was a reference mixture and the natural aggregate was replaced by recycled aggregate of varying ratio in the other mixtures. Finally, it is possible to say that use of recycled aggregate in concrete influences the properties of concrete. This influence depends on the quality and amount of recycled aggregate in the concrete.

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Wang, Bo, Libo Yan, Qiuni Fu, and Bohumil Kasal. "A Comprehensive Review on Recycled Aggregate and Recycled Aggregate Concrete." Resources, Conservation and Recycling 171 (August 2021): 105565. http://dx.doi.org/10.1016/j.resconrec.2021.105565.

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Deshpande, Neela, and S. S. Kulkarni. "Critical Analysis of Recycled Aggregate and Concrete with Recycled Aggregate." Applied Mechanics and Materials 99-100 (September 2011): 1274–80. http://dx.doi.org/10.4028/www.scientific.net/amm.99-100.1274.

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One of the construction sector's major contributions to the preservation of the Environment and sustainable development is the reuse and recycling of the waste materials it generates (reducing, reusing, recycling and regenerating the residues that originate the constructive activity). With this view an experimental program was undertaken which helped in judging the effectiveness of using Recycled aggregate in concrete ,by assessing the properties of Recycled aggregates – Coarse and Fine. Further with the guidance of IS 10262:2009 ,Concrete mix was designed for 28 day compressive strength as 25N/mm2 using conventionally used aggregates and Recycled aggregates. From economy perspective an attempt was made to use superplasticser to reduce cement consumption. With reference to the experimental results, analysis of important properties of both the types of concrete is done and the suitability of use of recycled concrete aggregate for new concrete is judged.

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Sukmak, Patimapon, Gampanart Sukmak, Suksun Horpibulsuk, Sippakarn Kassawat, Apichat Suddeepong, and Arul Arulrajah. "Improved Mechanical Properties of Cement-Stabilized Soft Clay Using Garnet Residues and Tire-Derived Aggregates for Subgrade Applications." Sustainability 13, no. 21 (October 22, 2021): 11692. http://dx.doi.org/10.3390/su132111692.

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The growth of the global economy in recent years has resulted in an increase in infrastructure projects worldwide and consequently, this has led to an increase in the quantity of waste generated. Two recycled materials, namely garnet residues (GR) and tire-derived aggregates (TDA), were used to improve mechanical properties of soft clay (SC) subgrade in this study. GR was evaluated as a replacement material in SC prior to Type I Portland cement stabilization. TDA was also studied as an elastic material in cement-stabilized SC–GR. The laboratory tests on the cement–TDA-stabilized SC–GR included unconfined compressive strength (UCS), indirect tensile stress (ITS) and indirect tensile fatigue (ITF). Microstructural analysis on the cement–TDA-stabilized SC–GR was also performed to illustrate the role of GR and TDA contents on the degree of hydration. The UCS of cement-stabilized SC–GR increased when cement content increased from 0% to 2%. Beyond 2% cement content, the UCS development was slightly slower, possibly due to the presence of insufficient water for hydration. The GR reduces the specific surface and particle contacts of the SC–GR blends to be bonded with cementitious products. The optimum SC:GR providing the highest UCS was found to be 90:10 for all cement contents. Increased amounts of GR led to a reduction in UCS values due to its high water absorption, resulting in the insufficient water for the cement hydration. Moreover, the excessive GR replacement ratio weakened the interparticle bond strength due to its smooth and round particles. The TDA addition can enhance the fatigue resistance of the cement-stabilized SC–GR. The maximum fatigue life was found at 2% TDA content. The excessive TDA caused large amounts of micro-cracks in cement–TDA-stabilized SC–GR due to the low adhesion property of TDA. The SC:GR = 90:10, cement content = 2% and TDA content = 2% were suggested as the optimum ingredients. The outcome of this research will promote the usage of GR and TDA to develop a green high-fatigue-resistant subgrade material.

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P.C., Yong, and Teo D.C.L. "Utilisation of Recycled Aggregate as Coarse Aggregate in Concrete." Journal of Civil Engineering, Science and Technology 1, no. 1 (August 1, 2009): 1–6. http://dx.doi.org/10.33736/jcest.60.2009.

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In this rapid industrialised world, recycling construction material plays an important role to preserve the natural resources. In this research, recycled concrete aggregates (RCA) from site-tested concrete specimens were used. These consist of 28-days concrete cubes after compression test obtained from a local construction site. These concrete cubes are crushed to suitable size and reused as recycled coarse aggregate. The amount of recycled concrete aggregate used in this research is approximately 200 kg. Many researchers state that recycled aggregates are only suitable for non-structural concrete application. This research, however, shows that the recycled aggregates that are obtained from site-tested concrete specimen make good quality concrete. The compressive strength of recycled aggregate concrete (RAC) is found to be higher than the compressive strength of normal concrete. Recycled aggregate concrete is in close proximity to normal concrete in terms of split tensile strength, flexural strength and wet density. The slump of recycled aggregate concrete is low and that can be improved by using saturated surface dry (SSD) coarse aggregate.

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Wang, Xingguo, Fei Cheng, Yixin Wang, Xianggang Zhang, and Haicheng Niu. "Impact Properties of Recycled Aggregate Concrete with Nanosilica Modification." Advances in Civil Engineering 2020 (September 2, 2020): 1–10. http://dx.doi.org/10.1155/2020/8878368.

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The optimal soaking time and nanosilica concentration were chosen by the physical properties of the nanosilica-modified recycled aggregate. Recycled aggregate concrete (RAC) and nanosilica recycled aggregate concrete (SRAC) were fabricated by using ordinary recycled aggregate and nanosilica-modified recycled aggregate. Based on the comparative experimental study of basic mechanical properties, the effects of nanosilica recycled aggregate(SRA) modification and recycled aggregate(RA) replacement percentage on the basic mechanical properties of recycled concrete were analyzed. Finally, the split-Hopkinson pressure bar (SHPB) was used to conduct comparative experimental research on the impact resistance of recycled aggregate concrete and nanosilica-modified recycled aggregate concrete. The effects of nanosilica recycled aggregate modification and aggregate replacement percentage on failure morphology, dynamic peak stress, dynamic increase factor (DIF), dynamic peak strain were analyzed.

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Xu, Yi Dong, and Jia Ying Sun. "Influence of Recycled Aggregate on Physical and Mechanical Properties of High Performance Recycled Aggregate Concrete." Key Engineering Materials 460-461 (January 2011): 764–67. http://dx.doi.org/10.4028/www.scientific.net/kem.460-461.764.

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Influence of recycled aggregate on slump, compressive strength and chloride ion permeability of recycled aggregate concrete was investigated. As is shown by the results, although recycled aggregate belongs to the category of poor quality aggregate, the properties of high performance recycled aggregate concrete are not reduced dramatically with the increasing amount of recycled aggregate, for recycled aggregate have both positive effects and negative effects on the properties of recycled aggregate concrete. The high performance recycled aggregate concrete can be developed by double-mixture of ultra fine fly ash and superplasticizer.

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Yu, Zexin, Yuanxin Guo, Gongbing Yue, Zhenwen Hu, Chao Liu, Qiuyi Li, and Liang Wang. "Study on Mechanical and Shrinkage Properties of High Belite Sulphoaluminate Cement-Based Green Recycled Aggregate Concrete." Crystals 11, no. 12 (December 4, 2021): 1512. http://dx.doi.org/10.3390/cryst11121512.

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Green recycled aggregate concrete (RAC) with high strength and low shrinkage is prepared based on recycled coarse aggregate produced by the particle-shaping and aggregate-strengthening method and green low-carbon new cement. This not only effectively alleviates the shortage of natural resources, but also improves the performance of recycled aggregate concrete, which is of great significance for multi-channel resource utilization of construction waste. In this study, three kinds of recycled coarse aggregates (RCA), including simple crushing recycled coarse aggregate (JD-RCA), one-time particle-shaping recycled coarse aggregate (KL-RCA) and two-time particle-shaping recycled coarse aggregate (EKL-RCA), were prepared from the preparation technology of recycled aggregate, and high belite sulphoaluminate cement with excellent performance was used. The effects of aggregate quality, aggregate replacement ratio, and cementitious material content on mechanical properties and shrinkage properties of green recycled aggregate concrete were studied in comparison with ordinary Portland cement-based recycled aggregate concrete. The testing results show that the particle-shaping method can effectively improve the aggregate quality. The compressive strength and dry shrinkage performance of recycled aggregate concrete made of particle-shaped aggregate are only a little different from those of natural aggregate concrete, and even the performance of recycled aggregate is better than that of natural aggregate concrete under the condition of a low replacement ratio of recycled aggregate. In addition, high belite sulphoaluminate cement-based recycled aggregate concrete (HBRAC) not only has early strength and rapid hardening, but also has excellent drying shrinkage resistance, and its shrinkage rate can be reduced to more than 75% compared with ordinary Portland cement-based recycled aggregate concrete (OPRAC).

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Mallikarjuna Reddy, Dr V., and M. Manikanta Sai Swaroop. "Effect of Recycled Aggregates on Strength and performance of Recylced Aggregate Concrete." E3S Web of Conferences 184 (2020): 01085. http://dx.doi.org/10.1051/e3sconf/202018401085.

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This study is taken up to utilise the recycled coarse aggregate and recycled fine aggregate as replacement of natural aggregate in concrete mix. It is required to find the percentage of recycled coarse aggragate and recycled fine aggregate, as the strength of concrete can not be achieved by using higher percentaged. The purpose of study is to compare between recycled coarse aggregate and recycled fine aggregate with natural coarse aggregate and sand in terms of specific gravity, water absorption, particle size distribution. Further, this stydy will also consider the difference between the performance of Recycled Aggregate Concrete for different percentages of recycled coarse aggregate and recycled fine aggregate i.e for 0%, 10%, 15%, 20%, 25%, 30%, 35% replacement. The present study is an experimental investigation on the behaviour of recycled aggregate concrete (coarse& fine aggregates) with respect to the strength and performance.

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Yang, Hai Tao, and Shi Zhu Tian. "Experiment on Properties of Recycled Aggregate Concrete." Applied Mechanics and Materials 377 (August 2013): 99–103. http://dx.doi.org/10.4028/www.scientific.net/amm.377.99.

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Objective: Measure and study the mechanical properties and abrasion resistance of recycled aggregate concrete in order to provide experimental basis for the application of recycled aggregate concrete in engineering. Method: Use recycled aggregate concrete with replacement ratio of recycled coarse aggregate respectively for 0%, 30%, 50%, 80% and 100% to do the slump, compressive strength, modulus of elasticity and abrasion resistance tests on them. Result: The workability of concrete decreases with the increase of recycled coarse aggregate content. Mechanical properties of concrete change as the replacement ratios of recycled coarse aggregate change. Conclusion: The recycled aggregate concrete and natural aggregate concrete have similar abrasion resistance. The recycled aggregate concrete can be applied in engineering.

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Jang, Haneol, Jeonghyun Kim, and Alena Sicakova. "Effect of Aggregate Size on Recycled Aggregate Concrete under Equivalent Mortar Volume Mix Design." Applied Sciences 11, no. 23 (November 28, 2021): 11274. http://dx.doi.org/10.3390/app112311274.

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In this paper, the effect of the original aggregate size of the recycled aggregate on the mechanical properties of the recycled aggregate concrete was evaluated. A series of concretes were produced in which natural aggregates, recycled aggregates, and original aggregates in recycled aggregates were matched for a single particle size distribution curve. The replacement levels of recycled aggregate were 25% and 50%, and equivalent mortar volume mix design was applied for recycled aggregate concrete. The results show that the mechanical strength of recycled aggregate concrete increases with increasing original aggregate size. This effect was observed to be greater in concrete using recycled aggregate with a high residual mortar content.

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Arıöz, Ömer, A. Özsoy, and G. Yılmaz. "Concrete with Recycled Aggregate." Key Engineering Materials 264-268 (May 2004): 2145–48. http://dx.doi.org/10.4028/www.scientific.net/kem.264-268.2145.

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41

Radonjanin, Vlastimir, Mirjana Malešev, Snežana Marinković, and Ali Emhemd Saed Al Malty. "Green recycled aggregate concrete." Construction and Building Materials 47 (October 2013): 1503–11. http://dx.doi.org/10.1016/j.conbuildmat.2013.06.076.

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Yao, Shao Wei, Zhen Guo Gao, and Chang Rui Wang. "Study on Performance of Recycled Aggregate Concrete." Key Engineering Materials 477 (April 2011): 280–89. http://dx.doi.org/10.4028/www.scientific.net/kem.477.280.

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The properties of recycled coarse aggregate and the slump, the physical and mechanical properties and durability of recycled aggregate concrete were studied through tests. The results indicate that the slump, compressive strength and durability of concrete with recycled aggregate are lower than that of concrete with natural aggregate when recycled coarse aggregate fully absorbs water. However, the slump can be similar to that of concrete with natural aggregate. The properties of recycled aggregate concrete can be improved by strengthening the recycled coarse aggregate, and it is also found that the recycled coarse aggregate strengthened by grinding is superior to that soaked by chemical solution.

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Peng, Ziyi, Caijun Shi, Zhenguo Shi, Bao Lu, Shu Wan, Zuhua Zhang, Jun Chang, and Tingting Zhang. "Alkali-aggregate reaction in recycled aggregate concrete." Journal of Cleaner Production 255 (May 2020): 120238. http://dx.doi.org/10.1016/j.jclepro.2020.120238.

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Peng, Gai Fei, Juan Yang, and Jing Yan Wang. "Influence of Recycled Aggregate Defects on the Durability of Recycled Aggregate Concrete." Key Engineering Materials 629-630 (October 2014): 173–82. http://dx.doi.org/10.4028/www.scientific.net/kem.629-630.173.

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An experimental investigation was conducted on the durability of recycled aggregate concretes with the water to binder ratios of 0.26 and 0.60, including chloride ion penetration resistance test, freezing-thawing resistance test and water penetration resistance. Natural aggregate, recycled aggregate untreated and recycled aggregate treated by sulfuric acid solution, were employed. Results indicated that, 3 mol/L acid concentration and the 7 days soaking duration was the optimum to remove the attached mortars in recycled aggregate, and its removal rate could reach to 90.8%. Water penetration resistance, chloride ion penetration resistance and freezing-thawing resistance of concrete with 0.26 W/B was superior to that of concrete with 0.60 W/B. The more pores in the internal of concrete with 0.60 W/B could be attributed to that. Durability of recycled aggregate concrete, incorporating recycled aggregate treated by sulfuric acid solution, was improved. In particular, the improvement in recycled high strength concrete was significant.

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Chakradhara Rao, M. "Properties of recycled aggregate and recycled aggregate concrete: effect of parent concrete." Asian Journal of Civil Engineering 19, no. 1 (January 2018): 103–10. http://dx.doi.org/10.1007/s42107-018-0011-x.

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KIKUCHI, Masafumi, Yasuhiro DOUSYOU, Akira YASUNAGA, Kyouji EHARA, and Akira MASUDA. "INFLUENCE OF QUALITY OF RECYCLED AGGREGATE ON QUALITY OF RECYCLED AGGREGATE CONCRETE." Journal of Structural and Construction Engineering (Transactions of AIJ) 60, no. 474 (1995): 11–20. http://dx.doi.org/10.3130/aijs.60.11_5.

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Ceesay, Alhagie Bakary, and Shingo Miyazawa. "Strength Development and Durability of Concrete Containing Recycled Roof Tile Aggregate." Recycling 4, no. 3 (July 18, 2019): 29. http://dx.doi.org/10.3390/recycling4030029.

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The use of recycled aggregate in new concrete has often been limited due to concerns over their quality and structural performance. This research aims to investigate the physical properties of recycled roof tile aggregate and its suitability for concrete production. Physical properties of recycled roof tile aggregate are compared to normal crushed stone aggregate. Effects of recycled roof tile aggregates on strength and durability of recycled roof tile concrete was compared with normal aggregate concrete using mechanical properties and durability tests. The experimental results showed that high water absorption and low strength of aggregate have a great effect on the workability and strength of the concrete containing recycled roof tile aggregate. Aggregate density, water absorption, crushing value and abrasion value of the recycled roof tile aggregate were found to be lower than crushed stone aggregate and concrete containing recycled roof tile aggregate had low strength and slow strength development. Similar durability performance of recycled roof tile aggregate concrete and normal aggregate concrete was observed except when exposed to freezing and thawing.

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Zhu, Ji Qing, Shao Peng Wu, Jin Jun Zhong, and Dong Ming Wang. "Classification of Coarse Recycled Aggregate Used in Asphalt Concrete." Applied Mechanics and Materials 71-78 (July 2011): 1025–30. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.1025.

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Two classification methods for coarse recycled aggregate used in asphalt concrete were investigated in this paper, respectively classifying by coarse recycled aggregate properties and asphalt concrete properties. When classifying by coarse recycled aggregate properties, coarse recycled aggregate was classified into three types by the apparent specific gravity, water absorption, crushed value, Los Angeles abrasion value and brick content of coarse recycled aggregate. When classifying by asphalt concrete properties, coarse recycled aggregate was used to prepare asphalt concrete; and coarse recycled aggregate was classified into three types by the optimum asphalt content ratio (ROAC), theoretical maximum specific gravity ratio (RTMSG) and indirect tensile strength ratio (RITS) of asphalt concrete containing coarse recycled aggregate. The proposed classification criterions of the two classification methods were respectively given.

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Gao, Lin, Yan Shi, and Ya Chang Liu. "Influence Study of Reinforced Fiber on the Impact Resistance Performance of Recycled Aggregate Concrete." Advanced Materials Research 418-420 (December 2011): 250–53. http://dx.doi.org/10.4028/www.scientific.net/amr.418-420.250.

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Recycled aggregate concrete technology has been payed widely attention. In addition to the research on the basic performance of recycled aggregate concrete, the impact resistance performance of recycled aggregate concrete was also involved. Through mixing respectively steel fiber, polypropylene fiber and steel-polypropylene hybrid fiber into the recycled aggregate concrete, the writer studied the impact resistance performance of fiber-reinforced recycled aggregate concrete, and compared the influence of reinforced fiber on the impact resistance performance of recycled aggregate concrete.

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Gao, Lin, Yan Shi, Guo Qiang Xu, Hui Sun, and Hong Bao Ma. "Influence Study of Steel Fiber Shape on the Impact Resistance Performance of Recycled Aggregate Concrete." Applied Mechanics and Materials 174-177 (May 2012): 1512–15. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1512.

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Recycled aggregate concrete technology has been payed widely attention. In addition to the research on the basic performance of recycled aggregate concrete, the impact resistance performance of recycled aggregate concrete was also involved. Through mixing respectively steel fiber, polypropylene fiber and steel-polypropylene hybrid fiber into the recycled aggregate concrete, the writer studied the impact resistance performance of fiber-reinforced recycled aggregate concrete, and compared the influence of reinforced fiber on the impact resistance performance of recycled aggregate concrete.

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Journal articles on the topic 'Stabilization of recycled aggregate'

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