Bibliografie tematiche / Cement composites

Letteratura scientifica selezionata sul tema "Cement composites"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 20 febbraio 2023

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Articoli di riviste sul tema "Cement composites"

1

Čáchová, Monika, Eva Vejmelková, Kateřina Šestáková, Pavel Reiterman, Martin Keppert, Dana Koňáková e Robert Černý. "Basic Physical and Mechanical Properties of Composites Based on Three Different Cements". Key Engineering Materials 677 (gennaio 2016): 186–90. http://dx.doi.org/10.4028/www.scientific.net/kem.677.186.

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This article is focused on cement based composites. Two cements differing in mineralogical composition are utilised as main binder in composites mixtures. Results of measured physical parameters of studied materials are presented. For the sake of comparison, a reference material with Portland cement was also prepared. Basic physical properties (measured by water vacuum saturation method and by helium pycnometry), characterizations of pore system (determined by mercury porosimetry) and mechanical properties are the matter of this study. Composites show various open porosity; the results of open porosity of materials containing special cements show higher values, in comparison with composite based on Portland cement. This fact of course influences other material characteristics - mainly mechanical properties.
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Liu, Hong Yan, Ping Zhao, Chen Feng e Rohit Sharma. "Cement-Sand Based Piezoelectric Smart Composites". Applied Mechanics and Materials 392 (settembre 2013): 9–13. http://dx.doi.org/10.4028/www.scientific.net/amm.392.9.

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In this paper, preliminary investigation of a new cement-sand based piezoelectric composite was conducted for potential structural engineering applications. PZT ceramic powder has been incorporated into cement material to form composite smart materials in earlier studies and showed promising outcome. However, the previous studies were limited to using only PZT and cement. In this study, PZT powder mixed with cement and sand, which is more realistic in civil engineering applications. The compressive strength of the composites with different PZT volume ratios was investigated. The results showed that embed PZTs increased the strength of the composites. Modified Sawyer-Tower circuit was applied to pole the composites in order to obtain the desired electrical properties of the composites. The mechanical and electrical properties of this type of new smart material had been investigated experimentally. Through a series of MTS compression tests, feasibility of using cement-sand based PZT composite materials in civil engineering is evaluated.
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Sikora, Pawel, e Sang-Yeop Chung. "Cement-Based Composites: Advancements in Development and Characterization". Crystals 10, n. 9 (17 settembre 2020): 832. http://dx.doi.org/10.3390/cryst10090832.

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This Special Issue on “Cement-Based Composites: Advancements in Development and Characterization” presents the latest research and advances in the field of cement-based composites. This special issue covers a variety of experimental studies related to fibre-reinforced, photocatalytic, lightweight, and sustainable cement-based composites. Moreover, simulation studies are present in this special issue to provide the fundamental knowledge on designing and optimizing the properties of cementitious composites. The presented publications in this special issue show the most recent technology in the cement-based composite field.
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Jašek, Marek, Jiri Brozovsky, Lucie Mynarzová e Jan Hurta. "Development of Green Engineered Cementitious Composites". Advanced Materials Research 1020 (ottobre 2014): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amr.1020.3.

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A development of fiber-cement composites is often focused on cost-effective and environmentally friendly materials (so-called green materials). Production of this material should produce less waste and it also should use less energy and less natural sources. There are numerous approaches to the development of green composites. One of the possible ways is a utilization of fly ashes instead of the cement part of composite. The paper discusses a development of green cementitious composite which incorporated fly ash materials produced in the Moravian-Silesian region as a partial replacement of the cement part of the composite.
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Davidová, Vendula, e Pavel Reiterman. "AUTOGENOUS SHRINKAGE OF COMPOSITES BASED ON PORTLAND CEMENT". Acta Polytechnica CTU Proceedings 22 (25 luglio 2019): 22–25. http://dx.doi.org/10.14311/app.2019.22.0022.

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Autogenous shrinkage of cement based composites is important property influencing number of their engineering application. Its ultimate value is predominantly determined by mineralogical composition of cement and its particle size distribution. Present paper introduces experimental study focused on the evaluation of various cements of grade CEM I 42.5 produced in Czech Republic in terms of shrinkage under autogenous conditions. Selected cement type is currently the most frequently used cement. Conducted study confirmed essential differences in ultimate values of shrinkage, which is partially determined by its specific surface area. Accompanying tests of mechanical properties indicate the influence of particle size distribution, which controls initial phases of cement hydration.
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Rödel, Michaela, Jörg Teßmar, Jürgen Groll e Uwe Gbureck. "Tough and Elastic α-Tricalcium Phosphate Cement Composites with Degradable PEG-Based Cross-Linker". Materials 12, n. 1 (24 dicembre 2018): 53. http://dx.doi.org/10.3390/ma12010053.

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Dual setting cements composed of an in situ forming hydrogel and a reactive mineral phase combine high compressive strength of the cement with sufficient ductility and bending strength of the polymeric network. Previous studies were focused on the modification with non-degradable hydrogels based on 2-hydroxyethyl methacrylate (HEMA). Here, we describe the synthesis of suitable triblock degradable poly(ethylene glycol)-poly(lactide) (PEG-PLLA) cross-linker to improve the resorption capacity of such composites. A study with four different formulations was established. As reference, pure hydroxyapatite (HA) cements and composites with 40 wt% HEMA in the liquid cement phase were produced. Furthermore, HEMA was modified with 10 wt% of PEG-PLLA cross-linker or a test series containing only 25% cross-linker was chosen for composites with a fully degradable polymeric phase. Hence, we developed suitable systems with increased elasticity and 5–6 times higher toughness values in comparison to pure inorganic cement matrix. Furthermore, conversion rate from α-tricalcium phosphate (α-TCP) to HA was still about 90% for all composite formulations, whereas crystal size decreased. Based on this material development and advancement for a dual setting system, we managed to overcome the drawback of brittleness for pure calcium phosphate cements.
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Sikora, Pawel, Didier Lootens, Maxime Liard e Dietmar Stephan. "The effects of seawater and nanosilica on the performance of blended cements and composites". Applied Nanoscience 10, n. 12 (9 marzo 2020): 5009–26. http://dx.doi.org/10.1007/s13204-020-01328-8.

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AbstractThis study investigates the effects of seawater and nanosilica (3% by weight of cement), on the fresh and hardened properties of cement pastes and mortars produced with two types of low heat cements: Portland pozzolana cement (CEM II) and blast furnace cement (CEM III). The heat of hydration, initial and final setting times, rheological properties, strength development, sorptivity and water accessible porosity of the cement pastes and mortars were determined. The data reveal that cement type has a significant effect on the reaction rate of cement with seawater and nanosilica (NS). Specimens produced with slag-blended cement exhibited a higher cement reaction rate and the composite produced exhibited better mechanical performance, as a result of the additional reaction of alumina rich phases in slag, with seawater. Replacement of freshwater with seawater contributes mostly to a significant improvement of early strength. However, in the case of slag-blended cement, 28 day strength also improved. The incorporation of NS results in additional acceleration of hydration processes, as well as to a decrease in cement setting time. In contrast, the addition of NS results in a noticeable increment in the yield-stress of pastes, with this effect being pronounced when NS is mixed along with seawater. Moreover, the use of seawater and NS has a beneficial effect on microstructure refinement, thus improving the transport properties of cement mortars. Overall, the study has showed that both seawater and NS can be successfully used to accelerate the hydration process of low heat blended cements and to improve the mechanical and transport properties of cement-based composites.
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Ekincioglu, Ozgur, M. Hulusi Ozkul, Yoshihiko Ohama, Silvia Patachia e Georgeta Moise. "Effect of Epoxy Resin Addition on the Moisture Sensitivity of Macro Defect Free Polymer-Cement Composites". Key Engineering Materials 466 (gennaio 2011): 65–72. http://dx.doi.org/10.4028/www.scientific.net/kem.466.65.

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Macro-defect-free (MDF) cements are cement-polymer composites and were developed by Birchall et al. three decades ago. The composites are produced by mixing small amounts of polymer and water with cement. However, they have a different production method than that of cement pastes, which was inspired by rubber production. Mixtures of cement, polymer and water are processed by using a two-roll mill. The composites are known with their high flexural strengths. Unfortunately, there are not any known commercial products using MDF cements because of their poor durability under moisture. In this study, MDF cements were prepared by using poly(vinyl alcohol--vinyl acetate) PVA, calcium aluminate cements and two different types of epoxy resins. Epoxy resins were a diglycidyl ether of bisphenol A and a mixture of a diglycidyl ethers of bisphenol A and F. Durability performance was compared with respect to biaxial flexural strengths, contact angle and atomic force microscopy (AFM) for the specimens stored in water.
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Ni, Zhuo, Xue Xiao Du, Shuai Wang, Feng Xing e Zhan Huang. "Effect of UF/Epoxy Microcapsules on Cement Composite". Advanced Materials Research 443-444 (gennaio 2012): 700–704. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.700.

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Effect of microcapsules on cement composites has been studied. The hydration of cement composite using microcapsules is studied by XRD and thermal techniques, showing that the addition of microcapsules has little affect on the hydration of cement. The pore size distribution and surface area of the cement composite with microcapsule are analyzed, showing a reduction in the pore content of cement composite and makes the pores smaller, which would improve durability and impermeability for designed materials. Damaging on cement and composites containing microcapsules and self-healing of these damagings can be reflected by the changes in their bending strength. When the cracks were generated in the composite, the microcapsules can release adhesive to fill in the space between the crackings, preventing cracking further growth.
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Hancharoen, Kanokon, Parames Kamhangrittirong e Pimsiree Suwanna. "Enhancement of Thermal and Sound Insulation Properties of Cement Composite Roofing Tile by Addition of Nanocellulose Coated Pineapple Fiber and Modified Rubber Tire Waste". Key Engineering Materials 861 (settembre 2020): 465–72. http://dx.doi.org/10.4028/www.scientific.net/kem.861.465.

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In this work, the enhancement of thermal and sound insulation properties of cement composite roofing tile with nanocellulose coated pineapple fiber and modified waste tire rubber is studied. The composite was composed of bacterial nanocellose (BNC) coated pineapple fibers, modified rubber particles, platicizer and type I Portland cement in the weight ratio of 10:50:0.8:100 with the water to cement ratio (w/c) of 0.5. The thermal conducitity of the fiber rubber cement composite could be reduced to 0.1080 ± 0.0048 W/m.K as opposed to 0.3810 ± 0.0041 and 0.5860 ± 0.0050 W/m.K for the fiber cement and the rubber cement composites, respectively. Moreover, the noise reduction coefficient of the fiber rubber cement composite could be increased to 0.2832 as opposed to 0.2143 and 0.1899 for the fiber cement and the rubber cement composites, respectively. These results revealed that adding nanocellulose coated pineapple fiber and modified rubber particles together to the cement composite can enhance the thermal insulation and sound absorption abilities of the composite roof tile significantly better than adding each constituent separately.
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Tesi sul tema "Cement composites"

1

Cheung, Yin Nee. "Investigation of concrete components with a pseudo-ductile layer /". View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20CHEUNGY.

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Guodong, Xu. "Fibre-cement hybrid composites". Thesis, University of Surrey, 1994. http://epubs.surrey.ac.uk/844012/.

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The theoretical stress-strain behaviour of individual fibre reinforced cement composites is reviewed. Based on the multiple cracking concept of the existing theory, analytical expressions are developed to describe the tensile stress-strain behaviour of a fibre-cement hybrid composite consisting of three components, i.e. two reinforcing fibres with different moduli, strengths and strains to failure and a common cement binder. The model predicts that the tensile stress-strain curve of the hybrid composites consists of five stages, instead of three stages of the existing models for individual fibre cements, and relates the tensile behaviour of each stage to the component properties of the components and the test system parameters. A description is given of the physical and mechanical properties of four types of reinforcing fibres used in the study. These were fibrillated polypropylene film, alkali-resistant glass, polyvinyl alcohol fibres and carbon fibres. A small number of direct tensile tests on continuous glass, carbon and polyvinyl alcohol were performed. The tensile stress-strain behaviour of four types of fibre-cement hybrid composites was studied with particular emphasis on that of the glass- polypropylene hybrids for which the flexural load-deflection behaviour was also examined. It is shown that the fibre-cement hybrid composites yield superior engineering properties over their parent composites and the improvements are sensitive to volume fractions of each of the two fibres. The measured tensile stress-strain curves of the hybrids were compared with the theoretical predictions and satisfactory agreement in general is obtained. Implications from the present work for the design of fibre-cement hybrid composites are assessed.
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Cheung, Kwok Fai. "Applications of pseudo-ductile engineered cementitious composites for construction industry /". View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20CHEUNGK.

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Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 314-315). Also available in electronic version. Access restricted to campus users.
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Mohr, Benjamin J. "Durability of Pulp Fiber-Cement Composites". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7222.

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Wood pulp fibers are a unique reinforcing material as they are non-hazardous, renewable, and readily available at relatively low cost compared to other commercially available fibers. Today, pulp fiber-cement composites can be found in products such as extruded non-pressure pipes and non-structural building materials, mainly thin-sheet products. Although natural fibers have been used historically to reinforce various building materials, little scientific effort has been devoted to the examination of natural fibers to reinforce engineering materials until recently. The need for this type of fundamental research has been emphasized by widespread awareness of moisture-related failures of some engineered materials; these failures have led to the filing of national- and state-level class action lawsuits against several manufacturers. Thus, if pulp fiber-cement composites are to be used for exterior structural applications, the effects of cyclical wet/dry (rain/heat) exposure on performance must be known. Pulp fiber-cement composites have been tested in flexure to examine the progression of strength and toughness degradation. Based on scanning electron microscopy (SEM), environmental scanning electron microscopy (ESEM), energy dispersive spectroscopy (EDS), a three-part model describing the mechanisms of progressive degradation has been proposed: (1) initial fiber-cement/fiber interlayer debonding, (2) reprecipitation of crystalline and amorphous ettringite within the void space at the former fiber-cement interface, and (3) fiber embrittlement due to reprecipitation of calcium hydroxide filling the spaces within the fiber cell wall structure. Finally, as a means to mitigate kraft pulp fiber-cement composite degradation, the effects of partial portland cement replacement with various supplementary cementitious materials (SCMs) has been investigated for their effect on mitigating kraft pulp fiber-cement composite mechanical property degradation (i.e., strength and toughness losses) during wet/dry cycling. SCMs have been found to be effective in mitigating composite degradation through several processes, including a reduction in the calcium hydroxide content, stabilization of monosulfate by maintaining pore solution pH, and a decrease in ettringite reprecipitation accomplished by increased binding of aluminum in calcium aluminate phases and calcium in the calcium silicate hydrate (C-S-H) phase.
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Kakemi, Manabu. "Hybrid continuous fibre cement composites". Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/606/.

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Karade, Sukhdeo Rao. "An investigation of cork-cement composites". Thesis, Bucks New University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273892.

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El-Ashkar, Nabil H. "Wood pulp microfibers in cement-based composites : improving fiber distribution and characterizing composite behavior". Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/21518.

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Zhang, Jie. "Microstructure study of cementitious materials using resistivity measurement /". View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202008%20ZHANG.

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McNulty, Thomas A. "The durability of cement bound minestone". Thesis, Aston University, 1985. http://publications.aston.ac.uk/14289/.

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The demand for road making materials continues to pressurise the supply of traditional good quality aggregates. Over the years, therefore, consideration has been given to alternative materials including industrial wastes. This thesis is concerned with potential use of Minestone, the by-product of coal mining, for the lower structural layers of pavement construction. Because of their clay like nature, Minestones do not merit consideration for such applications in an unbound state and, therefore, some form of stabilisation is necessary. Previous research has demonstrated that certain cement bound minestones, containing between 5 and 10 per cent cement, satisfy current Department of Transport requirements for use in pavement construction and, furthermore, they are not frost susceptible. However, doubts concerning the durability of cement bound minestones still remain. The thesis includes a review of both the cement and lime stabilisation techniques and also traces the origin and development of the methods used to assess the quality and durability of stabilised materials. An experimental study is described in which cement bound minestone specimens were subjected to a programme of tests which examined compressive strength, resistance to immersion, and resistance to freezing and thawing. The results of the tests were related to the properties of the raw materials. It was discovered that the response to cement stabilisation was governed mainly by the source of the minestone and, to a lesser degree, the cement content. It was also found that resistance in the durability tests was generally improved when the initial moisture content was raised above the optimum value. The result suggest that current methods for assessing cement stabilised materials are not appropriate to cement bound minestones. Alternative methods and criteria, based on volume change and retained strength following immersion and freeze-thaw tests, have been proposed. It is believed that these methods and criteria should also apply to other cement bound materials.
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Boulfiza, Mohamed. "Constitutive modeling of fiber reinforced cement composites". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0004/NQ27111.pdf.

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Libri sul tema "Cement composites"

1

Balaguru, Perumalsamy N. Fiber-reinforced cement composites. New York: McGraw-Hill, 1992.

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Sidney, Mindess, a cura di. Fibre reinforced cementitious composites. London: Elsevier Applied Science, 1990.

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Sidney, Mindess, a cura di. Fibre reinforced cementitious composites. 2a ed. London: Taylor & Francis, 2007.

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Mechtcherine, Viktor, Volker Slowik e Petr Kabele, a cura di. Strain-Hardening Cement-Based Composites. Dordrecht: Springer Netherlands, 2018. http://dx.doi.org/10.1007/978-94-024-1194-2.

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Sadowski, Łukasz. Adhesion in Layered Cement Composites. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-03783-3.

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Brandt, A. M. Cement-based composites: Materials, mechanical properties and performance. London: Spon, 1995.

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Gao xing neng shui ni zhi bei he ying yong de ke xue ji chu: Gaoxingneng shuini zhibei he yingyong de kexue jichu. Beijing Shi: Hua xue gong ye chu ban she, 2008.

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Cement based composites: Materials, mechanical properties, and performance. 2a ed. London: Taylor & Francis, 2008.

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Makul, Natt. Principles of Cement and Concrete Composites. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69602-3.

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Cement-based composites: materials, mechanical properties and performance. London: Spon, 1995.

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Capitoli di libri sul tema "Cement composites"

1

Reales, Oscar Aurelio Mendoza, e Romildo Dias Toledo Filho. "Nanotube–Cement Composites". In Carbon Nanomaterials Sourcebook, 579–602. Boca Raton : Taylor & Francis Group, 2016. | “A CRC title.” |: CRC Press, 2018. http://dx.doi.org/10.1201/9781315371337-26.

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Gesser, H. D. "Cement, Ceramics, and Composites". In Applied Chemistry: A Textbook for Engineers and Technologists, 307–19. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-0531-0_16.

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Roussak, O. V., e H. D. Gesser. "Cement, Ceramics, and Composites". In Applied Chemistry, 291–301. Boston, MA: Springer US, 2012. http://dx.doi.org/10.1007/978-1-4614-4262-2_17.

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Gram, Hans-Erik, e Kerstin Olsson. "High Strength Cement Paste". In Brittle Matrix Composites 2, 403–11. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2544-1_42.

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Zohhadi, Nima, Nirupam Aich, Fabio Matta, Navid B. Saleh e Paul Ziehl. "Graphene Nanoreinforcement for Cement Composites". In Nanotechnology in Construction, 265–70. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17088-6_34.

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Hamelin, P., e P. Matray. "Mechanical Behaviour of Cement Based Composites". In Brittle Matrix Composites 3, 335–43. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3646-4_36.

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Shah, Surendra, e Yuan Gao. "Performance of Fiber Reinforced Materials: Historic Perspective and Glance in the Future". In Strain-Hardening Cement-Based Composites, 3–11. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1194-2_1.

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Ozu, Yuriko, Hiroshi Yamada, Akira Yasojima e Toshiyuki Kanakubo. "Evaluation of Shear and Tensile Bridging Characteristics of PVA Fibers Based on Bridging Law". In Strain-Hardening Cement-Based Composites, 88–96. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1194-2_10.

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Timothy, Jithender J., Tagir Iskhakov, Yijian Zhan e Günther Meschke. "A Multiscale Model for High Performance FRC". In Strain-Hardening Cement-Based Composites, 97–105. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1194-2_11.

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Abrishambaf, Amin, Mário Pimentel e Sandra Nunes. "Modelling and Experimental Characterization of the Tensile Response of Ultra-High Performance Fibre-Reinforced Cementitious Composites". In Strain-Hardening Cement-Based Composites, 106–14. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1194-2_12.

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Atti di convegni sul tema "Cement composites"

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Dinesh, A. "Development of Self-Sensing Cement Composite Using Nanomaterials for Structural Health Monitoring of Concrete Columns – A Comprehensive Review". In Sustainable Materials and Smart Practices. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901953-23.

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Abstract. Due to age, structural deterioration, and other factors, concrete constructions such as beams and columns will inevitably deteriorate. The growth of nanomaterials and recent advances in multidisciplinary research has broadened cement composites' applicability in various fields. A self-sensing cement composite can detect its own deformation, strain, and stress by changing its electrical characteristics, which may be measured with electrical resistivity. Carbon-based nanomaterials, such as carbon fiber, carbon black, and carbon nanotube, have a strong potential to increase cement composite's mechanical (strength) and electrical (resistivity, sensitivity) potentials due to their remarkable strength and conductivity. Due to the artificial integration of conductive carbon-based components will generate piezoresistive properties in typical cement composites, transforming them into self-sensing cement composites. As a result, the review focuses primarily on the development of nanoparticle-based self-sensing cement composites and their use in the health monitoring of structural columns. This research critically examines the materials used, fabrication techniques, strength, and sensing methodologies used to develop the self-sensing cement composite. The difficulties of commercializing self-sensing cement composites, as well as potential solutions, are also highlighted. According to the review, the difference in Poisson ratio and youngs modulus between the self-sensing cement composite and columns leads the self-sensing cement composite to have different strength and conductivity before and after embedding in columns. According to the study, the addition of conductive material diminishes the composite's workability due to its large specific surface area. Because of the well-distributed conductive network, the composite's resistivity is significantly lowered. The study also shows that the inclusion of a self-sensing cement composite has no bearing capacity influence on the column. Finally, according to the review, the self-sensing cement composite has the ability to monitor the health of structural columns.
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"Textile Fabrics for Cement Composites". In SP-206: Concrete: Material Science to Application - A Tribute to Surendra P. Shah. American Concrete Institute, 2002. http://dx.doi.org/10.14359/12262.

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"Durability of Fiber Cement Composites". In "SP-126: Durability of Concrete: Second International Conference, Montreal, Canada 1991". American Concrete Institute, 1991. http://dx.doi.org/10.14359/2370.

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Zhao, Ping, Sunjung Kim, Joel Braden, Conner Abens e Brian Hinderliter. "Properties of Cement-Sand Based Piezoelectric Composites". In ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7661.

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A novel cement-sand based piezoelectric smart composite was developed for structural health monitoring (SHM) in civil infrastructures. Most researches have focused on cement-based piezoelectric composites that are unrealistic in their applications due to their incompatibility with reinforced concrete with cement and sand. In this study, sand was applied to fabricate the composite to address the important issue. Two sets of specimens containing 30 vol% and 50 vol% lead zirconate titanate (PZT) were manufactured and their piezoelectric coefficient and dielectric constant were determined. The results showed that the piezoelectric effect and dielectric constant were enhanced with increasing PZT content. In addition, the sensing effect was conducted under compressive tests. The invesitigation demonstrated the feasibility of the new composite in its application to the SHM system.
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Moriconi, G. "Cement-based composites for structural use". In MATERIALS CHARACTERISATION 2009. Southampton, UK: WIT Press, 2009. http://dx.doi.org/10.2495/mc090401.

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Han, Baoguo, Xun Yu e Jinping Ou. "Dispersion of Carbon Nanotubes in Cement-Based Composites and Its Influence on the Piezoresistivities of Composites". In ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1318.

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Sodium dodecyl sulfate (SDS) and sodium dodecylbenzene sulfonate (NaDDBS) are used as surfactants to improve the dispersion of multi-walled carbon nanotubes (MWNTs) in cement mortar and fabricate piezoresistive carbon-nanotube/cement mortar composite. The piezoresistivity of carbon-nanotube/cement mortar composite with different content levels of MWNTs and different surfactants were explored under repeated loading and impulsive loading. Experimental results indicate that NaDDBS has higher efficiency than SDS for the dispersion of MWNTs in cement mortar. The response of the electrical resistance of carbon-nanotube/cement mortar composite with NaDDBS to external force is more stable and sensitive than that of carbon-nanotube/cement mortar composite with SDS. These findings indicate that the use of NaDDBS is an effective way for improving the dispersion of MWNTs in cement-based composite and fabricating MWNTs filled cement-based composite with stable and strong piezoresistive response.
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Vyšvařil, Martin, Tomáš Žižlavský e Pavla Rovnaníková. "Fresh state properties of spongilite blended cement pastes". In SPECIAL CONCRETE AND COMPOSITES 2020: 17th International Conference. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0041605.

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Němeček, Jiří, Pavel Trávníček, Vojtěch Pommer e Jiří Němeček. "Viscosimetry of cement pastes - Analytical and numerical solutions". In SPECIAL CONCRETE AND COMPOSITES 2020: 17th International Conference. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0042095.

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Machovec, Jan, Daniel Dobiáš e Pavel Reiterman. "Resistance of non-cement concrete to chloride ingress". In SPECIAL CONCRETE AND COMPOSITES 2019: 16th International Conference. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0000377.

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Smolakova, Michaela. "ANTIFUNGAL EFFICIENCY OF SLAG BASED CEMENT COMPOSITES". In 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/6.3/s26.004.

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Rapporti di organizzazioni sul tema "Cement composites"

1

Geleva, Elena, Nina Nikolova, Dimitar Tonev, Georgi Gyoshev, Aleksandar Nikolov, Hristo Protohristov e Stela Peneva. Immobilization of 3H on Cement-zeolite Composites. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, aprile 2019. http://dx.doi.org/10.7546/crabs.2019.04.04.

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Czarnecki, Lech, Andrzej Garbacz, Pawel Lukowski e James R. Clifton. Polymer composites for repairing of Portland cement concrete:. Gaithersburg, MD: National Institute of Standards and Technology, 1999. http://dx.doi.org/10.6028/nist.ir.6394.

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Sugama, Toshifumi. Alkali-Activated Cement Composites for High Temperature Goethermal Wells. Office of Scientific and Technical Information (OSTI), dicembre 2018. http://dx.doi.org/10.2172/1501578.

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Li, Victor C., e Yin-Wen Chan. Mechanical Interaction Between Synthetic Fiber and Cement Base Matrix in FRC Composites. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1993. http://dx.doi.org/10.21236/ada265310.

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Sugama, Toshifumi, e Tatiana Pyatina. Self-Healing, Re-adhering, and Corrosion-Mitigating Inorganic Cement Composites for Geothermal Wells at 270°-300°C: Final Report. Office of Scientific and Technical Information (OSTI), febbraio 2019. http://dx.doi.org/10.2172/1501577.

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Young, J. F., e R. L. Berger. Cement Paste Matrix Composite Materials Center. Fort Belvoir, VA: Defense Technical Information Center, ottobre 1987. http://dx.doi.org/10.21236/ada188657.

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SUGAMA, T. RECYCLED WASTE-BASED CEMENT COMPOSITE PATCH MATERIALS FOR RAPID/PERMANENT ROAD RESTORATION. Office of Scientific and Technical Information (OSTI), luglio 2001. http://dx.doi.org/10.2172/15011144.

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Thompson, Marshall, e Ramez Hajj. Flexible Pavement Recycling Techniques: A Summary of Activities. Illinois Center for Transportation, luglio 2021. http://dx.doi.org/10.36501/0197-9191/21-022.

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Cold in-place recycling (CIR) involves the recycling of the asphalt portions (including hot-mix asphalt and chip, slurry, and cape seals, as well as others) of a flexible or composite pavement with asphalt emulsion or foamed asphalt as the binding agent. Full-depth reclamation (FDR) includes the recycling of the entire depth of the pavement and, in some cases, a portion of the subgrade with asphalt, cement, or lime products as binding agents. Both processes are extensively utilized in Illinois. This project reviewed CIR and FDR projects identified by the Illinois Department of Transportation (IDOT) from the Transportation Bulletin and provided comments on pavement designs and special provisions. The researchers evaluated the performance of existing CIR/FDR projects through pavement condition surveys and analysis of falling weight deflectometer data collected by IDOT. They also reviewed CIR/FDR literature and updated/modified (as appropriate) previously provided inputs concerning mix design, testing procedures, thickness design, construction, and performance as well as cold central plant recycling (CCPR) literature related to design and construction. The team monitored the performance of test sections at the National Center for Asphalt Technology and Virginia Department of Transportation. The researchers assisted IDOT in the development of a CCPR special provision as well as responded to IDOT inquiries and questions concerning issues related to CIR, FDR, and CCPR. They attended meetings of IDOT’s FDR with the Cement Working Group and provided input in the development of a special provision for FDR with cement. The project’s activities confirmed that CIR, FDR, and CCPR techniques are successfully utilized in Illinois. Recommendations for improving the above-discussed techniques are provided.
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