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Добірка наукової літератури з теми "Cements containing materials-Carbonation"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Cements containing materials-Carbonation"

Balestra, Carlos Eduardo Tino, Gustavo Savaris, Alberto Yoshihiro Nakano, and Ricardo Schneider. "Carbonation of concretes containing LC³ cements with different supplementary materials." Semina: Ciências Exatas e Tecnológicas 43, no. 2 (December 27, 2022): 161–70. http://dx.doi.org/10.5433/1679-0375.2022v43n2p161.

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Due to the clinkerization process during the Portland cement production, large amounts of CO2 are emitted, increasing the effects related to climate change (approximately 5-10% of global CO2 emissions come from cement production), consequently, the seek for alternatives to mitigate these high emissions are necessary. The use of supplementary cementitious materials (SCM) to partial replace of Portand clinker/cement has been the subject of different research, including the use of LC3 cements (Limestone Calcined Clay Cements), where up to 50% of Portland clinker can be replaced, however, cement industry has already used othersupplementary cementitious materials with pozzolanic activities in commercial cements. In this sense, this work evaluates the performance of concretes containing LC3 mixtures with the presence of different SCM (silica fume, fly ash, sugarcane bagasse ash and açaí stone ash) regarding durability issues by carbonation. The results showed that all concretes with LC3 presented higher carbonation fronts in relation to the reference concrete, with Portland cement, due to the lower availability of calcium to react with the CO2 that penetrates into the concrete pores, so the adoption of curing procedures and coatings are recommended.

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Rita Damasceno Costa, Ana, and Jardel Pereira Gonçalves. "Accelerated carbonation of ternary cements containing waste materials." Construction and Building Materials 302 (October 2021): 124159. http://dx.doi.org/10.1016/j.conbuildmat.2021.124159.

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Shah, Vineet, and Shashank Bishnoi. "Carbonation resistance of cements containing supplementary cementitious materials and its relation to various parameters of concrete." Construction and Building Materials 178 (July 2018): 219–32. http://dx.doi.org/10.1016/j.conbuildmat.2018.05.162.

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Cornejo, M. H., J. Elsen, C. Paredes, and H. Baykara. "Hydration and strength evolution of air-cured zeolite-rich tuffs and siltstone blended cement pastes at low water-to-binder ratio." Clay Minerals 50, no. 1 (March 2015): 133–52. http://dx.doi.org/10.1180/claymin.2015.050.1.12.

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AbstractThis contribution is the second part of an in-depth study on the hydration and strength evolution of blended cement pastes at a water to binder (W/B) ratio of 0.3, cured by two different methods. The blended cement pastes showed significant hydration up to 7 days, when almost all of the hydration products had already formed; thereafter, carbonation played an important role up to, and possibly beyond, 91 days. Likewise, the hydration of alite (tricalcium silicate, Ca3SiO5, C3S) proceeded up to 14 days and then started to slow down. However, the hydration of belite (dicalcium silicate, Ca2SiO4, C2S) was affected most strongly, as it nearly ceased, under the air-curing conditions. During hydration, some of the blended cement pastes had a larger calcium hydroxide (CH) content than the unblended (plain) ones. The accelerating effects of the addition of supplementary cementitious materials (SCMs), the air-curing conditions and the low W/B ratio may explain these unusual results. Under these experimental conditions, the water incorporated into hydrates was about 50% of the total amount of water used during full hydration of the cement pastes. The pozzolanic reaction predominated during the early ages, but disappeared as time passed. In contrast, the carbonation reaction increased by consuming ∼45% of the total amount of CH produced after aging for 91 days. Only one blended cement paste reached the compressive strength of the plain cements. The blended cement pastes containing 5% of the zeolitic tuffs, Zeo1 or Zeo2, or 10% of the calcareous siltstone, Limo, developed the greatest compressive strength under the experimental conditions used in this study.

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Homayoonmehr, Reza, Ali Akbar Ramezanianpour, Faramarz Moodi, Amir Mohammad Ramezanianpour, and Juan Pablo Gevaudan. "A Review on the Effect of Metakaolin on the Chloride Binding of Concrete, Mortar, and Paste Specimens." Sustainability 14, no. 22 (November 14, 2022): 15022. http://dx.doi.org/10.3390/su142215022.

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Chloride binding is a complex phenomenon in which the chloride ions bind with hydrated Portland cement (PC) phases via physical and chemical mechanisms. However, the current utilization of clays as (Al)-rich supplementary cementitious materials (SCMs), such as metakaolin (MK), can affect the chloride-binding capacity of these concrete materials. This state-of-the-art review discusses the effect of clay-based SCMs on physical and chemical chloride binding with an emphasis on MK as a high-reactivity clay-based SCM. Furthermore, the potential mechanisms playing a role in physical and chemical binding and the MK effect on the hydrated cement products before and after exposure to chloride ions are discussed. Recent findings have portrayed competing properties of how MK limits the physical chloride-binding capacity of MK-supplemented concrete. The use of MK has been found to increase the calcium silicate hydrates (CSH) content and its aluminum to silicon (Al/Si) ratio, but to reduce the calcium to silicon (Ca/Si) ratio, which reduces the physical chloride-binding capacity of PC-clay blended cements, such as limestone calcined clay cements (LC3). By contrast, the influence of MK on the chemical chloride capacity is significant since it increases the formation of Friedel’s salt due to an increased concentration of Al during the hydration of Portland cement grains. Recent research has found an optimum aluminum to calcium (Al/Ca) ratio range, of approximately 3 to 7, for maximizing the chemical binding of chlorides. This literature review highlights the optimal Al content for maximizing chloride binding, which reveals a theoretical limit for calcined clay addition to supplementary cementitious materials and LC3 formulations. Results show that 5–25% of replacements increase bound chloride; however, with a higher percentage of replacements, fresh and hardened state properties play a more pivotal role. Lastly, the practical application of four binding isotherms is discussed with the Freundlich isotherm found to be the most accurate in predicting the correlation between free and bound chlorides. This review discusses the effects of important cement chemistry parameters, such as cation type, sulfate presence, carbonation, chloride concentration, temperature, and applied electrical fields on the chloride binding of MK-containing concretes—important for the durable formulation of LC3.

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Li, Haoyuan, Zhonghe Shui, Ziyan Wang, and Xunguang Xiao. "Effects of UV Radiation on the Carbonation of Cement-Based Materials with Supplementary Cementitious Materials." Coatings 13, no. 6 (May 26, 2023): 994. http://dx.doi.org/10.3390/coatings13060994.

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Solar light with high-energy ultraviolet (UV) radiation acting on the surface of cement-based materials easily changes the properties of cement-based materials by affecting their carbonation reaction. In order to elucidate the difference in the carbonation process under UV radiation in cement-based materials with different supplementary cementitious materials (SCMs), the carbonation depth (apparent pH values), chemical composition (XRD, FTIR, and TG analysis), and mechanical properties (compressive strength and microhardness) of cement-based materials were evaluated. The results revealed that UV radiation acting on the surface of cement-based materials accelerated the carbonation reaction, which enhanced the decrease rate of pH and formation of stable calcite, thereby improving the macromechanical and micromechanical properties of cement-based materials. In addition, the carbonation process under UV radiation differs according to the added SCM. In particular, silica fume substantially increased the carbonation of cement-based materials under UV radiation, resulting in a 53.3% increase in calcium carbonate coverage, a 10.0% increase in compressive strength, and a 20.9% increase in mean microhardness, whereas the incorporation of blast furnace slag resulted in a smaller effect on UV irradiation-induced carbonation. In addition, UV radiation facilitates the crystallographic transformation process of cement-based materials containing metakaolin, resulting in more stable crystals of carbonation products. This study provides a theoretical framework and serves as an important reference for the design of cement-based materials under strong UV radiation for practical engineering applications.

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Pokorný, Jaroslav, Milena Pavlíková, and Zbyšek Pavlík. "Effect of CO₂ Exposure on Mechanical Resistivity of Cement Pastes with Incorporated Ceramic Waste Powder." Materials Science Forum 824 (July 2015): 133–37. http://dx.doi.org/10.4028/www.scientific.net/msf.824.133.

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Carbonation is chemical process associated with CO2penetration into the material porous structure causing subsequent chemical changes in the structure of cement pastes. In this work, carbonation of several pastes containing varying amount of cement replacement by three waste ceramic powders is studied. Chemical composition of particular tested materials is accessed using XRF analysis. Matrix density, bulk density, total open porosity, compressive and bending strength are measured for all developed pastes with incorporated ceramic materials. Simultaneously, the effect of carbonation on these material properties is researched. The obtained results show significant improvement of materials mechanical strength due to the carbonation. Here, the measured compressive strength is typically about ~ 60% higher for materials exposed to CO2rich environment compared to the materials cured in laboratory conditions.

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STAŃCZYK, DOMINIKA, and BEATA JAWORSKA. "INFLUENCE OF AGRICULTURAL BIOMASS FLY ASH CEMENT SUBSTITUTION ON THE CARBONATION OF CEMENT AND POLYMER-CEMENT COMPOSITES." Structure and Environment 12, no. 2 (June 30, 2020): 66–71. http://dx.doi.org/10.30540/sae-2020-007.

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Practical use of a new type of combustion waste such as an agricultural biomass fly ash in the building materials requires an assessment of its performance. The paper presents the investigation results on the influence of cement substitution (5% and 30%) by this ash on the cement and polymer-cement composites resistance to carbonation. The composites resistance was assessed on the basis of carbonation process over time (up to 360 days) using the phenolphthalein method. It was found that fly ash from agricultural biomass increases the susceptibility to carbonation of polymer-cement composites to a lesser extent than cement composites compared to composites containing siliceous coal fly ash.

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Kim, Min-Sung, Sang-Rak Sim, and Dong-Woo Ryu. "Supercritical CO2 Curing of Resource-Recycling Secondary Cement Products Containing Concrete Sludge Waste as Main Materials." Materials 15, no. 13 (June 29, 2022): 4581. http://dx.doi.org/10.3390/ma15134581.

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This study aims to develop highly durable, mineral carbonation-based, resource-recycling, secondary cement products based on supercritical carbon dioxide (CO2) curing as part of carbon capture utilization technology that permanently fixes captured CO2. To investigate the basic characteristics of secondary cement products containing concrete sludge waste (CSW) as the main materials after supercritical CO2 curing, the compressive strengths of the paste and mortar (fabricated by using CSW as the main binder), ordinary Portland cement, blast furnace slag powder, and fly ash as admixtures were evaluated to derive the optimal mixture for secondary products. The carbonation curing method that can promote the surface densification (intensive CaCO3 formation) of the hardened body within a short period of time using supercritical CO2 curing was defined as “Lean Carbonation.” The optimal curing conditions were derived by evaluating the compressive strength and durability improvement effects of applying Lean Carbonation to secondary product specimens. As a result of the experiment, for specimens subjected to Lean Carbonation, compressive strength increased by up to 12%, and the carbonation penetration resistance also increased by more than 50%. The optimal conditions for Lean Carbonation used to improve compressive strength and durability were found to be 35 °C, 80 bar, and 1 min.

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Hussin, Muhamad Hasif, Nor Hazurina Othman, and Mohd Haziman Wan Ibrahim. "Carbonation of concrete containing mussel (Perna viridis) shell ash." Journal of Engineering, Design and Technology 17, no. 5 (August 10, 2019): 904–28. http://dx.doi.org/10.1108/jedt-12-2018-0228.

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Purpose This paper aims to investigate the use of calcined mussel shell (CMS) ash–cement mix in concrete that is found to increase the concrete resistance against carbonation. Design/methodology/approach The deposited ash from the calcination of the mussel shells at 1000°C was used to replace the ordinary Portland cement at 5 and 7 per cent of the cement weight. The test results from the control concrete specimens were compared to the test results from the experimental concrete specimens to analyse the effects due to the said replacements. Carbonation was carried out naturally in the environment where the concentration of the carbon dioxide gas was at 0.03 per cent, the relative humidity of 65 per cent and the temperature of 27°C for a maximum period of 120 days. Measurement of carbonation depth was taken in accordance to the BS EN 13295: 2004. The carbonation resistance of the concrete was assessed based on the degree of compliance with the common design life requirement of 50 years. The filler effect from the CMS was verified using the capillary absorption test (ASTM C1585: 2013) and the electron microscope. Findings Experimental concrete specimens containing 5 and 7 per cent of the CMS ash demonstrated better carbonation resistance compared to the control concrete specimens with a minimum attainable design life of 56 years which can reach a maximum of 62 years. Capillary absorption test results indicated that the concrete pores have been effected by the said filler effect and visual observation from the electron microscope confirmed, solidifying the statement. Originality/value The CMS ash is proven to contribute to the concrete’s resistance against carbonation. Also, the CMS ash is synthesized from waste materials which have contributed to the application of the green material in the concrete technology.

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Більше джерел

Дисертації з теми "Cements containing materials-Carbonation"

Shah, Vineet Pawan. "Carbonation of concrete containing supplementary cementitious materials." Thesis, 2018. http://eprint.iitd.ac.in:80//handle/2074/7950.

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Тези доповідей конференцій з теми "Cements containing materials-Carbonation"

Adjei, Stephen, Salaheldin Elkatatny, Wilberforce Nkrumah Aggrey, and Yasmin Abdelraouf. "Extended Abstract: The Feasibility of Using Geopolymer in Oil-Well Cementing: A Review." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22130-ms.

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Abstract Over the years, various cementitious materials have been investigated as a substitute for conventional cement. One example of these materials is geopolymer, a binder developed when an alkaline solution is used to activate materials containing alumina and silica. The use of this material is well established in the construction industry. In oil-well cementing, its feasibility is currently being investigated. An extensive survey on the various geopolymer studies has been conducted. The goal is to present a manuscript containing a summary of these studies. This will help researchers merge the knowledge acquired going forward. The study showed that the application of geopolymer in acidic and saline conditions, and in well plugging and abandonment operations. Additionally, geopolymer-mud compatibility and the impact of temperature on geopolymer systems have also been studied. In general, geopolymer systems show better performance, overcoming the limitations of the OPC systems. For instance, the geopolymer is more suited for CO2 sequestrations wells as it does not undergo a carbonation reaction which would result in degradation. Furthermore, geopolymers have superior performance in highly saline conditions and besides their compatibility with mud, a geopolymer-mud combination produces cementitious systems with enhanced properties.

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