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Li, Mingqi (author), Chen, Huisu (author), Lin, Jianjun (author)
Porous networks provide the main transport channels to the active media, which will damage the microstructure and then lead to a subsequent reduction in the strength, serviceability and aesthetic of porous materials. The connectivity of the porous network plays an essential role in the transport properties of these active media. In statistic...
conference paper 2021
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Nie, Ding (author), Shang, Feng (author), Han, Xun (author)
Concrete dams are subjected to soft water penetration of a high water head during their long service lives. Degradation due to calcium leaching will decrease the durability of the concrete and affect dam safety. The long-term performance of concrete dams due to calcium leaching should be evaluated and predicted accurately to complete the...
conference paper 2021
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Nandhini, K. (author), Ponmalar, V. (author)
The colossal magnification of industrialization in recent years led to the snags of squandering materials that harm the environment. To employ the industrial debris into the concrete, can contribute to lower the carbon footprint to some extent. For this purpose, the M60 grade of self-compacting concrete was designed with industrial waste...
conference paper 2021
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Zhao, Lixiao (author), Feng, Pan (author)
Chloride diffusion in concrete is one of the key parameters of durability design for structure. Existing methods of reducing the chloride diffusion such as decreasing water-cement ratio and adding mineral admixtures often lead to increase the risk of concrete cracking. In this study, we focused on mitigating the permeation of chloride ions in...
conference paper 2021
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Shenbagam, Vaishnav Kumar (author), Cepuritis, Rolands (author), Chaunsali, Piyush (author)
Calcium sulfoaluminate (CSA) cements are widely being promoted as alternative low CO2 binders. CSA cements can also be expansive and designed to be shrinkage-compensating. The main phase of CSA cement is ye’elimite, which hydrates in the presence of calcium sulfate to form ettringite as the main hydration product. The availability of calcium...
conference paper 2021
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Andrade, C. (author), Coppens, E. (author)
In Belgium the construction of a repository for low and intermediate short living radioactive waste is in preparation. The safety is, among other aspects, based on engineered barriers of cementitious materials preventing release of radionuclides to the atmosphere or to the surrounding soil. Relatively low water infiltration through these...
conference paper 2021
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Wang, XiaoX (author), Liu, JiaP (author), Zhong, PeiH (author)
When the corrosion expansion stress of the steel reinforcement exceeds the ultimate tensile strength of the concrete, the concrete will crack and eventually cause structural damage. Therefore, direct characterization methods of steel corrosion expansion stress can help predict the concrete cracking time, prevent corrosion expansion and repair...
conference paper 2021
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Ni, Chenxin (author), Yu, Zhuqing (author), Shen, Xiaodong (author)
As one of the mineral admixtures, silica fume (SF) with high pozzolanic reactivity is generally used to improve the properties of concrete. Most commercial silica fume used in concrete project is dry densified silica fume (DSF). It consists of a good deal of agglomerates of sizes ranging from 10 μm to several millimeters. The size of the...
conference paper 2021
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Sun, Yubo (author), Chen, Boyu (author), Zhang, Shizhe (author), Blom, Kees (author), Luković, Mladena (author), Ye, Guang (author)
In recent years, the rapid industrialization and urbanization led to the explosive growth of municipal solid waste incineration (MSWI) bottom ashes (BA) production. However, most of them are directly landfilled, which not only brings environmental burden but also results in loss of potential resources. Present researches have proved that MSWI BA...
conference paper 2021
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Antonova, Anna (author), Eik, Marika (author), Jokinen, Ville (author), Punkki, Jouni (author), Puttonen, Jari (author)
The performance of fibre reinforced cementitious composites depends on the interaction between the cementitious matrix and the fibres on the micro-scale. This interaction is affected by the material and surface properties of the fibre and the micro-scale characteristics of the cementitious matrix close to the fibre surface, creating the...
conference paper 2021
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Cao, Yuanzhang (author), Guo, Liping (author)
The chloride and sulfate exist together in real environment, no matter marine or salts lakes, and the ratio of the chloride to sulfate is varied. To precisely predict the concrete durability under real environment, this paper mainly investigated the influence of sulfate on chloride ions diffuse into hardened cement paste. The Minitab software...
conference paper 2021
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Yang, Sha (author), Ballschmiede, Conrad (author), Gilka-Bötzow, Albrecht (author), Koenders, Eduardus A.B. (author)
Low density load bearing structural concrete members with improved thermal insulation properties, composed of lightweight aggregate (LWA) and foam concrete is investigated, which expands the application range of lightweight structural materials. This study aims to characterize a lightweight aggregate concrete with a foamed cementitious matrix ...
conference paper 2021
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Zhao, Shengying (author), Guan, Xinchun (author), Qiao, Guofu (author)
Superabsorbent polymer (SAP) can modify the microstructure and influence the mechanical properties of cement paste in at least two ways: while cavities left by SAP increase the total porosity, water released by SAP affects the hydration degree of the surrounding paste. As a starting point for investigation into the overall effect, this study...
conference paper 2021
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Mutti, Marcello (author), Joseph, Shiju (author), Cizer, Özlem (author)
The mix design of alkali-activated materials (AAMs) is developed by taking into account several interdependent parameters. Therefore, the optimization of these to achieve a robust composition might represent a great challenge. The aim of this study is to investigate and compare the influence of some key parameters on the reactivity and setting...
conference paper 2021
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Tambara Jr, L.U.D. (author), Rocha, J.C. (author), Cheriaf, M. (author), Palomo, A. (author), Fernández-Jiménez, A. (author)
The effect of including 5 % chloride salts (NaCl and CaCl2) on calcium sulfoaluminate cement hydration was studied. The rate of heat release, setting times and mechanical strength were determined in 2 d, 28 d and 90 d cement pastes. The hydration products formed at those ages were identified with XRD and SEM. Hydration reactions were hastened...
conference paper 2021
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Antony, J. (author), Al-Bahar, S. (author), Jayasree, C. (author), Al-Arbeed, A. (author), Behbehani, Muntaha H. (author), Rasheed, Zakiah A. (author)
Volcanic ash blended cement based concrete are known for its better performance in terms of strength and durability, especially in marine environments where hot and cold climatic conditions along with chloride and sulphate attacks are detrimental for the construction materials. Since the properties of volcanic ash will vary with region to region...
conference paper 2021
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Kunz, Philipp (author), Mechtcherine, Viktor (author)
Strain-hardening cement-based composites (SHCC) are high-performance fiber-reinforced composites with promising durability properties due to their considerably enhanced crack control under tensile load conditions. The knowledge of the transport properties of such composites in cracked state are crucial for estimating their durability...
conference paper 2021
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FRASSON, Bruna J. (author), CHERIAF, Malik (author), ROCHA, Janaíde C. (author)
Addition of Portland cement in low-calcium aluminosilicate-based alkali-activated materials can provide rapid hardening at room temperature, thus modifying microstructure and mechanical properties. In the present study, the effect of Portland cement addition on alkali-activated materials, cured at room temperature, was analysed by mechanical...
conference paper 2021
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Pel, L. (author), Ji, Yanliang (author), Sun, Zhenping (author)
With freshwater getting scares seawater, i.e., water containing NaCl, can become the only viable option for making concrete. Although a lot of research had been directed to understanding the role of water in cement hydration, not much is known about the interaction of the Na+ and Cl- with cement paste during drying. A problem is that available...
conference paper 2021
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Wang, Yi (author), Zhang, Mingzhong (author)
Strain hardening geopolymer composites (SHGC) as a tailored group of fibre reinforced geopolymer composites are featured by large tensile strain capacity with multiple micro-cracks. This paper experimentally investigates the strain hardening behaviour of SHGC in terms of flexural stress-deflection response, failure mode and cracking, flexural...
conference paper 2021
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