Early-age shrinkage behavior of cement mixtures regulated with metakaolin-based internal conditioning

IF 5.3 2区 地球科学 Q2 CHEMISTRY, PHYSICAL Applied Clay Science Pub Date : 2024-10-03 DOI:10.1016/j.clay.2024.107583
Dayou Luo, Jianqiang Wei
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Abstract

Shrinkage occurs in concrete during its hardening and strength gain process leading to undesired deformation, cracking, and decreases in strength and durability. While metakaolin-based internal conditioning (MIC) has been validated as a promising technique for modifying cement and mitigating alkali-silica reactions in concrete, its impact on the early-age shrinkage behavior of cement remains unexplored. This study delves into the effects of MIC and its coupling with lithium on the chemical shrinkage, autogenous shrinkage, and drying shrinkage of portalnd cement incorporating 30 % metakaolin with varying degrees of saturation (50 %, 75 %, and 100 %). The results indicate that the hydration of cement can be substantially enhanced by MIC with 29.0 % more heat released and a 32.3 % decrease in calcium hydroxide content. As a result of the enhanced hydration, cement with MIC yielded increased chemical shrinkage. Compared with dry MK, the autogenous shrinkage and drying shrinkage of cement were decreased by 38.0 % and 11.0 %, respectively, in the presence of MIC. A synergistic effect between MIC and lithium was suggested by the higher efficacy in suppressing autogenous shrinkage.
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用偏高岭土内调节剂调节水泥混合物的早龄收缩行为
混凝土在硬化和强度增加的过程中会产生收缩,从而导致不必要的变形、开裂以及强度和耐久性下降。虽然偏高岭土基内部调节(MIC)已被证实是改性水泥和减轻混凝土中碱-硅反应的有效技术,但其对水泥早期龄期收缩行为的影响仍有待探索。本研究深入探讨了 MIC 及其与锂的耦合作用对掺入 30%偏高岭土且饱和度不同(50%、75% 和 100%)的 portalnd 水泥的化学收缩、自生收缩和干燥收缩的影响。结果表明,MIC 能显著提高水泥的水化效果,放出的热量增加 29.0%,氢氧化钙含量减少 32.3%。由于水化作用增强,添加了 MIC 的水泥的化学收缩率也随之增加。与干燥的 MK 相比,在 MIC 的作用下,水泥的自生收缩率和干燥收缩率分别降低了 38.0 % 和 11.0 %。MIC 和锂的协同效应被认为在抑制自生收缩方面具有更高的功效。
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来源期刊
Applied Clay Science
Applied Clay Science 地学-矿物学
CiteScore
10.30
自引率
10.70%
发文量
289
审稿时长
39 days
期刊介绍: Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...
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