Analysis of Durability and Hydration Characteristics of Metakaolin Concrete
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摘要:
为了得到不同偏高岭土掺量对混凝土物理、力学性能和水化特性的影响，开展了偏高岭土混凝土的基本物理力学实验和混凝土的水化性能实验。结果表明：适当掺加偏高岭土来代替混凝土水泥掺料，可以较好地提升混凝土的力学性能和工作性能。但是随着偏高岭土掺量的不断增大，混凝土内部的水泥含量会减少以及混凝土内部的化学结合水量减少。使得其水化放热量和放热速率均减小以及水化反应生成的氢氧化钙含量减少。通过结合偏高岭土水化后XRD图谱分析可知，在偏高岭土掺量为15%时钙矾石XRD图谱峰值最显著。这和前期得到混凝土力学性能达到较佳的偏高岭土掺量一致。
Abstract:In order to obtain the effects of different amounts of metakaolin on the physical, mechanical properties and hydration characteristics of concrete, basic physical and mechanical tests of metakaolin concrete and concrete hydration performance tests were carried out. The results show that the proper addition of metakaolin instead of concrete cement admixture can better improve the mechanical properties and working performance of concrete. However, with the increasing content of metakaolin, the cement content inside the concrete will decrease and the chemically bound water inside the concrete will decrease. So that the heat and rate of hydration are reduced, and the content of calcium hydroxide generated by the hydration reaction is reduced. By combining the XRD pattern analysis of metakaolin after hydration, it can be known that the peak value of the XRD pattern of ettringite is the most significant when the content of metakaolin is 15%. This is consistent with the content of metakaolin that is obtained in the early stage to achieve the best mechanical properties of concrete.
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Key words:
- Chemically bound water /
- Hydration product /
- Hydration heat release rate /
- Heat release /
- XRD pattern
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表 1 高岭土的化学成分/%
Table 1. Chemical composition and proportion of kaolin
SiO2 Al2O3 Fe2O3 CaO K2O 其他 56.38 36.84 2.36 2.12 0.62 1.68 
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