<br>改善水泥基材料在高温下的机械性能：降低 C3S/C2S 比值,Construction and Building Materials

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改善水泥基材料在高温下的机械性能：降低 C3S/C2S 比值
Construction and Building Materials ( IF 7.4 ) Pub Date : 2024-03-08 , DOI: 10.1016/j.conbuildmat.2024.135741
Tingcong Wei , Jianzhuang Xiao , Xiaowei Cheng , Peng Gong , Kaiyuan Mei , Zhengmeng Hou , Xuning Wu

针对水泥石材在高温下强度下降的现象，提出了一种增强其力学性能的新方法：通过降低水泥中的C3S/C2S比值来抢占先人地降低CaO/SiO2比值，然后用适量的硅微粉进行加固。为了验证这种新方法的可靠性，通过维氏硬度、BJH、XRD、TGA和SEM-EDS研究了C3S-C2S体系在230 °C和20.7 MPa下的水化特性。结果显示 C3S/C2S 比值发生变化时没有出现新的物理相。增加 C2S 的含量促进了额外的 xonotlite 的形成。当 C3S：C2S 比例为 1：1 时，C3S-C2S 体系的最佳维氏硬度为 27.69 MPa。当复合水泥中 C3S：C2S 比约为 1.07：1 时，由 G 级油井水泥和低温水泥组成的复合水泥的抗压强度提高了 5–10 MPa。C3S-C2S体系和复合水泥均表明，其力学性能随着C2S含量的增加而增加。预测表明，新型低钙耐高温水泥的最佳 C3S：C2S 比例为 1：1。这种新方法的未来应用有望节省材料成本并减少水泥生产中的碳排放。

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Improving the mechanical properties of cement-based materials under high temperature: Reducing the C3S/C2S ratio

Aiming at the phenomenon of strength decline of cement stone at high temperatures, a new method was proposed to enhance its mechanical properties: the CaO/SiO2 ratio was pre-emptively reduced by decreasing the C3S/C2S ratio in the cement, which was then reinforced with an appropriate amount of silica powder. To verify the reliability of this new method, the hydration characteristics of the C3S-C2S system at 230 °C and 20.7 MPa were investigated via Vickers hardness, BJH, XRD, TGA, and SEM-EDS. Results showed no emergence of new physical phases with changes in the C3S/C2S ratio. Increasing the content of C2S facilitated the formation of additional xonotlite. Optimal Vickers hardness of the C3S-C2S system was attained at 27.69 MPa when the C3S:C2S ratio was 1:1. The compressive strength of compound cement, comprising G-class oil-well cement and low-heat cement, increased by 5–10 MPa when the C3S:C2S ratio in the compound cement was approximately 1.07:1. Both the C3S-C2S system and compound cement showed that their mechanical properties increased with increasing C2S content. Predictions suggest an optimal C3S:C2S ratio of 1:1 for the new low-calcium high-temperature-resistant cement. The future application of this new method promises material cost savings and reduced carbon emissions from cement production.

更新日期：2024-03-08

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