研究了铝酸盐水泥(CAC)基材料在软水环境中的力学性能变化及温度对其影响的机理. 监测CAC砂浆抗压强度的同时，通过XRD、TG、EDTA滴定和SEM等方法分析净浆物相组成和微观结构的演变规律. 结果表明：在20℃软水环境中，CAC水化产物组成并未发生明显改变，且AH3凝胶的形成保证了材料长期性能的稳定. 而在60℃环境中，温度升高导致物相转变，软水的存在进一步增强了这一效应. 在温度和软水的共同影响下，产物相变以及部分产物的溶解均导致CAC浆体微结构遭到破坏，从而引起材料性能的降低.

In this paper, the mechanical property changes of calcium aluminate cement (CAC)-based materials in soft water environments and the mechanisms influenced by temperature were studied. The compressive strength of CAC mortar was monitored, the phase composition and microstructure of the paste specimens were analysed by XRD, TG, EDTA titration and SEM. Results show that, the composition of CAC hydration products did not change significantly in 20℃ soft water environment, and the formation of a large number of amorphous phase AH3 in the paste ensured the stability of the long-term performance of the material. In the 60℃ environment, an increase in temperature triggers phase transitions, and the presence of soft water further enhanced this effect. Under the combined influence of temperature and soft water, the transformation of the crystal products and dissolution of some phases lead to disruption of the CAC paste microstructure and pore creation, resulting in degraded material properties.

TU528

热—压—流耦合作用下球墨铸铁管内衬水泥砂浆的失效机理及寿命评估(52378242)