温度及软水环境对铝酸盐水泥基材料的影响

Effect of Temperature and Soft Water Environment on Aluminate Cement Based Materials

摘要:

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X射线衍射、热重分析、乙二胺四乙酸（EDTA）滴定和扫描电镜等分析了CAC净浆的物相组成和微观结构。结果表明：在20 ℃软水环境中，CAC水化产物的组成并未发生明显改变，且三水铝石凝胶的形成保证了材料长期性能的稳定；在60 ℃软水环境中，温度升高导致CAC水化产物的物相发生转变，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，水化产物的相变及部分水化产物的溶解均破坏了CAC净浆的微观结构，降低了材料的性能。

Abstract:

The mechanical property changes of aluminate cement（CAC） based materials in soft water environments and the mechanisms influenced by temperature were studied. Compressive strength of CAC mortar was monitored， the phase composition and microstructure of the paste specimens were analyzed by X-ray diffractometer， thermogravimetry analysis， ethylene diamine tetraacetic acid（EDTA） titration and scanning electronic microscope. The results show that the composition of CAC hydration products do not change significantly in 20 ℃ soft water environment， and the formation of a large number of amorphous phase gibbsite in the paste ensures 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 enhances 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.