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硫铝酸盐基复合胶凝体系水化性能的温度敏感性
作者:徐玲琳 范胜华 张国防 王培铭 
单位:先进土木工程材料教育部重点实验室 同济大学 上海201804 
关键词:混合水泥 硫铝酸盐水泥 无水石膏 温度 性能 
分类号:TQ172.75
出版年,卷(期):页码:2017,45(11):0-0
DOI:
摘要:

 研究了5、20 ℃和40 ℃硫铝酸盐水泥熟料-硅酸盐水泥-无水石膏三元体系(简称三元体系)的初凝时间、抗压强度及水化产物组成。结果表明:源自水化产物的显著差异,所涉硫铝酸盐水泥熟料为主的复合胶凝体系的性能对养护温度的敏感程度直接取决于初始配合比。与纯硫铝酸盐水泥熟料相比,单掺硅酸盐水泥时水化产物由钙矾石变为水化钙铝黄长石,导致硬化浆体力学强度显著降低。而单掺无水石膏或复掺无水石膏和硅酸盐水泥时,石膏的掺入促进了钙矾石的生成,有效抑制了向单硫型水化硫铝酸钙的转变(尤其在高温下),使得高温下的抗压强度略有提升。此外,欲使三元体系在不同养护温度下的初凝时间变化不大,硅酸盐水泥的掺量需控制在30%以上;要使抗压强度变化不大,石膏掺量宜在25%以上。

 The initial setting time, compressive strength development and phase composition of calcium sulfoaluminate (CSA) clinker-Portland cement-anhydrite ternary system (abbreviation: ternary system) at different temperatures (i.e., 5℃, 20℃ and 40℃)

were investigated. The results indicate that the temperature sensitivity of the hydration properties of calcium sulfoaluminate cement based blends depends on the mix proportions, which results from the prominent difference in hydration products. Compared to neat CSA clinker, the addition of Portland cement enables the main hydrates switching from ettringite to strätlingite, resulting in a decrease of 3-d compressive strength. The addition of anhydrite or together with Portland cement promotes the formation of ettringite, and thus prohibits the conversion to monosulfate (especially at an elevate temperature), leading to a higher compressive strength at an elevate temperature. In addition, the dosage of Portland cement in ternary system should exceed 30% to obtain stable initial setting time at nevertheless low (5℃) or elevate temperature (40℃). The amount of anhydrite should be greater than 25% to achieve the comparatively similar 3-d and 28-d compressive strength.
基金项目:
国家自然科学基金(51402216);国家重点研发计划项目(2016YFC0700905);中德科学中心项目(GZ1290)
作者简介:
徐玲琳(1986—),女,博士,讲师。
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