摘要
研究了铝酸盐水泥-硅酸盐水泥-石膏复合胶凝体系对自流平材料性能的影响以及渗透型液体硬化剂对材料表面的改性作用,采用XRD、TG-DSC和SEM分析了胶凝体系的水化产物。结果表明：在铝酸盐水泥-硅酸盐水泥二元体系中,随着硅酸盐水泥掺量的增加,砂浆流动度经时损失逐渐扩大,凝结时间缩短,干缩率增大,各龄期强度均有所降低,但1~3 d和3~28 d强度增长幅度更大。在铝酸盐水泥-硅酸盐水泥-石膏三元胶凝体系中,增加α-半水石膏的掺量可促进砂浆凝结硬化,减小干燥收缩率,提高早期强度,但后期强度的增幅有所减小;增加硅酸盐水泥掺量会使砂浆流动度经时损失显著加大,凝结时间缩短,早期强度无明显变化,后期强度增幅较大。在自流平材料表面涂刷硬化剂可有效提高其耐磨性,减少干燥失水率。水化铝酸钙的微观形貌不规则,其XRD衍射峰不显著。在三元胶凝体系的水化产物中,存在着大量真棒状的钙矾石和六方片状的单硫型水化硫铝酸钙。
Theinfluence of mixed binder systems on self-leveling mortar and surface hardener on materials surface have been investigated. The hydrated products and microstructures were characterized by X-ray diffraction,thermal analysis instrument and SEM,respectively. The results show that the increasing replacement of Portland cement by calcium aluminate cementin binary systems will cause mortars larger flow value loss,shorter setting times,less dimensional stability,an obvious decline strength but higher growth rate from 1 to 3 d and 3 to 28 d. In the ternary systems,with the increasing proportion of α-hemihydrate calcium sulfate,mortars show shorter setting time,less drying shrinkage and higher early strength,but lower growth rate in the late. In the ternary systems,the increasing content of Portland cement cause larger flow value loss and more rapid hardening rate,little effect on early strength but higher growth rate in the late. For screeds brushed surface hardener,both the abrasion and mass loss are decreased. The hydrated calcium aluminate have irregular morphology,and cannot be detected by XRD.In the hydration of ternary systems,AFt with acicular and AFm with hexagonal flake can be observed.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2016年第3期686-693,共8页
Bulletin of the Chinese Ceramic Society
基金
"十二五"国家科技支撑计划课题(2014BAL03B04)
关键词
面层自流平
胶凝体系
钙矾石
耐磨性
overlayment of self-leveling
binder systems
ettringite
abrasive resistance
