目录
建筑石膏与胶凝材料
首页

盐石膏对硅酸盐水泥浆体 流变性能的影响

作者:蒋林峰,李从波,杨斯豪,李楚坤,贾森春

关键字:盐,石膏,对,硅酸盐,水泥浆,体,流变,性能,的,

 
(广州大学 土木工程学院,广东 广州  510006)
摘要:对盐石膏进行扫描电镜和X射线衍射分析,获得其颗粒形态特征和化学成分,并采用RS-SST型流变仪研究盐石膏掺量对盐石膏-水泥浆体屈服应力、塑性黏度和触变性的影响。结果表明:盐石膏的主要化学成分为二水硫酸钙和碳酸钙;盐石膏-水泥浆体的流变性属于宾汉姆流体模型,随着剪切速率的增大,浆体明显表现出剪切变稀现象;随着盐石膏掺量的增加,水泥浆体的屈服应力和塑性黏度都增大,触变性逐渐增强。
关键词:流变性;盐石膏;屈服应力;塑性黏度;触变性
中图分类号:TU528.04        文献标识码:A        文章编号:1001-702X(2019)07-0045-04
 
Influence of salt gypsum on rheological property of Portland cement slurry
JIANG Linfeng,LI Congbo,YANG Sihao,LI Chukun,JIA Senchun
(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)
Abstract:Scanning electron microscopy (SEM) and X-ray diffraction analysis(XRD) of salt gypsum were carried out to obtain the particle morphology and chemical composition. The RS-SST rheometer was used to study the effect of salt gypsum dosage on the yield stress,plastic viscosity and thixotropy of salt gypsum-cement slurry. The results show that the main chemical components of salt gypsum are calcium sulfate dihydrate and calcium carbonate;the rheology of salt gypsum-cement slurry belongs to Bingham fluid model. With the increase of shear rate,the slurry shows obvious shear thinning,with the increase of salt-gypsum content,the yield stress and plastic viscosity of cement slurry increase,and its thixotropy gradually increases.
Key words:rheology,salt gypsum,yield stress,plastic viscosity,thixotropy