矿物掺合料对砂浆塑性收缩开裂影响的研究  

Research on Influence of the Mineral Admixture on the Plastic Shrinkage Cracking of Cement Mortar

作　　者：杨晓杰[1] 明守旺 马一平[1] 李奎[1] 张延河[1] 

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海201804

出　　处：《粉煤灰综合利用》2016年第5期7-11,共5页Fly Ash Comprehensive Utilization

基　　金：国家自然基金项目(项目编号:51308406)水泥基材料塑性开裂本构关系研究及开裂行为预测;十三五重点专项土工建筑增强材料制备与应用(项目编号:2016YFB0303200)

摘　　要：采用平板法和八字模法,通过评估不同掺量粉煤灰、矿粉与硅灰的砂浆塑性阶段的收缩应力与塑性抗拉强度等,研究了矿物掺合料对砂浆塑性阶断收缩开裂的影响。研究结果表明：随着粉煤灰掺量（0~50%）的增加,掺量小于30%时塑性收缩应力和塑性抗拉强度同步增大,掺量超过30%后塑性收缩应力继续增大,塑性抗拉强度有所降低;抗裂指数先变化不大后有所减小;随着矿粉掺量（0~30%）的增加,掺量30%以内塑性收缩应力和塑性抗拉强度都增大,抗裂指数有一定程度增大;随着硅灰掺量（0~5%）的增加,塑性收缩应力增大,塑性抗拉强度增大,抗裂指数明显提高。The influence of fly ash,mineral powder and silica fume on plastic shrinkage cracking and plastic viscosity of cement mortar were studied by cracking plate method and eight model method. The results show that： with the increase of fly ash（ 0- 50%）,as addition of fly ash is less than 30%,both plastic shrinkage stress and plastic tensile strength increase. The cracking- resistance index has little change,as addition of fly ash is more than 30%,the plastic shrinkage stress increases but the plastic tensile strength decreases. The cracking- resistance index changs less before decrease. With the increase of mineral powder（ 0- 30%）,both plastic shrinkage stress and plastic tensile strength increase,and the cracking- resistance index increases a little. With the increase of silica fume（ 0- 5%）,plastic shrinkage stress decreases but plastic tensile strength increases and cracking- resistance index increases clearly.

关 键 词：矿物掺合料 塑性收缩开裂 抗裂指数 本构关系 

分 类 号：TV432.1[水利工程—水工结构工程]