摘要
使用活性低的矿渣作为细骨料配制矿渣砂混凝土,将该混凝土与使用普通河砂的混凝土进行强度实验对比,并通过扫描电子显微镜观察混凝土硬化浆体中矿渣砂和普通河砂的微观形貌,研究了矿渣砂作为细骨料使用时对混凝土强度的影响。结果显示:无论是在标准养护条件还是高温蒸养条件下,矿渣砂混凝土各个龄期的抗压强度都略低于普通河砂混凝土,但是两者的劈裂抗拉强度相差不大,矿渣砂混凝土后期的劈裂抗拉强度甚至超过普通砂混凝土。部分矿渣砂的表面发生了水化反应,其水化产物与水泥的水化产物相互搭接,对混凝土的劈裂抗拉强度有一定的贡献。
Two kinds of concrete were prepared by using grand granulated blast furnace slag （ GGBS） with low activity as fine aggregate and normal river sand, respectively. The effect of GGBS sand on the strength of concrete was studied by strength test and scanning electron microscope （ SEM） . The results show that, whether under standard curing condition or high temperature curing condition, the compressive strength of GGBS sand concrete is lower than that of natural river sand concrete at any age, while the splitting tensile strengths of these two kinds of concrete are close to each other. At late ages, the splitting tensile strength of GGBS sand concrete may even exceed that of natural river sand concrete. The morphologies of hardened paste show that a part of GGBS sand takes part in hydration, and its hydration products can built connection with those of cement, which makes some contributions to the splitting tensile strength of concrete.
出处
《电子显微学报》
CAS
CSCD
2015年第3期205-210,共6页
Journal of Chinese Electron Microscopy Society
基金
国家大学生创新创业训练计划资助项目(No.201410003002)
关键词
矿渣砂
抗压强度
劈裂抗拉强度
显微形貌
GGBS sand
compressive strength
splitting tensile strength
morphology
作者简介
王强（1983-），男（汉族），河北人，博士，副教授．E-mail：w-qiang@tsinghua．edu．cn
