胶凝材料弹性模量对水泥基材料徐变性能的影响

EFFECT OF ELASTIC MODULUS OF BINDER ON CREEP BEHAVIOR OF CEMENT-BASED MATERIALS

采用纳米压痕技术测试了两个品种的粉煤灰、水泥及磨细矿渣的弹性模量,以砂浆徐变度为目标,针对胶凝材料弹性模量变化进行实验设计,分析了胶凝材料弹性模量对水泥基材料徐变性能的影响。结果表明:胶凝材料的弹性模量对砂浆徐变度有较大影响,改变磨细矿渣弹性模量可使试件360 d徐变度变化幅度达34.4%;高弹模胶凝材料的砂浆试件力学性能稳定性更好,实际应用中除了考虑徐变性能变化,也要综合考虑强度等因素的影响。

The elastic modulus of fly ash, cement and slag of two varieties were tested by nano- indentation technique with mortar creep degree as the goal, experimental design for elastic modulus of cementitious materials, cementitious materials elastic modulus on the creep properties of cement-based materials influence. The results show that the elastic modulus of cementitious material has a great influence on the creep degree of mortar. Change the elastic modulus of the slag, the specimens 360 days creep amplitude reached to 34.4%. The mechanical properties of the mortar specimens with high modulus of elasticity are better than those of the mortar. In practical applications, considering the creep properties, the influence of the factors such as strength should be considered.