中文摘要：

采用旋转黏度计测试了基于混凝土等效砂浆法所配制砂浆的塑性黏度和触变性,采用冲模–揭板试验研究了不同塑性黏度和触变性的砂浆硬化后表面的气泡特点,采用硬化后砂浆表层气泡率和表层气泡直径对砂浆的静态稳定性进行了表征。结果表明：塑性黏度和触变性对硬化后砂浆表层气泡率和直径均有重要影响。相对于触变性,塑性黏度与砂浆表层气泡率和直径的相关性更高。砂浆表层气泡率和气泡直径均随黏度增大而显著减少,砂浆黏度不低于3.5 Pa·s时,表层气泡率小于5%,直径大于5 mm的气泡数量接近零。砂浆表层气泡率随触变性增加而减少,砂浆触变性不低于12.5×10^3 Pa/s时,砂浆表层气泡率基本小于10%。当砂浆塑性黏度不低于3.5 Pa·s且触变性不低于12.5×10^3 Pa/s时,其静态稳定性较好。

英文摘要：

The plastic viscosity and thixotropy of self-compacting concrete equivalent mortar （SCCEM） were tested by rotational viscometer. The surface bubbles characteristics of mortar with different plastic viscosities and thixotropies were investigated by a self-designed filling-box device. Two parameters of surface bubbles ratio （SBR） and surface bubble diameter （SBD） of hardened mortar were used to characterize the static stability of mortar. The results show that the plastic viscosity and thixotropy both have great influences on SBR and SBD. Compared to the thixotropy, the correlation between the plastic viscosity and SBR/SBD is better. SBR and SBD of mortar decrease dramatically with the increasing plastic viscosity. When plastic viscosity is no less than 3.5 Pa＇s, SBR is less than 5% and SBD larger than 5 mm is close to zero. SBR of mortar reduces with the increasing thixotropy. SBR is almost less than 10% when the thixotropy of fresh mortar is more than 12.5 × 10^3 Pa/s. When the plastic viscosity is more than 3.5 Pa.s and the thixotropy of fresh mortar is more than 12.5× 10^3 Pa/s, SCCEM has a good static stability.