【摘 要】
：
The influences of aggregate micro fines (AMF) on the strength, early shrinkage and pore structure of mortar,which is mixed with limestone manufactured fine sand (MFA) at a water-to-cement ratio of 0.5
【机 构】
：
School of Materials Science and Engineering, Henan Polytechnic University, 454003, Jiaozuo, China
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
The influences of aggregate micro fines (AMF) on the strength, early shrinkage and pore structure of mortar,which is mixed with limestone manufactured fine sand (MFA) at a water-to-cement ratio of 0.50, were comparatively studied.The experimental results show that the strength and early shrinkage are better when the AMF content is between 10% and 15%, and the optimal is 15%.The change regularity of the pore structure is the same.To explain the physical filling effect of AMF, the concept of free water in fresh mortar was defined,and the calculation formula of the amount of free water in fresh mortar mixture was obtained through combining the establishment of model with the test of wet pack density.The change regularity of the amount of free water with AMF agrees with the influence regularity of AMF on the performances of mortar, which shows that the influence of limestone AMF on performances of mortar are mainly caused by its physical filling effect.
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