关键词: 超细熟料;石灰石粉;堆积密实度;填充效应;活性效应

Abstract: In order to improve the effective utilization ratio of cement clinker , reduce the production cost of cement and improve the properties of limestone Portland cement .The limestone Portland cement is prepared from ultra-fine cement clinker, limestone powder.On the basis, studied the influence of ultra-fine cement clinker filling effect on the pack density and paste fluidity and mortar strength of limestone Portland cement, and the influence of ultra-fine cement clinker active effect on the mortar strength and hydration products.The results show that the particle pack density and the paste fluidity of ultra -fine clinker-limestone powder composite cement have a certain relevance .That is to say, the greater pack density can obtain the better fluidity of the paste .Compared with the ordinary fineness cement clinker , the ultra-fine clinker has higher hydration activity so that it can improve the compressive and the flexural strength of the composite cement.In addition, the activity effect of each age is ideal when the content of ultra-fine clinker is 30％.The ultra-fine cement clinker filling effect improved the mortar strength of composite cement, And when the content of ultra-fine clinker is 30％, the influence of filling effect on strength is the most obvious.C3 A in ultra-fine clinker reacted with CaCO 3 in limestone powder to produce more hydrated calcium carboaluminate compared with ordinary fineness cement clinker .

Key words: ultra-fine cement clinker;limestone powder;pack density;filling effect;active effect