材料期刊网

为研究不同养护温度下矿粉水泥石早期（28 d）强度及细观孔结构分布特征，设定水泥石的水灰比为0．24，以掺入不等量的矿粉为掺合料，分别将水泥试块在－3℃和20℃条件下养护28 d，测定水泥石的抗压强度，用孔结构分析仪对细观孔结构进行分析，并通过水泥石的孔隙结构计算水泥石的实际抗压强度，对比分析其规律。结果表明：矿粉掺量相同时，－3℃养护下水泥石较20℃养护下水泥石早期抗压强度明显降低，水泥石硬化后含气量变小，孔间距系数和气孔平均弦长增大，孔径粗化严重；随着矿粉掺量的增多，水泥石早期抗压强度呈下降趋势，水泥石硬化后含气量增大，孔间距系数和气孔平均弦长增大，其中－3℃养护下的水泥石孔间距系数、气孔平均弦长和早期抗压强度变化趋势较20℃养护下变化明显。

In order to study the early (28 d) strength and distribution of pore microstructure characteristics of slag cement block under different curing temperature , the water cement ratio of the cement block was 0.24, doped with different amounts of slag as admixture to the cement block , the cement blocks were maintained at minus three degrees Celsius and twenty degrees Celsius for twenty -eight days respectively , measure the compressive strength of cement block , analysis of the early pore structure of cement block by using the pore structure analyzer , then through the pore structure of cement block calculate the actual strength of cement blocke , comparative analysis of its law .The results show that:at the same amount of slag, the early compressive strength of the cement blocks at minus three degrees Celsius curing temperature is decreased significantly than at twenty degrees Celsius curing temperature , hardened cement air containing volume becomes small , the bubbles spacing factor and average pore chord length increase, pore coarsening seriously;With the increase of slag amount , the early compressive strength of cement block is decreased , hardened cement air containing volume increases , the bubbles spacing factor and average pore chord length increase ,the bubbles spacing factor , average pore chord length and early compressive strength of cement blocks at minus three degrees Celsius curing temperature change trend is more obviously than at twenty degrees Celsius .