石灰石尾矿机制砂制备干粉砂浆的性能研究

摘要

采用含有16％石粉的机制砂为原料制备干粉砂浆。研究羟丙基纤维素、消泡剂、减水剂及粉煤灰对M5．0～M30干粉砂浆性能的影响。结果表明：纤维素掺入砂浆，大大改善了砂浆保水性能但使强度有所降低；在干粉砂浆中加入0．1％的纤维素，同时加入消泡剂和减水剂，可以提高强度；粉煤灰的加入可以改善胶砂比较小的干粉砂浆的泌水现象。%The dry-mixed mortar is made of the mechanism sand w hich contains 16% limestone powder .This article studied the in-fluence of hydroxyl propyl cellulose ,defoamer ,water reducer and fly ash on the performance of M 5 .0-M30 dry-mixed mortar .T he results show that mixing fiber into cement mortar greatly improves the cement′s water retention capacity but its strength decreased .Addition of 0 .1% fiber into dry-mixed mortar ,mixing with the defoamer and water reducer at the same time ,can improve the cement′s strength .The addition of fly ash can improve the bleeding of dry-mixed mortar with small cement aggregate ratio .