非晶态C_(12)A_7对干混砂浆性能的影响  

Effects of amorphous C_(12)A_7 on properties of dry-mixed mortar

作　　者：李文平[1] 王栋民[1] 王奕仁 张江涛[1] 张雷[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院混凝土与环境材料研究所,北京100083

出　　处：《新型建筑材料》2017年第5期46-49,共4页New Building Materials

基　　金：国家自然科学基金项目(51572293)

摘　　要：研究非晶态C_(12)A_7取代部分普通硅酸盐水泥对干混砂浆凝结时间、流动性、力学性能、保水性和吸水率的影响,通过SEM对水化产物的形貌进行了表征。结果表明:当非晶态C_(12)A_7取代水泥量为6%时,干混砂浆的凝结时间为84 min,28 d抗压强度为47.1 MPa,吸水率为3.16%,保水率为96%。非晶态C_(12)A_7能够缩短砂浆的凝结时间,提高砂浆的抗压强度,降低砂浆的吸水率,使砂浆具有较好的保水性。The effects of amorphous C12A7 which partly replaced ordinary Portland cement are studied in this paper on the early properties including setting time,fluidity, mechanical property,water-retaining property and water-absorption property of drymixed mortar, hydration products were tested by Scanning electron microscope （SEM）. The results showed that when the amount of ordinary Portland cement was 6% replaced by amorphous C12A7, the setting time of the mortar is 84 rain,the 28 d compressive strength is 47.1 MPa,the water-absorption ratio is 3.16% and the water-retention is 96%. It indicated that amorphous C12A7 can decrease the setting time of mortar, increase the mechanical properties of mortar, decrease the water-absorption of mortar and also improve the water-retention property of dry-mixed mortar.

关 键 词：非晶态C12A7 干混砂浆 凝结时间 保水率 

分 类 号：TU528.042[建筑科学—建筑技术科学]