非晶态C12A7对干混砂浆性能的影响

关键字：非晶态C12A7,干混砂浆,凝结时间,保水率

[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]

    摘要：研究非晶态C12A7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C12A7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C12A7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。
    关键词：非晶态C12A7；干混砂浆；凝结时间；保水率
    中图分类号：TU57.8+1        文献标识码：A        文章编号：1001-702X（2017）05-0046-04

Effects of amorphous C12A7 on properties of dry-mixed mortar
LI Wenping，WANG Dongmin，WANG Yiren，ZHANG Jiangtao，ZHANG Lei
（Research Institute of Concrete and Eco-materials，School of Chemical & Environmental Engineering，China University of Mining & Technology，Beijing 100083，China）

    Abstract：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 dry-mixed 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 min，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.
    Key words：amorphous C12A7，dry-mixed mortar，setting time，water-retention