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建筑石膏与胶凝材料
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葡聚糖 分子质量对水泥水化的影响研究

作者:杜加伟1,郦亮2,孟洪峰2,王瑞1,3,候世磊2

关键字:葡,聚糖,分子,质量,对,水泥,水化,的,影响,

 
(1.江苏苏 博特新材料股份有限公司,江苏 南京  211103;
2.宁波市 轨道交通集团有限公司,浙江 宁波  315101;
3.高性能 土木工程材料国家重点实验室,江苏 南京  210008)
    摘要:通过等 温量热仪及半绝热的胶砂直接法研究了相对分子质量分别为5000、10 000、20 000和40 000的葡聚 糖对水泥净浆和胶砂水化放热的影响。结果显示,不同分 子质量的葡聚糖均具有抑制水泥水化历程的作用;随葡聚 糖分子质量增大,水泥水化诱导期缩短;水泥净 浆水化放热速率峰值和胶砂水化温峰值随葡聚糖分子质量的增大而增大;0.3%掺量下,相对分子质量分别为5000、10 000、20 000和40 000的葡聚糖水泥净浆在20 ℃恒温条 件下的水化放热速率峰值较未掺葡聚糖的基准样降幅分别为55.8%、35.4%、48.9%和25.4%,水泥胶 砂温峰分别降低9.7、7.1、4.8、2.2 ℃。
    关键词:葡聚糖;相对分子质量;水泥水化
    中图分类号:TU528.042+.3        文献标识码:A        文章编号:1001-702X(2020)10-0057-03
 
The study on the effect of molecular weight of dextran on the hydration of cement
DU Jiawei1,LI Liang2,MENG Hongfeng2,WANG Rui1,3,HOU Shilei2
(1.Jiangsu Sobute New Materials Co. Ltd.,Nanjing 211103,China;
2.Ningbo Rail Transit Group Co. Ltd.,Ningbo 315101,China;
3.State Key Laboratory of High Performance Civil Engineering Materials,Nanjing 210008,China)
    Abstract:The influence of molecular weight of dextran(Mw=5000,10 000,20 000 & 40 000) on the hydration of cement paste and mortar was evaluated via the method of isothermal calorimeter and semi-adiabatic method,respectively. The results indicated that dextran with different molecular weight can inhibit the hydration process of cement. With the increase of relative dextran molecular weight,the induction period of cement hydration shortened,and the peak of hydration heat release rate of cement paste and hydration temperature of cement mortar increased. At the dosage of 0.3%,compared with the control sample without dextran,the peak of hydration heat release rate of cement paste decreased by 55.8%%,35.4%,48.9% and 25.4% at 20 ℃ respectively,and the temperature peaks of cement mortar decreased by 9.7 ℃,7.1 ℃,4.8 ℃ and 2.2 ℃ respectively. 
    Key words:dextran,relative molecular weight,cement hydration

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