Effect of borax on early hydration and rheological properties of reactivated cementitious material

被引：4

作者：

Zhang, Linglei ^{[1
,2
,3
]}

Ji, Yongsheng ^{[3
]}

Huang, Guodong ^{[3
]}

Gao, Furong ^{[3
]}

Dong, Zuochao ^{[4
]}

机构：

[1] China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou, Jiangsu, Peoples R China

[2] China Univ Min & Technol, Jiangsu Key Lab Environm Impact & Struct Safety E, Xuzhou, Jiangsu, Peoples R China

[3] China Univ Min & Technol, Sch Mech & Civil Engn, Xuzhou, Jiangsu, Peoples R China

[4] Jiangsu Univ Sci & Technol, Sch Architecture & Civil Engn, Zhenjiang, Jiangsu, Peoples R China

来源：

ADVANCES IN CEMENT RESEARCH | 2019年 / 31卷 / 05期

关键词：

composite materials; viscosity; yield stress; RECYCLED AGGREGATE; FLY-ASH; PASTE; DEHYDRATION; CONCRETE; BEHAVIOR; WASTE;

D O I：

10.1680/jadcr.18.00051

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The influence of borax on the early hydration and rheological properties of dehydrated cement paste (DCP) composite reactivated cementitious materials (DCRCM) is investigated through analysis of the hydration kinetics and measurement of rheological parameters. Results show that the presence of borax can effectively restrain the early hydration rate of DCRCM, and this leads to reductions in both the hydration products and the flocculent structure in the paste. Obvious shear thinning occurs in the fresh DCRCM paste with the increase of shear rate, followed by gradually stabilised viscosity. As the amount of borax is increased, the yield stress and plastic viscosity of DCRCM paste decrease and the rheological properties are significantly improved. However, when the amount of borax is 4%, the rheological type of DCRCM paste changes to shear thickening at a high shear rate, which is unfavourable in terms of the improvement of rheological properties.

引用

页码：235 / 242

页数：8

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