Properties and hydration mechanism of composite binder used in high strength shaft concrete

被引：0

作者：

Li, Kang ^{[1
]}

Liu, Juan-Hong ^{[1
]}

Bian, Li-Bo ^{[1
]}

机构：

[1] College of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing

来源：

Meitan Xuebao/Journal of the China Coal Society | 2015年 / 40卷

关键词：

Composite binder; Crack controlling; High strength shaft concrete; Hydration heat; Hydration mechanism;

D O I：

10.13225/j.cnki.jccs.2015.0910

中图分类号：

学科分类号：

摘要：

For high-strength large volume shaft concrete, its center temperature of inner shaft can be up to 80 ℃, while the inside of outer shaft is around 10 ℃. This will inevitably lead to concrete cracking and durability reduction. To solve these problems, the hydration characteristics of composite binder applied to high strength shaft concrete and its effect on the properties of C70 concrete are investigated. The results show that the total hydration heat of the composite binder is one half of the conventional cementitious material. The compressive strength of C70 concrete with composite binder continuously grow by 14.8% from 28 d to 180 d. Its porosity is low, and its harmful pore reduces. The concrete has good crack resistance. XRD and SEM tests show that C70 concrete with composite binder is without Ca(OH)2 crystal after hydrating for 180 d, and the main hydration product is a dense type III C-S-H gel. © 2015, China Coal Society. All right reserved.

引用

页码：353 / 358

页数：5

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