Mechanical Properties and Pore-Structure of Hardened Cement Paste with Low Water-Binder Ratio

被引：0
|
作者：
Han S. [1 ]
Cui Y. [1 ]
Zheng Y. [1 ]
An M. [1 ]
Yu Z. [1 ]
机构：
[1] School of Civil Engineering, Beijing Jiaotong University, Beijing
来源：
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2019年 / 47卷 / 02期
关键词：
Hardened cement paste; Hydration degree; Low water-binder ratio; Mechanical properties; Pore structure;
D O I：
10.14062/j.issn.0454-5648.2019.02.01
中图分类号：
学科分类号：
摘要：
Cement ratio of concrete material decreases with the increase of the strength and durability requirements of engineering for concrete. However, some characteristics like the strength, hydration degree of cementitious materials and pore structure can appear for low water-binder ratio materials. In this work, a water-to-binder cement slurries with water-binder ratio of 0.13-0.21 were designed. The standard curing and high-temperature steam curing were selected. The mechanical properties, hydration degree and microstructure change of hydration products of hardened slurry were investigated. The results show that the flexural strength of the hardened cement paste increases, while the compressive strength firstincreases and then decreases with the decrease of the water-binder ratio. The cement paste has an optimum water-binder ratio, maximizing the strength of the cementitious material system. The optimum water-binder ratio depends on the variation of the pores of the hardened paste and is also affected by the curing temperature. The hydration degree of the cementitious material is linearly related to the water-binder ratio when the water-binder ratio is greater than 0.15. Reducing the water-binder ratio can effectively refine the capillary pore and reduce the porosity, while the extremely low water-binder ratio and high temperature steaming will cause macropores to coarsen. It is indicated that the refinement degree of the pore structure affects the mechanical properties of the hardened paste to some extent, while the hydration degree of the cementitious material only has a minor effect on the the mechanical properties of the hardened paste at a low water-binder ratio. © 2019, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.
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页码：153 / 160
页数：7
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