Effect of NaCl Dry⁃Wet Cycles on Properties of Mixed Cement Reactive Powder Concrete

被引：0
|
作者：
Wang H. [1 ]
Wang K. [1 ]
Liang Z. [1 ]
机构：
[1] School of Civil & Environmental Engineering and Geography Science, Ningbo University, Zhejiang, Ningbo
来源：
Cailiao Daobao/Materials Reports | 2023年 / 37卷 / 23期
关键词：
NaCl dry⁃wet cycle; polypropylene fibers (PPFs); reactive powder concrete (RPC); strength; sulphoaluminate cement (SAC);
D O I：
10.11896/cldb.22070005
中图分类号：
学科分类号：
摘要：
Effects of the compressive and flexural strengths of reactive powder concrete (RPC) cured for 1, 3, 7, 14 and 28 d after adding sulphoaluminate cement (SAC) were studied. In addition, the effects of NaCl dry⁃wet cycles on RPC compressive strength, flexural strength, bond strength and chloride ion permeability coefficient of composite cement (SAC accounts for 50% of the total cement) were emphatically studied. Results show that the increase of SAC content in RPC at early ages (less than 7 d) has a positive impact on its compressive and flexural strength. However, when the curing age is greater than 7 d, the addition of SAC has a negative effect on the compressive and flexural strength of RPC. For RPC with 50% SAC, the strength will grow with the volume fraction of PPFs increases. When the fiber volume fraction increases from 2.5% to 3.0%, the strength of RPC tends to be stable. NaCl dry⁃wet cycles will reduce the strength of RPC and increase the chloride ion permeability of RPC. The addition of PPFs will delay the decrease of RPC strength and reduce the permeability of chloride ions. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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