Mechanical properties and micromorphology of redispersible emulsified asphalt powder modified cement mortar

被引：0

作者：

Liu J. ^{[1
]}

Zheng X. ^{[1
]}

Li T. ^{[2
]}

Wang C. ^{[2
]}

Zhao Y. ^{[3
]}

Li Y. ^{[1
]}

Lou L. ^{[1
]}

Shen W. ^{[4
]}

机构：

[1] State Key Laboratory of High-Speed Railway Track Technology, Beijing

[2] High-speed Railway Infrastructure Section, China Railway Lanzhou Group Co., Ltd., Lanzhou

[3] China Railway 21st Bureau Group Co., Ltd., Lanzhou

[4] High-speed Railway Infrastructure Section, China Railway Urumqi Group Company Limited, Urumqi

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 04期

关键词：

Asphalt; Cement; Mechanical properties; Microstructure; Mortar;

D O I：

10.16085/j.issn.1000-6613.2021-0875

中图分类号：

学科分类号：

摘要：

In order to solve the problem of high brittleness and poor toughness of cement-based materials, a method of doping redispersible emulsified asphalt powder (REAP) to improve the toughness of cement-based materials was presented. The redispersible emulsified asphalt particle modified cement mortar (REAPMCM) was prepared, and the REAP contents were 0, 10%, 20% and 30% of the cementitious material, respectively. The effects of REAP on the mechanical properties of REAPMCM, such as compressive strength, flexural strength, flexural-compression ratio and elastic modulus, were studied. The effects of REAP on the micromorphology of cement hydration products were analyzed, and the micromorphology of cement emulsified asphalt mortar prepared with emulsified asphalt was compared. The results showed that with the increase of REAP content, the compressive, flexural strength and elastic modulus of REAPMCM were reduced, and the flexural-compression ratio was increased. The flexural-compression ratio of REAPMCM with 30% REAP was 28.5%, which was 46.6% higher than that without REAP. The addition of REAP improved the toughness of cement-based materials, but as the age of cement hydration increased, its improvement effect decreased. As the amount of REAP increased, the total porosity of the slurry and the asphalt film area between cement hydration products increased, and its section micromorphology was basically similar to that of emulsified asphalt mortar with the same asphalt solid content. It was proved that REAP also had good dispersibility and can be distributed in the cement hydration product as a film, achieving similar application effect as the modification of cement-based materials by emulsified asphalt emulsion. © 2022, Chemical Industry Press Co., Ltd. All right reserved.

引用

页码：2015 / 2021

页数：6

共 18 条

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