Study on the frost resistance durability of recycled aggregate concrete under an extreme cold environment

IF 0.8 Q4 ENGINEERING, CIVIL

Electronic Journal of Structural Engineering Pub Date : 2022-05-31 DOI:10.56748/ejse.2231501

Qing Su

引用次数: 1

Abstract

Recycled aggregate concrete (RAC), as a way to reuse waste concrete, is good for solving environmental and resource problems. In this paper, the frost resistance durability of RAC under an extreme cold environment was studied, RAC specimens with different replacement rates were designed, and then the indexes of the specimens, such as mass loss rate, were calculated and compared. It was found that with the progress of the freeze-thaw cycle, the higher the replacement rate of recycled concrete aggregate (RCA) was, the worse the frost resistance durability was. The mass loss rate of RAC-3 (100% RCA replacement rate) was 5.56%, the strength loss rate was 40.86%, and the relative dynamic elastic modulus was 61.89%, all of which were significantly lower than that of RAC-0. The experimental results verify that the excessively large replacement rate of RCA is not conducive to the frost resistance durability of concrete. The replacement rate of RCA needs to be paid attention to when used in an extremely cold environment.

查看原文本刊更多论文

极冷环境下再生骨料混凝土抗冻耐久性研究

再生骨料混凝土（RAC）作为一种废弃混凝土的再利用方式，有利于解决环境和资源问题。本文研究了再生混凝土在极冷环境下的抗冻耐久性，设计了不同置换率的再生混凝土试件，并对试件的质量损失率等指标进行了计算和比较。研究发现，随着冻融循环的进行，再生混凝土骨料（RCA）的替代率越高，其抗冻耐久性越差。RAC-3的质量损失率（100%RCA置换率）为5.56%，强度损失率为40.86%，相对动弹性模量为61.89%，均显著低于RAC-0。试验结果表明，RCA的替代率过大不利于混凝土的抗冻耐久性。在极端寒冷的环境中使用时，需要注意RCA的更换率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Electronic Journal of Structural Engineering Engineering-Civil and Structural Engineering

CiteScore

1.10

自引率

16.70%

发文量

期刊介绍： The Electronic Journal of Structural Engineering (EJSE) is an international forum for the dissemination and discussion of leading edge research and practical applications in Structural Engineering. It comprises peer-reviewed technical papers, discussions and comments, and also news about conferences, workshops etc. in Structural Engineering. Original papers are invited from individuals involved in the field of structural engineering and construction. The areas of special interests include the following, but are not limited to: Analytical and design methods Bridges and High-rise Buildings Case studies and failure investigation Innovations in design and new technology New Construction Materials Performance of Structures Prefabrication Technology Repairs, Strengthening, and Maintenance Stability and Scaffolding Engineering Soil-structure interaction Standards and Codes of Practice Structural and solid mechanics Structural Safety and Reliability Testing Technologies Vibration, impact and structural dynamics Wind and earthquake engineering. EJSE is seeking original papers (research or state-of the art reviews) of the highest quality for consideration for publication. The papers will be published within 3 to 6 months. The papers are expected to make a significant contribution to the research and development activities of the academic and professional engineering community.