Mechanical Properties of Polypropylene Fiber Recycled Brick Aggregate Concrete and Its Influencing Factors by Gray Correlation Analysis

Shangwei Gong, Lichao Bai, Zhenyu Tan, Lina Xu, Xiaohong Bai and Zhanfang Huang ()
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Shangwei Gong: School of Civil Engineering and Geomatics, Shang Dong University of Technology, Zibo 255049, China
Lichao Bai: School of Civil Engineering and Geomatics, Shang Dong University of Technology, Zibo 255049, China
Zhenyu Tan: School of Engineering Management, Krirk University, Bangkok 10220, Thailand
Lina Xu: School of Transportation Science and Engineering, Jilin Jianzhu University, Changchun 130118, China
Xiaohong Bai: College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Zhanfang Huang: School of Civil Engineering and Geomatics, Shang Dong University of Technology, Zibo 255049, China

Sustainability, 2023, vol. 15, issue 14, 1-19

Abstract: Making construction waste into raw materials for recycled concrete is beneficial for resource conservation and environmental protection. This paper investigated the effects of different recycled brick aggregate (RBA) replacement rates (30%, 50%, 70%, and 100%) and different contents of polypropylene fibers (PPFs) (0.08%, 0.10%, 0.12%, 0.16%, and 0.2%) on the mechanical properties of recycled brick concrete. Gray correlation was also used to analyze the degree of effect factors on the mechanical properties of concrete. The results showed that the mechanical properties decreased when the natural coarse aggregate (NCA) was replaced with RBA, while PPFs could better improve the mechanical properties of RBA concrete. The improvement of compressive and flexural properties was optimal when the PPF content was 0.12%; the improvement of tensile properties was optimal when the PPF content was 0.2%. In addition, PPFs significantly improved the toughness of RBA concrete. The gray correlation degrees between compressive strength (tensile strength, flexural strength) and NCA, RBA, and PPFs were 0.8964 (0.8691, 0.8935), 0.7301 (0.6530, 0.7074), and 0.5873 (0.5870, 0.5840), respectively.

Keywords: recycled brick aggregate; polypropylene fibers; mechanical properties; concrete; gray correlation analysis; resource conservation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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