Experimental Study on the Strength and Stress–Strain Properties of Waste Concrete Fine Aggregate and Cement-Solidified Sludge

Xiaoya Bian, Haodong Yang, Jiale Chen, Hui Liu () and Xuyong Chen
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Xiaoya Bian: School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430074, China
Haodong Yang: School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430074, China
Jiale Chen: School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430074, China
Hui Liu: Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Xuyong Chen: School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430074, China

Sustainability, 2022, vol. 14, issue 19, 1-16

Abstract: In this study, waste concrete fine aggregates and cement are applied to sludge solidification and resource recycling. The unconfined compressive strength (UCS) test is performed to investigate the variation in the strength and stress–strain properties of the solidified sludge with the content and particle size of waste concrete fine aggregate, cement content, and curing time. The results show that incorporating waste concrete fine aggregates can improve the UCS of cement-solidified sludge, which can achieve the optimum effect when the fine aggregate content ranges from 12% to 15%. However, compared with the fine aggregate content, the cement content and curing time are the main factors in improving the strength of waste concrete fine aggregate and cement-solidified sludge (WCSS). The stress–strain curves of WCSS comprise four stages. The failure strain ε f of WCSS with four fine aggregate contents decreases in a power function with the increase in q u , and ε f is mostly distributed when the content is 1.1–2.1%. A linear relationship is observed between E 50 and q u . This study attempts to promote the recycling of waste concrete fine aggregates and obtain solidified sludge with excellent mechanical properties, providing some reference for practical engineering applications.

Keywords: deformation modulus; solidification; stress–strain properties; unconfined compression strength; waste concrete fine aggregate (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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