Mechanical Properties and Strength Index Conversion of Steel Fiber Geopolymeric Recycled Concrete
DONG Shuo1,2, ZHENG Lisen2, SHI Fengwei1,2,*, WANG Lai1,2, LIU Zhe3
1 Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, Shandong, China 2 School of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, Shandong, China 3 School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China
Abstract: A total of 240 steel fiber geopolymeric recycled concrete (SFGRC) specimens were prepared, with recycled coarse aggregate replacement ratio (0%—100%) and steel fiber volume fraction (0%—1.5%) as the primary variables, and these specimens were tested for basic mechanical properties and observed for microstructural morphology. The results indicated that replacing natural aggregate with recycled coarse aggregate reduced all fundamental mechanical properties of the concrete. For SFGRC specimen with a 100% recycled aggregate replacement and 1.0% steel fiber content, its cube compressive strength, axial compressive strength, elastic modulus, splitting tensile strength, and flexural strength decreased by 15%, 9%, 25%, 15%, and 15%, respectively, while its peak strain increased by 24%. Except for elastic modulus, incorporating steel fibers significantly improved the mechanical properties of the concrete, and its failure exhibited a ductile mode. When the recycled aggregate replacement ratio reached 100% with 1.5% steel fiber content, the cube and axial compressive strength, peak strain, splitting tensile strength, and flexural strength of the specimen increased by 15%, 9%, 10%, 65%, and 39%, respectively. Based on experimental results, a series of calculation formula and conversion relationship for the fundamental strength indices of SFGRC were proposed, accounting for the effects of recycled aggregate replacement and steel fiber content.
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2025, Vol. 39 
