Abstract: In order to improve the brittle failure characteristics of high strength lightweight aggregate concrete (HSLC), steel fiber (SF) and polypropy-lene fiber (PF) were used to strengthen HSLC. The effects of the two fibers on the uniaxial compression performance of HSLC were studied through uniaxial compression tests. The results show that when the volume content of SF and PF is 2.0% and 0.2%, respectively, there is the best hybrid effect. The stress at the inflection point and the strain at the convergence point of the stress-strain curve increased by 10.0% and 56.5% respectively compared with that of SF alone, and increased by 99.1% and 150% respectively compared with that of PF alone; the peak stress, peak strain and elastic modulus of HSLC increased by 19.0%, 1.20% and 16.9% respectively. Finally, based on the test data, the calculation formulas of peak stress, peak strain and elastic modulus considering the hybrid effect of two fibers are proposed, and the uniaxial compression constitutive model of hybrid fiber reinforced HSLC with two parameters is established, which is in good agreement with the test curve. The results can provide theoretical reference for the structural design of fiber reinforced HSLC.
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2024, Vol. 38 
