Bending Performance of BFRP Bars Alkali-Activated Sea Sand Concrete Beams

Abstract

Abstract: In this paper, a new type of material structural member of basalt bar alkali-activated sea sand concrete (BASC) beam was proposed. In order to study the bending performance of BASC beams, five concrete beams were fabricated. The effects of basalt fiber reinforced polymer (BFRP) reinforcement ratio and different reinforcement types on the bending performance and failure modes of alkali-activated sea sand concrete (ASC) beams were studied. The test results show that the increase of the reinforcement ratio of BASC beams has little effect on the cracking load, but it can effectively improve its ultimate load. Taking the reinforcement ratio of 0.27% as the reference group, when the reinforcement ratio increases to 0.48%, 0.75% and 1.08%, the ultimate bearing capacity of BASC beams increases by 109.46%, 119.60% and 189.66%, respectively. Compared with ordinary steel bars, the elastic modulus of BFRP bars is smaller. With the same reinforcement ratio, the cracking load of ordinary steel bar ASC beams is 50%, larger than that of BASC beams. The theoretical calculation models of bending capacity, maximum crack width and deflection of normal section are proposed. Due to the influence of chloride ion diffusion in ASC, the calculation model needs to be modified. The calculated values of BASC beams after fitting are in good agreement with the experimental values, which can provide reference for the application of BASC beams in ocean engineering.

Key words: BFRP bar, alkali-activated sea sand concrete, bending performance, calculation of normal section bearing capacity, broken form, ocean engineering

CLC Number:

TU528

FAN Xiaochun, CUI Qi, ZHANG Ao, WANG Wenqi. Bending Performance of BFRP Bars Alkali-Activated Sea Sand Concrete Beams[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4242-4253.

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