Tensile Property and Crack Control Mechanism of Basalt Fiber Reinforced Polymer Bar Reinforced ECC

Abstract

Abstract: Engineered cementitious composite (ECC) has become a research hotspot because of its high toughness and multiple cracking characteristics. Fiber reinforced polymer (FRP) has attracted extensive attention because of its high tensile strength, low density and good corrosion resistance. In order to study the tensile property of basalt fiber reinforced polymer (BFRP) bar reinforced ECC (BFRP-ECC) and the crack control mechanism of bars on the matrix, considering different types of matrix and reinforcement ratio, an experimental program on ECC dog-bone specimens, BFRP-ECC and BFRP-mortar thin plate specimens was conducted under uniaxial tensile loading. At the same time, the full field strain and cracking state of specimens were obtained by digital image correlation (DIC) technology. Based on Richard's elastic-plastic stress-strain formula, the BFRP-ECC stress-strain constitutive model was proposed. The results show that the ultimate tensile stress of BFRP-ECC increases with the increase of reinforcement ratio. The enhancing effect of ECC matrix on the tensile property of composites is better than that of mortar matrix. At the same time, the composites based on ECC are obviously better than those based on mortar in the control of crack spacing and width. BFRP bar can increase the bridging stress at BFRP-ECC cracks, reduce the crack spacing and width, and increase the number of cracks. The uniaxial tensile stress-strain constitutive model of BFRP-ECC established in this paper is in good agreement with experimental data, which better reflects the tensile stress-strain relationship of BFRP-ECC.

Key words: engineered cementitious composite, basalt fiber reinforced polymer bar, uniaxial tension, crack control, stress-strain constitutive model, digital image correlation, reinforcement

CLC Number:

TU528

OUYANG Jianxin, GUO Rongxin, WAN Fuxiong, MA Qianmin, YANG Yang. Tensile Property and Crack Control Mechanism of Basalt Fiber Reinforced Polymer Bar Reinforced ECC[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2684-2695.

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