EXPERIMENTAL STUDY OF BOND BETWEEN NEAR-SURFACE MOUNTED BFRP BARS AND CONCRETE UNDER FREEZE-THAWING CYCLES

Abstract

Abstract: Alpine areas to explore the effect of freeze-thaw cycles on the embedded FRP reinforcement concrete interface bonding durability, in view of the basalt fiber reinforced composite material (BFRP) tendons embedded reinforcement concrete structure, using epoxy resin (EP) and high toughness of fiber reinforced cement matrix composites (ECC) as the bonding material embedded FRP reinforcement-pull-out tests, from the concrete analysis under the action of freeze-thaw cycle embedded FRP and concrete interface failure mode and the bonding mechanism of degradation, the freezing and thawing cycles, bonding materials, concrete substrate effect on the properties of adhesive performance, the results showed that: Basic performance under the condition of different erosion specimen failure mode for the rubber matrix and shear failure of concrete, rubber matrix fracturing, adjacent to the concrete-concrete thin layer of adhesive interface shear failure, ECC matrix and shear failure of concrete, FRP and ECC interface bond destruction of five kinds of failure modes, the ultimate bond bearing capacity of the specimen increased with the increase of cycling times show varying degrees of decline, within fifty loops on the cohesive force of specimen is small, the influence of ECC specimen compared to epoxy resin adhesive specimen, caking capacity below the epoxy resin specimens, but showed good ductility.

Key words: freeze-thawing, near-surface mounted, BFRP bars, bond performance, high performance fiber reinforced cementitious composite

CLC Number:

TB332

JIN Liang-liang, YANG Shu-tong. EXPERIMENTAL STUDY OF BOND BETWEEN NEAR-SURFACE MOUNTED BFRP BARS AND CONCRETE UNDER FREEZE-THAWING CYCLES[J]. Composites Science and Engineering, 2020, 0(8): 70-75.

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