Abstract:
Textile reinforced self-stressing concrete exhibits superior performance of high crack resistance, bending resistance and toughness, but the complex debonding failure mode between two-phase materials seriously limits the synergistic bearing of materials. Therefore, in order to establish a unified bonding performance characterization, this paper designed a whole-process rigid constraint pull-out test to test the interface behavior of basalt and alkali-resistant glass fiber bundles with varying fiber fineness (defined as the weight in grams per
1000 meters of fiber at standard moisture regain, measured in Tex) under high self-stress conditions. Based on the relationship between macroscopic mechanical phenomena and energy balance, and the influence of peeling size effect, a parametric calculation method with the critical energy release rate
Gc of the interfacial bonding layer as the core index was proposed. The results show that with the increase of Tex, the macroscopic pull-out strength increases, and the failure mode evolves from break, pull-out, defiber. Under the same Tex, the interfacial bonding and integrity of alkali-resistant glass fiber bundles are better than those of basalt fiber bundles. According to the established method, the
Gc between the alkali-resistant glass fiber bundle and the matrix is about 318.7 % higher than that of the basalt fiber bundle, and the
Gc dispersion of different Tex in the same fiber is less than 13.6 %, which verifies the feasibility of the method in material comparison and parameter identification.