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通过高温(200～800℃)劈拉试验,测定124个纤维矿渣微粉混凝土(FRC-GGBFS)试件的劈拉强度和荷载—横向变形曲线,探讨温度、矿渣掺量、钢纤维掺量和聚丙烯纤维掺量对FRC-GGBFS的高温中劈拉强度和变形的影响,并通过不同温度下扫描电镜分析,探讨FRC-GGBFS的高温劣化过程。结果表明:随温度升高,FRC-GGBFS劈拉强度不断劣化,劈拉荷载—横向变形曲线渐趋扁平,韧性显著下降;矿渣微粉掺量为40%时,其对混凝土的高温中劈拉性能的改善最为显著;钢纤维显著提高了FRC-GGBFS的高温中劈拉强度和韧性;聚丙烯纤维能有效防止高温爆裂,其掺量为0.9 kg/m3时对FRC-GGBFS的高温中劈拉性能有明显改善。最后,建立了考虑温度、钢纤维体积率等影响的FRC-GGBFS高温中劈拉强度计算模型。
The splitting tensile strength and load-transverse deformation curves of 124 fiber slag concrete samples (FRC-GGBFS) were measured by high temperature (200 ~ 800 ℃) splitting tensile test. The effects of temperature, slag content, Propylene fiber content on the splitting tensile strength and deformation of FRC-GGBFS at high temperature, and explored the high temperature degradation process of FRC-GGBFS by scanning electron microscopy at different temperatures. The results show that the splitting tensile strength of FRC-GGBFS deteriorates with increasing temperature, the splitting load-transverse deformation curve becomes flat and the toughness decreases obviously. When the slag content is 40%, the splitting tensile strength Of the FRC-GGBFS was significantly improved. Steel fiber significantly increased the splitting tensile strength and toughness of the FRC-GGBFS at high temperature. Polypropylene fiber could effectively prevent the burst at high temperature. When the dosage was 0.9 kg / m3, Significant improvement. Finally, the calculation model of splitting tensile strength in FRC-GGBFS was established considering the influence of temperature and volume fraction of steel fiber.