作　　者： ; ; ;

机构地区： 广州大学土木工程学院

出　　处： 《建筑材料学报》 2019年第3期363-370,共8页

摘　　要： 为了研究钢纤维(SF)、聚丙烯纤维(PPF)和粉煤灰(FA)这3种因素对C40级混杂纤维混凝土(HFRC)力学性能的影响,对HFRC的抗压强度、劈裂抗拉强度和轴心抗压强度进行了极差分析以及方差分析.结果表明:纤维的掺入能显著提高混凝土的劈裂抗拉强度,钢纤维、聚丙烯纤维和粉煤灰对混凝土劈裂抗拉强度的最大提升幅度分别为31.5%,5.4%和3.5%;纤维对混凝土抗压强度的增强效应不如对劈裂抗拉强度的增强效应显著.最后就3种因素对HFRC力学性能的影响进行了机理分析,建立了HFRC抗压强度、劈裂抗拉强度和轴心抗压强度的预测模型. In view of the influence of steel fiber(SF),polypropylene fiber(PPF) and fly ash(FA) on the mechanical properties of C40 hybrid fiber reinforced concrete(HFRC),orthogonal experimental design was carried out. Through the analysis of the extreme difference and the variance of the cube compressive strength,splitting tensile strength and axial compressive strength,the influence degree and significant factors of the three factors were obtained. The results show that the splitting tensile strength of concrete can be significantly improved by adding fiber,and the maximum increasing degree of steel fiber,polypropylene fiber and fly ash is 31.5%,5.4% and 3.5% respectively. Also the experimental data indicate that the enhancement effect of fiber on the compressive strength is less significant than that of splitting tensile strength. Then,the mechanism analysis of the influence of the three factors on the mechanical properties of HFRC is implemented. Finally,the prediction models of cube compressive strength,splitting tensile strength and axial compressive strength of HFRC are established.

关 键 词： 混杂纤维混凝土 力学性能 正交试验 机理分析 强度预测模型

领　　域： []