中文摘要：

基于正交设计研究多因素对玄武岩纤维（BF）增强混凝土（BFRC）力学性能的影响并优化其配合比。选取BF长度、BF掺量、减水剂、速凝剂作为试验因素,通过极差分析得出各因素权重关系。利用SEM观察BFRC微观结构,分析BF对混凝土增强的微观机理。结果表明,BF掺量为3kg/m3时,抗压、抗折强度最大,掺量继续增大,抗压、抗折强度均明显下降;抗压、抗折强度随BF长度增大先上升后下降,长度30mm时最佳;减水剂、速凝剂较前者相比对BFRC力学性能影响不明显。各因素对BFRC 7d抗压与抗折强度影响权重一致,均为BF掺量〉BF长度〉减水剂〉速凝剂,对BFRC 28d抗压、抗折强度影响权重分别为BF长度〉BF掺量〉速凝剂〉减水剂及BF长度〉BF掺量〉减水剂〉速凝剂。当纤维长度为30mm、纤维掺量为3kg/m3、减水剂为0.7%、速凝剂为10%时,BFRC相对于素混凝土的28d抗压和抗折强度分别提高了21.7%和37.8%。

英文摘要：

Based on the orthogonal design, the influence of multi factors on the mechanical properties of BFRC was studied and the mixture ratio was optimized. The BF length, BF content, water reducing agent and accelerator were selected as the factors, and the weight relation of each factor was obtained by range analysis. The microstructure of BFRC was observed by SEM, and the micro mechanism of BF on concrete was analyzed. The results show that when the dosage of BF is 3kg/m3, the maximum compressive flexural strength are obtained, then the compressive strength and flexural strength both decrease when the dosage of BF increases. The compressive strength and flexural strength increase first and then decrease with the length of BF increases, and the best length of BF is 30ram. The reducing agent and accelerating agent have little effect on the mechanical properties of the BFRC. The influence of various factors on the 7d compressive and flexural strength of BFRC is consistent： BF dosage 〉BF length 〉 water reducing agent 〉 accelerator. The influence of various factors on the 28d compressive and flexural strength is BF length 〉BF dosage 〉 accelerating agent 〉 water reducing agent and BF length 〉BF dosage 〉 water reducing agent 〉 accelerator respectively. When the fiber length is 30mm and the fiber content is 3kg/m3, the water reducing agent is 0.7%, the accelerator is 10%, the 28d compressive and flexural strength of BFRC compared with plain concrete were increased by 21.7% and 37.8%.