聚丙烯纤维混凝土强度正交试验研究  

Orthogonal Test Study on Strength of Polypropylene Fiber Concrete

作　　者：黄鑫 庞建勇[1] 黄金坤[1] 陈小芳[1] HUANG Xin;PANG Jian-yong;HUANG Jin-kun;CHEN Xiao-fang(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,淮南232001

出　　处：《硅酸盐通报》2019年第4期1183-1190,共8页Bulletin of the Chinese Ceramic Society

基　　金：淮南市科技计划重大创新平台及创新人才团队专项(2017A055);安徽省高校自然科学重大项目(KJ2015ZD20)

摘　　要：利用正交试验对聚丙烯纤维混凝土(以下简称纤维混凝土)的强度进行试验,研究了聚丙烯纤维长度、水泥用量、砂率以及水灰比对纤维混凝土28 d的抗压强度、劈裂抗拉强度以及抗折强度的影响规律,并对试验结果进行系统分析。结果表明,水灰比对于抗压、抗拉以及抗折强度均是最为显著的影响因素,三种强度均随着水灰比的增加而减小;纤维长度对于抗拉强度有明显的提高作用,其最佳取值范围在10～19 mm范围内;砂率对于混凝土抗压和抗折强度的影响要大于其对抗拉强度的影响;水泥用量对于劈裂抗拉强度的贡献率最低;纤维长度为19 mm,水灰比为0. 47时对混凝土强度的影响权重最大;根据功效系数法的评分可知,对于抗压、抗拉以及抗折强度的最佳配比组合为A_3B_3C_2D_1,即聚丙烯纤维长度为25 mm,水泥用量为425 kg/m^3,砂率为55%,水灰比为0. 47,对配比最佳组的试件进行微观分析,结果表明,聚丙烯纤维对于混凝土强度增强起到了锚固、桥接以及牵拉的作用。Orthogonal test method was applied to analyze the strength properties of polypropylene fiber concrete(hereinafter referred to asfiber concrete). The effect of the length of polypropylene fiber, cement content,sand ratio and water-cement ratio was investigated on the 28 d cube compressive strength,splitting tensile strength and flexural strength. Test results show that water-cement ratio is the most significant factor for compressive, tensile and flexural strength and these indicators decrease with the increase of water-cement ratio. The fiber strength has a significant effect on the tensile strength and the optimum range of fiber length is 10-19 mm. The influence of sand ratio on concrete compression and flexural strength is greater than its impact on tensile strength. The cement content has the lowest contribution rate to splitting tensile strength. When the fiber length is 19 mm and the water-cement ratio is 0.47, the effect weight of the concrete strength is the largest. According to the scoring of the efficacy coefficient method, the best ratio combination for compressive, tensile and flexural strength is A 3B 3C 2D 1, that is, the length of the polypropylene fiber is 25 mm, the cement content is 425 kg/m^3, the sand ratio is 55%, and the water-cement ratio is 0.47. Microscopic analysis of the specimens with the best ratio showed that the polypropylene fibers provide anchoring, bridging and pulling effects for concrete strength enhancement.

关 键 词：聚丙烯纤维 正交试验 强度 最佳配比 微观分析 

分 类 号：TU53[建筑科学—建筑技术科学]