混杂纤维改善轻骨料混凝土工作性和力学性能的研究  

Study on Hybrid Fibers Improve Workability and Flexural Strength of Lightweight Aggregate Concrete

作　　者：周杰 

机构地区：[1]武汉长信土木工程检测有限公司,武汉430064

出　　处：《建材世界》2013年第5期15-18,共4页The World of Building Materials

摘　　要：混杂纤维有良好的协同效应,可在不同的结构层次上发挥作用和优势互补。研究表明,当轻骨料混凝土中掺入一定量的混杂纤维(钢纤维与聚丙烯纤维)时,混凝土的流动性都会减少,扩展度也会降低。当轻骨料混凝土中钢纤维掺量为20kg/m3时,体系中随着聚丙烯纤维掺量的增加,混凝土的抗折强度有所提高,而混凝土的抗压强度和弹性模量呈下降趋势。当轻骨料混凝土中聚丙烯纤维掺量为0.8kg/m3时,体系中随着钢纤维掺量的增加,混凝土的抗折强度和弹性模量增幅明显,而混凝土的抗压强度呈现先增加后降低趋势,钢纤维适宜掺量为25kg/m3。Hybrid fiber has good synergistic effect, which has mutual promotion from different stages and levels. Results showed that when lightweight aggregate concrete incorporation with hybrid fiber （steel fiber and polypropylene fiber）, the concrete had lower flowability and slump flow. When steel fiber content of 20 kg/m3, with the increase of polypropylene fiber content, the flexural strength of concrete was improved and the compressive strength and elastic modulus of concrete was reduced. When polypropylene fiber content of 0. 8 kg/m3, with the increase of steel fiber con- tent, the lightweight aggregate concrete flexural strength and elastic modulus increases obviously, compressive strength increase firstly and then decreases and the optimum content of steel fiber was 25 kg/m3.

关 键 词：混杂纤维 混凝土工作性 抗折强度 弹性模量 

分 类 号：TU528.572[建筑科学—建筑技术科学]