超高强复合水泥基掺入料对抗压强度及疲劳性能影响研究  

Study on the impact of ultra-high strength composite cement base admixture on compressive strength and fatigue performance

作　　者：廖坤阳[1] LIAO Kunyang(Fujian Vocational College of Forestry,Nanping 353000,China)

机构地区：[1]福建林业职业技术学院,福建南平353000

出　　处：《混凝土》2020年第5期79-82,89,共5页Concrete

基　　金：福建省中青年教师教育科研项目(JAT160743)。

摘　　要：为了探究超高强水泥基复合材料力学及收缩性能,研究了超高强复合水泥基材料的收缩性能及力学表现,从抗压强度、抗折强度、体积收缩率及疲劳性能进行分析,得到不同硅粉掺加量和不同种类纤维及其掺加量对超高强复合水泥基材料的力学性能影响,对不同种类纤维及硅粉掺合料的配合比进行优化.结果表明,两种纤维及硅粉掺入水泥基材料后,收缩及力学性能得到明显改善,钢纤维对水泥基复合材料抗压及抗折强度提升较突出,但碳纤维与硅粉及水泥基材料相容性较好.纤维掺入体量为1%的碳纤维及1.5%的钢纤维对水泥基复合材料综合性能改善效果最佳,其抗压强度分别提高2.7%、3.0%,抗折强度分别提高21.2%、12.6%,体积收缩率分别降低3.5%、12.2%;且掺加1.5%钢纤维的水泥基复合材料相较于未掺加材料疲劳性能提升约4倍,最大跨中挠度阶段性特征变现显著;掺入8%硅粉相较于纤维改善效果最佳,其抗压、抗折强度分别提升10.4%、13.3%,体积收缩率降低了28.8%。To explore ultra high strength cement base composite materials mechanics and shrinkage performance,studies the super-high strength composite cement base material shrinkage performance and mechanical performance,compressive strength,flexural strength,volume shrinkage ratio and fatigue performance were analyzed,and get a different silicon powder adding quantity and different types of fiber and its adding amount on the mechanical property of high strength composite cement base material,the different types of fibers and silicon powder admixture ratio were optimized.The results show that the shrinkage and mechanical properties of the two kinds of fibers and silicon powder are obviously improved after adding cement-based materials.Carbon fiber and steel fiber with fiber incorporation volume of 1%and 1.5%have the best effect on the comprehensive performance improvement of cement matrix composites.The compressive strength increases by 2.7%and 3.0%respectively,the flexural strength increases by 21.2%and 12.6%respectively,and the volume shrinkage decreases by 3.5%and 12.2%respectively.In addition,the fatigue performance of cement matrix composites mixed with 1.5%steel fiber is about 4 times higher than that of unmixed materials,and the maximum mid-span deflection stage features are obvious.Compared with the fiber,adding 8%silica powder has the best improvement effect,its compressive strength and flexural strength increased by 10.4%and 13.3%respectively,and the volume shrinkage rate decreased by 28.8%.

关 键 词：纤维 复合水泥基 超高强 力学性能 抗压强度 

分 类 号：TU528.041[建筑科学—建筑技术科学]