摘要
研究了纤维掺量、石英砂粒径对纤维增韧水泥基复合材料流变性能、力学性能的影响。结果表明:通过纤维掺量与石英砂粒径的调整可以制备出早期韧性与延性优良,稳态开裂效果明显,28 d抗压强度、弹性模量分别达到90 MPa、30 GPa的高强纤维增韧水泥基复合材料;纤维掺量增大使得新拌浆体呈现出剪切变稀趋势,而石英砂粒径减小,则呈现出剪切增稠趋势;石英砂粒径较纤维掺量对试样力学性能影响显著,200目石英砂使得试样抗折强度出现降低的龄期由28 d延伸至60 d;微观分析发现试样中存在纤维磨损拔出及与附着产物一同拔出两种形式,且体系中石英砂粒径减小可以改善其界面过渡区性能。
The effects of fiber content and quartz sand particle size on rheological properties,mechanical properties of fiber reinforced cementitious composites were studied.The results showed that high strength fiber reinforced cementitious composites with excellent toughness and stable cracking effect at early stage can be obtained by adjusting the fiber content and particle size of quartz sand.The compressive strength and elastic modulus of the specimen reached 90 MPa,30 GPa respectively curing up to 28 days.With the increase of fiber content,the rheological properties of fresh paste showed shear thinning trend,while the grain size of quartz sand decreased,and the rheological properties changed to shear thickening trend.The particle size of quartz sand compared with fiber content has a significant effect on the mechanical properties of the specimen.The age at which the flexural strength began to decrease changed from 28 d to 60 d due to the 200-mesh quartz sand.Microscopic analysis found that abrasion pull-out and pull-out with adhesive products of fiber exist together in the specimen.And the performance of quartz sand interface transition zone was improved with the decreasing of particle size in the system.
作者
余保英
周建伟
孔亚宁
高育欣
杨文
程宝军
YU Baoying;ZHOU Jianwei;KONG Yaning;GAO Yuxin;YANG Wen;CHENG Baojun(China West Construction Academy of Building Materials,Chengdu 610094,China)
出处
《混凝土》
CAS
北大核心
2022年第4期72-77,共6页
Concrete
基金
国家重点研发计划“固废资源化”重点专项项目(2019YFC1907200)
中国住房和城乡建设部研究开发项目(2019-K-049)
中建股份科技研发计划资助(CSCEC-2019-Z-24)
中建西部建设科技研发计划资助项目(ZJXJ-2019-15)。
关键词
纤维增韧水泥基复合材料
纤维掺量
石英砂粒径
流变性能
fiber reinforced cementitious composites
fiber content
quartz sand particle size
rheological properties
作者简介
第一作者:余保英(1985-),女,硕士,工程师,主要从事先进水泥基材料研发工作。联系地址:四川省成都市天府新区煎茶街道文化路12号(610094)联系电话:13871124415。
