高温后混杂纤维增强人工砂混凝土力学性能试验研究  

Experiment research on mechanical properties of manufactured sand concrete reinforced with hybrid fiber after high temperature

作　　者：许安邦 徐炜圣 廖浩宇 周济 陈宗平 XU Anbang;XU Weisheng;LIAO Haoyu;ZHOU Ji;CHEN Zongping(Guangxi Limited Company of Tourism Development and Purchasing Industry Group,Nanning 530004,China;College of Civil Engineering and Architecture,Nanning University,Nanning 530200,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)

机构地区：[1]广西旅发置业集团有限公司,广西南宁530004 [2]南宁学院土木与建筑工程学院,广西南宁530200 [3]广西大学土木建筑工程学院,广西南宁530004

出　　处：《混凝土》2024年第7期99-104,共6页Concrete

基　　金：国家自然科学基金(51578163);八桂学者专项(桂政发【2019】79);南宁市科学研究与技术开发计划重大项目(20223024);广西重点研发计划资助项目(桂科AB21220012);广西科技基地和人才专项资助项目(桂科AD21075031)。

摘　　要：为研究高温后纤维增强人工砂混凝土的力学性能,以历经最高温度、人工砂取代率、纤维总掺量和纤维种类为变化参数,设计并完成了40个高温后纤维增强人工砂混凝土立方体试件的轴压试验。通过试验观察了试件烧失率变化和试件的破坏过程及形态,获取了试件应力应变曲线,重点分析了历经最高温度、人工砂取代率、纤维总掺量和纤维种类对纤维增强人工砂混凝土试件抗压强度及延性的影响规律。研究结果表明,对于不同历经最高温度,试件内部结构随温度升高而破坏严重,抗压强度及延性下降明显;对于不同人工砂取代率,50%取代率的试件有着相对最优的抗压强度和延性;对于不同的纤维总掺量,1.1%纤维总掺量的试件有着相对最优的抗压强度和延性;对于不同的纤维种类,在钢纤维掺量一定时,掺入玄武岩纤维可以提升试件的抗压强度,掺入聚丙烯纤维可以提升试件的延性。In order to study the mechanical properties of manufactured sand concrete reinforced with fiber after high temperature,the axial compression tests of 40 manufactured sand concrete reinforced with fiber specimens were designed and completed,took maximum temperature,manufactured sand replacement rate,fiber content and fiber types as variable parameters.The change of ignition loss and failure pattern of specimens were observed,the stress-stain curves were obtained.The effects of maximum temperature,manufactured sand replacement rate,fiber content and fiber types on the compressive strength and ductility of manufactured sand concrete reinforced with fiber specimens were analyzed.The results showed thatfor different maximum temperatures,the internal structure of the specimen was seriously damaged with the increase of temperature,and the compressive strength and ductility decrease significantly.For different manufactured sand displacement rate,specimens with 50%replacement rate have relatively optimal compressive strength and ductility.For different fiber content,specimens with 1.1%fiber content have relatively optimal compressive strength and ductility.For different fiber types,when the content of steel fiber was certain,the compressive strength of specimens can be improved by basalt fiber,and the ductility of specimens can be improved by polypropylene fiber.

关 键 词：高温 混杂纤维 人工砂混凝土 抗压强度 

分 类 号：TU528.572[建筑科学—建筑技术科学]