亚高温作用对钢-PE混杂纤维水泥基复合材料压缩性能的影响  

Experimental Study on Static Compression of Steel-PE Hybrid Fiber Cement-based Composites after High Temperature

作　　者：吴楚奇 李亮[1] 李正鹏 吴俊 顾珑 WU Chu-qi;LI Liang;LI Zheng-peng;WU Jun;GU Long(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing,100124,China;School of Civil Engineering,Shanghai Normal University,Shanghai,201418,China;Resettlement Housing Support Center,Logistics Support Department of Central Military Commission,Beijing,100036,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]上海师范大学建筑工程学院,上海201418 [3]中央军委后勤保障部安置住房保障中心,北京100036

出　　处：《建材技术与应用》2024年第4期46-53,共8页Research and Application of Building Materials

基　　金：国家自然科学基金面上项目(52278474);国家自然科学基金面上项目(52078288);北京工业大学城市与工程安全减灾教育部重点实验室开发基金重点项目。

摘　　要：为研究亚高温作用对钢-聚乙烯混杂纤维水泥基复合材料(S/PE-HFRECC)压缩性能的影响,开展了其经历亚高温冷却后的静态压缩试验。以控制纤维体积总掺量为2%并改变两种纤维掺量的方式,将钢纤维和PE纤维混杂掺入水泥基材料中,制成PE2、S0.5PE1.5、S1PE1、S1.5PE0.5和S2类型的试件。对经不同温度作用后的各纤维配比试件静态压缩试验结果进行分析,结果表明:(1)钢纤维主要发挥增强作用,PE纤维主要发挥增韧作用。(2)当试验温度在200℃及以下时,试件的静态抗压强度不会因温度的上升而有明显变化;在300℃时,各类试件的静态抗压强度均有不同程度的提升,其中S1.5PE0.5和S2试件的抗压强度最高;在400℃时,除S2试件外其他试件的抗压强度均存在下降现象。(3)各类型试件的峰值应变均随温度升高逐渐增大。当温度相同时,各类型试件的峰值应变与PE纤维的掺量呈正相关,说明PE纤维的加入能提高试件的变形能力。(4)S2试件的应力峰值前韧度随着温度的升高而升高,其他试件随着温度的升高表现为先增大后减小的趋势;S2试件在400℃时应力峰值前韧度达到最大值,其他试件则在300℃时韧度最大;当温度≯300℃时,S1.5PE0.5的试件应力峰值前韧度高于其他试件。In order to study the effect of subhigh temperature on the compression properties of steel-polyethylene hybrid fiber cement composite(S/PE-HFRECC),static compression tests were carried out after subhigh temperature cooling.PE2,S0.5PE1.5,S1PE1,S1.5PE0.5 and S2 samples were made by mixing steel fiber and PE fiber into cement-based materials by controlling the total fiber volume content to 2%and changing the two fiber content.The static compression test results of the samples with different fiber ratios were analyzed,and the results showed that:(1)Steel fiber mainly played the role of strengthening,PE fiber mainly played the role of toughening.(2)When the test temperature was 200℃or below,the static compressive strength of the specimen would not change significantly due to the rise of temperature.At 300℃,the static compressive strength of all kinds of specimens increased to different degrees,and the compressive strength of S1.5PE0.5 and S2 specimens was the highest.At 400℃,the compressive strength of all specimens except S2 decreased.(3)The peak strain of all types of specimens increased gradually with the increase of temperature.When the temperature was the same,the peak strain of each type of specimen was positively correlated with the PE fiber content,indicating that the addition of PE fiber can improve the deformation capacity of the specimen.(4)The toughness before the stress peak of S2 specimen increased with the increase of temperature,while other specimens showed a trend of first increasing and then decreasing with the increase of temperature.The toughness of S2 specimen reached the maximum before the stress peak at 400℃,while the toughness of other specimens reached the maximum at 300℃.When the temperature was more than 300℃,the toughness before the stress peak of S1.5PE0.5 specimen was higher than that of other specimens.

关 键 词：钢-PE混杂纤维水泥基复合材料 亚高温 抗压强度 峰值应变 韧性 

分 类 号：TU528[建筑科学—建筑技术科学]