国产PVA/PE纤维混杂超高韧性水泥基复合材料拉压性能试验研究  

Experimental study on the tensile and compressive properties of domestic PVA/PE fibers hybrid reinforced ultra high toughness cementitious composite

作　　者：石玉成 李贺东 SHI Yucheng;LI Hedong(School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学建筑工程学院,浙江杭州310018

出　　处：《新型建筑材料》2024年第4期111-115,共5页New Building Materials

基　　金：国家自然科学基金资助面上项目(51978624);兵团重点领域科技攻关计划项目(2019AB016)。

摘　　要：研究分析了粉煤灰掺量、国产纤维掺量及混杂方式对超高韧性水泥基复合材料(UHTCC)抗压及直接拉伸性能的影响。结果表明:单掺PVA纤维/PE纤维或混杂使用都可制备出极限拉应变超3%的UHTCC;在相同的纤维混杂方案下(除单掺PVA),各配比抗压强度随粉煤灰掺量的增加整体呈逐渐下降的趋势;当PVA和PE纤维混杂使用时,UHTCC极限拉应变存在明显的正向混杂效应,混杂纤维UHTCC的极限拉应变均大于PVA-UHTCC和PE-UHTCC利用线性插值计算得到的极限拉应变;PVA-UHTCC拉伸失效后的裂缝宽度明显大于PE-UHTCC,当2种纤维混杂时,随着PE纤维掺量增加,裂缝宽度得到有效降低。In this paper,a series of tests were conducted to evaluate the influences of fly ash content,domestic PVA/PE fibers single-addition and their mixing ratio on the compressive and tensile properties of ultra high toughness cementitious composite(UHTCC).The experimental results showed that single doped with PVA/PE fibers or mixed use all could effectively provide UHTCC with an ultimate tensile strain of more than 3%.Under the same PVA/PE fibers’mixing ratio(except for PVA single-addition),the compressive strength of UHTCC showed a gradually decreasing trend as the amount of fly ash increased,there was an obvious positive hybrid effect on the ultimate tensile strain of UHTCC when PVA and PE fibers were used together.The ultimate tensile strain of UHTCC with hybrid fibers was greater than the ultimate tensile strain calculated by linear interpolation of PVA-UHTCC and PE-UHTCC.The crack width of PVA-UHTCC was significantly greater than PE-UHTCC and the crack width of hybrid fibers UHTCC decreased with the increase of PE fiber content.

关 键 词：超高韧性水泥基复合材料 纤维混杂 抗压性能 直接拉伸性能 

分 类 号：TU528[建筑科学—建筑技术科学]