聚丙烯腈纤维调控水泥基充填材料凝结硬化与力学性能研究

Study on the Setting Hardening and Mechanical Properties of Polyacrylonitrile Fiber Regulated Cement-based Filling Materials

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摘要利用聚丙烯腈(PAN)纤维调控水泥基充填材料,对水泥基充填材料的凝结硬化时间、抗压强度、黏结强度、抗弯强度和抗拉强度进行了分析,研究了不同纤维掺量(0.5%、1%、1.5%)和不同长径比(100、200、300)的聚丙烯腈纤维对水泥基充填材料力学性能的影响。结果表明:当PAN纤维掺量为1.5%时,较CM组(不掺PAN纤维)的初凝和终凝时间分别降低了11.1%和5.7%;PAN纤维水泥基充填材料的抗压强度随着PAN纤维含量增加而降低。与CM组相比,当PAN纤维体积含量为0.5%、1.0%和1.5%时,抗压强度分别下降了13.0%、3.7%和7.4%;纤维掺量为1%、长径比为200的水泥基充填材料的抗弯强度较CM组增加了78.6%,增幅最大。水泥基充填材料的黏结强度和抗弯强度先增加,然后随着PAN体积掺量和长径比增加而降低;随着PAN纤维掺入,水泥基充填材料的抗拉强度有所提高,与CM组相比,PAN纤维水泥基充填材料的抗拉强度提高了36.4%~418.2%。 The setting and hardening time,compressive strength,bond strength,bending strength and tensile strength of cement-based filling materials were analyzed by using polyacrylonitrile(PAN)fiber.The effects of different fiber content(0.5%,1.0%,1.5%)and length to diameter ratio(100,200,300)on the mechanical properties of polyacrylonitrile fibers were studied.The results showed that when the content of PAN fiber was 1.5%,the initial coagulation time and the final coagulation time in CM group were reduced by 11.1%and 5.7%,respectively.The compressive strength of PAN fiber cement-based filling material decreases with the increase of PAN fiber content.Compared with CM group(PAN fiber is not blended),when the volume content of PAN fiber was 0.5%,1%and 1.5%,the compressive strength decreased by 13.0%,3.7%and 7.4%,respectively.The bending strength of cement-based filling material with fiber content of 1%and length-diameter ratio of 200 increased by 78.6%compared with CM group,and the grouth rate was the largest.The bonding strength and bending strength of cement-based filling materials increase first,and then decrease with the increase of PAN volume and length-diameter ratio.With the addition of PAN fiber,the tensile strength of cement-based filling material is improved,and the tensile strength of PAN fiber cement-based filling material is increased by 36.4%~418.2%compared with CM group.

作者谭琴戴勤友赵岩 TAN Qin;DAI Qinyou;ZHAO Yan(School of Intelligent Construction,Luzhou Vocational&Technical College,Luzhou 646000,China;School of Economics and Management,Hebei University of Architecture,Zhangjiakou 075000,China;Hebei Provincial Key Laboratory of Civil Engineering Diagnosis,Retrofit and Disaster Resilience,Zhangjiakou 075000,China;School of Mechanics and Architectural Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区泸州职业技术学院智能建造学院河北建筑工程学院经济管理学院河北省土木工程诊断、改造与抗灾重点试验室中国矿业大学(北京)力学与建筑工程学院

出处《金属矿山》 CAS 北大核心 2024年第9期283-288,共6页 Metal Mine

基金国家自然科学基金项目(编号:51878242)。

关键词充填材料聚丙烯腈纤维凝结硬化性能抗压强度抗弯强度黏结强度抗拉强度 filling material polyacrylonitrile fiber coagulation hardening performance compressive strength bending strength bond strength tensile strength