纤维改性水泥稳定铁尾矿砂的无侧限抗压性能研究  

Unconfined compressive properties of fiber modified cement stabilized iron tailings

作　　者：姜屏[1] 杨建冬 李娜[1] 钱健 JIANG Ping;YANG Jian-dong;LI Na;QIAN Jian(Shaoxing University,Shaoxing 312000,China)

机构地区：[1]绍兴文理学院,绍兴312000

出　　处：《复合材料科学与工程》2021年第8期73-79,共7页Composites Science and Engineering

基　　金：浙江省自然科学基金(LQ20E080005);河海大学岩土力学与堤坝工程教育部重点实验室开放基金项目(2019020)。

摘　　要：铁尾矿砂的资源化利用是降低尾矿库存风险和节约建筑材料的有效措施。分别采用聚丙烯纤维和玻璃纤维对水泥稳定铁尾矿砂(CIT)进行改性处理,其中纤维掺量分别为0、0.25%、0.5%、0.75%、1%,养护龄期分别为7 d和28 d。通过脆性指数、模强比、韧度指数三个力学性能指标表征纤维改性水泥稳定铁尾矿砂(FCIT),并通过扫描电镜(SEM)试验对纤维作用机制进行分析。研究结果表明:玻璃纤维的最优掺量为0.5%,而聚丙烯纤维的最优掺量为1%。在最优掺量的情况下,玻璃纤维和聚丙烯纤维对CIT无侧限抗压性能的作用基本一致。在相同纤维掺量的情况下,7 d养护龄期无侧限抗压强度和韧度指数低于28 d,不掺纤维时养护龄期对CIT的脆性指数作用不明显。纤维对CIT的作用机制可分为拉拔作用、交织作用和团聚作用。The resource utilization of iron tailings is an effective measure to reduce the risk of tailings inventory and save construction materials.Polypropylene fiber and glass fiber were used to modify cement stabilized iron tailings.The fiber content is 0,0.25%,0.5%,0.75%,1%,and the curing period is 7 days and 28 days,respectively.Fiber modified cement stabilized iron tailings(FCIT)was characterized by brittleness index,modulus strength ratio and toughness index.The mechanism of fiber was analyzed by SEM.The results show that the optimal content of glass fiber is 0.5%,while that of polypropylene fiber is 1%.Under the optimal dosage,the effect of glass fiber and polypropylene fiber on unconfined compressive properties of cement iron tailings is basically the same.Under the same fiber content,the unconfined compressive strength and toughness index of 7-day curing age are lower than that of 28 days,and the effect of curing age on the brittleness index of CIT is not obvious without fiber.The action mechanism of fiber on cement iron tailings can be divided into drawing,interweaving and agglomeration.

关 键 词：水泥稳定铁尾矿砂 聚丙烯纤维 玻璃纤维 无侧限抗压性能 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]