铁尾矿沥青混凝土混合料的路用特性研究  

Research on Road Usage Characteristics of Iron Tailings Asphalt Concrete Mixture

作　　者：程和平[1] 陆璐 CHENG Heping;LU Lu(Institute of Construction Engineering Technology,Changzhou Vocational Institute of Engineering,Changzhou 213164,China;School of Civil Engineering,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]常州工程职业技术学院建筑工程学院,江苏常州213164 [2]辽宁工程技术大学土木工程学院,辽宁阜新123000

出　　处：《金属矿山》2022年第3期232-236,共5页Metal Mine

摘　　要：为探究不同铁尾矿掺量下沥青混凝土的路用特性,以齐大山铁尾矿部分替代天然砂为细骨料,考察了铁尾矿掺量对沥青混凝土混合料软化点、高温稳定性、冻融劈裂、抗车辙性以及低温抗裂性的影响。结果表明:①随着铁尾矿掺量的增大,试样软化点先增大后趋于稳定,动稳定度先升高后降低,铁尾矿掺量为20%时沥青混凝土混合料的软化点及动稳定度最高,分别达56℃、5292次/mm。②随着铁尾矿掺量的增大,试样最大弯曲应变先减小后增大,抗弯强度逐渐增大;最大弯曲应变值在铁尾矿掺量为30%时达到了最低,且此时试样的性能基本能够满足路面性能的要求。③随着铁尾矿掺量的增大,试样抗车辙因子先增大后略微降低,铁尾矿掺量为20%时达到最大值。④随着冻融循环次数的增加,试样劈裂强度比逐渐降低;在同一冻融循环次数作用下,随着铁尾矿掺量的增大,沥青试样的劈裂强度比呈现出先增大后减小的趋势。综合铁尾矿沥青混凝土试验结果可知,当铁尾矿掺量为20%~30%时,沥青混凝土的各项指标可达到最佳。In order to explore the pavement characteristics of asphalt concrete with different iron tailings addition,the influence of iron tailings addition on the softening point,high temperature stability,freeze-thaw splitting,rutting resistance and low temperature cracking resistance of asphalt concrete mixture were investigated by using Qidashan iron tailings to partially replace natural sand as fine aggregate.The results showed that:①With the increase of iron tailings addition,the softening point of the sample increases first and then becomes stable,and the dynamic stability increases first and then decreases.When the iron tailings addition is 20%,the softening point and dynamic stability of the asphalt concrete mixture are the highest,reaching 56℃and 5292 times/mm,respectively.②With the increase of iron tailings addition,the maximum bending strain decreases first and then increases,and the bending strength increases gradually.The maximum bending strain value reaches the lowest when the iron tailings addition is 30%,and the performance of the sample can basically meet the requirements of pavement performance.③With the increase of iron tailings addition,the rutting resistance factor increases first and then slightly decreases,and reaches the maximum value when the iron tailings content is 20%.④With the increase of the number of freeze-thaw cycles,the splitting strength ratio decreases gradually.Under the same number of freezing-thawing cycles,the splitting strength ratio of asphalt samples increases first and then decreases with the increase of iron tailings addition.Based on the test results of iron tailings asphalt concrete,the indicators of asphalt concrete can reach the best when the iron tailings content is 20%~30%.

关 键 词：铁尾矿掺量 高温稳定性 低温抗裂性 冻融劈裂 抗车辙性 劈裂强度比 

分 类 号：TU421[建筑科学—岩土工程]