摘要
该研究探讨了采用硅烷偶联剂对再生粗集料进行强化处理的可行性,重点分析了硅烷偶联剂改性前后再生集料的吸水率、表观相对密度、压碎值和洛杉矶磨耗损失及其沥青混凝土的高温性能.结果表明,硅烷偶联剂改性后的再生集料,吸水率、表观相对密度、压碎值和洛杉矶磨耗损失分别为 0.7%、2.612、24.1%和 25.5%,满足《公路沥青路面施工技术规范》(JTG F40-2004)对粗集料技术性质的要求.对于采用改性再生粗集料制备的沥青混凝土,当轮压从 0.7MPa提升至 0.9MPa时,其车辙深度增加了 90.4%,动稳定度则下降了 48.8%.因此,硅烷偶联剂改性再生粗集料不宜在重载交通环境下使用.
Abstract
This study explores the feasibility of using silane coupling agent to strengthen the recycled coarse aggre-gate,with a focus on analyzing the water absorption,apparent relative density,crushing value,Los Angeles abrasion loss of recycled coarse aggregate,and high-temperature performance of its asphalt concrete before and after modification with silane coupling agent.Results show that recycled aggregate modified with silane coupling agent has a water ab-sorption,apparent relative density,crushing value,and Los Angeles abrasion loss of 0.7%,2.612%,24.1%,and 25.5%,respectively,which meet the requirements of the Technical Specification for Construction of Highway Asphalt Pavement(JTG F40-2004)for the technical properties of coarse aggregate.For asphalt concrete prepared with modi-fied recycled coarse aggregate,when the tire pressure is increased from 0.7 MPa to 0.9 MPa,the rutting depth increa-ses by 90.4%and the dynamic stability decreases by 48.8%.Therefore,silane coupling agent modified recycled coarse aggregate is not suitable for use in heavy traffic environments.
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