铁尾矿砂在沥青混合料中的试验研究

发布时间：2018-01-03 14:03

本文关键词：铁尾矿砂在沥青混合料中的试验研究　出处：《辽宁科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国钢铁工业的快速发展,铁尾矿砂的产量也在不断增加。大量的铁尾矿砂占用土地、堵塞河流、污染环境。而公路建设所需的材料却日益短缺,若能将铁尾矿砂作为筑路材料,不仅解决了筑路材料紧缺的问题,而且能减少存量和污染,改善环境,是节能环保的有益探索。本课题以鞍山地区齐大山铁尾矿砂为研究对象,首先对其物理性能进行研究,即通过筛分、密度等试验,测定其工程技术要求的级配组成、细度模数和表观密度等指标,经分析对比,发现其满足作为沥青混合料细集料的使用要求。为全面研究铁尾矿砂用于沥青混合料中的技术性能,本课题分别以90#道路石油沥青及SBS改性沥青作为胶结料,以碎石、石屑、铁尾矿砂、矿粉为矿质原材料,对AC-10、AC-13、AC-16、AC-20及AC-25五种类型的沥青混合料进行了试验研究与分析。运用配合比设计程序对每一类型的沥青混合料进行了矿料级配组成设计与优化,利用马歇尔试验,确定了每种类型的沥青混合料的最佳油石比。为了综合评价各种类型掺加铁尾矿砂的沥青混合料的路用性能,分别对每种型号的沥青混合料进行了马歇尔稳定度试验、浸水马歇尔试验及劈裂强度试验,以考察其高温稳定性、水稳定性及低温抗裂性,并将试验结果与规范要求相比较,考察各种类型掺加铁尾矿砂的沥青混合料的适用范围。最后,对掺加铁尾矿砂的沥青混合料和普通沥青混合料进行了经济分析和比较。研究表明,以90#道路石油沥青及SBS改性沥青为胶结料的五种型号的掺加铁尾矿砂的沥青混合料的路用性能、各项指标均能满足规范要求。其中掺加铁尾矿砂的沥青混合料的马歇尔稳定度甚至优于普通沥青混合料的马歇尔稳定度。对比规范要求,AC-10、AC-13及AC-16型掺加铁尾矿砂的沥青混合料流值在要求范围的高位,适用于夏热区及夏凉区,或可以在夏炎热区的中轻交通中使用,而AC-20及AC-25掺加铁尾矿砂的沥青混合料的流值在要求范围的低位,可以在夏炎热区中的重载交通情况下使用。每种型号的掺加铁尾矿砂的沥青混合料的残留稳定度均值都大于85%,甚至有大于90%的情况,可以在潮湿区使用。本课题对掺加铁尾矿砂的沥青混合料的系统研究为铁尾矿砂的综合利用提供了新的途径,开辟了新的思路。
[Abstract]:With the rapid development of iron and steel industry in China, the output of iron tailings is increasing. A large number of iron tailings occupy land, block rivers and pollute the environment. If the iron tailings can be used as road building materials, it can not only solve the shortage of road construction materials, but also reduce the stock and pollution, and improve the environment. This topic takes Qidashan iron tailings in Anshan area as the research object. Firstly, the physical properties are studied, that is, through screening, density and other tests. The gradation composition, fineness modulus and apparent density of the engineering technical requirements were measured and compared. It is found that it can meet the requirements of the use of fine aggregate of asphalt mixture. In order to comprehensively study the technical performance of iron tailings used in asphalt mixture. In this paper, 90# Road Asphalt and SBS modified Asphalt were used as binder respectively. AC-10AC-13AC-16 was used as mineral raw material, with gravel, stone debris, iron tailings and ore powder as mineral raw materials. Five types of asphalt mixture, AC-20 and AC-25, were tested and analyzed. Each type of asphalt mixture was designed and optimized by using the mix ratio design program. In order to evaluate the road performance of each kind of asphalt mixture with iron tailings, the optimum ratio of asphalt mixture is determined by Marshall test. Marshall stability test, immersion Marshall test and splitting strength test were carried out for each type of asphalt mixture to investigate its high temperature stability, water stability and low temperature crack resistance. The test results are compared with the requirements of the specification, and the applicable range of various types of asphalt mixture mixed with iron tailings is investigated. The economic analysis and comparison between asphalt mixture and ordinary asphalt mixture with iron tailings are carried out. The pavement performance of five kinds of asphalt mixture mixed with iron tailings with 90# road petroleum asphalt and SBS modified asphalt as binder. The Marshall stability of asphalt mixture with iron tailings is even better than that of ordinary asphalt mixture. The flow value of asphalt mixture of AC-13 and AC-16 type mixed with iron tailings is high in the required range, suitable for summer hot area and summer cool area, or can be used in medium and light traffic in hot summer area. The flow value of AC-20 and AC-25 mixed with iron tailings is low in the required range. It can be used in heavy load traffic in hot summer area. The average residual stability of each type of asphalt mixture with iron tailings is more than 85 or even more than 90%. The systematic study of asphalt mixture with iron tailings provides a new way for the comprehensive utilization of iron tailings and opens up a new way of thinking.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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