厂拌热再生SBS改性沥青优化设计方法研究

发布时间：2018-03-13 16:10

本文选题：道路工程　切入点：厂拌热再生　出处：《公路交通科技》2017年11期 　论文类型：期刊论文

【摘要】：为了合理地提高旧沥青混合料掺配比例、利于再生沥青路面技术的推广应用,提出了一种综合考虑再生沥青技术性能和经济效益指标要求的再生沥青优化设计方法。结合厂拌热再生SBS改性沥青路面工程,系统地测试了新、旧SBS改性沥青和再生剂不同掺配比例(旧沥青掺量占新旧沥青总量的0%,20%,30%,40%,100%;再生剂掺量占旧沥青的0%,4%,8%,12%)时的再生SBS改性沥青性能指标,并对比单一使用再生剂或新沥青再生与复合使用再生剂和新沥青再生两种测试结果发现,新沥青、再生剂都能够改善旧SBS改性沥青的性能,但单一再生的SBS改性沥青低温性能差,而应用复合再生方式能有效改善再生沥青的低温性能。为确定复合再生时旧沥青与再生剂掺量的合理范围,拟合了再生SBS改性沥青性能指标与旧沥青掺量、再生剂掺量的关系式,并计算了新SBS改性沥青混凝土路面费用与再生SBS改性沥青混凝土路面费用差值随旧沥青掺量、再生剂掺量的变化关系。根据再生SBS改性沥青技术指标要求,确定了旧沥青掺量和再生剂掺量的优化取值范围。指出一般情况下厂拌热再生SBS改性沥青混凝土路面费用明显低于新铺热拌SBS改性沥青混凝土路面费用,旧沥青混合料用量可达42%,突破了《公路沥青路面再生技术规范》的推荐范围。考虑再生沥青性能指标测试误差影响,剔除试验误差后旧沥青混合料用量为35.2%。
[Abstract]:In order to improve the mix proportion of old asphalt mixture reasonably and promote the application of recycled asphalt pavement technology, An optimum design method of recycled asphalt is presented, which considers the technical performance and economic benefit of recycled asphalt. The new method is tested systematically by combining with the engineering of regenerated asphalt pavement with hot regenerated SBS. The performance index of regenerated SBS modified asphalt with different blending ratio of old SBS modified asphalt and regenerative agent (20% of the total amount of new and old asphalt is 20% of the total amount of new and old asphalt), and the proportion of regenerating agent is 0% of old asphalt. Compared with the two kinds of test results, the new asphalt and the new asphalt can improve the performance of the old SBS modified asphalt, and the results show that the new asphalt and the regenerative agent can improve the performance of the old SBS modified asphalt, and the results show that the new asphalt can improve the performance of the new asphalt. However, the low temperature performance of SBS modified asphalt with single regeneration is poor, and the low temperature performance of recycled asphalt can be effectively improved by using compound regeneration method. The relationship between the performance index of recycled SBS modified asphalt and the amount of old asphalt and regenerative agent is fitted, and the difference between the cost of new SBS modified asphalt concrete pavement and the cost of regenerated SBS modified asphalt concrete pavement is calculated. According to the technical requirements of regenerated SBS modified asphalt, The optimum value range of the amount of old asphalt and regenerative agent is determined. It is pointed out that the cost of reclaimed SBS modified asphalt concrete pavement is obviously lower than that of new hot mix SBS modified asphalt concrete pavement in general. The amount of old asphalt mixture can reach 42%, which breaks through the recommended range of "Technical Specification for Asphalt pavement Regeneration". Considering the influence of test error on the performance index of recycled asphalt, the dosage of old asphalt mixture is 35.2g after eliminating the test error.
【作者单位】：长沙理工大学道路结构与材料交通行业重点实验室;湖南省通盛工程有限公司;
【基金】：国家自然科学基金项目(51178065) 湖南省交通科技计划项目(201504)
【分类号】：U414

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