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基于道路施工的路基填料-沥青改性研究

2021-04-27李响黄进进王柳殊李明军

粘接 2021年7期

李响 黄进进 王柳殊 李明军

摘 要:为了对基于道路施工的路基填料-沥青进行改性,考察了SBS、HV、SK90和KL70沥青与路基填料的交互作用。结果表明,随着填料体积百分数增加,沥青-填料复数剪切模量C逐渐减小,剪切模量系数G、爱因斯坦系数k和复数粘度系数η逐渐增加;相同填料体积分数下,沥青-填料的复数剪切模量C、剪切模量系数G和复数粘度系数η从大至小的顺序为:SBS>HV> SK90> KL70,愛因斯坦系数k从大至小的顺序为:KL70>SBS>HV>SK90。随着填料体积分数的增加,交互作用系数呈现逐渐减小的特征,填料关键体积分数从大至小顺序为KL>SK>HV>SBS。影响沥青-填料交互作用最明显的是沥青中的羟基和填料中的CaCO3。

关键词:道路施工;路基填料;沥青;种类;交互作用系数

中图分类号:U414 文献标识码:A 文章编号:1001-5922(2021)07-0124-04

Research on Subgrade Filler Asphalt Modification Based on Road Construction

Li Xiang, Huang Jinjin, Wang Liushu, Li Mingjun

(Sichuan Communication Surveying and Design Institute Co., Ltd., Chengdu 610000, China)

Abstract:In order to modify the subgrade filler asphalt based on road construction, interaction between SBS, HV, SK90 and KL70 asphalt and roadbed filler was investigated. The results show that the complex shear modulus C of asphalt filler decreases with the increase of filler volume fraction, while the shear modulus coefficient G, Einstein coefficient k and complex viscosity coefficient η increase gradually; Under the same filler volume fraction, the order of the complex shear modulus C, shear modulus coefficient G and complex viscosity coefficient η of asphalt-filler from large to small is: SBS>HV> SK90> KL70, and the Einstein coefficient k from large to small order: KL70 > SBS > HV > SK90. With the increase of filler volume fraction, the interaction coefficient shows a characteristic of gradual decrease. The order of the key volume fraction of filler is KL > SK > HV > SBS. The most obvious factors affecting the interaction between asphalt and filler are hydroxyl group in asphalt and CaCO3 in filler.

Key words:road construction; subgrade filling; asphalt; type; interaction coefficient

随着近年来城镇化的不断推进和国内交通运输行业的快速发展,道路等基建工程也迎来了巨大的发展机遇,如何在保障交通安全的前提下,尽可能提高道路路基的稳定性和质量,是道路施工从业人员关心的技术难题[1-2]。在道路施工过程中,沥青胶浆的性能主要受填料性质、填料体积分数以及填料与沥青之间的交互作用影响[3],而目前科研工作者大多从填料种类以及填料体积分数方面考察沥青-填料胶浆的力学性能,而对填料与沥青之间的交互作用影响及其作用机理方面的报道较少[4-5]。在此基础上,本文从交互作用角度出发,考察不同类型的沥青对沥青-填料的改性作用及对其交互作用的影响,以期为高综合性能的道路施工用路基填料的开发与应用提供参考。

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