老化SBS改性沥青再生与机理分析

发布时间：2018-04-10 01:26

本文选题：道路工程　切入点：再生方法　出处：《长安大学学报(自然科学版)》2017年03期

【摘要】：为了探究老化SBS改性沥青的有效再生措施,设计2种方案对3种不同老化程度的SBS改性沥青进行再生,方案1为添加再生剂或基质沥青,方案2为添加再生剂+SBS类改性沥青。采用针入度、延度及反映SBS与基质沥青交联作用强弱的韧性SBC指标评价其再生效果,并通过微观相态结构、红外光谱及凝胶渗透色谱分析,探究老化沥青再生的微观机理。研究结果表明:添加再生剂或基质沥青后,老化沥青中沥青质和C滢O基团含量减少,胶质和轻质组分含量增大,沥青的针入度和延度增大,但SBS与基质沥青间的交联作用无法恢复,韧性SBC改善效果不明显,甚至因为再生剂和基质沥青的软化作用,导致轻度老化沥青的韧性SBC降低;对于老化较严重的SBS改性沥青,在添加再生剂的基础上,添加SBS类改性沥青后,沥青质和C滢O基团含量进一步减少,胶质含量增大,而轻质组分含量略有减少,使得针入度降低,而延度增大,SBS与基质沥青间的交联作用也因为SBS改性剂的补充而恢复,韧性SBC大幅度提高。与SBS改性沥青相比,添加高黏度沥青后,再生沥青的针入度较小,延度和韧性SBC较大,因此,在进行轻度老化SBS改性沥青再生时,不宜添加过多的再生剂或基质沥青,否则会使沥青软化,SBS与基质沥青间的交联作用减弱,韧性降低;对于老化较严重的SBS改性沥青,宜采用添加再生剂+SBS类改性沥青的方法进行再生,使其针入度、延度和韧性尽量接近原样SBS改性沥青的水平。
[Abstract]:In order to explore the effective regeneration measures of aging SBS modified asphalt, two schemes were designed to regenerate three kinds of SBS modified asphalt with different aging degree. Scheme 1 is to add regenerating agent or matrix asphalt, and scheme 2 is to add regenerating agent SBS type modified asphalt.The regeneration effect was evaluated by penetration, ductility and ductile SBC index reflecting the strong and weak cross-linking action between SBS and matrix asphalt. The microcosmic mechanism of aging asphalt regeneration was investigated by means of microstructure, infrared spectrum and gel permeation chromatography.The results showed that the contents of asphaltene and C _ (- O) groups in aging asphalt decreased, the contents of colloid and light components increased, and the penetration and ductility of asphalt increased after the addition of regenerating agent or matrix asphalt.However, the crosslinking effect between SBS and matrix asphalt can not be restored, and the improvement effect of ductile SBC is not obvious, even because of the softening effect of regenerator and matrix asphalt, the ductile SBC of mildly aged asphalt decreases.On the basis of the addition of regenerative agent, the content of asphaltene and C'-O group decreased further, the content of colloid increased, and the content of light component decreased slightly after adding SBS modified asphalt, which resulted in the decrease of penetration.The crosslinking effect between SBS and base asphalt was improved with the increase of ductility, and the toughness of SBC was improved greatly by the supplement of SBS modifier.Compared with SBS modified asphalt, the penetration of recycled asphalt is smaller, the ductility and ductility of SBS modified asphalt is larger than that of SBS modified asphalt, so it is not advisable to add too much regenerating agent or base asphalt in the process of mild aging SBS modified asphalt.Otherwise, the crosslinking effect between softened asphalt and base asphalt will be weakened, and the toughness will be decreased. For SBS modified asphalt with severe aging, the method of adding regenerating agent SBS type modified asphalt should be used to regenerate it to make its penetration.Ductility and toughness as close as possible to the original SBS modified asphalt level.
【作者单位】：同济大学道路与交通工程教育部重点实验室;上海公路桥梁(集团)有限公司;
【基金】：安徽省合肥市重点工程建设管理局项目(2012CGAZ1726)
【分类号】：U414

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