温拌剂对再生沥青与沥青混合料性能影响及作用机理  

Influence and Mechanism of Warm Mix Agent on Performance of Recycled Asphalt and Asphalt Mixture

作　　者：仰建岗[1] 黄锦化 高杰 姚玉权 罗露花 YANG Jian-gang;HUANG Jin-hua;GAO Jie;YAO Yu-quan;LUO Lu-hua(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang Jiangxi 330013,China;School of Transportation Engineering,East China Jiaotong University,Nanchang Jiangxi 330013,China;School of Highway,Chang’an University,Xi’an Shaanxi 710064,China;Jiangxi Tianchi Expressway Technology Development Co.,Ltd.,Nanchang Jiangxi 330103,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]华东交通大学交通运输工程学院,江西南昌330013 [3]长安大学公路学院,陕西西安710064 [4]江西省天驰高速科技发展有限公司,江西南昌330103

出　　处：《公路交通科技》2023年第7期1-10,共10页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(52268068);江西省教育厅青年科学基金项目(GJJ210623);福建省交通运输科技项目(201901GS)。

摘　　要：为研究Sasobit温拌剂对再生沥青及再生沥青混合料性能的影响,分析其作用机理。通过动态剪切流变试验、弯曲梁流变试验测试了不同温拌剂掺量下沥青高、低温流变性能。采用马歇尔试验分析了温拌剂对再生沥青混合料压实温度的影响。结合水敏感性试验、车辙试验及低温弯曲试验分析了温拌剂掺加前后再生沥青混合料路用性能的变化规律。采用傅里叶变换红外光谱分析了温拌剂在再生沥青中的作用机理。结果表明:Sasobit温拌剂掺量增加可以改善再生沥青抗变形能力以及抗荷载变形程度,而抗疲劳开裂以及低温抗裂性则反之,对再生沥青抗永久变形能力影响不明显;当沥青混合料回收料(RAP)掺量为40%时,以4%为目标空隙率添加老化沥青质量3%的Sasobit温拌剂,可使热拌再生沥青混合料压实温度降低20~30℃;相同RAP掺量下,使用Sasobit温拌剂的再生沥青混合料的水稳定性、低温抗裂性均低于普通热拌再生沥青混合料,而高温稳定性则反之;Sasobit温拌剂的使用不会改变再生沥青中羰基与亚砜基振动幅度,表明其在再生沥青中不发生化学反应,对再生沥青混合料降温的效果属于物理降黏作用;Sasobit温拌剂不能恢复老化沥青中已经降解的SBS改性剂性能;Sasobit温拌剂能够影响再生沥青混合料高、低温性能以及水稳定性,工程使用中应综合考虑路用性能与压实温度之间的平衡确定合理的温拌剂掺量。To study the influence of the Sasobit warm mix agent on the performance of recycled asphalt and recycled asphalt mixture as well as the mechanism of warm mix agent,the high and low temperature rheological characteristics of the asphalts with different of warm mixing agent contents are tested by using the dynamic shear rheological test and flexural beam rheological test.The influence of the warm mixing agent on the compaction temperature is analyzed by using the Marshall test.The change of road performance of recycled asphalt mixture before and after adding the warm mix agent is analysed by using water sensitivity test,rutting test and low temperature bending test.The mechanism of warm mix agent in recycled asphalt is analysed by FTIR.The result shows that(1)increasing the content of Sasobit warm mix agent can improve the deformation resistance and load deformation resistance of recycled asphalt,but the fatigue cracking resistance and low temperature crack resistance are on the contrary,which has no obvious influence on the permanent deformation resistance of recycled asphalt;(2)when the content of recycled asphalt mixture(RAP)is 40%,adding Sasobit warm mix agent at content of 3%with target porosity of 4%can reduce the compaction temperature of hot mixed recycled asphalt mixture by 20-30℃;(3)with the same content of RAP,the moisture stability and the low temperature crack resistance of warm mix recycled asphalt mixture using Sasobit warm mix agent are lower than those of conventional hot mix recycled asphalt mixture,while the high-temperature stability is on the contrary;(4)the use of Sasobit warm mix agent will not change the vibration amplitude of carbonyl and sulfoxide groups in recycled asphalt,indicating that it does not undergo chemical reaction in recycled asphalt and its cooling effect on recycled asphalt mixture belongs to the physical viscosity reducing effect;(5)Sasobit warm mix agent cannot restore the performance of SBS modifiers that have already degraded in aged asphalt;(6)Sasobit warm mix agent c

关 键 词：道路工程 再生沥青混合料 流变试验 Sasobit温拌剂 路用性能 机理 

分 类 号：U416.2[交通运输工程—道路与铁道工程]