发泡剂对冷再生沥青混合料强度特性的影响  

Effects of foaming agent on strength characteristics of cold recycled asphalt mixture

作　　者：李强[1,2] 王锐军 李斌 许傲 商健林 赵曜 Li Qiang;Wang Ruijun;Li Bin;Xu Ao;Shang Jianlin;Zhao Yao(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China;Jiangsu Polaris Transportation Industry Group Co.,Ltd.,Nantong 226010,China;CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300461,China)

机构地区：[1]南京林业大学土木工程学院,南京210037 [2]江苏北极星交通产业集团有限公司,南通226010 [3]中交第一航务工程局有限公司,天津300461

出　　处：《东南大学学报（自然科学版）》2022年第2期282-287,共6页Journal of Southeast University：Natural Science Edition

基　　金：江苏省产学研合作资助项目(BY2021313);江苏省建设系统科技计划资助项目(2017ZD146);南京林业大学“青年骨干教师培养对象”资助项目。

摘　　要：为改善泡沫沥青发泡性能及其冷再生混合料强度,掺入不同种类发泡剂进行改性.采用沥青发泡试验、混合料力学试验、电镜扫描试验及红外光谱试验研究了发泡剂种类和质量分数对沥青发泡特性、冷再生沥青混合料强度及微观物化特性的影响.结果表明:发泡剂可有效提升发泡性能和再生混合料力学强度;随发泡剂质量分数的增加,各项性能均先提高后降低,最佳方案为掺入质量分数为0.5%的十六烷基三甲基溴化铵发泡剂,沥青膨胀率增大21.4%,半衰期延长1.1倍,再生混合料无侧限抗压强度、干劈裂强度、湿劈裂强度、低温抗弯拉强度和破坏应变分别提高14.7%、13.9%、29.0%、27.8%和31.4%;掺加发泡剂后,沥青膜对集料颗粒裹覆更充分,新生成的化学物质有助于提高泡沫沥青稳定性及其与旧料的黏附性能.To improve the foaming properties of foamed asphalt and the strength of the cold recycled asphalt mixtures, different types of foaming agents were incorporated for modification. The effects of foaming agent types and contents on the foaming properties, strength and microscopic physical-chemical properties of asphalt mixtures were investigated using asphalt foaming, mixture mechanical properties, electron microscope scanning and infrared spectroscopy tests. The results show that the foaming agent can effectively improve the foaming properties and the mechanical strength of the recycled mix. With the increase of the amount of the foaming agent, all the properties first increase and then decrease. The best solution is to mix the cetyl trimethyl ammonium bromide(CTAB) foaming agent with 0.5% of asphalt weight. The asphalt expansion rate increases by 21.4%, and the half-life extends by 1.1 times. The unconfined compressive strengths, dry and wet splitting tensile strength, low-temperature flexural strength of the recycled mix, and failure strain increase by 14.7%, 13.9%, 29.0%, 27.8%, and 31.4%, respectively. The addition of the foaming agent results in a more adequate coating of the aggregate particles by the asphalt film, and the newly generated chemical functional groups can improve the stability of the foamed asphalt and its adhesion to the recycled asphalt mixtures.

关 键 词：冷再生沥青混合料 泡沫沥青 发泡性能 力学强度 发泡剂 

分 类 号：U416.217[交通运输工程—道路与铁道工程]