LDHs耐紫外老化沥青的流变与化学性能研究  

Research on Rheological and Chemical Properties of LDHs Modified Bitumen

作　　者：刘星[1] 曾文博 付伟[1] 冯振中 

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430056 [2]西藏自治区交通运输厅,拉萨850000

出　　处：《建材世界》2017年第6期27-32,共6页The World of Building Materials

基　　金：西藏自治区交通科技项目(XZJTKJ[2015]01)

摘　　要：层状双羟基复合金属氢氧化物LDHs是一种紫外光阻隔材料。选用两种LDHs(Mg-Al-LDHs和Zn-AlLDHs)采用熔融共混法制备LDHs耐老化沥青,利用动态剪切流变仪(DSR)、棒状薄层色谱-氢火焰离子探测仪(TLC-FID)、傅立叶变换红外光谱仪(FTIR)及紫外光分光光度计(UV-Vis)探究LDHs耐老化沥青的流变与化学性能,从而揭示LDHs的抗紫外老化机理。研究结果表明:在波长220~400nm范围内,Zn-Al-LDHs比Mg-Al-LDHs具有更大的反射率,两种LDHs的加入对沥青的性能影响不同,Mg-Al-LDHs对沥青的动态流变性能影响较大,而Zn-Al-LDHs对沥青的紫外老化性能影响较大,因此,Zn-Al-LDHs具有更好的抗紫外老化效果。Layered double hydroxides(LDHs)is an ultraviolet-light(UV)resistant material.In this study,two types of LDHs(Mg-Al-LDHs and Zn-Al-LDHs)were applied to modify the bitumen by melt blending.Effect of ultraviolet ageing on rheology and chemistry of LDHs modified bitumen was studied,by means of dynamic shear rheometer(DSR),thin-layer chromatography with flame ionization detection(TLC-FID),Fourier transform infrared spectroscopy(FTIR)and UV-Vis spectrophotometer,to reveal the mechanisms of action for LDHs and bitumen.The results showed that within the UV spectra(220~400 nm),the reflectance of Zn-Al-LDHs was larger than that of Mg-Al-LDHs.These two LDHs have different influences on the performance of bitumen.Mg-Al-LDHs had more obvious influence on the dynamic rheological properties of bitumen than Zn-Al-LDHs.Zn-Al-LDHs more improved the UV-ageing resistance of bitumen.The reason can be that the reflectance of Zn-Al-LDHs to the UV-light is larger than that of Mg-Al-LDHs.The Zn-Al-LDHs modified bitumen had more potential to improve the UV-ageing resistance during the service life of asphalt pavement.

关 键 词：LDHS 沥青 紫外老化 流变性能 化学性能 

分 类 号：U414[交通运输工程—道路与铁道工程]