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.
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)
