Quantitative Analysis of Structural Changes of Asphalt Mastic with Curve-fitted of FTIR Spectrum in Salty High Temperature and High Humidity
ZHANG Qinling1,2, HUANG Zhiyi1
1 College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; 2 College of Water Conservancy and Architecture Engineering, Tarim University, Alar 843300, China
Abstract: In order to study the effects of high temperature and high humidity on the chemical composition of asphalt mastic in the coastal salt environment in south of China, the fourier transform infrared spectra (FTIR) of base- and SBS modified asphalt mastics at different salt concentrations(0%,5% and 10% by weight of water, respectively) were analyzed. In order to deeply analyze the absorption peak overlapping zone of 1 780—900 cm-1 wavenumbers in the asphalt mastics spectrum, the numbers and position of the overlapping sub-peaks were determined based on the second derivative, and the curve fitting analysis was performed on the superimposed band by Origin 2017 software. The effect of salt high temperature and high humidity environment on the chemical components of asphalt mastics were indirectly characterized by the area ratio of the sub-peak and the overlapping zone. The curve fitting results showed that the infrared index of base- and SBS asphalt mastics showed a consistent change with the increase of numbers of dry-wet cycles in different salt concentration, the values of sulfoxide indexes and aromatic indexes increased, and the aliphatic branch indexes, aliphatic index and butadiene indexes decreased. Because of the “salting out” effect of inorganic salts, the salt aggravate the ageing of asphalt mastics in water under the effect of dry-wet cycles. The SBS asphalt mastics shows better anti-agei-ng performance with a lower increase in sulfoxide index after ageing. The research results showed that FTIR technique combined with the curve fitting analysis method could reflect changes in internal chemical composition of asphalt mastics under the coupling effect of salt solution and dry-wet cycles, which also provided an effective method for evaluating the aging of asphalt materials in salt high temperature and humidity environment.
张勤玲, 黄志义. FTIR分峰拟合法定量分析沥青胶浆在含盐高温高湿环境中的结构变化[J]. 材料导报, 2020, 34(8): 8083-8089.
ZHANG Qinling, HUANG Zhiyi. Quantitative Analysis of Structural Changes of Asphalt Mastic with Curve-fitted of FTIR Spectrum in Salty High Temperature and High Humidity. Materials Reports, 2020, 34(8): 8083-8089.
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2020, Vol. 34 
