Effect of silanized glass aggregates on moisture stability of asphalt mixtures
The glassphalt mixtures prepared by waste glass cullet(WGC)is prone to damage.In this study,we used a prefabricated 1 mol/L NaOH solution to chemically treat the WGC by immersion,and chemically modified it by using a pre-formulated aminopropyl triethoxysilane(AMEO)coupling agent hydrolysis solution.Using scanning electron microscopy,X-ray fluorescence spectroscopy,Fourier transform infrared spectroscopy,and particle size analyzer,the effects of chemical modification on the microstructure,chemical composition,molecular structure and particle size distribution of WGC were evaluated.Moreover,the freeze-thaw splitting and Marshall water-immersion tests were carried out to determine whether the chemical modification promotes the enhancement of glass asphalt's resistance to water.The results show that NaOH solution enhances the hydrophilicity and surface roughness of WGC,as well as promotes the organic modification of WGC with AMEO.Compared with WGC,NaOH/WGC makes the asphalt mixture loose in association after immersion with a low indirect tensile strength ratio,causing the immersed residual stability can not be tested and indirect tensile strength ratio only reaches 30.3%,while the immersed residual stability is recovered to 96.7%and the indirect tensile strength ratio is 76.7%after further chemical modification of NaOH/WGC with AMEO,demonstrating that the modification of WGC has significant capacity of improving glassphalt's resistance to the moisture-induced damage.
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