Study on the compatibility of modified magnesium hydroxide and sodium-based bentonite composite smoke-suppressing asphalt
To solve the poor compatibility of magnesium hydroxide in smoke-suppressing asphalt,magnesium hydroxide was surface modified by wet method using aluminate coupling agent,and sodium-based bentonite was added to enhance its smoke suppression performance.The optimal blending ratio of smoke-suppressing asphalt was determined through asphalt smoke testing device and three major index experiments.The microscopic mechanism of the composite smoke-suppressing asphalt was analyzed through scanning electron microscope experiments and Fourier transform infrared spectroscopy experiments.Finally,the modification effect of magnesium hydroxide was evaluated through particle size analysis,fluorescence microscope experiments,dispersion,and separation experiments.The results show that:the modified magnesium hydroxide and sodium-based bentonite have synergistic smoke suppression effects.The compatibility of the composite smoke-suppressing asphalt is better.Compared with magnesium hydroxide/sodium-based bentonite smoke-suppressing asphalt,the smoke suppression rate increased by 2.9％,the ductility increased by 2.5,and the softening point difference after 48 hours of storage decreased by 0.4 ℃.The compatibility and road performance of the modified magnesium hydroxide and sodium-based bentonite composite smoke-suppressing asphalt have been greatly improved compared with their respective single doping.
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