Performance of mixtures of epoxy asphalt and steel slag and its composition optimization
The mixtures of epoxy asphalt and steel slag with different dosages of epoxy resin(EP)and unaged steel slag coarse aggre-gate(WSS)were prepared,and road performance tests were utilized to investigate the effects of changes in material composition on the performance of the mixtures.At the same time,the mechanism analysis was carried out in conjunction with microscopic tests,and the asphalt mixtures composition was optimized.The results showed that WSS adsorbed more asphalt and formed a thicker asphalt film than basalt due to the high surface roughness and alkaline properties,and the increase of WSS dosage helped to improve the water stability and low-temperature cracking resistance of the mixture when the EP dosage was constant.The EP had excellent thermosetting and adhe-sion characteristics,even at low EP dosage could also be a good inhibition of the volume expansion of the mixtures.With the increase of EP dosage,the comprehensive road performance of the mixtures was significantly improved.When the EP dosage reached more than 15％,the cured EP aggregated into large irregular particles and dispersed in the epoxy asphalt,which improved the road performance of the mixtures and realized the 100％substitution of WSS for basalt coarse aggregate.For the comprehensive performance and cost factors,it was recommended to use 15 wt％EP and 100 wt％WSS to prepare the mixtures of epoxy asphalt and steel slag.
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