环氧沥青钢渣混合料的性能及组成优化

Performance of mixtures of epoxy asphalt and steel slag and its composition optimization

制备了不同环氧树脂(EP)及未陈化钢渣粗集料(WSS)掺量的环氧沥青钢渣混合料,利用路用性能试验探究了材料组成变化对混合料性能的影响。同时,结合微观试验进行机理分析,并对沥青混合料组成进行优化。结果表明,受表面高粗糙度及碱性特性影响,WSS相较于玄武岩吸附较多沥青并形成更厚的沥青膜。EP掺量不变时,WSS掺量增大有助于改善混合料的水稳定性和低温抗裂性能。EP具有热固性和粘结性优异等特点,即使在较低EP掺量下也可以较好地抑制混合料的体积膨胀,且随着EP掺量的增大,混合料的综合路用性能得到显著提升。EP掺加质量分数达到15%以上时,EP固化后聚集成较大的不规则状颗粒并分散在环氧沥青中,改善了混合料的路用性能,进而能够实现WSS对玄武岩粗集料的100%替代。综合性能与成本因素,推荐选用质量分数15%的EP及100%的WSS制备环氧沥青钢渣混合料。

The mixtures of epoxy asphalt and steel slag with different dosages of epoxy resin(EP)and unaged steel slag coarse aggregate(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 adhesion 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 than15%,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.