摘要
为了减少天然集料的消耗,实现回收沥青混合料(RAP)和钢渣在道路工程中的协同、高效利用。本研究通过协同再生设计制备了6种不同掺配比例的混合料,并通过对比路用性能优选掺配方案。首先,分析了RAP级配、回收沥青性能及集料力学性能,并根据回收材料性质确定适用层位,进一步依据RAP级配调整矿料级配。然后,采用马歇尔设计方法确定了RAP掺量分别为20%、40%,钢渣掺量分别为20%、40%、60%六种混合料的最佳油石比。最后,测试了六种混合料的高、低和水稳定性能。结果发现:RAP中集料力学性能下降,适用于沥青路面的下面层或上基层。六种掺配方案的混合料高温稳定性和低温抗裂性均满足要求,但水稳性决定了掺配率上限。RAP掺量为40%时,钢渣掺量超过40%会导致冻融劈裂残留强度下降,性能较优的掺配方案为RAP和钢渣各占40%。
To reduce the consumption of natural aggregates and achieve the synergistic and efficient utilization of recycled asphalt pavement(RAP)and steel slag in road engineering,this study developed six different mix designs with varying proportions through a synergistic regeneration design.The optimal mix design was selected by comparing the road performance.First,the gradation of RAP,the performance of reclaimed asphalt,and the mechanical properties of aggregates were analyzed,and the suitable layer positions for the recycled materials were determined based on their properties.Further,the mineral gradation was adjusted according to the RAP gradation.Then,the Marshall design method was employed to determine the optimal binder-to-aggregate ratios for six different mixes with RAP contents of 20%and 40%and steel slag contents of 20%,40%,and 60%.Finally,the high-temperature stability,low-temperature cracking resistance,and water stability of these six mixes were tested.The results showed that the mechanical properties of aggregates in RAP decreased,making it suitable for the lower or base layers of asphalt pavements.The high-temperature stability and low-temperature cracking resistance of all six mixes met the requirements,but water stability determined the upper limit of the mixing ratio.When the RAP content was 40%,increasing the steel slag content beyond 40%led to a decrease in freeze-thaw splitting residual strength.The optimal mix design was 40%RAP and 40%steel slag.
作者
方珑
张勇
邵向阳
庞振宇
刘奇
洪千哲
于斌
FANG Long;ZHANG Yong;SHAO Xiangyang;PANG Zhenyu;LIU Qi;HONG Qianzhe;YU Bin(Zhangjiagang Municipal Transportation Bureau,Suzhou Jiangsu 215617,China;Nanjing Jiangbei New District Hub Economic Development Management Office,Nanjing Jiangsu 210000,China;China Design Group,Nanjing Jiangsu 210014,China;Southeast University,School of Transportation,Nanjing Jiangsu 210096,China)
出处
《交通节能与环保》
2025年第6期107-113,共7页
Transport Energy Conservation & Environmental Protection
基金
国家自然科学基金(51878163)。
关键词
沥青混合料
回收沥青路面
钢渣
热再生
协同设计
路用性能
asphalt mixture
recycling of asphalt pavement
steel slag
thermal regeneration
collaborative design
road performance
