针对重载交通下沥青混凝土路用性能与经济性需求,开展路面沥青混凝土配合比优化设计研究。通过对比连续级配与间断级配特性,确定间断级配更适用于重载高速路面;构建以油石比、矿料间隙率(Voids in Mineral Aggregate,VMA)、有效沥青饱和...针对重载交通下沥青混凝土路用性能与经济性需求,开展路面沥青混凝土配合比优化设计研究。通过对比连续级配与间断级配特性,确定间断级配更适用于重载高速路面;构建以油石比、矿料间隙率(Voids in Mineral Aggregate,VMA)、有效沥青饱和度(Voids Filled by Asphalt,VFA)为核心参数的多目标优化模型,结合正交试验、响应面法(Response Surface Methodology,RSM)和遗传算法(Genetic Algorithm,GA),筛选配比方案。试验表明,优化配比使动稳定度提升17.29%、弯拉应变提高28.3%、单位成本有效降低,并且高温抗车辙、低温抗裂和抗水损害性能显著改善。研究为沥青混凝土配合比设计提供了理论与实践参考。展开更多
Current mix design practices typically assume total blending and use the white curve of reclaimed asphalt pavement(RAP)to determine the gradation and optimum asphalt content(OAC)of recycled hot mix asphalt(HMA),often ...Current mix design practices typically assume total blending and use the white curve of reclaimed asphalt pavement(RAP)to determine the gradation and optimum asphalt content(OAC)of recycled hot mix asphalt(HMA),often overlooking the effects of RAP agglomeration and partial blending.This oversight can result in unsatisfactory performance,particularly when higher RAP content is used.Therefore,this paper reviews and discusses strategies for adjusting the mix design of recycled HMA to enhance its in-service performance.The discussion begins with RAP particle agglomeration,a significant phenomenon that significantly impacts the aggregate gradation of recycled HMA.Subsequently,detection methods to clarify the blending between virgin and RAP binders are described.Partial blending between RAP and virgin binders is common,and various indexes have been proposed to quantify the blending degree.Finally,the adjusted mix design method of recycled HMA is presented,emphasizing gradation optimization and corrected OAC.Gradation optimization should account for RAP agglomeration,while the corrected OAC should consider particle blending.Recycled HMA using the adjusted mix design exhibits improved crack resistance and fatigue life without substantially impairing rutting performance.This review aims to help both academics and highway agencies maximize the utilization of RAP materials within sustainable pavement frameworks.展开更多
文摘针对重载交通下沥青混凝土路用性能与经济性需求,开展路面沥青混凝土配合比优化设计研究。通过对比连续级配与间断级配特性,确定间断级配更适用于重载高速路面;构建以油石比、矿料间隙率(Voids in Mineral Aggregate,VMA)、有效沥青饱和度(Voids Filled by Asphalt,VFA)为核心参数的多目标优化模型,结合正交试验、响应面法(Response Surface Methodology,RSM)和遗传算法(Genetic Algorithm,GA),筛选配比方案。试验表明,优化配比使动稳定度提升17.29%、弯拉应变提高28.3%、单位成本有效降低,并且高温抗车辙、低温抗裂和抗水损害性能显著改善。研究为沥青混凝土配合比设计提供了理论与实践参考。
基金sponsored by the National Natural Science Foundation of China(52178420,52408476)Special subsidy from Heilongjiang Provincial People's Government(HITTY-20190028)+1 种基金Postdoctoral Fellowship Program of CPSF(GZC20242207)the Fundamental Research Funds for the Central Universities(HIT.DZJJ.2023086).
文摘Current mix design practices typically assume total blending and use the white curve of reclaimed asphalt pavement(RAP)to determine the gradation and optimum asphalt content(OAC)of recycled hot mix asphalt(HMA),often overlooking the effects of RAP agglomeration and partial blending.This oversight can result in unsatisfactory performance,particularly when higher RAP content is used.Therefore,this paper reviews and discusses strategies for adjusting the mix design of recycled HMA to enhance its in-service performance.The discussion begins with RAP particle agglomeration,a significant phenomenon that significantly impacts the aggregate gradation of recycled HMA.Subsequently,detection methods to clarify the blending between virgin and RAP binders are described.Partial blending between RAP and virgin binders is common,and various indexes have been proposed to quantify the blending degree.Finally,the adjusted mix design method of recycled HMA is presented,emphasizing gradation optimization and corrected OAC.Gradation optimization should account for RAP agglomeration,while the corrected OAC should consider particle blending.Recycled HMA using the adjusted mix design exhibits improved crack resistance and fatigue life without substantially impairing rutting performance.This review aims to help both academics and highway agencies maximize the utilization of RAP materials within sustainable pavement frameworks.
