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王稷良^1，2，韩   彬^1，2

 

 

（1.河北工程大学 土木工程学院，邯郸 056038；2.交通运输部公路科学研究院，北京 100088）

摘要：采用分档替代法，在固定级配和水泥掺量下以再生集料等质量替代同档天然集料，研究了不同粒径再生集料对混合料路用性能的影响。结果表明:各粒径再生集料分别替代天然集料后的再生混合料最佳含水率均大于天然混合料，最大干密度均小于天然混合料；再生混合料7、28 d无侧限抗压强度及劈裂抗拉强度与天然混合料相近，但90 d龄期增长幅度明显小于天然混合料；与天然混合料相比，再生混合料90 d抗压回弹模量降低10.9%~38.6%；各粒径替换后的再生混合料干缩系数及温缩系数随着替换粒径的减小逐渐变大，其中≤2.36 mm粒径替换后，再生混合料28 d累计干缩应变约为天然混合料的1.68倍，总温缩系数为全天然混合料的1.53倍。研究成果可为再生集料在道路基层中的精细化利用提供参考。

关键词：道路工程；分档掺配；无侧限抗压强度；劈裂抗拉强度；干燥收缩；温度收缩

中图分类号：U416.26

文献标志码：A

文章编号：1005-8249（2025）06-0103-07

DOI：10.19860/j.cnki.issn1005-8249.2025-06-018

 

 

 

WANG Jiliang^1，2，HAN Bin^1，2

 

 

(1.School of Civil Engineering,Hebei University of Engineering,Handan 056038,China；

 

2.Research Institute of Highway Ministry of Transport,Beijing 100088,China)

 

Abstract：This study employed the sub-grade blending method to investigate the differential influences of various particle sizes of recycled aggregates on the performance of cement-stabilized mixtures.Under fixed gradation and cement content,recycled aggregates were used to replace natural aggregates of corresponding size fractions at equal mass.The results indicate that the optimum moisture content of the recycled mixtures was higher than that of the natural mixture,while the maximum dry density was lower.The 7 and 28-day unconfined compressive strength and splitting tensile strength of the recycled mixtures were comparable to those of the natural mixture.However,the strength increment at the long-term age of 90-day was significantly lower.The 90-day compressive resilient modulus of the recycled mixtures decreased by 10.9% to 38.6% compared to that of the natural mixture.Both the drying shrinkage coefficient and the temperature shrinkage coefficient of the recycled mixtures gradually increased with a decrease in the particle size of the replaced aggregates.In particular,when the ≤2.36 mm fraction was replaced,the 28-day cumulative drying shrinkage strain of the recycled mixture was about 1.68 times that of the natural mixture,and the total temperature shrinkage coefficient reached 1.53 times that of the fully natural mixture.The research findings can provide reference for the precision application of recycled aggregates in road base courses.

 

Key words：road engineering;sub-grade blending;unconfined compressive strength;splitting strength;drying shrinkage;temperature shrinkage

基金项目：内蒙古自治区交通运输科技项目（NJ-2020-28,NJ-2022-13）。

作者简介：王稷良（1978—），男，博士，研究员，研究方向:高性能水泥基材料。

通信作者：韩  彬（1995—），男，硕士研究生，研究方向:道路工程材料。

收稿日期：2025-01-21