分档掺配水泥稳定再生集料性能研究

打开文本图片集

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

Abstract：Thisstudyemployedthesub-grade blending method toinvestigate thediferential influencesofvarious particle sizes ofrecycledaggegatesonthe performanceofcement-stabilized mixtures.Under fixed gradationandcementcontent，recycled aggregates wereused toreplacenatural agregates ofcorrsponding sizefractions atequal massTheresults indicate thatthe optimummoisturecontent of therecycled mixtures was higher thanthatofthenatural mixture，while the maximumdrydensity waslower.The7and28-dayunconfinedcompresivestrengthandspliting tensile strengthof therecycledmixtures were comparable tothoseof thenatural mixture.However，thestrength incrementatthelong-termageof9O-daywassignificantly lower. The 9O -day compressive resilient modulus of the recycled mixtures decreased by 10.9% to 38.6% compared to that of thenaturalmixture.Boththedryingshrinkagecoeffcientandthetemperatureshrinkagecoeffcientof therecycledmixtures graduallyincreased withadecreaseintheparticlesizeofthereplacedagregates.Inparticular，whenthe≤2.36mmfraction was replaced，the 28- day cumulative drying shrinkage strain of the recycled mixture was about 1.68 times that of the natural mixture，andthetotaltemperatureshrinkagecoeffcientreached1.53timesthatof thefullynaturalmixture.Theresearch findings can provide reference for the precision application of recycled aggregates in road base courses.

Key words：road engineering；sub-grade blending；unconfined compresive strength；spliting strength；drying shrikage; temperature shrinkage

0 引言

随着城市更新和基础设施的持续升级，旧建筑物及构筑物的拆除与改造活动日益频繁，随之产生了大量的建筑垃圾[1]。（剩余7966字）