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时间:2020-03-27
《三灰碎石抗裂性能研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第28卷第l期公路交通科技V01.28No.12011年1月JournalofHighwayandTransportationResearchandDevelopmentJan.201l文章编号:1002—026812011)01-0031—06三灰碎石抗裂性能研究陈渊召1,张舒畅2(1.长安大学公路学院,陕西西安710064;2.邯郸市交通局公路工程管理处,河北邯郸056002)摘要:通过基本力学性能试验,对比研究了三灰碎石等半刚性基层材料的强度特性。基于失水率、干缩应变、干缩系数等指标,研究分析了三灰碎石和
2、其他半刚性基层材料的干缩性能。回归分析了累计干缩量与时间和累计失水率的关系。并通过温缩试验分别研究了温度收缩系数与温度区间的关系、平均温缩系数与最大温缩系数的关系。研究表明:在三灰碎石外掺水泥小于2%的情况下,三灰碎石的干缩性能、温缩性能均优于水泥粉煤灰稳定碎石和水泥稳定碎石,但是均比二灰碎石稍差。建议三灰碎石外掺水泥的含量不超过2%,通过早期养护提高三灰碎石的干温缩性能;推荐以O一一10℃之间的温缩系数评价三灰碎石的温缩性能。关键词:道路工程;三灰碎石;试验研究;抗裂性能;干缩性能;温缩性能中图分类号:U41
3、6.214文献标识码:AResearchonCrackResistanceofLime··flyash·-cementStabilizedMacadamCHENYuanzha01,ZHANGShuchan92(1.SchoolofHighway,Chang'anUniversity,Xi’anShaanxi710064,China;2.RoadEnsineefingManagementOffice,HaManTransportationBureau,HandanHebei056002,China)Abstrac
4、t:Throughexperimentalresearchofbasicmechanicalproperties,comparativestudyofthestrengthpropertiesofsemi—rigidbasematerialsincludinglime·flyash-cementstabilizedmacadamWascarriedout.Throughstudyoftheindicesofwaterlossrate,dryshrinkagestrainandshrinkagecoefficie
5、nt,dryshrinkageperformanceoflime—flyash—cementstabilizedmacadamandothersemi·rigidbasematerialsWasanalyzed.Byregressionanalysis,therelationofaccumulativedryshrinkageamountwithtimeandaccumulativewaterlossratewasgot.Throughtemperatureshrinkagetest,therelationbe
6、tweentemperatureshrinkagecoefficientandtemperaturerangeWasstudied,andtherelationbetweenaveragetemperatureshrinkagecoefficientandmaximumtemperatureshrinkagecoefficientWasresearched.Theresultsshowthat(1)whencementadmixturedosageoflime—flyash—cementstabilizedma
7、cadamislessthan2%.dryshrinkageperformanceandtemperatureshrinkageperformanceoflime—flyash—cementstabilizedmacadamaresuperiortothoseofcement-flyashstabilizedmacadamandcementstabilizedmacadam,butalittleworsethanthoseoflime—flyashstabilizedmacadam.Itissuggestedt
8、hatthecementadmixturedosageoflime-flyash—cementstabilizedmacadamislessthan2%.toimprovetheshrinkageperformanceoflime—flyash—cementstabilizedmacadamthroughearlycuring,andtoevaluatethetemperaturesh
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