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1、第28卷第l期公路交通科技V01.28No.12011年1月JournalofHighwayandTransportationResearchandDevelopmentJan.201l文章編號:1002—026812011)01-0031—06三灰碎石抗裂性能研究陳淵召1,張舒暢2(1.長安大學(xué)公路學(xué)院,陜西西安710064;2.邯鄲市交通局公路工程管理處,河北邯鄲056002)摘要:通過基本力學(xué)性能試驗(yàn),對比研究了三灰碎石等半剛性基層材料的強(qiáng)度特性?;谑?、干縮應(yīng)變、干縮系數(shù)等指標(biāo),研究分析了三灰碎石和
2、其他半剛性基層材料的干縮性能?;貧w分析了累計(jì)干縮量與時(shí)間和累計(jì)失水率的關(guān)系。并通過溫縮試驗(yàn)分別研究了溫度收縮系數(shù)與溫度區(qū)間的關(guān)系、平均溫縮系數(shù)與最大溫縮系數(shù)的關(guān)系。研究表明:在三灰碎石外摻水泥小于2%的情況下,三灰碎石的干縮性能、溫縮性能均優(yōu)于水泥粉煤灰穩(wěn)定碎石和水泥穩(wěn)定碎石,但是均比二灰碎石稍差。建議三灰碎石外摻水泥的含量不超過2%,通過早期養(yǎng)護(hù)提高三灰碎石的干溫縮性能;推薦以O(shè)一一10℃之間的溫縮系數(shù)評價(jià)三灰碎石的溫縮性能。關(guān)鍵詞:道路工程;三灰碎石;試驗(yàn)研究;抗裂性能;干縮性能;溫縮性能中圖分類號:U41
3、6.214文獻(xiàn)標(biāo)識碼: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