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1、寒區(qū)復合低摻量水泥加固紅土抗凍性試驗研究／薛慧君等·121·寒區(qū)復合低摻量水泥加固紅土抗凍性試驗研究薛慧君，申向東，鄒春霞，周海龍，田曉敏(內(nèi)蒙古農(nóng)業(yè)大學水利與土木建筑工程學院，呼和浩特010O18)摘要在寒區(qū)，合理利用季節(jié)性凍土和紅土等天然特殊區(qū)域土是工程應(yīng)用技術(shù)面臨的一大問題。以內(nèi)蒙古武川地區(qū)季節(jié)性凍紅土為例，對其進行單摻PAM和復摻PAM及粉煤灰復合低摻量水泥加固試驗研究，以改善其工程特性。通過測定復合低摻量水泥加固紅土凍融循環(huán)試驗前后的質(zhì)量損失和強度損失來進行抗凍性試驗研究，試驗結(jié)果表明復
2、摻0．6PAM及8粉煤灰復合低摻量水泥加固紅土，能夠有效地減少凍融前后的質(zhì)量損失和強度損失。并對最佳摻量下的復合低摻量水泥加固紅土的應(yīng)力一應(yīng)變?nèi)€進行回歸分析，得到上升段曲線和下降段曲線方程，上升段曲線滿足三次多項式方程，下降曲線段滿足對數(shù)方程。本工作對季節(jié)性凍紅土的人工加固具有一定的參考價值，可為工程的實際應(yīng)用提供參考依據(jù)。關(guān)鍵詞季節(jié)性凍紅土凍融循環(huán)質(zhì)量損失強度損失應(yīng)力一應(yīng)變中圖分類號：TU445；TU446文獻標識碼：ADOI：10．11896／j．issn．1005—023X．2014．1
3、8．030ExperimentalStudyonFreezingResistanceofRedClayReinforcedbyCementwithCompositeLowDosageinColdRegionXUEHuijun，SHENXiangdong，ZOUChunxia，ZHOUHailong，TIANXiaomin(CollegeofWaterConservancyandCivilEngineering，InnerMongoliaAgriculturalUniversity，Hohhot01
4、0018)AbstractIncoldregions，itisagreatchallengefortheengineeringandapplicationtechnologytOmakefulluseoftheseasona1frozensoilandredclayinnaturalspecialareas．UsingtheseasonalfrozenredsoilinWuchuandistrictofInnerMongolia，thestrengtheningexperimentalstudyo
5、ffrozenredsoilmixedwithsingle-dopedPAM，re-dopedPAMandcompositelowdosagecementwasconductedSOastoimproveitsengineeringcharacteristics．Anexperimen—talstudyoffrostresistancewasappliedtOmeasurethequalitylossandstrengthlossofcompositelowdosagecementreinforc
6、edredfrozensoilbeforeandafterthefreeze-thawcycletest．Theresultsindicatedthatthecomposite1OWdo-sagecementreinforcedredfrozensoilmixedwithre-dopedPAMof0．6andcoalashof8couldeffectivelylowerthequalitylossandstrengthlossbeforeandafterthefreeze-thawcycletes
7、t．Besides，aregressionanalysisonthewholestress-straincurvesofcompositelOWdosagecementreinforcedredfrozensoi1underconditionsoftheoptimalmixingamountswasadopted，thus，eurvilinearequationsoftherisinganddescendingcurveswereobtained．Herein，therisingcurverela
8、tedequationisacubicpolynomialoneandthedescendingequationisalogarithmicone．Thestudyhasacertainreferencevalueforartificialreinforcementofseasona1frozenredclay。andcanprovidereferencebasisforpracticalengineeringapplications．Keywordsseasonalfrozenr
