寒区复合低掺量水泥加固红土抗冻性试验研究

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1、寒区复合低掺量水泥加固红土抗冻性试验研究／薛慧君等·121·寒区复合低掺量水泥加固红土抗冻性试验研究薛慧君，申向东，邹春霞，周海龙，田晓敏(内蒙古农业大学水利与土木建筑工程学院，呼和浩特010O18)摘要在寒区，合理利用季节性冻土和红土等天然特殊区域土是工程应用技术面临的一大问题。以内蒙古武川地区季节性冻红土为例，对其进行单掺PAM和复掺PAM及粉煤灰复合低掺量水泥加固试验研究，以改善其工程特性。通过测定复合低掺量水泥加固红土冻融循环试验前后的质量损失和强度损失来进行抗冻性试验研究，试验结果表明复

2、掺0．6PAM及8粉煤灰复合低掺量水泥加固红土，能够有效地减少冻融前后的质量损失和强度损失。并对最佳掺量下的复合低掺量水泥加固红土的应力一应变全曲线进行回归分析，得到上升段曲线和下降段曲线方程，上升段曲线满足三次多项式方程，下降曲线段满足对数方程。本工作对季节性冻红土的人工加固具有一定的参考价值，可为工程的实际应用提供参考依据。关键词季节性冻红土冻融循环质量损失强度损失应力一应变中图分类号：TU445；TU446文献标识码：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