自燃煤矸石骨料含水状态对混凝土性能的影响

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1、第38卷第2期非金属矿VO1．38No．22015年3月Noil．MetallicMinesMarch，2015自燃煤矸石骨料含水状态对混凝土性能的影响肖建华周梅赵华民(辽宁工程技术大学建筑工程学院，辽宁阜新123000)摘要自燃煤矸石骨料具有孔隙率大、吸水率高的特点，使其含水状态对混凝土性能的影响程度远大于天然骨料。利用气干、湿润和饱和面干状态的自燃煤矸石骨料配制备混凝土，通过混凝土稠度和强度试验，揭示自燃煤矸石骨料含水状态对混凝土性能的影响。结果表明，按普通混凝土设计方法确定单位用水量，气干状态自燃煤矸石骨料配制的混凝土，拌合物干稠不能满足大流动预

2、拌混凝土施工要求，加强振捣后硬化混凝土强度比普通混凝土高两个等级；按轻骨料混凝土设计方法确定单位用水量，即饱和面干自燃煤矸石骨料配制的混凝土，拌合物出现泌水、离析现象，强度降低一个等级；当自燃煤矸砂掺入吸水率60％的附加水、自燃煤矸石掺入吸水率80％的附加水，且提前lh润湿，配制的混凝土流动性和抗压强度与普通混凝土相当。关键词自燃煤矸石骨料；含水状态；和易性；强度中图分类号：TU528．041文献标识码：A文章编号：1000．8098(2015)02-0024-04EffectofMoistureStateforSpontaneousCombustio

3、nGangueAggregateonConcretePerformanceXiaoJianhnaZhouMeiZhaoHuamin(CollegeofArchitectureandEngineering，LiaoningTechnicalUniversity，Fuxin，LiaoningI23000)AbstractBecauseofspontaneouscombustiongangueaggregatehavesomecharacteristics，forexample，largeporosity,highbibulousrate，sotheefec

4、tdegreeofmoisturestateforspontaneouscombustiongangueaggregateonconcreteperformanceisgreaterthannaturalaggregate．Thispaper,usinggasdry,wetandsaturatedsurfacedrystateofspontaneouscombustioncoalgangueaggregatetoprepareconcrete，throughtheconcreteconsistencyandstrengthtesttorevealthe

5、effectofmoisturestateforspontaneouscombustiongangueaggregateonconcreteperformance．Theresultsshowthataccordingtotheordinaryconcretedesignmethodtodeterminetheunitwaterlse，thedrycondensedstateoftheconcretemixturewhichwaspreparedbyusinggasdrystateofspontaneouscombustioncoalgangueagg

6、regatecannotmeettheconstructionrequirements．Whentheconcretewasstrengthenedvibratory，thes~engthofhardenedconcretehadimprovedtwolevelshigherthanordinaryconcrete．Accordingtothelightweightaggregateconcretedesignmethodtodeterminetheunitwateruse，thatistoprepareconcretebyusingsaturated

7、surfacedrystateofspontaneouscombustioncoalgangueaggregate，theconcretemixtureappearedbleeding，segregationphenomenon，andthestrengthhaddecreasedaleve1．Inadditionthat，whenthespontaneouscombustioncoalganguesandmixedwithanadditionalwaterwhichwas60％ofwaterabsorption，thespontaneouscombu

8、stioncoalganguemixedwithanadditionalwaterwhichw