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时间:2019-02-04
《自燃煤矸石轻集料混凝土碳化性能试验研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第38卷第3期非金属矿VO1.38No.32015年5月Non.MetallicMinesMay,2015自燃煤矸石轻集料混凝土碳化性能试验研究张向东李庆文李桂秀李洋(1辽宁工程技术大学土木与交通学院,辽宁阜新123000;2阜新市兴光市政工程有限责任公司,辽宁阜新123000)摘要为探究自燃煤矸石轻集料混凝土的碳化性能,通过快速碳化试验研究抗压强度、水灰比、水泥用量、温湿度及龄期等敏感性因素对碳化深度的影响。结果表明,抗压强度与碳化近似为负相关,在24~38~/IVa范围内,28d最大减小量为9.7mm;其他因素一定,水灰比越大,内部空隙越多,碳化深度越大;水泥用量提
2、高1倍,碳化深度减小14.7%,单纯增加水泥用量减小其碳化程度不可取,应综合考虑其他敏感性因素;相对湿度与碳化关系呈负相关,温度与碳化关系呈正相关;在3~14d范围时,碳化速率增长显著,超过14d时,碳化速率增长平缓。关键词自燃煤矸石;轻集料混凝土;快速碳化试验;碳化深度中图分类号:TU528.2;TD849~.5文献标识码:A文章编号:1000—8098(2015)03-oo40-o4ExperimentStudyonCarbonationResistanceofSpontaneousCombustionCoalGangueLightweightAggregatesC
3、oncreteZhangXiangdongLiQingwenLiGuixiu2LiYang(1SchoolofCivilEngineeringandTransportation,LiaoningTechnologyUnive~ity,Fuxin,Liaoning123000;2FuxinXingguangMunicipalEngineeringCo.,Ltd.,Fuxin,Liaoning123000)AbstractInordertoexplorethecarbonationresistanceofspontaneouscombustioncoalgangueligh
4、tweightaggregatesconcrete,researchtheimpactofthesensitivefactorsoncarbonationdepth,whicharecompressivestrength,water—cementratio,cementdosage,temperatureandrelativehumidity,curingperiodbytheacceleratedcarbonationexperiment.Theresultsshowedthattheconnectionbetweencompressivestrengthandcar
5、bonationwasnegativecorrelation,withinthescopeof24-38MPa,themaximumreductionwas9.7nnnon28thday.Ifotherconditionsareknown,thelargerthewater-cementratiois,themorecoalgangueconcretespacingis,thegreaterthecarbonationdepthis.Whenthecementdosagewasdoubled.thepercentageofcarbonationwasreducing14
6、.7%.Simplyincreasingthecementdosagetodecreasethecarbonizationdegreeisnotoptimumselection.Othersensitivityfactorsmustbetakenintoaccountcomprehensively.Therelationshipbetweenrelativehumidityandcarbonizationisnegativecorrelation,therelationshipbetweentemperatureandcarbonizationispositivecor
7、elation.Duringtherangeof3-14d,thecarbonationrateincreasedsignificantly,anditgrowngently,whenthecuringperiodwasexceeding14d.Keywordsspontaneouscombustioncoalgangue;lightweightaggregatesconcrete;acceleratedcarbonationexperiment;carbonationdepth煤矸石是煤矿开采产生的固体废弃物,堆积后形的碳化情况提供理论
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