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时间:2019-02-04
《成型方式对再生混凝土性能影响的试验研究》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、学兔兔www.xuetutu.com2014年第7期(总第297期)混凝土实用技术Number7in2014(TotalNo.297)ConcretePRACTICALTECHNOLOGYdoi:10.3969~.issn.1002—3550.2014.07.038成型方式对再生混凝土性能影响的试验研究田正林。吴相豪(上海海事大学海洋环境与工程学院,上海201306)摘要:通过试验研究了真空脱水、净浆裹石和粗骨料预湿三种成型方式对再生粗骨料混凝土抗压强度和抗氯离子渗透性能的影响。结果表明:(1)随着真空
2、度的增加,再生粗骨料混凝土抗压强度是先增大后减小,最佳真空度为0.06MPa;抗氯离子渗透陛能是先增强后减弱,最佳真空度为0.04MPa。(2)净浆裹石对再生粗骨料混凝土抗压强度和抗氯离子渗透眭能有一定的影响。用水泥和75%的水拌制的净浆裹石能明显提高再生粗骨料混凝土的抗压强度;用水泥和50%的水拌制的净浆裹石能明显改善再生粗骨料混凝土的抗氯离子渗透性能。(3)再生粗骨料混凝土抗压强度随着预湿再生粗骨料水量的增加而增大;抗氯离子渗透能力随着预湿再生粗骨料水量的增加是先增强后减弱,最佳预湿用水量为配合比水
3、量的3%。关键词:再生混凝土;真空脱水;净浆裹石;粗骨料预湿;抗压强度;氯离子渗透中图分类号:TU528.063文献标志码:A文章编号:1002—3550(2014)07—0145—04ExperimentalresearchofformingtechnologyeffectsonpropertiesofrecycledconcreteTIANZhenglin,WUXianghao(CollegeofOceanEnvironmentandEngineering,ShanghaiMaritimeUnive
4、rsity,Shanghai201306,China)Abstract:Theeffectsofthreeformingtechnologies,vacuumdewatering,interfacingstoneenvelopedwithcementandcoarseaggregatepre—wet,oncompressivestrengthandchlorideionpenetrationofrecycledcoarseaggregateconcretearcresearchedbyexperimen
5、ts.Resultsshowthat:1)Thecompressivestrengthofrecycledcoarseaggregateconcretefirstincreasesandthendecreaseswiththeincreaseofthevac—uumdegree,thebestvacuumdegreeis0.06MPa,thechlorideionpenetrationofrecycledcoarseaggregateconcreteisenhancedfirstlyandthenwea
6、kenedwiththebestvacuumdegreeof0.04MPa.2、Interfacingstoneenvelopedwithcementhascertaineffectsoncompressivestrengthandresistancetochlorideionpermeabilityofrecycledcoarseaggregateconcrete.Interfacingstoneenvelopedwithcementresultshowsthatwith75%waterCallsig
7、nificantlyincreasethecompressivestrengthofrecycledcoarseaggregateconcrete;however,interfacingstoneenvelopedwithcementwith50%watercanimprovetherecycledcoarseaggregateconcreteresistancetochlorideionpenetrationsig—nificantly.3)Withtheincreaseoftheamountofco
8、arseaggregatepre—wetwater,thecompressivestrengthofrecycledcoarseaggregatecon—creteincreasesandtheresistancetochlorideionpenetrationcapacityincreasesfirstlyandthendecreases,thebestamountofcoarseaggre—gatepre—wetwateris3%ofm
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