绿色低碳再生粗骨料混凝土试验研究.docxVIP

绿色低碳再生粗骨料混凝土试验研究

摘要：为了降低碳排放、实现混凝土工程可持续发展，开展再生粗骨料在C40混凝土中应用可行性及其对混凝土性能的影响研究。通过再生粗骨料取代率试验依次研究C40混凝土的工作性能、力学性能、耐久性能。试验结果表明：（1）再生粗骨料取代率增大，混凝土30min坍落度降低明显，最大降低值18mm；30min扩展度在100%取代率时最大降低值31mm。30min倒置坍落度筒排空时间最长增加3.7s，取代率不超过60%时对混凝土影响较小。（2）取代率增大，混凝土7d、28d抗压强度值、劈裂抗拉强度值均逐渐减小。再生粗骨料取代率80%时，28d抗压强度值低于45MPa，并且拉压比降低明显。（3）取代率增大，混凝土试件6h电通量逐渐增加，混凝土抗氯离子渗透性能逐渐下降，40%取代率时电通量超过2800C，得出取代率不超过40%。

关键词：绿色低碳再生粗骨料混凝土取代率工作性能力学性能耐久性能

ExperimentalStudyonGreenLowCarbonRecycledCoarseAggregateConcrete

QIUYanWANGXiaoguang

1.TaianCityManagementComprehensiveServiceCenter，Tai’an，ShandongProvince，271000China;2.TaianWangjiayuanReservoirManagementServiceCenter，Tai’an，ShandongProvince，271000China

Abstract：Inordertoreducecarbonemissionsandrealizethesustainabledevelopmentofconcreteengineering，thefeasibilityoftheapplicationofrecycledcoarseaggregateinC40concreteanditsimpactonconcreteperformancewerestudied.Theworkingproperties，mechanicalpropertiesanddurabilityofC40concretewerestudiedbythesubstitutionratetestofrecycledcoarseaggregate.Thetestresultsshowthat：（1）Thesubstitutionrateofrecycledcoarseaggregateincreases，andtheslumpofconcretedecreasessignificantlynbsp;after30min，withamaximumreductionof18mm;（1）Themaximumreductionvalueof30minexpansionat100%substitutionrateis31mm.Theemptyingtimeoftheinvertedslumpcylinderincreasedby3.7sforamaximumof30min，andtheimpactontheconcretewassmallwhenthesubstitutionratedidnotexceed60%.（2）Withtheincreaseofsubstitutionrate，thecompressivestrengthvaluesandsplittingtensilestrengthvaluesofconcreteat7dand28ddecreased.Whenthesubstitutionrateofrecycledcoarseaggregateis80%，the28dcompressivestrengthvalueislowerthan45MPa，andthetensileandcompressiveratiodecreasessignificantly.（3）Thesubstitutionrateincreases.the6helectricfluxoftheconcretespecimengraduallyincreases，andthechlorideionpermeabilityoftheconcretegraduallydecreases，andtheelectricfluxexceeds2800Cwhenthesubstitutionrateis40%，andthesubstitutionrateisnotmorethan40%.

KeyWords：Greenlowcarbon;Recycledcoarseaggregate;Concrete;Replacementrate;Worki