轻细骨料内养护混凝土抗冻融和抗盐冻性能

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1、学兔兔www.xuetutu.com第17卷第5期建筑材料学报Vo1．17。No．52O14年10月J0URNAL0FBUILDINGMATE：RIAIS0ct．。2O14文章编号：1007—9629(2014)05—0901—07轻细骨料内养护混凝土抗冻融和抗盐冻性能魏亚，向亚平(1．清华大学土木工程系，北京100084；2．清华大学土木工程安全与耐久教育部重点实验室，北京1OOO84)摘要：采用粉煤灰陶砂和页岩陶砂为轻细骨料，研究了水灰比m／m为0．4和0．3，引气与非引气情况下轻细骨料内养护混凝土与普通混凝土28d抗冻融和抗

2、盐冻性能．结果表明：当水灰比为0．4时，轻细骨料内养护混凝土抗冻融和抗盐冻性能明显低于普通混凝土，原因是轻细骨料内养护混凝土28d饱水度明显大于普通混凝土，但适量引气可明显提高其抗冻融和抗盐冻性能；当水灰比为0．3时，轻细骨料内养护混凝土抗冻融和抗盐冻性能较好，无需引气；同等条件下，轻细骨料筒压强度越高，对应混凝土抗冻融和抗盐冻性能越好．关键词：混凝土；轻细骨料；内养护；冻融；盐冻中图分类号：TU528．2文献标志码：Adoi：10．3969／j．issn．1007—9629．2014．05．025Freeze-ThawResis

3、tanceandSalt—ScalingResistanceofInternalCuringConcretewithLightweightFineAggregateWEYa。XIANGYaping，。(1．DepartmentofCivilEngineering，TsinghuaUniversity，Beijing100084，China；2．KeyLaboratoryofCivilEngineeringSafetyandDurabilityofChinaEducationMinistry，TsinghuaUniversity，B

4、eijing100084，China)Abstract：Sinteredflyashandexpandedshalewereemployedaslightweightfineaggregatesintointernalcuringconcrete．28一day～agefreeze—thawresistanceandsalt—scalingresistanceofnormalconcreteandinter—nalcuringconcretewereinvestigatedatwater—cementratios(bymass)of

5、0．3and0．4withandwithoutair—entrainment．Experimentalresultsshowthatatwater—cementratioof0．4，internalcuringconcretewithlightweightfineaggregateexhibitsinferiorfreeze-thawresistanceandsalt—scalingresistancethanthatofnormalconcrete．Thereasonisthattheinitialdegreeofsaturat

6、ionintheinteriorofinternalcuringcon—cretewithlightweightfineaggregateisclearlygreaterthanthatofnormalconcrete．Additionofsuitableamountofair—entrainmentcanimprovethefreeze——thawresistanceandsaltscalingresistanceofinternalCU——ringconcretewithlightweightfineaggregate．Atw

7、ater—cementratioof0．3，internalcuringconcretewithlightweightfineaggregatedemonstratesstrongfreeze—-thawresistanceandsalt——scalingresistancewithoutair—entrainment．Inthesamecondition，thehigherthetubestrengthoflightweightfineaggregate，thebet—terthecorrespondingfreeze—thaw

8、resistanceandsalt—scalingresistanceofinternalcuringconcrete．Keywords：concrete；lightweightfineaggregate；internalcuring；freeze