恶劣环境下机制砂混凝土的强度和耐久性能

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1、学兔兔www.xuetutu.com第15卷第3期建筑材料学报Vo1．15。NO．32012年6月JOURNALOFBUILDINGMATERIALSJun．，2012文章编号：1007—9629(2012)03—0391—04恶劣环境下机制砂混凝土的强度和耐久性能陈正发，刘桂凤，秦彦龙，徐建民(1．山东理工大学建筑工程学院，山东淄博255049；2．山东凝易固砂浆科技有限公司，山东淄博255051)摘要：在对原材料进行性能测试和混凝土配合比试验的基础上，对C30机制砂混凝土开展了高温和冻融循环试验．对比研究了冻融循环、冻融循环后酸侵蚀和碱侵蚀3种情况下机制砂混凝土强

2、度、相对动弹模量的变化规律；对比研究了高温、高温后酸侵蚀和碱侵蚀3种情况下机制砂混凝土强度、相对动弹模量的变化规律．结果表明：在试验温度和冻融次数范围内，机制砂混凝土在高温和冻融循环后抗压强度、相对动弹模量显著降低，并随温度和冻融循环次数的增加其降低幅度有增大趋势；机制砂混凝土在高温和冻融循环后，耐酸、碱侵蚀性能明显降低，温度越高、经受的冻融循环次数越多，其耐酸、碱侵蚀能力越低，且以耐酸侵蚀能力为最低．关键词：机制砂混凝土；恶劣环境；高温；冻融循环；强度；耐久性能中图分类号：TU528．01文献标志码：Adoi：10．3969／j．issn．1007—9629．2O1

3、2．03．019StrengthandDurabilityofConcretewithManufactured-SandinSevereEnvironmentCHENZheng—fa，LIUGui—feng，QINYan—long，X【，Jian—rain。(1．SchoolofArchitectureEngineering，ShandongUniversityofTechnology，Zibo255049，China；2．ShandongNingyiguMortarTechnologyInc．，Zibo255051，China)Abstract：Nowadays，f

4、ewpeopleinvestigatedthestrengthanddurabilityofconcretewithmanufactured—sandinsevereenvironment．ExperimentstudiesonC30concretewithmanufactured—sandwerecarriedoutunderconditionofhightemperatureandfreeze·—thawcyclesbasedonthetestingofrawmaterialsperform--ancesandconcretemixproportion．Compa

5、rativestudiesonthechanginglawsofthestrengthandtherela—tivedynamicelasticmodulusofconcretewithmanufactured—sandweremadeinsomecases，includinghightemperatureandfreeze-thawcycles，acidcorrosionafterhightemperatureandfreeze-thawcyclesandalkalicorrosionfollowinghightemperaturesandfreeze—thawcy

6、cles．Theresultsoftestsindicatethatthestrengthandtherelativedynamicelasticmodulusofconcretewithmanufactured—sanddecreasesmarkedlywiththeincreaseoftemperatureandthenumberoffreeze—thawcycles．Theacid—andalkali—resistanceofconcretewithmanufactured—sandisalsoremarkablyweakenedduetotheactionof

7、heatingandfreeze—thawcycles．Theacid-andalkali—resistance，especiallytheacid-resistanceoftheconcretelowerswiththein—creaseoftemperatureandthenumberoffreeze—thawcycles．Keywords：concretewithmanufactured—sand；severeenvironment；hightemperature；freeze-thawcycle；strength；durability随着经济