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改性沸石对可溶性碱的吸附性能及其对碱硅酸反应的抑制效果
作者:牛全林 冯乃谦 张新国 
单位:清华大学土木工程系 山东理工大学材料学院 潍坊市环保局 北京 100084山东理工大学材料学院山东 淄博 255049  山东 淄博 255049  山东 潍坊 261061 
关键词:改性沸石  混凝土  可溶性碱  碱硅酸反应 
分类号:TU528
出版年,卷(期):页码:2004,32(4):515-519
DOI:
摘要:
通过对天然沸石进行改性处理,可以大大提高其吸附K+,Na+的能力,降低混凝土中可溶性碱的含量,从而抑制碱骨料反应的发生。ASTMC441实验表明:利用改性沸石等量取代水泥5%可将碱硅酸反应引起的膨胀降低到0.1%以下,而要达到同样效果,粉煤灰和矿渣的掺量(质量分数)分别为25%和40%左右。水泥物理性能检验表明:掺加5%的改性沸石,水泥的需水量、强度、凝结时间和安定性等指标均可以满足国标的要求,因此,可在不改变混凝土其它性能的前提下,起到抑制碱骨料反应的作用。
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The modified zeolite with higher alkaline cations exchange capacity was produced through modification of natural zeolite, with which the concentration of soluble alkaline in concrete was decreased considerably, and the alkalisilica reaction (ASR) controlled consequently. It is shown from ASTM C441 that the ASR induced expansion was less than 0.1% by substitution of cement with 5% of the modified zeolite, while the percentage of the fly ash and blast furnace slag with the same result is about 25% and 40% respectively. Physical properties of cement such as normal consistency, setting time, bending and compressive strength also meet the requirements of national standard, indicating that the ASR expansion can be inhibited by 5% of modified zeolite without degrading other properties of concrete.
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参考文献:
[1] JACOBSA.CarboniogenicActivityofZeolite[M].Amsterdam:ElsevierScientificPublishingCompany,1977.3—8. [2] FENGNQ,JIAHW,CHENEY.StudyonthesuppressioneffectofmaturalzeoliteonexpansionofconcreteduetoAAR[J].MagConcrRes,1998,50(1):17—24. [3] 封孝信.混凝土骨料碱活性的检测及抑制碱骨料反应膨胀的研究.北京:清华大学,2002.84—85.FENGXiaoxin.Testingtheactivityofaggregatesandstudiesonthemeasuresforsuppressingtheexpansionduetoalkali-aggregatereaction(inChinese,dissertation).Beijing:TsinghuaUniversity,2002.84—85 [4] TADASIFujiwara,EIJISaton,JIANGDong.Adaptablityofzeoliteasanadmixtureforpreventingalkali aggregatereaction[J].JCAProcCemConc,1995(49):674—679. [5] 冯乃谦,石云兴.超细粉对水泥浆体的流化与增强效应[J].混凝土与水泥制品,1997(2):4—7.FENGNaiqian,SHIYunxing.ConcrCemProduct[J],1997(2):4—7. [6] ASTMC1260StandardTestMethodforPotentialAlkaliReactivityofAggregates(mortarbartest)[S]. [7] ASTMC441StandardTestMethodforEffectivenessofMineralAdmixturesorGroundBlast-FurnaceSlaginPreventingExcessiveExpansionofConcreteDuetotheAlkali-SilicaReaction[S].
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