陶瓷抛光渣对水泥基材料碱集料反应的影响
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摘要
以0%、20%、30%、40%陶瓷抛光渣等量取代水泥制备砂浆试样,矿渣作对比试验,通过膨胀率、强度测定、扫描电子显微镜观察和能谱分析,研究陶瓷抛光渣对水泥基材料碱集料反应的影响规律,揭示矿物掺合料抑制碱集料反应的机理。结果表明:陶瓷抛光渣能有效抑制水泥基材料的碱集料反应膨胀,且其抑制作用比矿渣更显著;两种掺合料使集料与胶凝材料界面区结构更密实,界面宽度更小;抛光渣的合理掺量为20%～30%、矿渣掺量应>30%。矿物掺合料抑制碱集料反应的机理为界面过渡区中Ca/Si比降低使集料表面碱度降低,降低了近集料区域生成高Na/Si比膨胀性产物的可能性,并且K+和Al~(3+)在近集料处富集,形成非膨胀性产物。由于体系中Al_2O_3的存在,使K+对碱集料反应的作用低于Na+的作用。
The influence of ceramic polishing powder on the alkali-aggregate reaction of cement-based materials was investigated. The mortar specimens were prepared by replacing 0%, 20%, 30%, and 40% of cement with the same amount of ceramic polishing powder. The expansion rate and strength were measured. The inhibition mechanism of the mineral admixture on the alkali-aggregate reaction was analyzed by scanning electron microscopy and energy disperse spectroscopy. The results show that ceramic polishing powder can restrain alkali-aggregate reaction of cement based materials. The inhibition effect on alkali-aggregate reaction of ceramic polishing powder is greater than that of slag. The mortar specimens modified with the two mixtures have a larger density and a smaller porosity, and the width of interfacial transition zone is narrower. The optimum content of the ceramic polishing powder is 20%–30% and the content of slag is greater than 30% to inhibit the expansion of alkali-aggregate reaction effectively and achieve the requirements of strength as well. Also, the reduction of Ca/Si ratio in the interfacial transition zone can reduce the alkalinity on the surface of aggregate. The possibility of producing expansibility products with a high Na/Si ratio in the aggregate region decreases. The accumulation of K+ and Al~(3+) in the aggregates can generate the non-expansive product, which is the mechanism of the mineral admixture inhibition in the alkali-aggregate reaction. In addition, the effect of K+ on the alkali-aggregate reaction is weaker than that of Na+ due to the existence of Al_2O_3 in the system.
The influence of ceramic polishing powder on the alkali-aggregate reaction of cement-based materials was investigated. The mortar specimens were prepared by replacing 0%, 20%, 30%, and 40% of cement with the same amount of ceramic polishing powder. The expansion rate and strength were measured. The inhibition mechanism of the mineral admixture on the alkali-aggregate reaction was analyzed by scanning electron microscopy and energy disperse spectroscopy. The results show that ceramic polishing powder can restrain alkali-aggregate reaction of cement based materials. The inhibition effect on alkali-aggregate reaction of ceramic polishing powder is greater than that of slag. The mortar specimens modified with the two mixtures have a larger density and a smaller porosity, and the width of interfacial transition zone is narrower. The optimum content of the ceramic polishing powder is 20%–30% and the content of slag is greater than 30% to inhibit the expansion of alkali-aggregate reaction effectively and achieve the requirements of strength as well. Also, the reduction of Ca/Si ratio in the interfacial transition zone can reduce the alkalinity on the surface of aggregate. The possibility of producing expansibility products with a high Na/Si ratio in the aggregate region decreases. The accumulation of K+ and Al~(3+) in the aggregates can generate the non-expansive product, which is the mechanism of the mineral admixture inhibition in the alkali-aggregate reaction. In addition, the effect of K+ on the alkali-aggregate reaction is weaker than that of Na+ due to the existence of Al_2O_3 in the system.
引文
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[17]浙江大学等.硅酸盐物理化学[M].中国建筑工业出版社,1981.
[18]胡明玉.运用模糊神经网络研究碱集料反应和混凝土性能[D].南京:南京工业大学,2003.HU Mingyu.The study on alkali aggregate reaction and performance of concrete by fuzzy neural networks[D].Nanjing:Nanjing Industrial University(in Chinese),2003.
[2]LUMELEY J S.ASR Suppression By Lithium Compounds[J].Cem Concr Res,1997,27(2):235-244.
[3]MC COY W J,CALDWELL A G.New approach to inhibiting alkali-aggregate expansion[J].J Am Concr Inst,1951,22(9):693-706.
[4]俞琛捷,莫祥银,邓敏,等.锂离子在混凝土碱集料反应过程中的作用[J].东南大学学报(自然科学版),2009(1):127-130.YU Chenjie,MO Xiangyin,DENG Min,et al.J Southeast Univ(Nat Sci Ed)(in Chinese),2009,(1):127-130.
[5]HOOTON D H.Canadian use of ground granulated blast-furnace slag as a supplementary cementing material for enhanced performance of concrete[J].CJCE,2000,27(4):754-760.
[6]MALVAR L J,CLINE G D,BURKE D F,et al.Alkali-silica reaction mitigation:state of the art and recommendations[J].ACI Mater J,2002,99(5):480-489.
[7]DUCHESNE J,BéRUBéM A.The effectiveness of supplementary cementing materials in suppressing expansion due to ASR:another look at the reaction mechanisms.Part 1:Concrete expansion and portlandite depletion[J].Cem Concr Res,1994,24(1):73-82.
[8]THOMAS M D A,INNIS F A.Effect of slag on expansion due to alkali-aggregate reaction in concrete[J].ACI Mater J,1998;95(6):716-724.
[9]盖永丰,戴民,张敬会.矿渣在高性能混凝土中的试验研究[J].混凝土,2005(7):67-70.GAI Yongfeng,DAI Min,ZHANG Jinghui.Concrete(in Chinese),2005(7):67-70.
[10]缪松兰,马光华,李清涛,等.建筑陶瓷抛光废渣制备轻质陶瓷材料的研究[J].陶瓷学报,2005,26(2):71-79.MIAO Songlan,MA Guanghua,LI Qingtao,et al.J Ceram(in Chinese),2005,26(2):71-79.
[11]段明磊,肖强,程智清,等.陶瓷抛光粉和石灰石粉双掺对混凝土性能的影响研究[J].混凝土与水泥制品,2013(8):5-8.DUAN Minglei,XIAO Qiang,CHENG Zhiqing,et al.China Concr Cem Prod(in Chinese),2013(8):5-8.
[12]石正国,王黎.陶瓷砖抛光粉在C30混凝土中的应用[J].混凝土,2012(3):138-140.SHI Zhengguo,WANG Li.Concrete(in Chinese),2012(3):138-140.
[13]王功勋,谭琳,聂忆华,等.陶瓷抛光渣对混凝土抗氯离子渗透性能的影响[J].硅酸盐通报,2012(6):1564-1570.WANG Gongxun,TAN Lin,NIE Yihua,et al.Bull Chin Ceram Soc(in Chinese),2012(6):156-1570.
[14]王功勋.陶瓷抛光砖粉作辅助胶凝材料的火山灰性[J].硅酸盐学报,2010,38(7):1229-1234.WANG Gongxun.J Chin Ceram Soc,2010,38(7):1229-1234.
[15]AY N,UNAL M.The use of waste ceramic tile in cement production[J].Cem Concr Res,2000,30(3):497-499.
[16]王功勋,谭琳,田苾,等.陶瓷抛光砖粉与水泥熟料的相互作用[J].硅酸盐通报,2012,31(6):1586-1592.WANG Gongxun,TAN Lin,TIAN Bi,et al.Bull Chin Ceram Soc(in Chinese),2012,31(6):1586-1592.
[17]浙江大学等.硅酸盐物理化学[M].中国建筑工业出版社,1981.
[18]胡明玉.运用模糊神经网络研究碱集料反应和混凝土性能[D].南京:南京工业大学,2003.HU Mingyu.The study on alkali aggregate reaction and performance of concrete by fuzzy neural networks[D].Nanjing:Nanjing Industrial University(in Chinese),2003.