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碱活性集料在不同碱液中压蒸后产物的研究
作者:梅来宝 卢都友 邓敏 唐明述 
单位:南京工业大学理学院 南京工业大学材料科学与工程学院 南京工业大学材料科学与工程学院 南京工业大学材料科学与工程学院 南京210009  南京210009  南京210009  南京210009 
关键词:碱-集料反应  碱硅酸反应  碱碳酸盐反应  显微结构  氢氧化锂 
分类号:TQ172
出版年,卷(期):页码:2005,33(4):467-476
DOI:
摘要:
通过X射线衍射及扫描电镜/能谱分析法对2 种典型的碱硅酸活性集料(Spratt limestone, SL)和碱碳酸盐活性集料(Pittsburglimestone ,PL)在KOH,NaOH及LiOH溶液中于150 ℃压蒸150 h后的产物进行了研究,结果表明: NaOH对2种集料有最强的腐蚀作用,腐蚀作用最弱的是LiOH。2种集料在不同的碱介质中压蒸后,产物的结晶度、形貌及分布是不同的。PL在碱液中除了去白云化反应外,PL中的隐晶石英也与KOH和NaOH反应生成典型的碱硅酸产物,与LiOH反应形成硅酸锂。SL在不同碱液中除生成大量碱硅酸产物外,SL中的少量的白云石在碱溶液中也发生了去白云石化反应,对膨胀作出贡献。
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Products of typical aggregates with alkalisilica reactivity, Spratt limestone (SL), and alkalicarbonate reactivity, Pittsburg limestone (PL), after autoclaved in KOH, NaOH and LiOH solutions at 150 ℃ for 150 h were studied by means of X-ray diffraction and scanning electron microscope/energy dispersive spectrometry. Results indicate that NaOH exhibits the strongest corrosive effect on both aggregates, while LiOH exhibits the weakest corrosive effect. The crystalline degree, morphology and distribution of pro-ducts are quite different for both aggregates autoclaved in different alkali solutions. Except the dedolomitization of PL in alkali solutions, cryptocrystalline quartz in PL also react with NaOH, KOH to produce typical (alkali)silica product and to form lithium silicate reactes with LiOH. Besides massive alkalisilica products formed in SL autoclaved in different alkali solutions, small amount of dolomite existed in SL are also dedolomitized in alkali solution, which is contributed to expansion.
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参考文献:
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