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含碱矿物碱性环境下分解的热力学分析
作者:王玉江 余桂郁 邓敏 唐明述  
单位: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 南京工业大学材料科学与工程学院 南京210009 洛阳工业高等专科学校 河南洛阳471003 南京210009 南京210009 南京210009 
关键词:热力学  碱硅酸反应  含碱矿物  集料   
分类号:TU528.01
出版年,卷(期):页码:2006,34(3):345-352
DOI:
摘要:
应用热力学方法探讨了298K时钾长石、钠长石、霞石等含碱矿物在碱性环境下的碱析出能力,并对这些含碱矿物分解析出的碱对碱硅酸反应的影响进行了讨论。结果表明在pH值大于13的碱性环境下,各含碱矿物最大析碱能力顺序依次为片铝钠石>白榴石>霞石>脱水方沸石>钠云母>白云母>硬玉>钠长石>钾长石;随着溶液pH值增大,片钠铝石、霞石分解能力略有降低,而集料中常见的钠长石、钾长石矿物的分解析碱能力则显著提高。此外,根据热力学分析结果,提出降低孔溶液碱度、采用低的水灰比以及控制外部水分进入孔溶液是抑制集料碱析出的有效措施,研究结果为相应的碱集料反应抑制措施的提出提供了理论依据。
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The dissolution reactions of alkaline minerals in alkali solution were studied by the thermodynamic method, and the capacities of alkali released from alkaline minerals and their effect on alkalisilica reactions (ASR) were analyzed also. The results indicate that the sequence of capacity in alkali released from alkaline minerals is dawsonite>leucite>nepheline>dehydration analcime>paragonite>muscovite>jadeite>Nafeldspar>Kfeldspar in alkali solution with a pH value higher than 13. With the increase of OH-concentration in alkali solution, the dissolution degree of the common minerals in aggregates such as Nafeldspar and Kfeldspar are increased remarkably, but the dissolution degree of dawsonite and nepheline are decreased slightly. Furthermore, it is pointed out that decreasing the pH value of the pore solution and preventing water from entering into the pore solution may be suitable way to restrain alkali from being released from the aggregate. The theoretical principle is introduced for inhibiting ASR according to the thermodynamic analysis.
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基金项目:
国家自然科学基金(59672021)资助项目。
作者简介:
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参考文献:
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