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轻烧氧化镁对地质聚合物变形行为的影响及机理

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Abstract:

为探索地质聚合物收缩补偿途径,研究了不同MgO掺量地质聚合物试体在不同养护条件(室温和38℃,相对温度RH>95%)下的变形行为,并采用X射线衍射、热重分析等测试方法研究掺入MgO地质聚合物的组成,分析了MgO影响地质聚合物变形行为的机理。结果表明MgO对地质聚合物的变形行为有明显影响,且随养护条件不同而差异显著;掺入MgO可减小地质聚合物同龄期试体收缩,且掺量越大,减缩越大,但在通常养护条件下均没有表现出在波特兰水泥体系中显著的收缩补偿效应。MgO在地质聚合物中参与反应,且在不同养护条件下的反应机制有显著差异常温条件下MgO优先与游离的[SiO4]4–反应生成高吸水性的硅酸镁凝胶;提高养护温度更利于促进地质聚合反应,加速对[SiO4]4–的消耗,从而抑制硅酸镁凝胶的形成

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