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以活性度为50 s的氧化镁膨胀剂样品M50为对象,探讨了水合法测试Mg O含量的合理性,并通过外掺粉状菱镁矿模拟氧化镁膨胀剂中所存在的部分未分解的Mg CO3,外掺分析纯Mg(OH)2模拟氧化镁膨胀剂受潮后水化生成的Mg(OH)_2,对比研究了化学分析法和水合法测试氧化镁膨胀剂中Mg O含量的差异性,以及两种测试方法测得氧化镁膨胀剂中Mg O含量与其膨胀性能的关系。结果表明:化学分析方法无法排除氧化镁膨胀剂中未分解Mg CO3和已受潮Mg(OH)2的影响,水合法可准确测试样品中能参与水化的Mg O的量,并能排除氧化镁膨胀剂中未分解Mg CO3和已受潮Mg(OH)_2的影响,与化学分析法相比,水合法测得的氧化镁膨胀剂中Mg O含量与其膨胀性能更相关。
In this paper, the M50 content of magnesia expansive agent with activity of 50 s was studied. The rationality of hydration test for MgO content was explored. Partially undecomposed magnesia expanders Mg (OH) 2 was synthesized by hydrated Mg (OH) 2 mixed with pure Mg (OH) 2 simulating magnesia expansive agent. The chemical analysis and hydration test were used to test the difference of MgO content in magnesia expansive agent , As well as the relationship between MgO content and swelling property of magnesia expansion agent measured by two test methods. The results show that the chemical analysis method can not exclude the influence of undissolved MgO3 and damp Mg (OH) 2 in the magnesia expansion agent. The hydration method can accurately measure the amount of MgO in the sample that can participate in the hydration and can exclude magnesium oxide Expansion agent undissolved Mg CO3 and damp Mg (OH) _2 effect, compared with the chemical analysis, hydration MgO measured in the magnesia expansion agent and its expansion properties are more relevant.