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本文通过正交实验法研究了温度、MgCl_2浓度、MgO/MgCl_2摩尔比对氯氧镁水泥(MOC,下称镁水泥)强度的影响,用极差分析和方差分析讨论了各因素对强度的影响规律,并利用曲线估计预测了镁水泥强度随龄期变化的发展规律。研究表明,在室温下(20℃)、MgCl_2浓度为24%、MgO/MgCl_2摩尔比为6时,镁水泥的强度最高;温度对镁水泥强度的影响较大,MgO/MgCl_2摩尔比次之,MgCl_2浓度对强度的影响较小;随着温度的升高,镁水泥的早期强度逐渐降低,在40℃左右时,略有提高但幅度不大;随着MgCl_2浓度逐渐提高,镁水泥的强度逐渐增大,达到24%左右时,28 d强度基本保持不变;随着MgO/MgCl_2摩尔比的增大,镁水泥的强度逐渐增大;镁水泥的强度随龄期的变化呈S型增长。采用多元二次回归研究各因素间的交互作用对镁水泥强度和软化系数的影响。
In this paper, the effects of temperature, MgCl 2 concentration and MgO / MgCl 2 molar ratio on the strength of magnesium oxychloride cement (MOC) were studied by orthogonal experiment. The effects of various factors on the strength were discussed using range analysis and variance analysis Regularity, and using curve estimation to predict the development of magnesium cement with age. The results show that the strength of magnesium cement is the highest when the concentration of MgCl 2 is 24% and the molar ratio of MgO / MgCl 2 is 6 at room temperature (20 ℃). The temperature has greater influence on the strength of magnesium cement, and the molar ratio of MgO / MgCl 2 is second, MgCl 2 concentration had little effect on the strength. With the increase of temperature, the early strength of magnesium cement gradually decreased, but slightly increased at 40 ℃, but the magnitude was not large. With the increasing of MgCl 2 concentration, the strength of magnesium cement gradually increased The strength of magnesium cement gradually increases with the increase of MgO / MgCl 2 molar ratio. The strength of magnesium cement shows an S-type growth with age. The effects of various factors on the strength and softening coefficient of magnesium cement were studied by multivariate quadratic regression analysis.