Experimental study of magnesia and M/P ratio influencing properties of magnesium phosphate cement
Experimental study of magnesia and M/P ratio influencing properties of magnesium phosphate cement
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DOI：
10.1016/j.conbuildmat.2014.04.136
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发表时间：
2014-08-29
影响因子：
7.4
通讯作者：
Bing, Chen
中科院分区：
文献类型：
--
作者：
Yue, Li;Jia, Sun;Bing, Chen
将MgO粉（M）、KH_2PO_4粉（P）和K2PO_4粉（B）混合制成磷酸镁水泥（MPC）。为了研究煅烧氧化镁对MPC抗压强度和抗折强度的影响，对两种氧化镁在不同温度下进行煅烧，并对其化学和物理性能进行分析。将煅烧氧化镁与粉煤灰、缓凝剂混合制备MPC。提出了氧化镁的选择原则，以优化MPC的物理和化学性能。实验结果表明，随着煅烧温度的升高，氧化镁的粒径逐渐增大。煅烧温度对轻质氧化镁的化学组成影响不大，但对轻质氧化镁的影响很大。测试了MPC的抗压强度和抗折强度，并利用XRD和SEM分析了MPC的微观结构。试验结果表明，在一定范围内，抗压强度随煅烧温度的升高而增大。当磷酸盐与MgO的摩尔比为1/4 ~ 1/5时，抗压强度最大。在一定范围内，随着粉料比的降低，MPC的抗弯强度增加，并保持在一定的水平。(C)2014爱思唯尔有限公司版权所有。
Magnesium phosphate cement (MPC) is prepared by mixing MgO powder (M) with KH2PO4 powder (P) and borax powder (B). To investigate the influence of calcined magnesia on the compressive and flexural strength of MPC, two types of magnesia were calcinated under different temperatures, and the chemical and physical properties were analysed. The MPC was prepared by mixing calcinated magnesia with fly ash and retarder. The selection principle of magnesia was proposed to optimise the physical and chemical properties of the MPC. The experimental results demonstrate that the increasing calcination temperature led to the increasing particle size of the magnesia. The calcination temperature had a significant influence on the light magnesia and had no effect on its chemical composition. The compressive and flexural strength of the MPC was tested, and its microstructure was analysed using XRD and SEM methods. The testing results demonstrate that within a certain range, the compressive strength increased with an increasing calcination temperature. The compressive strength was the maximum when the mole ratio of phosphate to MgO was 1/4-1/5. In a certain range, as the P/M decreased, the flexural strength of the MPC increased and subsequently remained at a certain level. (C) 2014 Elsevier Ltd. All rights reserved.