Experimental study of phosphate salts influencing properties of magnesium phosphate cement
Experimental study of phosphate salts influencing properties of magnesium phosphate cement
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DOI：
10.1016/j.conbuildmat.2014.05.021
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发表时间：
2014-08-29
影响因子：
7.4
通讯作者：
Chen Bing
中科院分区：
文献类型：
--
作者：
Fan Shijian;Chen Bing
以重烧氧化镁和磷酸二氢铵（NH4H2PO4）、磷酸二氢钾（KH2PO4）等磷酸盐为原料制备磷酸镁水泥（MPC）。不同磷酸盐制备的MPC性能差异较大。本文研究了MgO与磷酸二氢铵、磷酸二氢钾或两者混合制备的MPC的结晶动力学、力学性能和相组成。此外，还研究了三磷酸钠（Na5P3O10）对MPC显微结构和力学性能的影响。结果表明，磷酸二氢铵制备的MPC的早期强度和水化温度明显高于磷酸钾镁，而磷酸钾镁制备的MPC的强度发展更好。磷酸二氢铵和磷酸二氢钾等量混合制备的MPC强度高于磷酸铵镁和磷酸钾镁单独制备的MPC强度。三聚磷酸钠的加入显著提高了MPC的力学性能。它还缩短了凝固时间。最后，采用X射线衍射（XRD）和扫描电镜（SEM）对MPC浆料的反应产物及其微观形貌进行了分析。(C)2014爱思唯尔有限公司版权所有。
Magnesium phosphate cement (MPC) was prepared with dead burned magnesia oxide and phosphate salts, such as ammonium dihydrogen phosphate (NH4H2PO4) and potassium dihydrogen phosphate (KH2PO4). The properties of MPC prepared with varied phosphate salts were of much difference. In this paper the exothermia kinetics, mechanical properties and phase compositions of MPC prepared by mixing MgO with either ammonium dihydrogen phosphate or potassium dihydrogen phosphate, or a combination of both were studied. Besides, the effects of sodium triphosphate (Na5P3O10) on the microstructure and mechanical properties of MPC were also investigated. The results revealed that MPC prepared with ammonium dihydrogen phosphate exhibited substantially higher early strength and hydration temperature than that of magnesium potassium phosphate, while the later demonstrated better strength development. The strength of MPC prepared with equivalent mixture of ammonium dihydrogen phosphate and potassium dihydrogen phosphate was higher than that of MPC containing magnesium ammonium phosphate or magnesium potassium phosphate only. Moreover, the testing presented that the addition of sodium triphosphate improved the mechanical properties of MPC significantly. It also prolongs the setting time. Finally, the reaction products and their micro-morphology of MPC paste were examined and analyzed by X-ray diffraction (XRD) and Scanning Electronic Microscopic (SEM). (C) 2014 Elsevier Ltd. All rights reserved.