Experimental research of water stability of magnesium alumina phosphate cements mortar
Experimental research of water stability of magnesium alumina phosphate cements mortar
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磷酸镁铝水泥砂浆水稳定性试验研究
DOI：
10.1016/j.conbuildmat.2015.06.050
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发表时间：
2015-09-30
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
磷酸镁骨水泥具有固化快、早期强度高、粘接性能好、生物相容性好等特点，在土木工程中作为快凝修复材料或在生物医学中作为可注射生物材料得到了广泛应用。然而，据报道，MPC也具有水不稳定的缺点。本文以重烧氧化镁和磷酸盐为原料，通过添加氧化铝和膨胀剂制备了磷酸铝镁水泥砂浆，研究了氧化铝对磷酸铝镁水泥水稳定性的影响。测试了不同固化条件下的机械强度的发展和强度保持率，并用于反映氧化铝的有效性。通过扫描电子显微镜-能量色散谱仪（SEM-EDs）、X射线衍射（XRD）和压汞法（MIP）对MAPCs硬化浆体进行了表征，为反应动力学研究提供了详细的信息。结果发现，氧化铝的掺入导致抗压强度的显着增加和显着改善的耐水性所示的增强强度保留。此外，观察到孔隙率和大尺寸孔体积两者的减少。XRD和SEM分析结果表明，反应产物的溶解性降低，填充了孔隙，阻碍了水从内部反应产物中侵入。(C)2015爱思唯尔有限公司版权所有。
Magnesium phosphate cements are characteristics of fast setting, high early strength, adhesive properties and good biological compatibility, and have been extensively used as fast setting repair materials in civil engineering or injectable biomaterials in biomedical application. However, MPCs were also reported to have the drawback of water instability. In the present work, magnesium alumina phosphate cement mortars based on dead burnt magnesia and phosphates were prepared with the additions of alumina and extenders to study the effect of alumina on the water stability of MPCs. The development of mechanical strengths under different curing conditions and strength retention were tested and used to reflect the effectiveness of alumina. The hardened MAPCs pastes were examined through the techniques of Scanning Electronic Microscopic-Energy Dispersive Spectrometer (SEM-EDs), X-ray diffraction (XRD) and mercury intrusion porosimetry (MIP), which provided detailed information for the reaction kinetics investigation. It is found that the incorporation of alumina led to a significant increase in compressive strength and a pronounced improvement in water resistance as indicated by the enhancement of strength retention. Furthermore, a reduction in both of porosity and large size pore volume were observed. The XRD patterns and SEM microphotographs indicated that less dissolvable product was yielded to fill up the pores and hinder the intrusion of water from the inner reaction products. (C) 2015 Elsevier Ltd. All rights reserved.