Chhaiba Salma, Martinez-Sanchez Sergio, Husillos-Rodriguez Nuria, Palomo Ángel, Kinoshita Hajime, Garcia-Lodeiro Inés
Eduardo Torroja Institute for Construction Science (IETcc-CSIC), 28033 Madrid, Spain.
Department of Material Science and Engineering, University of Sheffield, Sheffield S10 2TN, UK.
Materials (Basel). 2024 Aug 28;17(17):4252. doi: 10.3390/ma17174252.
Magnesium phosphate cements (MPCs), also known as chemically bonded ceramics, represent a class of inorganic cements that have garnered considerable interest in recent years for their exceptional properties and diverse applications in the construction and engineering sectors. However, the development of these cements is relatively recent (they emerged at the beginning of the 20th century), so there are still certain aspects relating to their durability that need to be evaluated. The present work analyses the chemical durability of magnesium potassium phosphate cements (MKPCs) during 1 year of immersion in three leaching media: seawater, a NaSO solution (4% by mass) and deionized water. For this, pastes of prismatic specimens of MKPC, prepared with different M/P ratio (2 and 3), were submitted to the different chemical attacks. At different ages, the changes on the mechanical strengths, microstructure (BSEM, MIP) and mineralogy (XRD, FTIR, TG/DTG) were evaluated. The results obtained indicate that, in general terms, MKPC systems show good behavior in the three media, with the more resistant system being the one prepared with a M/P molar ratio of 3.
磷酸镁水泥（MPC），也被称为化学键合陶瓷，是一类无机水泥，近年来因其优异的性能以及在建筑和工程领域的广泛应用而备受关注。然而，这些水泥的发展相对较新（它们在20世纪初出现），因此仍有一些与它们的耐久性相关的方面需要评估。本研究分析了磷酸镁钾水泥（MKPC）在三种浸出介质（海水、质量分数为4%的NaSO溶液和去离子水）中浸泡1年期间的化学耐久性。为此，制备了不同M/P比（2和3）的MKPC棱柱形试样糊剂，并使其遭受不同的化学侵蚀。在不同龄期，评估了其力学强度、微观结构（背散射扫描电子显微镜、压汞法）和矿物学（X射线衍射、傅里叶变换红外光谱、热重/微商热重）的变化。所得结果表明，总体而言，MKPC体系在这三种介质中表现良好，其中M/P摩尔比为3制备的体系耐久性更强。
