Katsiki Antigoni, Hertel Tobias, Tysmans Tine, Pontikes Yiannis, Rahier Hubert
Department of Materials and Chemistry (Physical Chemistry and Polymer Science), Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.
Department of Materials Engineering, KU Leuven, 3001 Heverlee, Belgium.
Materials (Basel). 2019 Jan 31;12(3):442. doi: 10.3390/ma12030442.
This work aims to study an aluminosilicate phosphate cementitious matrix. The cementitious matrix was studied on paste samples. The synthesis of metakaolinite phosphate cement (MKPC) was investigated using calorimetric techniques. A systematic study was performed by emphasizing a broad range of Al/P molar ratios, covering the different behavior of the material to the extremes, as well as the optimum composition. X-ray diffraction and scanning electron microscopy revealed that the final structure was mainly an amorphous network, albeit with some non-reacted phases. The compressive strength was studied on mortars using a cement/sand ratio of 1:3. MKPC specimens with Al/P ratios close to 1/1 showed optimal behavior. MKPCs with Al/P ratios above 1/1 were characterized by high porosity and low strength, whereas MKPCs with Al/P < 1 contained an excess of phosphates. The influence of the Al/P molar ratio on compressive strength was also studied, reaching a maximum of 68 MPa for the optimum composition. Based on the results, MKPC may be a promising candidate for construction purposes.
本研究旨在探究一种铝硅酸盐磷酸盐胶凝基体。该胶凝基体是在膏体样品上进行研究的。采用量热技术对偏高岭土磷酸盐水泥（MKPC）的合成进行了研究。通过强调一系列广泛的Al/P摩尔比进行了系统研究，涵盖了材料在极端情况下的不同行为以及最佳组成。X射线衍射和扫描电子显微镜显示，最终结构主要是无定形网络，尽管存在一些未反应相。使用1:3的水泥/砂比对砂浆的抗压强度进行了研究。Al/P比接近1/1的MKPC试样表现出最佳性能。Al/P比高于1/1的MKPC具有高孔隙率和低强度的特点，而Al/P < 1的MKPC含有过量的磷酸盐。还研究了Al/P摩尔比对抗压强度的影响，最佳组成的抗压强度最高可达68MPa。基于这些结果，MKPC可能是用于建筑目的的一种有前景的材料。
