Azimi Emy Aizat, Abdullah Mohd Mustafa Al Bakri, Vizureanu Petrica, Salleh Mohd Arif Anuar Mohd, Sandu Andrei Victor, Chaiprapa Jitrin, Yoriya Sorachon, Hussin Kamarudin, Aziz Ikmal Hakem
Center of Excellence Geopolymer and Green Technology, School of Materials Engineering, Universiti Malaysia Perlis (UniMAP), P.O. Box 77, D/A Pejabat Pos Besar, 01000 Kangar, Perlis, Malaysia.
Faculty of Materials Science and Engineering, "Gheorghe Asachi" Technical University, Blvd. D. Mangeron 71, 700050 lasi, Romania.
Materials (Basel). 2020 Feb 24;13(4):1015. doi: 10.3390/ma13041015.
A geopolymer has been reckoned as a rising technology with huge potential for application across the globe. Dolomite refers to a material that can be used raw in producing geopolymers. Nevertheless, dolomite has slow strength development due to its low reactivity as a geopolymer. In this study, dolomite/fly ash (DFA) geopolymer composites were produced with dolomite, fly ash, sodium hydroxide, and liquid sodium silicate. A compression test was carried out on DFA geopolymers to determine the strength of the composite, while a synchrotron Micro-Xray Fluorescence (Micro-XRF) test was performed to assess the elemental distribution in the geopolymer composite. The temperature applied in this study generated promising properties of DFA geopolymers, especially in strength, which displayed increments up to 74.48 MPa as the optimum value. Heat seemed to enhance the strength development of DFA geopolymer composites. The elemental distribution analysis revealed exceptional outcomes for the composites, particularly exposure up to 400 °C, which signified the homogeneity of the DFA composites. Temperatures exceeding 400 °C accelerated the strength development, thus increasing the strength of the DFA composites. This appears to be unique because the strength of ordinary Portland Cement (OPC) and other geopolymers composed of other raw materials is typically either maintained or decreases due to increased heat.
地质聚合物被认为是一项正在兴起的技术，在全球具有巨大的应用潜力。白云石是一种可直接用于生产地质聚合物的材料。然而，白云石作为地质聚合物的反应活性较低，导致其强度发展缓慢。在本研究中，采用白云石、粉煤灰、氢氧化钠和硅酸钠溶液制备了白云石/粉煤灰（DFA）地质聚合物复合材料。对DFA地质聚合物进行了抗压试验，以确定复合材料的强度，同时进行了同步辐射微X射线荧光（Micro-XRF）试验，以评估地质聚合物复合材料中的元素分布。本研究中施加的温度使DFA地质聚合物具有良好的性能，尤其是强度，其强度增量高达74.48MPa为最佳值。热量似乎促进了DFA地质聚合物复合材料的强度发展。元素分布分析显示复合材料有优异的结果，特别是在高达400℃的温度下，这表明DFA复合材料具有均匀性。超过400℃的温度加速了强度发展，从而提高了DFA复合材料的强度。这似乎很独特，因为普通硅酸盐水泥（OPC）和其他由其他原材料组成的地质聚合物的强度通常会因热量增加而保持不变或降低。
