In this paper, changes in the compressive strength, microstructure and magnetic properties of a high-calcium fly ash geopolymer subjected to elevated temperatures were studied. Geopolymer paste specimens were exposed to temperatures of 60, 200, 400, 600, 800, 1000 and 1200 °C with an increase rate of 5 °C/min, followed by a 60 min calcination period and natural convection cooling to ambient temperature for each cycle. The compressive strength of the geopolymer paste after being subjected to the temperature of 200 °C was increased due to further geopolymerization reaction. It was reduced at higher temperatures due to several factors such as dehydration, crack and disintegration of the geopolymer gel. The structural analysis indicated new phases formation especially at 800 °C. The magnetic properties of the high calcium geopolymer paste remained relatively unchanged up to 600 °C. After that, they decreased significantly with increasing temperature and switched from ferromagnetic to paramagnetic.

本文研究了高温下高钙粉煤灰地质聚合物的抗压强度，微观结构和磁性能的变化。将地质聚合物糊状样品暴露于60、200、400、600、800、1000和1200°C的温度下，升温速率为5°C / min，然后煅烧60分钟，然后自然对流冷却至室温周期。由于进一步的地质聚合反应，在经受200°C的温度后，地质聚合物浆料的抗压强度提高了。由于诸如地质聚合物凝胶的脱水，破裂和崩解等多种因素，它在较高的温度下降低了。结构分析表明，特别是在800°C时会形成新的相。高达600°C时，高钙地质聚合物浆料的磁性能保持相对不变。此后，它们随着温度的升高而显着下降，并从铁磁性转变为顺磁性。