Choi Young-Cheol
Department of Civil and Environmental Engineering, Gachon University, Seongnam 13120, Gyeonggi-do, Republic of Korea.
Materials (Basel). 2025 Jun 10;18(12):2731. doi: 10.3390/ma18122731.
Circulating fluidized bed combustion (CFBC) ash, a byproduct typically generated from coal-fired CFBC power plant boilers, contains high content of free lime and anhydrite. Due to its chemical composition, CFBC ash exhibits self-cementing properties; however, its performance is limited. One approach to enhancing the self-cementing properties of CFBC ash is through the incorporation of mineral admixtures such as gypsum. This study investigated the influence of desulfurization gypsum (DG) on the self-cementing behavior of CFBC ash. To this end, paste and mortar specimens were prepared and evaluated for their hydration and mechanical characteristics. The hydration behavior was analyzed using isothermal calorimetry, thermogravimetric analysis (TGA), setting time measurements, and X-ray diffraction (XRD) analysis. Mechanical properties were assessed by measuring the compressive strength at various curing ages. Additionally, changes in microstructure were examined by evaluating the pore size distribution through mercury intrusion porosimetry (MIP). The experimental results indicate that the appropriate incorporation of DG enhances the hydraulic reactivity of CFBC ash and significantly improves the compressive strength.
循环流化床燃烧（CFBC）灰是燃煤CFBC电厂锅炉通常产生的一种副产品，含有高含量的游离石灰和硬石膏。由于其化学成分，CFBC灰具有自胶凝特性；然而，其性能有限。增强CFBC灰自胶凝特性的一种方法是加入矿物掺合料，如石膏。本研究调查了脱硫石膏（DG）对CFBC灰自胶凝行为的影响。为此，制备了浆体和砂浆试件，并对其水化和力学特性进行了评估。使用等温量热法、热重分析（TGA）、凝结时间测量和X射线衍射（XRD）分析来分析水化行为。通过测量不同养护龄期的抗压强度来评估力学性能。此外，通过压汞法（MIP）评估孔径分布来检查微观结构的变化。实验结果表明，适量掺入DG可提高CFBC灰的水硬活性，并显著提高抗压强度。
