Pan Ye, Lu Zichen, Zhang Liheng, Zhang Hui, Zhang Qin, Sun Zhenping
Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
Shanxi Jiawei New Material Co., Ltd., Yuncheng 044200, China.
Materials (Basel). 2024 Jul 22;17(14):3610. doi: 10.3390/ma17143610.
The feasibility and performance of using calcined coal gangue (CCG) to substitute metakaolin (MK) as the precursor to prepare alkali-activated materials (AAMs) were thoroughly evaluated by conducting combined experiments of flowability test, mechanical measurement, calorimetry and microstructure analysis, etc. It was found that the increased substitution ratio of CCG to MK can increase the flowability of the prepared paste by up to 28.1% and decrease its viscosity by up to 55.8%. In addition, a prolonged setting time of up to 31.8% was found with the increased substitution amount of CCG to MK, which can be attributed to the low reactivity of CCG compared to that of MK. Lastly, even though the presence of CCG can lead to a decrease in the early compressive strength of the hardened paste, a highly recovered long-term mechanical property can be found due to the continuous reaction of CCG. All of these results prove the feasibility of using CCG as one co-blended precursor with MK to prepare alkali-activated materials.
通过进行流动性测试、力学性能测试、量热法和微观结构分析等综合实验，全面评估了用煅烧煤矸石（CCG）替代偏高岭土（MK）作为前驱体制备碱激发材料（AAMs）的可行性和性能。结果发现，CCG对MK的替代比例增加时，所制备浆体的流动性可提高28.1%，粘度可降低55.8%。此外，随着CCG对MK替代量的增加，凝结时间延长了31.8%，这可归因于CCG与MK相比反应活性较低。最后，尽管CCG的存在会导致硬化浆体早期抗压强度降低，但由于CCG的持续反应，其长期力学性能可得到高度恢复。所有这些结果证明了使用CCG作为与MK共混的前驱体之一来制备碱激发材料的可行性。
