This study explored the feasibility of utilizing lowly-reactive coal gasification fly ash (CGFA) for stabilizing road aggregate bases. Three types of aggregate stabilizers including the ordinary Portland cement (OPC)-CGFA, hydrated lime (CH)-CGFA and alkali-activated CH-CGFA were evaluated based on the performances of compacted base specimens. It was found that the OPC-CGFA stabilized bases showed better mechanical and durability properties while the CH-CGFA samples had low water stability and freeze-thaw durability due to the dissolution of unreacted CH. However, the reaction degree of CGFA associated with the performances of CH-CGFA stabilization could be considerably enhanced by the alkali-activation. The sustainability and economic feasibility analyses showed the use of CGFA could significantly reduce the CO₂ emissions and costs, highlighting the synergy between the recycling of CGFA and the construction of sustainable road bases. A framework of selecting CGFA-based stabilizers for road bases was proposed considering the performance ratings of the material properties.

本研究探讨了利用低反应性煤气化粉煤灰 (CGFA) 稳定道路骨料基层的可行性。根据压实基础试件的性能，对普通波特兰水泥（OPC）-CGFA、熟石灰（CH）-CGFA和碱活化CH-CGFA三种骨料稳定剂进行了评价。发现 OPC-CGFA 稳定的碱具有更好的机械性能和耐久性能，而 CH-CGFA 样品由于未反应的 CH 溶解而具有较低的水稳定性和冻融耐久性。然而，与 CH-CGFA 稳定性能相关的 CGFA 的反应程度可以通过碱活化显着提高。可持续性和经济可行性分析表明，使用 CGFA 可以显着减少 CO ₂排放和成本，突出了 CGFA 回收利用与可持续道路基础建设之间的协同作用。考虑到材料性能的性能等级，提出了为路基选择基于 CGFA 的稳定剂的框架。