A Review Study on Performance Improvement of Coal Gangue as Coarse Aggregate in Concrete

The use of coal gangue as coarse aggregate alleviates the dependence of concrete on natural aggregates and improves the utilization rate of coal gangue resources. The direct use of coal gangue coarse aggregate in the preparation of concrete limits the scope of its use due to the deterioration of its performance. Therefore, the improvement of the performance of coal gangue coarse aggregate concrete should become a research focus. This article briefly describes the basic characteristics that coal gangue coarse aggregate should have and the shortcomings of existing research. It summarizes the existing methods for improving the performance of coal gangue coarse aggregate concrete. After pre wetting treatment, calcination, slurry coating, and material adjustment, the performance of coal gangue coarse aggregate concrete is improved. Multiple methods of collaborative treatment can improve the comprehensive performance of coal gangue coarse aggregate concrete, to provide some reference for achieving efficient utilization of coal gangue.