Study on applicability of coal gangue at base layer of navigation airport pavement Available to Purchase

Coal gangue is a waste from coal mining and lacks application research in airport runway construction. Referring to the requirements of the airport pavement for the basement, the applicability of a coal gangue through physical and mechanical indicators is analyzed in the navigation airport. The experiments mainly includes the coal gangue self- stability test: gradation, loss on ignition, expansion ratio, crush value, boundary moisture content; Coal gangue mixture strength and stability experiment: 7d unconfined compressive strength and water stability experiment. The results show that: Based on the gangue material, the sum of the content of SiO₂, Al₂O₃ and Fe₂O₃ is more than 70%, and the loss on ignition is less than 15%, which can reach the control standard. The gradation of the crushing treatment is good, and the expansion ratio is not more than 0.5%. The coal gangue has good stability. By adjusting the gangue grading, the residual compressive strength of the mixture of 5% cement after a certain dry and wet cycle is 3.4 MPa, which can meet the strength grade requirements of the base layer of the navigable airport. The above conclusions can provide reference for the application of coal gangue in the field of airport construction.