Experimental Study on Mechanical Properties of Pavement Base with All Solid Waste Mixture Stabilized by Mineral Powder

Abstract:

To enhance the utilization rate of industrial solid waste, a study was conducted on the mechanical properties of stabilized pavement base mixtures using granulated blast furnace slag powder as the binder, with the full solid waste (steel slag, coal gangue, and recycled powder) as the raw material. The uniform design method was employed, with the proportions of steel slag, coal gangue, and recycled powder as factors, and the 7-day unconfined compressive strength, 120-day compressive rebound modulus, and 120-day splitting strength as the target response values. Six sets of test mix ratios (mass ratios) were designed for the experiments, and the test results were analyzed using JMP software. A mathematical model was established between the different material proportions and the three mechanical performance indicators. The mixed material’s splitting fracture surface images were processed using Image J software to reveal the main reasons for the mechanical strength at the micro level. The research results show that the mechanical properties of the mixture increase with the increase in steel slag proportion; the increase in recycled powder proportion has an adverse effect on the initial mechanical strength of the mixture, but the later mechanical strength shows a trend of increasing first and then decreasing with the increase in recycled powder proportion, so its proportion should not exceed 35%. The regression equation obtained through variance analysis has a high fitting degree and can provide guidance for practical engineering.