Solid waste material reuse analysis: filling the road subgrade with riverway silt and sediment

Abstract

This study proposes to explore solid waste material (SWM) reuse with the riverway silt and sediment, and examines the impacts of chemical composition on the road construction through sensitivity analysis. Considering the characteristics of silt mixture, it is necessary to investigate the modi ed materials to improve the mechanical feasibility for subgrade lling. In this study, modi cation schemes for construction waste and garbage slag presented well mechanical properties and environmental bene ts in sensitivity analysis, especially for the high-water content silt modi ed by the garbage slag and lime mixture. The results indicate the lime-improved silt with medium water content is a cheap and highperformance material compared to the original silt. Moreover, modi ed silt demonstrated superior features in particle size, permeability and bearing capacity. Among six lime-improving schemes, the California bearer ratio (CBR 2.5 ) increased from 7.1 to 19.6, while the minimum CBR 2.5 was 2.45 times to the original silt. At last, this study proposes the engineering measures to improve the silt mixture subgrade to prevent heavy metals from polluting the water and soil environment. Further implications were also discussed.

Assessment of Engineering Behavior and Water Resistance of Stabilized Waste Soils Used as Subgrade Filling Materials

“…After undergoing lime treatment, soils that contain a large amount of clay minerals exhibit significant improvements in their physical and mechanical properties, including compaction and consolidation properties, compressive and shear strength, swelling and shrinking deformation, durability and micro-pore structure, etc. [8][9][10][11][12][13][14], and the bearing capacity is one of the key mechanical properties for subgrade filler [15][16][17].…”