Sewage sludge recycling with use of chemical stabilization method

Abstract Increasing demand for road construction materials has led to a search for innovative solutions to limit costs and conserve natural resources. Establishing efficient motorway networks is crucial for a nation's economic progress, necessitating the exploration of alternatives to natural materials. Recycling, a method commonly applied to waste reduction, is gaining traction in civil engineering. It diminishes resource demand, limits energy expenses, and repurposes waste that would otherwise occupy landfills. Soil stabilization, a key component of road construction, aims to enhance soil’s load-bearing capacity. This process mitigates undesirable properties and decreases permeability, making soils more suitable for road infrastructure. This article presents laboratory findings on the application of sewage sludge (SS) in soil stabilization, aiming to determine the optimal SS percentage for effective stabilization. The study utilized sewage sludge alongside fly ash and blast furnace slag using NaOH as a stabilization agent, which triggers the geopolymerization effect, investigating different mix ratios and curing times. The results showed strength development and properties suitable for road construction. The study provides a significant contribution to the potential reuse of sewage sludge and its incorporation into road stabilization processes.