A Study of Innovative Alkali-Activated Binders for Soil Stabilisation in the Context of Engineering Sustainability and Circular Economy

Abstract In the context of sustainability in civil engineering industry, chemical ground improvement is becoming increasingly used, as a generally more sustainable alternative to replacing and landfilling unsuitable for construction ground. However, traditional soil stabilisers such Portland cement or lime are not environmentally impact-free; international research effort thus focusing on development innovative cementing agents. This paper presents results from feasibility study suitable alkali-activated slag cements stabilisation two soils. A number alkali-activators were considered, comprising potassium hydroxide, range alkali salts, well material retrieved waste (Paper Sludge Ash, PSA) which contains free lime. Indicative an extensive parametric terms unconfined compressive strength (UCS) shown, followed by ongoing oedometer tests determine compressibility some preliminary selected soil/binder mixes observe durability wetting-drying cycles. Overall, all increased UCS stiffness soil. Carbonates Na 2 SiO 3 used their own gave lower increases. The highest strengths achieved AAC with KOH Ca(OH) PSA, showed similar gain. latter has shown consistently lot promise strength, volumetric stability treatment durability. Ongoing focuses further mix optimisation comprehensive mechanical property testing supported analysis (mineralogical, microstructural) gain better understanding complex mechanisms involved.