Use of Waste Gypsum, Reclaimed Asphalt Filler, and GGBS as a Full Replacement of Cement in Road Base

Laboratory experiments were used to determine the suitability of raw industrial by-products obtained within United Kingdom that are being taken landfill sites and develop a hydraulically bound cementitious material for applications in road (base), foundation, subgrade pavement construction. The predominantly sourced locally. Tests carried out mechanical stability by-product binders performance determined strength development by time. High-pressure permeability tests performed materials, frost susceptibility conducted freeze–thaw resistance materials. Compressive at 7, 14, 28, 90, 180 days age. Strength on hydraulic paste was slow during early stages hydration mixtures containing 40%–60% ground granulated blast furnace slag (GGBS). After 28 up 90 when ultimate achieved, increased with presence GGBS 60%. Ternary proportions 20% plasterboard waste gypsum (PWG); reclaimed asphalt filler (RAF), 60% GGBS, 10% vitamin B5 (V-B5G); 30% RAF; attained highest compressive strengths 41 40 MPa, respectively, days. One dominant factors influenced calcium sulfate, CaSO4 (CaO+SO3), PWG V-B5G materials; silicate, CaSiO3 (CaO+SiO2), GGBS; pozzolanic activity (SiO2+Fe2O3+Al2O3) RAF. results suggest most mixes groups suitable use as (base) foundation