Investigation on Recycled Cement Based on Waste Concrete

Adding part of granulated blast furnace slag(GBFS), steel salg(SS), Desulfurization gypsum(DG), we can use Waste Cencrete (WC) as the main raw materials to directly produce uncalcined cement by grinding. With mix proportion 40%similar to 50% of WC and curing in water, the 3d compressive strength of the cement can reach 10MPa.,the 28d compressive strength of the cement can reach 20 similar to 40MPa. XRD and SEM analysis show that, the hydration products of the cement are ettringite and C-S-H gel. Parts of WC involves in the hydration reaction, residual WC is wrapped by the hydration product as aggregate filler.