Recycling cement bypass dust and granulated blast furnace slag into hydraulic road binder

Abstract

Abstract This paper is aimed at the possibility of recycling the cement bypass dust (BPD) and ground granulated blast furnace slag (GGBS) into a normal hardening hydraulic road binder in accordance with standard EN 13282-2. 10 wt.% addition of BPD as potentially hazardous waste formed during the clinker production by burning alternative fuels was used into cement mixtures. Binder mixtures’ composition was designed according to the recommended sheet of Slovak commercial product (DoroCem). The main constituents of the experimental hydraulic road binder mixture were Portland cement clinker, ground limestone and GGBS. Effect of additional component of BPD on behaviour of fresh mixtures and properties of mortar specimens after 56 days of hardening was studied. The results prove that only one of the tested mixtures (BM2) with the lowest SO3 content and clinker but with the highest amounts of GGBS, ground limestone and alkalis (Na2O + K2O) met the standard requirement for initial setting time for tested fresh mixtures. The higher values of compressive strength found for all hardened specimens are most likely related to the formation of the hydrated and geopolymer products in the binder system. Based on these conclusions, BM2 could be used as hydraulic road binder.