Physico-chemical properties of new clinker-free hydraulic binder from metakaolin, anhydrite II and lime

Abstract

This paper deals with a new clinker-free hydraulic binder (3C), the synthesis of which was inspired by FBC ash with hydraulic properties based on the principle of lime-sulfate activation of metakaolin. The influence of the composition on the fundamental mechanical and chemical properties of the 3C binder was investigated (phase composition changes, compressive strength, porosity, setting time, flow table test and hydration heat) at the same water to binder ratio. The results showed that the 3C binder containing 61 wt.% metakaolin, 19 wt.% anhydrite II and 18 wt.% lime had the best mechanical properties. This binder achieved higher 7 and 28 day compressive strengths than reference Portland cement. The 3C binder appears to be very promising for the construction industry in the future and may become a new ecological substitute for high-emission Portland cement.