Mechanism of Waste Glass Powder in Concrete and Its ASR Risk

Waste materials are widely used in civil engineering,and waste glass powder can be used as a supplementary cementitious material,which accords with the requirement of sustainable development of building materials. On the basis of a large number of literatures,the feasibility of adding waste glass in concrete is researched.Results show that,as a new potential auxiliary cementitious material,glass powder not only has some special effect on the hydration and hardening of composite cementitious material,but aslo has risk of alkali-silica reaction( ASR). As there is plenty of amorphous silicon dioxide in glass,alkali-aggregate reaction easily takes place,but glass powder can be used as active supplementary cementitious material. Furthermore,we present that waste glass which is grinded into powder can be used as auxiliary cementitious material and discuss the effect of glass powder on the hydration and hardening of composite cementitious material and its ASR risk. Grinding waste glass into powder not only reduces risk of alkali-aggregate reaction,but also promotes fly ash action of glass and improves performances of concrete.