ASR expansion behavior of recycled glass fine aggregates in concrete

The alkali–silica-reaction (ASR) expanding behavior of different types of glass, all derived from cullet with different chemical composition, has been investigated. The glass reactivity was determined in different alkaline solutions based on sodium and/or calcium hydroxide to simulate concrete environment. The expansion of mortar containing different amounts of the investigated glass as fine aggregate has been carried out in different conditions: data collected underline a different response of glass towards the alkaline environment. Soda–lime glass shows negligible expansion, lead–silicate glass always generates expanding trends while boro–silicate glass has different behaviors depending on its colour. An attempt to link the behavior to the solubility and chemical reactivity of the glass is proposed.