The behaviour of waste glasses from discarded fluorescent lamps (WEEE, waste of electric and electronic equipment) that have been proved extremely reactive in Portland cement composites is evaluated in alkali-activated binders. Metakaolin mixed with sodium hydroxide and sodium silicate is the selected binder. Accelerated test according to ASTM C1260 and longer experiments performed at lower temperature (38°C partially according to ASTM C1293) have been carried out to study the possible reactivity. Moreover, the tests at 80°C have also been performed in calcium hydroxide saturated solution to evaluate the possible effect of calcium ions diffusion in the matrix. In all cases, no clearly expansive gels were formed and consequently the level of expansion is limited.
Alkali-silica reactions in alkali-activated mortars containing reactive WEEE glasses / Saccani Andrea, Manzi Stefania, Alessandra Michelacci, Lancellotti Isabella. - STAMPA. - II:(2022), pp. 259-264. (Intervento presentato al convegno 16th ICAAR Lisboa 2020-2022 –16th International Conference on Alkali-Aggregate Reaction in Concrete tenutosi a Lisboa nel May 2022).
Alkali-silica reactions in alkali-activated mortars containing reactive WEEE glasses
Saccani Andrea
;Manzi Stefania;Alessandra Michelacci;
2022
Abstract
The behaviour of waste glasses from discarded fluorescent lamps (WEEE, waste of electric and electronic equipment) that have been proved extremely reactive in Portland cement composites is evaluated in alkali-activated binders. Metakaolin mixed with sodium hydroxide and sodium silicate is the selected binder. Accelerated test according to ASTM C1260 and longer experiments performed at lower temperature (38°C partially according to ASTM C1293) have been carried out to study the possible reactivity. Moreover, the tests at 80°C have also been performed in calcium hydroxide saturated solution to evaluate the possible effect of calcium ions diffusion in the matrix. In all cases, no clearly expansive gels were formed and consequently the level of expansion is limited.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
