【摘 要】
：
Recycled glass has already been used as concrete fine aggregates or cement substitute.However, its amorphous nature can promote and develop alkali-silica-reaction (ASR).ASR usually occurs when glass i
【机 构】
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Dipartimento di Ingegneria Civile, Ambientale e dei Materiali Università di Bologna,40131 Via Terrac
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
Recycled glass has already been used as concrete fine aggregates or cement substitute.However, its amorphous nature can promote and develop alkali-silica-reaction (ASR).ASR usually occurs when glass is used as sand replacement, whereas when glass is added as cement replacement, pozzolanic reaction takes place and the material behaves as a supplementary cementing material.However, it has been proved that glass chemical composition is a key parameter for the developing of both reactions.For example, the presence of lead oxide as network modifier at high amounts (> 10% wt) favours the occurrence of ASR when the glass is used to partially replace sand or cement.In this work, silicate glass containing a 5.0 wt% of barium oxide coming from décor items and glassware have been studied to test their reactivity as supplementary cementing materials in pastes and mortars: at the same time,we have also investigated the conditions under which potentially deleterious expansive reactions can take place.Moreover, through SEM-EDS analysis, an assessment of the products microstructure has been carried out.
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