Abstract
The substitution of river sand with glass aggregate (GA) and cement with glass powder (GP) is a mainstream method to recycle waste glass. Traditionally, standard curing was widely used for glass-based mortars. However, it is time-consuming and cannot address low mechanical strengths of the early-age mortars. Therefore, the effect of water curing at 80 °C on the properties of GA mortars is investigated. Furthermore, the effect of the GP size is also considered. Results show that compared with the expansion of alkali-silica reaction (ASR), water curing at 80 °C has a negligible effect on the volume change. Moreover, the compressive strength of GA mortars under 1-day water curing at 80 °C is comparable with that under 28-day water curing at 20 °C. Therefore, the 1-day water curing at 80 °C is proposed as an accelerated curing method for GA mortars. On the other hand, the addition of GP with the mean size of 28.3 and 47.9 μm can effectively mitigate the ASR expansion of GA mortars. Compared with the size of 28.3 μm, GA mortars containing GP (47.9 μm) always obtain higher compressive strength. In particular, when applying the 1-day water curing at 80 °C, GA mortars containing GP (47.9 μm) can even gain higher strength than those containing fly ash.
Highlights
The amount of produced waste glass has been gradually surging with the increase of glass bottled consumer goods such as beer and wine
For comparing the effects of water curing at 80 ◦ C and alkali curing at 80 ◦ C on the compressive strength of glass aggregate (GA) mortars, the samples with a dimension of 40 × 40 × 40 mm3 were cured under environments similar to those used by the volume stability test
The loss of the compressive strength of GA mortars under water curing at 80 ◦ C can be attributed to the damage of the microstructure derived from the growing and swelling of alkali-silica reaction (ASR) gels
Summary
The amount of produced waste glass has been gradually surging with the increase of glass bottled consumer goods such as beer and wine. Due to the fact that many cities do not have enough glass manufacturing industries, the recycling rate of waste glass is relatively low and a large amount of waste glass is urgent to be recycled. In Hong Kong, about 106 kilotons of waste glass were disposed of at landfills in 2017 [1], while the recycling rate was only 12% [2]. For the purpose of efficiently recycling waste glass and effectively saving river sand, the substitution of river sand with waste glass as fine aggregates in mortars has been widely investigated [5–7]
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