Abstract
Aims:This paper introduces a sustainable way of using Recycled Glass Powder (RGP) as a cement replacement in concrete.Background:In Australia, almost one million tons of glass waste is collected annually for recycling purpose. However, the inconsistency in chemical composition and the presence of impurities make glass recycling process difficult. Besides, the lack of local recycling plants coupled with high transportation costs makes the recycling process expensive.Objective:For the successful use of recycled glass in concrete for industrial applications, it is therefore, important to characterize the physical and chemical properties of recycled glass collected by the local councils. Furthermore, the effects of replacement levels of cement with recycled glass on the strength and durability properties of concrete need to be assessed as well.Methods:Mechanical strength and durability properties of concrete with 10%, 20% and 30% of RGP as a partial cement replacement were tested and compared with typical concrete and fly ash blend concrete. The relative strength test of mortar was conducted to assess the reactivity of glass powder with the cement.Results:RGP concrete showed an improvement in strength over time like fly ash. Using RGP significantly improved the resistance against chloride penetration with increasing glass powder content. Furthermore, RGP also met the relative strength requirement as per Australian Standard requirement to be considered as a supplementary cementitious material.Conclusion:This research showed that the use of RGP as cement replacement is feasible for replacement level up to 10%. The outcome of this research aims to contribute towards sustainable development by reducing the consumption of cement, as well as reduction of glass waste going into landfill.
Highlights
The concrete manufacturing process produces substantial environmental impacts, mainly due to the carbon footprint associated with the cement manufacturing process
Aims: This paper introduces a sustainable way of using Recycled Glass Powder (RGP) as a cement replacement in concrete
RGP met the relative strength requirement as per Australian Standard requirement to be considered as a supplementary cementitious material
Summary
The concrete manufacturing process produces substantial environmental impacts, mainly due to the carbon footprint associated with the cement manufacturing process. The use of waste glass in concrete and mortar has been tried in the past few years to replace coarse aggregate, sand, and cement. Several researchers have studied the use of waste glass with larger than 4.75 mm in size as coarse aggre-gate replacement in concrete since the 1960s. Alkali-Silica Reaction (ASR) is another major issue encountered while using waste glass as a coarse aggregate replacement in concrete. In the presence of moisture, alkali-silica gel produced can absorb moisture from the surroundings and expand inside the micro-cracks on aggregates. ASR expansion was found closely related to the proportion of glass particles in the mixture, for instance, a study by Shayan [20] found that the use of coarse glass aggregate greater than 30% resulted in an increase in ASR even with low alkali cement. The lack of local recycling plants coupled with high transportation costs makes the recycling process expensive
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