Abstract
Using recycled glass in concrete applications decreases the amount of glass in landfills and substitutes for expensive aggregates in the concrete mix. However, there has been a concern on recycled glass with smooth surfaces that would result in a drop in strength and in particular a reduction of an already low ductility. Thus, in many design aspects, the use of recycled glass in concrete is limited up to 30% by weight due to concern on concrete strength reduction. The current manufacturing technology in the recycling glass has been grown and evolved through which recycled glass has been processed to exhibit the following features: basically zero water absorption, excellent hardness (great abrasion resistance), high durability to resist extreme weather conditions, etc. The paper challenges the currently used recycled glass mixtures and presents new mix design principles for concrete mixed with 10%, 20%, 30%, 50%, and 100% recycled glass as replacements of nature sand and Portland cement to assess (1) strength changes and (2) resistance to alkali silica reaction (ASR). Aggregate, water reducer, hydration stabilizer, mid-range water reducer, fiber, and viscosity modifier were prepared with varying dosages of recycled glass. A series of scanning electron microscope (SEM) imaging were performed to evaluate the resistance of recycled glass specimens to ASR. The paper concludes that the use of recycled glass as an alternative aggregate and cement binder in the concrete mixtures show promising performance in both tensile splitting strength and ASR.
Highlights
Conventional or typical concrete is designed to have a high compression strength that can be applied to a diverse spectrum of real world projects
In comparison with the specimens containing less than 50% recycled glass (RG) replacement, the specimens containing more than 50% RG replacement matrix (MD# 1.7-MD# 1.9) have better splitting strength
In the design mixes that contain less than 50% RG replacement, MD# 1.4 with a 20% RG as a cement binder replacement has the least tension strength tested at 28 days
Summary
Conventional or typical concrete is designed to have a high compression strength that can be applied to a diverse spectrum of real world projects. Using recycled materials for replacement of nature aggregates would substantially lessen the disruption of the environment. One of methods is to use alternative materials to replace manmade Portland cement such as recycled glass. Pulverized post-consumer glass is eco-friendly alternative to be considered in concrete, to replace the Portland cement, natural sand and gravel aggregate. In many design aspects, the use of recycled glass in concrete is limited up to 30% by weight due to concern on concrete strength reduction [4]. The purposes of this paper is to present a list of concrete mixtures using recycled glass as an alternative aggregate and cement binder and evaluate the effectiveness of recycled concrete mixtures in the performance of strength and resistance to alkali-silica reaction
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