Recycled Aggregate Concrete with Fluorescent Waste Glass and Coal/Wood Ash Concrete Wastes

Patricija Kara,Aleksandrs Korjakins

doi:10.5755/j01.sace.1.1.2615

Abstract

Consumption of natural aggregate as the largest concrete component is constantly and rapidly increasing with the increase in the production and utilization of concrete. Recycled aggregate is a valuable resource as replacement for virgin aggregate in concrete. In present study is investigated the approach of optimized utilization of concrete aggregate wastes (CAW) in concrete. The produced concrete cube specimens with fluorescent waste glass powder/suspension and fly/wood ash after determination of their mechanical properties are recycled and used as partial replacement of natural aggregates in recycled aggregate concrete (RAC). Therefore, it helps to convert waste product with determined properties into recourse and potentially to reduce the amount of waste disposed and preserve natural resources. The mechanical properties of recycled aggregate concrete are discussed from the point of the potential of its utilization in structural concrete. DOI: http://dx.doi.org/10.5755/j01.sace.1.1.2615

Highlights

Concrete as a primary building construction material is the most consumed man-made material in the world
According to data in 2008, about 300 million tons of construction and demolition (C&D) waste were generated in the U.S each year and about 50% of this waste was recovered for recycling and the rest was landfilled (Damtoft 2008)
An experimental study was carried out to investigate the effects on the mechanical properties of concrete with concrete aggregate wastes (CAW) obtained from crushed concrete specimens (from previous studies with cement substitution at level of 30% with waste borosilicate (DRL) glass chippings obtained from fluorescent lamps and ground into powder with specific surface area of 2310 cm2/g and coal/wood ashes (Kara, 2012)) after they have been stored as concrete waste

Summary

Introduction

Concrete as a primary building construction material is the most consumed man-made material in the world. In 2007 the world concrete consumption was 11 billion tons or approximately 11.7 ton for each living human being (Mehta 2006, Naik 2005, Naik 2008). According to Mehta (2006), the global concrete industry consumes about 10 billion tons of sand and rocks and taking into account today’s industry development this number is even higher. Concrete being as a primary material in construction industry is one of the most consuming landfills waste materials. Engineers and public authorities are looking for ways of making reuse of C&D waste and, there is important concern to find optimal approach of production of concrete with preferably reduced cement volume and equal/improved properties in comparison to conventional concrete, concrete waste utilization and its recycling. According to data in 2008, about 300 million tons of C&D waste were generated in the U.S each year and about 50% of this waste was recovered for recycling and the rest was landfilled (Damtoft 2008)

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Conclusion