Cost-benefit analysis of concrete mixed with waste ceramic tiles and fly ash

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Document Type

Conference Proceeding

Source Title

Wow Concrete 2017

Publication Date

2017

Abstract

This paper focuses on the cost-benefit analysis of concrete when waste ceramic tiles (WCT) and fly ash (FA) are incorporated as partial replacements to its coarse aggregates and cement, respectively. The percentage replacements of the said materials and their combinations were determined through design of experiments. However, the percentage replacements of WCT and FA were only limited to 0% to 75% and 0% to 50% substitutions, respectively. In terms of the unit-cost analysis of the aggregates, material, labor and equipment costs were all considered. Similarly, the costs of sand and water were neglected since all mixes made use of the same material. On the other hand, compressive strength tests following ASTM C 39 were conducted to obtain the nominal compressive strength of the mixes. The corresponding cost and compressive strength of each mix were correlated and optimized through generating a model using Response Surface Methodology (RSM). Based from the generated model, the optimum mix was found out to be 75% FA and 38.25% WCT. This combination resulted to a 27.7% increase in compressive strength while decreasing the cost of concrete production up to 12.5%.

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Disciplines

Civil Engineering

Keywords

Waste products as building materials—Cost effectiveness; Aggregates (Building materials)—Cost effectiveness

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