Table of Contents
Journal of Waste Management
Volume 2014 (2014), Article ID 517219, 14 pages
http://dx.doi.org/10.1155/2014/517219
Research Article

Response Surfaces for Fresh and Hardened Properties of Concrete with E-Waste (HIPS)

Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu 620015, India

Received 17 July 2014; Accepted 10 September 2014; Published 25 September 2014

Academic Editor: Milva Pepi

Copyright © 2014 K. Senthil Kumar and K. Baskar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The fresh and hardened properties of concrete with E-waste plastic, that is, high impact polystyrene (HIPS), as a partial replacement for coarse aggregate were analyzed using response surface methodology (RSM). Face-centred central composite response surface design was used in this study. The statistical models were developed between the factors (HIPS and water cement ratio) and their response variables (slump, fresh density, dry density, compressive strength, spilt tensile strength, and flexural strength). The Design-Expert 9.0.3 software package was used to analyze the experimental values. The relationships were established and final mathematical models in terms of coded factors from predicted responses were developed. The effects of factors on properties for all variables were seen visually from the response surface and contour plot. Validation of experiments has shown that the experimental value closely agreed with the predicted value, which validates the calculated response surface models with desirability = 1. The HIPS replacement influenced all the properties of concrete than water cement ratio. Even though all properties show the decline trend, the experimented values and predicted values give a hope that the E-waste plastic (HIPS) can be used as coarse aggregate up to certain percentage of replacement in concrete which successively reduces the hazardous solid waste problem and conserves the natural resources from exhaustion.