Regression Models for the Prediction of Strength Properties of Waste Tyre Ash (WTA) - Mortar
Abstract
Sustainable development is an emerging political and social issue of global significance, Environmental scientists are generally of the view that Portland cement is not particularly environmentally friendly. Thus, the challenges of producing and using concrete, is aggravated by the high need and consumption of cement which is causing the using concrete, is aggravated by the high need and consumption of cement which is causing the environmental threats as outlined by the environmentalists. The background of this study emanates from this development and forms the basis for conducting the research. Waste Tyre Ash (WTA) is the ash residue that is obtained after slices of waste or scrap tyres are burnt at a temperature of 5000C for a period of 5 hrs. Therefore, the aim of this study is to determine the effect of using WTA as a partial replacement of cement in WTA-Mortar and to develop models for the prediction of strength properties. Cement was partially replaced with WTA at 0%, 5%, 10%, 15%, 20%, 25% and 30% by weight. The findings showed that WTA decelerates setting time of cement and strength development in mortar. Compressive strength and flexural strength of mortar increases with increase in WTA up to 20% and 15% replacement of cement respectively. Strength predictive models for WTA-Mortar have good correlations with experimental data with average of R2 of 0.91, RMSE of 0.57 and COE of 0.66. Statistical models drawn from the results of this research will also provide a means to predict WTA mortar strengths and behavior.
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