Optimization of The Green Interlocking Earth Brick Mix Design Using Response Surface Method
Abstract
The utilization of Response Surface Method (RSM) in investigating the engineering properties of green Interlocking Compressed Earth Brick (ICEB) is a promising method compared to the conventional methods because it reduces the time taken and cost to be implemented. RSM is a tool used to develop models based on the input of independent and response variables, to which it predicts the output of the response with high accuracy. Therefore, the objectives of this research are to optimize the mix designs of green ICEB by using RSM and to study the engineering properties of green ICEB. The softwares used in this research are Design Expert Version 11, and Minitab 19 which is used for validation. The independent variables are cement and Spent Bleaching Earth Ash (SBEA), while the compressive strength and water absorption are the response variables. Based on the results, Design Expert Version 11 has the capability of developing a significance mathematical model equation to predict the response variables. The 2-D contour plots and 3-D plots are able to present the engineering properties realistically based on the actual experimental data. According to the RSM, the best mix for green ICEB with SBEA to provide the highest compressive strength is 94.6% cement and 5.4% SBEA, while the lowest water absorption is 90% cement and 10% SBEA.
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