INTRODUCTION Construction of structures is one of the most regular activities in life. It often involves sancrete block heavily both for load bearing or non-load bearing walls. The cost/stability of this operation has been a major issue in the world where cost is a major index. Naturally, the rate of development in an area depends to a large extent on the usability of the raw materials in the process of environmental upgrading of that area as this translates to some fast and easy-cheap-to-find technology derived from innovative and testable ideas for technology growth. In construction concrete is the main material. the cost of its production heavily impacts on construction and what can be done for the desired growth in the development of an area by way of construction of new roads, buildings, dams, water structures and the renovation of these. To produce the concrete several primary components such as cement, sand, gravel with or without admixtures are to be present in varying quantities and qualities. Unfortunately, the occurrence and availability of these components vary very randomly with location and hence the attendant problems of either excessive or scarce quantities of the different materials occurring in different areas. Hence, where the scarcity of one component is acute the cost of the concrete production increases relatively tremendously and such problems suggest the search for and application of the more readily available materials in full or part. This is the principal case of the study of the usability of laterite in place of sand or partial replacement of the sand under careful handling and modeling of predictive importance. This is of cost importance as long as the desired quality of the concrete product is not compromised. Planning is the soul and success of every activity in human endeavour. The target of such planning is the maximization of the desired outcome of the execution of the plan. As agreed by Orie and Osadebe, this calls for minimum investments inputs and minimum outputs. The process involved minimization and maximization is referred to as optimization. In the science of optimization, the desired property or quantity to be optimized is referred to as the objective function. The raw materials or The Concept of Optimization Abstract Keywords: The paper presents the report of an investigation into the model development and optimization of the compressive strength of 55/45 to 70/30 cement/Rice Husk Ash (RHA) in hollow sandcrete block. The low cost and local availability potential of RHA, a pozzolanic material gasps for exploitation. The study applies the Scheffe's optimization approach to obtain a mathematical model of the form f(x ,x ,x x ), where x are proportions of the concrete components, viz: cement, RHA, sand and water. Scheffe's i experimental design techniques are followed to mould various hollow block samples measuring 450mm x 225mm x 150mm and tested for 28 days strength. The task involved experimentation and design, applying the second order polynomial characterization process of the simplex lattice method. The model adequacy is checked using the control factors. Finally, a software is prepared to handle the design computation process to take the desired property of the mix, and generate the optimal mix ratios. Reversibly, any mix ratios can be desired and the attainable strength obtained. Sandcrete, Pseudo-component, Simplex-lattice, optimization, transformation matrix. i1 i2 i3 i4 Modeling and Optimization of Compressive Strength of Hollow Sandcrete Block with Rice Husk Ash Admixture P.N. Onuamah Civil Engineering Department, Enugu State University of Science and Technology, Enugu, Nigeria. Email: mailto:[email protected] Received: December, 2013 Accepted for publication: May, 2014 Journal of Experimental Research June 2014, Vol 2 No 1 Email: www.er-journal.com [email protected] An Official Publications of Enugu State University of Science and Technology ISSN: 2315 - 9650 6
Modeling and Optimization of Compressive Strength of Hollow Sandcrete Block with Rice Husk Ash Admixture
Apr 28, 2023
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