Development of Optimized Strength Model of Lateritic Hollow Block With 4% Mound Soil Inclusion
The work is an investigation to develop and optimize a model of the compressive strength of lateritic hollow sandcrete block with mound soil inclusion. The study applies the Scheffe’s optimization approach to obtain a mathematical model of the form f(xi1,xi2,xi3,,xi4), where xi are proportions of the concrete components, viz: cement, mound soil, laterite, and water. Scheffe’s 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 purpose-made software was applied to optimize the design computation process which takes the desired property of the mix, and generates the optimal mix ratios and conversely takes the desired mix ratio to generate the optimal compressive strength.