Over the years, periwinkle shell ash (PSA) has proven to be a reliable option in partial replacement of cement for construction purposes. In this study, mathematical models for predicting the compressive strength and water absorption of calcined PSA cement concrete are formulated for the purpose of Rigid pavement design. The oxide composition of calcined PSA (at 800OC) was determined. The percentage of PSA by weight of cement varied between 5% and 25% in experimental proceedings. The Scheffe’s (5, 2) simplex lattice theory was adopted in formulation of trial and control mixes and also in the development of second-degree polynomial models. All cement concrete specimens produced were subjected to water absorption and 28 days compressive strength test according to standard experimental procedures. The mathematical models developed for both responses using results from trial mixes were subjected to validation test using results from the control mixes. From the F- statistics and R2 statistics conducted, the derived models for the water absorption and compressive strength proved adequate and can be relied upon in the prediction of water absorption and compressive strength of PSA cement concrete for rigid pavement.
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