The cost implication of using periwinkle shell ash in the partial replacement of cement for rigid pavement construction is presented. Cost optimization model was developed to predict the cost of PSA cement concrete. Regression models relating compressive strength and cost per cubic metre of PSA cement concrete were also developed. Calcined PSA (at 8000C) was used in the preparation of concrete specimens. Design mixes developed using Scheffe’s simplex lattice theory was represented in kilogram per cubic metres with concrete density assumed to be 2400 Kg/m3. Scheffe’s second-degree polynomial was used in the derivation of the cost optimization model and regression analysis was used in the derivation of relationship models using cost estimations from design trial mixes. These mathematical models were subjected to validation test using Fisher’s test with the aid of results from control mixes. The mean absolute percentage error (MAPE) method was adopted in comparing model values and experimental values of PSA cement concrete. From the results of this study, the cost of cement concrete was reduced with introduction of periwinkle shell ash. The average amount saved in using periwinkle shell ash in cement replacement for concrete production was discovered to be ₦1 792.52 per cubic metre. The derived models’ values compared well with experimental values’ as evident from the F-statistics and MAPE studies conducted.
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