Abstract
The Marshall design method for bituminous concrete is a popular design method in both highway and airport construction. A serious limitation of this method is its inability to relate the quality of the material to the test values of the design variables. Since the design variables are known to be jointly normally distributed, an overall quality index can be obtained by calculating the cumulative multivariate normal distribution function between the specified limits of the design variables. This will enable engineers to quantify the goodness of a particular mixture by utilizing the means, standard deviations and correlations of the acceptance variables. In comparison, only the means of the acceptance variables are used in the present Marshall approach.
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