![]() ![]() A study presented by describes the application of general curve fitting procedure for AASHO Road test, which can be used for linear or non-linear models (least square residuals and minimum absolute residuals). Such combinations are considered as 100% by weight of total aggregate in the mix. The several mineral constituents are to be sized, uniformly graded and combined in such proportions that the resulting blend (job mix formula) meets the grading requirements for the specific layer type under contract. ![]() The asphalt concrete mix for base, binder and wearing courses, is composed basically of aggregate, coarse, medium, and fine in sizes, mineral filler and asphalt cement. ![]() For several months with every day execution of the program, it proved that it is efficient and quick enough to be used in such mix design. Decision can be made by the user, and given to the computer to choose one of the six equations after considering the economic issue. 1 to eq.6) ascended according to the sum of errors squares. The developed program uses parabola fit method to find all possible equations that combines the various material gradations as per the specification requirements, the optimization process will select and print the best six formulas (eq. The parabola fit using least square method was adopted in this paper it cares for job mix formula mathematical equation smoothing. ![]() On the other hand, the maximum size of aggregates (start point of the gradation curve) and the percent filler (end of the gradation curve) are fixed for each type of asphalt concrete mix. The target gradation should be dense, uniform, and should not go for one extreme boundary to another or move along one of the boundaries. This paper presents a computerized method for asphalt concrete job-mix formula design the preparation of overall gradation of aggregates for mix design is considered as an essential step in the design of asphalt concrete mixture. ![]()
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