Optimal Aggregate Blending For Highway works

Abstract

In many situatioa in highway sub-base, base and surface course construction, thegradation of a single soil does not meet the specification. The problems of material sizevariance led to need to combining two or more aggregate having different gradation toproduce an aggregate blend that meets specific gradation, design, and cost requirements.The design requirements include fineness modulus, plasticity index and specific gravity....etc. The task of this work is to design an economical model for highway aggregate blending.This model beside satisfying specific gradation and design requirements; also achieveminimum cost for aggregate blend. The model representing this task is formulated as LinearGoal Programming problem with multi-objective and different system constraints. Using aspecial computer package Manager, the optimum proportions of aggregates blend thatsatisfy specific gradation, design and cost requirei􀎵ents was obtained. The model consideredin this study demonstrates how to achieve multiple and sometimes conflict inanagerialobjectives. The procedure is very simple and can be applied to any number of aggregates