Abstract
In the execution of the foundation layers and the road base it is necessary to reduce the costs of their construction by using local materials (ballast or crushed stone). In some cases, the physical-mechanical characteristics of the local materials do not satisfy the conditions for dimensioning the road structure. Therefore, to improve these characteristics, they are stabilized with hydraulic binders (fly ash or various mixtures based on lime and cement). By using hydraulic binders, the aim is to obtain a speed in execution, to increase the physico-chemical and mechanical characteristics of the local aggregates and implicitly to reduce the overall costs of the work (Zarojanu, 1976).