Shrinkage Factor for Fill Construction : An Engineering Report, January 1969

(1969) Shrinkage Factor for Fill Construction : An Engineering Report, January 1969. Transportation, Department of

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Abstract

In any roadway construction program soil is excavated from one site and placed and compacted at another. The volumes of excavation and fill can be determined within reasonable accuracy from-survey and design data. A certain volume of excavated soil rarely occupies the same volume in the roadway fill. During compaction, effort is made to expel water and air from the soil mass thus reducing its volume and increasing its density. Hence, to obtain the volume of the fill material, the volume of the excavated material is adjusted by a factor commonly known as the "Shrinkage Factor." To determine the values of shrinkage factors, data was collected from the roadway construction projects completed by the Iowa State Highway Commission. Investigation of this data revealed that the shrinkage factor is greatly affected by the type of the soil.