PARTIAL REPLACEMENT OF CRUSHED AGGREGATE BASE COURSE MATERIAL WITH CINDER GRAVEL AND FINE SOIL

construction Technology and Management

Base course, the layer incorporating flexible pavements, is usually built directly under the asphalt-wearing course. The quality of base course materials is essential and is evaluated as per International and local specifications. Contrary to the usage of quality materials for better performance, it is equally important to use locally available and out of specification, materials if adequate performance and project cost reduction could be achieved. The objective of this study was partially replacing crushed aggregate base course materials by cinder gravel and fine soil. In this research study, sample of cinder gravel from location around Wolaita Sodo, was blended with fine soil and crushed aggregate for the base course layer. The laboratory experiments carried out using AASHTO procedures of testing materials. There were two phases of mix proportions. The first phase of blending was carried out by varying an amount of fine soil as 10%,20%,30% and 40% an optimum amount of fine soil needed to stabilize cinder gravel has been found to have 20% by weight proportion. The second phase of trial proportioning composed of the three blended components was starting from a proportion of crushed aggregate, cinder gravel and fine soil 100%: 0% :0%. An incremental of cinder gravel and fine soil and decrease of crushed aggregate revealed that the CBR value at the proportion 40%: 48%: 12% satisfies the minimum requirement of ERA specification for base course layer.

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