Abstract :
Bangladesh is a developing country and its road network demands an ever-increasing expansion. Roads in Bangladesh are usually constructed of flexible pavement. The type and quality of aggregates are of prime importance on the design strength of the pavement. A laboratory investigation was made to evaluate the effect of the shape of aggregates as manifested by flakiness and elongation indices on the design strength of the bituminous mixes for flexible pavement construction. Test results revealed that both stability and flow values increased with the decrement of flaky and elongated particles for the aggregate matrix. At a temperature of 3000F and when no elongated or flaky particles were used in the mix, the stability value was 340 kN and the flow value was 4.8. When temperature was increased to 3200F, stability also increased by 18.5% but the flow reduced to 4.4. Stability value reached as high as 598 kN when flakiness index was 34% with no elongated particles in the mix.
Keyword :
Flakiness index; Elongation index; Stability; Flow; Strength.