Performance of bitumen treated base (BTB) pavement
conference contributionposted on 06.12.2017, 00:00 by C Scotney, Jerome Egwurube
Two major factors that compromise the integrity of a road pavement are excess moisture and heavy axle traffic. The inundation of recent flooding event on Queensland road infrastructures damaged much of the road network infrastructures. The Department of Transport and Main Roads is currently searching for alternative sustainable pavements for the re-construction of approximately 1,450 kilometers of damaged roads caused by the flooding. The aim of this paper is to present the short term performance monitoring conducted on Trial Bitumen Treated Base (BTB) pavement sections constructed on the Warrego Highway Roma as a possible solution to increasing the integrity of pavement structure. Currently there is no published standard specification for Bitumen Treated Base as a pavement rehabilitation option in Australia. Previous performances of the BTB pavement in the Mackay Regional Council were shown to be better than the original pavements in each of the locations. For the current investigation six trial sections 200m long were constructed with full depth BTB pavement replacement and resurfacing. The BTB pavement structure consisted of 7mm C320 armour coat seal, BTB total layer thickness ranging from 265mm to 330mm and stabilized subgrade. Post construction performance indicators were monitored after a period of 7 days, 3 months and 6 months. two laser profilometer was used to evaluate the surface roughness and the falling weight deflectometer used for the determination of the pavement modulus.