The design, construction and maintenance of a sprayed seal surfacing are important ingredients to its long term performance. However paramount to achieving such performance is the quality of construction of the underlying pavement structure. In Victoria, 85 per cent or over 19,000 kilometres of the declared rural road network which is managed by VicRoads, is surfaced with a sprayed seal on a pavement constructed utilising unbound granular material. In particular, for pavements carrying up to 8000 heavy vehicles per day which is equivalent to 70 million equivalent standard axles (ESAs), excellent performance has been achieved utilising unbound wet mixed crushed rock as the pavement material. However close attention to its manufacture, supply, delivery and compaction in the roadbed to achieve a dense, tight and uniform surface capable of withstanding hard brooming are also important ingredients to the success of the subsequently applied sprayed seal. This paper discusses the essential ingredients necessary to achieve a strong and stable underlying pavement which in turn provides the best opportunity for a successful sprayed seal surfacing. (a) For the covering entry of this conference, please see ITRD abstract no. E217100.
Abstract