IMPLEMENTATION OF CRACK AND SEAT FOR CONCRETE PAVEMENT MAINTENANCE

摘要

The initial research in the UK on the performance of the crack and seat process in inhibiting reflection cracking in asphalt overlays on jointed unreinforced concrete pavements and on pavements with cement-bound roadbases was reported by Potter and Mercer in the 3rd RILEM conference. Since then, 3 more years of monitoring the condition of the trials has confirmed the good performance of the treatment. TRL has developed an analytical structural design method for determining the thickness of asphalt overlay required on cracked and seated jointed unreinforced concrete pavements to carry the anticipated future traffic. Designs have been produced for use on UK motorways and trunk roads carrying cumulative traffic levels up to 100 million standard 8.2 tonne axles. This paper presents the performance of the research trials that has led to the development of the UK crack and seat specification. The on site monitoring and analysis necessary for the successful application of the technique is also described. It also demonstrates how, with effective partnering, validated research results can be implemented quickly for the benefit of the whole community. The analytical structural design method is described and typical design examples are presented.