The report studies the long-term performance of tarbound road bases in four of the Road Research Laboratory's full-scale road experiments at Boroughbridge (1950), Sapcote Junction (1951), Alconbury Hill (1957) and Tamworth (1960). The criterion of performance used is the amount of permanent deformation in the nearside wheel-path, and the age of each experiment is expressed in cumulative standard (8,000 kg, 18,000 lb) axles passing along the slow lane of the road since the opening of the experiment. The range of tarbound road base materials covered extends from single-size material with 36C e.v.t. tar binder to medium-textured tarmacadam with 50C e.v.t. tar binder. All have now been superseded for heavily trafficked roads by dense tarmacadam road base. (Author)
A Comparison of the Performance of Tarbound Road Bases in Four Full-Scale Road Experiments
1970
32 pages
Report
No indication
English
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