Pavement wear from studded tyres is mainly a Nordic problem. Consequently, the development of durable concrete pavements and circular pavement testing machines have mainly been carried out in Norway, Sweden and Finland. The machines and test procedures differ since they have in part been adaptated to the conditions in the countries concerned. In the European committee of Standardisation, CEN, pavement testing machines have been proposed as test equipment when determining the wear resistance of concrete pavements to studded winter tyres. The aim of this ring analysis was to study the relations between three Nordic pavement testing machines and to produce a proposal for a test method. The results were reported as relative SPSp values (specific wear when tested in a pavement testing machine) according to an original proposal for a CEN method. Equivalent results are obtained in the Norwegian and Swedish pavement testing machines. The results of the Finnish pavement testing machine differ slightly from the results of the two other pavement testing machines. Alternatively, the result was reported with the RWI (Relative Wear Index). An evaluation of the result according to the RWI, offers better conformity between machines. Concrete pavements with high compressive strength and porphyry aggregates had the best wearing resistance. Generally, concrete pavements with a maximum aggregate size of 16 mm had better wearing resistance than the corresponding concrete pavements with 8 mm aggregate. Based on this study, an alternative proposal was elaborated to produce a test method for the wear resistance of concrete pavements. This proposal can be used as a basis when producing a revised CEN method. (A)
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