THREE INSTRUMENTS FOR THE MEASUREMENT OF PAVEMENT SKID RESISTANCE

THE EQUIPMENT AND PROCEDURES EMPLOYED BY THE PORTLAND CEMENT ASSOCIATION FOR STUDYING THE SKID RESISTANCE AND WEAR OF CONCRETE IN PAVEMENT AND LABORATORY TESTS ARE DESCRIBED BRIEFLY. THE LABORATORY ROTATING WHEEL HAS PROVED USEFUL FOR THE SELECTION OF MATERIALS SUITABLE FOR NEW CONSTRUCTION AND FOR UPGRADING WORN SURFACES. THE SKID TRAILER IS A RELIABLE DEVICE FOR PROOF-TESTING THE DESIGNS RECOMMENDED AS A RESULT OF LABORATORY TESTS AND FOR DETERMINING WHETHER A PAVEMENT SURFACE HAS WITHSTOOD WEAR AND CONTINUES TO BE SKID RESISTANT. THE PORTABLE PENDULUM IS A CONVENIENT TOOL FOR EVALUATION OF SURFACE CONDITION AND IS USEFUL FOR APPLICATIONS WHERE TIME AND EXPENSE ARE PRIME CONSIDERATIONS. THE INSTRUMENTS COMPLEMENT EACH OTHER AND FORM AN ADEQUATE TRIO WHICH SHOULD HELP TO ELIMINATE UNSAFE PAVEMENTS IN THE FUTURE. /AUTHOR/