Release Pendulum TRRL (British Pendulum Friction) to determine the coefficient of slip resistance in path 102.

Following the course Walkways assessment of the AUC, Measuring the skid resistance on asphalt Route 102 was made recently built by company C.V.C. with the British Pendulum CITEVI.

Slip resistance assesses the non-slip characteristics of a pavement surface and is directly related to the micro-texture of the aggregates used. The test consists of measuring the energy loss experienced by a pendulum fitted at its end with a rubber shoe, once it touches the surface to be tested. This loss of energy is registered by a mark on the graduated plate that contains the equipment.

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With respect to the study section, said coefficient was determined in the new and in the old asphalt layer. In both cases, the test gave a value between 60-65, with a high repeatability in the measurement. Sections of the Carrasco Airport and the Interbalnearia were also tested, exhibiting similar values. Magdalena Pastorini and Nicolás Vaz from the MTOP were present to evaluate and discuss the results obtained.

Teachers consulted the University of Rosario, Marta Pagola and Oscar Giovanon, confirmed that the value found is good. They also clarified that the value tends to decrease with the level of traffic, and if it remains, it may be due to a not very good Los Angeles wear value, to the extent that the particles suffer small detachments (recovering their microtexture) when At the same time they tend to be polished. Finally, Marta comments that as an example, the Olavarría granite in the Province of Buenos Aires, has an initial value before polishing of the order of 65, and after polishing of 40. That final value of 40 is reached in 5 , 10 or 15 years depending on traffic and dirt conditions on the road.

As a final observation we conclude that the pendulum is very sensitive to the texture: if the mixture was kneaded, but still with exposed aggregates can give similar values. Therefore, to fully assess the slip resistance, it is advisable to supplement it with the patch of sand.

We must pay attention to these factors as they influence the behavior of the tire with the pavement, especially in wet conditions. Laboratory sion It has the equipment available to evaluate this parameter.