Effect on pavement wear of increased mass limits for heavy vehicles: stage 4

The relative change in chipseal surface texture depth between 8- and 12-tonne single-axle dual-tyred load limits was assessed using accelerated pavement testing at CAPTIF (Canterbury Accelerated Pavement Testing Indoor Facility, Christchurch, New Zealand) in a 4-year research programme carried out between 2000 and 2004. Results showed the ‘Patrick model’, which is used in the current method of chipseal design, could be applied to the measured data. The relative difference in chipseal life between 8- and 12-tonne loads should be calculated using a damage law exponent of 2.0. (a)

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