The safety of road users is of primary importance for the New Zealand State Road Authority so key drivers for resurfacing are surface friction and texture depth to optimise the surface friction of pavements. Traditionally the repair method for a surface friction-deficient, or texture-deficient surface is the application of a new surfacing layer. There are several techniques for resurfacing these deficient sites that simply recycle the existing surface. These include mechanical retexturing, waterblasting and ultra high-pressure (UHP) watercutting. This paper describes the evolution of the UHP watercutter from its use solely for preseal repairs to its success as a resurfacing technique for microtexture and macrotexture deficient surfaces. Included in the paper are descriptions of laboratory experiments and case studies describing the performance of resurfaced sites more than four years after treatment. The paper explains conditions that affect the performance of texture restoration utilising ultra high-pressure (UHP) watercutting, and concludes that the effectiveness of the UHP watercutting is variable but can be up to five years in some situations. (a) For the covering entry of this conference, please see ITRD abstract no. 0612AR242E.
Samenvatting