TWO-LAYER DRAINAGE ASPHALT - NOISE REDUCTION AND CLOGGING

摘要: An urban test road with 4 pavements was constructed in Copenhagen 1999. One section dense asphalt concrete as a reference. Three sections two-layer drainage asphalt. Maximum 5 or 8 mm chippings the top layer. The total layer thickness 55 mm, 70 and 90 mm. aim is to study performance of over their lifetime. To avoid clogging are cleaned twice year. A comprehensive measurement program has been designed. Yearly measurements noise, pavement characteristics, permeability traffic safety carried out. results from noise on individual vehicles ordinary presented. When new, reduction at thickest asphalt, compared reference section, 6 dB. At two other corresponding Results nine months later indicate some changes. reduced thinnest fine graded by 1 chip pings still same show tendencies clogging. will be intensively December 2000. before after this cleaning presented correlated permeability. (A) For covering abstract see ITRD E113232.