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EFFECT OF SAMPLE UNIT SIZE AND NUMBER OF SURVEYED DISTRESS TYPES ON PAVEMENT CONDITION INDEX FOR ASPHALT-SURFACED ROADS.
| 题名： | EFFECT OF SAMPLE UNIT SIZE AND NUMBER OF SURVEYED DISTRESS TYPES ON PAVEMENT CONDITION INDEX FOR ASPHALT-SURFACED ROADS. |
| 作者： | Shahin-MY; Stock-C; Crovetti-M; Beckberger-L |
| 关键词： | ASPHALT-PAVEMENTS; PAVEMENT-DISTRESS; CONDITION-SURVEY; SAMPLE-SIZE; TYPES-; PHOTOGRAPHS-; IMAGE-PROCESSING |
| 摘要： | A study was conducted to quantify the effects of altering the sample unit size for performing a distress survey according to the Pavement Condition Index (PCI) method for asphalt surfaced roads. The effect of consolidating distresses into fewer distress types during condition surveys was investigated. The effect of reducing sample unit size was investigated using surface photographs of 24 asphalt-surfaced pavement sections located in Urbana-Champaign, Illinois. Continuous 35-mm strip photographs of each pavement surface were obtained using the PASCO system. The continuous photographs were subdivided into image units, each 3 m (10 ft) long by one lane wide. Standard sample units, each 60 m (200 ft) long by one lane wide, were developed by grouping 20 contiguous images. The PCI of each sample unit was calculated based on observable distresses using Auto PAVER. Pavement image groups were developed by combining varying numbers of contiguous pavement images. The PCI was then calculated for each group using standard deduct curves and PCI calculation methodology. The effect of reducing the number of recorded distresses was investigated using distress data contained in Micro PAVER data bases from several military installations and cities. Comparisons were made between PCI values calculated using standard PCI procedures (19 distress types) and PCI values calculated using modified distress identification procedures developed by the Metropolitan Transportation Commission (7 distress types). |
| 总页数： | Transportation Research Record. 1995. (1508) pp60-71 (5 Fig., 6 Tab., 8 Ref.) |
| 报告类型： | 科技报告 |
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