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BRC Road Condition Assessment Manual

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BRC Road Condition Assessment Manual ROAD CONDITION ASSESSMENT RATING MANUAL TABLE OF CONTENTS 1. PURPOSE ............................................................................................................................................................................... 2 2. DETERMINING SEVERITY ...................................................................................................................................................... 2 3. CALCULATING EXTENT........................................................................................................................................................... 2 4. SEALED ROAD DEFECTS ......................................................................................................................................................... 3 4.1. SEALED ROAD SURFACE TYPE ...........................................................................................................................................................3 4.2. CARRIAGEWAY CODE ......................................................................................................................................................................3 4.3. CROCODILE CRACKING (F ATIGUE ) .....................................................................................................................................................1 4.4. ENVIRONMENTAL CRACKING (B LOCK / DIAGONAL / LONGITUDINAL / TRANSVERSE )........................................................................................3 4.5. SURFACE TEXTURE ........................................................................................................................................................................5 4.6. LOCAL SURFACE DEFECTS ................................................................................................................................................................7 4.7. ASPHALT RAVELLING ......................................................................................................................................................................9 4.8. PAVEMENT DEFECTS ....................................................................................................................................................................10 4.9. RUTTING ...................................................................................................................................................................................12 4.10. PAVEMENT PATCHES .................................................................................................................................................................14 5. KERB DEFECTS..................................................................................................................................................................... 16 5.1. EXAMPLE – KERB & CHANNEL .........................................................................................................................................................17 6. RIGID ROAD DEFECTS ......................................................................................................................................................... 18 5. UNSEALED ROAD DEFECTS .................................................................................................................................................. 22 5.1. UNSEALED ROAD TYPE .................................................................................................................................................................22 5.2. UNSEALED ROAD SURFACE ............................................................................................................................................................22 5.3. GRAVEL DEPTH ...........................................................................................................................................................................23 5.4. SHAPE LOSS ..............................................................................................................................................................................24 5.5. CROSS SECTION .........................................................................................................................................................................25 6. FOOTPATH DEFECTS ............................................................................................................................................................ 26 6.1. EXAMPLE – CONCRETE OR ASPHALT FOOTPATH ...................................................................................................................................27 Prepared by ACEAM Pty Ltd Page 1 of 31 1. PURPOSE The purpose of this manual is give assistance to staff and contractors assessing the condition of roads throughout the Bundaberg Regional Council. The definitions and examples given provide a basis for a uniform and consistent approach to condition rating a road. Road condition assessment enables the Shire to determine the overall condition of its road network as well as identify those road assets that require repair or renewal in future years. 2. DETERMINING SEVERITY Severity is an indicator of how bad the defect is. Any one segment may have defects at a number of severity levels. The severity level that is chosen is the one that is most predominant across the segment. 3. CALCULATING EXTENT For the purpose of field data collection, the raw measured data will be recorded against each road segment for each of the condition distresses. After field data collection is completed, this area (in square metres) is then compared to the total area for the segment. This yields the percentage extent of the road area that is affected by each defect. Subsequently a score of 0 to 5 can be applied to each road segment and for each condition distress. Examples have been provided in this road data condition assessment manual. Prepared by ACEAM Pty Ltd Page 2 of 31 4. SEALED ROAD DEFECTS 4.1. Sealed Road Surface Type Surface Type Code Asphalt AC Sprayed Seal SS 4.2. Carriageway Code Road Function Code Undivided or divided road A Divided road + Direction (In direction of Segment Travel) B Divided road – Direction (In opposite direction of Segment Travel) C Carparks P Service Roads Q Roundabouts R Prepared by ACEAM Pty Ltd Page 3 of 31 4.3. Crocodile Cracking (Fatigue) Measurement: Area Units: square metres (m 2) Severity Low Severity Moderate Severity Extreme SEVERITY LEVEL DESCRIPTION Slight Average Crack Width < 2mm Medium Average Crack Width Between 2mm and 5mm Extreme Average Crack Width > 5mm EXTENT LEVEL DEGREE AREA AFFECTED 0 Nil No Defect Present 1 Negligible Evident <2% Of Total Area 2 Minor Evident Between 2% To <5% Of Total Area 3 Moderate Evident Between 5% To <15% Of Total Area 4 Extensive Evident Between 15% To <50% Of Total Area 5 Extreme Evident >50% Of Total Area Prepared by ACEAM Pty Ltd Page 1 of 31 Example Total area affected of crocodile cracking for segment = 2.5m x 2.5m + 0.5m x 0.5m + (5m x 3m x 2) = 36.5m² Road segment area = 100 x 6 = 600 m² Extent of segment area affected = (36.5 / 600) x 100 = 6.1% Looking at the Crocodile Extent Table , 6.1% falls into rating 3 for this segment Now apply the most predominant severity level identified Slight Medium Extreme Prepared by ACEAM Pty Ltd Page 2 of 31 4.4. Environmental Cracking (Block / Diagonal / Longitudinal / Transverse) Measurement: Area Units: square metres (m 2) Severity Low Severity Moderate Severity Extreme SEVERITY LEVEL DESCRIPTION Slight Average Crack Width < 2mm Medium Average Crack Width Between 2mm And 5mm Extreme Average Crack Width > 5mm EXTENT LEVEL DEGREE AREA AFFECTED 0 Nil No Defect Present 1 Negligible Evident <2% Of Total Area 2 Minor Evident Between 2% To <5% Of Total Area 3 Moderate Evident Between 5% To <15% Of Total Area 4 Extensive Evident Between 15% To <50% Of Total Area 5 Extreme Evident >50% Of Total Area Prepared by ACEAM Pty Ltd Page 3 of 31 Example Total length of cracking for segment = 37m Now multiply total cracking length by 0.25m; 37 x 0.25 = 9.25m² of road segment area affected + add any areas of cracking such as above (2x2) Total = 13.25m² Road segment area = 100 x 6 = 600 m² Extent of segment area affected = (13.25 / 600) x 100 = 2.2% Looking at the Linear Extent Table , 2.2% falls into rating 2 for this segment Now apply the most predominant severity level identified in rated segment Slight Medium Extreme Prepared by ACEAM Pty Ltd Page 4 of 31 4.5. Surface Texture Measurement: Area Units: square metres (m 2) Stripping Flushing Bleeding EXTENT LEVEL DEGREE AREA AFFECTED 0 Nil No defects 1 Negligible <2% Of Total Area 2 Minor Evident Between 2% To <5% Of Total Area 3 Moderate Evident Between 5% To <15% Of Total Area 4 Extensive Evident Between 15% To <50% Of Total Area 5 Extreme Evident >50% Of Total Area Prepared by ACEAM Pty Ltd Page 5 of 31 Example Total the area of, flushing, bleeding and/or stripping defects for the road segment For the example above, this would therefore be = 1.5 x 2 + 3 x 3 + 1.5 x 2 + 3 x 3 = 24 m² Road segment area = 100 x 6 = 600 m² Extent of segment area affected = (24 / 600) x 100 = 4% Looking at the Surface Texture extent Table, 4% falls into rating 2 for this segment. Prepared by ACEAM Pty Ltd Page 6 of 31 4.6. Local Surface Defects Measurement: Area Units: square metres (m 2) Filled & Unfilled Potholes Filled & Unfilled Delaminations EXTENT LEVEL DEGREE AREA AFFECTED 0 Nil No defects 1 Negligible <2% Of Total Area 2 Minor Evident Between 2% To <5% Of
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