Appendix B - Site details

Site no.

Scheme ref

Location/ Survey action

Description/Scheme design notes

18

18/SW/0103/034

· Walk-over, check current status

A77 - South of Kirkoswald

Road Type: D2; length 846m; completed in October 2019.

This scheme was supplied by the OC, highlighting a large pothole with cracking in the vicinity and water within the hole. The description and location appear to correspond with the defect at chainage 217 found as part of this investigation. The treatment, from analysis of the VCS and cores appears to be reasonable, but there is no client review within IRIS to ascertain any concerns or conflicts arising from the review process. 

20

17/SW/0103/005

· Walk-over, check current status

A77 – Drumellan Farm. 

Road Type: S2; length 1200 m; completed in May 2017. 

93 defects on this scheme have been well documented with further coring and laboratory testing to ascertain the route problem. The treatment proposed by the OC appears to have been reasonable, with a 40mm inlay implemented through the majority of the scheme with targeted 200m inlays dictated by the VCS and core reports. IR highlighted issues with the existing binder course, possibly suffering from moisture ingress when exposed following planing operations. The presence of clay was found in the binder course. Construction failures were restricted to sections that had received a 40mm inlay. 

19

19/SW/0103/035

· Drive-over, check current status

· Closer inspection to be carried out at Laybys (one located at beginning of job)

· Defects/repairs located near overbridge

A77 (SB) - South of Kilmarnock. 

Road Type: D2; length 2135 m; completed in September 2019.

Scheme supplied by OC. Eleven defects include potholes, fretting and chip loss. Street View (Sept 2020) shows variation in surface texture between CL1 & CL2 with the former looking very open compared to CL2. Scheme includes 40 mm to 220 mm structural inlays.

17

19/SW/0103/015

· Walk-over, check current status

· Footway available for length of scheme

A737 - adjacent to Beith

Road Type: S2; length 868m; completed in July 2019.

Scheme supplied by the OC, noting that they had identified a defect at chainage 286 on CL1 in November 2019. There is a possibility that the defect at chainage 780 is outside the scheme extents. There is no obvious reason for the occurrence of these defects, however it is noted that several treatment depths were reduced from 200mm to 100mm during the review process. There has also been 2 further defects identified (both potholes, at ch.137 & 283).

22

19/SW/0103/010

· Drive over to check status.

· Street View (Oct 2020) shows pothole on bridge deck and defect (small pothole) in vicintity of traffic loop.

M80 (SB) - North of Glasgow, nr. Stepps.

Road Type: D2H; length 832m; completed in September 2018.

Eight defects found within the extents, although 2 of the defects described as NB, so may be outside the scheme. The OC had originally proposed a 150mm inlay to CL1, based on the defects present in the VCS and core report, which showed top-down cracking and debonding at 125mm – 145mm in depth. This depth of treatment was questioned during the review process as the crack depths were generally limited to 45mm. The OC conceded that the cracking did not propagate to the proposed treatment depth, but highlighted de-bonding at the binder/base interface. TS questioned whether this treatment would give VfM, and the treatment was reduced to a 50mm inlay only. 

21*

18/SW/0103/002

· *Not surveyed owing to Covid restrictions.

A75 - Kirkcowan and Newton Stewart Rd.

Road type: D2; 1530 m; completed in March 2018.

This scheme consisted of targeted inlays to the most deteriorated areas. The review from TS remarked that this was an appropriate solution given the pavements variable condition. Eight of the 11 defects previously identified were found to be outside the resurfaced section. The remaining 3 defects (all fretting) are just within the extents giving the possibility that there are no early life defects within this scheme.

Site no.

Scheme ref

Location/ Survey action

Description/scheme design notes

14

19/SE/0103/025

· Drive over to check there are no defects

· Appears to be a referencing issue with defects.

· Eyeball aggregate size.

A1(SB) - approx. 2.5 miles E of Musselburgh

Road Type: D2; length 1280 m; completed in Nov 2018

The six defects recorded as part of this work do not appear to tie in with the information supplied by the OC. This may simply be reporting errors by the inspection team. Some of the deeper treatments consisted of ½ lane inlays, with some concerns regarding the location of construction joints below the wheel tracks. Original design specified a 14mm TS2010. However, according to the MSD, a 10mm TS2010 surface was laid on site.

12

20/SE/0103/23

· Drive over to check status.

· Isolated defects clearly visible on Street View (Sep 2020).

A1 (NB) – nr. Macmerry

Road Type: D2; length 1509 m; completed in August 2019. 

One defect/small area identified within the scheme extents. Since the initial search in July 2020, there has been a further defect recorded in November 2020 at chainage 1337 – described as 2 potholing patch repairs of 8m x 1m and 4m x 1m in size. 

13

18/SE/0103/049

· Walk-over, check current status

· Check to see if deeper constructed section is free of defects. [NB. Approx. Ch 70 to 220m from the northern side of the scheme]

A1 - Nr. Houndwood

Road Type: S2; length 1,069 m; completed in April 2018.

Fifteen defects recorded. An inlay of 25 mm thick, 6 mm TS2010 was carried out. In addition, 150 m length of a deeper 100mm localised inlay of 25mm surface course and 75 mm AC20 was used in CL1 only. The OC had proposed a further 100mm inlay in CR1 over the same section length but this was removed from the design. A report on the failures was compiled by the OC. There have also been another five Cat 1 defects repaired since the initial search in July 2020. 

15

17/SE/0103/020

· Walk-over, check current status

A7 - Ettrick Terrace, Selkirk

Road Type: 2-lane urban single carriageway; length 1,300 m; completed in November 2017.

Five defects recorded were listed as cracking, patch reinstatements and fretting. TS2010 was initially proposed as the replacement surface course, but during the review process concerns were raised around density of iron work and HRA was used. High levels PAH detected in a significant number of cores which were mostly avoided in the design. The new defects have occurred at locations where previous reinstatements were noted on the VCS and near manholes. Since initial search in July 2020, there has been a further 4 defects recorded.

11

19/SE/0103/009

· Walk-over, check current status

A702 - Broughton Road, Biggar 

Road Type: 2-lane urban single carriageway; length 663m; completed May 2019. 

Only one Cat 1 pothole identified and repaired in Nov 2019. Additional pothole identified in January 2020. SOI review raised the depth of treatment near failing utility reinstatements. However, the location of both identified potholes does not appear to be in the vicinity of any previous utility trenches although according to the VCS, the most recent defect does appear to be in area that had rutting and reinstatements in the OS wheel track of CL1.

16

19/SE/0103/028

· Drive over to check status.

· Faults within bridge deck?

M80 (SB) - between Jct 8 and 7, S of Denny

Road Type: 3-lane with H/S; length 1176m; completed in Mar 2019

Four pothole defects identified within the scheme. Possible that most defects are located on bridge deck – excluded from treatment (825 and 875). Main driver for maintenance was fretting of the existing surface course with potholing. All of the 40 extracted cores seemed to be in good condition with no structural defects.

Site no.

Scheme ref

Location/ Survey action

Description/Scheme design notes

1

17/NE/0103/031

· Drive-over, check current status

M90 (NB) - Jct 4 & West of Kelty. 

Road Type: D2: length 1115 m; completed in November 2016.

7 defects recorded. The maintenance driver was cracking along the hard shoulder, open joints and fretting. The OC proposed a 120mm inlay including a reinforcement grid in CL1. All of the defects recorded since resurfacing occurred within a 40-metre section of CL1 or the left edge of the C/way. There is a possibility that the fretting defects noted from chainage 128 onwards could be outside the scheme extents and are not early life defects. 

3

17/NE/0103/015

· Drive-over, check current status

· Starts from job above and finishes just beyond bridge deck.

M90 - Jct 4 to 5 N of Cowdenbeath. 

Road Type: D2H; length 1,000 m; completed in November 2018 

All four defects happened from chainage 967 to 974, prior to the bridge deck (ch.988-1018). There are some inconsistencies at this location as the MSD indicates that the bridge deck was resurfaced along with the remainder of the site. However, images from Google earth (October 2020) show that perhaps the deck was not resurfaced and that the defect chainage may be inaccurate and the defects occurred on the bridge deck.

5

17/NE/0103/016

· Drive-over, check current status

· Closer inspection to be carried out at Layby (one located near beginning of job)

· Is deterioration within shallower inlay?

A9 (SB) - NE of Dunblane

Road Type: D2; length 1,040 m; completed in April 2017.

20 defects reported and main maintenance driver was fretting and potholes. The treatment consisted of 40 & 60mm targeted Inlays. Eighteen of the 20 defects since resurfacing occurred within a 51m section of CL1 (Ch 1318 to 1369). Nearest core (1 of 14) to this area (Ch 1381) was recorded as broken to a depth of 95mm. The remaining 13 cores were all in relatively sound condition.

6

17/NE/0103/018

· Walk-over, check current status of remedial repairs

· Parking at start of job

A9 (NB) - Sherrifsmuir to Blackford

Road Type: D2; length 840 m; completed in April 2017. 

10 defects recorded. Maintenance driver for this scheme was fretting. PI found no structural issues. OC had proposed a surface course replacement and not disputed during the review process. All defects recorded since resurfacing occurred on a 17 m section of CL1 (Ch 1520 to 1537). Further core investigation (October 2017) revealed that the binder layer had deteriorated, and was attributed to the presence of clay in binder that broke down during planing operations. A remedial intervention replaced both the surface course and binder course. Street view (2019) show no defects in remedials.

2*

18/NE/0103/004

· *Not inspected owing to Covid restrictions.

· Street View (Nov 2020) shows repairs to road edge that are not though to relate to reinstatement, i.e. damage due to vehicle over-run.

A95 - Ballindalloch

Road Type: S2; length 1375 m; completed in July 2018.

8 defects recorded. Maintenance driver was to include repair of longitudinal reinstatement. Images from VCS (2017) show cracking, crazing and rutting in the vicinity of this reinstatement. The 8 defects recorded since resurfacing occurred within two 16 m sections (Ch 636 to 652) and 100 m section from (Ch 965 to 1065). If the chainage of the defects is accurate then there is the possibility that they have happened where the treatment depth was limited to 45mm of TS2010. There is also a possibility that the Gas line restricted the pavement investigation, although this is not mentioned in the SOI or review process. There has also been a further 11 defects recorded at this location since the initial search in July 2020. NB Initial SoI states section of A95 is an evolved road with limited drainage. 

4*

19/NE/0103/046

· *Not surveyed owing to Covid restrictions.

A96 - Forres to Elgin, adjacent to the Kinloss military base junction.

Road Type: S2; length 248 m; completed in September 2019.

2 defects recorded. Treatment consisted of 150mm, with the exception of the turning lane, that received a 45mm Inlay of TS2010. Two areas of fretting reported in March 20.

Site no.

Scheme ref

Location/ Survey action

Description/Scheme design notes

7

18/NW/0102/006

· Footway available for part of the scheme.

A887 - west of Invermoriston 

Road Type: S2; 1732 m; completed May 2018. 

37 defects recorded. The MSD form details show that a combination of 6mm Cl942 and 0/10 mm TS2010 was laid at the site. The 6mm Cl942 from ch.0-194 was implemented in February 2018 while the remainder of the site was resurfaced with TS2010 (10mm) in May 2018. There is no obvious reason for the fretting defects found on this site 

8

18/NW/0103/095

· Not surveyed owing to Covid restrictions.

· Drive-over, check current status closer inspection to be carried out from side roads

A82 - south of Spean Bridge

Road Type: S2; length 1,457 m; completed in September 2018. 

2 defects recorded. The treatment consisted of a 150 mm inlay: 50mm AC20 Dense Binder course was laid on planed surface followed by a pavement reinforcement geogrid with a further 60 mm of AC20 Dense Binder course and a 40mm Cl942 10m surfacing. From the SOI review process, this treatment was devised to address a deteriorated composite pavement construction. The VCS indicated the presence of transverse cracking, edge cracking, potholes, fretting and crazing. The TS review noted that edge cracking might be a result of a different construction at the edges.

11

16/NW/0103/038

· Park at Loch Tulla viewpoint & walk down

· Visited during SIP19 (edge defects?)

A82 - North of Bridge of Orchy 

Road Type: S2; 881m; completed in May 2017.

5 defects recorded. The OC had originally proposed an inlay consisting of 80 mm binder and 40mm Cl942. Altered during the review process to an overlay due to concerns about the lower layers and leaving them in place. All 10 cores showed disintegration or were broken in the lower layers. Design was changed to an inlay/overlay 70; planing depth of 50mm and overlaying 80mm AC20 and 40mm Cl942 (10mm). There were 5 defects found within the extents, one of the defects was described as “Failed resurfacing” by the inspector. 

10

16/NW/0103/044

· Drive over to check current status

· Various side road for closer inspection.

A830 T- Loch Beag to Loch Ailort 

Road Type: S2; 3,280 m; completed in August 2016. 

40 defects recorded. The treatment consisted of a mix of 40mm and 100mm targeted patches over a 3km stretch of the A830. Defects listed include cracking, fretting and potholes, although due to the nature of the scheme and allowing for discrepancies in defect position reporting, there is some difficulty in determining the exact number of defects - 40 originally identified, reduced to 25 after further review. There were no issues noted during the review process. 

9

17/NW/0103/133

· Drive over to check current status

A82 - Tarbet and Inveruglas

Road Type: S2; length 1,635 m; completed in September 2018. 

60 defects recorded. Treatment consisted of 40 6 mm Cl942 & 70mm of AC20 Binder. There is limited scope to make any conclusions on this section: missing several documents, including the TS review, VCS and Core report. However, using the MSD construction information and IRIS chainage locations of the defects, it can be seen that 49 of the 60 defects have occurred out with the sections that received a deeper treatment. It was also noted on the SOI that drainage had historically been an issue at this location.

12*

16/NW/0103/003

· *Not surveyed owing to Covid restrictions.

A83 - Lochgair / Loch Fyne. 

Road Type: urban S2; length 1,073m; completed in January 2017.

16 defects recorded. The initial treatment proposed by the OC was 60mm of EME2 Binder and 40mm of 14 mm Cl942. The design was amended during the review process with the client proposing a 10mm Cl942 and AC20 Binder due to compaction concerns regarding EME2. The defects found as part of the Early Life Failure investigations include edge cracking, fretting, depressions and potholes. There is no obvious reason for the fretting defects found on this site