M27 Closure and 60 mile Westbound diversion route

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RichardA35
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Re: M27 Closure and 60 mile Westbound diversion route

Post by RichardA35 » Wed Oct 03, 2018 11:50

mikehindsonevans wrote:
Wed Oct 03, 2018 11:36
Sometimes, a concrete batching plant got it wrong in the past; as usually happens, the lessons were learned and, as has been mentioned here several times, the modern "slump" test on each batch of delivered concrete has significantly raised the confidence amongst civil engineers that the structure will stay up for (closer to) its intended lifespan.

Mike
The slump test is not "modern" it has been used for over 30 years and each load tested before placement as long I have been in the industry.
However it is only a test of workability of fresh concrete not a guide to its ultimate strength or durability. The addition of water on site to "liven up a load" has distorted many a result before the implications of this were realised.

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Re: M27 Closure and 60 mile Westbound diversion route

Post by Richardf » Wed Oct 03, 2018 17:25

Johnathan404 wrote:
Tue Oct 02, 2018 16:14
Another local example is M27 J1. No need at all for that road to be a dual carriageway, but it had to be built so it was decided to build it well.
J1? My understanding is that the DC there predates the motorway. The first (-or last) bit of A31 is also the oldest. I always assumed the section between Cadnam and the M27 roundabout is contemporary with that section and was cut in two by the motorway roundabout when the M27 was built.
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Re: M27 Closure and 60 mile Westbound diversion route

Post by Johnathan404 » Wed Oct 03, 2018 17:39

Richardf wrote:
Wed Oct 03, 2018 17:25
J1? My understanding is that the DC there predates the motorway. The first (-or last) bit of A31 is also the oldest. I always assumed the section between Cadnam and the M27 roundabout is contemporary with that section and was cut in two by the motorway roundabout when the M27 was built.
At least as recent as 1966 the A31 went back to single carriageway east of Castle Malwood Hill and then took a straight line from there to the John Barleycorn pub on Southampton Road. If the road layout was changed between then and the motorway opening, it was changed with the motorway opening in mind.

The top of the M271 is another example of a road which did not need to be built as a dual carriageway but might as well be.
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Re: M27 Closure and 60 mile Westbound diversion route

Post by Richardf » Wed Oct 03, 2018 17:52

Johnathan404 wrote:
Wed Oct 03, 2018 17:39
Richardf wrote:
Wed Oct 03, 2018 17:25
J1? My understanding is that the DC there predates the motorway. The first (-or last) bit of A31 is also the oldest. I always assumed the section between Cadnam and the M27 roundabout is contemporary with that section and was cut in two by the motorway roundabout when the M27 was built.
At least as recent as 1966 the A31 went back to single carriageway east of Castle Malwood Hill and then took a straight line from there to the John Barleycorn pub on Southampton Road. If the road layout was changed between then and the motorway opening, it was changed with the motorway opening in mind.

The top of the M271 is another example of a road which did not need to be built as a dual carriageway but might as well be.
You might well be right. However I thought the Sabrewiki suggested otherwise, I think that's where i got my info from, will have to look again.

Certainly the A31 was dualled with the motorway in mind. I'm sure the Rufus Stone Cadnam section was built early on, with the following section past Stoney Cross westward being the last just before the motorway opened. According to the Wiki at least.
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Re: M27 Closure and 60 mile Westbound diversion route

Post by J6onM27 » Thu Oct 04, 2018 10:11

RichardA35 wrote:
Wed Oct 03, 2018 11:50
mikehindsonevans wrote:
Wed Oct 03, 2018 11:36
Sometimes, a concrete batching plant got it wrong in the past; as usually happens, the lessons were learned and, as has been mentioned here several times, the modern "slump" test on each batch of delivered concrete has significantly raised the confidence amongst civil engineers that the structure will stay up for (closer to) its intended lifespan.

Mike
The slump test is not "modern" it has been used for over 30 years and each load tested before placement as long I have been in the industry.
However it is only a test of workability of fresh concrete not a guide to its ultimate strength or durability. The addition of water on site to "liven up a load" has distorted many a result before the implications of this were realised.
Slump is only to gauge the concrete workability, not every load is tested, often it visually assessed. water/cement ratio determines the level of permeability in the concrete (all concrete absorbs a degree of moisture), but does not stop crack development as this is limited by the steel reinforcement. The concrete standards since the 60's have been significantly updated in these years to take exposure conditions into consideration. Highways structures are now designed to 120 year design life which takes account of w/c ratio and the cover needed to the steel. As most the motorway network structures are now over 50 years old then expect many bridges will be continually monitored and those at a critical stage will have repair/replacement program in place.

De-icing salts attack steel reinforcement in concrete by reducing the passive layer of alkalinity in the cover zone, therefore the dissolved salts within water/moisture will permeate into concrete via it porosity or via crack paths, as the steel corrodes it expand more than 8% of it mass, concrete is weak in tension therefore if pops off and therefore the cycle of corrosion and reduction in tensile strength of the steel begins. Junction 4 of M3 at Camberley is perfect example where cathodic protection is being used to extend the life of the motorway bridge.

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Re: M27 Closure and 60 mile Westbound diversion route

Post by mikehindsonevans » Mon Jan 28, 2019 14:08

Update from HA advises that the March closure has been deferred to "late June" as a result of "ground conditions".
https://highwaysengland.co.uk/projects/ ... nt-scheme/

Quote:
Unfortunately, the bridge installation weekend closure has had to be changed. This alteration in the programme is due to unforeseen ground conditions. The next weekend closure of the M27 will now occur at the end of June - please check the Roadworks tab below for full details nearer to the time. Unlike the first closure, the A3057 (Romsey Road) will remain open to vehicles and pedestrian traffic.
end-quote:

Mid-summer fun and games on the M27 diversion routes then??
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Re: M27 Closure and 60 mile Westbound diversion route

Post by Johnathan404 » Tue Jan 29, 2019 00:33

What that press release doesn't tell you is that the announcement comes after contractors told residents weeks ago (probably through Chinese whispers), and when residents contacted Highways England for confirmation their spokesperson said it was news to them.

All big companies have problems with front line staff leaking news before it has been distributed internally, but Highways England do seem to be especially slow at getting the word around.
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Re: M27 Closure and 60 mile Westbound diversion route

Post by Euan » Tue Jan 29, 2019 08:37

The 29-30 June weekend sounds like the most likely candidate for an "end of June" weekend closure, unless it were to be delayed till July which would be even worse given that more and more people will be on holiday by that point. That said, 22-23 June may end up being the closure weekend instead.
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Re: M27 Closure and 60 mile Westbound diversion route

Post by Johnathan404 » Mon Feb 04, 2019 11:36

Osborne appear to think they've directed a short movie on Instagram.
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Re: M27 Closure and 60 mile Westbound diversion route

Post by Richardf » Mon Jun 10, 2019 20:38

Next closure looks set for later this month. I am assuming this is to install the new bridge deck as the supporting piers appear to now be in place.
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Re: M27 Closure and 60 mile Westbound diversion route

Post by SteveA30 » Tue Jun 11, 2019 12:11

June 28-July 1 Fri 9pm -Mon 6am and July 12-15 are the dates, although they may not all be needed.

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Re: M27 Closure and 60 mile Westbound diversion route

Post by SteveA30 » Thu Jun 13, 2019 09:34

Also, for anyone heading that way, the M27 is closed from J9-11 between 9pm Friday to 9pm Saturday June 14 both ways. Diversion along A27. May take a look but, that bit of A27 old road isn't hugely interesting.

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