Fast track concrete

I recently attended the kick-off meeting for a really interesting and challenging project. Mott MacDonald are working with Transport for London to help them develop a specification for concrete for their track repairs.

“Bread and butter to you”, I hear you thinking; but just a minute I’ve not told you everything yet. The concrete is being used as part of a Mechanised Renewal Vehicle process and needs to be batched in the depths of the London Underground network. It needs to be quality controlled, accurately batched, tested, placed, finished and one small final point……

make 15MPa strength at 1 hour.

If it doesn’t, a significant number of the up to 5 million journeys made each day on the London Underground network will be disrupted.

Typically, the workforce in the Track Delivery Units (TDU) need to get on site, smash out the concrete currently holding in the rails, clear up the rubble, fix the rails in place and then pour up to 9 cubic metres of this fast strength gain concrete. Quite a challenge in the small overnight engineering windows available on the network. To make the project even more challenging, wouldn’t it be great to reuse the concrete broken out as aggregate in that days, or probably more realistically, a future concrete pour.

I’ll let you know how the work progresses but if any material suppliers out there have any products they would like me to consider, then please do not hesitate to contact me through this blog or look me up on LinkedIn.

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THE SPY WHO LOVED ceMEnt

I’ve arrived in Dubai on the next leg of what my son calls my mini Gap Year. The change of view from my Bangladesh Hotel to my Dubai Hotel is welcome.

Room with no view (Dhaka)

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Room with a view (Dubai)

Somebody once told me that during the cold war British spies operated under cover as cement salesman. The fact that cement goes everywhere in the world apparently offered the perfect cover for their clandestine activities. I don’t know if this is true, but I rather like the thought of a smooth talking cement salesman suggesting your concrete should be “shaken not stirred”. I tried googling to see if I could find any evidence and I did find some interesting facts that suggest it might not be a million miles from the truth.

For example the connection is made by Lord Selborne, who was Director of Cement in the Ministry of Works during WWII and left this role to become Minister of Economic Warfare, which put him in political control of the Special Operations Executive, the organisation responsible for organising clandestine activities in occupied Europe. Atlantic Wall, a musical based on a true storey about the French Resistance has a character, Henri Giraud, an ex- First World War artillery officer, recruited to develop a fledgling spy network in Normandy. He uses his job as a cement salesman – which allows him to travel freely between Paris and his home town Caen – as cover for his intelligence work.

Why this interest in espionage and cement? Well it’s partly to add a bit of glamour and excitement to the “grey” world I work in and partly to put into context the second part of this post. I’m taking the opportunity of being in the UAE, to promote the activities of the small part of Mott MacDonald I belong to. While our, Bridges, Tunnels, Ports, Coastal and Offshore operations have no problem selling their skills – “they do what it says on the tin” as the advert goes, our function is not so clear.

I work for Special Services! Our team has nothing to do with clandestine operations (although I would say that wouldn’t I) but we are the repository that ends up with projects that nobody else wants to and/or can deal with. We were formed when alkali-silica reaction was dominating the concrete world back in the mid-1980s and there was a belief that they needed to bring together structural and materials expertise to address the problem. We’ve developed a wide-range of skills over the ensuing years as problems have come our way.

Some of our areas of expertise are shown below. Do not hesitate to contact me if you’d like to find out more about any of these special services we provide.

I apologise if you can’t get the image of me wielding a Schmidt Hammer with a licence to kill out of your mind. In that case I’m just glad I didn’t mention the other kind of special services that are offered by certain kinds of ladies in the personal ads of your local newspaper. Oh dear, too late!

List of some of our Special Services

  • Dynamic Analysis,
  • Forensic engineering,
  • Slab track analysis and design,
  • Human induced vibration,
  • Durability modelling and design,
  • Cathodic protection,
  • Wind engineering,
  • Blast analysis and design,
  • Noise and vibration measurement, analysis and mitigation,
  • Short-circuit analysis
  • Fire analysis
  • Fatigue analysis
  • Aerodynamics,
  • Finite element modelling
  • Seismic design of structures
  • Non-linear buckling analysis
  • Analysis of masonry vaulted structures,
  • Flood containing retaining walls,
  • Expert witness
  • Alkali-activated slags
  • Stress corrosion cracking,
  • Welding investigations,
  • FRP design
  • Tribology,
  • Through life asset management,