Chris,Not to worry, that is a unique cement truck. Most in the US start as
standard truck cabs and frame assemblies built be major
manufacturers,purchased by small companies and fitted with the mixer stuff.
Moat all squirt the cement out the back. The on shown is built in Oshkosh,
Wisconson squirts the cement out the front, which relieves the driver of
having to learn all those backing up skills. Remember, this is the USA, and
that's a skill we have mostly lost, along with the ability to parallel park
and shift a standard transmission. Just from looking at them, I must think
they are expensive, moreso than others, as they seem unusually complex. But
somebody likes them.
But not all is lost, I understand that the RAF has just signed a contract to
purchase trainers from the USA. They are reputed to be a lot of fun to fly,
are built like a tank and are less expensive to maintain. But worry not,
having a propellor doesn't make the pilot look less manly.
-----Original Message-----
From: ChrisB
Sent: Friday, February 19, 2016 11:51 AM
To: Olympus Camera Discussion
Subject: Re: [OM] IMG: Repair of WWII Concrete
That doesn’t look very thick, Jim. Was that the runway or only a taxiway?
I ask because I’m fairly certain that the concrete at my old base, RAF
Brüggen, was probably twice as deep as that looks.
That mixer lorry looks very strange compared with ones that I’ve seen in the
UK.
Chris
On 18 Feb 2016, at 20:19, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:
I took a walk in the sunshine today at the local airport. Felt good!
This airport was built during WWII as an US Army Air Force training base
for B-24s, hence the concrete was very thick to withstand the wheel loads.
While much of it has held up well, places that received a lot of traffic
have developed cracks. A contractor has been hired to cut out these
broken areas and replace them with new concrete. ( It is interesting to
me that, while concrete made today in our area uses crushed limestone as
the aggregate, I have seen areas of the original pours that used creek
gravel, including a few mussel shells, as the aggregate.)
This image gives an idea of the thickness of the original concrete.
http://www.gallery.leica-users.org/v/OldNick/Thick+Concrete+3162.tif.html
<http://www.gallery.leica-users.org/v/OldNick/Thick+Concrete+3162.tif.html>
To tie the new to the old, the old concrete is drilled and rebar is
installed.
http://www.gallery.leica-users.org/v/OldNick/Drilling+for+Rebar+3163.tif.html
<http://www.gallery.leica-users.org/v/OldNick/Drilling+for+Rebar+3163.tif.html>
About half of this section has been replaced, as the crews work with
manageable pour sections.
http://www.gallery.leica-users.org/v/OldNick/Working+Concrete+3157.tif.html
<http://www.gallery.leica-users.org/v/OldNick/Working+Concrete+3157.tif.html>
The rotating mixer drum must be washed out after each pour.
http://www.gallery.leica-users.org/v/OldNick/Wash+Job+3161.tif.html
<http://www.gallery.leica-users.org/v/OldNick/Wash+Job+3161.tif.html>
And then, the truck heads back to the plant for another load. Multiple
trucks were in use, to keep the job moving at a workable pace.
http://www.gallery.leica-users.org/v/OldNick/Going+to+Reload+3165.tif.html
<http://www.gallery.leica-users.org/v/OldNick/Going+to+Reload+3165.tif.html>
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