Watched a program on The History Channel recently where they demonstrated
prestressed concrete using shapes - the shapes were poured nearby, allowed
to cure then a number of metal rods or wires (like 1" OD) were pulled thru
opening in the concrete shape - when the wiring/rods were compressed by
tightening large metal thingies - kind of like nuts on a long stud threaded
on both ends - then put it thru a form and put washers between the nuts and
the form then tighten. Once stressed the concrete will be extremely
strong!''
I'll bet Wiki explains Prestressed Concrete much better than I can!
Later,
LarryT
91 300D
HR 45 would require any person owning a firearm to obtain a federal
firearms license. To apply for this license, you must provide a
thumb-print & medical records. Ask your Reps to Vote Against HR45!
,
----- Original Message -----
From: "WILTON" <wilt...@nc.rr.com>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Wednesday, August 05, 2009 6:10 PM
Subject: Re: [MBZ] O/T Concrete Mixer Trivia
But may not reach 100% (whatever that is) in OUR life times. BTW,
concrete is very weak in tensile strength (that's why it needs reinforcing
bars - rebar), but is very strong in compression.
Wilton
----- Original Message -----
From: <pm7...@comcast.net>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Wednesday, August 05, 2009 11:01 AM
Subject: Re: [MBZ] O/T Concrete Mixer Trivia
Concrete reaches about 90% tensile in 21 days, It continues to get higher
the longer it cure. I THINK Hoover damn is abot 98% and creeping up.
--
Peter Arnold
Windsor, CT
----- Original Message -----
From: "Curt Raymond" <curtlud...@yahoo.com>
To: "Diesel List" <mercedes@okiebenz.com>
Sent: Wednesday, August 5, 2009 10:20:43 AM GMT -05:00 US/Canada Eastern
Subject: Re: [MBZ] O/T Concrete Mixer Trivia
I read somewhere that the concrete inside of Hoover dam was intended to
take some huge amount of time, like 50 years, to cure.
-Curt
Date: Wed, 5 Aug 2009 09:06:13 -0400
From: "LarryT" <l02tur...@comcast.net>
Subject: Re: [MBZ] O/T Concrete Mixer Trivia
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Message-ID: <61d8f2c2ab0f4c578e9d381afbdb7...@toshibalaptop>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
concrete trivia ;-)
When building very large concrete structures, like dams, pipes are built
into the concrete so cooling water can circulate to keep the concrete
cool
as it cures to prevent cracking. New slabs are wet down & covered with
plastic dropcloths to keep the water from evaporating too quickly.
The curing is a chemical reaction between the cement and water - even if
it's cold, once the reaction starts it will create its own heat -
Larry T
91 300D
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