Skip to comments.
High-tech concrete technology has a famous past
National Institute of Standards and Technology (NIST) ^
| March 16, 2011
| Unknown
Posted on 03/17/2011 7:00:58 AM PDT by decimon
click here to read article
Navigation: use the links below to view more comments.
first 1-20, 21-27 next last
Caption: X-ray microtomograph (left) shows pores (blue) that remain within lightweight aggregates (LWAs) after water has migrated from the pre-wetted materials during the first day of hydration. In the two-dimensional image (right), the emptied pores are superimposed over the original microstructure (hydrating cement paste is white, sand is light grey, and LWA is dark grey), illustrating the detailed pore structure of LWA particles.
Credit: NIST
Usage Restrictions: None
1
posted on
03/17/2011 7:01:01 AM PDT
by
decimon
To: SunkenCiv
Don’t ask why ping.
I guess that Hadrian’s boys didn’t need to know why to know what worked.
2
posted on
03/17/2011 7:03:04 AM PDT
by
decimon
To: decimon
That's right. My Italian ancestors invented concrete. We made things out of it. Aqueducts, Coliseums.......shoes
3
posted on
03/17/2011 7:04:29 AM PDT
by
massgopguy
(I owe everything to George Bailey)
To: decimon
4
posted on
03/17/2011 7:07:26 AM PDT
by
Harpo Speaks
(Honk! Honk! Honk! Either it's foggy out, or make that a dozen hard boiled eggs.)
To: massgopguy
That's right. My Italian ancestors invented concrete. We made things out of it. Aqueducts, Coliseums.......shoes My Italian ancestors were Calabrian...hard heads...good with masonry. ;-)
5
posted on
03/17/2011 7:08:03 AM PDT
by
decimon
To: Harpo Speaks
Reardon Concrete?Reared on concrete? Well, I am a New Yorker. ;-)
6
posted on
03/17/2011 7:09:55 AM PDT
by
decimon
To: decimon
So, you essentially take a ground, highly porous material, saturate it with water and use it as a portion of the fines?
7
posted on
03/17/2011 7:25:53 AM PDT
by
fso301
To: massgopguy
That's right. My Italian ancestors invented concrete. We made things out of it. Aqueducts, Coliseums.......shoes.LOL. One size fits all.
8
posted on
03/17/2011 7:39:47 AM PDT
by
USMCPOP
(Father of LCpl. Karl Linn, KIA 1/26/2005 Al Haqlaniyah, Iraq)
To: fso301
So, you essentially take a ground, highly porous material, saturate it with water and use it as a portion of the fines?I don't know. There is a 5 meg PDF at the link for anyone sufficiently interested.
9
posted on
03/17/2011 7:41:19 AM PDT
by
decimon
To: decimon
MN-DOT should hire Romans to build our bridges.
10
posted on
03/17/2011 7:56:48 AM PDT
by
WOBBLY BOB
( "I don't want the majority if we don't stand for something"- Jim Demint)
To: fso301
It’s conventional lightweight structural aggregate — (regional — here in So Cali it’s expanded shale, but other areas may use slate or clay). So it’s not really “highly porous”, but it does absorb some percentage of water (say 5-15%) over a 24 hour period.
11
posted on
03/17/2011 8:20:47 AM PDT
by
absalom01
(You should do your duty in all things. You can never do more, you should never wish to do less.)
To: decimon
One of the reasons concrete plants try to keep their aggregate stocks wet to the SSD (saturated, surface-dry) condition. The key, though, is knowing how much water content the aggregate has, because it has to be accounted for in the mix design.
12
posted on
03/17/2011 9:59:07 AM PDT
by
JRios1968
(Laz would hit it!)
To: decimon; StayAt HomeMother; Ernest_at_the_Beach; 1010RD; 21twelve; 24Karet; 2ndDivisionVet; ...
13
posted on
03/17/2011 3:45:39 PM PDT
by
SunkenCiv
(The 2nd Amendment follows right behind the 1st because some people are hard of hearing.)
To: WOBBLY BOB
MN-DOT should hire Romans to build our bridges Either that or don't stack so much equipment on the bridge when your resurfacing it.
14
posted on
03/17/2011 3:57:22 PM PDT
by
Sawdring
To: SunkenCiv; decimon
Visiting the Pantheon was a highlight of my touring Rome. Because it has been continuously maintained it looks like it could have been built 100 years ago instead of 1900. It’s like stepping into a time machine and visiting ancient Rome. Totally awesome.
To: decimon
",img src="http://www.engr.ncsu.edu/news/media/images/canoe80a.jpg">
NC State Concrete canoe in competition
16
posted on
03/17/2011 4:34:15 PM PDT
by
bert
(K.E. N.P. N.C. D.E. +12 ....( History is a process, not an event ))
To: bert
17
posted on
03/17/2011 4:52:54 PM PDT
by
decimon
To: colorado tanker
Thanks colorado tanker. It’s strange to think how Rome would look today had it not burned in the reign of Nero.
This Pantheon was built to replace the somewhat earlier one that burned (it was brick and wood), but the original inscription was restored on a building Agrippa never lived to see.
18
posted on
03/17/2011 4:59:11 PM PDT
by
SunkenCiv
(The 2nd Amendment follows right behind the 1st because some people are hard of hearing.)
To: SunkenCiv
The fire enabled Nero to build his huge Golden House. And IIRC, Vespasian built the Colosseum on part of its grounds. Yes, big changes from the fire.
To: colorado tanker
There is a brand new (a few year’s old) tall building here in Seattle made of concrete. Except it seems that some union worker skimped on some of the details, and did not coat the tips of most of the rebar in epoxy.
The rust problem started showing up right away. Repairs cost something like $1.5 million. But they still didn’t work. The tenents have all been moved out and demolition of the entire building (14 stories???) is forthcoming.
(For want of a nail, the shoe was lost.....)
20
posted on
03/17/2011 6:43:05 PM PDT
by
21twelve
( You can go from boom to bust, from dreams to a bowl of dust ... another lost generation.)
Navigation: use the links below to view more comments.
first 1-20, 21-27 next last
Disclaimer:
Opinions posted on Free Republic are those of the individual
posters and do not necessarily represent the opinion of Free Republic or its
management. All materials posted herein are protected by copyright law and the
exemption for fair use of copyrighted works.
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson