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Ms. Jenn
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 Posted: 06/28/05 - 08:24 Post subject: They'll just add more water...
The concrete company pouring slabs and such want to use a 5" slump, when the design calls for a 3" slump. I agree with the structural engineer that you cannot achieve a 5" slump for that particular mix design. Whilst talking about this thing...the project engineer here says "You can if you just add more water". "You can't add more water, it affects the strength" "It just ups the water to cement ratio and they put enough cement in there to cover the strength"
WRONG WRONG WRONG! The water cement ratio is directly tied to the strength. The amount of cement in that mix is for that specified strength.
It's like saying add more water to your cake recipe, it'll come out ok. Right.
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JUJR
Grunt
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Joined: 20 Feb 2005
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Location: www.johnnydu.com
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Posted: 06/28/05 - 08:30 Post subject:
knob  hope this isn't in a high traffic area...near me 
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Ms. Jenn
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Posted: 06/28/05 - 08:49 Post subject:
This is for a university building.
I've said my peace and the structural engineer will reject it. If the concrete company places a 5" slump in those areas, the engineer will make them rip it out and replace.
If I see it, I'll bring it to the engineer's attention.
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jrjo
Gone Fishin
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Posted: 06/28/05 - 09:43 Post subject:
I guess you've moved beyond the jrjo-mix-cement-in-a-wheelbarrow/add-water-til-it-looks right technique.
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Ms. Jenn
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Posted: 06/28/05 - 09:47 Post subject:
| jrjo wrote: | | I guess you've moved beyond the jrjo-mix-cement-in-a-wheelbarrow/add-water-til-it-looks right technique. |
Yes. I used your method while barricading the bottom edge of the fence from my doggie's paws, though. Don't tell 
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marathonrnr262
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Posted: 06/28/05 - 10:52 Post subject:
That is assuming they can get the concrete to begin with. I don't understand this but a lot of construction around here has been placed on hold due to unavailable concrete.
My understanding is the concrete comes from China and they just cannot keep up with the demand.
Sheldon
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HYPERASHEL
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Location: The South's Sauna, Atlanta
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Posted: 06/28/05 - 11:43 Post subject:
| Ms. Jenn wrote: | This is for a university building.
I've said my peace and the structural engineer will reject it. If the concrete company places a 5" slump in those areas, the engineer will make them rip it out and replace.
If I see it, I'll bring it to the engineer's attention. |
please tell me this aint an engineering university. THAT would be funny (provided no one got hurt when it fell down)
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Ms. Jenn
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Posted: 06/28/05 - 11:51 Post subject:
Concrete doesn't come from China.
Concrete is a mixture of sand, gravel, water and cement. The concrete mix might also have chemical additives such as water reducer, superplasticizer or fly ash mixed in for cost measures and workability.
There is a Type I cement shortage in the United States. The cement supplier to the concrete ready mix plants say they don't know when the cement shortage will end. Most plants are currently using Pozzolan Modified Type I and adding more fly ash to compensate for the shortage.
What does this really mean? Costs are higher.
The several billion dollar Mopac toll road in Austin isn't helping the shortage (I hear they're going to concrete it, not asphalt), neither is Wal-Mart. The cement supplier for this area is in Arkansas and that is where all their Type I cement is going when it comes in.
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marathonrnr262
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Posted: 06/28/05 - 13:30 Post subject:
| Ms. Jenn wrote: | Concrete doesn't come from China.
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My bad, its the CEMENT that comes from China, how stupid of me to get the 2 confused.
http://www.welcome-to-china.com/biz/fyi/7ap.htm
And yes, they are in a shortage. Both because of the growth of China and the tonage they are exporting.
Sheldon
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