Tell me about concrete...

10/22/2024 5:33pm
Jeff K wrote:

Structural concrete, Mostly flood control and storm drain.  Commercial, residential and public works. You ?

Primarily commercial buildings. Schools, fire stations, apartment complexes, and assisted living facilities have been the most common projects the last couple years.

For the most part we try to limit our scope to the building footprint, but will pick up exterior retaining walls, stairs, and ramps when applicable. We avoid sidewalk and curb as it’s usually a completely separate mobilization from the building scope. The curb and sidewalk companies around here typically combine sidewalk/curb with the paving scope.

Have you guys been slower this year? New project awards seemed to slow down significantly when the interest rates went up, so we’ve been placing more bids on renovations as well. Not my favorite type of project as the GC’s capability to sequence trades really impacts production. 

Falcon
Posts
12411
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11/16/2011
Location
Menifee, CA, USA
10/23/2024 7:14am
Falcon wrote:
The little I know about concrete blows my mind. Here are the two facts I know:-The coefficient of thermal expansion is the same as that of...

The little I know about concrete blows my mind. Here are the two facts I know:

-The coefficient of thermal expansion is the same as that of steel. In other words, when concrete heats up, it gets bigger in the same dimensions as steel (that's why they use an iron alloy in rebar). This is why you need expansion joints between sections. 

-Concrete isn't completely dry for up to 100 years. It is gaining strength the entire time, too. After the drying is complete, only then does it begin to weaken. 

Gworm wrote:
I’m not going to be the one, but someone will chime in and tell you that concrete doesn’t dry,,,It cures.  Don’t get mad at me, I’m...

I’m not going to be the one, but someone will chime in and tell you that concrete doesn’t dry,,,

It cures.  Don’t get mad at me, I’m just warning you  

Thanks for the heads-up. 😁

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ns503
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4/1/2008
Location
NS Toolies, CA
10/23/2024 1:33pm

Tell me too. 

Likely pouring a slab here next week. Outdoors. An apron, kind of. Will see some heavy stuff occasionally like a 100hp tractor with 2000lbs on a pallet on the front end loader. Old one cracked. Been cracked a long time. Will be relying on the plant for mix recommendation. Varies from 4-6" thick. Kept plowed in winter, moderate climate but occassional -20c temps. Suggested recipes?

Jeremy A.K.
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1449
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1/5/2022
Location
North Tonawanda, NY, USA
10/23/2024 3:51pm

Did this one 2 years ago ,cut 2 expansion joints in it . Even with the northern winter ,they haven't opened up yet.

1000021042
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The Shop

10/23/2024 5:25pm

Do they still offer concrete with those little polypropylene noodles to help with not cracking?

Gworm
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2777
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4/5/2017
Location
Monett, MO, USA
10/24/2024 12:21pm
img 1 1729796994397

Back in the 90’s I was building a bridge for a local county Rd district. The first concrete truck of the day backed up and hit the brakes and about a wheelbarrow full sloshed out the back. He had left his water on the whole way to the job. 
I told him as he got out of the truck to call in and have them send another load quickly, and he needed to figure out where to go with that mud. He argued that it would be fine. I guess he didn’t want the butt chewing that was coming his way. 
I ended up getting on his radio ( before cell phones) and calling in because he wouldn’t. 
 

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lumpy790
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9/18/2007
Location
York, SC, USA
10/28/2024 7:55am
JWACK wrote:

How do Walmart floors not crack.?  In my area they are perfect.   

BAREIN wrote:

good concrete, prep, and proper saw cutting at the optimal time

My son traveled and poured lots of the Walmart and Maynard floors in the Midwest. He is now the guy that reads the concrete and cuts it. Hours can be crazy for cutting it. 

He has been in with a good large company for several years and has been moving up the chain so he must be doing things right. 

He pointed out some things that he saw being done wrong to his foreman in the design of a drive through fast food so it had water flow problems and had to be torn out and poured again and it caught the owners eye and thats when he started moving up in the company.

Bad part is It is a seasonal job and its getting close to layoff time for him.

I keep telling him to start his own business pouring. 

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