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PostPosted: Thu Oct 12, 2017 9:07 pm 
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Yesterday morning I had delivery of GEN 2 concrete for 15 x 9 ft slab at the depth of 4 inches. This is my first concreting job and I'm a little concerned the mix may have been too wet.

Since I'm new to this I was unsure of exactly how wet or dry it should be, asking the driver as it was unloaded wasn't much help either. Looking back I'd say a third of the barrow loads were pretty sloppy with the rest being an average wet/dry mix.

https://imgur.com/a/8tupn

I didn't take a great deal of tamping for the surface to become creamy, I finished off with a bull float and some wet content spilled over the formwork.

Just after a few leaves landed on the surface, it was soft enough that an imprint was made. I coveted with polythene and then inspected this afternoon. I can scratch the surface easily with my fingernail and make an indentation, is this normal?

36 hours has passed and not much has changed, will the surface be weak as a result?

Thanks :)


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PostPosted: Fri Oct 13, 2017 11:54 am 
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The Z'eer wrote:
Yesterday morning I had delivery of GEN 2 concrete for 15 x 9 ft slab at the depth of 4 inches. This is my first concreting job and I'm a little concerned the mix may have been too wet.

Since I'm new to this I was unsure of exactly how wet or dry it should be, asking the driver as it was unloaded wasn't much help either. Looking back I'd say a third of the barrow loads were pretty sloppy with the rest being an average wet/dry mix.

https://imgur.com/a/8tupn

I didn't take a great deal of tamping for the surface to become creamy, I finished off with a bull float and some wet content spilled over the formwork.

Just after a few leaves landed on the surface, it was soft enough that an imprint was made. I coveted with polythene and then inspected this afternoon. I can scratch the surface easily with my fingernail and make an indentation, is this normal?

36 hours has passed and not much has changed, will the surface be weak as a result?

Thanks :)


Your slab will be suitable to build off when it has cured for at least 3 days & nights.
While it sounds like the slump was a bit loose during the part of delivery, the supplier will be professional and only an appropriate amount of water will have been used in the mix at the batching plant.
I think you a worrying unduly.

Davyp1



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PostPosted: Fri Oct 13, 2017 12:56 pm 
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concrete curers by chemical reaction and not through air drying just give it time


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PostPosted: Fri Oct 13, 2017 1:49 pm 
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It is more of a worry the other way when it dries too quickly. Do not worry about any water rising to the surface, it is the natural curing process. As said it will get harder over a week, it was just a wet mix.

DWD



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PostPosted: Sat Oct 14, 2017 12:20 pm 
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davyp1 wrote:
The Z'eer wrote:
Yesterday morning I had delivery of GEN 2 concrete for 15 x 9 ft slab at the depth of 4 inches. This is my first concreting job and I'm a little concerned the mix may have been too wet.

Since I'm new to this I was unsure of exactly how wet or dry it should be, asking the driver as it was unloaded wasn't much help either. Looking back I'd say a third of the barrow loads were pretty sloppy with the rest being an average wet/dry mix.

https://imgur.com/a/8tupn

I didn't take a great deal of tamping for the surface to become creamy, I finished off with a bull float and some wet content spilled over the formwork.

Just after a few leaves landed on the surface, it was soft enough that an imprint was made. I coveted with polythene and then inspected this afternoon. I can scratch the surface easily with my fingernail and make an indentation, is this normal?

36 hours has passed and not much has changed, will the surface be weak as a result?

Thanks :)


Your slab will be suitable to build off when it has cured for at least 3 days & nights.
While it sounds like the slump was a bit loose during the part of delivery, the supplier will be professional and only an appropriate amount of water will have been used in the mix at the batching plant.
I think you a worrying unduly.

Davyp1


The driver requested to how wet or dry I wanted the mix when it was deposited from the truck to the barrow. At times it was pretty sloppy, at other points far drier.

Although, as you say an appropriate amount was used at the batching plant, more was added via the driver as it became adjusted. Could this be detrimental?


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PostPosted: Sat Oct 14, 2017 12:23 pm 
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flash22 wrote:
concrete curers by chemical reaction and not through air drying just give it time


I did read that, and a full 28 days is needed to reach optimum strength.


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PostPosted: Sat Oct 14, 2017 12:34 pm 
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dewaltdisney wrote:
It is more of a worry the other way when it dries too quickly. Do not worry about any water rising to the surface, it is the natural curing process. As said it will get harder over a week, it was just a wet mix.

DWD


Thanks for the vote of confidence:) just a concern born from being an novice in this field and perhaps reading too much off the Internet


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