Tower Foundations Concrete Delivery and pore times

[Eddcrosley]

Tower Foundations Concrete Delivery and Pour Times
I am at the planning stage in a multi site project that is very remote and have some sites that could have 2 hour access issues. How can I control this issue?
1. Time from truck loading to pour
2. Are there methods’ to extend the delivery time and maintain a viscosity require by industry standards.
(As in winter, we use heated loads to extend the cure and set time)
I very much appreciate any input.

Edd Crosley SR
TCE, Inc

 

[civilperson]

Dry batch the concrete, transport and then add water and do final mixing at the site. This gives the most flexibility for unforseen hang-ups.

 

[Eddcrosley]

Thank you for the response but we are talking about upwards of 150 Cyds per site. Is this doable with this methoid?

 

[civilperson]

At nine or ten cy per load, you need 16 - 17 truck loads no matter where you add water and mix. The set up of a calibrated water scale or flow meter is not hard or expensive compared to disposal of 10% of loads for time violations.

 

[Eddcrosley]

Thank you for the information it has been very helpful.

 

[frogit22]

You can use a set retarding admixture to extend the working time (such as daratard 17 by W.R. Grace).

 

[wyeit]

In similiar situations I've seen good results using DELVO Stabilizer, a retarder and water reducing admixture.

 

[JStephen]

We once did a remote job in TX that was about 90 miles from the nearest batch plant. The concrete guy gave us two options: Haul the stuff dry and add water at the site (good for one or two loads). Or, just move his portable plant down there and mix it there, which is what I think they did. Quantity wasn't that huge, either.

In remote areas, the batch plants don't normally have 17 trucks available, so they can't haul it all dry and start mixing.

Check with your concrete supplier, see what their ideas are. They're bound to have run across this before.

You could possibly add some construction joints where you wouldn't normally have them as well.

 

[Zambo]

I agree with Frogit22 retarder would be a good solution. You would still need sufficient transit trucks, but I expect that most batching plants can get 10 trucks for a special order.

 

[JStephen]

I'm not familiar with the retarder specifically, but have found that ready mix plants in rural areas are less likely to be familiar with additives in general- so once again, check with that supplier.