I'd reach out to Euclid and BASF and see what they recommend for non-chloride accelerating admixture. Ideally you'd find one that has water-reducing properties and a delayed set property as well. This allows the contractor to pour and finish their concrete like normal without trying to race against the clock and the reduced water helps with shrinkage cracking and concrete density.
Accelerated mix design should really be under the means and methods of the contractor mixing the concrete. I'd get some spec language from BASF and/or Euclid and have the contractor submit a mix design for your approval. As with all new mixtures the first batch will be a bit of a learning experience and they'll fine tune the properties on the subsequent batches. Make sure proper testing is done on the batches unless they already have the required historical data to prove it meets strength and other design properties.
The only thing I'd really worry about is it setting up in the forms between pours. I reviewed a job a while back where the concrete was shipped 2+ hours and even with set retarders the foundation wall ended up full of cold-joints and honeycombing. Thus, be very clear that if they delay too long between pours they may junk the entire wall or require extensive repair.
Ian Riley, PE, SE
Professional Engineer (ME, NH, VT, CT, MA, FL) Structural Engineer (IL, HI)
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Explanation:
(i) Accelerators are used to increase the rate of gain of strength in the concrete.
For more information, please visit Concrete Accelerators.
(ii) It is an admixture that causes an increase in the rate of hydration of the cement and thus shortens the time of setting, increases the rate of strength development, or both.
(iii) Calcium chloride is a common accelerator, used to accelerate the time of set and the rate of strength gain.
Example: Calcium Chloride, Silicates, Fluorosilicates, Triethanolamine etc.Calcium Chloride, Silicates, Fluorosilicates, Triethanolamine etc.
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