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Start with one bag of Set Accelerator (5.6 oz) for each sack
of concrete or mortar (usually 60-80 lbs). This equals about
1% calcium. Up to 3 bags per sack (about 3% calcium) may be used
for faster acceleration. It will not hurt concrete to dose at
higher rates, but you will probably not get additional benefit.
You will usually get about 1-3 hours reduction in set time depending
on temperature.
Factors that affect set acceleration time:
1. Percent of cement in your mix: the calcium in Set Accelerator
reacts only with cement, so rich mixes will require higher doses.
2. Temperature. The acceleration effects are faster at lower
temperatures. A 2% dose will give about 1 hr set time reduction
at 85 F, and 3 hr set time reduction at 40 F.
3. Number of bags used. Higher doses give faster set times.
To calculate dosage based on precise weight of cement:
3 bags of Set Accelerator per 100 lbs of cement = 1%.
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