Momentz, maybe totally off base but last second info/hints on CSA based concrete not Portland based cements, (dont know much about the availabilty/properties of the HPC concretes) . For us DYI hobbyists the CSA cretes have advantages including -very low native shrinkage rates (0.1-3% !!, High strengths early and late- 11k psi comp but sigh more $. For mixing/prep. If you are ?using higher stength rapid setting CSA based concrete (( in the U.S. - " CTS Rapid Set" mixes available @Home Depot or Whitecap)) , not Portland based cements, FOR CSA 1. mix water and cement/concrete by weights 2. Water/C ratio ideal about 0.36% to 0.38 %. 3. To slow setup times of the mix to 1 -3 hrs by. A. using ice in place of water 1hr plus B. use citric acid 0.1% to 0.8% (to gain an hour, also use citric acid dose - 0.4% at 50 °F-10°C), use cheap food grade from. 3. GFRC well worked out. Lots of relevant concrete info on YT from concrete countertops vids but I think best engineering info and great practical & detailed information about end user use of using pure CSA from Jeffrey Girard P.E. on YouTube with several videos & PowerPoint on "TheConcreteCountertopInstitute" his 1hr 20 min video fantastic detailed use of CSA Chuck
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