Polycarboxylate Admixtures
Posted by John on October 30, 2006
What is the amount of mixing time required for the new generation of HRWR to produce thier full effect on the slump of the mix? Where did you get that shirt.
Dear John,
I do not think there is a significant difference in the amount of time needed to mix conventional and new HRWR to achieve similar slump results. May be if the dosage of the HRWR is very low and it is added directly to the concrete and not along with the mixing water, it might take a little longer time for the HRWR to completely mix in the entire volume of the concrete and create the desired effect.
For the mixing time needed, follow the recommendations of the concrete mixer manufacturer and then use your our own judgment by observing concrete mixed for different times. Normally a ready mixed concrete mixer requires 75 revolutions for initial mixing and 30 revolutions (at mixing speed) when anything is added to a load that is already mixed.
As for the shirt, I got it from a golf course in Scottsdale, AZ. Thanks for asking.
Thanks
