From what I see, our mix time needs to be a bit over 20 minutes. At 20 minutes the slump seems lower, and stability with the HRWR is border line. After mixing it another 10, the flow is increased and the mix is stable. Still getting air voids.
Sorry for the delay in response. I stopped getting emails for some reason. Anywho. Initially I mis-spoke. Horizontal form finishes are fine, not to hard to work, and can get smooth or stamped if needed. It is the vertical finish from the form where i am still seeing air voids. Have tried a...
First off...I wish I could reach through this screen and shake your hand sir. This is like a dream, finally talking to someone else who runs a plant and actually knows what's going on. Thank you.
I did a batch today, increased the air to .53 oz per 100wt, increased the Type A to 4oz/100wt, and...
Most of our product line only requires 4000psi. Though with the current design over 6000 is common
I am using a small amount of air. 2 oz per yard (650 lbs cem) was giving me 5%, however this was with my old mix design and it had far more sand. Almost 1600 lbs. I think I need to increase it but...
Did a trail batch today. Used 3oz per 100wt of WRDA 27 to reach a 2.5 inch slump maintaining a .44 w/cm , then mixed in the HRWRA 575 at 5oz per 100wt. Im pleased with the results. The mix was stable and flowed well, but I think I can push it further, either a higher dose or cut some of the...
Anyone see any issues with my batch weights? Thinking about taking out some of the sand to reduce some of the surface area.
Can I use a WRA to meet the w/c ratio and then use the HRWR to get it self concolidate or is that redundant? My grace specs say the two admixtures are compatible.
Thanks for the responses. Unfortunately round agg around here is rare. (Idaho) Everything is crushed. A void free finish is possible with the HRWRA as we have had it working for a while, but then recently something has changed. Aggregate gradiations or Im wondering about excessive fines in...
Goal is to not have to vibrate our precast forms. Max w/c is .44 for our vaults. After the addition of Adva 575 HRWRA at 5oz per 100wt of cement the mix is unstable and segregates. A grace rep said get the batch to a 1" to 3" slump before adding the HRWR, however to achieving a 2" slump exceeds...
