Its a Highway Project as said in my post. Thanks for the info. Not sure I am your friend, but I have worked with many. I have been working DOD projects for the last 20+ years. Live in Okla worked at Edwards AFB for many years. The trick so it seems to get the 3000 in 3 hrs is using a cure...
Company just purchased a brand new Zimmerman Vol Mixer with the intent to mix rapid set concrete to use on highway project. Then the money people see the cost of rapid set material and want me to design a mix using Type III cement. I talked to a admix rep and the amount of liquid we will have...
True Ron: I have been doing airfield repairs for the past 24 years. Just seems today the young engineers lack experience in design or past work experience. They do not understand that a patch is just that , a patch. They are mystified that spall repairs done 12 years ago are failing. They...
Ron: Like drilling and placing small deform bars in the bottom of the patches? We have done that in past but budgets make it hard to put to much in small repairs. Have used Sika stuff with good results, but have been away from that type of product and was just checking on what was new out...
Lot of new and old product out there that is cost effective for spall repairs on airfields. Like to hear some feed back or suggestion of a good product to use on apron of airfield. Spall repairs will be 4" depth and under 2sf each. Air field is hard to get pcc patches to last due to...
Need to design a slump that can be adjusted to a 4" at the pump. Lot of times I see guys check a slump and get a 5" then they let the truck sit until it is a 3" or 4" to meet spec WHAT, its a 5" slump that is only setting up, it is still a 5". Sounds like a lab or mix design thing to me. Good...
Looking at a project in Louisiana to replace slabs on a runway. Bottom is 8" PCC with 9" Pcc on top, joints match. Slabs are 12.5 x 20. They want to take out full depth and replace with 17" pcc slab. Question, how will this effect the movement of the slabs around the full depth replacement...
Question to all. What is the best method for patching small (spalls) patches on an concrete airfield. Givin the area does not have to be open in a hurry no extream weather conditions just the best fix for patches 3" in depth with an average area of 2-4 sf. I have used epoxy with clean...
Getting ready to place some Econocrete, Lean Mix. Spec calls for 1200 @ 28 day. If strength exceeds 1200 spec requires us to saw the joints in the econocrete. 28 day breaks came in at an average of 1130 psi. I was wondering if sawing the joints exactly on the same pattern that the 14" PCC...
Looking for some advice of a joint seal to use in existing concrete runway that will have a new AC Overlay to help prevent the joint reflective cracks from starting so soon. I know they will work thru over time, just trying to fix a bad design. Thanks SB
1. How long were they in the molds before stripping? 24 hr
2. What were the temperature and relative humidity under the sheeting? Do not know
3. Were the edges rubbed with a stone prior to testing? Yes
4. Were they tested with tension on one of the side faces rather than the top or bottom...
The beams were covered with plastic sheet with wet burlap on top, placed in the cure tank 24 hrs. Burlap did not touch fresh pcc. The samples were part of the initial Mix Design, from the same batch. I ran 7 mix designs and all, but 1 fell from the 14 day break, the one that did not was a very...
Thanks everyone, I am on the same page as you all. I have seen the beams and the tank they were in, and half of the beam was in water and half was out of water. Also the beams were stacked up before being tested, not taken from the tank to the machine. We are addressing the problem, thanks to...
I just left a lab where the beams in the cure tank were only half full of water with no lime. The beams they made yesterday were in the back waiting to be put in the tanks tomorrow! I proceeded to strip the beams help log and place in the tank, add proper lime and fill vats with water. Not all...
Just broks some 28 day breaks and all of them across the board fell from 12-20% from the 14day break. We are using good crushed stone from MO with wash sand Type I cement and 16% fly ash. Nothing special about the mix, looking for 750@ 28 days. All of the mix's had the strength at 14 days...
