Search results for query: *

One other issue to look at is the coring process in itself. if the cores show signs of poor core work, that could also affect your results. Check to make sure the cores are smooth, with no 'ribs' caused by a wobbling core machine. I know I should say this, but make sure they didn't get any...

Thanks, I gave all the data I could to the contractor and testing agency, and have not heard anything back. I think the engineer went with smaller, since I have not got a call from the testing agency or inspector.

Heres the link for NRMCA, however, it is required to be done by a licensed engineer. http://www.nrmca.org/products/certification/plantandtruck.asp You can also check ACI 311 "Guide for concrete plant inspection and testing of ready-mixed concrete" and ACI 363 "Guide to quality control and...

Henri2 - Thanks, that is a big help! Especially when they compared 2x's to 6x's. I will forward that link and see where it leads regarding the engineer.

Not sure of the specifications, this is coming from a testing agency asking me about this. As for sizes used for mix design, The supplier did qualify thier mix using 2x4 cylinders. And since we are looking at piles, would we not want confined compression results, instead of shear, since the...

Can anyone either show me or tell me where to find the reason why augercast grout sample sizes are 2x2 or 2x4? I have an out of state engineer who requires 6x12 cylinders for augercast grout. And he informes me that unless I can show why 2x2 or 2x4 break more accuratly and consistently than...

If your in Washington State, WWW.WABO.org, and just check for "special inspection agencies'. That lists all approved agencies in Washington State.

Seattle allows the use of 4x8's for virtually all sampling and testing. This it to include mixes over 8K. We have found that 4x8's provide acceptable results, and have even been found to provide more consistent results. We noticed that 6x12's sometimes disappeared, were 'damaged' on site, not to...

Can anyone either show me or tell me where to find the reason why augercast grout sample sizes are 2x2 or 2x4? I have an out of state engineer who requires 6x12 cylinders for augercast grout. And he informes me that unless I can show why 2x2 or 2x4 break more accuratly and consistently than...

I have sample groups that include anywhere from 1 to 3 individual samples. How would one set up a control chart using excel for this situation? Would I have to calculate the control chart constant for each sample group, and enter that into a control chart? I currently am doing it based on the...

Anyone know of any documentation on the performance of shotcrete construction joints both using and not using waterstops of any kind? I am aware of shotcrete's exceptional bonding at those surfaces, and the lack of needing waterstops for that very reason, but without any documentaiton, its hard...

A question has come up, and I am unable to find the answer. A contractor placed a cross beam in an older building as a retrofit, the old beam is indicated on the plans to have SFRM applied, but not to the new cross beam, all the technical directors I have spoken with tell me that for heat...

City of Seattle has learned alot using shotcrete in sturcural aplications, and we have found that the bond between exisiting roughened concrete and new shotcrete is exceptional, and does not require additional bonding agents. The shotcrete paste is literally 'blasted' into the microcracks in the...

Has anyone worked with or have performance data regarding substituting fly ash for portland cement in augercast grout? I am looking for shrinkage, modulus of elasticity, strength gain, etc.

henri2, I have recently attended an ACI meeting regarding the documents from NRMCA, with alot of discussion on who is responsible, how it will work, what challenges remain. But City of Seattle Building Code requires a certain amount of cement for a certain strength level. If the suppliers want...

Does anyone have any views or worked with Performance based concrete, and what type of testing during placement was called out for, and what the results were? I am looking at Special Inspection testing of plastic concrete, and the results, including any comparisons to a similar (ingredient type...

Has anyone done any studies or heard about the effects of slurry water containing trace amounts of admixtures on high strength (above 6K) concrete? And can those trace amounts be detected in hardened concrete?