Ron and RWW0002:
The cylinders are not being steam cured, but the actual product is; we are going to core the finished specimens and perform petrographic analysis. ASR mitigation should have been accomplished by the low alkaline Type II cement and the high pozzolans. The source pit is...
Concretemasonry: Yes, it's all appropriate testing and sampling (ASTM, ACI, State accreditation, etc), that's not the issue. This is a state lab and two separate highly accredited testing labs, all are independently coming up with similar results. Thousands of other cylinders are tested as part...
Does any have any insight or experience with concrete actually decreasing in strength from 28 to 56-days? We are having three different entities test cylinders from a precast plant independently and all are coming up with similar results. 28-day strength is around 10-12,000 psi compression and...
I've enjoyed using SLIDE in the past, it's powerful and user friendly, I think they are on version 6 or 7 now, I used 5 primarily. It's 2D and works well with water issues and seismic loads. For straight real world analysis of common earth structures and slope stability, the non-PhD-type stuff...
I'm trying to find documentation for sodium silicate when used as a backfill grout additive. It is commonly used in that application, but there is no ASTM test or quality assurance measure that I can find to check it's performance, either alone or when incorporated into the grout. I am already...
The minimum required loads to apply to a handrail or guard per the 06' IBC section 1607 are the greater of:
1. 50 lbs per linear foot in any direction
2. 200 lbs point load applied to
If you are talking about vehicle impact loads, that's varies between IBC and AASHTO, IBC is 6 kips.
Based on the cantenary shape a banner's support wires would take I'm finding loads do increase versus a standard rigid sign, but the laymen's documentation I've found on banner sites indicates that the shape of the banner also decreases and they (the banner industry) use a reduced size and a...
I found the CERM to be vastly superior to the SERM book, the only exception being post-tension/prestress design, which only appears in the SERM. The CERM is worth having just in general engineering practice, it's an amazing collection of engineering knowledge and I'm not being compensated by...
I'm designing some flag poles for a banner that stretches across a street. I've reviewed the ANSI/NAAMM 1001-07 document which addresses wind forces on flags quite well. It does not address wind forces on a banner supported on both sides, which acts more like a parachute than the wind forces on...
Worst soil. Ever. The pier is about 7 feet deep, and it is literally the only component on this project that hasn't previously failed, so I'm totally comfortable with the previous design.
What you are suggesting sounds like what I have drawn basically. The angle of the taper on the new footing...
P/A + M/S doesn't account for the support a pier provides, that's the problem.
There's a flagpole, or pile type analysis that takes lateral loads laterally along the side of the pier, and a footing analysis that takes loads at the bottom of the footing, but I think it's overly conservative to...
