As the engineer on a project, I have been asked to inspect some rebar that has been sitting outside for over a year while the project was temporarily on hold. Naturally, the rebar has rust on it in many locations. It is visually evident that there has been no loss of material (which could be...
I'm not sure exactly what you mean about the weak points all over the bottom face. But strictly from a strength standpoint, there is no question that these shale bricks are holding up better than the concrete bricks do. There are always numerous concrete bricks that get crushed when they are...
Strictly from the standpoint of having moisture permeate through the brick itself. I find it hard to believe that the shale brick would be less resistant to water penetration than the concrete brick. The shale brick had a very dense structure whereas the concrete bricks appear to have the...
Thanks for responses.
Maybe to ask the question in a different way to try to understand all of the issues better: Even if there is some local cracking around the clay bricks, given that the mud mat is present to provide a barrier to moisture, would these cracks really be that harmful?
The...
I am currently working on a project where the contractor wants to use clay bricks to support the bottom mat of reinforcing (They are actually shale bricks with test breaks well above 10,000 psi).
I was told early in my career that clay bricks should not be used to support rebar because they...
In the 1983 AISC article "Design of Headed Anchor Bolts" by Shipp and Haninger, it states:
"Where plain bars are used, the equivalent anchorage may be accomplished by threading the embedded end of the bar and using one heavy hex nut with bolt threads "staked" at two places below the heavy hex...
Ron,
Regarding your item #2, I am checking some roof joists for a new mechanical unit. The existing roof deck has what is referred to on the existing drawings as "insulating concrete". It is on top of a 26 gage metal form deck. The project is a mall in MN that was built in 1965. Would this...
Thanks, SlideRuleEra. I went and looked at one of the reference books we have and was able to verify your recommendations and the definition of a 'continuous reinforcement' for pavements. Thanks for the direction.
I agree that they probably will not need any construction joints for this slab.
What do you mean by the term "continuous reinforcement". Is this a technical term. Do you have a reference for the 0.7% reinforcing ratio or are you just basing this on the chart in ACI350R
I have a 12" thick slab with #5 @12" o.c top and bottom. I want the steel to be continuous through the control joints (and construction joints). I read somewhere that the control joint should be cut to a depth of 1/3 the slab thickness. If I have top steel with 2" of cover, they will not be...
Jed I went to the SNWA web site, but wasn't able to find this design standard. Do you have a link to this standard?
When you refer to sloped side walls, is this a 1 vertical in 5 horizontal slope to a thickened slab edge. Does this also occur at the interior column pads too? I'm not quite...
Thank-you JedClampett and JAE
Jed, out of curiosity what did you use for a base slab thickness and reinforcing for your tank and how did you deal with the control joints there.
On another thank that I am doing, I would like to use a 10" slab on grade with 1 layer of reinforcing centered so...
