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 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...
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...
Question: Where should construction joints be located in a two-way slab?
I am involved in the construction of an underground tank with a two-way concrete roof slab. The column spacing is about 22.5 and the tank is 270' x 90'. I have been asked by the contractor where he should locate the...
Can anyone tell me if they have had experience with using precast plank for an underground tank. This particular tank is 70 ft square. The interior columns are going to be 17-6" apart. The tank has about 5 1/2 feet of soil over the top.
I find that if you are going to design the tank to be...
Does any know, at a slab on grade, how much a vapor barrier above or below the sand cushion affects the coefficient of (sliding) friction between the bottom of the slab and the soil. I would assume it would be detrimental.
To make a long story short, I have a block foundation wall which has...
