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When I did the numbers acording to the ACI (american concrete institute)the span between control joints is figured it. My slab is 20 feet by 30 feet with water tubes imbedded for heating. Since it is difficuld to run piping through the joints, I eliminated them in the design which made the...

Mike, <br> I have not done any experiments like that yet. The system is not "on line" yet. I am still building the house over it. I Once it is piped I will be able to do such testing. The media is a known quantity. It is mostly basalt. The particle size ranges from 3/4" to dust. It was compacted...

I just installed storage cells under my house using quarry fill with water circulation tubes. 3 separate insulated containers totaling about 80 tons. If I could heat them up to 110 deg F and deplete the temperature to 90, assume a 30 deg F. delta T, how many BTU's could I get out and at what...

I called the supplier, which is a large local supplier and to my surprise, they told me that it was grade 40. Its in the slab as of yesterday, so its too late. One good thing though, I oversized by a lot. I used 3/4" bars 12" O.C.

WHat will Fibermesh do the modulus of rupture in a slab (MOR) ?<br> I am designing a 6" slab with steel reinforcement. If the MOR is higher then I don't need as much steel. An ACI book states that the MOR for a plain 3,000 PSI slab is 493. How much will Fibermesh increase that ?<br> Thanks, <br>...

I am designing a slab on grade and need a design number for allowable stress in steel rebar. I used 30,000 PSI and the amount of steel the equasion came up with seems too high. If I allow more stress, I can reduce the steel a bit. <br> Thanks, <br> Bill<br>