You cannot estimate the relative humidity within the concrete from the relative humidity of the air. It can be tested using a specific procedure and special equipment built for that purpose. Read ASTM F2170 quotStandard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probesquot.
Reinforced concrete pipe is a strong pipe with the ability to resist most any loads. It is used for culverts storm drains and similar projects The compressive strength for concrete generally ranges from 4000 pounds per square inch psi to 8000 psi. Concrete pipes do not require the same amount of
A column should have minimum section 200250 sq if it is not an obligatory size column. 6. In addition all columns shall be designed for minimum eccentricity equal to subject to minimum eccentricity of 20mm.
Rebar supports and spacers are used to secure the reinforcing steel or rebar in reinforced concrete structures. Prior to the final concrete pour the rebar is assembled inplace with the rebar chairs slab bolsters or wagon wheels. How to Select