What is 60/70 grade?

 

"60/70 grade" is a term commonly used in construction and engineering to refer to the strength of a material, typically concrete or asphalt. In this context, the "60" refers to the compressive strength of the material in pounds per square inch (psi) after 28 days of curing, while the "70" refers to the tensile strength of the material in psi.

So, a 60/70 grade material would have a compressive strength of 60,000 psi and a tensile strength of 70,000 psi. These values are commonly used as standards to assess the quality of concrete and asphalt and to determine if they are suitable for use in a particular construction project.

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