We can judgment standard of rebar joints with the following regulations:

01 Grade I Joint

There are two criteria for judging Grade I Joints:

1) The actual tensile strength of the reinforcing bar connection must be greater than the standard strength of the reinforcing bar material and it should fracture at the reinforcing bar.

2) If the connecting piece does not break the reinforcing bar, the actual tensile strength of the reinforcing bar connection must be greater than 1.1 times the standard tensile strength of the material, reaching at least 594Mpa to be considered qualified. The standard tensile strength value for HRB400 reinforcing bar is 540Mpa.

02 Grade II Joint

The criteria for judging Grade II Joints is that as long as the actual tensile strength value of the reinforcing bar connection exceeds the standard tensile strength value of 540Mpa, regardless of where the connecting piece breaks, it can be considered qualified.

03 Grade III Joint

The criteria for judging Grade III Joints is that as long as the actual tensile strength value of the reinforcing bar connection meets or exceeds 1.25 times the standard yield strength value of the reinforcing bar, which means the actual tensile strength value of the connection reaches above 500Mpa, it is considered qualified. The standard yield strength value for the reinforcing bar is 400Mpa (using HRB400 reinforcing bar as an example here).

Changsha DLADTO Rebar Splice Co., Ltd as a division of ADTO Group. We are a professional rebar joints producer, we have been in this field for a long time with customers for all over the world. You can trust us and take the article when you be required to judge the grade of rebar joints.