Concrete specimens mostly refer to concrete compressive strength test blocks, flexural strength test blocks, impermeability test blocks, and freeze-thaw resistant test blocks.
The unqualified test piece refers to the situation where the indicator value of the test piece that has reached the curing age does not reach 100% of the design value.
This type of nonconformity includes two aspects: the nonconformity of the specimens retained by the concrete supplier and the nonconformity of the specimens retained by the concrete user.
Once the test piece fails, it cannot be immediately determined that the concrete is unqualified.
A comprehensive investigation should be conducted to find the root cause.
Analyze possible influencing factors and eliminate them one by one.
The following factors should be considered:.