Is the stress of 4000 MPa a tensile stress or a compressive stress?
You need to look at pressure in the concrete to see how large the pressure is at tthe same location.
If the stress of 4000 MPa is negative, it is from pressure. The magnitude may be reasoanble.
If the stress of 4000 MPa is positive, you need to check the material model to make sure it has failure criteria to limit its maximum tensile stress.
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