Riverina Water is constructing two 11ML water supply reservoirs (post tensioned).
Compressive test results indicate that an out of spec load was placed in the 260m3 floor pour.
The results indicate that the 6m3 out of spec concrete will reach 20-25MPa rather than 40MPa. The same mix typically achieves 48-53 MPa.
The floor area with out of spec concrete has been identified using concrete test hammer. It is located in the ring beam and has a number of anchorages in it.
After consultation with the design firm, the contractor is proposing to delay full stressing of the slab until the concrete out of spec concrete reaches its 28 days 40 MPa.
We are concerned about the effect that low strength concrete will have on durability/ long term performance of the structure.
Has anyone had a similar experience? What was the outcome?
Can you please contact us to provide details.
Anjanee Bichani Project Engineer - NetworksRiverina Water County Council
Mobile: 0437 217 509 Direct: 02 6922 0627
T: 1300 416 745