Concrete Strength
Concrete Strength
(OP)
I have one project for addition and alteration. The project require to place concrete on top of old concrete. The existing structure was approximately built in 1937. The concrete wall placed has no reinforcement. I tried to take cores from existing structure to check comprssive strength. During coring process the concrete start falling apart in pieces and i noticed 1 to 2mm thick cracks in broken cores
What cause concrete cracks other than age?
Thanks to all in advance
What cause concrete cracks other than age?
Thanks to all in advance






RE: Concrete Strength
ASR is another possibility.
RE: Concrete Strength
Can you post a photo or two of your cores?
RE: Concrete Strength
BA
RE: Concrete Strength
RE: Concrete Strength
gosai....you should get a petrographic examination of the concrete done to determine the probable cause of the problems. You need to know that before you can determine a repair/remediation scheme.
hokie66...I agree, that's the most likely cause. Follows the addage that good concrete is made from aggregates, cement, and water....bad concrete is made of the same stuff.
RE: Concrete Strength
RE: Concrete Strength
RE: Concrete Strength
When used to describe the concrete matrix, it generally means that there are piping voids, usually from water gain and/or lack of consolidation.
RE: Concrete Strength
RE: Concrete Strength
I doubt it was hauled in a transit mixer in 1937 at the time unless it was in a large city.
Dick
Engineer and international traveler interested in construction techniques, problems and proper design.
RE: Concrete Strength
BA