Does this concrete poured really bad??

[Hangster]

100 psi is usually not enough to break concrete, especially one that has cured. How long ago was this poured? The rate of hardening for concrete is an exponential curve with it reaching over 95% strength in about 30 days depending on the mixture ratio.

[allen3iverson]

Originally Posted by Hangster

100 psi is usually not enough to break concrete, especially one that has cured. How long ago was this poured? The rate of hardening for concrete is an exponential curve with it reaching over 95% strength in about 30 days depending on the mixture ratio.

yesterday afternoon, it was poured. I plan to build a cover patio on top of it. So the four post will sit right on the new concrete.

[Hangster]

If you want to break it up, just buy a sledge hammer and pick up a day laborer in front of home depot. The only question is do you have anything to haul it to the dump site? Might just be better to hire someone out to remove it and redo the whole thing for you.

[allen3iverson]

Originally Posted by Hangster

If you want to break it up, just buy a sledge hammer and pick up a day laborer in front of home depot. The only question is do you have anything to haul it to the dump site? Might just be better to hire someone out to remove it and redo the whole thing for you.

If it will not break easy, I may not bother remove it. The only thing I am worried about is the quality, the concrete mix is tagged with 3000 psi strength. Not sure how much it is under such condition.

[Hangster]

concrete strength is in compression. So it should be able to handle 3000psi of compression when fully curred. However, concrete is very week when it comes to sheer forces. Hence it needs re-bar reinforcement to handle sheer. When you hit concrete with a sledgehammer, the area underneath the head of the sledgehammer is under compression, but the area just at the edge of the hammer head is under sheer forces, and it will crack along this edge easily.

[allen3iverson]

Originally Posted by Hangster

concrete strength is in compression. So it should be able to handle 3000psi of compression when fully curred. However, concrete is very week when it comes to sheer forces. Hence it needs re-bar reinforcement to handle sheer. When you hit concrete with a sledgehammer, the area underneath the head of the sledgehammer is under compression, but the area just at the edge of the hammer head is under sheer forces, and it will crack along this edge easily.

The guy told me he put re-bar in it, but not sure if he re-bar into existing concrete, there is no way to check that now.

[TexasDeere]

This was not done by a professional.