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concrete drive

Posted by Rob Dykeman on August 21st, 1999 08:24 AM
In reply to Driveway by Jack on August 20th, 1999 09:41 PM [Go to top of thread]

It sounds like that the quality control on the project really wasn't what it should have been. There are specific design mixes and techniques that are used for exterior concrete work. But the issue that I get from you is that the base on which the concrete sits is not right. Without the base under the slab all the things that you are describing are going to happen, the cracking, ect. Concrete can be poured on almost anything, stone, sand, clay, fill,ect if the material is consistance 12" or more below the concrete. This is so that when the concrete moves it moves as one and then settles as one. There are many more details needed to know to find out what went wrong with your slab, concrete design mix, did the contractor add water on site and how much, the weather was it cool and damp or hot and sunny, did he use steel trowel to finish, did he seal the concrete when done, how long after he was done if he did. you didn't say where you are located that would be helpful too. If this was done in Jan I assume you are in a warm climate.

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