Why Do Concrete Slabs Crack & Deteriorate?


I was surprised to find substantial slab cracking and moisture issues on a concrete slab that was located on a very prestigious new construction project in downtown St. Petersburg, Florida.  I have to wonder how long this issue will exist until someone starts to question who is responsible for such initial cracking, and obvious water invasion of this surface.  

St. Petersburg, Florida is not a difficult area of the country to properly place concrete slabs and paving.  There is NO FROST and NO FREEZING, therefore, unlike New England you are not subjected to temperature differentials that range from extremely hot, to extremely cold.  

I have to say that I was amazed at the extent of slab cracking and the obvious deterioration of the concrete surfaces on the new pier in St. Petersburg.  This is a very recent construction project and why the slabs are cracking and deteriorating as these photos show is interesting and certainly suspect..   

There could be several issues and circumstances that led to this issue. 

  1. Were the construction joints, expansion joints properly constructed and were the proper dimensional requirements met?  
  2. Did the concrete mix properly address the extreme heat that these slabs would be subjected to. 
  3. Did the concret mix properly address the exposure of these slabs over the span of the waterway that is below the slab. 
  4. Did the proper construction quality process take place when these slabs were placed?  Issues such as slump, proper admixtures, timing of the placement of the slab, etc.? 
  5. Was the supporting structural structure adequate to prevent the flexing of the slabs and the proper support of the concrete slabs?  

I have placed thousands of square feet of concrete slabs in the Northeast without the result of these types of cracks and issues with the slab?? I have to wonder?

 

 

 

 

 

 

 

 

 

 

 

 

 

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