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East Tennessee Commercial, Industrial and Residential Concrete Solutions
 

Frequently Asked Questions

Q: What information do I need to give the dispatcher when placing a concrete order?

A: We need to know what you are pouring, the strength concrete you require in pounds per square inch or at least what type of load the concrete will bear, the location of the pour, and the slump of the concrete desired on delivery (that is how dry or wet the finisher wants the load. Typically we recommend between a 4 to 5 inch slump for most applications.

Q: How do I figure how much concrete I will need?

A: See our concrete calculator link for instructions.

Q: I've heard that people put air in concrete. When should I use air entrainment in the concrete?

A: Air Entrainment is used to protect concrete that will be exposed to the weather, namely protection from the winter freeze/thaw cycles. Air Entrainment allows the concrete to expand and contract very slightly to help prevent the concrete from cracking during freeze/thaw. Air Entrainment is not suggested for interior slabs of for concrete that will be protected from the elements.

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Q: I have a crack in my concrete. What causes concrete to crack?

A: All concrete, regardless of producer, is guaranteed to do two things: 1. Get hard and 2. Crack.

Concrete, like other construction materials, contracts and expands with changes in moisture and temperature, and deflects depending on load and support conditions. Cracks can occur when provisions to accomodate these movements are not made in design and construction. Most cracks that appear at an early age, although unsightly, rarely affect the structural integrity or the service life of the concrete.

You should use the following rules to minimize cracking:

  1. Design the members to handle all anticipated loads
  2. Provide proper contraction and isolation joints (saw, forming, or tooled joints: depth 1/4 to 1/3 the thickness of the slab with a spacing between 24 to 36 times the thickness. A maximum 15 feet spacing for contraction joints is often recommended.)
  3. In slab on grade work, prepare a stable subgrade
  4. Place and finish according to recommended and established practices
  5. Protect and cure the concrete properly.

Q: Should I use Synthetic Fibers in my concrete?

A: It is up to you, but it is a good investment. Synthetic Fibers are used to reduce settlement cracks, reduce plastic shrinkage cracks, reduce the permeability, increase impact and abrasion resistance, adds internal support and cohesiveness (steep inclines, shotcrete, and slipformed placements), and provides a degree of shatter resistance.

     
 
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Bradley Concrete/Lambcon, Inc. Corporate Offices
Office Main: 423.479.4541 • Fax: 423.479.4542

Residential • Commercial • Industrial

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