Frequently Asked Questions

At Maddox Concrete Company, Inc., we look forward to supplying your concrete to complete your projects.  Here are a few of our most recently asked questions.

In What Quantity Is Concrete Sold?

Concrete is sold by the cubic yard.  One cubic yard contains 27 cubic feet — an area 3' high, 3' wide, and 3' long.  A cubic yard of concrete weighs approximately 4,000 lbs.

How Soon Can I Use My New Sidewalk, Patio, Driveway?

Concrete curing times vary depending on temperature, humidity, etc.  At 70 degrees, 3,000 PSI concrete will be hard after 24 hours, but the surface will still be soft enough to be scuffed or marked if you are not careful.  The concrete will be at least 75% of its specified strength in 7 days.  It will be full strength in 28 days.  We recommend, at a minimum, of not driving on any new concrete for at least 7 days.

What Happens in Cold Weather with Concrete?

When temperatures are below 40 degrees, the chemical reaction, known as setting or curing, does not take place.  The solution is to start with warm, heated materials, add an accelerator, add hot water, and to protect the newly poured concrete with insulated concrete blankets.  Never pour concrete on frozen ground.

Our trucks are very versatile and can make many different mix designs, slumps, etc., by simply changing the dial settings at the jobsite.  Please let us know if you have any special requests when you place your order.

Contact us in Wilmington, Delaware, to learn more about our concrete company.