Frequently Asked Questions
Most simply, cement is an ingredient of concrete. Concrete is a mixture of aggregates (sand, gravel or crushed stone) and paste (water and portland cement). When cement, water and aggregates come into contact, the mixture binds together and hardens into a rocklike mass through a process is called hydration.
Curing ensures that the desired properties of the concrete are achieved by maintaining the correct moisture content and temperature profile in the concrete, typically over a five to seven day period.
All concrete cracks. Concrete, like other materials, changes slightly in volume when it dries. The typical amount of change is about 1/16th of an inch in 10 feet. Temperature changes also cause concrete to expand and contract over its lifetime, leading to cracks. Contractors include joints in concrete pavements and floors to allow the concrete to crack in a straight line at the joint when the volume of the concrete changes due to shrinkage or temperature.
We would be happy to help you determine the amount of concrete needed for your job. Concrete is measured by the cubic yard. You can use the Concrete Calculator to learn how much you will need by multiplying length, by width, by depth and dividing by 27 (the number of cubic feet in a cubic yard). We recommend adding 10 percent to allow for spillage and variations in slab depth. Or, give us a call, and we can make sure you have the right amount and the right mix for the job.
Air-entrained concrete contains billions of tiny air cells per cubic foot produced by using air-entraining portland cement or by adding air-entraining chemicals as the concrete is mixed. These agents create concrete that is highly durable and has increased protection from cycles of wetting, freezing and thawing.
Yes! We carry pigment for concrete which is available in a variety of colors. Color for concrete is not a dye, stain or paint, but comes in powder, liquid and granular forms and is added to the concrete as it is mixed. Contact us to create the perfect color for your application.
Chemical admixtures are the ingredients in concrete other than portland cement, water and aggregate that are used to improve the behavior of concrete under a variety of conditions.
Aggregate is a broad category of coarse particulate material such as sand, gravel, or crushed stone that, along with water and portland cement, is an essential ingredient in concrete. Aggregates vary in many qualities such as size, dimension and surface quality. Choosing the correct aggregates for each application gives concrete the strength, workability and durability desired.