The reaction between water and cement gives concrete its strength. The important water-to-cement ratio is responsible for the strength of the finished product. Concrete strength is usually measured by its compressive and flexural strength in Pounds per Square Inch (PSI). When you order a “Bag” mix you’re really ordering a specific quantity of cement per cubic yard of concrete. Using some conversion factors you can translate between the two.
It takes time for concrete to achieve its full strength. They say that the innermost concrete poured in the Hoover Dam is still hardening to this day! Often concrete is measured for strength at intervals of 7 days, 14 days, 28 days, and sometimes 56 days. We assume that the 28 day strength test will be an accurate measurement of the final strength of the product.
Your account representative can help you determine what strength of concrete you need. As you can imagine, cement is a costly material in the production of concrete. We tailor specific mixes to specific applications so that you can successfully accomplish the goals of your project in an economical way.