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I’ve been producing concrete for more than 30 years at my company’s batch plant in Iowa. By now, I know just about what to expect from any mix my plant produces. If you know what you want to accomplish, I can tell you which concrete mix is appropriate. Concrete in general is a pretty simple material, with just four main ingredients: cement, water, sand, and stone. Those elements mostly determine its characteristics. But most concrete also contains a variety of admixtures, which have an important effect on the results. For best results, you should use admixtures where they’re appropriate. It’s important to understand all their effects because they can change the way concrete behaves. You may have to adjust your concreting