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A concrete mixture ratio of 1 part cement, 3 parts sand, and 3 parts aggregate will produce a concrete mix of approximately 3000 psi. Mixing water with the cement, sand, and stone will form a paste that will bind the materials together until the mix hardens.
What Is Dry Mix Concrete. To understand what dry mix concrete actually is, you need to know what it is made of. Concrete is a mixture of cement, different types of aggregate material, and water that when mixed together will harden into any shape that you want. This is commonly what is used on sidewalks, driveways, and is also used in the creation of precast materials for the structure of large buildings that you see today.