R402.2.1

Section R402.2.1 is titled 'Materials for concrete' and covers the requirements for materials allowed to be used in making concrete. A cross-reference to another section of the code which provides details about concrete materials is established. The purpose of this section is to prevent structural failure and prevent premature degradation of concrete.

The model shows a pile of course aggregate, fine aggregate, and cement, which along with water, are the key materials used in making concrete.