This document discusses the production and composition of cement and concrete. It covers the raw materials used to make cement, including limestone, clay, and iron ore. It describes the cement production process and the hydration reaction between cement and water. It also discusses the properties of hardened concrete, including its strength development over time. Additionally, it covers the use of aggregates, reinforcements, and admixtures in concrete. It provides information on air entrainment, sulfate attack, reinforced and prestressed concrete, and testing of concrete strength.