What is concrete? Concrete is a composite material widely used in the construction industry. Concrete is basically a mixture of cement, water, aggregates and additives (sometimes). Cement is a fine gray powder composed of oxidizes calcium, silicon and aluminum. The aggregate used is normally gravel, crushed stone or sand. The additive is a solid or liquid substance that gives certain characteristics to the concrete. Cement reacts chemically with water and binds aggregates together through a process called hydration during the hardening or curing of concrete. It means that water helps in hardening the concrete as the cement binds the aggregate and also reacts with the water to form a solid mass. Concrete is one of the most used building materials in the world. The reason for this is that concrete is durable, easy to make, and can be molded into various shapes and sizes. Besides that, concrete is cheap, convenient and easily mixable. Concrete also has its advantages. Concrete does not corrode, so concrete structures require less maintenance. Besides that, concrete has fire resistance, so it is safer than wooden structure. Concrete also has resistance to cyclic loading. Introduction In this report, we will introduce and explain in detail about precast concrete, prestressed concrete, ready-mix concrete, reinforced concrete, terrazzo and urbanite. In this introduction, we will briefly introduce the sub-topic or types of concrete. Reinforced concrete is stronger than basic concrete. Steel reinforcing bars known as rebar are embedded in the concrete structure to act together in resisting the force. Steel reinforcing bars absorb tension and compression because simple conc...... center of paper......concrete: a fundamental approach / Edward G. Nawy. Upper Saddle River, NJ: Pearson Education, 2012.4) Marotta, T. W. (2011). Basic Building Materials / Theodore W. Marotta ... [et al.]. Upper Saddle River, NJ: Pearson/Prentice Hall, 2011.5) Bhatt, P.P. (n.d.). Design of prestressed concrete according to Eurocodes / Prabhakara Bhatt. London; New York: Spon Press, 2011.6) Jester, Thomas C. Twentieth-Century Building Materials: History and Preservation. New York: McGraw-Hill, 1995.7) Fanella, D. (2011). Reinforced concrete structures: analysis and design / David A. Fanella. New York: McGraw-Hill, c2011.8) Levitt, M. M. (2008). Precast concrete: materials, manufacturing, properties and use / M. Levitt. London: Taylor & Francis, 2008.9) Bachmann, H., & Steinle, A. (2011). Precast concrete structures / Hubert Bachmann, Alfred Steinle. Berlin: Ernst & Sohn, c2011.10)