Concrete

Type: Fine-grain concrete Ingredients: Cement, water, small stones Strengths: Cheap, fireproof and weatherproof, molds to any shape, strong in compression Weaknesses: Cracks with temperature changes, weak in tension Early arch bridges and domes Example: Pantheon - Rome, Italy You had to squeeze this concrete block really hard to make it break. That's because concrete is very strong in compression. You pulled apart the small stones and cement in this concrete block easily. That's because concrete is weak in tension.
 * CONCRETE **
 * // Properties //**
 * // Pros+Cons //**
 * // Applications //**
 * // Compression Message //**
 * // Tension Message //**

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 * ** Concrete Quiz Answers ** ||
 * **Find out how much you know about concrete**

> Look at this illustrated history of concrete //Click on the back button to come back to this page// 2. Check all the possible components of concrete 3. What is the purpose of cement in concrete? The purpose of cement in concrete is the long duration of structures, today still exist structures built with this mixture.
 * 1) When was concrete first made?
 * || 9000 BC ||
 * x || 3000 BC ||
 * || 100 AD ||
 * || 1756 ||
 * || 1824 ||
 * x || water ||
 * x || cement ||
 * x || gravel ||
 * x || sand ||
 * || air ||
 * || steel ||
 * || rods ||

4. What role does water play in producing concrete? The water makes concrete liquid, so it’s easy for the workers to build with concrete. Concrete can last 50,000 years
 * 1) Is concrete stronger in compression, tension, or the same in either? Check out this lab to find the answer.
 * x || It is stronger in compression ||
 * || It is stronger in tension ||
 * || It is the same in either ||

· ** Reinforced concrete ** · ** Pre-cast concrete ** · ** Prestressed concrete ** · ** Concrete-shell ** · ** Tiltwall construction, tilt-up panel construction and pre-cast concrete construction ** Tilt-up and tiltwall are two terms used to describe the same process. For a tilt-up concrete building, the walls are created by assembling forms and pouring large slabs of concrete called panels directly at the job site. The panels are then tilted up into position around the building's slab. Because the concrete tiltwall forms are assembled and poured directly at the job site, no transportation of panels is required. One major benefit of this is that the size of the panels is limited only by the needs of the building and the strength of the concrete panels themselves. Tiltwall panels can sometimes be extremely wide and/or tall. Tilt-up panel have been measured at just over 69 feet across and almost 93 feet from top to bottom. Thus, architects and tilt-up concrete contractors have a great deal of flexibility in planning and creating their buildings. The precast concrete building process is similar to tilt-up construction, but it addresses the challenges presented by weather. For precast concrete buildings, work crews do not set up forms at the job site to create the panels. Instead, workers pre cast concrete panels at a large manufacturing facility. Because the precast concrete forms are poured indoors, this activity can take place regardless the weather conditions. After curing, the precast concrete panels are trucked to the job site. From this point, precast concrete buildings are assembled in much the same manner as tiltwall buildings.
 * x || True ||
 * || False ||
 * //__ Concrete __//** is a manufactured mixture of cement and water, with aggregates of sand and stones, which hardens rapidly by chemical combination to a stonelike, water-and-fire-resisting solid of great compressive but low tensile strength.

** Conclusion ** Concrete is relatively cheap and durable and can be molded to any shape. It can be made porous or watertight, heavy or light, and will even harden under water. These and other variable characteristics of concrete make it ideal for many uses. Concrete’s workers used this material in liquid, so concrete can be liquid or solid, that’s why concrete is a popular material of construction. It’s used for vehicular and people ways, stairs, chimneys, and buildings due to its durability, strength and hardness. It’s also a material used for public and private spaces, because courtyards and squares are constructed with concrete.