A bar, 20 mm diameter and fixed at A, is stretched with a force of 10 kN to bring to support B and fix it. Length AB is 2 m. Temperature is 27°C. Take E = 200 GPa and a = 12 x 105/ C. Steel 200 10 kN 2 m 13.74 C 36.64 C 40.25°C 35.78°C

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Types of Cement

Cement is a fine mixture of limestone, chalk, or marl and clay which when mixed with water, becomes compacted due to the formation of strong molecular bonds. Due to hydration, cement turns into a hard mass when left for a sufficient amount of time upon mixing with water. The water turns the cement compounds into gel-like submicroscopic particles having higher surface areas. It is due to the hydration properties of cement, they are often known as hydraulic cement. For instance, Portland cement is a popular example in this category.