Gypsum is a very soft mineral (Figure 2) and the main component in drywall (also called sheetrock and wallboard).  Drywall is used extensively in the interior of modern homes and businesses.  During construction, sheets of drywall are normally cut into smaller pieces and then nailed to a building's wood or metal framing to form walls and ceilings.  Explain how gypsum's softness makes it ideal for this type of application.

what are the different types of resin cements in dentistry and their indications

(a) In general, which provides better fire performance, carbonate or silicate aggregates? Why? (b) Why does fire design incorporate a load reduction factor (Dfire) = 1.0? (c) Two identical beams (Beam 1 is simply supported, and Beam 2 is fully restrained) are heated under similar conditions. What does the mechanical strain equal to in each of these beams? (d) A design office located in Clemson, SC (with a branch in San Francisco, CA) envisions designing a new composite member made of steel and timber. This to-be designed member is expected to be used in wildfire-prone regions primarily for single family homes. Comment on how you would design such a member to achieve superior fire performance. (e) Plot and discuss the expected degradation faces in three bending elements (say, beams) to be made from concrete, steel and timber?

Reinforcing steel inside concrete is protected by the passive layer that forms due to the high pH environment inside concrete.  This passive layer can be broken down by two main mechanisms.  Please select both: A.use of a corrosion inhibiting chemical admixture B.ingress of chlorides from deicing chemicals C.use of supplementary cementitious materials D.carbon dioxide (CO2) entering the concrete from the atmosphere E.a low w/cm

Briefly discuss four heat treatment methods to enhance the properties of steel. What are the advantages of each treatment?

Concretes have several properties. Which one of the following statements is incorrect? a. Concretes have good tensile strength b. Concretes have good shear strength c. Concretes have good compressive strength d. Concretes have good wear resistance