27. Late wood is the dark colored ring which grows in the summer and is composed

Question

27. Late wood is the dark colored ring which grows in the summer and is composed of thick-walled cells and is the stronger but more dense portion of the expressed as a percentage of the oven dry weight of the wood. compressive strength in the same direction. wood 28· The moisture content of a wood specimen is the weight of water in the specimen 29. Tensile strength of wood in the longitudinal direction is greater than the 30. Tensile strength of wood parallel to the grain is 20x greater than perpendicular 31· The process that prevents aluminum from corroding is known as Vibration of concrete is advantageous in the following ways: (Circle the statement which is not true.) a. reduces trapped air and allows consolidation of aggregates and cement b. enhances workability c. reduces the time for curing d. enhances hydration and improves strength of concrete 32. 33. The water-cement ratio influences the following: (Circle the correct answer.) a. concrete strength c. permeability e workability b durability d. hydration f all of the above What admixture is commonly used to the concrete mix to increase its resistance to freeze- thaw cycles? 34. Silt and dissolved chlorides in mixing water will generally alter the properties of reinforced concrete by increasing shrinkage and increasing corrosion. 35. 36. Materials that do not undergo plastic deformation prior to failure are said to 37. Increasing the grain size, increases the strength of the material. 38. In the annealing process, metal is heated to break down the structural grain be "brittle." boundaries and then cooled. Slow cooling results in small grains and reduced strength of the material. 39. One hundred pounds of loose gravel with a specific gravity of 2.68 fills a 1 ft box, therefore, the volume of voids is almost 60%.

Explanation / Answer

27. True. It grows in summer and grows slower and thickwalled xylem cells and denser.

28. True. Mosture content is weight of water divided by dry weight of wood.

29. True. Tensile strength of wood is more than compressive strength in longitudinal direction.

30.Tru. It is usually (10-20)% greater than strenth perpendicular to grain..

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