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 the wood of thick-walled cells and is the stronger but more dense portion of expressed as a percentage of the oven dry weight of the wood. Tensile strength of wood in the longitudinal direction is greater than the 28. The moisture content of a wood specimen is the weight of water in the specimen 29. compressive strength in the same direction. 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 32. Vibration of concrete is advantageous in the following ways: (Circle the statement which is nos true.) a rmbenes tmpeal air und allows comsolidation of agrgates and cement b. enhances workability c. reduces the time for curing d enhances hydration and improves strength of concret 33. The water-cement ratio influences the following: (Cirele the correet answer.) a. concrete strength e. 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. 35. Silt and dissolved chlorides in mixing water will generally alter the properties of reinforced concrete by increasing shrinkage and increasing corrosion. Materials that do not undergo plastic deformation prior to failure are said to be "brittle." 36. 7. Increasing the grain size, increases the strength of the material. 38. In the annealing process, metal is heated to break down the structural grain boundaries and then cooled. Slow cooling results in small grains and reduced 39. One hundred pounds of loose gravel with a specific gravity of 2.68 fills a 1 ft box, Ihereby certify with my signature that I have completed this Final Exam in CAEE 330 without help from anyone, strength of the material. therefore, the volume of voids is almost 60%. ve not conferred with anyone and I have complied with all spects of the NC A&T; State University Academic honesty Policy

Explanation / Answer

27) True. Late wood grows in summer and dark coloured, thich walled and more denser.

28) True. moisture content = weight of water / weight of dry weight.

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

30) True. It is nearly 10-20 % more than in perpendicular direction.

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