31. The process that prevents aluminum from corroding is known as 32. Vibration

Question

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 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 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 34. What admixture is commonly used to the concrete mix to increase its resistance to freeze- thaw cycles? 35. Silt and dissolved chlorides in mixing water will generally alter the properties of reinforced concrete by increasing shrinkage and increasing corrosion. 36. Materials that do not undergo plastic deformation prior to failure are said to be "brittle." 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 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

31) Aluminium corrosion Resistance (ACR). It prevents aluminium from corrosion.

32) Option C. It will not reduce curing time.

33) Option f is correct. It will effect strength, permeability, durability, hydration and workability.

34) Fly ash is commonly used admixture for resistance to freezing and thawing.

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