(15) Freeze/thaw damage of concrete can be mitigated through? A. limiting the ma
ID: 1866466 • Letter: #
Question
(15) Freeze/thaw damage of concrete can be mitigated through? A. limiting the magnitude of temperature change by using phase change materials; B. reducing the residual water in concrete; C. entraining air bubbles; D. all of above; E. (B&C;). (1o) Type IV cement may be selected when you design a A. underground sewage pipeline; C. rapid repair work for highway in MO during November; D. pre-cast bridge girder. B. a 1.5 m thick concrete slab; (17) Which of the following approaches can protect steel reinforcement from corrosion in Hawaii? A. Electrochemical Cl extraction; B. Electrochemical re-alkalization C. Increase concrete cover thickness D. Use epoxy coated rebar; E. All of above; F. (B, C, & D) (18) Which of the following descriptions about steel is incorrect A. the higher the carbon content, the higher the steel strength and hardness; B. the higher the carbon content, the higher the steel toughness; C. phosphorus can increase the corrosion resistance of steel; D. None of above. (19) Grout in masonry work A. plays the same role as mortar; B. is normally weaker than mortar C. has to be used with steel reinforcement D. can be placed in cores of bricks to increase load-bearing capacity of a masonry wall. (20) What is the major deterioration mechanism of wood as a construction material? [ A. Abrasion; B. Freeze/thaw cycle; C. Fungi/insects induced bio-degradation; D. Chemical attack.Explanation / Answer
Answer 15- (C)-entraining air bubbles
Answer 16- (D)-pre-cast bridge girder
Answer 17- (F)- B,C & D
Answer 18- (C)-phosphorus can increse corrosion resistance of steel
Answer 19- (D)- can be placed in cores of bricks to increse load bearing capasity of a masonary wall
Answer 20- (C)-fungi/insects induced bio-degradation
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