(10) All of the following approaches can improve the durability of concrete stru
ID: 1866473 • Letter: #
Question
(10) All of the following approaches can improve the durability of concrete structure, except for: A. Coat the reinforcing steel bars using epoxy or inorganic anti-corrosion coatings; B. Use silica fume in a chloride environment C. Use type III or aluminate cement in a sulfate environment; D. Cover the surface of concrete to prevent moisture ingress. (11) Which of the followings is an asphalt grading? A. PG 46-45; C. PG 120-30; B. PG 64-10; D. PG 65-15. (12) Which standard can be used to test the indirect tensile strength of concrete based on bending test? A. ASTM C496; C. Loading sharing system; B. ASTM C78; D. All of above; E. (A&B;) It is known that the compressive strength of a high-strength concrete is 90 MPa. In a tri- axial compression test, a constant lateral pressure of 10 MPa is applied on a cylindrical specimen prepared with this concrete. Estimate the result of this tri-axial test: (13) A. 125 MPa C. 90 MPa; B. 130 MPa; D. may >150 MPa. (14) [ ] is to steel reinforced concrete just like the poisonous arrow is to Achilles. A. Capillary pores (and micro-cracks); B. Aggregate C. Chloride ions and other erosive matters in the service environment; D. Steel reinforcements.Explanation / Answer
Answer 10- (B)- Use silica fume in chloride environment
Answer 11- (B)-PG 64-10
Answer 12- (C)-loading sharing system
Answer 13- (C)-90 MPa
Answer 14- (C)-chloride ions and other erosive matters in service environment
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