(9) Which of the following items can be used as supplementary cementitious mater
ID: 1866467 • Letter: #
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(9) Which of the following items can be used as supplementary cementitious materials? [ A. Fly ash; B. Limestone powder C. Silica fume D. All of above. (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;) (13) 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: A. 125 MPa; C. 90 MPa; B. 130 MPa; D. may >150 MPa. ] is to steel reinforced concrete just like the poisonous arrow is to Achilles B. Aggregate; A. Capillary pores (and micro-cracks); C. Chloride ions and other erosive matters in the service environment; D. Steel reinforcements.Explanation / Answer
9.(D)
Supplementary cementing materials (SCMs) contribute to the properties of hardened concrete through hydraulic or pozzolanic activity.
Examples : fly ashes, slag cement and silica fume.
Supplementary cementing materials are often added to concrete to make concrete mixtures more economical, reduce permeability, increase strength, or influence other concrete properties.
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