(9) Which of the following items can be used as supplementary cementitious mater
ID: 1733015 • Letter: #
Question
(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) Supplementary cementing materials contribute to the properties of hardened concrete through pozzolanic activity. These are often added to concrete to make c mixtures more economical, reduce permeability, increase strength. Some of the examples of supplementary cementing materials are silica fumes,fly ash etc
Hence option D is correct
10) When aluminate cement comes into the contact of sulfate then concrete deteriorate and this reduces the durabiltiy of concrete.
Hence option C is correct.
11) The common PG asphalt binders are PG 58-22, PG 64-10, PG 64-16, PG 64-28, and PG 70-10.
Hence option B is correct.
12) ASTM C496 is used to determin the splitting tensile strength of concrete, whereas ASTM C78 is used to determine the flexure strength of concrete.ASTM C78 is indirect test used to determine the tensile strength of concrete based on bending.
Hence opton B is correct.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.