(7) Which standa rd can be used to estimate the tensile strength of concrete bas
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(7) Which standa rd can be used to estimate the tensile strength of concrete based on an indirect splitting method? A. ASTM C496; C. ASTM C39; B. ASTM C78; D. All of above; E. (A&B;) (8) It is known that the compressive strength of a conerete is 40 MPa. In a tri-axial compression test, a constant lateral pressure of 15 MPa is applied on a cylindrical specimen prepared with this concrete. Estimate the result of this tri-axial test A. 40 MPa; C. 90 MPa; B. 75 MPa; D. >100 MPa. (9) Diffusion of chloride ions in concrete cover towards steel reinforcements A. affets the service life of concrete structure in marine environments; B. is driven by chloride concentration gradient, the same as the driven force of permeation; C. can be retarded by making concrete denser; E. (A&B;) F. (A&C;); G. (B&C;). D. All of above; (10) Drying shrinkage A. is caused by moisture migration; B. doesn't occur when the concrete is cured at 295% rh; C. could cause tensile stress in the surface layer of concrete; D. All of above; E. (A&B;) F. (A&C;) (11) What is the Achilles' heel of reinforced concrete structure A. Steel reinforcement that can be corroded in air B. Capillary pores (and micro-cracks) throug C. Reactive aggregate that can react with alkali to form expansible gel; D. Steel reinforced concrete is a perfect design without Achilles' heel. h which matters can migrate (12) Which of the following approaches can protect steel reinforcement from corrosion in Missouri? A. Electrochemical Cl extraction; B. Electrochemical re-alkalization C. Increase concrete cover thickness; D. Use epoxy coated rebar E. All of above; F. (C&D;).Explanation / Answer
7.
ASTM C496 standard is used to estimate the tensile strength of concrete based on an indirect splitting method.
Therefore, the correct option is A.
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