(1) If a concrete mixer transport truck (cement mixer) is stuck in a traffic jam
ID: 1732498 • Letter: #
Question
(1) If a concrete mixer transport truck (cement mixer) is stuck in a traffic jam, which of the window o ollowing materials can be used as a setting retarder to prolong the workable win concrete in the mixer? A. Sea salt C. Na2COs D. Diet Pepsi B. Regular Coke (2) Standards ASTM C403 and ASTM C191 A. test the same parameter of concrete; B. were both designed based on penetration resistance of fresh mixtures; C. use the same apparatus; D. All above descriptions are wrong. (3) Which of the following descriptions of concrete is obviously incorrect? A. Concrete can withstand water without serious deterioration, but its strength will stop increasing when submerged in water B. Many kinds of solid wastes can be consumed as raw materials to make concrete C. The price of concrete is normally lower than that of cement (both in S/metric ton); D. The thermal expansion coefficients of concrete and steel are similar to each other. (4) Which of the following materials can be used for the purpose of curing? B. Evaporation reducer A. Wettable mats; C. Recycled super absorbent polymer particles from used baby diapers; D. Lightweight sand produced by crushing calcined perlite; E. All of above; G. (B&C;) F. (BCD) Which of the following techniques can improve concrete against the limitations of this widely used construction material? B. Fiber-reinforced concrete A. 3D printing C. Pre-stressed concrete; D. All of above; E. (BC). (6) How does water content affect the workability of concrete A. More water means better workability B. Higher w/c means better workability; D. More water normally result in better flowability but higher risk of bleeding A. increase flowability when cement content and w/c are kept constant; gher wic means better workability; (7) Superplasticizer can be used to B. increase cohesiveness of fresh concrete when w/c is kept constant;Explanation / Answer
(1) Answer:- (B) Diet coke
(2)Answer:- (A) test the same parameters
(3) Answer:- (A) Concrete can withstand water without serious deterioration , but its strength will stop increasing when submerged in water.
(4) Answer:- (A) Wettable mats
(5) Answer:- (A) 3D printing
(6) Answer:- (D) More water normally result in better flowability but higher risk of bleeding.
(7) Answer:- (A) Increase flowability when cement content and W/C are kept constant.
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