Question
tay According to recent archacological finding, what composition in ancient Roman concrete is responsible for its long service life in sea water? And in modern concrete technology, w SCM can be added to increase the content of this key component? hich A. C-A-S-H, Slag: B. CA-S-H, Silica fume; C. C-S-H, Slag: D. C-S-H, Silica fume. (9) If you need to design a mass concrete, hydration heat has to be well controlled, otherwise thermal cracking will be induced. What materials can be selected to mitigate risk of thermal cracking? A. Type IV Portland cement; D. Slag; F. All of above; G. (AB) H. (ABC) I. (ABCD) B, Class-F fly ash; C. Class S blended cement; E. Silica fume; (10) Assume that you are building a concrete pavement in New Mexico. What could happen if you don't apply curing to the concrete pavement surface? A. Thermal cracking will appear in the interior of concrete; B. Plastic shrinkage cracking will appear on the surface of concrete C. AAR will be accelerated; D. None of above (11) How old is the world oldest reinforced concrete bridge? So do we have real-world data to validate any service life design method for reinforced concrete bridges? A. 200 years; B. 130 years; C. 100 years During the manufacturing of Portland cement, how much CO2 will be produced when 2.5 metric tons of limestone is calcined to get Ca0? (excluding CO2 from fuel burning) (12) A. 1100 kg; B. 1125 kg; C. 487 kg; D. 1218 kg. (13) In cement chemistry, what CsASHis stands for? (No options, write the formula by yourself) (14) The slump loss of fresh concrete can be accelerated by A. Raining C. Adding NaNO2 B. Higher w/c; D. Higher temperature.
Explanation / Answer
Answer:
8) Option B
9) Option H
10) Option A
11) Option B
12) Option B
13) C3ASH13--calcium alumino-silicate hydrate
14) Option B
15) Option B
16) Option F
17) Option B
18) Option A
19) Option A
20) Option C
