This set of Civil Engineering Drawing MCQs focuses on “Analysis of Rates of Cement Concrete”.
1. Which type of machine does the figure below represents?
b) Water tank
c) Electric Cement Mixer
d) Harvesting machine
Explanation: The Pro-Series 4 Cubic-Feet Electric Cement Mixer is the ideal size for mixing concrete for small to medium size projects around the house. This general duty Cement Mixer handles drywall mud, plaster, stucco, mortar, concrete and more. You could even use it on the farm to mix cattle feed or treat seeds before planting.
2. The concrete solidifies and hardens through a chemical process called hydration.
Explanation: To produce concrete from most cements (excluding asphalt), water is mixed with the dry powder and aggregate, which produces a semi-liquid slurry that can be shaped, typically by pouring it into a form. The concrete solidifies and hardens through a chemical process called hydration. The water reacts with the cement, which bonds the other components together, creating a robust stone-like material.
3. Reinforcement is often included in concrete.
Explanation: Concrete can be formulated with high compressive strength, but always has lower tensile strength. For this reason it is usually reinforced with materials that are strong in tension, typically steel rebar.
4. Mortar is composed of cement and sand, and concrete is composed of cement, sand, and gravel.
Explanation: Cement is the binding element in both concrete and mortar. It is made most commonly of limestone, clay, shells, silica sand and other materials.
Concrete is composed of cement, sand, and gravel or other fine and coarse aggregate. The addition of water activates the cement, which is the element responsible for binding the mix together to form one solid object.
Mortar is composed of cement and sand. When water is mixed in with this product, the cement is activated. Whereas concrete can stand alone, mortar is used to hold together bricks, stones or other such hardscape components.
5. Concrete solidifies due to a chemical reaction known as hydration. The water reacts with the cement, which bonds the other components together, eventually creating a strong stone-like material.
Explanation: Concrete is used more than any other man-made material in the world. As of 2006, about 7.5 billion cubic meters of concrete are made each year—more than one cubic meter for every person on Earth. The ingredients are mixed together into a paste, a bit like making dough for bread. The concrete is then poured into a frame. After a few hours it sets hard.
6. Concrete is strong in tension but weak in compression.
Explanation: Concrete is strong in compression but weak in tension. For some purposes it needs to be reinforced with steel rods. Reinforced concrete buildings can be made to link all the parts together, the foundations, walls, floors and roofs, but concrete construction does not make buildings earthquake-proof.
7. ‘Superplasticizers’ are chemicals which improve workability, which means the ability to shape the concrete before it has set.
Explanation: Pigments can change the dull grey colour. Corrosion inhibitors can reduce rusting on the steel bars. ‘Air entrainment’ is blowing little bubbles in the concrete before it sets. This helps the concrete survive the freezing and thawing of a cold climate. Blast furnace slag can be mixed with concrete. It turns the colour into almost pure white and makes the concrete stronger.
8. The quantity of cement concrete may be calculated by multiplying the area of floor by the thickness.
Explanation: The quantity of cement concrete calculated by multiplying the area of floor by the thickness.
9. For frog filling, for use of cut bricks, for bonding, for uniform joints, wastages, etc. 50% extra mortar may be required.
Explanation: For frog filling, for use of cut bricks, for bonding, for uniform joints, wastages, etc. 15% extra mortar may be required.
10. For 2.5 cm thick c.c. floor of 1:2:4 proportion, for 100 sq m, how many cement bags will be required?
Explanation: 100 sq m total dry volume of materials = 2.75+50% = 2.75+1.375 = 4.125 cu m. Therefore, cement = (4.125) / (1+2+4) = .59 cu m = .60 cu m (18 bags). For neat cement surface finishing additional 0.2 cu m (6 bags) of cement will be required.
11. For 2.5 cm thick c.c. floor of 1:2:4 proportion, for 100 sq m, what amount of stone aggregate will be required?
a) 5.20 cu m
b) 1.20 cu m
c) 2.40 cu m
d) .20 cu m
Explanation: Stone aggregate = 0.6*4 = 2.40 cu m.
12. For coloured cement floor, mix pigment colour with neat surface cement in the proportion of ______ to ______ is to have desired colour.
a) 1:3 to 1:6
b) 1:3 to 1:6
c) 1:3 to 1:6
d) 1:3 to 1:6
Explanation: White cement mixed with colour pigment of the desired proportion may also be used, but for strength it is better if ordinary Portland cement is mixed with white cement in the proportion of 1:1 to 1:3 and then to add colour pigment to have the desired colour.
13. For 10 cu m brickwork in 1:6 cement mortar, calculate the quantity of cement?
a) 0.20 cu m
b) 0.13 cu m
c) 0.56 cu m
d) 0.43 cu m
Explanation: Divide 3 by the sum of the numerals of the proportion of materials which gives the quantity of cement in cu m. For brickwork in 1:6 cement mortar cement = 3/(1+6) = 0.43 cu m.
14. For 2.5 cm c.c. floor for 100 sq m of area and 10% for contingency what amount of cement concrete will be required?
a) 5.75 cu m
b) 2.75 cu m
c) 2.5 cu m
d) 5.0 cu m
Explanation: For 2.5 cm c.c. floor for 100 sq m of area the quantity of cement concrete = 100*.025 = 2.5 cu m. Adding 10% extra for unevenness of base concrete, the quantity comes to 2.5+.25 = 2.75 cu m.
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