Concrete Technology and Design

211. The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as

1. Low-heat Portland cement
2. Rapid hardening Portland cement
3. Portland blast slag cement
4. Portland pozzolana cement

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212. The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of

1. 0.367 x_u
2. 0.416 x_u
3. 0.446 x_u
4. 0.573 x_u
   Where x_u is the depth of neutral axis at the limit state of collapse

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213. The commercial name of white and coloured cement in India, is

1. Colorcrete
2. Silvicrete
3. Snowcem
4. All the above

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214. The commonly used material in the manufacture of cement is

1. Sand stone
2. Slate
3. Lime stone
4. Graphite

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215. The compaction of concrete, improves

1. Density
2. Strength
3. Durability
4. All the above

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216. The compressive strength of 100 mm cube as compared to 150 mm cube is always

1. Less
2. More
3. Equal
4. None of the above

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217. The concrete mix which causes difficulty in obtaining a smooth finish, possess

1. Segregation
2. Internal friction
3. Hardness
4. Bleeding

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218. The condition not applicable to water cement ratio law, is

1. Internal moisture conditions on hydration continue till complete strength is gained
2. Concrete specimens may be tested at any temperature
3. Concrete specimens need be of same age
4. Concrete specimens need be of same size

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219. The critical section for finding maximum bending moment for footing under masonry wall is located

1. At the middle of the wall
2. At the edge of the wall
3. Halfway between the middle and edge of the wall
4. At a distance equal to effective depth of footing from the edge of the wall

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220. The datum temperature for maturity by Plowman, is

1. 23°C
2. 0°
3. - 5.6°C
4. - 11.7°C

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