Concrete Technology Set 3

ordinary Portland cement ✘ rapid hardening cement ✘ low heat cement ✘ blast furnace slag cement ✔ white cement ✔

thorough mixing of concrete is required ✘ proper compaction of concrete is required ✘ proper curing of concrete is required ✘ properly graded and non-porous aggregates are requied ✔ all the above ✔

7 kg ✘ 14 kg ✘ 21 kg ✘ 28 kg ✔ 35 kg ✔

The bottom and top ends of slump mould are parallel to each other ✘ The axis of the mould is perpendicular to the end faces ✘ The internal surface of the mould is kept clean and free from set cement ✘ The mould is in the form of a frustum of hexagonal pyramid ✔ None of these ✔

7 days ✘ 14 days ✘ 21 days ✘ 28 days ✔ none of these ✔

Portland-pozzolana cement ✘ quick setting cement ✘ low heat Portland cement ✘ rapid hardening cement ✔ none of these ✔

0% ✘ 0% ✘ 0% ✘ 0% ✔ 0% ✔

70 litres of sand and 120 litres of aggregates ✘ 70 kg of sand and 140 litres of aggregates ✘ 105 litres of sand and 140 litres of aggregates ✘ 105 litres of sand and 210 litres of aggregates ✔ none of these ✔

placing ✘ wetting ✘ curing ✘ compacting ✔ none of these ✔

M 100 ✘ M 200 ✘ M 300 ✘ M 400 ✔ M 500 ✔