GATE CE 2022: BUILDING MATERIALS

Match List - I with List – II :

General shrinkage in cement concrete is caused by

Which of the following statements is/are true?

1) According to Abram’s law, the strength of fully compacted concrete is directly proportional to water-cement ratio.

2) The fineness of cement is expressed in terms of specific surface of cement.

3) The fineness of cement can be calculated by Blaine air permeability method.

4) Coarser cement particles may cause bleeding by settling down in concrete.

Void ratio of cement, fine aggregates and coarse aggregates are 55%, 40% and 45% respectively. Design mix proportion 1 : 2 : 6 (by weight) with a water cement ratio of 0.5 is prepared. If bulk density of cement, fine aggregates and coarse aggregates are 1450 kg/m³, 1650 kg/m³ and 1600kg/m³ respectively. Then how many bags of cement are required for 1m³ production of fresh concrete ?

(Assume Air voids as 3% by volume of total fresh concrete and 1bag of cement = 50kg)

Consider the following statement regarding timber

I. Timber strength is more along grains

II. At the fiber saturation point, all water except water bound in the cell wall is removed.

III. Green timber cracks and splits easily

IV. Heartwood is preferable in engineering use.

Which of the following above statements is/are correct?

Which of the following statements is/are correct –

(More than one answers may be correct)