Which of the following factor helps concrete to have lubricating effect to reduce internal friction for helping easy compaction ?
(a) Grading of aggregate
(b) Surface texture of aggregate
(c) Mix proportions
(d) Use of admixtures
1
(b), (c) and (d) only
2
(a), (c) and (d) only
3
(a), (b), (c) and (d)
4
(a), (b) and (c) only
5
Question Not Attempted