railway RRB JE (CBT I + CBT II) Mock Test 2024 Construction Materials and Management Concrete

For concreting of shallow sections with vibrations, using the concrete of very low workability, the Vee- Bee Time required as per recommendations is in the range of

1

10 - 20 seconds

2

5 - 9 seconds

3

25 - 35 seconds

4

0 - 4 seconds

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