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

Heavy loaded R.C.C columns and R.C.C arches of long spans use concrete composing of cement, sand & aggregate in which of the following ratios?

1
1 : 2 : 4
2
1 : 4 : 8
3
1 : 5 : 10
4
1 : 6 : 12
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