Question

From a field data,

      Required compressive strength of an OPC air entrained concrete column at a moderate exposure is 37±3 MPa. Determine the amount of the ingredients in kg, per 1m³ of concrete: (a) water (b) cement (c) percent air content (d) coarse aggregate (No need to adjust moisture for coarse aggregate):

        Given,

• Nominal maximum size of coarse aggregate is 25 mm
• Bulk OD specific gravity of coarse aggregate is 2.64
• Oven dry-rodded density: 1650 kg/m³
• Fineness modulus of sand is 2.80
• Required slump is at least 50 mm

Answer 1

Amount of ingredients per 1 m^3 concrete.

A) water = 160 kg

B) Cement = 400 kg

C) Percent air content = 4.5

D) Coarse aggregate = 1105.5 kg

Explanation is given below