To determine the number of cement bags required for 1 cubic meter of M20 grade concrete with 1% wastage, we need to consider the mix ratio and the volume of one bag of cement.

Mix Ratio for M20 Grade Concrete:

• Cement: 1 part
• Sand: 1.5 parts
• Aggregate: 3 parts

Total Parts: 1 + 1.5 + 3 = 5.5 parts

Volume of One Bag of Cement: Approximately 0.035 cubic meters

Calculation:

1. Volume of Cement Required:

   • Volume of one part = 1 / 5.5 cubic meters
   • Volume of cement required = 1 part * (1 / 5.5) cubic meters = 0.1818 cubic meters

2. Adding 1% Wastage:

   • Volume of cement required with wastage = 0.1818 * 1.01 = 0.1836 cubic meters

3. Number of Bags Required:

   • Number of bags = Volume of cement required / Volume of one bag of cement
   • Number of bags = 0.1836 / 0.035 ≈ 5.24

Rounding Up:

Since we cannot buy a fraction of a bag, we need to round up to the nearest whole number.

Therefore, you will need approximately 6 bags of cement for 1 cubic meter of M20 grade concrete with 1% wastage.

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