The number of concrete blocks you can make from one bag of 50kg cement mixed with sand depends on several factors.

Let’s break it down:

1. Mix Ratio: The typical mix ratio for laying concrete blocks is 1:6, which means one part cement (equivalent to one 50 kg bag of cement) mixed with six parts of sand.

2. Mortar Volume: First, let’s find the amount of mortar produced by mixing 1 bag of cement with sand. The total volume of one 50 kg bag of cement is approximately 0.0347 m³.

3. Concrete Block Volumes:

   • A 4-inch concrete block has a volume of approximately 0.008 m³.
   • A 5-inch concrete block has a volume of approximately 0.01 m³.
   • A 6-inch concrete block has a volume of approximately 0.012 m³.
   • An 8-inch concrete block has a volume of approximately 0.016 m³.
   • A 9-inch concrete block has a volume of approximately 0.018 m³.

4. Calculations:

   • 4-inch blocks: Number of 4-inch blocks per 50 kg bag of cement = 0.243 / 0.008 ≈ 30 blocks.
   • 5-inch blocks: Number of 5-inch blocks per 50 kg bag of cement = 0.243 / 0.01 ≈ 25 blocks.
   • 6-inch blocks: Number of 6-inch blocks per 50 kg bag of cement = 0.243 / 0.012 ≈ 20 blocks.
   • 8-inch blocks: Number of 8-inch blocks per 50 kg bag of cement = 0.243 / 0.016 ≈ 16 blocks.
   • 9-inch blocks: Number of 9-inch blocks per 50 kg bag of cement = 0.243 / 0.018 ≈ 14 blocks.

Keep in mind that these estimates are approximate and can vary based on factors like wastage during production and the specific type of blocks being made. Happy building! 🧱🏗️