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Thanks for the advice. I followed how you calculated the amount of cement bags for the 100 cubic meters of concrete, by using the data in Engineering in Emergencies Table 19.6. I calculated more conservative quantities by using the following example below 1. Required volume of concrete = 100 m3 2. Estimated volume of dry material = 100 x 1.65 = 165 m3 (includes 10% waste) 3. Mix totals = 1+3+6 = 10 (1:3:6 cement:sand:gravel) 4. Ingredient Volumes: 165 x 1/10 = 16.5 m3 cement, 165 x 3/10 = 49.5 m3 sand 165 x 6/10 = 99 m3 gravel 5. # Bags of cement: 16.5 m3 cement / .0332 m3 per 50 Kg bag = 497 bags of cement (use three bags) Let me know what you think of the above calculation. Your advice on the mortar is very help as well. Can you give more details on how the mortar quantities were calculated from first principles? The standard mortar bed depth used in Southern Sudan is 20mm.

Thanks, Don Lucey