How to make concrete bricks and blocks Lafarlcim
When making your first batch of bricks, try using coarse sand only. Then replace some with fine river sand and stones to see what makes the strongest mix for your bricks. Try using aggregate to cement ratios of 6:1, 8:1 and 10:1 (230 litres, 300 litres and 380 litres of aggregate per 50kg bag of cement).