How to make your own concrete blocks
· Sand and stones will form the aggregates for the concrete bricks. You can use pit or fine river sand, coarse sand (up to 5mm in size) or stones that are no bigger than 10mm for hollow bricks or 13mm for solid bricks. Usually, you can make concrete bricks with just coarse sand, but a combination of aggregates can also be used. When you make your first batch of bricks, try to use coarse sand ...