Jan 2020 DIY: HOW TO MAKE CONCRETE BRICKS
Using a general purpose, normal strength cement such as Sephaku 32,5N or Sephaku 42,5N for the more serious builder, Sephaku Cement shares a step by step process on how to make DIY concrete bricks.
The most commonly used material in both the formal and informal construction industry; Portland Cement, offers the industry a durable and longer lasting building solution to any other material used in foundations, mortar, paving, roofing and flooring. Historically bricks were more commonly made from clay and clay derivatives, but making use of concrete bricks was a means to more cost effective masonry work, concrete bricks are now widely used in construction depending on the desired finish.
To follow, see how to make your own concrete bricks using Sephaku Cement with these simple steps.
- Step One: Preparing a Timber Casting MouldWith the help of a very simple wooden framework making your own concrete bricks is a walk in the park. With this step being as complicated as its going to get, using timber boards measured and cut to size together with a plywood backing reinforced by plastic sheeting to prevent leaking, nail together a wooden casting mould used to shape your concrete bricks into the appropriate dimensions.While you can create a casting mould and bricks as large or small as you’d prefer, the following specifications are measured to make a mould that will result in a batch of eight cement bricks at a time, each measuring dimensions of5.1cm wide, 22,9cm long and 8.9cm deep.Erect your timber casting mould that will resemble that of a wooden ladder with equidistant steps and a plywood backing by measuring your timber with two sides of 1.2 m long and nine “steps” measuring 22.9 cm in length, spaced 5.1cm (4 inches) apart.Using plastic sheeting as a backing, place your stepladder framework on the plywood backing which will help prevent the wet concrete from oozing through the cracks/joints once poured into the frame. It’s also recommended that you spray each mould with an aerosol lubricant or oil to assist in the removal of the bricks once cured.
- Step Two: Mixing Brick CementMaking use of a normal strength cement such as Sephaku 32,5N or Sephaku 42,5N, begin by blending the cement together with a mixture of coarse and fine river sand aggregate measured at typical rations of cement to sand mixtures of 1:7, 1:8 or 1:9. Before mixing with water blend together the dry ingredients ensuring that the aggregate and cement is completely combined. Next create a well in the centre of the concrete blend and following the applicable water rations detailed on the bag of cement, very slowly add water to the mix to wet the mixture little by little as to not over wet the mixture. The mixture must be dry but not crumbly.(able to be easily squeezed into a ball)
- Step Three: Pouring and Curing CementCarefully fill your timber mould with wet concrete doing so more effectively using a spade instead of pouring it into the cast. Pay careful attention in making sure that the corners of each mould are filled or your bricks will not cure with perpendicular edges. Once each brick mould is filled gently tap all around the timber mould which will help to settle the concrete mixture into the corners. Using a straight edged trowel smooth out the surface of the concrete bricks levelling the surface as you go and then cover with a plastic sheet which will help to regulate the rate at which the brick cures during the first 24 hr period. The brick can be taken out of the mould very carefully and could be cured further after taking them out of the moulds by keeping them wet and covered with plastic sheeting. Once cured, The DIY brick can be used for your project.