Concrete block machine are used to build houses

The recipe for the concrete block machine is 1:12-14 in other words 1 part cement : 12-14 parts sum graded aggregates. Aggregate is sand, gravel, crushed stone, slag, and recycled concrete and is used to reinforcement the strength. You will use fine and course aggregate.

Put plastic inside your wooden mold and then pour in the concrete. Wait 24 hours, flip your block out and make another one.

Lead paint can be removed from concrete relatively safely if you use protective gear and special products. Methods such as dry sanding or chipping must be avoided because these methods release lead dust into the air. In addition, heat guns, which are commonly used in paint removal, are not suitable for removing lead-based paint. The high heat may release fumes containing lead. Instead, soy-based products which soften and encapsulate the paint can be used with a much higher degree of safety.

Put on all protective gear (safety glasses, rubber gloves, disposable tyvek suit and shoe covers and a painter's mask) before beginning this project. If the cement you are working on is indoors, you should also open all windows in the room to provide extra ventilation.

Take all items not essential for the job off of the cement. Place protective plastic sheeting over grass and foliage (if outside) or any other items you wish to protect from the remover.

Sweep loose debris from the floor. Mix the paint remover according to label directions. For example, Lead Out requires you to mix the stabilizer powder with the stripper gel.

Pour the paint remover over the paint. Spread it evenly over the entire surface using a soft broom or a paint roller (long-handled). Make sure you spread it thick enough or it will not work as well (follow label directions).

Using a concrete brick machine as a template, measure around the outside of the block and cut 2 x 4's to length. You will be making a box. 4 sides and a bottom but no top, as you will be pouring the concrete into the box. The Typical size is 300 x 200 x 150 mm. Use screws to hold the box together instead of nails. When you get the hang of it you will want to build a lot more wooden molds and can produce 100 blocks a day.

Secure the area (if possible) to prevent people or animals from getting on the cement while you wait for the product to work. If indoors, close the doors to the room. If outdoors, put up signs or rope barriers. You will need to wait up to 24 hours for the product to finish its process.

Place two garbage bags (one inside the other) into a cardboard box. This will be your paint disposal area (the cardboard box makes it easier to carry the paint to the disposal site or outdoor trash container).

Scrape up the paint with a long-handled scraper. Paint should come up easily. If it does not, the product needs more time to work (or you did not apply enough). Place the paint (you can use the scraper or a small shovel) into the garbage bags inside the cardboard box. When the box is full, tie the bags closed and dispose of them according to product label directions or your local household waste authority's advice.

Mop the cement with water according to the product instructions. Scrubbing with the mop may or may not be necessary. If outdoors, you can use a water hose--the paint remover should have rendered the lead in the paint relatively harmless (but follow label instructions regarding rinsing the area).

Concrete brick machine are usually produced using a semi-mechanized stationary type machine. These machines run thousands of dollars and allow you to produce a 1000 blocks per day. But if you are just starting out and can't afford a machine yet, you can build your own mold.