Measuring: It is essential to cut concrete blocks precisely if you are going to build a patio or wall with them. With a tape measure, determine how long the concrete block will fit in the space. concrete blocks generally have a uniform size, so it’s not necessary to measure the width. In terms of size and shape, the most common size of concrete blocks is 8 x 8 x 16 inches (20 x 20 x 41 cm).
Marking: Measure the concrete block and mark it with white chalk. You’ll cut the block at the spot you marked with chalk. When the concrete block needs to fit into a space that is 8 inches (20 cm) long, measure 8 inches (20 cm) from the end and mark it with chalk. If you’d like to be more precise, hold the straight edge of the ruler across the block at the mark. Make a line crossing the block along the ruler’s edge.
Using masonry blade: Using the circular saw, insert the masonry blade. Cutting through concrete blocks is possible with this kind of blade. A plastic sheath covering the currently installed blade can be lifted up with a spring-loaded latch. Remove the retaining bolt at the centre of the circular blade with a 3⁄4 in (1.9 cm) wrench. Once the bolt is removed, lift the blade out of its housing and replace it with the masonry blade. Using the wrench, screw the bolt back into place over the blade’s centre. Afterward, snap back the blade cover into place. The hardware store sells masonry blades (or circular saws) if you don’t have one. It may be cheaper to rent one instead of buying a circular saw if you’re going to use it only for this one job.
Use safety equipment: Before you begin cutting the block, put on safety equipment. Concrete dust will be generated by cutting concrete blocks with a circular saw. When splitting or cutting concrete blocks, wear a mask with ventilation to protect your lungs. The dust that this creates can damage your lungs if inhaled. Make sure you wear sound-blocking earmuffs or ear plugs while using the loud saw, as well as wearing protective glasses to avoid being hit with annoying pieces of concrete block.
Align the blade: Align the blade with the chalk mark on the concrete block. Use your dominant hand to align the saw as you hold the concrete block in place with your non-dominant hand. When viewing the circular saw from above, you’ll notice an obvious notch with the blade indicating where the blade will make contact with the metal surface. Ensure that this line is aligned with the chalk mark that you made earlier. It’s essential that you make sure you keep checking the saw as you’re cutting.
Start cutting: Take one sweep at a time, cutting smoothly and accurately. You can start the blade spinning by releasing the trigger inside the handguard of the saw. Push the saw forward to cut through the block when it’s at full speed. Cutting will allow more metal to contact the concrete block due to the protective covering being pushed back. Cutting through the block usually takes one cut. Likewise, if the concrete block is still not quite cut, finish bisecting it with an additional two or three cuts. Once you’ve cut through the block, turn off the saw. Keep your fingers out of the way of the saw if you use one hand to stabilize the block while you cut! The circular saw could easily slice a finger off.
Wiping the surface: Wet a rag and wipe the concrete block clean. You’ll see fine dust on the block after you’re done cutting. Using water, wet a rag and wring it out. You can clean the concrete block halves by running the rag lightly over them. After this, you are ready to start installing the block in your project. You can also clean off the saw before putting it away if it is covered in dust.