For optimal results when working with masonry blocks, it is crucial to follow best practices. Do not wet blocks before laying them in the wall, as they should be dry to minimize subsequent shrinkage. When it comes to cleaning concrete masonry, ensure that mortar is kept off the face of the blocks. Clean off any droppings as work progresses and before the mortar sets. Whenever possible, avoid cleaning down with acid.
Attention to detail is essential when it comes to color. Make sure to order enough product to complete the project at the same time to avoid batch variations. Control of shrinkage cracking is another important consideration. Concrete masonry blocks behave differently from clay bricks in terms of moisture movement and temperature changes. Assuming sound foundations are provided, cracks in walls can be avoided by the correct use of control joints, bond beams, and/or joint reinforcement. The rules for using these elements are contained in Australian Standard 3700-2011.
Useful estimating data is also available for your convenience. Blocks with a 390x190mm face equate to 12.5 units per square meter and 2.5 units per linear meter. To fill 200mm bond beams, allow 0.013m3 of concrete per linear meter of beam. To core fill 150mm 'H' blocks, allow 0.65m3 of concrete per 100 blocks. To core fill 200mm blocks, allow 0.8m3 of concrete per 100 blocks. To core fill 200mm 'H' blocks, allow 0.84m3 of concrete per 100 blocks. To core fill 300mm blocks, allow 1.1m3 of concrete per 100 blocks.
Features
- Ensure blocks are dry before use to minimize shrinkage.
- Order sufficient quantities to avoid batch variations.
- Follow Australian Standard 3700-2011 for control joints and reinforcement.
