New wall materials : cement block
Cement block refers to a new type of wall material made by using fly ash, coal slag, coal gangue, tailings, chemical slag, natural sand, marine mud, etc. (one or more of the above raw materials) as the main raw materials, using cement as a coagulant, without high-temperature calcination. It is called cement brick.
Cement block have a relatively heavy weight and high strength, and do not require firing. Using fly ash, a pollutant from power plants, as a material is more environmentally friendly, and the country has been vigorously promoting it. The only drawback of this type of block is that it is not as good as red bricks when combined with plastering mortar, which can easily cause cracks on the wall and affect its appearance. During construction, sufficient water should be sprayed, and villas with higher requirements can consider hanging steel wire mesh on the entire wall to effectively prevent cracks.
Features of cement blocks
1. the economic benefits are significant. The production cost and market price of cement block may vary due to differences in raw materials and other expenses in different regions.
2. mature production technology: using high-pressure cement block making machine , cement block have good compactness, low water absorption, good frost resistance, and high strength. With these advantages, it can be applied to various urban construction projects.
3. the cost is relatively low. More than 80% of stone powder, waste stone materials, or construction waste can be added to environmentally friendly cement block to greatly reduce the cost of cement, in addition to reducing the cost of raw materials.
4. the product has a wide range of uses: Cement block have been widely used in environmental beautification of gardens, residential communities, universities, factories, sidewalks, squares, and other areas due to their advantages.
5. the equipment investment is small and the production speed is fast. in YIDE there several cement block machine for choosing . Establish a production line for colored pavement bricks with an annual output of 60000 to 120000 square meters. The equipment investment is small, and the time from equipment installation and debugging, training of workers, to the formation of mass production capacity is short.
Component of cement blocks
1. Clay: It should contain a certain amount of loose particles to facilitate the mixing of cement. Clay with low sand content can be mixed with sand in the soil. Clay with low sand content and relatively hard texture must be ground before being mixed with sand.
2. Cement: Adding 10% 425 # ordinary Portland cement can improve the strength and water resistance of bricks, without cracking after immersion. Otherwise, the bricks will generally crack.
3. Admixture: Adding a small amount of admixture (strengthening agent) can not only improve the hardening strength of the brick, but also reduce the amount of cement used and lower the cost of the product.
4. Water: With appropriate water usage, the strength of bricks will be higher. When the molding moisture is low, the strength of the brick is poor, and the material has a high resistance in the mold. With single-sided pressure, the bottom surface of the brick is not dense; Due to high moisture content during molding, the bottom surface is damp and prone to damage during molding. When the moisture content of sandy soil is 3-5%, it is advisable to use 10% water for molding. If there is too much fine sand in the raw material, it will decrease to 8%.
