Want to do their own cement board, but made out of the color on the white, how can make the cement board color made dark gray
I suggest you use PC32.5 cement (composite cement), because the cement is mixed with a lot of fly ash so this kind of cement to do the surface color is the deepest, of course, some of the factory with the lighter gray color, then After the cement is condensed, it is also darker than other cement, and some fly ash is grayed out. You buy cement when they look, there is a way to mix cement when they add coal dry stone powder or fly ash, of course, the strength of cement down, so if the choice of the latter should be mixed with their own purchase PO42.5 grade cement to blending, or do out of the cement board strength is too low is not enough. If the composite cement and then mixed with the need to grasp the amount of the problem.
In cement and asbestos cement, carbon blacks are often used as black or gray colorants, which are often used in roofing materials, cement construction materials, asbestos cement boards and highway concrete roads. For the application of carbon black in the cement and the requirements of the same paper, it is best to add a certain amount of wetting agent.
Carbon black for cement also has a role is the cement crushing accelerator, which can shorten the cement crushing time, and can also be its size thinning, to promote the flow of dry powder. In addition, in the anti-static coating can be carbon black and fiber in an appropriate proportion of mixed into the concrete, so that the concrete is conductive.
Powder can be added to the cement carbon black, 1% content.
The role of carbon black in cement is as follows:
Carbon black is used in many industries, such as ink, rubber and so on. These are more common applications. And I am afraid a lot of people do not know is that carbon black is also used in cement, and the role is more than one. In addition to carbon black can be used as a colorant of cement, but also can be used as cement crushing accelerator.
