Improving the optical quality of the exposed concrete surface
Many parameters are responsible for the color or brightness of a concrete surface and how homogeneous the surface appears. Examples include: natural colors of the raw materials (including fluctuations), weighing or dosing accuracy of the raw materials, sieve line, moisture of the aggregate, concrete recipe, mixing process, temperature and weather conditions in concrete production and processing, hydration conditions, formwork (material and condition), release agent (type and application thickness), post-processing, post-treatment and, if appropriate, subsequent coating or hydrophobing. The variety of factors that play a role in producing the brightness and color of the concrete surface makes it clear: it cannot be possible to completely control all of these factors all the time.
Dr. Peter Weber has written an article on this topic for the magazine BFT, in which reference to Improving the optical quality of the exposed concrete surface Arrives.