Mechanisms Accompanying Chromium Release from Concrete

Abstract

The use of mineral additives from the power and metallurgy industries in the production of building materials still raises questions about the ecological safety of such materials. These questions are particularly associated with the release of heavy metals. The article presents research related to the leaching of chromium from concretes made of Portland cement CEM I and slag cement CEM III/B (containing 75% of granulated blast furnace slag). Concrete was evaluated for leaching mechanisms that may appear during tank test over the long term (64 days). It has been presented that the dominating process associated with the leaching of chromium from both types of concrete is surface wash-off. Between the 9th and 64th day of the test, leaching of Portland cement concrete can be diffusion controlled. It has been proven that the participation of slag in the composition of concrete does not affect the level of leaching of chromium into the environment from concrete.

The importance of time and other determinants in the assessment of heavy metals release during solid waste management

“…Leaching of metals from wastes in the monolithic form can occur by various mechanisms, such as diffusion, dissolution, or leaching from surfaces, which in turn affects the quantity of leachability. Based on the authors' research also published in other papers 37 , 38 , it was observed that the mechanisms controlling the heavy metals release also depends on duration of leaching process . For some materials, the leaching process may increase after several days of contact with water (see Fig.…”

Recycled Materials for Concrete and Other Composites

“…Additionally, Landa-Sánchez et al [ 16 ] determine the corrosion resistance of green concrete (GC) admixtures containing recycled coarse aggregate and reinforced with AISI 1080 carbon steel and AISI 304 stainless steel. In turn, Król [ 17 ] presents the result of leaching of chromium from concretes made of Portland cement CEM I and slag cement CEM III/B containing 75% granulated blast furnace slag.…”