alkaline activation

The adsorption of phenol, 4-chlorophenol, methylene blue, and Pb(II) by coal-based activated carbons prepared by a thermal shock alkaline activation was studied for the first time. The adsorption kinetics and isotherms were measured and compared with those of carbons obtained by a temperature-programmed activation. The adsorption rate was determined to be limited by the interaction of adsorbate with surface centers, and not by the diffusion into pores.

The development of high-performance materials, which are characterized by high compressive and flexural strength, durability and performance properties, is an urgent problem of modern construction. Engineered cementitious composites are one such material. Improving of properties of composites is achieved by partial replacement of cement with supplementary cementitious materials. The ratio of binder and filler components and superplasticizer consumption were selected.

There were analyzed the ways of reduction of СО2 emissions in the cement industry. It was shown that a significant reduction of СО2 emissions in construction is achieved through the using of composite cements with a lower clinker factor that meets the requirements of the low carbon strategy for the cement industry. In this case, the replacement of part of Portland cement clinker with mineral additives in such cements leads decreasing of their strength, especially at early age.