Ceramics-Silikáty

The use of supplementary cementitious materials (SCMs), such as silica fume (FS), granulated blast furnace slag (GGBS), and fly ash (FA), is becoming increasingly popular in the cement industry due to the various benefits they bring to the table, such as reducing the construction costs, decreasing the energy consumption, and reducing greenhouse gas emissions. Therefore, the objective of this study is to test a new eco-friendly composite cement using local granulated blast furnace slag (GGBS) and dune sand powder (DSP). In this study, plain and tow blended mixtures were fabricated for the blended mixtures, 15% GGBS by weight of the total binder materials and different percentages of dune sand powder (5%, and 10%) were incorporated as partial cement replacement materials. The physical, mechanical, and durability characteristics were evaluated by determining setting time and consistency by measuring the compressive strength, chemical resistance, water permeability, drying shrinkage and water swelling. The results showed that partial substitution of cement with (15%GGBS+5%DSP) increases the compressive strength at 90 days, providing comparable strength to ordinary Portland cement concrete at 28 and 60 days. The study also showed that the partial substitution of cement with GGBS and DSP increases the setting time of the cement and improves the mix consistency. The results indicate that the composite cement with GGBS and DSP exhibits excellent resistance to chemical attacks and has lower water permeability than Portland cement concrete. The results also show that the composite cement has better resistance to water swelling and a slightly higher drying shrinkage compared to Portland cement.