engleski

COMPARATIVE STUDY OF SELECTED PROPERTIES OF THREE BINDERS: BLENDED PORTLAND CEMENT, CALCIUM SULFOALUMINATE CEMENT AND ALKALI ACTIVATED MATERIAL BASED CONCRETE

The dependency on cement as the main binder in the manufacturing of concrete has increased the demand for cement. Though it is vital for construction, it has a significant carbon footprint as during its production , high energy is consumed , and greenhouse gases are emitted. According to recent studies, the cement industry currently contributes to approximately 10% of total global CO 2 emissions. To reduce the adverse effects, research has been ongoing following the principles of sustainability, to produce eco -friendlier alternative binders for the construction. In this experimental work, a comparative study was conducted on concrete prepared with calcium aluminate cement (CSA), Alkali -Activated Binder (AAM) and a reference blended Portland cement (PC). To evaluate the binders for potential utili sation, the compressive strength, capillary absorption, chloride diffusion and drying shrinkage were determined. The results indicated that CSA, though had higher chloride diffusion than PC on 28 days, this difference reduced on 56 days. At the same time, the difference between chloride diffusion of AAM and PC was exponential. The capillary absorption results indicated that both CSA and AAM achieved higher capillary absorption than PC. The drying shrinkage over time of CSA and PC were almost identical, whereas for AAM the shrinkage was much higher than PC and CSA at all tested ages of concrete. It was observed from the compressive strength that CSA achieved higher early age strength and similar 28 -days strength as PC while the AAM showed significant difference at different ages. Based on the results obtained, it is pointed out that, if alternative binders are to be used in concrete structures, their different properties compared to PC should be considered during preliminary design of concrete in structures.

: Alkali Activated Material ; Calcium Sulfo -aluminate Cement ; Durability ; Transport Properties ; Sustainable Concrete

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