engleski

ISPITIVANJE UBRZIVAČA VEZANJA PORTLAND CEMENTA

Portland cement (PC) hydration consists of numerous individual physicochemical processes in complex interaction, e.g. processes of individual PC clinker minerals dissolution and precipitation of diverse hydration products. Hydration reaction is affected by substances dubbed concrete additives. These substances cause notable effects during the hydration reaction of fresh cement composite and modify its rheological properties, as well as those of hardened material. The scientific focus of this paper is the effect of calcium chloride, CaCl2, as setting accelerator on Portland cement hydration. In order to draw conclusions, it was necessary to determine optimal quantities of added CaCl2 for all effects tested (setting acceleration, increase in early compressive strengths etc.) The nature of the products of Portland cement hydration with CaCl2 addition was tested with X-ray diffraction analysis (XRD) as well as infrared spectroscopy (FTIR) methods.

Portland cement; setting accelerators; hydration; setting time; strength

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