Influence of mineralogy on the hydraulic properties of ladle slag

Influence of mineralogy on the hydraulic properties of ladle slag,10.1016/j.cemconres.2011.04.003,Cement and Concrete Research,Daniel Adolfsson,Ryan R

Influence of mineralogy on the hydraulic properties of ladle slag  
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The present study is aimed at investigating the hydraulic characteristics of ladle furnace slag (LFS), under the pretence of using LFS as a cement substitute in certain applications. Furthermore, LFS has been considered as a possible activator in a blend containing 50% LFS, and 50% ground granulated blast furnace slag (GGBFS). Phases detected in LFS were quantified using Rietveld analysis. Calorimetric studies were performed at 20, 25 and 30°C in order to calculate the apparent activation energy of hydration and thereby to suggest a kinetic model for the tested compositions within this temperature interval. In addition, compressive strength tests were performed on mortar prisms made with LFS, and LFS/GGBFS which had hydrated for 2, 7 and 28days. Both compositions reached acceptable early strengths, (e.g. LFS, 33.1MPa, and LFS/GGBFS, 17.9MPa, after 2days), but after 28days hydration the blend was superior to neat LFS. Related apparent activation energies were determined using an Avrami–Erofeev model and gave Ea=58kJ/mol for neat LFS and Ea=63kJ/mol for the blend. The results imply that LFS or a LFS/GGBFS blend can be favourably used as supplement in binder applications such as binder in by-product metallurgical briquettes, which are used as recycle to the blast furnace or basic oxygen furnace depending on the specific briquette composition.
Journal: Cement and Concrete Research - CEM CONCR RES , vol. 41, no. 8, pp. 865-871, 2011
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