Study of the expansion of cement mortars manufactured with Ladle Furnace Slag LFS

Industrial by-products generated in the steel manufacturing are successfully used as raw materials in the production of construction materials. However, steel slags, due to their nature and composition, can cause undesirable side-effects in mortars and concretes. The reactive components of LFS and E...

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Bibliographic Details
Published inMateriales de construcción (Madrid) Vol. 69; no. 334; pp. 183 - e183
Main Authors Rodríguez, A., Santamaría-Vicario, I., Calderón, V., Junco, C., García-Cuadrado, J.
Format Journal Article
LanguageEnglish
Published Madrid Consejo Superior de Investigaciones Científicas 2019
Subjects
Acicular structure
Aggregates
Alkali-aggregate reactions
Cement
Concrete
Construction materials
Consumption
Design
Economic activity
Environmental impact
expansion
Humidity
Hydration
Ladle metallurgy
lfs
Masonry
Mineralogy
mortar
Mortars (material)
Natural resources
Particle size
Pretreatment
Raw materials
reactivity
Silicon dioxide
Slag
Stability
Steel construction
Steel making
steelmaking slags
Spain
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Summary:Industrial by-products generated in the steel manufacturing are successfully used as raw materials in the production of construction materials. However, steel slags, due to their nature and composition, can cause undesirable side-effects in mortars and concretes. The reactive components of LFS and EAFS can affect the stability of the cement matrix. This situation may be prevented by an adequate pre-treatment of slag stabilization and a study of the possible reactions within its mineralogical components, to ensure the stability of the slag over time. In this work, an experimental process is shown to evaluate the behaviour of LFS under adverse environmental conditions when used as aggregates in the manufacture of cement mortars for masonry, such as the presence of humidity, high temperatures (80°C) and possible alkali-silica and alkali-silicate reactions. The results show an acceptable behaviour under normal environmental conditions (20°C). However, the formation crystalline acicular structures were observed under high temperatures (80°C) and in the presence of humidity, which degraded the internal structure of the mortars manufactured with LFS.
ISSN:0465-2746
1988-3226
DOI:10.3989/mc.2019.06018