ASR prevention — Effect of aluminum and lithium ions on the reaction products

Journal Article · Thu Oct 15 04:00:00 EDT 2015 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2015.06.002· OSTI ID:22475528

Leemann, Andreas ^[1]; Bernard, Laetitia ^[2]; Alahrache, Salaheddine; Winnefeld, Frank ^[1]

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1. Laboratory for Concrete/Construction Chemistry, Empa, Swiss Federal Laboratories for Material Science and Technology, Überlandstr. 129, 8600 Dübendorf (Switzerland)
2. Laboratory for Nanoscale Materials Science, Empa, Swiss Federal Laboratories for Material Science and Technology, Überlandstr. 129, 8600 Dübendorf (Switzerland)

In spite of the recent progress in the understanding of the mechanisms enabling aluminum-containing SCM like metakaolin and added LiNO{sub 3} to limit the extent of ASR in mortar and concrete, some gaps still remain. They concern mainly the effect of aluminum-containing SCM on the formed ASR products and the influence of aggregate characteristics on the effectiveness of LiNO{sub 3}. In this study, a model system, concrete and mortar were investigated by pore solution analysis, TGA, XRD, NMR, SEM combined with EDX and ToF-SIMS to address these questions. The amount of aluminum present in the pore solution of concrete and mortar is only able to slow down SiO{sub 2} dissolution but not to alter morphology, structure and composition of the reaction products. LiNO{sub 3} can suppress ASR by forming dense products protecting reactive minerals from further reaction. But its effectiveness is decreasing with increasing specific surface area of the reactive minerals in aggregates. - Highlights: • Aluminum of SCM slows down SiO{sub 2} dissolution. • Aluminum of SCM does not alter morphology and structure of ASR product. • ASR suppressing effect of LiNO{sub 3} depends on specific surface area of the aggregates.

• OSTI ID: 22475528
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 76; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
CONCRETES
DISSOLUTION
ION MICROPROBE ANALYSIS
LITHIUM IONS
LITHIUM NITRATES
MASS SPECTROSCOPY
MORPHOLOGY
MORTARS
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
SCANNING ELECTRON MICROSCOPY
SILICA
SILICON OXIDES
SPECIFIC SURFACE AREA
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY