Mitigation of ASR by the use of LiNO{sub 3}—Characterization of the reaction products

Journal Article · Thu May 01 04:00:00 EDT 2014 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2014.02.003· OSTI ID:22323138

Leemann, Andreas ^[1]; Lörtscher, Luzia ^[2]; Bernard, Laetitia; Le Saout, Gwenn; Lothenbach, Barbara ^[1]; Espinosa-Marzal, Rosa M. ^[2]

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1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstr. 129, 8600 Dübendorf (Switzerland)
2. Institute for Surface Science and Technology (D-MATL), ETH Zurich, Schafmattstr. 6, 8093 Zurich (Switzerland)

The influence of the LiNO{sub 3} on the ASR product was studied both in a model system and in mortars. In the model system, the addition of LiNO{sub 3} decreases the dissolution rate and the solubility of silica. Lithium changes the 2-dimensional cross-linked (Q{sub 3} dominated) network of the ASR product into a less structured, Q{sub 2} dominated product, likely by adopting the role of calcium. In the mortar samples the addition of LiNO{sub 3} decreases expansion and significantly influences the chemical composition and the morphology of the reaction product. Lithium decreases the calcium, sodium and potassium content and changes the relatively porous plate-like reaction product into a dense one without texture. The findings in the mortars indicate that the ASR-suppressing effect of lithium is caused by the lower potential of the reaction product to swell. Furthermore, it forms a protective barrier after an initial reaction slowing down ASR. - Highlights: • Detection of lithium in ASR product by ToF-SIMS • Relation between composition of pore solution and ASR product • Identification of ASR suppressing mechanisms of LiNO{sub 3}.

• OSTI ID: 22323138
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 59; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM
CHEMICAL COMPOSITION
DETECTION
DISSOLUTION
LITHIUM
LITHIUM NITRATES
MASS SPECTROSCOPY
MICROSTRUCTURE
POROUS MATERIALS
POTASSIUM
SILICA