Effects of Lithium Nitrate Admixture on Early-age Cement Hydration

Although benefits of lithium admixtures for mitigation of alkali-silica reaction have been well documented, the potential ancillary effects of lithium compounds on cement and concrete remain largely uncharacterized. To examine the effects of the most common lithium admixture--lithium nitrate--on early-age behavior, the admixture was introduced at dosages of 0-400% of the recommended dosage to 6 cements of varying composition and to a cement-fly ash blend. Behavior was examined by isothermal calorimetry and measurements of chemical shrinkage, autogenous shrinkage, and setting time. Results indicate lithium nitrate accelerates the early hydration of most cements but may retard hydration after 24 h. In the lowest alkali cement tested, set times were shortened in the presence of lithium nitrate by 15-22%. Higher dosages appeared to increase autogenous shrinkage after 40 days. The replacement of cement by Class F fly ash at 20% by weight appeared to diminish the early acceleration effects, but later hydration retardation and autogenous shrinkage were still observed.

• Record URL:
  • https://doi.org/10.1016/j.cemconres.2007.11.009
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00088846
• Supplemental Notes:
  • Abstract reprinted with permission from Elsevier
• Authors:
  • Kurtis, K E
  • Millard, M J
• Publication Date: 2008-4

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 500-510
• Serial:
  • Cement and Concrete Research
  • Volume: 38
  • Issue Number: 4
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Admixtures; Alkali silica reactions; Hydration; Lithium compounds; Setting (Concrete); Shrinkage
• Uncontrolled Terms: Acceleration; Early age concrete; Lithium nitrate
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01099394
• Record Type: Publication
• Files: TRIS
• Created Date: May 21 2008 7:06AM