Mitigation of ASR Expansion by Biomass/Coal Fly Ash and the Underlying Mechanism by Pore Solution Chemistry

This investigation experimentally documents mitigation of alkali-silica-reaction (ASR) expansion through partial replacement of cement and coal-biomass cofired fly ash. ASTM C 277 and 441 guide the experimental techniques. Biomass and Class F fly ash reduce ASR expansion within o.1% at the 6 month with 35% replacement ratio, although biomass fly ash has much higher available Na20equiv (by ASTM C 33). Further analysis of pore solution by high pressure extrusion illustrates that biomass fly ash mixes have similar alkali metal concentrations to Class C mixes, but biomass fly ash is at least equal or much better than Class C in mitigating ASR expansion. This implied that biomass fly ash may absorb alkalis from the pore solution and may form non-expansive products instead of the expansive alkali silica gel.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/139780870312410
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Wang, S
  • Bragonje, S
  • Tullis, J
  • Dalton, R
  • Baxter, L
• Conference:
  • Ninth CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag and Natural Pozzolans in Concrete
  • Location: Warsaw , Poland
  • Date: 2007-5-20 to 2007-5-25
• Publication Date: 2007

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 267-278
• Monograph Title: Ninth CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag and Natural Pozzolans in Concrete

Subject/Index Terms

• TRT Terms: Admixtures; Alkali; Alkali silica reactions; Biomass; Coal; Concrete; Expansion; Fly ash; Porosity
• Uncontrolled Terms: Pore solution chemistry
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01053790
• Record Type: Publication
• ISBN: 139780870312410
• Report/Paper Numbers: SP-242-21
• Files: TRIS
• Created Date: Jul 20 2007 9:55AM