SILICA-CARBONATE BUILDING MATERIALS PRODUCED BY INFILTRATION WITH SUPERCRITICAL CARBON DIOXIDE

Materials prepared by agglomerating white sand and slag with lime were subjected to infiltration with supercritical CO2 at temperatures from 31 to 40 degrees C, pressures from 7.4 to 10 MPa, and for periods from 20 to 120 minutes. This technique quickly promotes the carbonation reactions, which are responsible for the development of the cementitious properties of the composite material. The extent of carbonation inside 50 mm cubes was monitored by using phenolphthalein, and the crystalline species were determined by X-ray diffraction. The results showed a high conversion (greater than 74%) of lime to calcite. After infiltration, all specimens exhibited a significant increase in compressive strength. From these results, the authors conclude that it is possible to produce improved carbonated materials in short processing times. The infiltration technique may be useful for producing construction materials from a number of siliceous waste products such as slag, construction rubbish and sludges from water-treatment plants.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0870310267
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Ocampo, W A
  • Bolanos, G
  • Salazar, A
• Conference:
  • Seventh CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag and Natural Pozzolans in Concrete
  • Location: Chennai (Madras), India
  • Date: 2001-7-22 to 2001-7-27
• Publication Date: 2001

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 885-898
• Serial:
  • Volume: 2

Subject/Index Terms

• TRT Terms: Calcium hydroxide; Carbon dioxide; Carbonates; Carbonation; Compressive strength; Construction; Diffraction; Infiltration; Materials; Sand; Silica; Slag; White; X rays
• Uncontrolled Terms: Agglomeration
• Subject Areas: Construction; Geotechnology; Highways; Materials; I35: Miscellaneous Materials;

Filing Info

• Accession Number: 00819603
• Record Type: Publication
• ISBN: 0870310267
• Report/Paper Numbers: SP 199-51
• Files: TRIS
• Created Date: Nov 20 2001 12:00AM