KINETICS OF THE POZZOLANIC REACTION BETWEEN LIME AND SUGAR CANE STRAW ASH BY ELECTRICAL CONDUCTIVITY MEASUREMENT: A KINETIC-DIFFUSIVE MODEL

Pozzolans are incorporated as active additions to Portland cement (PC) and concrete due to their capacity for reacting to lime (calcium hydroxide), principally originated during the hydration of PC. The result is the formation of stable, hydraulic and insoluble compounds, principally calcium silicate hydrated (CSH) phases due to the chemical reactions of the amorphous silica present in the pozzolan with lime. This article reports on a study in which the kinetics of the pozzolanic reaction between lime and sugar cane straw ash (SCSA) with 20 percent and 30 percent of clay burned at 800 degrees and 1000 degrees Celsius are investigated. The experimental variable is the conductivity of the mixtures. The authors established a calibration curve to correlate the conductivity with the concentration of lime (calcium hydroxide). The mathematical model also allows the researchers to describe the process in either kinetic or kinetic-diffusive regimes. The results of the study show that SCSA has a good pozzolanic activity comparable to that of the rice husk ash (RHA). In addition, the SCSA may constitute an alternative source of energy in countries lacking energy reserves and/or those having a high volume of wastes due to their agricultural economy.

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• Corporate Authors:

  Elsevier

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• Authors:
  • Villar-Cocina, E
  • Valencia-Morales, E
  • Gonzalez-Rodriguez, R
  • Hernandez-Ruiz, J
• Publication Date: 2003-4

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 517-524
• Serial:
  • Cement and Concrete Research
  • Volume: 33
  • Issue Number: 4
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Ash content; Calcium hydroxide; Kinetics; Mathematical models; Portland cement; Portland pozzolan cement; Pozzolanic action; Sulfonates
• Uncontrolled Terms: Rice hull ash
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00981423
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 15 2004 12:00AM