Reaction of rice husk ash with OPC and portlandite

L. M. Ordonez, J. Paya, Alison Margaret Coats, Fredrik Paul Glasser

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9 Citations (Scopus)

Abstract

Sandwiches made of pelleted rice husk ash (RHA) and an OPC/hydrated lime mixture were immersed in distilled water for 7 and 28 days at 25degrees and 40 +/- 1degreesC to study interdiffusion occurring during pozzolanic reaction. For this purpose BSE microphotographs and chemical image maps for Si, Ca, K, Ma, Fe, Al and S were made across the reaction interface of pellets. Furthermore, porosities of RHA pellets were determined. BSE and Ca maps show the formation of a reaction product layer within the space formerly occupied by, RHA. This layer is composed of C-S-H and is thicker in RHA/hydrated lime (125-150 mum) than in RHA/OPC (20-40 mum) pellets after 7 days. Its thickness does not much increase a er 7 days. In a fixed time, reaction extends to greater depth at 20degreesC than 40degreesC , indicating that the pozzolanic reaction rate is not accelerated by temperature in this range.

Original languageEnglish
Pages (from-to)113-119
Number of pages6
JournalAdvances in Cement Research
Volume14
Issue number3
DOIs
Publication statusPublished - 2002

Keywords

  • CEMENT-BASED MATERIALS
  • FUNDAMENTAL EQUATIONS
  • OXYGEN-DIFFUSION
  • PASTES
  • IONS
  • TRANSPORTATION
  • CHLORIDE
  • BEHAVIOR
  • WATER

Cite this

Ordonez, L. M., Paya, J., Coats, A. M., & Glasser, F. P. (2002). Reaction of rice husk ash with OPC and portlandite. Advances in Cement Research, 14(3), 113-119. https://doi.org/10.1680/adcr.14.3.113.38279