Carbon neutral off-white rice husk ash as a partial white cement replacement

Rossella M. Ferraro, Antonio Nanni, Rajan K. Vempati, Fabio Matta

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Large amounts of rice husk ash (RHA) are produced every year worldwide, and difficulties related to its disposal may cause this product to become an environmental hazard. Owing to its high amorphous silica content, RHA has shown to be a valid supplementary cementing material in the production of concrete. This paper presents the physical and chemical properties of a new generation RHA that is off-white in color, is carbon neutral, and has no crystalline SiO2 and toxic metals. The effects on mechanical properties of a mixture using off-white rice hull ash (OWRHA) as partial replacement of white cement were also investigated. The OWRHA-blended concrete has higher compressive and splitting tensile strengths at various ages compared with the control mixture. It is shown that up to 15% of OWRHA could be advantageously blended with white cement to enhance white concrete performance without modifying the aesthetics of the final product.

Original languageEnglish (US)
Article number013010QMT
Pages (from-to)1078-1083
Number of pages6
JournalJournal of Materials in Civil Engineering
Issue number10
StatePublished - Mar 1 2010


  • Ashes
  • By-product
  • Cement
  • Mechanical properties
  • Recycling

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering
  • Materials Science(all)
  • Mechanics of Materials


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