OPTIMIZED PREPARATION OF RICE HUSK ASH (RHA) AS A SUPPLEMENTARY CEMENTITIOUS MATERIAL

Authors

  • Carmela Denise Isberto
  • Krystoffer Lloyd Labra
  • Jan Marielle B. Landicho
  • Richard De Jesus

Keywords:

Rice husk ash, Cementitious, Incineration, High silica, SCM, Pozzolans

Abstract

For years, supplementary cementitious materials (SCM) has been extensively used as an integral
component in the production of concrete. This has been motivated by sustainability efforts and reduced
environmental impact. Correspondingly, this study intended to develop an appropriate method for the use of
rice husk ash (RHA), a by-product of rice husk (RH) which exists abundantly in the Philippines, as a partial
replacement to ordinary Portland cement (OPC). Different studies have suggested optimal percentage
replacement values of RHA, from 10% to 20%, which demonstrated vast improvement in strength of the
resulting blended concrete. These optimal values, however, immensely depends on the burning preparation of
RHA which adversely affects the amorphous silica components, and therefore the pozzolanic activities of RHA
in concrete. In this research, a potential approach to convert RH into optimized and highly reactive RHA by
controlled burning and grinding is provided. The effect of RHA in the strength of cement mortar was
investigated through the various proportions of 5, 10, 15, and 20% RHA by weight replacement of cement.
Some of the findings are: (i) controlled combustion of RH with temperature ranging from 400 to 600 °C and a
slow method of cooling for 6 to 8 hours were some of the critical factors needed to produce high silica content,
(ii) concrete containing up to 10% RHA replacement is optimal in maximizing the strength of cement mortar,
and (iii) the incorporation of RHA in concrete by 15% and 20% replacement by weight indicated a lower
workability.

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Published

2018-12-15

How to Cite

Carmela Denise Isberto, Krystoffer Lloyd Labra, Jan Marielle B. Landicho, & Richard De Jesus. (2018). OPTIMIZED PREPARATION OF RICE HUSK ASH (RHA) AS A SUPPLEMENTARY CEMENTITIOUS MATERIAL. GEOMATE Journal, 16(57), 56–61. Retrieved from https://geomatejournal.com/geomate/article/view/2810

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