Question
Download Solution PDFUnder properly controlled combustion and temperature, what is the percentage of silica content that can be obtained from rice husk ash?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation
RICE HUSK ASH(RHA)
- Rice husk ash (RHA) is one of the abundantly available materials in rice grown countries
- Its high surface area, which comes from the microporous structure of the ash particles, and the existence of this type of silica are what are responsible for its reactivity.
- When obtained from controlled combustion the average composition of well-burnt RHA is 90% amorphous silica, 5% carbon, and 2% K2O.
- RHA contains a high percentage of silica content (SiO2). In controlled burning chambers, RHA can be highly reactive pozzolanic material.
- The combustion process creates a secondary Calcium-Silicate-Hydrate (C--S--H) gel which determines the pozzolanic activity of the RHA.
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