Abstract
Rice husk ash (RHA) is bio-organic nano SiO 2 produced by controlled burning of rice husk and has high pozzolanic activity. The present paper is aimed at revealing the origin of high specific surface area and high pozzolanic activity of RHA by exploring its structure at micro and nano level. Rice husk calcined at 500, 600, 700 and 800 °C, was tested for compressive strength and X-ray diffraction (XRD) analysis while Scanning Electron Microscopy (SEM) and Transmission Electron Microscope (TEM) analysis were carried out on selected samples of RHA. From the XRD analysis and compressive strength test results, it can be concluded that the optimum combustion temperature for obtaining highly reactive RHA is 600 °C. SEM and TEM images showed that RHA has three layered structure i.e. inner, outer and interfacial with honeycombed and interstitial pores. These pores are actually the main reason for very large specific surface area and very high chemical activity of RHA.
| Original language | English |
|---|---|
| Pages (from-to) | 541-547 |
| Number of pages | 7 |
| Journal | Construction and Building Materials |
| Volume | 29 |
| DOIs | |
| Publication status | Published - Apr 2012 |
| Externally published | Yes |
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Keywords
- Bio-organic nano SiO
- Pozzolanic activity
- Rice husk ash
- Specific surface area
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- Materials Science(all)
Cite this
Microstructure and reactivity of rich husk ash. / Xu, Weiting; Lo, Tommy Y.; Memon, Shazim Ali.
In: Construction and Building Materials, Vol. 29, 04.2012, p. 541-547.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Microstructure and reactivity of rich husk ash
AU - Xu, Weiting
AU - Lo, Tommy Y.
AU - Memon, Shazim Ali
PY - 2012/4
Y1 - 2012/4
N2 - Rice husk ash (RHA) is bio-organic nano SiO 2 produced by controlled burning of rice husk and has high pozzolanic activity. The present paper is aimed at revealing the origin of high specific surface area and high pozzolanic activity of RHA by exploring its structure at micro and nano level. Rice husk calcined at 500, 600, 700 and 800 °C, was tested for compressive strength and X-ray diffraction (XRD) analysis while Scanning Electron Microscopy (SEM) and Transmission Electron Microscope (TEM) analysis were carried out on selected samples of RHA. From the XRD analysis and compressive strength test results, it can be concluded that the optimum combustion temperature for obtaining highly reactive RHA is 600 °C. SEM and TEM images showed that RHA has three layered structure i.e. inner, outer and interfacial with honeycombed and interstitial pores. These pores are actually the main reason for very large specific surface area and very high chemical activity of RHA.
AB - Rice husk ash (RHA) is bio-organic nano SiO 2 produced by controlled burning of rice husk and has high pozzolanic activity. The present paper is aimed at revealing the origin of high specific surface area and high pozzolanic activity of RHA by exploring its structure at micro and nano level. Rice husk calcined at 500, 600, 700 and 800 °C, was tested for compressive strength and X-ray diffraction (XRD) analysis while Scanning Electron Microscopy (SEM) and Transmission Electron Microscope (TEM) analysis were carried out on selected samples of RHA. From the XRD analysis and compressive strength test results, it can be concluded that the optimum combustion temperature for obtaining highly reactive RHA is 600 °C. SEM and TEM images showed that RHA has three layered structure i.e. inner, outer and interfacial with honeycombed and interstitial pores. These pores are actually the main reason for very large specific surface area and very high chemical activity of RHA.
KW - Bio-organic nano SiO
KW - Pozzolanic activity
KW - Rice husk ash
KW - Specific surface area
UR - http://www.scopus.com/inward/record.url?scp=83655201562&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=83655201562&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2011.11.005
DO - 10.1016/j.conbuildmat.2011.11.005
M3 - Article
VL - 29
SP - 541
EP - 547
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
ER -