Paper Type |
Contributed Paper |
Title |
Superior Properties and Structural Analysis of Geopolymer Synthesized from Red Clay |
Author |
Pattarawan Choeycharoen*, Watcharee Sornlar, Witaya Shongkittikul and Anucha Wannagon |
Email |
pattarac@mtec.or.th |
Abstract: Red clays from different sources have different compositions and properties. They are
abundant natural resources in Thailand. However, there is no report on using red clays for studying
geopolymer structures. In this work, geopolymers were synthesized from four sources of red clays in
Thailand including Chiangmai, Korat, Ratchaburi and Angthong using kaolin clay from Lampang as a
reference. The samples were prepared using 2:3 mixed alkaline solution of 10 M NaOH and Na2SiO3
with 60:40 solid/liquid ratio by weight. Among them, Chiangmai red clay generated the best properties
of 38.85±1.66 MPa compressive strength and 11.40±1.24 MPa bending strength. The strengths were
inversely proportional to the elemental Si/Al ratio of the raw materials, in which the Chiangmai red
clay has the lowest value at 1.49. In addition, 29Si and 27Al MAS-NMR data showed that the structure
of geopolymers from the Chiangmai red clay was in 3-dimensional network while the others were
sheet-like or chain networks which resulted in their low strengths. It was found that the red clays could
be used as a main raw material for synthesis geopolymers, especially Chiangmai red clay which had
better strength than the Lampang kaolin. The red clays in Thailand have high potential to produce
low-cost geopolymers. They have good mechanical properties and are plentiful in Thailand.
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Start & End Page |
1234 - 1248 |
Received Date |
2019-05-17 |
Revised Date |
|
Accepted Date |
2019-08-09 |
Full Text |
Download |
Keyword |
geopolymer, red clay, NMR, structures, mechanical properties |
Volume |
Vol.46 No.6 (November 2019) |
DOI |
|
Citation |
Choeycharoen P., Sornlar W., Shongkittikul W. and Wannagon A., Superior Properties and Structural Analysis of Geopolymer Synthesized from Red Clay, Chiang Mai J. Sci., 2019; 46(6): 1234-1248. |
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