| ชื่อบทความ |
Compressive Mechanical Behavior of Red Loess/Black-Rice Husk Ash Composite Material under Variations of Firing Temperature |
| วัน/เดือน/ปี ที่ได้ตอบรับ |
27 มิถุนายน 2559 |
| วารสาร |
| ชื่อวารสาร |
Suranaree Journal of Science and Technology |
| มาตรฐานของวารสาร |
TCI |
| หน่วยงานเจ้าของวารสาร |
Suranaree University of Technology |
| ISBN/ISSN |
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| ปีที่ |
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| ฉบับที่ |
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| เดือน |
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| ปี พ.ศ. ที่พิมพ์ |
2559 |
| หน้า |
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| บทคัดย่อ |
Red loess and black-rice husk ash (B-RHA) composite was investigated for its compressive strength. The loess was collected in Khon Kaen University and sieved through mesh No.60. Clay components of red loess were enhanced up to
9% by gravitational settling. This oriented loess was then mixed with blackrice
husk ash (B-RHA) at a dry solid weight ratio of 1:1. The mixture was
casted in a cylindrical mold with a diameter and height of 1.7 cm and 3.4 cm,
respectively. The green bodies were fired under different fixed temperatures
of 900, 1000, 1100, and 1200oC. Tridymite and cristobalite were dominant
silica polymorphism found under the applied firing temperatures especially at
1200oC. Uniaxial compression tests were performed on un-oriented loess,
unmixed oriented loess, and oriented loess/B-RHA composite. The oriented
loess was found to be more rigid than the un-oriented loess and the loess
composite. The elastic modulus of the oriented loess was found to be as high as
4 GPa, which is twice as much compared to that of the un-oriented loess at the
same firing temperature of 1,200oC. It can be surmised that the structural
network of red ferric oxide-clay loess stabilizes the strength of the material
when fine-grained silica is reduced, resulting in a higher strength of loess after
orientation. Fired bodies of loess/B-RHA composite showed a significant
decrease in its elastic modulus which is approximately 45 times less compared
to that of the unmixed oriented loess. This is a result of an increased amount
of voids of the composite due to the incineration of B-RHA. In addition to the
reduction of its elastic modulus and compressive strength, the composite also
shows extreme brittleness. However, the relationship of both yield strength
and elastic modulus of the composite as a function of temperature shows a
strong linear behavior in contrast to that of the un-oriented loess and unmixed
oriented loess. It can be inferred that B-RHA in the composite decomposes into
voids at a similar rate that quartz transforms to higher phases during the firing
process. |
| คำสำคัญ |
red loess, rice husk ash (RHA), compressive strength, mechanical behavior |
| ผู้เขียน |
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| การประเมินบทความ |
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| Citation |
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