Preparation and characterization of cogon grass natural fiber as a concrete filler for gamma radiation shielding
Concrete is a combination of cement, fine aggregate, coarse aggregate, and water. Concrete has a high shielding potential against gamma radiation from radioactive source. Concretes having a higher attenuation coefficient may be produced by varying the additives of various specific densities to inc...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Anali
2021
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/3481/1/J12703_f981107d54538b209640490f8c8613c9.pdf http://eprints.uthm.edu.my/3481/ |
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| Summary: | Concrete is a combination of cement, fine aggregate, coarse aggregate, and water. Concrete has a high shielding potential against
gamma radiation from radioactive source. Concretes having a higher attenuation coefficient may be produced by varying the
additives of various specific densities to increase the shielding performance. This study uses a cogon grass fiber, an invasive and
unwanted grass due to their ability to grow, and disrupt desirable vegetation efficiently as a reinforcement material mixed into
the concrete composite to observe its performance in radiation shielding. Natural fiber is known to have a tolerance to post
splitting, high energy absorption and increased fatigue resistance of cement-based composites. Cogon grass fibers are use with
different percentages of 0%, 0.5%, 1.0% and 1.5% fiber content with four different thicknesses. In this study, the chemical and
physical properties of cogon grass were characterized by the hydrolysis process (Chesson Method) and Atomic Force
Microscopy (AFM), respectively. The effect of different percentage of cogon grass fiber in concrete with different thickness to
linear attenuation coefficient, the difference of linear attenuation coefficient value between lead concrete and cogon grass fiber
concrete and half value layer (HVL) were also investigated. The possibility of using cogon grass natural fiber as a block of
concrete for gamma radiation shielding was also evaluated based on the results obtained in this study. The results show that the
hemicellulose, cellulose and lignin content of raw cogon grass fiber were 27.60%, 36.62% and 6.11%, respectively. AFM
micrograph of cogon grass showed a blocky and rough surface. The calculated linear attenuation coefficient of cogon grass fiber
showed an increase with the increase of fiber content and thickness. However, lead concrete showed a higher attenuation
coefficient and lower HVL value compared to cogon grass fiber. Despite that, cogon grass fiber concrete may have the potential
to be used as shielding material with some improvement. |
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