Study of Effective Barite Concrete Mix Design for Gamma-ray Attenuation

Pamuko Aditya Rahman, Withit Pansuk


Preliminary study of heavyweight concrete has been conducted, providing basic information of mix design to attenuate γ-ray. This study summarizes some mixtures and compares with mixtures that are widely used in Thailand since the potential of local materials is needed to be more explored. Proportional determinations of heavyweight mixture are majority affected by workability, density, and material cost; the lack of these data is also another reason in performing this study. We limit our study into barite (BaSO4) because they are highly available in Thailand and we expect to use it for a mass production. Modification experiment is expected to achieve effective barite concrete mixture using local material from Thailand and measure relevancy when it applies in Thailand. This experiment evaluated density of concrete, compressive strength, and linear attenuation coefficient of concrete as parameter to determine the effectiveness of the mixture. 7 different barite concrete mixtures with 3 variations of w/c ratios and 3 classifications of coarse aggregate percentages will be examined. Using Cesium-137 and Cobalt-60 energy sources, linear attenuation coefficient (μ) of barite concrete will be measured with different energies which are 0.662 MeV, 1.173 MeV, and 1.332 MeV. W/c ratio has significant impact to workability, associated to strength of concrete and indirectly influences the concrete density. Not only w/c ratios, percentage of coarse aggregate in mixture also impact to linear attenuation coefficient of concrete. We concluded that the effective barite coarse percentage for appropriate workability but still has high density and strength is 0.65 for all water-cement ratios. Consideration addition percentage of coarse aggregate into mixture must be taken wisely due to segregation effect and voids in concrete. Furthermore, barite concrete has high capability to attenuate γ-ray due to high density. These novel insights may be useful for various applications e.g., nuclear power plant and medical units. 

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