Browsing by Author "Sarker, A."

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    OPTIMUM FLYASH TO INCREASE THE STRENGTH OF SUBGRADE
    (Dept. of CE, CUET, 19-Dec-2018) Sarker, A.; Iqbal, M. B.; Rahman, M. M.; A-Noor, M. C.; Rahman, M. A; Islam, M. R.
    Stabilization of problematic soils with fly ash not only improves engineering properties of soil but also provides a solution to challenges of fly ash disposal. Approximately 52,000 tons of fly ash produced annually at Boropukuria coal-based power plant in Bangladesh require a huge disposal area and create environmental problems. This paper reports the results of laboratory investigation carried out on expansive soil collected from Rajendrapur area stabilized with fly ash in varying percentages. Here, 4% cement is used as an activator. The effect of cement with varying fly ash contents are correlated with soaked California bearing ratio (CBR) value, swelling index and Atterberg limits of stabilized soil. The study finds that soaked CBR value of the soil improves from 1.73% to 26.07% after adding 6% of fly ash for 14 days of curing. With increasing of more fly ash content, strength decreases. So optimum value of fly ash content is 6% for which highest strength is obtained. Moreover, swelling index of the collected soil with 4-days soaking condition is found to be decreased by 47% when 6% fly ash is added. The outcome of this study will guide road engineers of Bangladesh to use fly ash as a stabilizing agent to improve the properties of subgrade
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    Present Status and Mitigation Approaches of Arsenic in the Environment of Bangladesh: A Critical Review
    (Springer Nature, 2023-01-01) Islam, M. S.; Phoungthong, K.; Islam, A. R. M. T.; Ali, M. M.; Sarker, A.; Kabir, M. H.; Idris, A. M.
    Arsenic is a toxic metalloid that enters the environment through natural and anthropogenic sources. A small amount of arsenic remains in living organisms, but its exposure at elevated concentrations is hazardous and thus creates a toxic effect. Evidence has shown that the level of arsenic in Bangladeshi foodstuffs is higher than the permissible limits set by the World Health Organization and other regulatory bodies in Bangladesh. Previously published reports show that the transport and abundance of arsenic create potential threats to the fresh and processed products of Bangladesh. However, monitoring and assessment of arsenic toxicity in the exposure sources are lacking. Although severe contamination of arsenic in the environmental matrices and numerous foodstuffs has been summarized, a perilous appraisal concerning trophic transfer and arsenic exposure through environmental matrices in Bangladesh has not yet been accomplished. This review critically discussed arsenic pollution, exposure toxicity, unexploited research gaps and prevailing legislation for pollution control. This study also highlighted the potential transfer of arsenic within the food webs, and sustainable strategies for arsenic pollution control to enhance food safety as a vital issue in Bangladesh. Furthermore, the current review urgently recommends formulating a conceptual policy framework to combat arsenic contamination in Bangladesh’s environment.