Browsing by Author "Ali, M. M."

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    EVALUATION OF IN SITU MECHANICAL PROPERTIES AND QUALITY OF CONCRETE STRUCTURES BY NON DESTRUCTIVE TESTING
    (Dept. of CE, CUET, 19-Dec-2018) Ali, M. M.; Saeem, A. A.; Ahmed, M. S.; Ali, M. Z.
    The non-destructive testing (NDT) of various components of reinforced cement concrete structures is becoming increasingly important for both economic and safety reasons in Bangladesh perspective. The modern NDT methods have received growing attention during recent years, especially to study the mechanical properties and quality characterization of damaged constructions made of concrete. There are many non-engineered constructions of reinforced concrete (RC) buildings which have been constructed without any consideration to resist earthquake forces or without following current code of earthquake resistance design. A quick NDT assessment could be a good approach for safety measurement of buildings within considerable cost for such type of seismically deficient buildings. In this study, a five (5) storied RCC building was selected and assessed its mechanical properties and quality of concrete through NDT. To investigate the mechanical properties of existing concrete structures against different loading patterns, several non-destructive tests such as Ferro-scanner, Rebar detector, Ultrasonic device, rebound hammer have been introduced. The present work deals with different NDT techniques for the assessment of the quality of existing old concrete structures and key findings obtained from the analysis of the surveyed data.
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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.