Department of Civil Engineering

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Author: search.filters.author.Bhunia, DipenduSubject: search.filters.subject.Concrete

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    EFFECT OF SAND REPLACEMENT BY MILL SCALE ON THE PROPERTIES OF CONCRETE
    (International Journal of Engineering Technology Science and Research, 2015-03) Bhunia, Dipendu; Singhal, Anupam
    Concrete is the most widely used construction material in the world. This popularity of concrete carries with it an immense environmental cost. Billions of tons of natural materials are mined and processed each year to be used in concrete, which leaves a substantial mark on the environment. Efforts to use suitable recycled materials as substitutes for concrete aggregate are gaining in importance, such as recycled concrete aggregate, post-consumer glass, tires, etc. But one waste material which has not been extensively tested yet is mill scale. Mill scale is a flaky hazardous solid waste formed on the steel’s surface during the steel manufacturing processes. This work aims to evaluate the use of mill scale in Portland cement concrete, as a replacement for natural fine aggregates. Cement mortars with mix proportioning 1:3 were prepared varying the mill scale content of fine aggregate form 0% to 100%, for determination of compressive and tensile strength. The water/cement ratio used was 0.5 for all mix proportions. The compressive strength at different proportions did not give a general trend and two peaks were obtained at 60% replacement and 100% replacement. Maximum tensile strength was observed at 60% replacement of standard sand. A mix design was also done for M35 grade of concrete by the IS method. OPC of 43 grade was selected and sand replacement was done with mill scale varying from 0% to 80% with a suitable water cement ratio of 0.40. The compressive strength was measured after 28 days of completion of curing. Maximum strength was obtained for 40% sand replacement. Moreover, concrete with mill scale has demanded greater water content to maintain the workability.
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    A study on environmental and economic impacts of using waste marble powder in concrete
    (Elsevier, 2017-09) Srivastava, Anshuman; Sangwan, Kuldip Singh; Bhunia, Dipendu
    Gainful utilization of waste marble powder in various construction practices has become a topic of interest in research areas. An overview of works reported regarding the use as partial replacement of sand and cement by marble powder in concrete is presented in the paper. Gaps in the studies to date have been pointed out. An environmental impact comparison of normal concrete with the use of marble powder as partial replacement of cement and sand is carried out using the UMBERTO NXT life cycle analysis software with ReCipe midpoint and endpoint methods. Finally, a detailed cost analysis study has been performed to justify the use of marble powder in concrete which has exhibited encouraging results in terms of strength and quality. It has also been found that the use of marble slurry in concrete reduces its environmental impact and is economically beneficial.
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    Analytical and Experimental Investigations on Using Waste Marble Powder in Concrete
    (ASCE, 2019-04) Srivastava, Anshuman; Bhunia, Dipendu
    Research using marble powder as a partial replacement of cement in concrete has gained a lot of attention recently. In this paper,the effect of dried marble powder on particle packing of concrete has been demonstrated. Experimental investigations have been conducted onthe effect of marble powder on hydration reaction, strength activity index, and possible reasons for the gain in strength. In addition, statisticalmethods were used to develop two mathematical models for marble powder incorporated in concrete using experimental values. In the firstmodel, the ratios of 28-day compressive strength between concrete with cement partially replaced by marble powder and control concretehave been related to marble powder replacement percentage. In the second model proposed, modified and simplified relationships for thewater-cement law when cement is partially replaced by marble powder have been provided. The first model was validated for both standardcubes and cylinders used for testing by researchers and the predictions showed only 7.15% error as compared with the experimental values.The second model might serve as a useful tool for mix proportioning of concrete mixes incorporating marble powder in concrete. Finally,based on a review of the literature and experimental results, a set of guidelines has been proposed for the use of marble powder as a partialreplacement of cement in concrete