Department of Civil Engineering

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Author: search.filters.author.Srivastava, AnshumanSubject: search.filters.subject.Civil engineering

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Now showing 1 - 5 of 5
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    Pollutant removal from paint, mortar, and reinforced composite and evaluating the engineering properties by incorporate the photocatalyst: BaTio3
    (Wiley, 2025-07) Singh, Shamsher Bahadur; Srivastava, Anshuman
    The present work explores to study the pollutant removal properties of mortar, concrete, and paint by incorporating the BaTiO3 as photocatalysts with different dosages (0.5%, 1%, and 2%) replaced by weight of cement and 20 g in white paint of 40 mL. To investigate the pollutant removal property of specimens prepared with Ordinary Portland Cement (OPC) and white cement (WC) and white paint on ordinary wall, Rhodamine B dye is used as a pollutant. The pollutant removal property was investigated for 4 days in laboratory experiment and 4 days in the field experiment. It was observed that the specimen having dosage of 2% photocatalyst have the best result in pollutant removal than the other specimen in laboratory experiment. The catalyst shows pollutant removal ability in white paint even in the presence of sunlight effectively and maintains the color’s grace of the paint. The compressive strength increased with the addition of a photocatalyst, and other engineering properties of the specimens were the same even at different dosages of the photocatalyst. The photocatalyst BaTiO3 remove the pollutant from paint, mortar, and reinforced composite without affecting the all the engineering properties.
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    Exploratory study on concrete incorporating copper tailings and marble dust as partial substitutes for ordinary portland cement
    (Springer, 2025-07) Lahoti, Mukund; Srivastava, Anshuman
    Supplementary cementitious materials are crucial to reduce costs and carbon footprint, as traditional cement production emits greenhouse gases. This study explores using copper tailings and marble dust as substitutes for Ordinary Portland Cement (OPC) in concrete. In this investigation, three concrete mixes were designed, and tests were carried out to compare their tensile and compressive strengths. C0M0 served as the control mix, i.e., mix with no replacement of OPC. While in C5M5 mix, 10% OPC was replaced by 5% copper tailings and 5% marble dust. While in mix C5M10, 15% OPC was replaced by 5% copper tailing and 10% marble dust. Experimental observation was that the control mix (C0M0) exhibited highest compressive strength, which then declined for C5M5 mix and further retreated in increasing path in C5M10 mix, with almost reaching compressive strength of the C0M0 (control) mix. The compressive strength as compared to the control mix was reduced by about 24.8% for C5M5 mix and close to 0.9% for C5M10 mix. The observed decrease in strength was attributed to the moisture-absorbing nature of copper tailings and marble dust, which limited water availability for OPC hydration, while marble dust's filler action contributed to strength gain. Ultrasonic Pulse Velocity (UPV) tests established a relationship between compressive strength and sound velocity. Economic analysis revealed the cost-effectiveness of concrete incorporating copper tailings and marble dust. The study highlights the potential for developing concrete strength with these waste materials, promoting environmentally friendly and cost-effective construction practices.
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    Assessment of different curing methods on marble dust concrete
    (Springer, 2025-03) Srivastava, Anshuman
    This research deals with significance of marble dust containing concrete by using different curing methods on it. Marble dust is used as a partial replacement of cement ranging from 0 to 15% by cement weights were considered in concrete. The most important aim of this study to reveal effectiv method of curing which gives better mechanical and durability properties like compressive strength and durability property of marble dust incorporated concrete. These experimental studies analyze the three different curing methods and assessment of the compressive strength, and also the variation of marble dust replacement percentage with cement is also taken into experimentation.
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    Marble dust as a sustainable cementitious material: investigating the synergistic effects of curing conditions
    (Taylor & Francis, 2025-04) Srivastava, Anshuman
    This study examines the effect of seven different curing regimes (normal water, marine environment, ambient, jute bag, polythene bag, accelerated water, and carbonation curing) on the mechanical properties and durability of concrete that incorporates marble dust as partial replacement of cement at 0%, 2.5%, 5%, 7.5%, 10%, 12.5%, and 15% replacement rates. The curing regime considerably impacted minimizing the compressive, flexural, and split tensile strength losses induced by increased marble dust content. Under normal water curing, an optimum 7.5% marble dust dosage resulted in a 9.5% increase in 28-day compressive strength over the control mix. Carbonation curing resulted in higher 28-day flexural strengths (up to 12.5% marble dust) than normal water curing. Marine environment curing reduced strength significantly (up to a 30.1% decrease at 7-day compressive strength at 15% marble dust) due to chloride ion interference. Water absorption dropped by up to 15.7% at the optimal 7.5% marble dust dosage under normal water curing but increased by up to 3.9% under ambient curing, highlighting the importance of adequate curing for pozzolanic reactions. Rapid chloride permeability testing revealed up to 53.9% lower charge passing values under normal water curing at 15% marble dust, demonstrating better chloride resistance when compared to other curing regimes. Continuous hydration and pozzolanic reaction facilitation through appropriate curing procedures, such as conventional and accelerated water curing, significantly increased performance at optimal marble dust dosages. The study emphasizes the importance of adjusting curing regimens to optimize the use of marble dust as a sustainable SCM in concrete production.
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    Computational design of fly ash geopolymer mortar using experimental and attribute evaluation approaches
    (Springer, 2024-10) Lahoti, Mukund; Srivastava, Anshuman
    Geopolymer is a ceramic-like inorganic material synthesized at room temperature and is a potential sustainable replacement of Portland cement. In the present work, a comprehensive experimental program was designed to evaluate the relative importance of mix design factors controlling the strength of fly ash geopolymer mortar. Restrained factors, namely, temperature of curing; alkaline solution to fly ash (L/FA) ratio; sodium silicate to sodium hydroxide (SS/SH) ratio; sodium hydroxide molarity; and fly ash to sand (FA/Sand) ratio, and unrestrained factors, namely, H2O/Na2O; SiO2/Al2O3; SiO2/Na2O; and Al2O3/Na2O molar ratios, were considered for evaluation. Feature subset selection and multivariate adaptive regression splines (MARS) techniques were used to determine the significance of these factors. Results show that temperature of curing is the most significant factor. FA/Sand and L/FA are found to affect compressive strength more significantly than sodium hydroxide molarity and SS/SH. Except for H2O/Na2O molar ratio, other molar ratios were observed to be very less significant. It is noted that mix design of geopolymer mortar should not be based on the molar ratios, instead mix design must be prepared by controlling the restrained factors. The findings of this study should be helpful in optimization of design factors leading to a robust geopolymer mix.