Significance of properly proportioned fly ash based blended cement for sustainable concrete structures of tannery industry

Mahmud, Sultan; Manzur, Tanvir; Samrose, Samina; Torsha, Tafannum

doi:10.1016/j.istruc.2020.12.065

Cited by 13 publications

(3 citation statements)

References 24 publications

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“…This also results in the morphologies of the materials prepared with chitosan are quite different, such as films, gels, etc. Generally determined by light scattering method, high performance liquid chromatography and viscosity method [8][9].…”

Section: Physical and Chemical Properties Of Chitosanmentioning

confidence: 99%

Modified Chitosan Based on Optimized Design in the Treatment of Microbial Leaching Wastewater

2022

AJEB

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Currently, microbial leaching wastewater has caused immeasurable damage to the environment, so this wastewater must be properly treated to reduce environmental and biological damage. The purpose of this work is to study the physicochemical properties of chitosan, based on the optimized design of modified chitosan in microbial leaching wastewater treatment, using citric acid (CA) as the cross-linking agent chitosan (CTS) and two modified chitosan Chitosan, Chitosan-Citric Acid (CTS-CA) and Chitosan-Citrate-β-Cyclodextrin (CTS-CA-CD) from β-Cyclodextrin (CD) to Explore Modification Mechanisms. At the same time, the prepared modified chitosan was applied to the adsorption research of dye wastewater and heavy metal wastewater. With the increase of reaction temperature, the adsorption capacity of modified chitosan to Ni2+ also increased. It shows that the temperature is beneficial to the adsorption process. The higher the temperature, the better the adsorption effect of modified chitosan on Ni2+. The effect of initial solution pH on the adsorption process showed that at pH 7, the adsorption capacity of CTS-CA for Ni2+ was 33 mg/g, and the adsorption capacity of CTS-CA-CD for Ni2+ was 37 mg/g.

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Section: Physical and Chemical Properties Of Chitosanmentioning

confidence: 99%

Modified Chitosan Based on Optimized Design in the Treatment of Microbial Leaching Wastewater

2022

AJEB

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“…Nowadays, the use of several techniques, admixtures (mineral and chemical), alternate fillers, and fibers, is increasing to develop cost-effective, durable, and sustainable concrete structures. [1][2][3][4] In recent years, the use of high-strength concrete in infrastructure and building projects has increased for several advantages such as reduction in cross-section and dead load of structures. 5,6 High-strength concrete obviously contains higher cement content to achieve the desired strength.…”

Section: Introductionmentioning

confidence: 99%

Impact of slag‐fly ash cementitious system on thermal controls and durability of high‐strength mass concrete

Mokal,

Mandal,

Nayak

et al. 2023

Structural Concrete

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The rise in temperature due to the heat of hydration in the high‐strength mass concrete poses serious issues such as thermal cracking and delayed ettringite formation. The present experimental investigation is to optimize the proportions of SCMs like fly ash (FA) and ground granulated blast‐furnace slag (GGBS) for the same grade of high‐strength mass concrete with a focus on controlling the peak temperature rise and improving sustainability. For this purpose, one 100% ordinary Portland cement (OPC)‐based sample (T1) and five SCMs‐based samples viz. T2, T3, T4, T5, and T6 in which OPC was replaced by 20% FA, 35% FA, 50% GGBS, 70% GGBS, and 33%FA + 33% GGBS, respectively, were cast in the insulated blocks having one cubic meter volume. Analyzing critically, it is observed that for the same grade of concrete, the right blend of SCMs greatly reduces the peak core temperature (~33.2% and ~ 39.4% for T5 and T6 samples, respectively) than the sample prepared with 100% OPC. This is due to the reduction in the total heat of hydration in the SCMs‐based system than that of the OPC‐based system at early age. The amount of hydration products formed at early age varies for different percentages of SCMs, which is investigated by X‐ray diffraction (XRD), Fourier‐transform infrared spectroscopy (FTIR), and Field emission scanning electron microscopy (FESEM) analyses. Additionally, compressive strength analysis reveals that all the samples achieved almost similar strength (71.4, 74.6, 73.5, 71.5, 69.2, and 68.2 MPa, respectively, for T1 to T6 samples) at 56 days. Moreover, the rapid chloride permeability test (RCPT) values of the T2 to T5 samples are measured to be 597, 461, 672, 584, and 621 coulombs; while, the same is measured to be 2637, coulombs for the T1 sample, indicating higher durability of SCMs‐based samples. Finally, based on the analyses, a plausible model has been presented to explain the phenomenon, and industrial viability analysis is done to adjudge its suitability for an onsite application.

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“…To date, the most common SCM is siliceous fly ash [ 1 ], a by-product of coal burning in power plants. However, fly ash, which is used in the production of both cement and concrete, is slowly losing primacy due to the progressive decommissioning of coal-fired power plants.…”

Section: Introductionmentioning

confidence: 99%

Special Issue: Supplementary Cementitious Materials in Concrete, Part I

Fantilli

Jóźwiak–Niedźwiedzka

2021

Materials

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Significance of properly proportioned fly ash based blended cement for sustainable concrete structures of tannery industry

Cited by 13 publications

References 24 publications

Modified Chitosan Based on Optimized Design in the Treatment of Microbial Leaching Wastewater

Modified Chitosan Based on Optimized Design in the Treatment of Microbial Leaching Wastewater

Impact of slag‐fly ash cementitious system on thermal controls and durability of high‐strength mass concrete

Special Issue: Supplementary Cementitious Materials in Concrete, Part I

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