Influence of replacing Portland cement with three different concrete sludge wastes

Martins, Juliana Vieira; Garcia, Dayana Cristina Silva; Aguilar, Maria Teresa Paulino; Santos, White José dos

doi:10.1016/j.conbuildmat.2021.124519

Cited by 17 publications

(4 citation statements)

References 40 publications

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“…Concrete is one of the most widely used building materials, with an annual global consumption of 25 billion tons [ 3 ]. At present, various separation and recycling processes are used in its production, enabling the reuse of water and coarse aggregates [ 2 , 4 , 5 ]. The remaining concrete sludge (fine aggregates and cement particles) can be used in the production of ceramic materials [ 6 ], synthesis of geopolymers [ 7 ], or in the production of new concrete to reduce the required amount of cement [ 1 , 3 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Phosphate and Ammonium on Waste Building Sludge

et al. 2023

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Two selected waste building sludges (WBS) were used in this study: (i) sludge from the production and processing of prestressed concrete pillars (B) and (ii) sludge from the production of technical stone (TS). The materials were used in their original and Fe-modified forms (BFe/TSFe) for the adsorption of NH4+ and PO43− from contaminated waters. The experiments were performed on a model solution simulating real wastewater with a concentration of 1.7 mmol·L−1 (NH4+) and 0.2 mmol·L−1 (PO43−). The adsorption of PO43− had a high efficiency (>99%) on B, BFe and TSFe, while for TS, the adsorption of PO43− was futile due to the high content of available P in the raw TS. The adsorption of NH4+ on all sorbents (B/BFe, TS/TSFe) had a lower efficiency (<60%), while TS proved to be the most effective. Leaching tests were performed according to the CSN EN 12457 standard for B/BFe and TS/TSFe before and after NH4+ and PO43− sorption when the contents of these ions in the leachates were affected by adsorption experiments in the cases of B and TS. For BFe and TSFe, the ion content in the leachates before and after the adsorption experiments was similar.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Phosphate and Ammonium on Waste Building Sludge

et al. 2023

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“…Therefore, a new approach is needed. Solid waste management is one of the most major difficulties in urban areas and a major environmental problem due to the vast amounts of waste produced (Singh and Chaurasia, 2022;Martins et al, 2021). Cement prices are soaring.…”

Section: Introductionmentioning

confidence: 99%

Concrete made from waste paper sludge (WPS): a sustainable material

Kore

Rajput²,

Agarwal³

et al. 2023

TECHS

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PurposeThe growing quantity of waste is a worrying reality that has resulted in environmental sustainability challenges. Waste paper sludge (WPS) in large quantities from paper mill industry are produced every year. Their disposal in landfills, in general, pollutes the environment. Cement manufacture also contributes to global warming by emitting carbon dioxide. As a result, a novel use of industrial wastes as a supplemental cementitious ingredient in concrete formulation can help to mitigate the environmental problem. This paper aims to study the possibility of usage of WPS as partial replacements of cement for sustainable development of concrete.Design/methodology/approachThis study aims at testing the mechanical properties of concrete that has been mixed with WPS. Between 5% and 20% of the weight of cement, WPS was used to substitute it. The water binder ratios of 0.55, 0.50, 0.45 and 0.42 were all considered for an experiment to better understand the impact of WPS on concrete. In terms of workability, density, water absorption (WA), compressive strength (CS) and flexural strength (FS), concrete mixtures were created, tested and compared to traditional concrete mixes.FindingsAccording to the findings, the initial and final setting times of the concrete mixtures were both significantly delayed, and the workability and density of the concrete mixtures were both significantly lowered at all water binder ratios and replacement levels. Both compressive and FS of concrete made with WSP declined significantly at all water binder ratio. Substitution of cement by WPS enhanced the WA of all the concrete mixes. The mechanical performance of concrete mixtures that were made with a replacement level of 5% exhibited noticeable improvements. Whereas the more is the replacement levels the more the loss in the mechanical properties were noted. The ideal replacement levels for the WPS are up to 5% only.Originality/valueThis paper contributes to the literature by exploring the ecological and sustainable effects of using WPS in construction materials.

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“…Due to a large amount of pollutants and wastes generated in the production process of ready-mixed concrete [1][2][3], the industry is considered to be highly polluting and energy-consuming [4,5]. Generally, for every 1 m 3 of concrete manufactured, 0.02 t of the waste residue of a ready-mixed concrete station (WRMS) will be produced [6][7][8]. As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Composite Admixture Based on Ready-Mixed Concrete Waste Residuals

Jiang¹,

Xiong²,

Bao³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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Reasonable treatment and utilization of waste residuals discharged during the production of ready-mixed concrete is an important problem in the cement industry. In this study, a composite admixture was prepared by using ready-mixed concrete waste residuals, furnace slag, and water granulated slag. The grinding characteristics of such material were investigated. Moreover, the effect of such admixture on cement hydration and pore structure was analyzed by X-ray diffraction, thermogravimetric-differential scanning calorimetry, scanning electron microcopy and mercury intrusion porosimetry. As shown by the results: The grinding characteristics of the waste residuals can be improved significantly by mixing them with furnace slag and water granulated slag. Furthermore, the composite admixture does not change the composition of hydration products; rather it contributes to refine the pore structure of the matrix, thus improving the mechanical properties of these cement-based materials.

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Influence of replacing Portland cement with three different concrete sludge wastes

Cited by 17 publications

References 40 publications

Adsorption of Phosphate and Ammonium on Waste Building Sludge

Adsorption of Phosphate and Ammonium on Waste Building Sludge

Concrete made from waste paper sludge (WPS): a sustainable material

Analysis of a Composite Admixture Based on Ready-Mixed Concrete Waste Residuals

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