Physical, mechanical properties and durability of cement mortars containing fly ash from the sewage sludge incineration process

Zdeb, Tomasz; Tracz, Tomasz; Adamczyk, Marcin

doi:10.1016/j.jclepro.2022.131055

Cited by 19 publications

(5 citation statements)

References 31 publications

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“…Similar results were obtained by Huang et al, showing the replacement of MgO by FA in MOC will lead to a large strength reduction due to the decreased amount of main hydrate [ 10 ]. Moreover, the lubricating effect induced by spherical FA particles would reduce the mechanical interaction with the hydrates, resulting in a negative effect on the strength of hardened pastes [ 33 ].…”

Section: Role Of Fly Ash In Moc Pastesmentioning

confidence: 99%

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Eco-Sustainable Magnesium Oxychloride Cement Pastes Containing Waste Ammonia Soda Residue and Fly Ash

et al. 2022

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Magnesium oxychloride cement (MOC), a type of special construction material, has drawn much research attention in solid waste utilization and environmental protection due to its eco-friendly production. Ammonia soda residue (ASR), a by-product generated from sodium carbonate manufacturing, is one of the industrial wastes that can be recycled in MOC systems. However, ASR exhibits adverse effects on the fresh performance and volume stability of MOC pastes. This paper aims at improving the properties of ASR-MOC by introducing fly ash (FA), solid waste from the power industry. Firstly, the roles of FA in MOC pastes are evaluated and analyzed. Then, three substitution ratios of FA (33.3%, 50% and 66.7% in weight) for ASR are designed for MOC pastes with 10% to 40% industrial wastes. Flowability, setting, strength and expansion of all mixtures were experimentally studied. Furthermore, X-ray diffraction (XRD) and scanning electron microscope (SEM) approaches were adopted to illustrate the microstructure changes. Results show that by adding different amounts of FA, the inferior flowability of MOC caused by ASR can be improved by 6–23%, the setting process can be prolonged by 30–55% and the expansion ratio can be reduced by 14–66%. The intensity of characteristic peaks of 5-phase and Mg(OH)2, together with the degrees of crystallization in XRD curves, well explain the strength variation and volume stability of ASR-MOC pastes. According to the regulation of relative specification, up to 20% of solid wastes in weight (10% FA + 10% ASR) can be consumed, contributing greatly to the greener sustainable development of construction materials.

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Section: Role Of Fly Ash In Moc Pastesmentioning

confidence: 99%

“…Due to the inhibition of FA on the hydration process, the amount of acicular 5-phase becomes less, instead, scattered crystals appear ( Figure 7 b,c). Such morphology leads to less compactness of the internal structures, thus reducing the strength of MOC pastes [ 33 ].…”

Section: Role Of Fly Ash In Moc Pastesmentioning

confidence: 99%

Eco-Sustainable Magnesium Oxychloride Cement Pastes Containing Waste Ammonia Soda Residue and Fly Ash

et al. 2022

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“…The outcomes of the many research studies of different authors, summarized in Table 1 [ 9 , 21 , 22 , 23 , 24 , 25 , 26 ], reported that wastewater sludge and similar by-products can be considered as beneficial environmentally risk-free raw materials that may be integrated into the cementitious matrix and be a partial substitute for sand in cement mortar or cement concrete mix. To that end, a practical and feasible utilization solution can be accomplished with the possibility of being quickly commercialized.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Application of Waste Sludges from the Wastewater Treatment Plant Generated during the Production of Heating Devices in the Construction Industry

Stojmenović,

Gulicovski,

Nišić

et al. 2024

Materials

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This research presented, for the first time, the results of the successful application of the waste press sludges, WSLP (plant for lacquer and paint) and WSEP (powdery enamel plant), from a wastewater treatment plant generated during heating device production in the construction industry. The results of WSEP characterization and its influence on cement paste, mortar, and concrete properties showed that this material could be used as a cement replacement (with a maximum replacement amount of 20%) in producing mortar and concrete. Although waste WSLP sludge does not possess pozzolanic properties and does not meet the criteria prescribed by the standards for application in mortar and concrete due to its chemical inertness and fineness, as well as its extended setting time, it can be used as a replacement for stone filler or other powdered mineral admixture in the production of self-compacting concrete (SCC) in amounts up to 100%, with a maximum quantity of up to 100 kg/m3. The obtained results indicate that with the appropriate conversion, waste sludges, despite representing hazardous waste, can be used as safe products in the construction industry; i.e., the waste material can become a useful and valuable raw material by applying (respecting) all of the principles of the green economy.

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“…As an alternative to the traditional methods of sludge disposal, energy recovery or incineration of the sludge can be used, and because of these processes activated sludge ash (ASA) is generated. Several studies have shown that ASA can be used as an additive in building materials such as cement-based materials [2][3][4]. Research has shown that the resulting ash that have high concentration of SiO2 and Al 2 O 3 [5], that could imply its pozzolanic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical properties of activated sludge ash as an additive in mortars

Seal,

Mery

2024

MATEC Web Conf.

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Wasted activated sludge is a by-product of the treatment of wastewater, that historically been considered a waste and disposed in landfill. This has resulted in the search for alternatives in its disposal and possible reuses of these wastes. This study focuses on the use of activated sludge ashes from wastewater treatment plants as an additive in mortars and the impact on its mechanical resistance. For this purpose, it was determined the physical and chemical properties of the ashes and the mechanical properties of different percentage of ash content used in the fabrication of mortar prisms. The physical-chemical properties were centred in the percentage of ash versus temperature and the pozzolanic characteristics of the ash generated. Therefore, the determination of the ash percentage by thermogravimetric analysis was performed. Two temperatures were employed in the generation of ash (550 ºC and 750 ºC) and measured its pozzolanic characteristics by a rapid determination of pozzolanic activity of materials method. As a result, the ash generated at a higher temperature had a stronger pozzolanic characteristics, than the ash generated at the temperature used for determining volatile content of the sludge. Afterwards, sludge was calcinated in presence of oxygen at 750 ºC, and the ash was used in the manufacture of mortar prisms. Due to the variation in the size of the particles generated in the calcination processed, it was proceeded to separate them into two sizes (mesh sieve Nº 4 and Nº 100). The percentage by weight of the ash employed in the fabrication of the prism were 0%, 5, 10 and 15%. The prisms were tested for flexure and compression at 10, 21 and 28 days, and compared with a standard mortar. With regards of the consistency of the mortar, it was observed that the addition of ash had an impact on this property. The greatest loss of consistency was observed with the 15% of ash content and mesh sieve Nº 4, decreasing by 26%, while the consistency of the mortar with 15% of ash content and mesh sieve Nº 100 decreased up to 16.6%. With regards of the mechanical properties, it was observed that the addition of ash as an additive for mortar, observing an increase in flexural strength of up to 11% at 28 days for the mixture of 10% ash content and mesh sieve Nº 4. In the case of compression, the resistance after 21 days of curing, increased by 82% for additions of 10% and 15% of ashes content for the mesh sieve Nº 100. Therefore, it is possible to use ashes from wasted sludge of activated sludge wastewater treatment plant as an additive in mortars, and this can be employed as an alternative to disposal in landfills.

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Physical, mechanical properties and durability of cement mortars containing fly ash from the sewage sludge incineration process

Cited by 19 publications

References 31 publications

Eco-Sustainable Magnesium Oxychloride Cement Pastes Containing Waste Ammonia Soda Residue and Fly Ash

Eco-Sustainable Magnesium Oxychloride Cement Pastes Containing Waste Ammonia Soda Residue and Fly Ash

Sustainable Application of Waste Sludges from the Wastewater Treatment Plant Generated during the Production of Heating Devices in the Construction Industry

Physicochemical properties of activated sludge ash as an additive in mortars

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