Cement Mortars with Addition of Fly Ash from Thermal Transformation of Sewage Sludge and Zeolite

Ogrodnik, Paweł; Rutkowska, Gabriela; Szulej, Jacek; Żółtowski, Mariusz; Powęzka, Aleksandra; Badyda, Artur

doi:10.3390/en15041399

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…An important practical application is the use of zeolites as sorbents [ 1 ]. In cement and concrete technologies, they are utilized as mineral raw materials for cement production and as mineral additives [ 3 , 4 , 5 , 6 , 7 , 8 ]. The use of zeolites as mineral additives is related to the acidic properties of zeolites, i.e., to the Brønsted and Lewis acid sites on their surfaces [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Ions Contained in Concrete Pore Solutions on Natural Zeolites

Czapik

2023

Materials

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This article investigates the relationships between different chemical compositions of simulated cement concrete pore solutions and changes on the surface of zeolite rock with potassium clinoptilolite as its main component. The changes were studied using X-ray diffraction (XRD), thermal analysis (DTA-TG) and scanning electron microscopy (SEM). Zeolite powder samples and a ground section of 16–64 mm grain were tested. The simulated pore solutions were based on Ca, Na, K hydroxides and K2SO4. It was found that 100% of Ca(OH)2 in the systems could react between 7 and 180 days of hydration due to pozzolanic and side reactions. As the degree of clinoptilolite conversion increased, it became more difficult to detect it in X-ray patterns. At the same time, various microstructural changes could be observed. As a result of the reactions that occurred, hydrated calcium silicates, sulfate and carbonate compounds were formed. Potassium hydroxide had a more substantial effect on clinoptilolite reactivity than sodium hydroxide. This effect can be enhanced by the presence of SO23− ions in the solution.

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Section: Introductionmentioning

confidence: 99%

The Impact of Ions Contained in Concrete Pore Solutions on Natural Zeolites

Czapik

2023

Materials

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“…The usage of the SSFA additive has benefits as well as drawbacks, such as its decreased pozzolanic activity, which results in a reduction in strength qualities and an increase in water consumption, although these drawbacks can be offset by grinding, appropriate modification, and treatment. Another limitation is the lower reactivity of these materials compared to cement flour [28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Modification of Concrete Composition Doped by Sewage Sludge Fly Ash and Its Effect on Compressive Strength

Kalak,

Szypura,

Cierpiszewski

et al. 2023

Materials

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The sustainable development of construction materials is an essential aspect of current worldwide trends. Reusing post-production waste in the building industry has numerous positive effects on the environment. Since concrete is one of the materials that people manufacture and use the most, it will continue to be an integral element of the surrounding reality. In this study, the relationship between the individual components and parameters of concrete and its compressive strength properties was assessed. In the experimental works, concrete mixes with different contents of sand, gravel, Portland cement CEM II/B-S 42.5 N, water, superplasticizer, air-entraining admixture, and fly ash from the thermal conversion of municipal sewage sludge (SSFA) were designed. According to legal requirements in the European Union, SSFA waste from the sewage sludge incineration process in a fluidized bed furnace should not be stored in landfills but processed in various ways. Unfortunately, its generated amounts are too large, so new management technologies should be sought. During the experimental work, the compressive strength of concrete samples of various classes, namely, C8/10, C12/15, C16/20, C20/25, C25/30, C30/37, and C35/45, were measured. The higher-class concrete samples that were used, the greater the compressive strength obtained, ranging from 13.7 to 55.2 MPa. A correlation analysis was carried out between the mechanical strength of waste-modified concretes and the composition of concrete mixes (the amount of sand and gravel, cement, and FA), as well as the water-to-cement ratio and the sand point. No negative effect of the addition of SSFA on the strength of concrete samples was demonstrated, which translates into economic and environmental benefits.

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Effect of cenospheres on the proprieties of plain concrete exposed to elevated temperature

Gabriela,

Paweł,

Aleksandra

et al. 2024

Clean Techn Environ Policy

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The main objective of the study was to determine the effect of the use of cenospheres for C30/37 class concretes used in construction and road construction. As part of the research, four concrete mixtures were designed: three with the addition of cenospheres and one reference mixture, without the additive. In the three modified mixtures, 20, 40 and 60% of fine aggregate were replaced by cenospheres, respectively. Selected features of the mixtures were determined—consistency and density, as well as the strength properties of concrete. Strength tests were carried out after 28 and 56 days of maturation. Experimental tests of concrete after initial thermal treatment were also carried out at three selected temperatures: 300, 500 and 700 °C, with loading times ranging from 60 to 180 min. These times were selected in such a way that the samples could be heated in their entire volume. A separate group of experimental studies was microstructure studies, the aim of which was to assess the changes occurring in concrete under the influence of high temperatures and to try to justify why CS-I concrete containing cenospheres in the amount of 20% of concrete subjected to annealing at 300 °C has a higher compressive strength than the corresponding reference concrete. The negative influence of cenospheres on the strength of concrete after initial thermal treatment was unequivocally demonstrated. An increase in the amount of cenospheres causes a decrease in compressive strength. A similar negative relationship was also demonstrated in the case of non-heat-treated samples. Graphical Abstract

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Cement Mortars with Addition of Fly Ash from Thermal Transformation of Sewage Sludge and Zeolite

Cited by 3 publications

References 27 publications

The Impact of Ions Contained in Concrete Pore Solutions on Natural Zeolites

The Impact of Ions Contained in Concrete Pore Solutions on Natural Zeolites

Modification of Concrete Composition Doped by Sewage Sludge Fly Ash and Its Effect on Compressive Strength

Effect of cenospheres on the proprieties of plain concrete exposed to elevated temperature

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