Effect of Chemical Admixtures on Mechanical and Degradation Properties of Metallurgical Sludge Waste Concrete

Lehner, Petr; Horňáková, Marie; Pizoń, Jan; Gołaszewski, Jacek

doi:10.3390/ma15238287

Cited by 3 publications

References 17 publications

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Analysis of the Impact of Sludge and Slag Waste on the Basic Properties of Cement Mortars

Jura

2023

System Safety: Human - Technical Facility - Environment

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The article examined the influence of two additives, which are post-production waste from metallurgical processes, on the basic properties of cement mortars. Sludge and slag waste were used for testing. Both wastes were examined in terms of their chemical composition using a spectrometer, their specific density and grain composition were determined. As part of the tests, a series of standard mortars were made and the results obtained for modified mortars were compared to them. The produced cement composites used waste in amounts of 5, 10, 15 and 20% of the cement mass, used as a substitute for standard sand. After preparing the standard mortar and mortars containing additives for each series, consistency tests were performed using the flow table method. After an appropriate maturing time, flexural and compression tests were performed for all mortar series after 7 and 28 days of maturing, as well as water absorption tests. The research shows that the addition of these two wastes thickens the fresh cement mortar (from 0.62 to 15 %). The use of such waste also results in a decrease in flexural strength after 7 and 28 days (for sludge from 5 to 21% and for slag from 2 to 11%). Natomiast wytrzymałość na ściskanie zapraw zmalała o 11% w przypadku dodatku 20% szlamu oraz niemal taka sama co zaprawy normowej po dodaniu 20% żużla.

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Analysis of the Impact of Sludge and Slag Waste on the Basic Properties of Cement Mortars

Jura

2023

System Safety: Human - Technical Facility - Environment

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Fresh, Mechanical, and Thermal Properties of Cement Composites Containing Recycled Foam Concrete as Partial Replacement of Cement and Fine Aggregate

Pizoń

2023

Materials

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The research presented in this article was conducted to evaluate the suitability of recycled foam concrete (RFC) as an ingredient in newly created cement mortars. The basis for an analysis was the assumption that the waste is collected selectively after separation from other waste generated during demolition. The motivation for the research and its main problem is a comparison of the performance of RFC used in various forms. RFC was used in two forms: (1) recycled foam concrete dust (RFCD) as a 25 and 50% replacement of cement, and (2) recycled foam concrete fine aggregate (RFCA) as a 10, 20, and 30% replacement of sand. The basic properties of fresh and hardened mortars were determined: consistency, density, initial setting time, absorbability, compressive strength, thermal conductivity coefficient, and heat capacity. Research is complemented with SEM observations. The properties of fresh mortars and mechanical parameters were decreased with the usage of any dosage of RFC in any form, but the thermal properties were improved. The required superplasticizer amount for proper consistency was raised four times for replacing cement with 50% of RFCD than for 25% of such replacement. The mix density dropped by about 8% and 9% for mortars with the replacement of 50% cement by RFCD and 30% sand by RFCA in comparison to reference mortar. A 30% decrease in initial setting time was observed for cement replacement. In the case of sand replacement, it was the opposite—an increase of 100%. The dry density decreased by about 14% and 11% for mortars with the replacement of 50% cement by RFCD and 30% sand by RFCA in comparison to reference mortar. Absorbability was raised by about two times after replacement with both RFCD and RFCA. Compressive strength after 28 days dropped significantly by 75% and 60%, and the thermal conductivity coefficient decreased by 20% and 50% with 50% RFCD added instead of cement and 30% RFCA replacing sand. It indicates greater efficiency in thermomechanical means from RFCA in comparison to RFCD. This material can be used especially in the production of plaster and masonry mortar. Linear correlations of dry density and thermal conductivity coefficient and the latter and compressive strength were proven as reliable for RFCD replacement of cement and RFCA replacement of sand in mortars with greater w/c ratio.

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Environmental Benefits of Managing Secondary Waste From Incineration Plant in Concrete - Carbon Footprint and Abiotic Depletion.

Poranek,

Lazniewska-Piekarczyk,

ikon

2023

SGEM International Multidisciplinary Scientific GeoConference� EXPO Proceedings

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The use of secondary waste from municipal solid waste incineration plant in concrete has been studied for its potential to reduce the carbon footprint and abiotic depletion associated with traditional concrete production. Fly ash is a hazardous waste and it can be used as a substitute for cement in the production of concrete. Bottom ash can be used as a substitute for light natural aggregate, which was previously soaked in water for internal treatment of concrete. The composition of concrete includes: CEM I 42.5R, CSA, basalt, sand, zeolite, additives and admixtures. Studies have shown that concrete with secondary waste can decrease CO2 emissions and abiotic depletion compared to traditional concrete. In the article 4 scenarios are introduced (1 - concrete with fly ash, 2 - concrete with bottom ash, 3 - concrete with both secondary waste, 4 - reference concrete). The tests were performed for 1 kg of concrete, in the cradle-to-gate range, excluding transport. 4th scenario has the biggest carbon footprint and abiotic depletion influence. The least impact on environmental has 3rd scenario. Closing the loop by managing secondary waste in concrete fits into Circular Economy and Sustainable Development Goals, especially in SDG 12 � Responsible Consumption and Production and SDG13 � Climate Action.

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Effect of Chemical Admixtures on Mechanical and Degradation Properties of Metallurgical Sludge Waste Concrete

Cited by 3 publications

References 17 publications

Analysis of the Impact of Sludge and Slag Waste on the Basic Properties of Cement Mortars

Analysis of the Impact of Sludge and Slag Waste on the Basic Properties of Cement Mortars

Fresh, Mechanical, and Thermal Properties of Cement Composites Containing Recycled Foam Concrete as Partial Replacement of Cement and Fine Aggregate

Environmental Benefits of Managing Secondary Waste From Incineration Plant in Concrete - Carbon Footprint and Abiotic Depletion.

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