Alkaline Activity of Portland Cement with Additives of Waste Glass

Self Cite

The main building materials widely used worldwide are those based on cement, glass, and ceramics. Taking into account the fact that the raw material base for the production of these materials is narrowing, and the quality of raw materials is declining, methods are being used to modify the structure of silicate materials in order to improve their properties when using cheaper raw materials and industrial waste, which should help reduce the energy intensity of their production. One of the ways to reduce energy consumption is the use of alkaline components in the chemical composition of silicate materials, which makes it possible to reduce the temperature of their synthesis. However, the presence of alkalis in the material at the stage of the operation is undesirable since it contributes, for example, to a decrease in the chemical resistance of silicate glasses or leads to the phenomenon of alkaline corrosion in cement products. In this regard, in order to reduce the negative impact of alkalis, it is necessary to extract them from the surface layers of the silicate material. There are various methods for extracting alkalis from silicate materials, some of which are presented in this article.

Section: Glass Water Glass Solutionmentioning

confidence: 99%

“…Considering the fact that the alkaline activity of Portland cement, as a representative crystalline silicate system, is limited by the relevant standards, the addition of powdered glass waste to the cement leads to an excess alkali content of the cement-glass mixture [17].…”

Section: Introductionmentioning

confidence: 99%

Extraction of Alkalis from Silicate Materials Part 1—Amorphous Silicate Materials

Szewczenko¹

2022

Self Cite

“…At present, more and more ways to reduce the amount of waste, as well as methods to reuse it in accordance with the principles of sustainable development, are being sought. There are many publications concerning the use of glass as an aggregate or non-clinker component for cement [5][6][7][8][9][10][11][12][13]. The use of glass as an aggregate for mortar or concrete reduces the strength of the obtained products as a result of the reduction in the adhesion between the slurry and the glass aggregate.…”

Section: Introductionmentioning

confidence: 99%

Properties of Geopolymers Based on Metakaolin and Soda-Lime Waste Glass

Kotsay,

Grabowski

2023

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The paper determines the properties of geopolymer pastes based on metakaolin and soda-lime waste glass. The density, alkaline activity, strength and microstructure of the reference geopolymer, as well as geopolymers with a 10%, 30% and 50% soda-lime waste glass content instead of metakaolin, were tested. The experimental results indicate that the properties of the geopolymers with waste glass largely depend on the ratio of the liquid to solid substance. Increasing the content of waste glass causes an increase in the fluidity of the geopolymer paste, which in turn allows the amount of water glass, i.e., an activator during the obtaining of geopolymers, to be reduced. On the basis of the conducted tests, it was found that the strength of geopolymers can be increased by adding up to 50% of soda-lime waste glass instead of metakaolin and by having a lower content of water glass.

“…In the last 20 years, relatively many studies have appeared on the use of glass waste as additives for Portland cement [17][18][19][20][21][22][23][24]. Container glass of various chemical compositions is most often used: colorless, green, and brown.…”

Section: Introductionmentioning

confidence: 99%

Influence of Water Glass Introduction Methods on Selected Properties of Portland Cement

Szewczenko

Kotsay

2021

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This article presents a study of the effect of water glass and its introduction on the hydration of Portland cement and its properties in plastic and solid states. The introduction of sodium water glass into the mixing water extends the setting time of Portland cement by 35%, while introduction into the cement paste reduces it by 24.4%; for potassium water glass, the respective values are 10.8% and 10.8%. The introduction of sodium water glass into the mixing water decreases its consistency by 17.6%; its introduction into the cement paste reduces its consistency by 97%. Based on microcalorimetric studies and using the modelling method, mechanisms of the processes occurring in the cement paste, for various methods of introducing water glass admixtures, and their influence on the properties of cement are proposed. The important implications of the obtained results are that, using various methods for introducing admixtures of water glass, it is possible to regulate the setting of cement slurries within significant limits that are important during their transportation.