The effect of lime addition on weathering resistance and mechanical strength of gypsum plasters and renders

Elert, Kerstin; Alaminos, Ruben Alabarce; Benavides-Reyes, Cristina; Burgos-Ruiz, Miguel

doi:10.1016/j.cemconcomp.2023.105012

Cited by 6 publications

(2 citation statements)

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“…Another study [43] found the porosity of gypsum-lime mortars to range from 42 to 57%. This paper presents the results of testing gypsum-cement plasters containing a reduced amount of gypsum binder (30% by mass) intended for finishing works inside buildings.…”

Section: Methodsmentioning

confidence: 99%

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A Study of the Influence of Cement Addition and Humidity on the Mechanical Strength and Microstructure of Flue Gas Desulfurization Gypsum–Cement Plasters

Baran,

Hynowski,

Kotwica

et al. 2024

Materials

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Over the last 20 years, flue gas desulfurization gypsum (FGD gypsum) has become a valuable and widely used substitute for a natural raw material to produce plasters, mortars, and many other construction products. The essential advantages of FGD gypsum include its high purity and stability, which allow for better technical parameters compared to natural gypsum, and, until recently, its low price and easy availability. This FGD gypsum is obtained in the process of desulfurization of flue gases and waste gases in power plants, thermal power plants, refineries, etc., using fossil fuels such as coal or oil. The gradual reduction in energy production from fossil raw materials implemented by European Union countries until its complete cessation in 2049 in favor of renewable energy sources significantly affects the availability of synthetic gypsum, and forces producers of mortars and other construction products to look for new solutions. The gypsum content in commonly used light plaster mortars is usually from 50 to 60% by mass. This work presents the results of tests on mortars wherein the authors reduced the amount of gypsum to 30%, and, to meet the strength requirements specified in the EN 13279-1:2008 standard, added Portland cement in the amount of 6–12% by mass. Such a significant reduction in the content of synthetic gypsum will reduce this raw material’s consumption, thus extending its availability and developing other solutions. The study presented the test results on strength, density, porosity, pore size distribution, and changes in the microstructure of mortars during up to 180 days of maturation in conditions of increased relative humidity. The results show that decreased porosity and increased mechanical strength occur due to the densification of the microstructure caused by the formation of hydration products, such as C-S-H, ettringite, and thaumasite.

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Section: Methodsmentioning

confidence: 99%

“…The publication's authors observed a decrease in porosity over time for products with the addition of lime by approximately 10%, which was attributed to the carbonation process. Another study [43] found the porosity of gypsum-lime mortars to range from 42 to 57%.…”

Section: Introductionmentioning

confidence: 99%