Study of the Impact of Microstructure and Sorption Properties of the Renovation Plasters on the Wall Drying Rate

Brachaczek, Wacław

doi:10.3311/ppci.11822

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…Priming plaster 1, in which the capillary active pores prevail, is intended for humid substrates of low salt load. Building materials consisting of walls with a low sorption coefficient are slower to absorb water, and if they become damp, harder to release it [13]. As shown in the porosimetric studies, building materials from the walls of buildings 1, 4 and 5 were characterized by a narrow range of diameters of pores, whose size did not exceed 10 μm.…”

Section: Selection Of Wall Drying Technology and Its Implementationmentioning

confidence: 83%

The impact of renovation plasters on desalting and drying of damp walls

Brachaczek

2018

E3S Web Conf.

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Abstract. Renovation plasters have been used in the construction industry since the early 1970s. Although the benefits they offer are obvious, there were also critical opinions about the adverse effect of the plasters on the durability of the walls. The complaints mainly concerned the tendency of renovation plasters to accumulate water in the wall, which in the winter time resulted in peeling of the plasters. As a result, more and more often conservators began to refrain from applying renovation plasters in historic buildings in favour of lime plasters without the porosity-increasing additions. The article presents an analysis of the walls which can be encountered in the renovation practice. For selected buildings undergoing renovation, the moisture content of walls, their strength, microstructure and water sorption were determined. Renovation plasters, whose microstructure and properties matched the properties of the walls, were used for their renovation. Plasters with optimal microstructure enabled salt accumulation, crystallized salts did not lower their durability and did not lead to cracking or peeling.

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Section: Selection Of Wall Drying Technology and Its Implementationmentioning

confidence: 83%

The impact of renovation plasters on desalting and drying of damp walls

Brachaczek

2018

E3S Web Conf.

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“…It was found that the response of mortar blends differs depending on the mechanism and attack factor, choice of an appropriate methodology for determining durability, and it depends on various factors, such as binder content, aggregate ratio, and binder to sand ratio. The research on the impact of the porosity structure of renovation plasters on salt crystallization as well as on the durability of these plasters was investigated in the works [27,28]. The findings demonstrated that the type of pore size and pores distribution in renovation plasters significantly influenced the speed of their drying and the crystallization of salts, and thus their durability.…”

Section: Crystallization Pressurementioning

confidence: 99%

Analysis of the Degradation Process of Sand-Lime Plasters Under the Impact of Crystallization Pressure

Ślusarek

Słomka-Słupik

Bochen

2023

Architecture, Civil Engineering, Environment

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A masonry basement wall was heavily dampened due to the lack of waterproofing in the ground contact area. Internal sand-lime wall plaster samples were subjected to chemical, physical and strength tests. The main phases of the damaged plaster were quartz and calcite. A measuring method of the tensile strength of plasters was proposed. A polar-symmetric deformation problem of a thick-walled spherical tank, allowing for the estimation of circumferential stresses in the spherical model was used for the analysis. It was found that the same values of porosity correspond to identical values of circumferential stresses, regardless of the values of the radii of the analyzed model. Thus the purpose of the presented research was to demonstrate that the mentioned dependence applied in the adopted model may be useful for the analysis of problems involving the resistance of internal plaster structure to the expansion caused by crystallization pressure.

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“…This phenomenon may be affected by such factors as stress caused by salt crystallization, as well as mismatching of plaster properties to the substrate. According to Brachaczek (2018b), a single type of renovation plaster with universal properties should not be used to renovate historic buildings. There is probably no such plaster available anyway.…”

Section: Technology and Materials Used In Renovation Workmentioning

confidence: 99%

“…The development of technologies and materials for the renovation of historic buildings with salted and damp walls was especially pronounced in restoring moisture barriers. The choice of a way of restoration of horizontal insulation depends on the structure of the walls, their thickness and, above all, their condition (Brachaczek, 2018b). The buildings have often been rebuilt many times over the centuries, and they have been modernized and renovated according to the knowledge and technology corresponding to the given era.…”

Section: Introductionmentioning

confidence: 99%