Consolidation of renders and plasters

Hees, Rob van; Veiga, Rosário; Slížková, Zuzana

doi:10.1617/s11527-016-0894-5

Cited by 43 publications

(23 citation statements)

References 17 publications

(21 reference statements)

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“…Only small macroscopic aggregates could be observed on the lowest pore stone surfaces at high magnifications without generating the homogenous white haze discussed by other authors [31,53]. Any remarkable modification of the stone surface was observed in SEM images.…”

Section: Discussionmentioning

confidence: 58%

Basic Protocol for On-Site Testing Consolidant Nanoparticles on Stone Cultural Heritage

2019

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Currently the application of consolidants based on nanoparticles is common practice among restorers. Consolidants should not modify the properties of original materials according to international recommendation, which requires previous studies to decide the optimal option. The selection must be based on empirical results, and not only in the expertise of the restorer, because the consolidant’s effectiveness is influenced by its own properties and other factors such as the characteristics of the artwork (elemental composition, porosity, texture, etc.) and its context (temperature, relative humidity, etc.). Moreover, new protocols must be sustainable and compatible with on-site restoration. A new protocol to test consolidant nanoparticles has been designed and assessed. This is based on easy trials and low-cost techniques—digital microscope, colorimeter, peeling test and ultrasound—that could be employed by restorers in situ. In this paper, different consolidant nanoparticles were tested on stones from two historical quarries. The first treatment was SiO2 nanoparticles, and the second, a new nanocomposite of Ca(OH)2 and ZnO quantum dots that allows us to measure penetration depth easily and discern the treated areas under UV lights. This second treatment was the best option for the studied stones, validating the protocol designed for the choice of consolidants.

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Section: Discussionmentioning

confidence: 58%

Basic Protocol for On-Site Testing Consolidant Nanoparticles on Stone Cultural Heritage

2019

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“…Such aspects are far from what a practitioner should be able to assess on-site, but represent levers through which researchers can try to improve consolidants. Regarding current field applications, it is nevertheless of vital importance to stress the need for preliminary testing in the laboratory, to correctly tune the properties of the chosen product for each specific stone substrate (see section 4) and decay profile [42].…”

Section: Adhesion and Crackingmentioning

confidence: 99%

“…The knowledge of these aspects can be used to narrow down the list of suitable treatments [9,42]. For some problems, however, an answer may not yet exist.…”

Section: The Importance Of Preliminary Assessmentsmentioning

confidence: 99%

Stone consolidation: a critical discussion of theoretical insights and field practice

et al. 2020

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Stone consolidants have been extensively used for the preservation of historical structures since the 19th century. However, their true effectiveness in practice is often a source of debate, largely because of known cases where badly chosen treatments were unsuccessful, or even caused an accelerated degradation of the substrate. Researchers have therefore strived to better understand, and possibly predict, the behavior of consolidants on-site, in order to assist practitioners in their decision making. Despite the large number of publications available on the subject, however, the contribution of scientific research for practical applications remains scarce. Reasons for this include the limited accessibility of scientific publications and the lack of documentation or preparatory studies from the field. This unfortunately compromises the knowledge exchange between researchers and practitioners, which we consider to be a main challenge that this field must overcome. The target of this letter is to reconnect the critical problems identified on-site through practical experience with the conceptual research outcomes that could help solve them. For this, we present an informed evaluation of the most needed research, along with a synthetic overview of the insights that scientific research can offer in terms of consolidant selection, application and monitoring.

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“…The stone to be repaired should display adequate mechanical properties, in particular cohesion. Depending on, and according to the cultural value attributed to the structure, powdering parts can be removed by mechanical actions (cutting) and/or be consolidated [37,38]. Practical advice can be found in conservation literature [1].…”

Section: Preliminary Operations On the Substratementioning

confidence: 99%

Recommendation of RILEM TC 243-SGM: functional requirements for surface repair mortars for historic buildings

et al. 2019

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Consolidation of renders and plasters

Cited by 43 publications

References 17 publications

Basic Protocol for On-Site Testing Consolidant Nanoparticles on Stone Cultural Heritage

Basic Protocol for On-Site Testing Consolidant Nanoparticles on Stone Cultural Heritage

Stone consolidation: a critical discussion of theoretical insights and field practice

Recommendation of RILEM TC 243-SGM: functional requirements for surface repair mortars for historic buildings

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