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Making decision on repointing of clay brick facades on the basis of moisture content and water absorption tests results – a review of assessment methods
Published in Jan Kubica, Arkadiusz Kwiecień, Łukasz Bednarz, Brick and Block Masonry - From Historical to Sustainable Masonry, 2020
S.K. Shahreza, M. Molnár, J. Niklewski, I. Björnsson, T. Gustavsson
The focus in this paper is on the repointing of mortar joints, since it is an intrusive and costly maintenance measure. A common argument for repointing is that the erosion of mortar joints facilitates water up-take in facades exposed to WDR (Fried et al., 2014). Further, erosion of mortar joints is, at least in the Nordic countries, regarded as detrimental from an aesthetic point of view, since it creates, seen superficially, the impression of poor technical condition of the building. Understanding that aging of clay brick facades can be perceived as an aesthetic value, e.g. through exposure of fossil shells in the surface of the mortar joints, is generally poor (Tägil et al., 2011).
A Digital-based Integrated Methodology for the Preventive Conservation of Cultural Heritage: The Experience of HeritageCare Project
Published in International Journal of Architectural Heritage, 2021
M.G. Masciotta, M.J. Morais, L.F. Ramos, D.V. Oliveira, L. J. Sánchez-Aparicio, D. González-Aguilera
Apart from the presence of biological growth, particularly lichens, on the stone battlement and roof tiles, the condition survey revealed problems of humidity due to water infiltrations through the roof covering, walls and opening frames, likely imputable to an insufficient slope of the roof drainage system and clogged gutters, loss of mortar between masonry units and lack of adequate waterproofing membranes in the windows, respectively. Ongoing stone disintegration phenomena originated from the use of lime-cement mortar in previous repointing works were also observed in the South-East façade. Moreover, structural superficial cracks worth of further diagnostic investigations were detected on the ground floor bearing walls perpendicular to the South-West façade.
A New Methodology for the Survey and Evaluation of Seismic Damage and Vulnerability Entailed by Structural Interventions on Masonry Buildings: Validation on the Town of Castelsantangelo sul Nera (MC), Italy
Published in International Journal of Architectural Heritage, 2022
Marco Vettore, Ylenia Saretta, Luca Sbrogiò, Maria Rosa Valluzzi
Lightweight interventions are so classified for their limited altering capability, and they may concern both the masonry and the connections (Figure 17). They are mainly: tie rods (TR), deep repointing (DR), thick cementitious plaster (TCP); grout or mortar injections have a more altering capability but they have not been observed. The effectiveness of tie rods depends on masonry quality (Cangi 2012), while repointing and plasters, provided they are well executed, contribute to avoid the disintegration of the walls, as already stated by Gavarini (1983). Poor design and/or workmanship with such interventions may led to: a) unidirectional ties (U-TR); b) incomplete or failed injections signalled by grout leakages on external stones (F-IN).
Discoveries and Dilemmas—Excavating the Serridge Engine House (c1790)
Published in The International Journal for the History of Engineering & Technology, 2020
David Hardwick, Steve Grudgings
The original intention was to record the site before it was lost. The discovery of significant below ground remains combined with a willing owner enabled a revised approach where both preservation and continued access was possible. The only historic surface feature visible is the original arch, which has now been conserved by repointing with lime mortar. Below ground stabilisation and the construction of block and beam roofs has maintained access including to both levels of the engine house (Figures 10 and 11). At the landowners request and where necessary in consultation with the Coal Authority, secure access grilles have been fitted and an access agreement prepared between the landowners’ and Hades CC., who now control access on their behalf.