Selected Projects

At these projects, our products were successfully applied

Merlion, Singapur

The Merlion is the national symbol and the patron saint of the city-state of Singapore. The statue is depicted as a mythical creature with a lion head and a fish body. In the beginning of 2019, the statue was restored using our products.

Conservation:

Steam cleaning
Pre-treatment with CaLoSiL^® E25
Crack filling and surface treatment with CaLoSiL^® micro, CaLoXiL injection mortar, filler and repair mortar
Application of biocides
Additional consolidation with CaLoSiL^® E25 followed by silica acid esters

Executive company: Resto-Werkz PTE. LTD., Singapore

Consolidation of sandstone and other rocks - Merlion before

Consolidation of sandstone and other rocks - Merlion after

St. Augustine Statue, Warsaw, Poland

The statue can be visited at the Visitationist Church in Warsaw. The church is one of the most important sacred buildings of the 18^th century. The enormous damage on the statue was mainly caused by weathering and previously, inappropriately performed conservation. The restoration took place in 2009 in context of the Stonecore project in close collaboration with IBZ-Salzchemie. Together with the royal emblem of John II, the statue served as trial project for our products. Because of the outstanding results of this project, the treatment of the whole frontage with our CaLoSiL^® products followed.

Conservation:

Mechanical cleaning of the paint coating and the spackling pastes from the stucco work surfaces
Mechanical removal of the technologically faulty cement and epoxy-based fillings
Removal of the corroded anchors and frames, simultaneous, preliminary reinforcement and gluing of the degraded original fabric
Dismantling of the loose elements of the stucco decoration
Structural reinforcement and consolidation of the weakened parts of the stucco work with CaLoSiL^® E25 injection
Stabilizing and gluing of movable objects of the stucco
Filling cavities and reconstruction of the missing forms
Final treatment of the surfaces

Executive company: Restauro, Poland

Consolidation of sandstone and other rocks - Augustin before

Consolidation of sandstone and other rocks - Augustin treatment

Consolidation of sandstone and other rocks - Augustin after

The Royal Coat of Arms of John II Casimir Vasa and Marie Louise Gonzaga, Warsaw, Poland

The royal coat of arms is located at the Visitationist Church in Warsaw as the St. Augustine Statue. The restauration took place in 2009 as part of the Stonecore project. Together with the royal emblem of John II, the statue served as trial project for our products. Because of the outstanding results of this project, the treatment of the whole frontage with our CaLoSiL^® products followed.

Conservation:

Mechanical cleaning of the paint coating and the spackling pastes from the stucco work surfaces
Mechanical removal of the technologically faulty cement and epoxy-based fillings
Removal of the corroded anchors and frames, simultaneous, preliminary reinforcement and gluing of the degraded original fabric
Dismantling of the loose elements of the stucco decoration
Structural reinforcement and consolidation of the weakened parts of the stucco work with CaLoSiL^® E25 injection
Stabilizing and gluing of movable objects of the stucco
Filling cavities and reconstruction of the missing forms
Final treatment of the surfaces

Executive company: Restauro, Poland

Restoration of stucco and monuments - coat of arms before

Restoration of stucco and monuments - coat of arms treatment

Restoration of stucco and monuments - coat of arms after

Clay ceiling with painting, Freiberg, Germany

The ceiling painting with decorative ornamental secco painting is located in a merchant’s house in Freiberg. It was exposed as part of a renovation project and the creation time is to be estimated at the 16^th century. The substrate is a thin lime plaster of lime slurry on a clay straw filling. The pigments of the paint as well as whole slices of the lime plaster detached very easily. The increased moisture during the renovation also resulted in mold growth

Conservation:

Consolidation of the painting with CaLoSiL^® E5
Reduction of the mold growth and drying of the wall with CaLoSiL^® E5
Stabilizing and gluing of loose slices of plaster
Filling of missing parts with lime slurry

Executive company: Restorer S. Trömmer, Weilburg, Germany

Wall painting and monument restoration with Calosil and nano lime - Freiberg after

Wall painting and monument restoration with Calosil and nano lime - Freiberg before

Selected cooperation projects

2017 - 2019

ZIM – Development of novel materials and material combinations for conservation of plaster, mortar and stone as well as preventive conservation

2017 - 2019

SAB – Extension of the toolbox system for reconstruction of stone, plaster and mortar

2012 - 2014

ZIM – Development of novel materials for stabilization and conservation of murals and plaster, especially for salt and moisture containing, as well as differently absorbing surfaces

2008 - 2011

STONECORE – Conservation of stone for the preservation of buildings, development and application of nanomaterials for conservation and restoration of natural and artificial stone

Selected Literature of the topic of nanolime

Ziegenbalg, G., Drdácký, M., Dietze, C., Schuch, D. (editors)

Nanomaterials in Architecture and Art Conservation, Pan Stanford Publishing 2018, ISBN 978-981-4800-26-6.
Ziegenbalg, G. und Dietze, C.

Nanokalk in der Restaurierung: Möglichkeiten, Grenzen und Erfahrungen beim Einsatz feindisperser Calciumhydroxid-Sole, Musem Aktuell 266 (2020), 25-31.
Frohberg, B. und Dietze, C.

Festigung von Renaissancebauteilen aus Gotländer-Sandstein in der Dorfkirche Semlow, Steinkonservierung 2020, 25-37.
Niedoba, K., Sližková, Z, Frankeová, D. Nunes, C.L., Jandejsek, I.

Modifying the consolidation Depth of nanolime on Maastrich limestone, Construction and Building, Materials 133 (2017) 51-56.
Rodriguez-Navarro, C. and Ruiz-Agudo, E.

Nanolimes: from synthesis to application, Pure Appl. Chem., 2017, 2-28.
Vojtĕchovský, J.

Surface consolidation of wall paintings using lime nano-suspensions, Acta Polytechnica 57(2): 139-148, 2017.
C. Rodriguez-Navarro, K. Elert, R. Ševcik

Amorphous and crystalline calcium carbonate phases during carbonation of nanolimes: Implications in heritage conservation, CrystEngComm. 18, 6594-6607, 2016.
Sližková, Z., Bayer, K., Weber, J., (Hrsg.)

Nanolith, Konservierung von Leithakalken auf Basis von Calciumhydroxid-Nanopartikeln, Ústav teoretické a aplikované mechaniky AV ČR v. v. i., Praha, 2016.
Dähne, A.; Herm, C.

Calcium hydroxide nanosols for the consolidation of porous building materials – results from EU-Stonecore, Heritage Science 2013, 1:11.
Michalcova and Nedela and Tribulova and Durovic and Slouf

Utilization of Ca(OH)₂ Nanoparticles in paper deacidification, 2012, Nanocon 2012.