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Tehnološki fakultet  Novi Sad, Univerzitet u Novom Sadu

Metodologija ispitivanja istorijskih maltera 

Manual for the Laboratory Research of Historical Mortars 

Snežana Vučetić, Jonjua Ranogajec

Iz Predgovora

 

Ova knjiga je koncipirana tako da definiše osnovne termine i korake koje je neophodno sprovesti da bi se uradila kvalitetna karakterizacija istorijskih maltera. Knjiga je pre svega namenjena studentima Tehnološkog fakulteta, Katedre za inženjerstvo materijala, Arhitektonskog i Hemijskog fakulteta, ali i svim učesnicima uključenim u proces zaštite nepokretnog kulturnog nasleđa.

Knjiga je osmišljena tako da predstavlja svojevrsnu vrstu vodiča za ispitivanje istorijskih maltera od trenutka kada se istraživač nađe ispred objekta koji je predmet ispitivanja, prolazi sa njim sve faze procesa istraživanja, sve do momenta dobijanja i interpretacije rezultata. U knjizi su detaljno definisani sledeći postupci: metodologija dijagnostike stanja, in-situ ispitivanja, uzorkovanje, laboratorijska ispitivanja, interpretacije rezultata, mogućnosti korišćenja dobijenih rezultata i pregled aktuelne literature drugih istraživačkih grupa. Ovi postupci definisani su i prikazani kroz primere koji su rezultat naučnog projekta MoDeCo2000: „Dizajn maltera za konzervaciju – rimska granica na Dunavu 2000 godina kasnijeˮ (Mortar Design for Conservation – Danube Roman Frontier 2000 Years after), finansiranog kroz program PROMIS od strane Fonda za nauku Republike Srbije.

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 Talanta, Volume 252, 15 January 2023, 123844

https://doi.org/10.1016/j.talanta.2022.123844

Fired pressed pellet as a sample preparation technique of choice for an energy dispersive X-ray fluorescence analysis of raw clays 

Nevenka Mijatović, Milica Vasić, Ljiljana Miličić, Milena Radomirović, Zagorka Radojević

In this paper, the main subject concerns comparing different techniques to prepare raw clay samples for energy-dispersive X-ray fluorescence spectrometry (EDXRF). Three kinds of sample preparation procedures are examined, such as loose powder, pressed pellet, and fired pressed pellet. The fired pressed pellet approach was observed as a part of universal sample preparation for physic, mechanical, and instrumental analysis, which has not been previously tested as a solution in chemical analysis by the EDXRF method. The observed sample preparation techniques were compared by calculating the parameters of validation (recoveries, limit of detection - LOD, limit of quantification - LOQ, precision, and expanded uncertainties of measurements) of 11 elements (Si, Al, Fe, Ca, Mg, K, Na, Ti, P, Mn, and S) using 15 certified reference materials (CRMs). Calibration curves were created and evaluated using 30 reference materials (RM) for all three approaches. Results proved that the fired pressed pellet is the most practical and precise approach for sample preparation of raw clays.

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Materials 2023, 16(2), 642 

 https://doi.org/10.3390/ma16020642

Bio-stimulated surface healing of historical and compatible conservation mortars 

The main focus of this research was the bio-stimulated healing of cracks in lime mortar samples (historical and newly designed). The investigation started from comprehensive characterisation of historical mortars, while in the next stage a compatible conservation mortar was designed and characterised, with special attention given to the contact zone formation between original and conservation mortars. The next step was the design of a bio-stimulating crack-sealing agent, a two-component liquid system: bacteria culture Sporosarcina pasteurii DSM 33 and nutrients. Both historical and conservation mortar samples were used in order to study their potentials for bio-stimulated surface-crack repair. The experiment lasted for 150 days, allowing the ureolytic bacteria Sporosarcina pasteurii DSM 33 to induce the precipitation of calcium carbonate into cracks and heal the damaged surface of the tested materials. The healing phenomenon was continuously monitored during a period of 150 days. Special attention was given to the evaluation of the morphology, chemical and structural characteristics of the deposits created in/on the surface cracks, monitored by optical microscopy, SEM, XRF and XRD analyses. The obtained results present valuable input for the application of the developed system in real environmental conditions as a solution for the future sustainable architectural conservation of traditionally prepared mortars.

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Гласник Друштва конзерватора Србије 45 (2021) 


Дизајн малтера за конзервацију - Римска граница на Дунаву 2000 година касније. Научно-истраживачки пројекат МoDeCo2000 

Дизajн мaлтeрa зa кoнзeрвaциjу – Римскa грaницa нa Дунaву 2000 гoдинa кaсниje (Mortar Design for Conservation – Danube Roman Frontier 2000 Years After: MoDeCo2000) je нaучнoистрaживaчки прojeкaт у чиjeм су фoкусу истрaживaњa римских мaлтeрa кojи пoтичу из грaђeвинa вojних утврђeњa и нaсeљa нa подручју дунaвскoг лимeсa нa тeритoриjи дaнaшњe Рeпубликe Србиje. Нoсилaц прojeктa je Aрхeoлoшки институт (др Eмилиja Никoлић – рукoвoдилaц прojeктa и др Mлaдeн Joвичић) a спрoвoди гa зajeднo сa Teхнoлoшким фaкултeтoм Унивeрзитeтa у Нoвoм Сaду (др Снeжaнa Вучeтић и др Joњaуa Рaнoгajeц) и Институтoм зa испитивaњe мaтeриjaлa, Бeoгрaд (Љиљaнa Mиличић и Ивaнa Дeлић Никoлић). Прojeкaт трaje oд 2020. дo 2022. гoдинe и финaнсирa сe из прoгрaмa ПРOMИС, Фoндa зa нaуку Рeпубликe Србиje.

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Preprints 2023, 2023010157

doi: 10.20944/preprints202301.0157.v1

Recycling and reuse of building materials in a historical landscape.

Viminacium natural brick (Serbia) 

During the MoDeCo2000 scientific and research project on mortars used in the territory of the Roman Danube Limes in Serbia, the biggest challenge was the quest for the provenance of used raw materials. The area where the largest city in the province of Moesia Superior developed, with millennial continuity of land use and settlement, was selected as a case study for deeper research. The material and immaterial values of Roman Viminacium have survived in the later life of the landscape, through the preserved building remains and artifacts, secondary use of building materials, but also toponyms, customs, and stories. Recycling of materials is commonly recognised in the modern age as the industrial processing of existing products in order to obtain raw materials and later prepare new products, representing one of the basic elements of sustainability. However, people throughout history have always used what they had at hand and the building remains were reused, but also recycled for new constructions. In this study we follow the presence of the specific material we call natural brick in the historical Viminacium landscape, focusing on Roman construction and specifically its potential use in lime mortars, connecting humanistic and natural sciences.

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Design of conservation mortars for architectural heritage is always an ambitious and inspiring task, asking for many diverse requirements to be successfully harmonised. Principally, conservation mortars need to comply with demanding chemical, mineralogical, textural, and mechanical compatibility criteria. The main aim of this paper is to show the design and development of compatible mortars for conservation of a late Roman tomb in Serbia, situated around the former Danube Limes. It is only a fragment of the MoDeCo2000 project which deals with the research of mortars from the archaeological sites along the Limes, dated to the period from the first to the sixth centuries. Laboratory activities for the sampled mortars included visual observations, stereo-optical and digital microscopy, spectrophotometry and colourimetry, mineralogical and petrographic analyses, physical–mechanical tests, thermal characterisation, mechanical and chemical separation of aggregates and binders, and characterisation of samples, binders, and aggregates using FTIR, Raman, XRF, and XRD. The obtained results enabled designing of conservation mortars mixtures based on local raw materials. Following laboratory preparation of mortar models and several cycles of mixtures optimisation, the newly developed mortars for the Roman tomb were artificially aged and compared with original samples. The models which successfully fulfilled requirements qualified for application on small test areas of the historical building, and their behaviour was closely monitored in situ. The promising research results directly led to production of compatible mortars for upcoming conservation actions on the Danube Limes in Serbia and contributed to the universal body of knowledge about Roman mortars and architecture.

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The dust that a building is transformed into when it becomes a ruin holds precious traces of the past. The hands of an archaeologist will search through it patiently, and find a necklace bead of a woman that lived in it. The hands of an architect will virtually transform the dust into a mortar, brick, or stone. The first profession sees through the unbuilt. The second one builds from it. However, both perform their work by communicating with the sciences.  Throughout history, various components were chosen, measured, and mixed into one of the most complex building composites ever - mortar, whose re-creation is of invaluable importance for architectural conservation. Geologists and chemists will best tell us about its composition. However, sometimes, while excavating a ruined wall, an archaeologist finds a mortar trowel, accidentally left by the past builder. Is this a more valuable trace for revealing the creation of a wall than the binder/aggregate ratio of the mortar used? Can we pick it up and imagine the hands that combined colourful aggregate grains with the earth, gypsum, lime, or cement?  From the exploitation, transport, and use of raw materials, to the product called mortar, we pass by the people from the past, the quarries, roads, and rivers, we look at the craftsmen working with tools, and observe the investors negotiating with engineers, and the rulers supervising the construction. The four hands from the beginning of the story can combine the chemistry of the red, blue, green, yellow, black, and white mineral grains with the found trowel, and help us revive many unknown hands from the past. Thus, the research of historic mortars for conservation purposes must not be a purely technical process. Only by understanding the multiple values of a historic building, we can adequately protect it. The project Mortar Design for Conservation – Danube Roman Frontier 2,000 Years After (MoDeCo2000), funded by the Science Fund of the Republic of Serbia, was created with the sincere intent and great hope that it could help in the future discoveries and preservation of the rich heritage in Serbia from the period of the magnificent Roman Empire, whose Danubian monuments are part of the preliminary list for UNESCO World Heritage. Different researchers and professionals - architects, archaeologists, geologists, chemists, materials scientists, physicists, biologists, restorers, craftsmen, and managers have all made an effort to get closer to the fulfillment of the wish of the project creators.  After sampling and investigating numerous mortars originating from the structures dating to the period from the 1st to the 6th century, many conclusions were made, but challenges for future researchers and conservators also arose, telling us we need to continue our work in the future, in an attempt to gain more knowledge and, thus, preserve our heritage more adequately. We welcome you to the Viminacium Archaeological Park and the 1st International Conference with Workshop, Science for Conservation of the Danube Limes. With the hope that many new fruitful collaborations between our guest researchers will be developed on this occasion, taking us one step further towards long-term technical solutions for architectural conservation and civil engineering based on nature, but also to new cognitions about the life of the past people, always for the cause of the preservation of rich world material and immaterial cultural heritage and our planet, we invite you to peruse this publication. All the authors have shown their enormous affection and passionate devotion towards the discoveries of ancient knowledge, advocating its use in the further preservation of the most monumental physical witnesses of the past – buildings, for future generations.

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