Pozzolanic reactions of hydraulic lime mortar components

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F16%3A00463888" target="_blank" >RIV/68378297:_____/16:00463888 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Pozzolanic reactions of hydraulic lime mortar components

Popis výsledku v původním jazyce

Historic lime mortars are a complex multicomponent system in which the mineralogical and chemical composition changes over time. With age, hydraulic phases are converted by carbonation process to calcium carbonate and reactive silicon and aluminium oxides. The consolidation of lime mortars is usually based on bringing Ca(OH)2 into its matrix so pozzolanic reactions may take place. The aim of this study was to explore the pozzolanic potential of sand and degraded binder particles on the development of hydraulic phases, which could contribute to the improvement of the mortars´ mechanical strength and, therefore, prolong its durability. For this purpose, pastes of mortar components with lime hydrate were prepared and stored in wet conditions (99 1% RH, 301°C) for 180 days and the products resulting from the pozzolanic reaction were studied at different agesnusing thermal analysis (TG/DTG) and X-ray diffraction (XRD). The pozzolanic reaction between metakaolin and calcium hydroxide in solution was also studied in terms of change of electric conductivity and pH. The results obtained indicate that the pozzolanic reactivity of historic mortars’ components can be potentiated by supplying calcium hydroxide to its structure. The resulting pozzolanic products can contribute to the effective consolidation of mortars over long periods.

Název v anglickém jazyce

Pozzolanic reactions of hydraulic lime mortar components

Popis výsledku anglicky

Historic lime mortars are a complex multicomponent system in which the mineralogical and chemical composition changes over time. With age, hydraulic phases are converted by carbonation process to calcium carbonate and reactive silicon and aluminium oxides. The consolidation of lime mortars is usually based on bringing Ca(OH)2 into its matrix so pozzolanic reactions may take place. The aim of this study was to explore the pozzolanic potential of sand and degraded binder particles on the development of hydraulic phases, which could contribute to the improvement of the mortars´ mechanical strength and, therefore, prolong its durability. For this purpose, pastes of mortar components with lime hydrate were prepared and stored in wet conditions (99 1% RH, 301°C) for 180 days and the products resulting from the pozzolanic reaction were studied at different agesnusing thermal analysis (TG/DTG) and X-ray diffraction (XRD). The pozzolanic reaction between metakaolin and calcium hydroxide in solution was also studied in terms of change of electric conductivity and pH. The results obtained indicate that the pozzolanic reactivity of historic mortars’ components can be potentiated by supplying calcium hydroxide to its structure. The resulting pozzolanic products can contribute to the effective consolidation of mortars over long periods.

Druh

D - Stať ve sborníku

CEP obor

AL - Umění, architektura, kulturní dědictví

OECD FORD obor

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Projekt

<a href="/cs/project/GBP105%2F12%2FG059" target="_blank" >GBP105/12/G059: Kumulativní časově závislé procesy ve stavebních materiálech a konstrukcích</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 4th Historic Mortars Conference - HMC2016

ISBN

978-960-99922-3-7

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

761-768

Název nakladatele

Laboratory of Building Materials Department of Civil Engineering Aristotle University of Thessaloniki

Místo vydání

Thessaloniki

Místo konání akce

Santorini

Datum konání akce

10. 10. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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