X-Ray Diffraction Stury of Hardening Kinetics of Natural Hydraulic Lime

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F19%3A00340636" target="_blank" >RIV/68407700:21110/19:00340636 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21720/19:00340636

Výsledek na webu

<a href="https://doi.org/10.5593/sgem2019V/6.3/S09.049" target="_blank" >https://doi.org/10.5593/sgem2019V/6.3/S09.049</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5593/sgem2019V/6.3/S09.049" target="_blank" >10.5593/sgem2019V/6.3/S09.049</a>

Jazyk výsledku

angličtina

Název v původním jazyce

X-Ray Diffraction Stury of Hardening Kinetics of Natural Hydraulic Lime

Popis výsledku v původním jazyce

Natural hydraulic lime (NHL) belongs to traditional binders used in civil engineering for centuries. Hydraulic lime (both natural or artificial) may be considered as binder which properties represents a transition between air lime (pure CaO or Ca(OH)2) and Portland cement (PC). It means that NHL contains hydraulic compounds (as PC) and CaO/Ca(OH)2. NHL 3.5 used in this study contained 50% of Ca(OH)2 and 40% of hydraulic components (belite C2S and tri-calcium-aluminate C3A). The rest were inactive compounds. The hardening process in NHL based materials thus involves both hydraulic reaction of C2S and C3A, and carbonation of Ca(OH)2. The current utilization of NHL in building practice is found nearly entirely in renovation works of architectural heritage but it might be – thanks to the above mentioned lower energy consumption compared to PC – attractive also in construction of sustainable buildings as a binder in mortars and plasters. The plasticity and durability of such NHL based mortars can be improved by a traditional admixture – linseed oil. This admixture act as water repellent and thus it is not just reducing the sorptivity of the mortar. The present paper deals with influence of linseed oil on hydration/carbonation kinetics of NHL mortar. These processes were monitored by help of X-ray diffraction, accompanied with compressive strength and pore size distribution measurement. It was found that presence of water repealing admixture reduces the rate of hydraulic reaction and carbonation since water is inevitably involved in these processes and consequently the strength increase is slower in the mortar containing linseed oil. The retarding effect was quantified by help of rate constant of modified Jander’s equation.

Název v anglickém jazyce

X-Ray Diffraction Stury of Hardening Kinetics of Natural Hydraulic Lime

Popis výsledku anglicky

Natural hydraulic lime (NHL) belongs to traditional binders used in civil engineering for centuries. Hydraulic lime (both natural or artificial) may be considered as binder which properties represents a transition between air lime (pure CaO or Ca(OH)2) and Portland cement (PC). It means that NHL contains hydraulic compounds (as PC) and CaO/Ca(OH)2. NHL 3.5 used in this study contained 50% of Ca(OH)2 and 40% of hydraulic components (belite C2S and tri-calcium-aluminate C3A). The rest were inactive compounds. The hardening process in NHL based materials thus involves both hydraulic reaction of C2S and C3A, and carbonation of Ca(OH)2. The current utilization of NHL in building practice is found nearly entirely in renovation works of architectural heritage but it might be – thanks to the above mentioned lower energy consumption compared to PC – attractive also in construction of sustainable buildings as a binder in mortars and plasters. The plasticity and durability of such NHL based mortars can be improved by a traditional admixture – linseed oil. This admixture act as water repellent and thus it is not just reducing the sorptivity of the mortar. The present paper deals with influence of linseed oil on hydration/carbonation kinetics of NHL mortar. These processes were monitored by help of X-ray diffraction, accompanied with compressive strength and pore size distribution measurement. It was found that presence of water repealing admixture reduces the rate of hydraulic reaction and carbonation since water is inevitably involved in these processes and consequently the strength increase is slower in the mortar containing linseed oil. The retarding effect was quantified by help of rate constant of modified Jander’s equation.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA18-13525S" target="_blank" >GA18-13525S: Malty moderních mozaik pod drobnohledem - metody pro materiálovou charakterizaci a studium degradace</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

19th International Multidisplinary Scientific Geoconference SGEM 2019

ISBN

978-619-7408-99-7

ISSN

1314-2704

e-ISSN

—

Počet stran výsledku

8

Strana od-do

379-386

Název nakladatele

STEF92 Technology Ltd.

Místo vydání

Sofia

Místo konání akce

Vienna

Datum konání akce

9. 12. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—