Use of Fine-Ground Lava Sand as a Pozzolanic Additive in Aerial Lime-Based Mortars

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F22%3APU146341" target="_blank" >RIV/00216305:26110/22:PU146341 - 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

Use of Fine-Ground Lava Sand as a Pozzolanic Additive in Aerial Lime-Based Mortars

Popis výsledku v původním jazyce

Pozzolanic additives were historically used in the construction practice to ensure improved mechanical properties and durability of the predominantly aerial-lime based mortars for the highly-stressed applications such as bridges, piers etc. The paper addresses the use of fine-ground lava sand as pozzolanic additive in aerial lime-based mortars. The mortars with 10%, 20%, and 40% lime replaced by the ground lava sand are studied regarding their strength properties, microstructure, and durability to freezing-thawing cycles and salt crystallization. The incorporation of ground lava sand to the mortar mixture leads to increase in strength by up to 50% in later ages. The pozzolanic reaction of the ground lava sand and lime along with the decrease in amount of aerial lime and kneading water in the mixture results in more unimodal pore distribution with lower total porosity, thus also lower water intake under atmospheric pressure. This change in microstructure combined with increased strength leads to mortars with improved durability to both, salt crystallization and freeze-thaw cycles. The fine-ground lava sand is found to be a suitable additive for aerial lime-based mortars to enhance their performance in building practice or to prepare mortars imitating the feeble hydraulicity of limes used in the past in constructions nowadays considered built heritage.

Název v anglickém jazyce

Use of Fine-Ground Lava Sand as a Pozzolanic Additive in Aerial Lime-Based Mortars

Popis výsledku anglicky

Pozzolanic additives were historically used in the construction practice to ensure improved mechanical properties and durability of the predominantly aerial-lime based mortars for the highly-stressed applications such as bridges, piers etc. The paper addresses the use of fine-ground lava sand as pozzolanic additive in aerial lime-based mortars. The mortars with 10%, 20%, and 40% lime replaced by the ground lava sand are studied regarding their strength properties, microstructure, and durability to freezing-thawing cycles and salt crystallization. The incorporation of ground lava sand to the mortar mixture leads to increase in strength by up to 50% in later ages. The pozzolanic reaction of the ground lava sand and lime along with the decrease in amount of aerial lime and kneading water in the mixture results in more unimodal pore distribution with lower total porosity, thus also lower water intake under atmospheric pressure. This change in microstructure combined with increased strength leads to mortars with improved durability to both, salt crystallization and freeze-thaw cycles. The fine-ground lava sand is found to be a suitable additive for aerial lime-based mortars to enhance their performance in building practice or to prepare mortars imitating the feeble hydraulicity of limes used in the past in constructions nowadays considered built heritage.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA21-06582S" target="_blank" >GA21-06582S: Experimentální a počítačová analýza transportu, akumulace a krystalizace solí v nehydrofobizovaných omítkových maltách</a><br>

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název statě ve sborníku

Book of Articles of 9th Euro-American Congress on Construction Pathology, Rehabilitation Technology and Heritage Management, REHABEND 2022

ISBN

978-84-09-42253-1

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

1321-1326

Název nakladatele

UNIVERSITY OF CANTABRIA

Místo vydání

SANTANDER (SPAIN)

Místo konání akce

Granada

Datum konání akce

13. 9. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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