Lime-based plasters with combined expanded clay-silica aggregate: Microstructure, texture and engineering properties

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F17%3A00312723" target="_blank" >RIV/68407700:21110/17:00312723 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26110/17:PU124306

Výsledek na webu

<a href="http://www.sciencedirect.com/science/article/pii/S0958946516304462" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0958946516304462</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cemconcomp.2017.08.005" target="_blank" >10.1016/j.cemconcomp.2017.08.005</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Lime-based plasters with combined expanded clay-silica aggregate: Microstructure, texture and engineering properties

Popis výsledku v původním jazyce

Plasters containing lightweight aggregates are mostly characteristic by low bulk density and low thermal conductivity but these properties are often achieved at the expense of mechanical strength. In this paper, lightweight lime-based plasters which have both good thermal and mechanical properties are designed. As their supposed applications include the renovation of surface layers of historical buildings, burnt clay shale is used as pozzolanic admixture. The volumetric ratio of silica sand and expanded clay aggregate (ECA) is varied over a wide range to analyze the effect of ECA. The microstructural studies show a more compact ITZ between the matrix and ECA than of sand. Apparently, the surface roughness of ECA grains makes possible easier formation of hydration products and later it can support the growth of calcite and CSH amorphous phases. The textural analysis together with the basic physical properties reveals a substantial increase of open porosity with the increasing ECA dosage; the added pores are mostly within the range of 10 nm to 1 μm. The assessment of the wide range of engineering properties of the plasters leads to the identification of the lime-pozzolan plaster with the volumetric ratio of 1: 1 between sand and ECA as the most appropriate solution. The thermal conductivity of this plaster is two times lower than of the plaster with silica, while the changes in mechanical strengths are only marginal. The favorable hygric properties can be considered as another asset. Faster vapor transport, together with the higher water vapor adsorption capability, can decrease a risk of water condensation and moderate the effects of both exterior and interior climate, the relatively slow liquid water transport is a limiting factor for rainwater penetration. The economical parameters of the plaster with the best functional properties are also very good. According to the current situation on the Czech market, the price increase is only 3%.

Název v anglickém jazyce

Lime-based plasters with combined expanded clay-silica aggregate: Microstructure, texture and engineering properties

Popis výsledku anglicky

Plasters containing lightweight aggregates are mostly characteristic by low bulk density and low thermal conductivity but these properties are often achieved at the expense of mechanical strength. In this paper, lightweight lime-based plasters which have both good thermal and mechanical properties are designed. As their supposed applications include the renovation of surface layers of historical buildings, burnt clay shale is used as pozzolanic admixture. The volumetric ratio of silica sand and expanded clay aggregate (ECA) is varied over a wide range to analyze the effect of ECA. The microstructural studies show a more compact ITZ between the matrix and ECA than of sand. Apparently, the surface roughness of ECA grains makes possible easier formation of hydration products and later it can support the growth of calcite and CSH amorphous phases. The textural analysis together with the basic physical properties reveals a substantial increase of open porosity with the increasing ECA dosage; the added pores are mostly within the range of 10 nm to 1 μm. The assessment of the wide range of engineering properties of the plasters leads to the identification of the lime-pozzolan plaster with the volumetric ratio of 1: 1 between sand and ECA as the most appropriate solution. The thermal conductivity of this plaster is two times lower than of the plaster with silica, while the changes in mechanical strengths are only marginal. The favorable hygric properties can be considered as another asset. Faster vapor transport, together with the higher water vapor adsorption capability, can decrease a risk of water condensation and moderate the effects of both exterior and interior climate, the relatively slow liquid water transport is a limiting factor for rainwater penetration. The economical parameters of the plaster with the best functional properties are also very good. According to the current situation on the Czech market, the price increase is only 3%.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Cement and Concrete Composites

ISSN

0958-9465

e-ISSN

1873-393X

Svazek periodika

83

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

374-383

Kód UT WoS článku

000412251100031

EID výsledku v databázi Scopus

2-s2.0-85028311400