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Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars
Two different anionic surfactants, sodium oleate and calcium stearate, commercialized as water repellents for cement-based mortars, were added to lime-based mortars in order to check whether they were improved by these admixtures. Different properties of lime-based mortars were evaluated: fresh state behaviour through water retention, air content and setting time, hardened state properties such as density, water absorption through capillarity, water vapour permeability, long-term compressive strengths, pore structure through mercury intrusion porosimetry, and durability assessed by means of freezing-thawing cycles. A clear improvement in lime-based mortars was achieved when sodium oleate was added: strong capillarity reduction and excellent durability in the face of freezing-thawing processes, without any compressive strength drop. The mechanism for this improvement was related to air void formation due to the air-entraining ability of these surfactants. Insolubility of calcium stearate turned out to be responsible for fewer air bubbles - as SEM examination revealed - and showed lower effectiveness.
Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars
Two different anionic surfactants, sodium oleate and calcium stearate, commercialized as water repellents for cement-based mortars, were added to lime-based mortars in order to check whether they were improved by these admixtures. Different properties of lime-based mortars were evaluated: fresh state behaviour through water retention, air content and setting time, hardened state properties such as density, water absorption through capillarity, water vapour permeability, long-term compressive strengths, pore structure through mercury intrusion porosimetry, and durability assessed by means of freezing-thawing cycles. A clear improvement in lime-based mortars was achieved when sodium oleate was added: strong capillarity reduction and excellent durability in the face of freezing-thawing processes, without any compressive strength drop. The mechanism for this improvement was related to air void formation due to the air-entraining ability of these surfactants. Insolubility of calcium stearate turned out to be responsible for fewer air bubbles - as SEM examination revealed - and showed lower effectiveness.
Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars
Izaguirre, A. (author) / Lanas, J. (author) / Alvarez, J.I. (author)
Cement and Concrete Research ; 39 ; 1095-1104
2009
10 Seiten, 49 Quellen
Article (Journal)
English
Additiv , anionaktives Tensid , Dauerhaftigkeit , Druckfestigkeit , flüssiger Mörtel , Frost-Tauwechsel-Prüfung , Hohlraumbildung , Kalkmilch , Kapillarität , mechanische Festigkeit , Mörtel , Natriumoleat , Porenbildung , Porengrößenverteilung , Quecksilberporosimeter , Rasterelektronenmikroskopie , Wasseraufnahme , Wasserdampfdurchlässigkeit , Wasserrückhaltung
Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars
| Online Contents | 2009
Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars
| Online Contents | 2009
Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars
| British Library Online Contents | 2009
Admixtures effect on fresh state properties of aerial lime based mortars
| Online Contents | 2009
Admixtures effect on fresh state properties of aerial lime based mortars
| Online Contents | 2009