Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars
AbstractTwo 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
AbstractTwo 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. (Autor:in) / Lanas, J. (Autor:in) / Álvarez, J.I. (Autor:in)
Cement and Concrete Research ; 39 ; 1095-1104
21.07.2009
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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
| Tema Archiv | 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
| Elsevier | 2008