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Mechanical properties of cement foams in shear
The cell geometry of alumina cement foams is axisymmetric due to the loading of gravitational force of solid cement paste; the cell length along the gravitational direction is shorter than the cell lengths normal to the gravitational direction. Also, no large coalesced voids have been observed within alumina cement foams. Experimental results suggest that the existing models for closed-cell foams are applicable to describe the shear modulus, shear strength and fracture toughness of alumina cement foams. Mode II fracture toughness is consistently smaller than mode I fracture toughness for alumina cement foams. Meanwhile, the microstructure coefficients included in the theoretical expressions for the shear modulus, shear strength, fracture toughness of alumina cement foams have been determined. Existing models indicate that the mechanical properties of brittle foams in shear depend on relative density, cell size, cell geometry and the modulus of rupture of solid cell walls. A series of mechanical testing on alumina cement foams with various relative densities were conducted to measure their shear modulus, shear strength and fracture toughness. Experimental data are compared to the existing theoretical models. Results suggest that the existing models for closed-cell foams are applicable to describe the mechanical properties of alumina cement foams in shear. Also, the microstructure coefficients included in the theoretical expressions for mechanical properties of alumina cement foams have been determined.
Mechanical properties of cement foams in shear
The cell geometry of alumina cement foams is axisymmetric due to the loading of gravitational force of solid cement paste; the cell length along the gravitational direction is shorter than the cell lengths normal to the gravitational direction. Also, no large coalesced voids have been observed within alumina cement foams. Experimental results suggest that the existing models for closed-cell foams are applicable to describe the shear modulus, shear strength and fracture toughness of alumina cement foams. Mode II fracture toughness is consistently smaller than mode I fracture toughness for alumina cement foams. Meanwhile, the microstructure coefficients included in the theoretical expressions for the shear modulus, shear strength, fracture toughness of alumina cement foams have been determined. Existing models indicate that the mechanical properties of brittle foams in shear depend on relative density, cell size, cell geometry and the modulus of rupture of solid cell walls. A series of mechanical testing on alumina cement foams with various relative densities were conducted to measure their shear modulus, shear strength and fracture toughness. Experimental data are compared to the existing theoretical models. Results suggest that the existing models for closed-cell foams are applicable to describe the mechanical properties of alumina cement foams in shear. Also, the microstructure coefficients included in the theoretical expressions for mechanical properties of alumina cement foams have been determined.
Mechanical properties of cement foams in shear
Mechanische Eigenschaften von Porenzement unter Zug
Huang, J.S. (author) / Liu, K.D. (author)
Journal of Materials Science ; 36 ; 771-777
2001
7 Seiten, 9 Bilder, 2 Tabellen, 12 Quellen
Article (Journal)
English
Mechanical properties of cement foams in shear
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