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  • 1985-1989  (11)
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    The microstructure of Portland cement—silica fume pastes (1986)
    Springer
    Journal of materials science 5 (1986), S. 101-102 
    Details
    ISSN: 1573-4811
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01671453
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  • 2
    Digitale Medien
    Digitale Medien
    The mechanism of the peak in strength and toughness at elevated temperatures in alumina containing a glass phase (1985)
    Springer
    Journal of materials science 20 (1985), S. 2614-2622 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The fracture of an alumina containing 5% by volume of glass phase has been studied over the temperature range 20 to 900° C. Peaks in fracture stress andK Ic at elevated temperatures have been confirmed to arise from softening of the glass phase by determining the temperature dependence of the viscosity of a glass of identical composition to that occurring in the ceramic. Observations of fracture surface show glass protrusions at temperatures of the peak in strength orK Ic indicating the viscous stretching of glass particles bridging the opposite crack surfaces and a simple model considering the energy dissipated in this process is presented. The peaks in strength andK Ic arise from this energy dissipation rather than from blunting of the crack.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00556093
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  • 3
    Digitale Medien
    Digitale Medien
    High strength cement pastes (1985)
    Springer
    Journal of materials science 20 (1985), S. 2846-2852 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The microstructures of high strength cements containing polymer (sometimes known as MDF cements) has been examined. They are basically composed of either clinker or clinker plus hydration products embedded in an amorphous polymeric matrix. Cement pastes based on ordinary Portland cement (OPC) contain the usual hydrates but lack the pronounced fibrillar morphology of hydrate gel often observed in conventional pastes. In contrast, pastes based on the high alumina cement Secar 71 did not contain the normal cyrstalline hydrate phases. Energy dispersive microanalysis of the polymeric phase in Secar 71 material revealed the presence of calcium and aluminium while calciumrich interstitial material was found in OPC pastes. These results indicate that the organic component plays a more active role than that of an inert rheological aid. The effect of prolonged reaction with hot water is to cause the formation of crystalline hydrate products in Secar 71 paste with a permanent loss in strength of the order of 50%. OPC based pastes appear to be less affected by a similar treatment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00553047
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  • 4
    Digitale Medien
    Digitale Medien
    Time-dependent mechanical properties of high-strength cements (1986)
    Springer
    Journal of materials science 21 (1986), S. 4009-4014 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A high-strength cement paste based on aluminous cement with the addition of water-soluble polymer was found to have a flexural strength which increased at about 12 MPa per decade increase in strain rate over the range 10−6 to 10−2 sec−1. The effect of soaking in water was to markedly reduce the strength. Swelling occurred on soaking in water for both Portland and aluminous cement-based pastes but was more gradual for the latter. Wetting swelling and drying shrinkage increased with polymer content for Portland-based pastes. Creep and stress relaxation in one type of Portland cement-based paste and in aluminous cement-based paste were markedly increased by soaking, but in a second type of Portland-based paste there was little effect. These effects are attributed to the polymer content of the pastes and its distribution in the pastes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02431643
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  • 5
    Digitale Medien
    Digitale Medien
    Discussion (1985)
    Springer
    Journal of materials science 20 (1985), S. 3418-3420 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00545211
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  • 6
    Digitale Medien
    Digitale Medien
    The effect of latex on macrodefect-free cement (1987)
    Springer
    Journal of materials science 22 (1987), S. 2148-2152 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The effect of adding latex to macrodefect-free cement was studied. The porosity of the modified pastes was smaller than the normal macrodefect system but the pore size was not significantly changed. The traditional relationship between strength and flaw size in the cement system was found to be inadequate to explain the observed mechanical behaviour of the latex-modified systems. Scanning electron microscopy of the fracture surfaces of the normal and latex-modified pastes revealed that the use of different polymers resulted in different fracture paths through the cement composite. This was due to the difference in chemical nature of the polymer. The results demonstrated that the modulus (E) and fracture energy (R) terms in the traditional Griffith equation become limiting factors for strength determination in low-porosity cement systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01132951
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  • 7
    Digitale Medien
    Digitale Medien
    High strength cement pastes (1985)
    Springer
    Journal of materials science 20 (1985), S. 2853-2860 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A study of the chemical reactions occurring in high strength cements is presented with particular reference to the cement-polymer interaction. The addition of small amounts (1.6%) of polyvinyl (alcohol/acetate) to the high alumina cement Secar 71 significantly retards the normal hydration reactions. At much larger doses (10% PVA) the crystalline hydrates are completely suppressed and the polymer reacts with the cement solution to form calcium acetate and a crosslinked polymeric product. In the case of high strength OPC/polyacrylamide pastes, the high pH of the cement solution converts the polymer to polyacrylic acid which reacts with the cations from the hydrated cement to form a crosslinked metal-polyacrylate. This latter system is analogous to reactions which occur in certain polyacrylic acid-based dental cements.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00553048
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  • 8
    Digitale Medien
    Digitale Medien
    Time-dependent mechanical properties of high-strength cements (1986)
    Springer
    Journal of materials science 21 (1986), S. 4009-4014 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A high-strength cement paste based on aluminous cement with the addition of water-soluble polymer was found to have a flexural strength which increased at about 12 MPa per decade increase in strain rate over the range 10−6 to 10−2 sec−1. The effect of soaking in water was to markedly reduce the strength. Swelling occurred on soaking in water for both Portland and aluminous cement-based pastes but was more gradual for the latter. Wetting swelling and drying shrinkage increased with polymer content for Portland-based pastes. Creep and stress relaxation in one type of Portland cement-based paste and in aluminous cement-based paste were markedly increased by soaking, but in a second type of Portland-based paste there was little effect. These effects are attributed to the polymer content of the pastes and its distribution in the pastes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00553460
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  • 9
    Digitale Medien
    Digitale Medien
    The microstructure of macrodefect-free cement with different polymer contents and the effect on water stability (1988)
    Springer
    Journal of materials science 23 (1988), S. 657-660 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The effect of different polymer contents on the microstructure of ordinary Portland cementbased macrodefect-free cement was studied by high voltage transmission electron microscopy. The microstructure, especially the morphology and composition of the gel matrix, of material with a low polymer content was significantly different from that of material with a high polymer content. The former consisted mainly of gelatinous material with some microcrystallites and with some porosity. The latter consisted of mainly pure non-porous polymer gel with little metallic content. Although the dry strength of the material with high polymer content was higher than that of the lower polymer content material, the former was extremely unstable after immersing in water. This was attributed to the difference in microstructure of the polymer gel as revealed by electron microscopy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01174701
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  • 10
    Digitale Medien
    Digitale Medien
    Hydration of Portland cement followed by29Si solid-state NMR spectroscopy (1985)
    Springer
    Journal of materials science 4 (1985), S. 1293-1295 
    Details
    ISSN: 1573-4811
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00723485
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