Browsing by Author "Videla, C"

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    Effectiveness of shrinkage-reducing admixtures on Portland pozzolan cement concrete
    (CONSEJO SUPERIOR INVESTIGACIONES CIENTIFICAS-CSIC, 2005) Videla, C; Aguilar, C
    Drying shrinkage causes tensile stress in restrained concrete members. Since all structural elements are subject to some degree of restraint, (trying shrinkage is regarded to be one of the main causes of concrete cracking.
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    Modeling portland blast-furnace slag cement high-performance concrete
    (AMER CONCRETE INST, 2004) Videla, C; Gaedicke, C
    This research focused on portland blast-furnace slag cement high-performance concrete (HPC), with specified 28-day compressive strengths between 60 to 110 MPa. Compressive and flexural strength, elastic modulus, abrasion resistance, and shrinkage properties were studied. Laboratory test results showed that it is possible to develop a general compressive strength model combining a hyperbolic equation for strength evolution and an exponential equation for mixture design parameters. It was also concluded that the measured moduli of elasticity are lower than the ACI predicted values, and that the square root of the compressive strength was not a good predictor of the flexural strength for the materials used. Furthermore, in this paper it was concluded that the ASTM C 944-99 abrasion test is not a very effective way to measure abrasion resistance of HPC. Autogenous shrinkage showed to be a significant part of total shrinkage. An updated FIB 2000 model to local conditions was successfully developed to predict shrinkage of HPC.
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    Updating concrete drying-shrinkage prediction models for local materials
    (AMER CONCRETE INST, 2004) Videla, C; Covarrubias, JP; Masana, C
    This paper addresses the need to update existing concrete drying-shrinkage prediction models to reflect local materials. The experimental program was carried out using eight concrete mixtures of similar strength, manufactured with portland and portland pozzolan cements representing the most used concretes in Chile.