The Experts below are selected from a list of 46362 Experts worldwide ranked by ideXlab platform

Maria Kaszyńska - One of the best experts on this subject based on the ideXlab platform.

  • Early age properties of High-strength/High-Performance Concrete
    Cement and Concrete Composites, 2002
    Co-Authors: Maria Kaszyńska
    Abstract:

    Abstract Analyses and results of tests on heat of hydration and compressive strength of High-Performance Concrete cured in variable thermal conditions are presented in this paper. Investigations of hydration heat of cement were carried out in calorimeter, in adiabatic conditions. Test samples for strength tests were stored in isothermal conditions at temperature of T=8°C, 20°C, 35°C, and in adiabatic conditions at the temperature controlled by the temperature of the sample used in the hydration heat test. The purpose of the research was to determine a relation between the amount and kinetics of heat generation and the early age compressive strength of High-Performance Concrete cured in the massive structure, where the temperature in Concrete changes continuously. The results for High-Performance Concrete are compared with respective values obtained for normal Concrete.

Bertil Persson - One of the best experts on this subject based on the ideXlab platform.

  • Poisson's ratio of High-Performance Concrete
    Cement and Concrete Research, 1999
    Co-Authors: Bertil Persson
    Abstract:

    This article outlines an experimental and numerical study on Poisson's ratio of High-Performance Concrete subjected to air or sealed curing. Eight qualities of Concrete (about 100 cylinders and 900 cubes) were studied, both young and in the mature state. The Concretes contained between 5 and 10% silica fume, and two Concretes in addition contained air-entrainment. Parallel studies of strength and internal relative humidity were carried out. The results indicate that Poisson's ratio of High-Performance Concrete is slightly smaller than that of normal-strength Concrete. Analyses of the influence of maturity, type of aggregate, and moisture on Poisson's ratio are also presented. The project was carried out from 1991 to 1998.

Neal S. Berke - One of the best experts on this subject based on the ideXlab platform.

  • Properties of High-Performance Concrete containing shrinkage-reducing admixture
    Cement and Concrete Research, 1997
    Co-Authors: Kevin J. Folliard, Neal S. Berke
    Abstract:

    The effects of a recently developed shrinkage-reducing admixture on High-Performance Concrete properties are described. High-Performance Concrete mixtures containing silica fume were cast with and without shrinkage-reducing admixture. The mechanical properties, drying shrinkage, and resistance to restrained shrinkage cracking were investigated. The results show that the shrinkage-reducing admixture effectively reduced the shrinkage of High-Performance Concrete, and resulted in a significant decrease in restrained shrinkage cracking.

G Debicki - One of the best experts on this subject based on the ideXlab platform.

  • permeability of High Performance Concrete subjected to elevated temperature 600 c
    Construction and Building Materials, 2009
    Co-Authors: Albert Noumowe, Rafat Siddique, G Debicki
    Abstract:

    Abstract Permeability is one of the most important parameters to quantify the durability of High-Performance Concrete. Permeability is closely related with the spalling phenomenon in Concrete at elevated temperature. This parameter is commonly measured on non-thermally damaged specimens. This paper presents the results of an experimental investigation carried out to study the effect of elevated temperature on the permeability of High-Performance Concrete. For this purpose, three types of Concrete mixtures were prepared: (i) control High-Performance Concrete; (ii) High-Performance Concrete incorporating polypropylene fibres; and (iii) High-Performance Concrete made with lightweight aggregates. A heating–cooling cycle was applied on 160 × 320 mm, 110 × 220 mm, and 150 × 300 mm cylindrical specimens. The maximum test temperature was kept as either 200 or 600 °C. After the thermal treatment, 65 mm thick slices were cut from each cylinder and dried prior to being subjected to permeability test. Results of thermal gradients in the Concrete specimens during the heating–cooling cycles, compressive strength, and splitting tensile strength of Concrete mixtures are also presented here. A relationship between the thermal damage indicators and permeability is presented.

Nivin Philip - One of the best experts on this subject based on the ideXlab platform.

  • Strength and Permeability of High Performance Concrete Containing Metakaolin
    SSRN Electronic Journal, 2015
    Co-Authors: Hema Ann Mathew, Nivin Philip
    Abstract:

    High Performance Concrete is a Concrete mixture, which possess High durability and High strength when compared to conventional Concrete. Use of pozzolanic materials is necessary for producing High Performance Concrete. These materials when used as mineral admixtures in High Performance Concrete can improve both strength and durability properties of Concrete. This paper focus on the comparison of metakaolin and palm oil fuel ash for selecting a suitable admixture for developing High Performance Concrete (M60 grade). Two types of Concrete mixes were prepared and compared to obtain the optimum design mix. The mechanical and permeability properties of the optimum mix were also studied.