The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform

Minoru Harada - One of the best experts on this subject based on the ideXlab platform.

  • Fire Resistance Test for Fire protection materials with high water content
    International Journal of Heat and Mass Transfer, 2000
    Co-Authors: Yutaka Asako, Yoshiyuki Yamaguchi, Minoru Harada
    Abstract:

    It is known that moist Fire protection materials show good Fire Resistance characteristics. For this reason, these materials are usually made of mixtures of cement mortar and high water content materials such as silica gels or moist perlites. The latent heat of water plays an important role in the Resistance of heat propagation in these materials. In this study, a Fire Resistance Test of a material with high water content is conducted and the temperature response of the Test is obtained. Also, the water content of the Test materials is measured. The Test material consists of a mixture of perlite mortar and gel. The gel absorbs the aqueous solution of calcium chloride, which serves as a water storage mechanism. The numerical predictions to simulate the Fire Resistance Test were conducted and the results were compared with the experimentally obtained temperature responses.

  • numerical modeling of Fire walls to simulate Fire Resistance Test
    Journal of Heat Transfer-transactions of The Asme, 1998
    Co-Authors: Yutaka Asako, Yoshiyuki Yamaguchi, Minoru Harada
    Abstract:

    A Fire wall is made of a mortar wall in which water storage materials are mixed. However, the mortar Fire wall is relatively heavy. A nonorganic insulator for middle and high-temperature ranges such as a calcium silicate board is expected as a good material for the Fire wall because of a light weight. Usually, a nonorganic insulator such as the calcium silicate board consists of a hydrate which contains free water, physically adsorbed water, and crystalline water. Behavior of such waters should be considered for a numerical model which is used to predict thermal responses of a Fire wall. A simple one-dimensional numerical model to predict thermal response of a Fire wall which is made of a nonorganic hydrate insulator, is developed. The numerical computations to simulate the thermal responses for a standard Fire Resistance Test were performed for a sand wall of five percent volume of moisture and two calcium silicate boards which contains free water, adsorbed water, and crystalline water. The experiments for the sand wall and the calcium silicate boards were also performed. The numerical results were compared with experiments. The proposed model well predicts the thermal responses of the walls.

Yutaka Asako - One of the best experts on this subject based on the ideXlab platform.

  • Fire Resistance Test for Fire protection materials with high water content
    International Journal of Heat and Mass Transfer, 2000
    Co-Authors: Yutaka Asako, Yoshiyuki Yamaguchi, Minoru Harada
    Abstract:

    It is known that moist Fire protection materials show good Fire Resistance characteristics. For this reason, these materials are usually made of mixtures of cement mortar and high water content materials such as silica gels or moist perlites. The latent heat of water plays an important role in the Resistance of heat propagation in these materials. In this study, a Fire Resistance Test of a material with high water content is conducted and the temperature response of the Test is obtained. Also, the water content of the Test materials is measured. The Test material consists of a mixture of perlite mortar and gel. The gel absorbs the aqueous solution of calcium chloride, which serves as a water storage mechanism. The numerical predictions to simulate the Fire Resistance Test were conducted and the results were compared with the experimentally obtained temperature responses.

  • numerical modeling of Fire walls to simulate Fire Resistance Test
    Journal of Heat Transfer-transactions of The Asme, 1998
    Co-Authors: Yutaka Asako, Yoshiyuki Yamaguchi, Minoru Harada
    Abstract:

    A Fire wall is made of a mortar wall in which water storage materials are mixed. However, the mortar Fire wall is relatively heavy. A nonorganic insulator for middle and high-temperature ranges such as a calcium silicate board is expected as a good material for the Fire wall because of a light weight. Usually, a nonorganic insulator such as the calcium silicate board consists of a hydrate which contains free water, physically adsorbed water, and crystalline water. Behavior of such waters should be considered for a numerical model which is used to predict thermal responses of a Fire wall. A simple one-dimensional numerical model to predict thermal response of a Fire wall which is made of a nonorganic hydrate insulator, is developed. The numerical computations to simulate the thermal responses for a standard Fire Resistance Test were performed for a sand wall of five percent volume of moisture and two calcium silicate boards which contains free water, adsorbed water, and crystalline water. The experiments for the sand wall and the calcium silicate boards were also performed. The numerical results were compared with experiments. The proposed model well predicts the thermal responses of the walls.

  • Numerical modeling of Fire walls to simulate Fire Resistance Test
    American Society of Mechanical Engineers Heat Transfer Division (Publication) HTD, 1997
    Co-Authors: Z. F. Jin, Yutaka Asako, Y Yamaguchi, M. Harada
    Abstract:

    A Fire wall is made of a mortar wall in which aqua-reservoirs are mixed. However, the mortar Fire wall is relatively heavy. A non-organic insulator for middle and high temperature ranges such as a calcium silicate board is expected as a good material for the Fire wall because of a light weight. Usually, a non-organic insulator such as the calcium silicate board usually contains free water, physically absorbed water and crystalline water. Behavior of such waters should be considered for a numerical model which is used to predict thermal responses of a Fire wall. A Simple one-dimensional numerical model to predict thermal responses of a Fire wall which is made of a non-organic insulator such as a calcium silicate board, is developed. The numerical computations to simulate the thermal responses for a standard Fire Resistance Test were performed for a sand wall of 5 vol% of moisture and two calcium silicate boards which contains free water, physically absorbed water, and crystalline water. The experiments for the sand wall and the calcium silicate boards were also performed. The numerical results were compared with experiments. The proposed model well predicts the thermal responses of the walls.

Carlos A. Ferreira - One of the best experts on this subject based on the ideXlab platform.

  • Intumescent coatings using epoxy, alkyd, acrylic, silicone, and silicone–epoxy hybrid resins for steel Fire protection
    Journal of Coatings Technology and Research, 2020
    Co-Authors: Andreza P. Cardoso, Stéphanie C. Sá, Carlos H. M. Beraldo, Gelsa E. N. Hidalgo, Carlos A. Ferreira
    Abstract:

    Intumescent coatings are a great alternative for passive protection of metal substrates against Fire, with binder polymer being one of the main components of an intumescent system. The objective of this work was to compare five different resin types (epoxy, acrylic, alkyd, silicone, and silicone–epoxy hybrid) in an intumescent formulation and to study the influence of resin concentration on the Fire protection performance of the coating. Results from TGA and MCC analysis of resins and coatings indicated that coatings containing silicone are thermally stable and release smaller amounts of heat. In the Fire Resistance Test, samples containing epoxy and silicone resins had lower temperatures (130–160°C) compared to the other samples. It has also been found that it is possible to decrease resin concentration in formulations containing epoxy and silicone resins up to 25.6% and to maintain or even improve their Fire protection capability. Graphic abstract

  • intumescent coatings using epoxy alkyd acrylic silicone and silicone epoxy hybrid resins for steel Fire protection
    Journal of Coatings Technology and Research, 2020
    Co-Authors: Andreza P. Cardoso, Carlos H. M. Beraldo, Gelsa E. N. Hidalgo, Carlos A. Ferreira
    Abstract:

    Intumescent coatings are a great alternative for passive protection of metal substrates against Fire, with binder polymer being one of the main components of an intumescent system. The objective of this work was to compare five different resin types (epoxy, acrylic, alkyd, silicone, and silicone–epoxy hybrid) in an intumescent formulation and to study the influence of resin concentration on the Fire protection performance of the coating. Results from TGA and MCC analysis of resins and coatings indicated that coatings containing silicone are thermally stable and release smaller amounts of heat. In the Fire Resistance Test, samples containing epoxy and silicone resins had lower temperatures (130–160°C) compared to the other samples. It has also been found that it is possible to decrease resin concentration in formulations containing epoxy and silicone resins up to 25.6% and to maintain or even improve their Fire protection capability.

Ulf Wickström - One of the best experts on this subject based on the ideXlab platform.

  • adiabatic surface temperature and the plate thermometer for calculating heat transfer and controlling Fire Resistance furnaces
    Fire Safety Science, 2008
    Co-Authors: Ulf Wickström
    Abstract:

    The concept of adiabatic surface temperature AST can be used to express Fire exposure or insult on a structure. Thus it has been used to facilitate data transfer from the FDS computer Fire model to finite element models for calculating temperature in Fire exposed structures. It is also shown that the Plate Thermometer as specified in the international Fire Resistance Test standards ISO 834 and EN 1363-1 for harmonizing Fire Resistance Testing approximately measures adiabatic surface temperature. Therefore furnace temperature as measured with the PTs can be used directly to calculate the heat transfer to a specimen and thereby its temperature. The definition and applications of the concept of AST is described in this paper including an analogy with electric current and voltage to illustrate the concept in a graphical format. Finally it is recommended that PTs are introduced in all Fire Resistance standards as it harmonizes Fire Resistance Testing as well as it provides reliable data for numerical predictions of heat transfer to Fire exposed structures.

  • measuring incident radiant heat flux using the plate thermometer
    Fire Safety Journal, 2007
    Co-Authors: Haukur Ingason, Ulf Wickström
    Abstract:

    This paper shows that the plate thermometer as described in the Fire Resistance Test standards ISO 834-1 and EN 1363-1 can be used for measuring incident radiant flux under ambient conditions as an alternative to water cooled total flux heat metres (HFMs). Measurements with a plate thermometer mounted in the cone calorimeter and exposed to different heat flux levels were analysed as well as simultaneous measurements with total HFMs and plate thermometers in large scale Tests. It is shown how the incident radiant flux to a target can be derived from measurements with total HFMs and plate thermometers, respectively, and how well these two methods match. The plate thermometer is therefore deemed to be a practical alternative for measuring thermal conditions including incident radiant heat flux particularly under field conditions. It is, however, recommended that the plate thermometer should be modified when used under ambient conditions to reduce errors.

  • comments on paper by kay kirby and preston calculation of the heating rate of an unprotected steel member in a standard Fire Resistance Test
    Fire Safety Journal, 1997
    Co-Authors: Ulf Wickström, Thomas Hermodsson
    Abstract:

    Comments on paper by Kay, Kirby and Preston "Calculation of the heating rate of an unprotected steel member in a standard Fire Resistance Test"

Carlos H. M. Beraldo - One of the best experts on this subject based on the ideXlab platform.

  • Intumescent coatings using epoxy, alkyd, acrylic, silicone, and silicone–epoxy hybrid resins for steel Fire protection
    Journal of Coatings Technology and Research, 2020
    Co-Authors: Andreza P. Cardoso, Stéphanie C. Sá, Carlos H. M. Beraldo, Gelsa E. N. Hidalgo, Carlos A. Ferreira
    Abstract:

    Intumescent coatings are a great alternative for passive protection of metal substrates against Fire, with binder polymer being one of the main components of an intumescent system. The objective of this work was to compare five different resin types (epoxy, acrylic, alkyd, silicone, and silicone–epoxy hybrid) in an intumescent formulation and to study the influence of resin concentration on the Fire protection performance of the coating. Results from TGA and MCC analysis of resins and coatings indicated that coatings containing silicone are thermally stable and release smaller amounts of heat. In the Fire Resistance Test, samples containing epoxy and silicone resins had lower temperatures (130–160°C) compared to the other samples. It has also been found that it is possible to decrease resin concentration in formulations containing epoxy and silicone resins up to 25.6% and to maintain or even improve their Fire protection capability. Graphic abstract

  • intumescent coatings using epoxy alkyd acrylic silicone and silicone epoxy hybrid resins for steel Fire protection
    Journal of Coatings Technology and Research, 2020
    Co-Authors: Andreza P. Cardoso, Carlos H. M. Beraldo, Gelsa E. N. Hidalgo, Carlos A. Ferreira
    Abstract:

    Intumescent coatings are a great alternative for passive protection of metal substrates against Fire, with binder polymer being one of the main components of an intumescent system. The objective of this work was to compare five different resin types (epoxy, acrylic, alkyd, silicone, and silicone–epoxy hybrid) in an intumescent formulation and to study the influence of resin concentration on the Fire protection performance of the coating. Results from TGA and MCC analysis of resins and coatings indicated that coatings containing silicone are thermally stable and release smaller amounts of heat. In the Fire Resistance Test, samples containing epoxy and silicone resins had lower temperatures (130–160°C) compared to the other samples. It has also been found that it is possible to decrease resin concentration in formulations containing epoxy and silicone resins up to 25.6% and to maintain or even improve their Fire protection capability.