Analytical Model to Establish the Thermal Conductivity of Porous Structure

Mao, Chongchong; Mydin, Azree Othuman; Que, Xiufu

doi:10.11113/jt.v69.2508

Cited by 3 publications

(3 citation statements)

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“…Different ways to calculate the thermal conductivity of intumescent coating have been developed. Equivalent thermal conductivities have been studied in [2][3][4][5][6][7], where the foaming of the coating is modelled excplicitly. Effective thermal conductivity, where the expansion of the coating is calculated into the conductivity, has been modelled by [8], [9] and [3].…”

Section: Introductionmentioning

confidence: 99%

Resistance of partially protected steel beams in fire

Hautala¹,

Kangashaka²,

Malaska³

et al. 2021

ce papers

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Intumescent coating is often used as a fire protection on steel members due to its attractive appearance and ease of use. In the case when the member is fully covered by the coating, the response during the fire can be predicted rather accurately. However, if the member is covered only partially, the member's temperature profile and the structural response during the fire are not trivial to define. Partially covered members appear e.g. in cases in which the member is coated on the building site, but some previously installed adjacent structures disturb the coating process. Such partially covered members have been studied in the literature mainly from the temperature point of view, but in the present paper, also the structural behavior during the fire is considered. The paper presents a general procedure how to define the resistance of a partially protected steel member during the fire. As a result, time‐resistance curves are defined for bending, shear and torsion and standard IPE and HEA profiles are used in the example simulations and the results are compared to fully protected and unprotected cases. The finite element method is adopted both for the thermal and structural analyses. The expansion of the intumescent coating is taken into account using the so called effective thermal conductivity, hence the same model can be used for both analyses. The simulated temperature results are validated against experimental and simulation results from previous researches. The results for bending, shear and torsion resistance show, that when compared to the unprotected case, the partial protection increases the resistances and the improvement is at its height during 15‐30 minutes from the beginning of the standard fire.

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Section: Introductionmentioning

confidence: 99%

Resistance of partially protected steel beams in fire

Hautala¹,

Kangashaka²,

Malaska³

et al. 2021

ce papers

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“…al. [5], chemical reactions and the behaviour of calcium hydroxide, calcium carbonate, calcium silicate hydrate, non-evaporable water and micropores under various temperatures was examined. They found that the major increase of concrete permeability and porosity at high temperature was primarily produced by arising microcracks and by changes of material inner structure, as well as by crack opening due to high gas pressure values [6].…”

Section: Introductionmentioning

confidence: 99%

Residual Compressive Strength of Lightweight Foamed Concrete after Exposure to High Temperatures

Mydin

Yunos

Nawi

et al. 2015

AMM

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Even though lightweight foamed concrete has low mechanical properties compared to normal weight concrete, there is a potential of using this material as partition or load-bearing wall in low-rise residential construction. Before it can be considered for use as a load-bearing element in the building industry, it is necessary to acquire reliable information of its mechanical properties at ambient and high temperatures for quantification of its fire resistance performance. This paper will present the results of experiments that have been carried out to examine and characterize the residual compressive strength of foamed concrete after high temperatures. Foamed concrete with 700 kg/m3 and 1000 kg/m3 density were cast and tested. The compression tests were carried out at ambient temperature, 100, 200, 300, 400, 500 and 600°C.

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“…It has excellent resistance to water and frost, and provides a high level of both sound and thermal insulation [7]. The material is now being used in an ever increasing number of applications, ranging from one step house casting to low density void fills [8,9]. Figure 1 and Figure 2 show some examples of the application of foamed concrete in real projects.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation on Compressive Strength and Micro-structural Features of Foamed Concrete with Addition of Wood Ash and Silica Fume as a Cement Replacement

Mydin

Shajahan

Ganesan

et al. 2014

MATEC Web of Conferences

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Abstract. Wood Ash (WA) and Silica Fume (SF) exhibit good cementation properties and have great potential as supplementary binder materials for the concrete production industry. This study will focus on enhancing the micro-structural formation and compressive strength of foamed concrete with the addition of WA and SF. A total of 3 mixes were prepared with the addition of WA and SF at various cement replacement levels by total binder weight. For this particular study, the combination of WA (5%, 10%, and 15% by binder weight) and SF (5%, 10%, and 15% by binder weight) were utilized as supplementary binder materials to produce foamed concrete mixes. As was made evident from micrographs obtained in the study, the improvement observed in the compressive strength of the foamed concrete was due to a significant densification in the microstructure of the cement paste matrix in the presence of WA and SF hybrid supplementary binders. Experimental results indicated that the combination of 15% SF and 5% WA by binder weight had a more substantial influence on the compressive strength of foamed concrete compared to the control mix. Furthermore, the addition of WA and SF significantly prolonged the setting times of the blended cement paste of the foamed concrete.

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Analytical Model to Establish the Thermal Conductivity of Porous Structure

Cited by 3 publications

References 0 publications

Resistance of partially protected steel beams in fire

Resistance of partially protected steel beams in fire

Residual Compressive Strength of Lightweight Foamed Concrete after Exposure to High Temperatures

Laboratory Investigation on Compressive Strength and Micro-structural Features of Foamed Concrete with Addition of Wood Ash and Silica Fume as a Cement Replacement

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