Heat-Resistant Cement Composites Using Volcanic Pumps and Vermiculite

Khezhev, T. A.; Zhurtov, Artur; Hadzhishalapov, Gadzhimagomed H.

doi:10.4028/www.scientific.net/msf.931.489

Cited by 11 publications

(11 citation statements)

References 1 publication

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“…After carrying out the thermal engineering part of the calculation, made by the method of thermal balances, we proceed to the static part of the calculation. This part of the calculation is carried out according to the method proposed in [4], but the difference is that the characteristics of the materials will depend not only on the level of their loading, but also on the temperature at a given time.…”

Section: Resultsmentioning

confidence: 99%

“…The influence of the fireproof vermiculite-concrete layer on the bearing capacity of the reinforced cement layer was investigated by testing single-layer and two-layer reinforced cement elements measuring 35 × 100 × 400 mm in pure bending [4]. The thickness of the structural layer in single-and double-layer structures was 20 mm, and fireproof -15 mm.…”

Section: Methodsmentioning

confidence: 99%

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An Investigation of the Stress-Strain State of Two-Layer Armocement Structures on the Power and Temperature Effects during a Fire

Zhurtov

Khezhev

Кокоев

2018

MSF

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The effect of a fireproof vermiculite-concrete layer on the bearing capacity of the reinforced cement layer was tested by testing single-layer and two-layer armocement elements under pure bending under the conditions of a "standard fire". Temperature fields were obtained for single-layer and double-layer structures with one-sided heating by the Vanichev's method of thermal balances. It has been revealed that a fireproof layer made of vermiculite concrete with a thickness of 15 mm makes it possible to increase the load-bearing capacity of a thin-walled reinforcement cement structure in comparison with a single layer of the same thickness by 25% under the conditions of the "standard fire" temperature for one hour.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

An Investigation of the Stress-Strain State of Two-Layer Armocement Structures on the Power and Temperature Effects during a Fire

Zhurtov

Khezhev

Кокоев

2018

MSF

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“…RESULTS Table 1 shows sample diagrams of dependence of concrete compression strength in a heated state on deformation at various heating temperatures of a basic composition of concrete. Figures 3 and 4 show the calculation of the optimum composition of concrete before and after preheating according to the technique given in work [11]. The samples were tested for monoaxial compression in a heated state after isothermal endurance at temperatures from 20°C to 1000°C.…”

Section: Methodsmentioning

confidence: 99%

Influence of Preheating on Thermomechanical Properties of Heat-Resistant Ceramsite Concrete Based on Composite Binding Agent

Hadzhishalapov¹,

Gadzhiev²,

Hezhev³

et al. 2019

Proceedings of the International Symposium "Engineering and Earth Sciences: Applied and Fundamental Research" Dedicated to the

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The paper studies the influence of preheating on thermomechanical properties of heat-resistant ceramsite concrete based on activated composite binding agent. The basic composition of heat-resistant ceramsite concrete was used in the study. This composition included a ceramsite gravel of the Kizilyurt Ceramsite Plant as a large and small filler, as well as the composite binding composition of portland cement + impalpable ceramsite sand with the activation on a planetary mill Activator-4M. The use of light heat-resistant concrete instead of single-piece refractory materials in kilns of various thermal units will allow decreasing the material consumption by 30-40% and reducing heat losses by 25-35%. [8]. The use of local construction materials allows increasing the efficiency of concrete in comparison with imported refractory materials. The composition of light heatresistant concrete with large and small fillers from ceramsite gravel of the Kizilyurt Ceramsite Plant and the activated composite binding agent based on the portland cement of the Buynaksk Cement Plant with impalpable ceramsite sand is developed for the study. The activation of a composite binding agent effectively increases the reaction capacity of a binding agent and reduces the water cement ratio, which improves the performance of concrete [1, 2, 10] due to the reduction of chemically unbound water in concrete. We believe that the preheating of a mixture prior to drying at a temperature of 105°C effectively affects the performance of concrete and reduces its destruction due to the presence of chemically unbound water. This reduces the number of microcracks in the structure of a concrete due to intensified hydration of the activated composite binding agent. The optimum mode of preheating and its influence on thermomechanical characteristics of concrete is defined. The influence of a concrete mixture preheating on its thermomechanical properties and efficiency of the accepted method is analyzed.

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“…(Ibragimov et al 2019;Smirnov et al 2017). The protection of structures against high temperatures and fire has been investigated by Khezhev et al (2018), Khoury (2002), Kodur and Sultan (2003) and Donatello et al (2014).…”

Section: Introductionmentioning

confidence: 99%

Link of Self-Compacting Fiber Concrete Behaviors to Composite Binders and Superplasticizer

Федюк

Mosaberpanah

Lesovik

et al. 2020

ACT

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Composite binders were prepared as novel compositions, on the basis of which fiber reinforced self-compacting concretes (FRSCC) with high rheological, mechanical, dynamical, and impermeability behaviors are created. Rice husk ash, quartz sand, and limestone crushing waste within CEM I and different ratio of superplasticizer were investigated as components of composite binders. Central Composite Face Centered method was used to design the number of experiments and randomizations and then screened by Response Surface Methodology. The validity of models was projected by ANOVA. Replacement of cement by waste composite binders as a supplementary cementitious material has a positive effect on mechanical properties of FRSCC from 30% to around 35% of cement replacement. Adding the superplasticizer improved the performance of FRSCC in all aspects in the given range. Increasing the waste composite binders decreased the vapor permeability and effective diffusion coefficient of FRSCC by improving the hydration rate and decreasing the pores of the concrete matrix. Designed FRSCC has the potential to be used as a material for protective structures, because it is able to provide comprehensive protection against the dynamic effects and penetration of gases.

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Heat-Resistant Cement Composites Using Volcanic Pumps and Vermiculite

Cited by 11 publications

References 1 publication

An Investigation of the Stress-Strain State of Two-Layer Armocement Structures on the Power and Temperature Effects during a Fire

An Investigation of the Stress-Strain State of Two-Layer Armocement Structures on the Power and Temperature Effects during a Fire

Influence of Preheating on Thermomechanical Properties of Heat-Resistant Ceramsite Concrete Based on Composite Binding Agent

Link of Self-Compacting Fiber Concrete Behaviors to Composite Binders and Superplasticizer

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