Thermal insulation of concrete and the repair material CFRP exposed to high temperature and different time intervals

Guruprasad, Y. K.; Ramaswamy, Ananth

doi:10.1016/j.conbuildmat.2019.01.236

Cited by 11 publications

(3 citation statements)

References 9 publications

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“…Because concrete is the most commonly used building material, researchers have explored methods for enhancing the properties of concrete materials [11][12][13]. Thermal conductivity, which is the ability of a material to transmit heat, is the property of main concern when evaluating concrete thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Properties and Microstructure Distribution of High-Performance Thermal Insulation Concrete

et al. 2020

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The aim of this experimental study is to develop high strength and lightweight concrete mixture suitable for structural applications. This work investigates the effect of replacing normal aggregate either partially or totally with expanded perlite aggregate. This material allows for better thermal insulation properties, thus decreasing the energy usage within the life cycle of the concrete structure. Expanded perlite aggregate was used in concrete by 20%, 40%, 60%, 80%, and 100% in replacement of the natural aggregate. Material characterization tests of compressive strength, flexural strength, and thermal conductivity were carried out for six concrete mixtures. In addition, microstructure analysis was performed with the aid of a micro-computed tomography system to investigate the effects and relation of microstructure quantities on material properties. The proposed concrete mixture, which has 100% of expanded perlite aggregate, has a unit weight of 1703 kg/m3 and achieved reduction percentage of thermal conductivity around 62% (1.81 to 0.69 W·m−1·K−1) and a compressive strength of 42 MPa at 28 days; and thus is ideal for structural applications with enhanced properties.

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Section: Introductionmentioning

confidence: 99%

Properties and Microstructure Distribution of High-Performance Thermal Insulation Concrete

et al. 2020

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“…The effect of insulating FRP laminate from elevated temperatures on the mechanical performance was confirmed when Y. K. Guruprasad and A. Ramaswamy wrapped samples of concrete cylinders with CFRP and geopolymer mortar and other samples with CFRP and ceramic fiber blanket and exposed them to high temperatures (400-715 • C) [18]. Regarding the glass transition temperature improvement, M. A. Sawpan et al obtained the glass transition temperature of an accelerated hygrothermal-aged sample of pultruded GFRP rebars for different aging intervals.…”

Section: Introductionmentioning

confidence: 87%

The Dynamic and Flexural Behavior of Coated GFRP Rebars after Exposure to Elevated Temperatures

2022

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The dynamic and flexural behavior of pultruded glass fiber reinforced polymer GFRP rebars were investigated after exposure to elevated temperatures ranging from room temperature to 290 °C. The rebars were cut and grouped into two sets. The first set contained the uncoated specimens, and the second set enclosed the specimens that had been coated with a gun-sprayed thin layer of silicon matrix mixed with ceramic nanoparticles as an insulation medium. All specimens’ dynamic and flexural performances were experimentally performed after heating them inside the oven for 6 h and later cooled down outside the oven at room temperature for 24 h. The dynamic results of the coated specimens showed slight changes in the damping ratio due to the effectiveness of the coating layer. In contrast, the uncoated specimens showed a gradual increase in the damping ratio ranging from 12.5% to 43.1%. Similarly, the tested flexural strength of the coated specimens provided slight changes within the elevated temperatures, while the uncoated specimens showed a gradual decrease ranging from 3.9% to 6.4%.

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“…From the performed experiments, they observed that the developed insulation could improve the fire performance of strengthened beams and significantly increase their postfire residual strength. Guruprasad & Ramaswamy, (2019) experimentally evaluated the fire performance of two different insulation materials to protect CFRP-wrapped concrete specimens and used finite element methods to assess the participation of insulation with four different thicknesses. From the experimental tests, they observed that both insulation materials could effectively protect the specimens from high temperatures up to 715 °C.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Effect of Different Insulation Schemes on Fire Performance of FRP Strengthened Concrete: FIRECOAT and REALROCK

Altunişik,

Akbulut,

Adanur

et al. 2023

Int J Concr Struct Mater

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The past two decades have witnessed rapid advances in the use of fiber-reinforced polymer (FRP) composites in different engineering fields. Advantages such as high strength-to-weight ratio, corrosion resistance, and tailority have led to immense interest in the use of FRPs in wide spectrum repair and strengthening of structures. Despite their many advantages, FRPs are highly sensitive to high temperatures, which pose a major concern for fire potential structures such as buildings. Applying proper thermal insulation can enhance the fire performance of FRP and reduce the possible fire damage to the FRP strengthened element. This study set out to experimentally investigate the effectiveness of two insulation systems, “FIRECOAT” and “REALROCK” on fire performance of CFRP and GFRP strengthened concrete specimens. Various configurations and exposure durations were considered to evaluate the effectiveness of insulating materials. To perform the experiments, cylindrical concrete specimens were fabricated and strengthened using CFRP or GFRP. After insulating the specimens, they were exposed to a standard fire curve for two different durations of 30 and 60 min. The results indicate that less than 30 min of fire, both insulation systems can provide the required protection. During long exposure duration of 60 min, only REALROCK can provide the required thermal resistance for FRP-strengthened concrete. Within the tested materials, Fire Set 60 outperformed other insulating materials. It was observed that implementing Fire Set 60 in the innermost layer of thermal insulations has crucial importance in preventing the fire induced reductions in strength of FRP-strengthened concrete elements.

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Thermal insulation of concrete and the repair material CFRP exposed to high temperature and different time intervals

Cited by 11 publications

References 9 publications

Properties and Microstructure Distribution of High-Performance Thermal Insulation Concrete

Properties and Microstructure Distribution of High-Performance Thermal Insulation Concrete

The Dynamic and Flexural Behavior of Coated GFRP Rebars after Exposure to Elevated Temperatures

Experimental Study of the Effect of Different Insulation Schemes on Fire Performance of FRP Strengthened Concrete: FIRECOAT and REALROCK

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