Fire Resistance Evaluation of Lightweight Geopolymer Concrete System Exposed to Elevated Temperatures of 100-800 °C

Abdulkareem, Omar A.; Bakri, A.M. Mustafa Al; Kamarudin, H.; Nizar, Ismail Khairul

doi:10.4028/www.scientific.net/kem.594-595.427

Cited by 6 publications

(4 citation statements)

References 11 publications

(16 reference statements)

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“…This thermal exposure induces the processes of dehydration and de-hydroxylation within the Geo-Polymer gel, resulting in a discernible loss of both mass and bulk density in the concrete. In their comprehensive study, Abdulkareem et al [109] meticulously examined the behavior of hardened Geo-Polymer materials under these conditions and identified three distinct forms of water trapped within the material that can escape during heating. Vapor pressure continues to rise above 100℃, resulting in mass loss when water adsorbed to the binder's surface is removed between room temperature and 100℃, and when pore water is eliminated between 100℃ and 1000℃.…”

Section: Volume Stability and Mass Lossmentioning

confidence: 99%

Elevated Temperature Effects on Geo-Polymer Concrete: An Experimental and Numerical-Review Study

Turkey,

Beddu,

Al-Hubboubi

et al. 2023

ACSM

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The manufacture of cement plays a substantial role in the emission of carbon dioxide (CO2) into the atmosphere, hence exacerbating the adverse impacts of global warming. Consequently, the emergence of Geo-Polymer concrete has presented itself as a potentially feasible substitute owing to its commendable environmental sustainability. This manuscript provides a comprehensive analysis of prominent studies investigating the effects of increased temperatures and fire exposure on concrete across its entire operating duration. This study examines the significant impacts on the fundamental physical and mechanical characteristics of concrete, as revealed by laboratory experiments. Furthermore, this review comprehensively examines previous research endeavors that have used machine learning methodologies to predict tangible actions, aiming to optimize resource allocation, time efficiency, and cost-effectiveness in laboratory inquiries. Geo-Polymer concretes have exhibited remarkable resistance to elevated temperatures and severe fires, as evidenced by laboratory and field assessments of cracking, spalling, and strength degradation. Prior studies have demonstrated that both the aggregate type and temperature have a substantial impact on the degradation of compressive strength. Moreover, previous research has indicated that Geo-Polymeric concrete, which is comprised of fly ash, exhibits superior heat resistance compared to conventional concrete using Portland cement, withstanding temperatures of up to 400 degrees Celsius. This research also highlights the widespread adoption of the Artificial Neural Network (ANN) technique in forecasting the compressive strength of conventional concrete. Conversely, alternative approaches such as the Genetic Weighted Pyramid Operation Tree (GWPOT) are preferred for high-performance concrete. The primary objective of this extensive investigation is to establish a fundamental basis for future studies on sustainable alternatives to concrete and approaches for predictive modeling.

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Section: Volume Stability and Mass Lossmentioning

confidence: 99%

Elevated Temperature Effects on Geo-Polymer Concrete: An Experimental and Numerical-Review Study

Turkey,

Beddu,

Al-Hubboubi

et al. 2023

ACSM

View full text Add to dashboard Cite

show abstract

“…Another important benefit of geopolymer cement is its resistance to acid and sulphate attack (Glasby et al, 2014), as well as freeze-thaw cycles (Abdulkareem et al, 2014). In terms of sulphate resistance, results from Douglas et al (1992) indicate that changes in the mechanical properties of geopolymer cement concrete specimens were minimal, after 120 days immersion in a 5% sodium sulphate solution.…”

Section: Other Propertiesmentioning

confidence: 99%

“…Further research has also indicated good resistance to acids, such as sulphuric acid and hydrogen chloride (Ariffin et al, 2013;Shi, 2003;Banah UK, 2014). In addition, Provis & van Deventer (2009), Davidovits (2013) and Abdulkareem et al (2014) discussed freeze-thaw properties. Mass loss of less than 0.1% and strength loss of 5% after 180 cycles was recorded by the Geopolymer Institute (2008).…”

Section: Other Propertiesmentioning

confidence: 99%

A state of the art review into the use of geopolymer cement for road applications

Wilkinson¹,

Woodward

Magee

et al. 2015

Bituminous Mixtures and Pavements VI

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This paper is a state of the art review of the use of geopolymer cement for road applications. Geopolymer cement is an alternative to Portland cement and is either naturally occurring rock-based or industrial by-product-based. Geopolymer cement has been around for at least the last 30 years. In recent years it has become an attractive potential alternative to Portland cement. The main reason for this renewed interest is the issue relating to the release of carbon dioxide into the atmosphere during the manufacture of Portland cement. It is estimated that 1 tonne of Portland cement produces approximately 1 tonne of CO 2 during its manufacture. The use of geopolymer cement can reduce this amount by as much as 90%. It is claimed that this will have a huge potential in reducing national targets in CO 2 emissions of many countries around the world. This state of the art review critically evaluates existing literature relating to these claims and focuses on the potential use of geopolymer concrete for road applications. In addition to environmental benefits, the existing literature suggests that geopolymer cement concrete has the potential to provide better mechanical properties than Portland cement concrete. Attractive properties include quicker compressive strength development, higher compressive and flexural strength, minimal shrinkage and resistance to chemical-attack and freeze-thaw cycles. The review will consider the different types of geopolymer cement, its properties and whether it can be used in road applications.

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“…The effect of LECA on the efficiency of GGBS-based concrete was investigated by Yang et al 15 The specimens were cured at room temperatures and compressive strength obtained for 28 days ranged from 3.3 to 19.1 MPa with a density of 775-1615 kg/ m 3 . Abdulkareem et al 16 investigated the influences of temperatures on the mechanical characteristics of lightweight geopolymer concrete (LWGC). They manufactured lightweight geopolymer concrete with fly ash as raw material, LECA as coarse aggregate, and normal sand as fine aggregate.…”

Section: Introductionmentioning

confidence: 99%

Residual mechanical performance of lightweight fiber-reinforced geopolymer mortar composites incorporating expanded clay after elevated temperatures

Aljanabi

Çevik

Niş

et al. 2022

Journal of Composite Materials

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This research provides an experimental investigation on the properties of fiber reinforced composite materials consisting of lightweight expanded clay aggregates (LECA) and polyvinyl alcohol (PVA) fibers. The influence of temperature (room temperature, 250°C, and 500°C) on the lightweight geopolymer mortar (LWGM) composite materials is also explored. LECA is used as a partial replacement to river sand with 60% and 80%. The base material utilized for LWGM is slag activated by a mixture of sodium silicate and sodium hydroxide solutions. The fresh properties in terms of workability and density were performed. A series of experiments, such as compression, flexural and uniaxial tensile strength tests, were executed to assess the mechanical properties of LWGM composite materials. In addition, the microscopic variations due to the elevated temperature were also evaluated by scanning electron microscopy (SEM) to understand the macro-scale behavior of the samples. The results indicated that increasing the level of LECA replacement caused a reduction in the density and compressive strength of the LWGM. Also, incorporating a 1% PVA fiber volume fraction significantly enhanced the flexural and uniaxial tensile behavior of LWGM composite materials. The compressive strength enhancements were observed at 250°C due to further geopolymerization, while compressive strength reductions were obtained at 500°C due to the vapor impact and difference in thermal expansion. In addition, the load-carrying capacity of all samples increased, and displacement capacity decreased under flexural tests at 250°C. However, the ductile behavior of the PVA incorporating specimens changed to brittle due to the melting of PVA fibers.

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Fire Resistance Evaluation of Lightweight Geopolymer Concrete System Exposed to Elevated Temperatures of 100-800 °C

Cited by 6 publications

References 11 publications

Elevated Temperature Effects on Geo-Polymer Concrete: An Experimental and Numerical-Review Study

Elevated Temperature Effects on Geo-Polymer Concrete: An Experimental and Numerical-Review Study

A state of the art review into the use of geopolymer cement for road applications

Residual mechanical performance of lightweight fiber-reinforced geopolymer mortar composites incorporating expanded clay after elevated temperatures

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