Experimental evaluation of fire resistance performance of cement mortar with PCM/Mg(OH)2-based composite fine aggregate

Yoo, Dong Ho; Jeon, In Kyu; Kim, Hong Gi; Lee, Jun Suk; Ryou, Jae-Suk

doi:10.1016/j.conbuildmat.2021.123018

Cited by 14 publications

(5 citation statements)

References 32 publications

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“…The hydration products of the ASCCM (hydrotalcite and calcium silicate hydrate) exhibited better high-temperature stability. Furthermore, the thermal incompatibility between the aggregate and matrix of concrete was a critical cause of the decline in strength (Yoo et al, 2021; Zhang et al, 2020). In contrast, both the aggregate and paste of the ASCCM were AASCM materials.…”

Section: Resultsmentioning

confidence: 99%

“…At 300°C, microcracks form in concrete due to thermal incompatibility and the dehydration of calcium silicate hydrate. This damages the interface between the aggregate and matrix (Yoo et al, 2021; Zhang et al, 2020). When subjected to heat, the shrinkage of AASCM is more significant than that of cement, rendering thermal incompatibility to be more significant (Guerrieri et al, 2009; Hassanet al, 2022; Tu and Zhang, 2023).…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on high-temperature resistance of alkali-activated slag concrete block masonry

Huang,

Zheng,

Wang

2023

Advances in Structural Engineering

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The use of blast furnace slag improves resource utilization and supports the achievement of sustainable development goals. The use of alkali-activated slag cementitious material (AASCM) provides a new direction for improving the fire resistance of masonry structures. The masonry investigated in this study was alkali-activated slag crushed aggregate concrete masonry (ASCCM) in which aggregates of blocks and mortars were crushed and screened using AASCM paste specimens. The compression behavior of 12 specimens during and after exposure to high temperatures, specifically 300, 500, 600, 700, 800, and 900°C was investigated. The specimens were maintained under the target temperature for 2 h. The compressive strength and axial deformation of the specimen were recorded. The compressive strength losses during exposure to 300, 500, 600, 700, 800, and 900°C are 15.9, 20.3, 38.3, 43.9, 63.3 and 73.8%, respectively. The compressive strength losses after exposure to 300, 500, 600, 700, 800, and 900°C are 10.6, 15.8, 34.0, 37.2, 58.6 and 72.2%, respectively. The rate of loss in elastic modulus is greater than that in compressive strength. During exposure to 300, 500, 600, 700, 800, and 900°C, the loss rates of elastic modulus are 56.5, 74.4, 83.3, 86.3, 92.9 and 93.9%, respectively. After exposure to 300, 500, 600, 700, 800, and 900°C, the loss rates of elastic modulus are 49.6, 67.3, 77.5, 82.0, 90.7 and 94.5%, respectively. The peak compressive strain values are 9.9 and 11.1 times that at room temperature. Equations for calculating the compressive strength, elastic modulus, peak compressive strain, and ascending section curve of the stress–strain relationship with temperature were derived. The research results provide a new choice for high temperature resistant masonry materials, and provide theoretical basis and data support for the application of AASCM in masonry structures in high-temperature environments.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study on high-temperature resistance of alkali-activated slag concrete block masonry

Huang,

Zheng,

Wang

2023

Advances in Structural Engineering

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“…The use of PCM in concrete can improve its high thermal resistance. The PCM hinders the increasing temperature of concrete because it absorbs heat during two steps of their phase changing, solid to liquid (around melting point) and liquid to gas (around flash point) [ 16 ]. Therefore, an internal temperature measurement was conducted with the furnace temperature set at 1000 °C.…”

Section: Methodsmentioning

confidence: 99%

Investigation of Newly Developed PCM/SiC Composite Aggregate to Improve Residual Performance after Exposure to High Temperature

Yoo

Lee

et al. 2022

Materials

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High temperature conditions, such as fire, are detrimental factors to the mechanical and chemical properties of concrete. In this paper, the authors developed a new type of coarse aggregate, named PCM/SiC composite aggregate (enhanced aggregate: EA), to improve fire-resistance performance. To investigate the validity of EA for construction materials, a compressive strength test, static modulus of elasticity, X-ray diffraction (XRD), and scanning electron microscopy (SEM) were conducted. In addition, this EA has been developed to improve residual performance after exposure to high temperature, with residual compressive strength and internal temperature measurement tested at 1000 °C. Furthermore, chemical properties after heating were investigated by XRD and SEM-EDAX. The results show that the percentage of residual compressive strength of heated concrete with EA is higher than plain concrete. The concrete with EA exhibited primary cement composites such as C-H and C-S-H after exposure to high temperature through XRD and SEM-EDAX. On the other hand, major hydration products could not be observed in plain concrete. PCM and SiC offer an opportunity to delay the increase in concrete temperature. From evaluation of the results, we can see that EA enhanced the residual performance of concrete after exposure to high temperature conditions.

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“…Several studies have also focused on the fire properties of building materials containing PCM. Some have researched plasterboards [ 14 , 40 ], and others have researched plasters [ 15 , 41 ]. Using new types of PCM [ 42 , 43 ], improved coatings [ 41 ], or bio-PCM [ 40 ], it is possible to increase the fire resistance of a structure.…”

Section: Introductionmentioning

confidence: 99%

“…Some have researched plasterboards [ 14 , 40 ], and others have researched plasters [ 15 , 41 ]. Using new types of PCM [ 42 , 43 ], improved coatings [ 41 ], or bio-PCM [ 40 ], it is possible to increase the fire resistance of a structure. To determine the usability of a plaster in the interior, the reaction to fire class is also important, which this paper will extend beyond the mentioned research.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, Thermal, and Fire Properties of Composite Materials Based on Gypsum and PCM

et al. 2022

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One of the solutions for overheating the interior in the summer without increasing energy consumption is the integration of phase change material (PCM) into interior plasters. However, adding PCM to plasters deteriorates their properties and thus their usability. The aim of this paper is to determine how the microencapsulated PCM affects the mechanical, thermal, and fire properties of plasters and how much PCM can be added to the plaster. Two sets of samples were prepared: in set S, part of the aggregate was replaced by PCM; and in set R, only PCM was added. The bulk density, flexural strength, compressive strength, tensile strength perpendicular to the surface, thermal conductivity coefficient, specific heat capacity, melting, and solidification temperatures and enthalpy were measured. A single-flame source fire test and a gross heat of combustion fire test were performed to determine the reaction to the fire class. The results show that with an increasing proportion of PCM, the strength of the samples of set R decreased more significantly than it did with the samples of set S. It was found that only up to about 10% PCM could be added to set R, while up to 30% PCM could be added to set S.

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Experimental evaluation of fire resistance performance of cement mortar with PCM/Mg(OH)2-based composite fine aggregate

Cited by 14 publications

References 32 publications

Experimental study on high-temperature resistance of alkali-activated slag concrete block masonry

Experimental study on high-temperature resistance of alkali-activated slag concrete block masonry

Investigation of Newly Developed PCM/SiC Composite Aggregate to Improve Residual Performance after Exposure to High Temperature

Mechanical, Thermal, and Fire Properties of Composite Materials Based on Gypsum and PCM

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