Impact of external biaxial compressive loading on the fire spalling behavior of normal-strength concrete

Miah, Md Jihad; Monte, Francesco Lo; Felicetti, Roberto; Pimienta, Pierre; Carré, Hélène; Borderie, Christian La

doi:10.1016/j.conbuildmat.2022.130264

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…The test data were used to establish the fitting curves of residual bond strength of HN and HF specimens, as shown in Figure 11. The fitting relationships were given by Equations [2] and [3].…”

Section: Residual Bond Strengthmentioning

confidence: 99%

“…[2] [3] Where τ 20 was the bond strength of specimens after exposure to 20 °C, MPa; τ T was the bond strength of specimens after exposure to high temperature, MPa; T was temperature, °C. Figure 12 shows the bond-slip curves.…”

Section: Residual Bond Strengthmentioning

confidence: 99%

“…Fire and high temperature can cause thermal stress and rapid evaporation of water in building structures, which can increase the internal pore pressure and lead to irreversible, permanent damage such as explosion and spalling (1,2). To minimize the damage, the building structures after fire exposure need to have sufficient strength, stiffness, and stability (3,4). Therefore, enhancing the high-temperature resistance of concrete structures has become a research hotspot.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the bond properties between hybrid fiberreinforced concrete and BFRP bars after exposure to high temperature

Liu,

et al. 2024

Mater. constr.

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This research investigated the bond properties at high temperatures and with hybrid fiber addition between basalt fiber reinforced polymer (BFRP) bars and hybrid fiber-reinforced concrete (HFRC). The tensile strength and appearance morphology of BFRP bars were analyzed. Used scanning electron microscopy (SEM) to examine the microscopic morphology and used the bond-slip constitutive model to fit the bond-slip curves. When BFRP bars after exposed to 300 °C, their tensile strength dropped by 42%. With the increasing temperature, the bond strength and stiffness of normal concrete (NC) specimens decreased by 27.3 % and 67.5 %, respectively, while HFRC specimens decreased by 20.8 % and 55 %, respectively. Hybrid fibers increased the bond strength and stiffness of HFRC specimens by 27.1 % and 49.1 %, respectively. The best fitting models were the Malvar model and the Continuous Curve model.

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Section: Residual Bond Strengthmentioning

confidence: 99%

Section: Residual Bond Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of the bond properties between hybrid fiberreinforced concrete and BFRP bars after exposure to high temperature

Liu,

et al. 2024

Mater. constr.

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Influence of fire severity and concrete properties on the thermo‐hygral behavior of concrete during fire exposure

Pulkit,

Adhikary,

Kodur

2024

Structural Concrete

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Since the world is transitioning toward performance based design, the study of thermo‐hygral behavior of concrete when subjected to real fire becomes crucial. Fire accidents have revealed that nominal fire curves cannot be applied because of varying severity of real fire. In 2008, traveling fire concept was developed in which severity is dependent on heat release rate and fire size. This study explores the effect of fire severity and other concrete properties like strength, aggregate type, and relative humidity. The proposed model has been developed by combining the principles of mechanics and thermodynamics and upon validation with the experimental results, a reasonable agreement has been observed. It can be concluded that severity of fire is directly related to thermo‐hygral behavior of concrete. On the other hand, this study also highlights the influence of type of aggregate and moisture content in addition to the traditional variables like volume fraction of solid and permeability. On studying the influence of type of aggregate, it can be concluded that recycled aggregate concrete performed better than conventional concrete. The integration of proposed model in the performance based design is a leap toward development of resilient structure subjected to dynamic fire conditions.

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Long-term strength and durability performance of eco-friendly concrete with supplementary cementitious materials

Miah,

Huaping,

Paul

et al. 2023

Innov. Infrastruct. Solut.

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Research has shown that adding supplementary cementitious materials (SCMs), such as fly ash (FA) and slag (SL), to concrete improves its mechanical and durability properties up to certain limits. However, the long-term performance of concrete made with FA and SL is not fully known. This study investigates the impact of FA and SL on the long-term (up to 900 days) performance of concrete. The concrete specimens were made with six replacement percentages (0, 10, 20, 30, 45 and 60 by weight) of ordinary Portland cement (OPC). The short-term fresh and hardened properties of all concrete mixes were assessed after 14, 28, 60, and 90 days of water curing. After 120, 365, 730, and 900 days of water curing, the long-term performance was investigated for 100% OPC (control), 30% FA, and 30% SL concretes. At 28 days, no significant difference in strength development was observed for the concrete mixes containing up to 30% FA and 30% SL than the control concrete (100% OPC). In contrast, a remarkable enhancement in strength development was registered for all mixes containing up to 30% FA and 30% SL at 60 and 90 days of tests. Likewise, 30% FA and 30% SL showed the lowest porosity and water absorption than the control. The mechanical strength of concrete prepared with 30% FA and 30% SL gradually rises over time (from 14 to 900 days) compared to the control concrete. With increasing concrete age, a reduction in porosity and capillary water absorption was seen (up to 900 days).

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Impact of external biaxial compressive loading on the fire spalling behavior of normal-strength concrete

Cited by 7 publications

References 34 publications

Investigation of the bond properties between hybrid fiberreinforced concrete and BFRP bars after exposure to high temperature

Investigation of the bond properties between hybrid fiberreinforced concrete and BFRP bars after exposure to high temperature

Influence of fire severity and concrete properties on the thermo‐hygral behavior of concrete during fire exposure

Long-term strength and durability performance of eco-friendly concrete with supplementary cementitious materials

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