The effect of nanosilica incorporation on the mechanical properties of concrete exposed to elevated temperature: a review

Nasser, Ibrahim M; Ibrahim, Mohd Haziman Wan; Zuki, Sharifah Salwa Mohd; Algaifi, Hassan Amer; Alshalif, Abdullah Faisal

doi:10.1007/s11356-021-18310-8

Cited by 5 publications

(2 citation statements)

References 109 publications

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“…This study will present and analyze the different equations from the codes and the literature regarding the mechanical properties of concrete. Other reviews on the subject of concrete exposed to elevated temperature effects [ 19 , 20 , 21 ], are more specific about one type of concrete or one constituent. For instance, such reviews discuss steel fibers, polypropylene fibers, or nanosilica and do not include clear comparisons and data on the effects of cooling methods.…”

Section: Introductionmentioning

confidence: 99%

Performance of Different Concrete Types Exposed to Elevated Temperatures: A Review

et al. 2022

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Concrete is a heterogeneous material that consists of cement, aggregates, and water as basic constituents. Several cementitious materials and additives are added with different volumetric ratios to improve the strength and durability requirements of concrete. Consequently, performance of concrete when exposed to elevated temperature is greatly affected by the concrete type. Moreover, post-fire properties of concrete are influenced by the constituents of each concrete type. Heating rate, days of curing, type of curing, cooling method, and constituents of the mix are some of the factors that impact the post-fire behavior of concrete structures. In this paper, an extensive review was conducted and focused on the effect of concrete constituents on the overall behavior of concrete when exposed to elevated temperature. It was evident that utilizing fibers can improve the tensile capacity of concrete after exposure to higher temperatures. However, there is an increased risk of spalling due to the induced internal stresses. In addition, supplementary cementitious materials such as metakaolin and silica fume enhanced concrete strength, the latter proving to be the most effective. In terms of the heating process, it was clear that several constituents, such as silica fume or fly ash, that decrease absorption affect overall workability, increase the compressive strength of concrete, and can yield an increase in the strength of concrete at 200 °C. Most of the concrete types show a moderate and steady decrease in the strength up until 400 °C. However, the decrease is more rapid until the concrete reaches 800 °C or 1000 °C at which it spalls or cannot take any applied load. This review highlighted the need for more research and codes’ provisions to account for different types of concrete constituents and advanced construction materials technology.

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Section: Introductionmentioning

confidence: 99%

Performance of Different Concrete Types Exposed to Elevated Temperatures: A Review

et al. 2022

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“…Reinforced concrete (RC) structures made of traditional concrete, unlike structures made of other construction materials such as steel, have good fire resistance, which can be attributed to low conductivity, greater temperature capacity, and slower degradation of tensile properties with temperature [5,6]. However, owing to changes in microstructure that occur during fire exposure, the newest concrete types, especially High-Strength Concrete (HSC) and Ultra High-Strength Concrete (UHPC), show quicker strength decline, culminating in concrete spalling [1,7].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of spalling effect of elevated temperature on concrete containing waste plastic aggregates

Pawar¹,

Sangle²,

Bhirud³

2022

Res. Eng. Struct. Mater.

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Fire spalling significantly increases the overall heat deformation of a firedamaged building, resulting in significantly greater repair costs and, in certain situations, jeopardizing structural stability owing to the loss of reinforcing protection and lowering of bearing cross-sections. Due to intrinsic material characteristics such as unstable fracture behavior and limited permeability, elevated concrete is particularly susceptible to shear. Hence in this paper to improve the thermal stability of structures, aggregate waste plastics are added to the concrete to reduce the pore pressure generated inside the concrete subjected to a thermal environment. Here plastics are added to the concrete mix in various weight proportions as 0%, 10%, 20%, 30% and 40% thereby fabricating three types of specimens as cube, cylinder and beam which are then checked for volumetric degradation stability subjected to various thermal gradients like normal temperature, 600°C and 800°C respectively. Finally, the spalling of concrete at various plastic proportions under varying environments are investigated and the best way to incorporate plastic waste aggregates into concrete is explored.

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Mechanical properties of nano-SiO2 reinforced engineered cementitious composites after exposure to high temperatures

Zhang

Han²,

Wu³

et al. 2022

Construction and Building Materials

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The effect of nanosilica incorporation on the mechanical properties of concrete exposed to elevated temperature: a review

Cited by 5 publications

References 109 publications

Performance of Different Concrete Types Exposed to Elevated Temperatures: A Review

Performance of Different Concrete Types Exposed to Elevated Temperatures: A Review

Experimental investigation of spalling effect of elevated temperature on concrete containing waste plastic aggregates

Mechanical properties of nano-SiO2 reinforced engineered cementitious composites after exposure to high temperatures

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