Impact of Elevated Temperatures on the Performance of High-Strength Engineered Cementitious Composite

He, Jianqiang; Wang, Qing; Yao, Boyu; Ho, J.C.M.

doi:10.1061/(asce)mt.1943-5533.0003812

Cited by 8 publications

(4 citation statements)

References 54 publications

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“…Up to 800 0 C, considerable weight loss occurred is seen for all the mixes. Due to the denser formation in the cementitious system, which leads to decreases hydrates decomposition rate, mass loss is lower than higher particle sizes at all exposure temperatures for 28 and 90 days [18]. Due to reduced water in the microstructure of RS-ECC, mass loss is somewhat lower at 90 days than 28 days [32].…”

Section: Ultrasonic Pulse Velocitymentioning

confidence: 89%

“…Fibers are no longer visible as the heating temperature increases to 400 0 C; Instead, needle-like channels developed in the PVA fiber sites. These channels offered additional pathways for water evaporation and energy dissipation, which contributed to the avoidance of spalling, longitudinal empty channels may function as an initial flaw in RS-ECC, facilitating the development of microcracks [18].…”

Section: Microstructure Of Compositementioning

confidence: 99%

“…Interestingly, the channels eventually fill with newly produced compounds, potentially affecting the Pore coarsening effect of cementitious composites at high temperatures. The connections and frictional forces are considerably decreased, resulting in severe damage to the strength of RS-ECC [18]. The FA had completely melted when the temperature reached 800 0 C. In the microstructure, more micro-pores from the inner FA are exposed, and dehydrated C-S-H gels, which are completely covered in melted FA, are not visible.…”

Section: Microstructure Of Compositementioning

confidence: 99%

“…However, characterization of the mechanical behaviour of fiber reinforced cementitious composites under high temperature is developed, in that quartz sand is used instead of micro silica sand [17]. Another study performed on high strength ECC under impact of elevated temperatures, RS of 2 mm particle size is used [18]. One more study conduced on effect of elevated temperatures on nano-silica-modified self-consolidating ECC, as a fine aggregate RS of an average size of 450 microns is used [19], but the effect of various particle sizes at high temperatures has not been well understood.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Elevated Temperature on Engineered Cementitious Composites using Natural River Sand

Naveen

Bhat

2022

IJE

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Engineered cementitious composites (ECC) is a recent construction material with better properties than conventional concrete. Currently, post-earthquake, fire in a building is one of the most serious disasters. The amount and size of sand used in ECC are important parameters for the performance under thermal conditions. Micro silica sand is utilized in the majority of ECC experiments related to thermal response. The study aim is to explore the impact of river sand (RS) on the ECC performance exposed to elevate temperatures up to 800 0 C, through a series of experimental tests on compressive strength, mass losses, ultrasonic pulse velocity (UPV) and microstructure. For this purpose, mixes were prepared with the incorporation of RS with varying particle sizes (2.36mm, 1.18mm, 0.60mm) instead of micro silica sand. There's no spalling in ECC containing RS of varying particle sizes. The compressive strength, mass loss and UPV all reduced with increasing temperature, according to the findings. However, RS-ECC performs better with 0.60mm than 1.18mm and 2.36mm RS.

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Section: Ultrasonic Pulse Velocitymentioning

confidence: 89%

Section: Microstructure Of Compositementioning

confidence: 99%

Section: Microstructure Of Compositementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Elevated Temperature on Engineered Cementitious Composites using Natural River Sand

Naveen

Bhat

2022

IJE

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Effect of specimen size and shape on the compressive performance of high strength engineered cementitious composites at elevated temperatures

Rawat,

Zhang,

Lee

2024

Innov. Infrastruct. Solut.

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This study provides detailed insights into the effect of specimen size on the residual compressive strength of hybrid polyethylene-steel fibre reinforced high strength engineered cementitious composite after exposure to elevated temperatures. A mix design with high residual performance was selected and a total of 120 specimens with different cross-section shape (square and circular), aspect ratio (1 and 2) and sizes (cylinders of 40 mm, 75 mm, 100 mm, 150 mm diameter with height to diameter ratio of 2:1, cubes of 50 mm, 75 mm, 100 mm side and prism of size 75 × 75 × 150 mm) were cast. These specimens were subjected to temperatures ranging from 200 to 800 °C and the residual compressive strength and change in microstructure was then analysed after air cooling. Experimental results indicated that cubic specimens experienced less strength loss compared to prism specimens with the same cross-sectional area and the damage was found to decrease with increase in the volume to surface area ratio of the specimens. Furthermore, no spalling occurred in any of the specimens despite the change in specimen size or cross-section. Unlike previous studies that did not present any clear influence of specimen size, the present work established that the residual strength is dependent on aspect ratio and volume to surface area ratio of the specimen. As a result, these findings are valuable for selecting appropriate specimen size in elevated temperature studies and for the development of suitable guidelines to facilitate meaningful comparisons with the existing data.

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Mechanical properties and microstructures of Steel-basalt hybrid fibers reinforced Cement-based composites exposed to high temperatures

Cao

Liu

et al. 2022

Construction and Building Materials

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Impact of Elevated Temperatures on the Performance of High-Strength Engineered Cementitious Composite

Cited by 8 publications

References 54 publications

Effect of Elevated Temperature on Engineered Cementitious Composites using Natural River Sand

Effect of Elevated Temperature on Engineered Cementitious Composites using Natural River Sand

Effect of specimen size and shape on the compressive performance of high strength engineered cementitious composites at elevated temperatures

Mechanical properties and microstructures of Steel-basalt hybrid fibers reinforced Cement-based composites exposed to high temperatures

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