Specimen size effect on the residual properties of engineered cementitious composites subjected to high temperatures

Erdem, Tahir Kemal

doi:10.1016/j.cemconcomp.2013.09.019

Cited by 64 publications

(27 citation statements)

References 15 publications

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“…The strength of brittle and defect‐sensitive materials such as concrete is governed by the volume and size of the tested specimen . This “size effect” phenomenon reflects the fact that the probability of finding a crack of critical size and orientation increases with the volume of the specimen . This is in agreement with Bazant's size effect law (SEL) theory, which states that as the specimen size increases, the compressive strength decreases …”

Section: Introductionsupporting

confidence: 67%

Specimens size, aggregate size, and aggregate type effect on spalling of concrete in fire

2017

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SummaryThis paper attempted to isolate variables that govern concrete spalling when exposed to a hydrocarbon fire. The influence of specimen size was investigated by studying 4 specimen sizes consisting of cylinders, columns, and panels. Three aggregate sizes, 7 mm, 14 mm, and 20 mm were used in the concrete mixes to determine their effect on concrete spalling. Influence of aggregate type on concrete spalling was also investigated. Forty-two different specimens were considered in this investigation. Concrete spalling was quantified as nominal spalling depth, which has been presented as a new way of quantifying the degree of concrete spalling. The results indicated that specimen size did have an effect on the spalling of concrete under hydrocarbon fire exposure and that nominal spalling depth of concrete increases as the specimen size increases.Aggregate size effect was evident when the maximum aggregate size increased from 7 mm to 20 mm, and explosive spalling was more severe for specimens with small size aggregates. Specimens with 14-mm aggregate size showed inconsistent results and the spalling behavior witnessed was more random and sporadic. The type of aggregate used has no clear bearing on concrete spalling given both aggregates had similar linear expansion profiles. However, concrete is susceptible to a less known phenomenon termed spalling in fire. Spalling of concrete in fire is the dislodgement of small pieces of concrete up to 50 mm (popping out) from the surface of the concrete, often explosive in nature. If the degree of spalling is significant, the load bearing capacity of the concrete member can be reduced due to (1) reduction in its cross-sectional size, and (2) rapid increase in temperatures of the reinforcement. more predominate when concrete is subjected to hydrocarbon fire due to the rapid heating rise. 5 The moisture content of the specimen has been reported to be a significant factor which governs spalling. 6High levels of moisture content generate the buildup of pore water pressures.A number of key researchers have studied the factors which govern spalling including thermal stresses, pore pressures, thermal dilation, and incompatibility between cement paste and aggregate. 7-10 The "moisture-clog mechanism" due to the buildup of pore water pressures has been widely accepted as the main mechanism causing concrete spalling. 9,[11][12][13][14][15][16][17] Contrary to this, spalling caused by differential thermal gradients within the concrete element has also been widely accepted to explain the spalling phenomenon. crack of critical size and orientation increases with the volume of the specimen. [22][23][24] This is in agreement with Bazant's size effect law (SEL) theory, which states that as the specimen size increases, the compressive strength decreases. 23,25,26 In relation to spalling, the "size effect" phenomenon has a direct effect on the moisture content of the concrete specimen, the rate of in situ heating, and water mass loss. | EXPERIMENTAL PROGRAMMEThe materials used in this investig...

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Section: Introductionsupporting

confidence: 67%

Specimens size, aggregate size, and aggregate type effect on spalling of concrete in fire

2017

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“…The specimen size effect and temperature influence on the residual compression properties of ECC specimens were studied by Erdem [14]. Mechtcherine et al [15] have studied the effect of temperatures up to 150°C, with different strain rates and combinations of these parameters on the mechanical behavior of SHCC.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability of PVA fiber strain hardening cement-based composites

Magalhães

Filho

Fairbairn

2015

Construction and Building Materials

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“…Extremely polyvinyl alcohol (PVA) fiber have been used to reinforce engineered cementitious matrix [17][18][19]. Hydrophilic nature of PVA fiber in cementitious matrix develop strong chemical bond.…”

Section: Introductionmentioning

confidence: 99%

Appraisal of Hybrid Fiber Reinforced Engineered Cementitious Composite

Singh¹,

Saini²,

Chalak³

2019

Proceedings of the 4th International Conference on Civil, Structural and Transportation Engineering (ICCSTE'19)

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Mortar based engineered cementitious composite (ECC) demonstrate strain hardening behaviour with multiple micro-cracks under tension. The distinctive behaviour of ECC, makes it ductile as compared to brittle nature of conventional concrete. Ductile nature of ECC, makes it applicable in seismic resistant, repairing and retrofitting areas and blast resistant structural elements. In the present investigation, two types of polymer fibers (i.e. polyester (PET) fiber and polyvinyl alcohol (PVA) fiber) have been used in hybridization with different percentages (2+0), (2+0.5), (1.75+0.5), (1.5+0.5) for making ECC. Also fly ash, 55% of the total cementitious material, has been used for making sustainable concrete. The compressive, flexural and tensile tests were performed to evaluate the mechanical behaviour of hybrid fiber reinforced cementitious matrix. The test results revealed that PET fiber and PVA fiber in combination enhanced the strength properties of ECC by bridging effect of hybrid fibers.

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Specimen size effect on the residual properties of engineered cementitious composites subjected to high temperatures

Cited by 64 publications

References 15 publications

Specimens size, aggregate size, and aggregate type effect on spalling of concrete in fire

Specimens size, aggregate size, and aggregate type effect on spalling of concrete in fire

Thermal stability of PVA fiber strain hardening cement-based composites

Appraisal of Hybrid Fiber Reinforced Engineered Cementitious Composite

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