Size effect on flexural, splitting tensile, and torsional strengths of high-strength concrete

Zhou, Fan; Balendran, R.V.; Jeary, Alan

doi:10.1016/s0008-8846(98)00157-4

Cited by 46 publications

(21 citation statements)

References 6 publications

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“…This type of failure is similar to that of concrete members under concentric bearing loading . The size effect was not observed in certain tests, and a reverse size effect was even observed in certain historical experiments . Consequently, the investigators who observed this extraordinary behaviour concluded that the size effect is highly dependent on the load‐distributed widths for these types of specimens.…”

Section: Comparison With Previous Studiesmentioning

confidence: 61%

The Effect of Size on the Splitting Strength of Cubic Concrete Members

İnce

Gör

Eren

et al. 2014

Strain

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In the study of concrete fractures, split-tension specimens, such as cylinders, cubes and diagonal cubes, are frequently preferred to beams. However, experimental investigations on concrete reveal that for the same specimen geometry, the nominal strength of specimen decreases with increasing specimen size. This phenomenon is named as the size effect in the fracture mechanics of concrete. Although nominal strength is also highly affected by the width of the distributed load in the split-tension cylinder and cube specimens, this effect can be negligible within the practical range of the load-distributed width in the diagonal cubes. However, the number of theoretical and experimental studies with diagonal split-tension specimens is limited. Besides, a size effect formula for estimating the split-tensile strength of the diagonal cube specimens has not been proposed. In this study, nine series of cube and diagonal cube specimens, with three different sizes but similar geometries, were tested under different load-distributed widths. The ultimate loads obtained from the test results are analysed by the modified size effect law. Subsequently, prediction formulas are proposed, and they are compared with historical test data from the split-cylinder specimens.

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Section: Comparison With Previous Studiesmentioning

confidence: 61%

The Effect of Size on the Splitting Strength of Cubic Concrete Members

İnce

Gör

Eren

et al. 2014

Strain

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“…Zhou et al . reported that the replacement of the normal aggregate in High Strength Concrete (HSC) with the lightweight aggregate results in a 22% reduction in the CS.…”

Section: Resultsmentioning

confidence: 99%

“…Many investigators such as Akman and Taşdemir, Ramamurty and Narayanan, and Faust have reported that the decrease in density causes the reduction of the CS [33][34][35]. Zhou et al [36] reported that the replacement of the normal aggregate in High Strength Concrete (HSC) with the lightweight aggregate results in a 22% reduction in the CS.…”

Section: Absorption After Elevated Temperature Exposure Figures 3-5 mentioning

confidence: 99%

Effect of glass fiber‐reinforced polymer and epoxy injection on compressive strength of elevated temperature damaged concrete

Demirboğa

Kaygusuz²,

Polat

2012

Fire and Materials

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SUMMARY Glass fiber‐reinforced polymer (GFRP) materials have received a great deal of interest among civil engineers during the past decade. This paper presents an overview of experimental studies carried out on GFRP‐wrapped and epoxy‐injected concrete samples exposed to elevated temperatures. For this purpose, 0.30, 0.35 and 0.40 water to binder (w/b) ratios were used. For each w/b ratio, normal aggregates were replaced by lightweight aggregates with a size fraction of 0–2 mm at three different volume fractions such as 10%, 20% and 30% of total aggregate volume. At the same time, a group of air‐entrained samples was also cast for each w/b ratios. Prepared samples were exposed to 600 °C for 3 h. The damaged samples were separately repaired by GFRP and epoxy injection. Before and after elevated temperature exposure, water absorption and compressive strength were tested. After repairing with GFRP and epoxy injection, only the compressive strength test was carried out. GFRP improved the compressive strength between 1–22% and 348–1403% for samples before and after being exposed to elevated temperatures, respectively. Epoxy injection increased the compressive strength of the samples, exposed to elevated temperature, between 1% and 123%. However, the epoxy injection process failed to recover the compressive strength of the samples before elevated temperature exposure. Copyright © 2012 John Wiley & Sons, Ltd.

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“…A beam length of 250 mm rather than the length of 840 mm recommended by RILEM [16] was used to suit the internal dimensions of the furnace. Results of Brokenshire and Barr [23], and Zhou and Balendran [24] for normal temperature conditions have shown that there was no appreciable difference in the measured fracture energy due to such a size change. All the samples were kept in a controlled room at 25 °C and 60 percent RH prior to heating.…”

Section: Methodsmentioning

confidence: 99%

Fracture Properties of Polystyrene Aggregate Concrete after Exposure to High Temperatures

2016

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This paper mainly reports an experimental investigation on the residual mechanical and fracture properties of polystyrene aggregate concrete (PAC) after exposure to high temperatures up to 800 degrees Celsius. The fracture properties namely, the critical stress intensity factor (KICS), the critical crack tip opening displacement (CTODC) for the Two-Parameter Model, and the fracture energy (GF) for the Fictitious Crack Model were examined using the three-point bending notched beam test, according to the RILEM recommendations. The effects of polystyrene aggregate (PA) content and temperature levels on the fracture and mechanical properties of concrete were investigated. The results showed that the mechanical properties of PAC significantly decreased with increase in temperature level and the extent of which depended on the PA content in the mixture. However, at a very high temperature of 800 °C, all samples showed 80 percent reduction in modulus of elasticity compared to room temperature, regardless of the level of PA content. Fracture properties of control concrete (C) and PAC were influenced by temperature in a similar manner. Increasing temperature from 25 °C to 500 °C caused almost 50% reduction of the fracture energy for all samples while 30% increase in fracture energy was occurred when the temperature increased from 500 °C to 800 °C. It was found that adding more PA content in the mixture lead to a more ductile behaviour of concrete.

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Size effect on flexural, splitting tensile, and torsional strengths of high-strength concrete

Cited by 46 publications

References 6 publications

The Effect of Size on the Splitting Strength of Cubic Concrete Members

The Effect of Size on the Splitting Strength of Cubic Concrete Members

Effect of glass fiber‐reinforced polymer and epoxy injection on compressive strength of elevated temperature damaged concrete

Fracture Properties of Polystyrene Aggregate Concrete after Exposure to High Temperatures

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