Size effect in self consolidating concrete beams with and without notches

Eskandari, Hamid; Muralidhara, Srinivasa; Raghuprasad, BK; Reddy, B. V. Venkatarama

doi:10.1007/s12046-010-0012-2

Cited by 43 publications

(11 citation statements)

References 24 publications

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“…Numerical methods such as the finite element and boundary element methods [9] are used to determine the stress intensity factor. These methods are applicable to the description of not only different size specimens but also specimens with varying geometry and strength [10,11].…”

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confidence: 99%

Numerical Analysis of Mode I Fracture Toughness for Plain Concrete Beams

ELSayed¹,

Gamiaa²

2020

Bulletin of the Faculty of Engineering. Mansoura University

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Fracture mechanics is based on the assumption that all engineering materials contain cracks from which failure starts. Structures have sizeable existing cracks that may or may not grow, depending on the load level. When a material has an existing crack, this leads to high stresses near the crack tip. Stress field type in the region of the crack tip can be defined as mode I, where two fracture surfaces are displaced perpendicular to each other in the opposite direction where crack growth takes place. The crack tip stress and displacement field can be uniquely characterized by the stress intensity factor, SIF; it is neither the magnitude of stress nor strain, but it is a unique parameter that describes the effect of loading at the crack tip region and the resistance of the material. The stress intensity factor is valid for a small region around the crack tip. It depends on both the values of stress and crack size. In the present work, numerical models were designed to study the effect of specimen thickness, crack-depth ratio and concrete compressive strength on the SIF in concrete beams. Nine beams were idealized with dimensions of 1500 mm length, 400 mm depth and different thicknesses 120, 250 and 400 mm. The crack-depth ratios were 0.1, 0.2 and 0.3 and the concrete compressive strengths were 25, 40 and 55 MPa. The results proved that there is a decrease in the SIF with increasing the specimen thickness. On the other

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mentioning

confidence: 99%

Numerical Analysis of Mode I Fracture Toughness for Plain Concrete Beams

ELSayed¹,

Gamiaa²

2020

Bulletin of the Faculty of Engineering. Mansoura University

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“…According to CEB-FIB [39], fracture energy can be related with compressive strength in the form of power function. Moreover, various investigators have suggested a direct relationship between these parameters [40,41]. As shown in Figure 11, fracture energy was directly proportional with compressive strength and the relationship could be expressed via the power equation below, with correlation coefficient ( 2 ) of 0.87: = 0.055…”

Section: Fracture Characteristicsmentioning

confidence: 99%

Strengths and Failure Characteristics of Self-Compacting Concrete Containing Recycled Waste Glass Aggregate

AL-Bawi

Kadhim

AL-Kerttani

2017

Advances in Materials Science and Engineering

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The effects of different proportions of green-colored waste glass (WG) cullet on the mechanical and fracture properties of selfcompacting concrete (SCC) were experimentally investigated. Waste bottles were collected, washed, crushed, and sieved to prepare the cullet used in this study. Cullet was incorporated at different percentages (0%, 20%, 40%, 60%, 80%, and 100% by weight) instead of natural fine aggregate (NFA) and/or natural coarse aggregate (NCA). Three SCC series were designed with a constant slump flow of 700 ± 30 mm, total binder content of 570 kg/m 3 and at water-to-binder (w/b) ratio of 0.35. Moreover, fly ash (FA) was used in concrete mixtures at 20% of total binder content. Mechanical aspects such as compressive, splitting tensile, and net flexural strengths and modulus of elasticity of SCC were investigated and experimentally computed at 28 days of age. Moreover, failure characteristics of the concretes were also monitored via three-point bending test on the notched beams. The findings revealed that the mechanical properties as well as fracture parameters were adversely influenced by incorporating of WG cullet. However, highest reduction of compressive strength did not exceed 43% recorded at 100% WG replacement level. Concretes containing WG showed less brittle behavior than reference concrete at any content.

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“…Another observation they made was in 2012, when they studied the fracture parameters by varying the depth of the notch and increasing the area of reinforced bars [34]. Eskandari et al [35] also concluded almost similar results but they also compared the results between beam specimens with and without notches.…”

Section: Discrete and Smeared Crack Modelmentioning

confidence: 99%

A Review on Studies of Fracture Parameters of Self-compacting Concrete

Rama

Sivakumar

Vasan

et al. 2015

Advances in Structural Engineering

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In the recent past, the use of self-compacting concrete (SSC) as a primary structural material in complex structures such as tall buildings, submerged structures, bridges, dams, liquid and gas containment structure has increased enormously. Proper understanding of the structural behavior of SCC is absolutely necessary in designing complex concrete structures. Due to the presence of microcracks and other inherent flaws, the strength of the concrete structure decreases. Engineering fracture mechanics can deliver the methodology to compensate the inadequacies of conventional design concepts. It might be expected that SCC would exhibit more brittle behavior than normal/conventional concrete. The improved pore structure and better densification of matrix have great influence on the fracture characteristics of SCC. It is widely agreed that the strength, elastic modulus and fracture resistance of SCC decreases slightly with increased paste content. Increasing the volume of paste tends to make SCC brittle. Due to the quasi-brittle nature of concrete; various computational fracture models have been developed to study the crack characterizing parameters in concrete structures, such as fictitious crack model, crack band model, two parameter fracture model, size effect model, smeared crack model, cohesive crack band model and effective crack model. Compared to conventional vibrated concrete, self-compacting concrete often has a higher susceptibility to crack due to different mixture design, material properties and construction practices. Many studies have addressed the SCC fracture properties using different computational models. As mentioned above, all these studies are purely computational and there is no support or evidence from the experiments. This paper deals with presenting the various models as well as experimental investigations that have already been conducted by some of the researchers to study the exposure of self-compacting concrete to crack.

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Size effect in self consolidating concrete beams with and without notches

Cited by 43 publications

References 24 publications

Numerical Analysis of Mode I Fracture Toughness for Plain Concrete Beams

Numerical Analysis of Mode I Fracture Toughness for Plain Concrete Beams

Strengths and Failure Characteristics of Self-Compacting Concrete Containing Recycled Waste Glass Aggregate

A Review on Studies of Fracture Parameters of Self-compacting Concrete

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