Fracture Energy of Foamed Concrete Based on Three-Point Bending Test on Notched Beams

Foamed concrete is lightweight concrete formulated from a mixture of concrete mortar and established foam. Generally foamed concrete is known for its low engineering properties. Many researchers had conducted studies and more focused on the physical and mechanical properties of foamed concrete without taking into account the behavior on its fracture energy. Therefore, this study was carried out to investigate the effect of notch-to-depth ratio on fracture energy of foam concrete using three point bending testmethod. Beam specimens with V-notch were prepared at a densityof 1400kg/m3 and 1600kg/m3. Three different notch-to-depth ratios which were adopted at 0.1, 0.3 and 0.5. Fracture energy was determined using Hillerborg, Bazant and Comitee euro International du Beton (CEB) models. From the experimental results, it was shown that fracture energy decreases asthe notch-to-depth ratio increases.

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Numerical Study of Crack Propagation Path in Three-Point Bending Beam Using Extended Finite Element Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.353-356.3615 ◽

2013 ◽

Vol 353-356 ◽

pp. 3615-3618 ◽

Cited By ~ 1

Author(s):

Cheng Fan ◽

Xue Qing Jing

Keyword(s):

Finite Element ◽

Fracture Energy ◽

Numerical Study ◽

Peak Stress ◽

Bending Test ◽

Propagation Path ◽

Extended Finite Element ◽

Basic Principles ◽

Three Point Bending ◽

Expansion Path

This paper is based on the basic principles of the extended finite element in the large commercial software ABAQUS on the platform of different fracture energy of three point bending test of concrete are numerically simulated, and three-point bending crack initiation, through expansion path analysis. The results show that has a direct impact on the size of the fracture energy of concrete specimens destruction, Fracture of brittle fracture can be small more obvious, produce more harmful. When softening decline stage after peak stress occurred in the "jump back" phenomenon.

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Fracture properties of GGBS-dolomite geopolymer concrete

Journal of Engineering Design and Technology ◽

10.1108/jedt-10-2021-0520 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Saranya P. ◽

Praveen Nagarajan ◽

A.P. Shashikala

Keyword(s):

Fracture Energy ◽

Design Methodology ◽

Characteristic Length ◽

Peak Load ◽

Critical Stress Intensity Factor ◽

Bending Test ◽

Geopolymer Concrete ◽

Content Type ◽

Fracture Properties ◽

Three Point Bending

Purpose This study aims to predict the fracture properties of geopolymer concrete, which is necessary for studying failure behaviour of concrete. Design/methodology/approach Geopolymers are new alternative binders for cement in which polymerization gives strength to concrete rather than through hydration. Geopolymer concrete was developed from industrial byproducts such as GGBS and dolomite. Present study estimates the fracture energy of GGBS geopolymer concrete using three point bending test (RILEM TC50-FMC) with different percentages of dolomite and compare with cement concrete having same strength. Findings The fracture properties such as peak load, critical stress intensity factor, fracture energy and characteristic length are found to be higher for GGBS-dolomite geopolymer concrete, when their proportion becomes 70:30. Originality/value To the best of the authors’ knowledge, this is an original experimental work.

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Comparison of Fracture Energy Values Obtained from 3PB, WST and CT Test Configurations

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.969.89 ◽

2014 ◽

Vol 969 ◽

pp. 89-92 ◽

Cited By ~ 1

Author(s):

Táňa Holušová ◽

Stanislav Seitl ◽

Alfonso Fernández Canteli

Keyword(s):

Fracture Energy ◽

Fatigue Loading ◽

Compact Tension ◽

Bending Test ◽

Three Point Bending ◽

Concrete Failure ◽

Wedge Splitting Test ◽

Splitting Test ◽

Fracture Tests ◽

Alternative Testing

Modeling of concrete failure under fatigue loading is becoming a field of interest. Possible alternative testing solutions are now being searched. In this paper, the fracture energy for a certain concrete, resulting from three traditional fracture tests, namely three point bending test, wedge-splitting test and modified compact tension test, is investigated.

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Application of fracture energy for the assessment of frost degradation of high-strength concretes

Budownictwo i Architektura ◽

10.35784/bud-arch.2453 ◽

2021 ◽

Vol 20 (2) ◽

pp. 057-068

Author(s):

Sylwia Borowska ◽

Marta Kosior-Kazberuk

Keyword(s):

Fracture Energy ◽

High Strength ◽

Bending Test ◽

Structural Defects ◽

Crack Tip Opening Displacement ◽

Opening Displacement ◽

Critical Crack ◽

Three Point Bending ◽

Freeze Thaw ◽

Crack Tip Opening

Knowledge of fracture mechanics parameters can help for a more accurate assessment of frost degradation of high-strength concrete. High strength concretes, despite the tight structure, are characterized by increased brittleness. Cracks in the concrete structure are places of accumulation of significant stresses. Additional stresses resulting from cyclic freeze/thaw stimulate the material destruction processes. The basic strength parameters of concrete do not take into account structural defects of the material and do not give a complete description of susceptibility to damage caused by, e.g., frost degradation. This study aimed to determine the relationship between frost degradation of high-strength concretes and changes in the value of their fracture energy associated with the initiation of cracking after 150, 250, 350 and 450 freeze/thaw cycles. The research was carried out using 100 × 100 × 400 mm samples, with a pre-initiated 30 mm deep notch. The I load model under a three-point bending test was used, based on the procedure recommended by RILEM. Concrete with a compressive strength of 90 MPa with steel fibres and a mixture of steel and basalt fibers was tested. The obtained results allow for the evaluation of frost degradation using fracture energy GF and critical crack tip opening displacement CTODc.

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Comparison of the result of notched three point bending test with Model Code 2010 formulas

Concrete Structures ◽

10.32970/cs.2021.1.2 ◽

2021 ◽

Vol 22 ◽

pp. 5-12

Author(s):

Viktor Hlavicka

Keyword(s):

Compressive Strength ◽

Fracture Energy ◽

Bending Test ◽

Mechanical Parameters ◽

Calculation Methods ◽

Three Point Bending ◽

Model Code ◽

Flexural Tensile Strength ◽

Different Types ◽

Model Code 2010

The primary application of the notched three point bending test (3PBT) is to determine the fracture energy of concrete. However, the measurement setup is also suitable for determining additional mechanical parameters: flexural tensile strength, modulus of elasticity, and indirectly the compressive strength also. The aim of this paper is to present the calculation methods of the mechanical properties that can be determined from the results of a test series in which mixtures with different types of aggregates were used (quartz, dolomite, limestone, andesite, expanded clay). To validate the obtained results, the parameters determined from the measurements are compared to the formulas of the fib Model Code 2010. A recommendation is also presented for the calculation of the fracture energy by using compressive strength values measured on a half prism.

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Effect of Palm Oil Fiber (POF) to Strength Properties and Fracture Energy of Green Concrete

The Journal of The Institution of Engineers, Malaysia ◽

10.54552/v79i1.6 ◽

2018 ◽

Vol 79 (1) ◽

Author(s):

Abdul Aziz Abdul Samad ◽

Cindy Wong Yean Theng ◽

Tim Ee Ching ◽

Noridah Mohamad ◽

Muhammad Afiq Tambichik ◽

...

Keyword(s):

Fracture Energy ◽

Palm Oil ◽

Strength Properties ◽

Strength Test ◽

Recycled Concrete ◽

Bending Test ◽

Concrete Aggregate ◽

Palm Oil Fuel Ash ◽

Green Concrete ◽

Three Point Bending

The lack of research on concrete which utilizes Palm Oil Fuel Ash (POFA), Rice Husk Ash (RHA), Recycled Concrete Aggregate (RCA) and Palm Oil Fiber (POF) simultaneously in concrete was globally observed. To meet this gap, a study on green concrete consisting of POFA, RHA and RCA with added untreated POF as binders was conducted. The study focusses on the effect of varying percentages of untreated POF, ranging from 0%, 0.25%, 0.50% and 0.75%, to the strength properties and fracture energy of green concrete. The strength properties of green concrete were investigated by conducting the compression strength test and tensile strength test on forty-eight (48) cubes and cylinders at the curing age of 7 and 28 days. The tests show that the strength of green concrete decreases, as the percentage of POF increases. This was preceded by the establishment of an optimum percentage of POF at 0.25%. The fracture energy of the green concrete was determined by testing twelve numbers of notched beams with dimensions of 100mm x 100mm x 500mm under the three-point bending test. From the three-point bending test, the load-deflection profile for each specimen with different percentages of untreated POF was obtained. Three existing theoretical models, namely Hillerborg, Bazant and CEB models were used to measure the fracture energy of the green concrete with varying percentage of fiber. Results range from 37.94 N/m to 153.81 N/m was observed. The study also successfully established the reliability of Hillerborg’s model to fracture energy when models by Bazant and CEB surprisingly shows a decrease in fracture energy measurements with increase in fiber content.

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Effect of Span-to-Depth Ratio on the Fracture Energy of Foam Concrete

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.730.440 ◽

2017 ◽

Vol 730 ◽

pp. 440-444 ◽

Cited By ~ 1

Author(s):

Norashidah Abd Rahman ◽

Zainorizuan Mohd Jaini ◽

Rahmat Hidayat Muhammed Rum ◽

Siti Amirah Azra Khairuddin ◽

Mohd Naqiuddin Zamri

Keyword(s):

Fracture Energy ◽

Construction Industry ◽

Bending Test ◽

Low Density ◽

Density Range ◽

Foam Concrete ◽

Test Beam ◽

Three Point Bending ◽

Alternative Material ◽

High Serviceability

The use of foam concrete as an alternative material in the construction industry has become popular in structure industries due to the low density range, good strength, high serviceability, and lightness of this material. Several studies have been conducted to determine the mechanical properties and strength of foam concrete. However, research on fracture energy is still ongoing. Therefore, these studies aim to experimentally investigate the effect of span-to-depth (S/W) ratio on the fracture energy of foam concrete using beam specimens with V-notches through a three-point bending test. Beam specimens were encased and prepared at a density of 1600 kg/m3. Moreover, three different S/W ratios (4, 5, and 6) with a notch height of 20 mm were adopted. Fracture energy was determined using the Hillerborg, Bazant, and Comite Euro-International du Beton models. From the experiment, results showed that S/W ratio affected fracture energy.

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Influence of the Amount of Steel Fibers on Fracture Energy and Drying Shrinkage of HPFRCC

Advances in Materials Science and Engineering ◽

10.1155/2020/8459145 ◽

2020 ◽

Vol 2020 ◽

pp. 1-15

Author(s):

Weina Guo ◽

Peng Zhang ◽

Yupeng Tian ◽

Bing Wang ◽

Wan Ma

Keyword(s):

Fracture Energy ◽

Steel Fiber ◽

Drying Shrinkage ◽

Fiber Content ◽

Steel Fibers ◽

Bending Test ◽

Uniaxial Tensile ◽

Three Point Bending ◽

Mix Proportion ◽

Splitting Test

The fracture energy of the high-performance fiber-reinforced cement-based composite (HPFRCC) can be modified within wide limits by the variation of the amount of steel fibers added to the fresh mix. First of all, considering the actual engineering conditions in Qingdao, the materials commonly used in Qingdao were selected. The optimal reference mix proportion of the HPFRCC cementing material was proposed through determination of fluidity and flexural strength. Based on the optimal mix proportion, the uniaxial tensile, fracture, and dry shrinkage properties of HPFRCC with different steel fibers are systematically studied. Stress-strain diagrams of the different samples were measured under the uniaxial tensile test, wedge splitting test, and three-point bending test. The steel fiber content was varied between 0 and 200 kg/m3. The load bearing capacity and the fracture energy were determined experimentally. In addition, moisture loss as a function of time and shrinkage was determined in an environment of 20°C and 50% RH (relative humidity). The results indicate that the maximum load increases significantly in the HPFRCC series reinforced by 150 and 200 kg/m3 of steel fibers. Both have a hardening branch developed after the first crack deflection due to the high percentage of fibers bridging the crack surfaces. The load bearing capacity and fracture energy increased almost linearly with the steel fiber content. It was found that the three-point bending test is more applicable in measuring the fracture energy of HPFRCC than the wedge splitting test. The addition of steel fibers decreased the moisture diffusion and consequently the drying shrinkage of HPFRCC, and there was minimum weight loss and deformation when the steel fiber content was 150 kg/m3. The results obtained will be presented and discussed.

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