Computational evaluation of flexural toughness of FRC and fracture properties of plain concrete

Using PCER (post-crack energy ratio) method and plain concrete specimen as reference, the flexural toughness enhancing ability of propylene spinning fiber, propylene monofilament fiber and end-deformed steel fiber was studied. Experiment results show that under the common engineering dosage, the flexural toughness enhancing ability of end-deformed steel fiber is far more outstanding than propylene fibers, and comparing with each other, the flexural toughness enhancing ability of propylene spinning fiber is better than propylene monofilament fiber. As far as one type of fiber is concerned, under the same dosage, along with the enhancement of concrete strength grade, the flexural toughness enhancing ability tends to decrease. Meanwhile, along with enhancement of curing age, the flexural toughness enhancing ability tends to decrease also.

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Strength Development of High-Strength Ductile Concrete Incorporating Metakaolin and PVA Fibers

The Scientific World JOURNAL ◽

10.1155/2014/387259 ◽

2014 ◽

Vol 2014 ◽

pp. 1-11 ◽

Cited By ~ 9

Author(s):

Muhammad Fadhil Nuruddin ◽

Sadaqat Ullah Khan ◽

Nasir Shafiq ◽

Tehmina Ayub

Keyword(s):

Mechanical Properties ◽

Aspect Ratio ◽

Volume Fraction ◽

High Strength ◽

Plain Concrete ◽

Strength Development ◽

Flexural Toughness ◽

Toughness Index ◽

Refined Microstructure

The mechanical properties of high-strength ductile concrete (HSDC) have been investigated using Metakaolin (MK) as the cement replacing material and PVA fibers. Total twenty-seven (27) mixes of concrete have been examined with varying content of MK and PVA fibers. It has been found that the coarser type PVA fibers provide strengths competitive to control or higher than control. Concrete with coarser type PVA fibers has also refined microstructure, but the microstructure has been undergone with the increase in aspect ratio of fibers. The microstructure of concrete with MK has also more refined and packing of material is much better with MK. PVA fibers not only give higher stiffness but also showed the deflection hardening response. Toughness Index of HSDC reflects the improvement in flexural toughness over the plain concrete and the maximum toughness indices have been observed with 10% MK and 2% volume fraction of PVA fibers.

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Flexural Toughness of Concrete with High Performance Polymers

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.687.480 ◽

2013 ◽

Vol 687 ◽

pp. 480-484

Author(s):

Chee Seong Chin ◽

Robert Yong Xiao

Keyword(s):

High Performance ◽

Plain Concrete ◽

Cost Effective ◽

Absorption Capacity ◽

Sustainable Construction ◽

Peak Performance ◽

Steel Fibres ◽

Flexural Toughness ◽

High Performance Polymer ◽

Potential Alternative

Flexural toughness is a measure of energy absorption capacity and characterization of material’s ability to resist fracture under flexure loads. Concrete, when unreinforced, behaves generally well in compression but its flexural behaviour particularly the post-peak performance is rather weak and brittle. Conventional method has been to include steel fibres to enhance the flexural capacity but was discouraged by their impractically heavy cost and weight constraints. This paper presents the use of high performance polymeric fibres as a cost-effective and lightweight potential alternative which also fits well into the modern era of sustainable construction seeing that they leaves substantially lower carbon footprint compared to steel. Mechanically deformed high performance polymer (HPP) made of 100 percent virgin polypropylene was adopted and incorporated into concrete mixes and its composite performance was experimentally investigated and compared to plain concrete and those reinforced by steel fibres. An analytical method to predict the overall flexural toughness response has also been proposed and verified.

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Evaluating Plain Concrete Flexural Toughness Using PCER Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.287-290.1184 ◽

2011 ◽

Vol 287-290 ◽

pp. 1184-1188

Author(s):

Jian Guo Han ◽

Pei Yu Yan ◽

Gang Ling Li

Keyword(s):

Plain Concrete ◽

Energy Ratio ◽

Ratio Method ◽

K Value ◽

Flexural Toughness ◽

Strength Grade ◽

Curing Age ◽

Changing Tendency

Using PCER (post-crack energy ratio) method, the influence of strength grade and curing age on flexural toughness of plain concrete were analyzed. Results show that along with the increase of strength grade and curing age, the flexural toughness of plain concrete decrease; and along with the increase of the K value used in the calculating equation, the flexural toughness of plain concrete decrease too. Meanwhile, the changing tendency of PCER value along with the K value manifests that when evaluating the flexural toughness of different quality concrete, the same K value should be used.

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Experimental Study on Flexural Toughness Characteristic of Polyvinyl Alcohol (PVA) Fiber Reinforced Concrete

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.744-746.1422 ◽

2015 ◽

Vol 744-746 ◽

pp. 1422-1426

Author(s):

Jun Su ◽

Jian Ping Liu ◽

Ming Chen

Keyword(s):

Reinforced Concrete ◽

Polyvinyl Alcohol ◽

Volume Ratio ◽

Plain Concrete ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Fiber Volume ◽

Flexural Toughness ◽

Toughness Index ◽

Pva Fiber

In order to study the flexural toughness of PVA fiber reinforced concrete, employ the volume mixing ratio is 0.2%, 0.1%, 0.08%, polyvinyl alcohol (PVA) will be mixed with ordinary C40 concrete to form PVA fibers reinforced concrete. Its flexural toughness properties were tested and the load-deflection curve of all beams is obtained. Based on the ASTM method, the flexural toughness of PVA fiber reinforced concrete is analyzed. The experimental results indicate that the PVA fiber can improve the flexural toughness and the deformation ability of concrete beams remarkably. When the fiber volume ratio is 0.1%, the flexural toughness index I5 and I10 of concrete with PVA fiber are 3.73 and 6.23 times higher than that of the plain concrete respectively. The failure mode of PVA fiber concrete is changed from brittle to ductile fracture.

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Computational evaluation of Isoorientin (C-glycosyl flavone) on PPAR-gamma receptors and HMG- CoA reductase using MOE 2008.10

Planta Medica ◽

10.1055/s-0029-1234744 ◽

2009 ◽

Vol 75 (09) ◽

Author(s):

O Fidan ◽

M Aslan ◽

M Mor

Keyword(s):

Ppar Gamma ◽

Hmg Coa Reductase ◽

Computational Evaluation ◽

Coa Reductase

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Structural performance of steel fibre reinforced concrete — Part IV. Toughness properties

International Review of Applied Sciences and Engineering ◽

10.1556/irase.5.2014.2.3 ◽

2014 ◽

Vol 5 (2) ◽

pp. 119-125

Author(s):

I. Kovács

Keyword(s):

Reinforced Concrete ◽

Steel Fibre ◽

Fibre Orientation ◽

Reinforced Concrete Beams ◽

Fibre Reinforcement ◽

Fibre Reinforced Concrete ◽

Flexural Toughness ◽

Steel Fibre Reinforced Concrete ◽

Set Up ◽

Flexural Tests

The present paper of a series deals with the experimental characterisation of flexural toughness properties of structural concrete containing different volume of hooked-end steel fibre reinforcement (75 kg/m3, 150 kg/m3). Third-point flexural tests were carried out on steel fibre reinforced concrete beams having a cross-section of 80 mm × 85 mm with the span of 765 mm, hence the shear span to depth ratio was 3. Beams were sawn out of steel fibre reinforced slab elements (see Part I) in order to take into consideration the introduced privilege fibre orientation (I and II) and the position of the beam (Ba-a, Ba-b, Ba-c) before sawing (see Part I). Flexural toughness properties were determined considering different standard specifications, namely the method of the ASTM (American Standards for Testing Materials), the process of the JSCE (Japan Society of Civil Engineering), and the final proposal of Banthia and Trottier for the post cracking strength. Consequently, behaviour of steel fibre reinforced concrete was examined in bending taking into consideration different experimental parameters such as fibre content, concrete mix proportions, fibre orientation, positions of test specimens in the formwork, while experimental constants were the size of specimens, the type of fibre used and the test set-up and test arrangement.

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Micromechanics Measurements Applied to Integrated Circuit Microelectronics

MRS Proceedings ◽

10.1557/proc-473-27 ◽

1997 ◽

Vol 473 ◽

Cited By ~ 2

Author(s):

David R. Clarke

Keyword(s):

Integrated Circuits ◽

Integrated Circuit ◽

Fracture Resistance ◽

Interface Fracture ◽

New Techniques ◽

Fracture Properties ◽

Engineered Structures ◽

Mechanical And Fracture Properties ◽

Interconnect Lines ◽

Metallic Interconnect

ABSTRACTAs in other engineered structures, fracture occasionally occurs in integrated microelectronic circuits. Fracture can take a number of forms including voiding of metallic interconnect lines, decohesion of interfaces, and stress-induced microcracking of thin films. The characteristic feature that distinguishes such fracture phenomena from similar behaviors in other engineered structures is the length scales involved, typically micron and sub-micron. This length scale necessitates new techniques for measuring mechanical and fracture properties. In this work, we describe non-contact optical techniques for probing strains and a microscopic “decohesion” test for measuring interface fracture resistance in integrated circuits.

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