scholarly journals Composite Strain Hardening Properties of High Performance Hybrid Fibre Reinforced Concrete

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Vikram Jothi Jayakumar ◽  
Sivakumar Anandan
Keyword(s):  
Strain Hardening ◽  
Residual Strength ◽  
High Performance ◽  
Steel Fibre ◽  
Volume Fraction ◽  
Strength Properties ◽  
Polypropylene Fibres ◽  
Hybrid Fibre ◽  
Strength Capacity ◽  
Cementitious System

Hybrid fibres addition in concrete proved to be a promising method to improve the composite mechanical properties of the cementitious system. Fibre combinations involving different fibre lengths and moduli were added in high strength slag based concrete to evaluate the strain hardening properties. Influence of hybrid fibres consisting of steel and polypropylene fibres added in slag based cementitious system (50% CRL) was explored. Effects of hybrid fibre addition at optimum volume fraction of 2% of steel fibres and 0.5% of PP fibres (long and short steel fibre combinations) were observed in improving the postcrack strength properties of concrete. Test results also indicated that the hybrid steel fibre additions in slag based concrete consisting of short steel and polypropylene (PP) fibres exhibited a the highest compressive strength of 48.56 MPa. Comparative analysis on the performance of monofibre concrete consisting of steel and PP fibres had shown lower residual strength compared to hybrid fibre combinations. Hybrid fibres consisting of long steel-PP fibres potentially improved the absolute and residual toughness properties of concrete composite up to a maximum of 94.38% compared to monofibre concrete. In addition, the relative performance levels of different hybrid fibres in improving the matrix strain hardening, postcrack toughness, and residual strength capacity of slag based concretes were evaluated systematically.

Synthetic Fibres for Fibre Concrete Composites

1993 ◽  
Vol 305 ◽  
Author(s):  
Dorel Feldman ◽  
Zhihong Zheng
Keyword(s):  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Dynamic Strength ◽  
Strength Properties ◽  
Fibre Volume ◽  
Fibre Reinforcement ◽  
Polypropylene Fibres ◽  
Fibre Concrete ◽  
Deformation Properties ◽  
General Aspects

AbstractThe use of fibrous reinforcement to improve the strength and deformation properties of concrete is now well established. The concept of fibre reinforcement is to use the deformation of the matrix under stress to transfer load to the fibre. Substantial improvements in static and dynamic strength properties could then be achieved if the fibres are strong and stiff, and loaded to fracture, provided there is, of course, a minimum fibre-volume fraction.Besides fibres like asbestos, glass and steel, different kind of synthetic fibres such as polyethylene, polypropylene, polyamide and others are recently used for cementitious composites.Together with general aspects of synthetic fibre concrete composites, original results concerning the study done on a hybrid composite based on steel and polypropylene fibres will be presented and discussed.

scholarly journals Flexural Toughness Properties of Reinforced Steel Fibre Incorporated Alkali Activated Slag Concrete

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Srinivasan Karunanithi ◽  
Sivakumar Anandan
Keyword(s):  
Steel Fibre ◽  
Volume Fraction ◽  
Comprehensive Evaluation ◽  
High Strength ◽  
Strength Properties ◽  
Geopolymer Concrete ◽  
Steam Curing ◽  
Accelerated Curing ◽  
Point Bend ◽  
Activated Slag

The influence of steel fibre addition on the flexural properties of geopolymer based cementitious matrix was investigated in the present study. Slag based geopolymer mixtures were prepared with different binder and aggregate combinations. Strength gain and hardened properties of different geopolymer concrete mixtures were evaluated using accelerated curing techniques subjected to hot air oven and steam curing. Further, the steel fibre additions on the mechanical strength properties of a high strength geopolymer mixture were studied. A comprehensive evaluation on the post-crack toughness properties was assessed using four-point bend test. Test results exhibited that a geopolymer concrete of maximum compressive strength of 56.6 MPa can be achieved with steam curing. Experimental observations also demonstrated that the steel fibre inclusions in geopolymer concrete provided adequate improvement on post-crack toughness properties and showed higher composite performance with increased volume fraction of steel fibres.

scholarly journals Effect of Polypropylene Fiber on the Flexural Strength Properties of Lightweight Foam Mixed Soil

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Raksiri Sukkarak ◽  
Pornkasem Jongpradist ◽  
Pitthaya Jamsawang ◽  
Piti Sukontasukkul ◽  
Prinya Chindaprasirt
Keyword(s):  
Flexural Strength ◽  
Strain Hardening ◽  
Residual Strength ◽  
Cement Content ◽  
Polypropylene Fiber ◽  
Strength Properties ◽  
Flexural Properties ◽  
Strength Ratio ◽  
Flexural Performance ◽  
Lightweight Foam

This study examines the effect of polypropylene fiber on the flexural strength properties of lightweight foam mixed soil (LFS). The flexural properties of LFS comprising different proportions of polypropylene fiber (58 mm) at different volume fractions (0.5%, 0.75%, and 1%), three different cement contents of 100, 150, and 200 kg/m3, and densities of 0.8, 1.0, and 1.2 g/cm3 were thoroughly investigated. The flexural performance of LFS according to ASTM C1609 was achieved after 28 days of aging. The results show that the flexural characteristics of LFS could be enhanced by fiber additives, as indicated by the increase in the flexural/residual strength and equivalent flexural strength ratio. The flexural performance is also related to the mixing components, including the density and cement content. For the toughness behavior, the equivalent flexural strength ratio reached up to 100%, which could be achieved with the strain-hardening specimens. The fiber inclusion is more efficient with an increase in the density and cement content of specimens as shown by the overall rating of the flexural performance.

Effect of Fiber Type and Fiber Hybrids on Strain-Hardening and Multiple Cracking Properties of the Ultra-High Performance Cementitious Composites under Uniaxial Loads

2016 ◽  
Vol 711 ◽  
pp. 187-194 ◽  
Author(s):  
Li Ping Guo ◽  
Dong Yi Lei
Keyword(s):  
Tensile Strength ◽  
Strain Hardening ◽  
High Performance ◽  
Steel Fiber ◽  
Volume Fraction ◽  
Uniaxial Tensile ◽  
Cementitious Composites ◽  
Multiple Cracking ◽  
Polyethylene Fiber ◽  
Pva Fiber

Five series of strain hardening ultra-high performance cementitious composites (SHUHPCC) incorporated with different types of fibers and hybrid fibers were produced. Three types of fibers (steel fiber, polyvinyl alcohol fiber and polyethylene fiber) were used as mono or hybrid reinforcement in SHUHPCC with the same volume fraction of 2%. The primary strengths, strain hardening and multiple cracking behaviors of hybrid fiber reinforced SHUHPCC under the uniaxial tensile are investigated. Test results show that the SHUHPCC containing PE fibers exhibited higher strain hardening capacity and lower first cracking strength than composites reinforced with mono PVA fiber or mono steel fiber. The composites containing PVA fibers or steel fibers have higher tensile strength and first cracking strength than the composite reinforced by mono PE fiber. Hybridization reinforcement with different fibers is able to make up defects of mono fiber reinforcement for SHUHPCC. The change laws of tensile strength and uniaxial compression strength of SHUHPCC with mono PE fiber and mono PVA fiber are opposite to each other.

USE OF FERROCEMENT PANEL AS REINFORCED CONCRETE SLABS WITH LIGHTWEIGHT BLOCKS INFILL

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Nadim Abushawashi ◽  
Vanissorn Vimonsatit
Keyword(s):  
Reinforced Concrete ◽  
Strain Hardening ◽  
High Performance ◽  
Wire Mesh ◽  
Concrete Slabs ◽  
Control Group ◽  
Reinforced Concrete Slabs ◽  
Strength Capacity ◽  
Pva Fiber ◽  
Permanent Form

This paper is part of an experimental series to investigate the potential use of ferrocement panels as a permanent form of reinforced concrete slabs with lightweight blocks infill. The ferrocement panels used are engineered with polyvinyl alcohol (PVA) fiber to have a strain hardening which can be characterized as high-performance fiber-reinforced cementitious composite (HPFRCC), called Engineered Ferrocement (EF). In the experimental work, ferrocement control panels and hybrid ferrocement panels were tested for strength capacity and hard strain behavior through flexure, toughness, and multitrack forming. The results showed that by using the ideal fiber/wire mesh content, the hybrid ferrocement panels act as a strain-hardening cementitious material, and successfully increasing the flexure strength compared to the control-group ferrocement. The initial investigation indicates that hybrid PVA fiber ferrocement in tensile zones can be successfully used as permanent form.

Macroprobe Mode for the Study of Segregation in Steels

1990 ◽  
Vol 48 (2) ◽  
pp. 260-261
Author(s):  
Auclair Gilles ◽  
Benoit Danièle
Keyword(s):  
Mechanical Properties ◽  
Spatial Distribution ◽  
High Performance ◽  
Volume Fraction ◽  
Sheet Steel ◽  
Acquisition Time ◽  
Chemical Information ◽  
X Ray ◽  
Accurate Quantitative Analysis ◽  
Optical Micrographs

During these last 10 years, high performance correction procedures have been developed for classical EPMA, and it is nowadays possible to obtain accurate quantitative analysis even for soft X-ray radiations. It is also possible to perform EPMA by adapting this accurate quantitative procedures to unusual applications such as the measurement of the segregation on wide areas in as-cast and sheet steel products.The main objection for analysis of segregation in steel by means of a line-scan mode is that it requires a very heavy sampling plan to make sure that the most significant points are analyzed. Moreover only local chemical information is obtained whereas mechanical properties are also dependant on the volume fraction and the spatial distribution of highly segregated zones. For these reasons we have chosen to systematically acquire X-ray calibrated mappings which give pictures similar to optical micrographs. Although mapping requires lengthy acquisition time there is a corresponding increase in the information given by image anlysis.

Co-cooking nonwoods with hardwoods

TAPPI Journal ◽  
2014 ◽  
Vol 13 (6) ◽  
pp. 19-24
Author(s):  
TROY RUNGE ◽  
CHUNHUI ZHANG
Keyword(s):  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Strength Properties ◽  
Agricultural Residues ◽  
Kraft Pulping ◽  
Pulp And Paper ◽  
Strength Increase ◽  
Xylan Content

Agricultural residues and energy crops are promising resources that can be utilized in the pulp and paper industry. This study examines the potential of co-cooking nonwood materials with hardwoods as means to incorporate nonwood material into a paper furnish. Specifically, miscanthus, switchgrass, and corn stover were substituted for poplar hardwood chips in the amounts of 10 wt %, 20 wt %, and 30 wt %, and the blends were subjected to kraft pulping experiments. The pulps were then bleached with an OD(EP)D sequence and then refined and formed into handsheets to characterize their physical properties. Surprisingly, all three co-cooked pulps showed improved strength properties (up to 35%). Sugar measurement of the pulps by high-performance liquid chromatography suggested that the strength increase correlated with enriched xylan content.

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