Strength Modeling of High-Strength Concrete with Hybrid Fibre Reinforcement

Ravichandran, A.; Suguna, K.; Ragunath, P. N.

doi:10.3844/ajassp.2009.219.223

Cited by 18 publications

(14 citation statements)

References 11 publications

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“…Thus, material strain rate effects become critical and must be accounted for in predicting columns performance for short duration loadings such as impact and blast loadings. Many experimental research results were reported in the area of compressive and tensile strength of concrete at different strain rates (Abu-Lebdeh et al, 2010;Ravichandran et al, 2009;Kotsovos, 1983). A selection of the commonly published results is also reported by Saravanan et al, 2010;Bischoff and Perry, 1991;and Malvar and Crawford (1998) as presented in Fig.…”

Section: Introductionmentioning

confidence: 90%

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High Rate-Dependent Interaction Diagrams for Reinforced Concrete Columns

Abu-Lebdeh¹

2011

American Journal of Engineering and Applied Sciences

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Problem statement:There is a need to better understand the rate dependence behavior of reinforced concrete structures in order to improve their response to impact and blast loads. Analysis and design of reinforced concrete structures subjected to seismic loadings has been recommended in many FEMA guidelines. However, reevaluation of design becomes extremely important in cases where large deformations are expected such as blast and impact resistant. Approach: This study presents a numerical model to evaluate reinforced concrete columns submitted to high strain rates expected for seismic, impact and blast loadings. The model utilizes dynamic stress-strain response and considers the effect of strain rate on concrete strength; strain at peak stress; yield and ultimate strength of steel; and slope of the softening portion of the stress-strain curve. Results: Results are presented in the form of interaction diagrams and compared with the available analytical and experimental results. Comparison with available data shows that the proposed model can give consistent prediction of the dynamic behavior of reinforced concrete columns. Conclusion/Recommendations: The established interaction diagrams may be used to design columns to withstand high velocity impact loads. Also, knowledge gained can be used to improve dynamic behavioral models and computer-aided analysis and design of reinforced concrete columns subjected to severe blast loadings.

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Section: Introductionmentioning

confidence: 90%

“…6) is given as a function of the dynamic slope, Z d . This softening slope is determined based on the available experimental results (Grote et al, 2001;Ravichandran et al, 2009) and proposed as:…”

Section: Methodsmentioning

confidence: 99%

High Rate-Dependent Interaction Diagrams for Reinforced Concrete Columns

Abu-Lebdeh¹

2011

American Journal of Engineering and Applied Sciences

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“…It contributes both pozzolonic and filler effect to the concrete, but more dominantly in filling effects due to its extremely fine particle size. As a result, it drastically increases the water demand of the mixture but it can be overcome by incorporating high range water reducing admixture like superplasticiser (Caldarone, 2009;Neville, 1995;Khatri and Sirivivatnanon, 1995;Ravichandran et al, 2009;Roshan et al, 2010) The finely divided particles reacts aggressively with calcium hydroxide when added to the fresh concrete and forms calcium silicate hydrate, which enhance the resistivity of concrete towards chemical attacks and compressive strength (Caldarone, 2009). The filler effect is resulted by the extremely fine (<1 micrometer) particles.…”

Section: Introductionmentioning

confidence: 99%

Rational Mix Design Approach for High Strength Concrete Using Sand with very High Fineness Modulus

Hoe¹

2010

American Journal of Applied Sciences

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Problem statement: Production of concrete is always deal with inconsistency. Sources of variation like materials from different geographical basis, mix design method, fineness of aggregates and so on will attribute to different level of achievement of the concrete. Even though researcher had verified that higher fineness modulus of sand would yield better performance for the concrete, but so far there have been scarce amount of paper reported on the mix design method adopting high fineness modulus of sand. Approach: This study discussed the revolution of design mix proportion towards achieving high strength with considerably cement content using local availably constituent materials. A total of 15 mixes was casted till to the high strength at more than 65 MPa was achieved. The compressive strength and workability of each mixes were presented. The method of mixture proportioning was begun with British Department Of Environment (DOE) method. Then, rational design method of achieving high strength concrete was developed. Results: At the end of experimental program, it was found that DOE method was not suitable to apply in designing high strength concrete. 12% was the optimum level of replacement of the total binder content by silica fume. Further increase of total binder content without adjustment to the amount of aggregate content has decreased the strength achievement of the concrete. Very coarse fine aggregate with fineness modulus 3.98 increased the compressive strength of the concrete in large extent. The increased of superplasticiser from 2.0% to 2.5% has decreased the compressive strength of the concrete. Conclusion: The rational mix design approach was developed. A Grade 70 concrete can be produced with moderate level of cement content by this approach.

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“…Hybrid fibre or hybridization process of fibres in cementitious composites is achieved by combining different types of fibres, in structural and mechanical properties [5]. Mixtures of hybrid fibre with 1.5% to 2% volume fraction (V f ) with high volume fly ash shows high performance fibre reinforced cementitious composite (HPFRCC) behaviour.…”

Section: Introductionmentioning

confidence: 99%

Influence of Mixture, Wire Mesh and Thickness on the Flexural Performance of Hybrid PVA Fibre Ferrocement Panels

Abushawashi¹,

Vimonsatit²

2014

IJIRSET

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This paper presents the results of an experimental investigation into the flexural performance of hybrid polyvinyl alcohol (PVA) fibre ferrocement (HFF) composites panels. The primary focus is on the influence of mixture matrix and wire mesh content in the panels which have different thicknesses. The effect of using fly ash and silica fume in the mixtures is investigated from the testing of 21 panels. Best performed mixes are then chosen to prepare additional 27 ferrocement panelswith varying thicknesses and wire mesh layers. The observation of deflection hardening, energy absorption, and flexural stress is significant in this experiment. The energy absorption at post cracking and the toughness indexes are calculated from the flexure test results, and are used for the evaluation of strength capacity of this type of cementitious composites.

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Strength Modeling of High-Strength Concrete with Hybrid Fibre Reinforcement

Cited by 18 publications

References 11 publications

High Rate-Dependent Interaction Diagrams for Reinforced Concrete Columns

High Rate-Dependent Interaction Diagrams for Reinforced Concrete Columns

Rational Mix Design Approach for High Strength Concrete Using Sand with very High Fineness Modulus

Influence of Mixture, Wire Mesh and Thickness on the Flexural Performance of Hybrid PVA Fibre Ferrocement Panels

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