Accelerated engineering properties of high and low volume fly ash concretes reinforced with glued steel fibers

doi:10.1007/s11709-013-0226-6

Front Struc Civil Eng

2013, Vol. 7

Issue (4) : 429-445 https://doi.org/10.1007/s11709-013-0226-6

RESEARCH ARTICLE

Accelerated engineering properties of high and low volume fly ash concretes reinforced with glued steel fibers

Vallarasu Manoharan SOUNTHARARAJAN, Dr. Anandan SIVAKUMAR(

)

Structural Engineering Division, School of Mechanical and Building Sciences, VIT University, Vellore 632014, India

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Abstract

The present study focuses on the improvement of pozzolanic reaction of fly ash particles with the cement hydration products. Low and high volume fly ash concrete mixtures were studied systematically with the addition of accelerating admixtures and accelerated curing of the concrete specimens in a steam chamber for 18 h at 75°C. Also, the reinforcing effects of glued steel fibers addition on the compressive and flexural performance of fly ash concrete were investigated. The test results indicated that the addition of accelerator improved the rate of hardening and the inclusion of steel fibers provided higher flexural performance. Also, it can be noted that the high volume fly ash (50%) addition in concrete showed a reduction in strength; however, the addition of accelerator has compensated the deceleration in strength gain. The proper selection of concrete ingredients, addition of accelerator and initial steam curing for 18 h showed better improvement on the engineering properties in fly ash concrete. A maximum increase (41.7%) in compressive strength of fly ash concrete around 52.90 MPa was noticed for 25% fly ash substitution and 1.5% steel fibers addition. Dynamic elastic modulus was also calculated in loaded concrete specimen using ultrasonic pulse velocity test and showed a good agreement with the experimental value.

Keywords fly ash pozzolanic index steam curing superplasticizer accelerator steel fibres elastic modulus

Corresponding Authors: SIVAKUMAR Dr. Anandan,Email:sivakumara@vit.ac.in

Issue Date: 05 December 2013

Cite this article:

Vallarasu Manoharan SOUNTHARARAJAN,Dr. Anandan SIVAKUMAR. Accelerated engineering properties of high and low volume fly ash concretes reinforced with glued steel fibers[J]. Front Struc Civil Eng, 2013, 7(4): 429-445.

URL:

http://journal.hep.com.cn/fsce/EN/10.1007/s11709-013-0226-6
http://journal.hep.com.cn/fsce/EN/Y2013/V7/I4/429

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Tab.1 Chemical composition of cementitious materials used in the study

Tab.2 Properties of glued steel fibers (GSF) used in the study

Fig.1 Snap shot of glued steel fibers (GSF) used in the study

Tab.3 Various concrete mixture proportions used in the study

Fig.2 Steam curing chamber for concrete specimens used in the study

Fig.3 Test set up for flexural testing machine

Fig.4 Loading procedure to obtain residual load

Fig.5 Snapshot of ultrasonic pulse velocity test set up

Fig.6 Test set up for determination of Young’s modulus of concrete

Fig.7 Test setup for measurement of ultrasonic pulse velocity in loaded concrete specimen

Tab.4 Pozzolanic activity index for various fly ash cement mortar proportions (1:3)

Fig.8 (a) Slump test results for various concrete mixes at / ratio 0.6 with 25% of fly ash; (b) slump test results for various concrete mixes at / ratio 0.8 with 25% of fly ash; (c) slump test results for various concrete mixes at / ratio 0.6 with 50% of fly ash; (d) slump test results for various concrete mixes at / ratio 0.8 with 50% of fly ash

Tab.5 Compressive strength results for various concrete mixes

Fig.9 (a) Compressive strength of various concretes without steel fibers and accelerator; (b) compressive strength of various concretes containing 1% accelerator; (c) compressive strength of various concretes containing 25% of fly ash and different percentage of steel fibers; (d) compressive strength of various concretes containing 50% of fly ash and different percentage of steel fibers

Fig.10 (a) Split tensile strength of various concretes containing 25% and 50% of fly ash; (b) split tensile strength of various concretes containing 25% and 50% of fly ash with 1% accelerator; (c) split tensile strength of various concretes containing 25% fly ash, varying steel fiber dosage and 1% accelerator; (d) split tensile strength of various concretes containing 50% of fly ash, varying steel fiber dosage and 1% accelerator

Tab.6 Variation of flexural strength and equivalent flexural strength of concrete

Fig.11 (a) Flexural strength of various concretes containing 25% and 50% of fly ash; (b) flexural strength of various concretes containing 25% and 50% of fly ash and 1% of accelerator; (c) flexural strength of various concretes containing 25% of fly ash, varying steel fiber dosage and 1% accelerator; (d) flexural strength of various concretes containing 50% of fly ash, varying steel fiber dosage and 1% accelerator; (e) snapshot of effective crack bridging of steel fibers at 1.5%

Tab.7 Ultrasonic pulse velocity for various mixture proportions

Fig.12 (a) UPV test values of various concretes for / ratio 0.6 at different curing days; (b) UPV test values of various concretes for / ratio 0.8 at different curing days

Tab.8 Young’s modulus of elasticity and dynamic elastic modulus values for various concrete mixes

Fig.13 (a) Variation of Young’s modulus of concrete for / ratio 0.6 at 28 days; (b) variation of Young’s modulus of concrete for / ratio 0.8 at 28 days

Fig.14 (a) Dynamic elastic modulus of concrete for / ratio 0.6 at 28 days; (b) dynamic elastic modulus of concrete for / ratio 0.6 at 28 days

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