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

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

References

[1] Ondova M, Stevulova N, Estokova A. The study of the properties of fly ash based concrete composites with various chemical admixtures. Procedia Engineering, 2012, 42: 1863–1872

[2] Atiş C D, Karahan O. Properties of steel fibre reinforced fly ash concrete. Construction & Building Materials, 2009, 23(1): 392–399

[3] Nattapong M, Chai J, Charin N, Vanchai S. Effects of binder and CaCl₂ contents on the strength of calcium carbide residue-fly ash concrete. Cement and concrete Composties, 2011, 33: 436–443

[4] Wang Z. Influence of fly ash on the mechanical properties of frame concrete. Sustainable Cities and Society, 2011, 1(3): 164–169

[5] Uygunoğlu T. Effect of fiber type and content on bleeding of steel fiber reinforced concrete. Construction & Building Materials, 2011, 25(2): 766–772

[6] Singh A P, Singhal D. Permeability of steel fibre reinforced concrete influence of fibre parameters. Procedia Engineering, 2011, 14: 2823–2829

[7] Kang S T, Lee B Y, Kim J K, Kim Y Y. The effect of fibre distribution characteristics on the flexural strength of steel fibre-reinforced ultra high strength concrete. Construction & Building Materials, 2011, 25(5): 2450–2457

[8] Acebes M M, Segura M, Moragues I A, Hernandez M G. Study of the influence of microstructural parameters on the ultrasonic velocity in steel-fibre reinforced cementitious materials. Construction & Building Materials, 2011, 25(7): 3066–3072

[9] Ganesh babu K, Siva Nageswara Rao G. Efficiency of fly ash in concrete with age. Cement and Concrete Research, 1996, 26(3): 465–474

[10] Poon C S, Lam L, Wong Y L. A study on high strength concrete prepared with large volumes of low calcium fly ash. Cement and Concrete Research, 2000, 30(3): 447–455

[11] Olivito R S, Zuccarello F A. An experimental study on the tensile strength of steel fiber reinforced concrete. Composites. Part B, Engineering, 2010, 41(3): 246–255

[12] Rajamane N P, Annie Peter J, Ambily P S. Prediction of compressive strength of concrete with fly ash as sand replacement material. Cement and Concrete Composites, 2007, 29(3): 218–223

[13] Berryman C, Zhu J, Jensen W, Tadros M. High percentage replacement of cement with fly ash for reinforced concrete pipe. Cement and Concrete Research, 2005, 35(6): 1088–1091

[14] McCarthy M J, Dhir R K. Development of high volume fly ash cements for use in concrete construction. Fuel, 2005, 84(11): 1423–1432

[15] Siddique R. Performance characteristics of high-volume Class F fly ash concrete. Cement and Concrete Research, 2004, 34(3): 487–493

[16] Bharatkumar B H, Narayanan R, Raghuprasad B K, Ramachandramurthy D S. Mix proportioning of high performance concrete. Cement and Concrete Research, 2001, 23(1): 71–80

[17] Haque M N, Goplan M K, Joshi R C, Ward M A. Strength development of inadequately cured high fly ash content and structural concretes. Cement and Concrete Research, 1986, 16(3): 363–372

[18] Sajedi F, Razak H A. Effects of curing regimes and cement fineness on the compressive strength of ordinary Portland cement mortars. Construction & Building Materials, 2011, 25(4): 2036–2045

[19] BIS (Bureau of Indian Standards) IS 12269–1987: Specification for 53 grade Ordinary Portland cement. New Delhi, India

[20] BIS (Bureau of Indian Standards) IS 383–1970. Specification for coarse and finre aggregates from natural sources for concrete. New Delhi, India

[21] Indian Standard Designation IS 1727–1981. Specification for Fly ash for use as Pozzolanic admixture, Bureau of Indian Standards, New Delhi, India

[22] BIS (Bureau of Indian Standards) IS 5816–1970. Splitting tensile strength of concrete-method of test. New Delhi, India

[23] BIS (Bureau of Indian Standards) IS 13311–1992 (part1). Non-destructive testing of concrete Part 1 Ultrasonic pulse velocity. New Delhi, India

RIGHTS & PERMISSIONS

Higher Education Press and Springer-Verlag Berlin Heidelberg