EFFECT OF COARSE AGGREGATE SIZES ON THE COMPRESSIVE STRENGTH OF CONCRETE USING RESPONSE SURFACE METHODOLOGY

Richie I. Umasabor & Effort O. Osayogie

Abstract

This paper examined the effect of coarse aggregate sizes on the compressive strength of concrete using response surface methodology. It has become imperative to carry out this study to ascertain which aggregate size, will produce the optimum compressive strength, which may guide engineers when using it in the construction industry. Regression equations relating the compressive strength of concrete using various aggregate sizes with both the curing duration, fine aggregate, cement and water/cement ratios were developed. The adequacy of the model was checked using the coefficient of determination (R2 ). The results showed that the 9.5 mm aggregate sized concrete had 35 N/mm2 as compressive strength for 28 days curing duration, while the 12.5 mm aggregate sized concrete had 24 N/mm2 as compressive strength for 28 days curing duration and the 19 mm aggregate sized concrete’s compressive strength was 23 N/mm2 when cured for 28 days. The compressive strength of 9.5 mm aggregate sized concrete had an increase of 1.46% and 1.52% over the 12.5 mm and 19 mm aggregate sized concrete’s compressive strength. The low coefficient of determination (R2 ) of 0.1270 for 9.5 mm aggregate sized concrete, R2 of 0.1322 for 12.5 mm aggregate sized concrete and R2 of 0.1243 for 19 mm aggregate sized concrete shows that the linear model could not predict the compressive strengths of the different aggregate sized concrete efficiently. Read full PDF

Keywords: compressive strength, aggregate sizes, regression, coefficient of determination

References

[1] Woodford, C. (2016). Concrete and reinforced concrete. http://www.explainthatstuff.com/steelconcrete.html. Accessed November, 2016.

[2] Neville, A.M. (2005), “Properties of Concrete”. Fourth and Final Edition , Wiley, New-York and Longman, London.

[3] Nevile A.M. (2011). “Properties of Concrete”. Longman, Fifth Edition, Pearson Education Limited, Essex, United Kingdom

[4] Chen B, Liu J (2004). Effect of aggregate on the fracture behavior of high strength concrete. Construction Buildings. 18(8):585-590

[5] Oduroh P, Mahboub K, Anderson R (2000). Flat and elongated aggregates in Super pave regime. J. Civ. Eng. 12(2):124- 130.

[6] Abdullahi, M. (2012): “Effect of aggregates type on compressive strength of concrete” International Journal of Civil Engineering and Structural Engineering, 2(3), pp.791

[7] Waziri B. S., Bukar, A. G and Gaji, Y. Z. (2011). Applicability of quarry sand as a fine aggregate. Continental J. Engineering Science. Vol.6, No.2, pp. 1-6

[8] Wight J (2012). Reinforced Concerete Mechanics and Design. New York: Pearson Education.

[9] Masad E., Rezaei A. and Chowdhury A. (2011). Field Evaluation of Asphalt Mixture Skid Resistance and Its Relationship to Aggregate Characteristics. FHWA/TX11/0-5627-3.

[10] Golterman, P., Johansen, V., and Palbfl, L.(1997) “Packing of Aggregates : An Alternative Tool to Determine the Optimal Aggregate Mix”, ACI Materials Journal, Vol. 94, No. 5, pp.435

[11] Johansen, K. and T. A. Hammer (2002) “Drying Shrinkage of Norwegian Self-Compacting Concrete”, SINTEF Civil and Environmental Engineering, 7465 Trondheim Norway.

[12] Shilstone, J.M. 2007. Worlwide Standards for Concrete Mixtures for Safe and Durable Runways and Taxiways. International Air Transport Conference. Dallas-Fort Worth Texas: ASCE, pp.237-250.

[13] Kwan, A. and Mora, C.F.( 2000) “Sphericity, shape factor, and convexity measurement of coarse aggregate for concrete using digital image processing” Cement and Concrete Research 30(3):351-358 DOI :10.1016/S0008-8846(99)00259-8

[14] British Standard Institution BS 1881: Part 124 (1988) ‘Methods of Analysis of Hardened Concrete’. Her Majesty’s Stationary Office: London, United Kingdom. https://doi.org/10.3403/00048788u

[15] Vilane, B.R.T and Sabelo, N. (2016) “The effect of aggregate size on the compressive strength of concrete” Journal of Agricultural Science and Engineering, Vol.2, No.6, pp.66-69

[16] Dawood ET, Ramli M (2011). Contribution of Hybrid Fibers on The Hybrid Fibers on the Properties of High Strength Concrete Having High Workability. Procedia, pp. 814-820.