Research Articles | Challenge Journal of Concrete Research Letters

Strength Behavior of Mortar Using Fly Ash as Partial Replacement of Cement

Md. Moinul Islam, Md. Saiful Islam


This paper reports the results of an experimental investigation carried out to study the effects of fly ash on strength development of mortar and the optimum use of fly ash in mortar. Cement was partially replaced with six percentages (10%, 20%, 30%, 40%, 50% and 60%) of class F fly ash by weight. Ordinary Portland cement (OPC) mortar was also prepared as reference mortar. Compressive as well as tensile strengths of the mortar specimens were determined at 3, 7, 14, 28, 60 and 90 days. Test results show that strength increases with the increase of fly ash up to an optimum value, beyond which, strength values start decreasing with further addition of fly ash. Among the six fly ash mortars, the optimum amount of cement replacement in mortar is about 40%, which provides 14% higher compressive strength and 8% higher tensile strength as compared to OPC mortar.


fly ash; cement; mortar; compressive strength; tensile strength; hydration

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Tarun, R. Naik., Shiw, S. Singh., and Mohammad, M. Hossain., Permeability of High Strength Concrete Containing Low Cement Factor, Journal of Energy Engineering, 1996, 122 (1), pp.21-39.

Min-Hong, Zhang., Marcia, C. Blanchette., and V, M. Malhotra., Leachability of Trace Metal Elements from Fly Ash Concrete: Results form Column-Leaching and Batch Leaching Tests, ACI Materials Journal, 2001, 98 (2), pp.126-136.

Ozkan, Sengul., and Mehmet, Ali. Tasdemir., 2009, Compressive Strength and Rapid Chloride Permeability of Concretes with Ground Fly Ash and Slag, Journal of Materials in Civil Engineering, 2009, 21 (9), pp.494-501.

Malhotra, V. M., Role of Supplementary Commentating Materials in Reducing Greenhouse Gas Emission, MTL Division Report, Natural Resources Canada, 1988, Ottawa, pp.17.

Elkhadiri, I., Diouri, A., Boukhari.A., Aride, J., Puertas, F., Mechanical behaviour of various mortars made by combined fly ash and limestone in Moroccan Portland cement, Cement and Concrete Research, 2002, 32, pp.1597-1603.

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, 2002, 30 (3), pp. 447-455.

Sanchez, E., Massana, J., Garcimartin, M.A., Moragues, A., 2008, Mechanical strength and microstructure evaluation of fly ash cement mortar submerged in pig slurry, Cement and Concrete Research, 2008, 38, pp. 717-724,

Papadakis, V. G., Tsimas, S., Supplementary Cementing Materials in Concrete Part I: Efficiency and design, Cement and Concrete Research, 2002, 32, pp.1525 1532.

Oner, A., Akyuz, S., Yildiz, R., An Experimental Study on Strength Development of Concrete Containing Fly Ash and Optimum Usage of Fly Ash in Concrete, Cement and Concrete Research, 2005, 35, pp.1165-1171.

Serdar, Aydin., Bulent, Baradan., Effect of Pumice and Fly Ash incorporation on High Temperature Resistance of Cement Based Mortars, Cement and Concrete Research, 2007, 37, pp.988-995.

Rafat Siddique, 2003, Effect of Fine Aggregate Replacement with Class F Fly Ash on the Mechanical Properties of Concrete, Cement and Concrete Research, 2003, 33 (4), pp. 539-547.

Alain, Bilodeau., and V, Mohan. Malhotra., High Volume Fly Ash System: Concrete Solution for Sustainable Development, ACI Materials Journal, 2000, 97 (1), pp.41-47.

Mark, Reiner., and Kevn, Rens., High-Volume Fly Ash Concrete: Analysis and Application, Practice Periodical on Structural Design and Construction, 2006, 11 (1), pp.58-64.

ASTM C 150-86, Standard Specification for Portland Cement, Annual Book of ASTM Standards, 1988, (Vol. 4.01 Cements, Lime, Gypsum), Easton, USA.

ASTM C 109-87, Standard Test Method for Compressive Strength of Hydraulic Cement Mortars, Annual Book of ASTM Standards, 1988, (Vol. 4.01-Cements, Lime, Gypsum), Easton, USA.

ASTM C 190-85, Standard Test Method for Tensile Strength of Hydraulic Cement Mortars, Annual Book of ASTM Standards, 1988, (Vol. 4.01-Cements, Lime, Gypsum), Easton, USA.

Jawed, I., and Skalny, J., Hydration of tricalcium silicate in the presence of fly ash, Effects of Fly Ash Incorporation in Cement and Concrete, Proceedings, Symposium Materials Research Society, 1981, Sidney, pp.60-70.

Yamato, Takeshi and Sugita, Hideaki, Shrinkage and Creep of Mass Concrete Containing Fly Ash, Fly Ash, Silica Fume, Slag and Other Mineral By- Products in Concrete, ACI SP-79, 1983, pp. 87-102.

Korac, Veljko and Ukraincik, Velimir, Studies into the Use of Fly Ash in Concrete for Water Dam Structures, Fly Ash, Silica Fume, Slag and Other Mineral By-Products in Concrete, ACI SP-79, 1983, pp.173-185.

Meland, I., Influence of condensed silica fume and fly ash on the heat evaluation in cement pastes, Fly Ash, Silica Fume, Slag and Other Mineral by-Products in Concrete, ACI SP-79, 1983, Vol.II, pp. 665-676.


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