Development of concrete mixtures with fine lime-pozzolan binder as supplementary cementitious material
Journal: Journal of Building Technology DOI: 10.32629/jbt.v8i1.5215
Abstract
The very high concrete strength and durability achieved in high and ultra-high-performance concrete is associated with a very dense matrix, accomplished through the use of high volumes of very fine mineral additions, such as fly ash, silica-fume, metakaolín and ground quartz sand. The paper reports on a study where a finely ground lime-pozzolan binder (LPB) is used as active mineral addition in concrete. The very fine lime particles, having size between0.1-10µm, can fill the gaps between cement grains, while the larger pozzolan particles, having size between 10-100µm, can fill the gaps between fine aggregate grains; this results in a much denser matrix. The addition of lime during concrete mixing also increases the Ca+2 and OH- ion concentration, which results in a better and faster hydration of both ordinary portland cement (OPC) and pozzolanic reaction products.The use of LPB as an active addition in some ultra-high performance concretes could lowe the cost of the product for equivalent strength and durability performance, through the use of less cement, thus improving the ecologic profile of the material. Results from an initial series of tests are examined in this paper; further testing is required to establish the benefits of the use of LPB in High Performance Concrete. Examples of applications of this work in concretes are also presented.
Keywords
mineral addition; lime-pozzolan binder; compression strength; lime; pozzolan; concrete
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[2] ASTM C 494/C 494M – 99 (1999),Standard Specification for Chemical Admixtures for Concrete, July. Bouzoubaa N., Zhang M. H., Bilodeau A. y Malhotra
[3] V. M. (1998),"Laboratory-produced high-Volume fly ash blended cements: physical properties and compressive strength of mortars", Cement &Concrete Research,Vol.28, No. 11, pp 1555-1569.
[4] Bornemann R. (2002),The role of powders in concrete.6th international Symposium on utilization of high strength / high performance concrete. Leipzig.
[5] Day L. (1992), Pozzolans for use in low cost housing: state of the art report. Department of Civil Engineering. Universidad de Calgary. Report No. CE92-1 . January.
[6] Erdogdu K. (1998),"Effect of fly ash particle size on strength of Portland cement fly ash mortars", Cement&Concrete Research Issue.Vol. 28, No. 9, pp 1109-1117.
[7] Groves G.W y Richardson I.G. (1994), Microcrystalline Calcium Hydroxide in Pozzolanic Cement Pastes, Cement and Concrete Research, Vol. 24, No. 6, pp1191-1196.
[8] Jamal Shannag M. (1995),"Properties of pastes, mortars and concrete containing natural pozzolana", Cement& Concrete Research. Vol. 25, No. 3, pp 647-657.
[9] LamL.,WongL.y Poon C.S. (2000),"Degree of hydration and gel/space ratio of high Volume fly ash/cement systems", Cement & Concrete Research Vol. 30, No. 5, pp 747-756.
[10] Malhotra V.M y Mehta P.K. (1996), Pozzolanic and cementitious materials. Published by Gordon and Breach. UK. 1996.
[11] Martirena J.F. (1994), The Development of Pozzolanic Cement in Cuba, Journal of Appropriate Technology, Vol. 21, No. 2, September, Intermediate Technology Publications, U.K.
[12] NC 95 (2001), Cemento Portland. Especificaciones,Vig, Marzo.
[13] NC 120 (2007), Hormigón Hidráulico. Especificaciones. Vig, Noviembre.
[14]Price L., Worrel E. y Phylipsen D. (1999), Energy Use and Carbon Dioxide Emissions in Energy-Intensive Industries in Key developing Countries. Proceedings of the 1990 Earth Technologies Forum,Washington, DC, September 27-29.
[15] Poon C.S., Lam L. y Wong L. (2000),"A study on high strength concrete prepared with large Volumes of low
calcium ash", Cement & Concrete Research Vol. 30 No. 3, pp 447-455.
[16] Qualin Niu, Naiqian Feng, Jing Yang, Xiaoyan Zheng (2003), Effect of superfine slag powder on cement properties. Cement & Concrete Research Vol. 32, No. 4, pp 615-621.
[17] Schmidt M. (2002), Secondary Fuels and Raw Materials for Cement. Benefit for the environment and cost reduction. Keynote presentation at IV Simposium on Structures and Materials, november. Santa Clara. Cuba.
[18] Swamy R.N (1986),Cement replacement materials.Series "Concrete technology and Design",Volume 3. Surrey University Press. UK.
[19] ShannangM.Jy Yeginobali A. (1995),Properties of pastes, mortars and concretes containing natural pozzolans. Cement &Concrete Research Vol. 25, No. 3, pp 647-657.
[20] Singh N.B (2000),"Hydration of bagasse-ash blended Portland cement", Cement &Concrete Research Vol.30, No. 9, pp 1485-1488.
[21] Schmidt, M. (2003), Ultra-HochleistungsbetonAusganstoffe, Eigenschaften und Leistungsfaehigkeit. Proceedings of the conference Ultra-Hochfester Beton University of Kassel, September. Germany.
[22] Taylor H.F.W. (1993),Cement Chemistry.Academic Press. London.
[23] Taylor M. R., Lydon F. D. y Barr B. I. (1996)"Mix proportions for high strength concrete", Construction and Building Materials Vol. 10, No. 6, pp 445-450.
[24] Williams P., Biernacki J.,Walker R., Meyer M., Rawn J. y Jianming B. (2002), Microanalysis of alkali-activated fly ash-CH pastes. Cement &Concrete Research Vol.32, No. 6, pp 963-972. USA.
[25] Vanderley M. (2002),On the sustainability of the Concrete. Extended version of the paper commissioned by UNEP Journal Industry and Environment.
[26] Zhang M. H., Lastra R. y MalhotraV. M. (1996),"Ricehusk ash paste and concrete:some aspects of hydration and the microstructure of the interfacial zone between the aggregate and paste", Cement &Concrete Research Vol. 26, No. 6, pp 963-977.
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