Some Engineering Properties of Foamed Concrete for Sustainable Technological Development
A study of the technology of foamed concrete production is carried out. The engineering properties and applications of this type of concrete are presented for varying densities so as to effectively tap the advantages of its use for specific purposes. The properties considered are the 7-day compressive strength, thermal conductivity, modulus of elasticity and drying shrinkage. A study of the behaviours of foamed concrete at varying dry densities for the different characteristics was undertaken. Results indicate that as the dry density increases, the engineering properties increase though at different rates for the 7-day Compressive strength, Thermal conductivity, and Modulus of elasticity. The drying shrinkage decreases as the dry density increases. A comparative study of the 7-day Compressive strength and Modulus of elasticity show that they both follow the same trend over the varying dry density except at a dry density of 1200 kg/m3. A comparative study of the thermal conductivity and the percent drying shrinkage indicate that the thermal conductivity is inversely proportional to the percent drying shrinkage. Economics and other considerations together with its multipurpose applications of foamed concrete can open up business opportunities in Africa and sustainability. This can also help in providing needed funds for infrastructural development.
Durack J. M and L.Weiqing, (1998): The properties of foamed air cured fly ash based concrete for masonry production. In: Page.
A, Dhanasekar M, Lawrence S, editors. Proceedings of the Fifth Australasian Masonry Conference, 1998, Gladstone, The Queensland, Australia. p. 129-38.
Eden N.B., Manthrope A. R., Miell S. A., Szymanek P. H and, K. L. Watson, (1980): Autoclaved aerated concrete from slate waste, Part 1-Some property/density relationships. Int J Lightweight Concr 1980;2:95-100.
Falade F. The Potential of Laterite as Fine Aggregate in Foamed Concrete Production. Civil and Environmental Research, Vol.3, No.10, 2013, www.iiste.org ISSN 2224-5790 (Paper) I 2225-0514 (Online).
Kearsley, E. P. and H. F. Mostert, (1997): Foamcrete in Developing Communities, Proceedings FIP Symposium 1997: The Concrete Way to Development, Johannesburg, South Africa, March 1997.
The Concrete Society of Southern Africa, 1997, pp. 735 - 745.
Lushiku, M. D. and E. P. Kearsley (2004): The effect of material composition on the properties of dry shotcrete. Journal of the South African Institute of Civil Engineering, Volume 46 (2) 2004 pp. 2–8.
Oginni, F. A., 2014: Continental Application of Foamed Concrete Technology: Lessons for Infrastructural Development in Africa. British Journal of Applied Science & Technology 5(4): 417-424, 2015, Article no. BJAST.2015.040 ISSN: 2231-0843. SCIENCEDOMAIN international www.sciencedomain.org.
Pospisil F, Jambor J, and J. Belko, (1992): Unit weight reduction of y ash aerated concrete. In: Wittmann FH, editor. Advances in Autoclaved Aerated Concrete. A.A. Balkema, 1992. p. 43-52.
Potgieter, J. H., Potgieter, S. S., Loubser, M., Kearsley, E. P., Strydom, C. A., de Waal, D. and S. Paul (2003): The use of Fly Ash to Treat Waste from the Ferro-alloy Industries. Proceedings of the 11th International Conference on the Chemistry of Cement, May 2003, Durban South Africa, pp. 2148–2155.
Puttappa CG, Rudresh V, Ibrahim A, Muthu KU, Raghavendra HS. Mechanical Properties of Foamed Concrete. International Conference on Construction and Building Technology, ICCBT 2008 - A - (43) – pp. 491-500.
Ramamurthy K and N. Narayanan, (1999): Influence of fly ash on the properties of aerated concrete. In: Proceedings of the International Conference on Waste as Secondary Sources of Building Materials. New Delhi: BMTPC, 1999. p. 276-82.
Rudnai, G. (1963): Lightweight concretes, Budapest: Akademiai Kiado. Short A and W. Kinniburgh (1963): Light weight concretes. Asia Publishing House, 1963.
The Concrete Institute, (2013): Foamed Concrete. Published by the Concrete Institute, Midrand, 2013 © the concrete institute P. O. Box 168, Halfway House, 1685 Block D, Lone Creek, Waterfall Park, Bekker Road, Midrand T 011 315 0300 • F 011 315 0315.
Valore RC. (1954). Cellular concrete part 1 composition and methods of production,ACI j ;50:773-96.
Watson K. L., Eden N. B. and J. R. Farrant, (1977): Autoclaved aerated materials from slate powder and portland cement. Precast Concr 1977:81-5.
Watson K. L. (1980): Autoclaved aerated concrete from slate waste, Part 2 - Some property/porosity relationships. Int J Lightweight Concr 1980;3:121-3.