The growing concern for the environment all over the world, as well as the high cost of Portland cement has placed limitation on its use as the sole binding material in concrete. This work has shown that ashes from some agricultural or other biogenic wastes when mixed with appropriate amounts of ordinary Portland cement (OPC) can be used as low-cost, environmentally, more friendly binders for concrete production, than using OPC alone. Experimental determination of requisite properties of the ashes of rice husk, coconut husk, palm leaf, bamboo leaf and peanut shell revealed that they satisfy the essential requirements for pozzolans. Further experimental work was carried out on OPC/rice husk ash (RHA) and OPC/coconut husk ash (CHA) concretes to determine their essential properties in fresh and hardened states. Although the initial and final setting times of OPC/RHA and OPC/CHA pastes were longer than the setting times of 100% OPC paste, they are all within the limits specified by relevant standards. The workability of fresh concrete produced by partially replacing OPC with either of RHA and CHA was found to be better than with 100% OPC. It was also shown that the porosity of OPC/RHA and OPC/CHA concretes was less than the porosity of OPC concrete. Strength tests using very finely ground RHA and CHA to partially replace Portland cement in concrete production showed that at up to 15% replacement the strength activity index of each of them is greater than 100%, which indicating that they are excellent pozzolans.
Cite this paper
C. Arum, C. Ikumapayi and G. Aralepo, "Ashes of Biogenic Wastes—Pozzolanicity, Prospects for Use, and Effects on Some Engineering Properties of Concrete," Materials Sciences and Applications
, Vol. 4 No. 9, 2013, pp. 521-527. doi: 10.4236/msa.2013.49064
 J. O. Basorun and G. Fadairo, “Government Challenges in Housing the Urban Poor in Ado-Ekiti, Nigeria,” Journal of Sustainable Society, Vol. 1, No. 2, 2012, pp. 3135.
 Alitheia Capital, “Housing—Creating the Right Environment. Lessons from other economies in tackling the housing crisis,” Vol. 24, 2012.
 K. Adegboye, “52 Years of Homelessness: Experts Proffer Solutions to Dearth of Affordable Housing,” Vanguard Mobile Edition, 2012.
 CIA World Factbook, “Nigeria Population, 2012,” 2012.
 WCED, “Our Common Future,” World Commission on Environment and Development, Report No. A/42/427, 1987.
 M. R. Karim, M. F. M. Zain, M. Jamil, F. C. Lai and M. N. Islam, “Necessity and Opportunity of Sustainable Concrete from Malaysia’s Waste Materials,” Australian Journal of Basic and Applied Sciences, Vol. 5, No. 5, 2011, pp. 998-1006.
 M. Thomas, “Supplementary Cementing Materials: Benefits & Limitations,” Materials, Testing & PerformanceBased Specifications, University of New Brunswick.
 British Standards Institution, “Cement—Part 1: Composition,” Specifications and Conformity Criteria for Common Cements, BS EN 197, BSI, London, 2000.
 S. Wansom, S. Janjaturaphan and S. Sinthupinyo, “Pozzolanic Activity of Rice Husk Ash: Comparison of Various Electrical Methods,” Journal of Metals, Materials and Minerals, Vol. 19, No. 2, 2009, pp. 1-7.
 F. B. Tanglao, P. N. Javier and A. L. Robles, “Compressive Strength of Concrete Blended with Calcined Rice Straw Ash,” The 3rd ACF International Conference-ACF/VCA, HoChiminh City, 11-13 November 2008, pp. 592-597.
 A. N. Givi, S. A. Rashid, F. N. A. Aziz and M. A. M. Salleh, “Contribution of Rice Husk Ash to the Properties of Mortar and Concrete: A Review,” Journal of American Science, Vol. 6, No. 3, 2010, pp. 157-165.
 A. A. Akindahunsi and O. Alade, “Exploiting the Potentials of Rice Husk Ash as Supplement in Cement for Construction in Nigeria,” International Journal of Concrete Structures and Materials Vol. 4, No. 1, 2010, pp. 38. doi:10.4334/IJCSM.2010.4.1.003
 J. T. Utsev and J. K. Taku, “Coconut Shell Ash as Partial Replacement of Ordinary Portland Cement in Concrete Production,” International Journal of Scientific & Technology Research, Vol. 1, No. 8, 2012, pp. 86-89.
 United States Department of Agriculture, “Coconut Oil Production by Country in 1000 metric Tons,” 2012.
 British Standards Institution, “Methods of testing cement—Part 3: Determination of Setting Time and Soundness,” BS EN 196, BSI, London, 1995.
 British Standards Institution, “BS 5328: Part 1: Guide to Specifying Concrete; Part 2: Methods for Specifying Concrete Mixes,” BSI, London, 1997.
 British Standards Institution, “Testing Concrete—Part 106: Methods for Determination of Air Content of Fresh Concrete,” BS 1881, BSI, London, 1993.
 British Standards Institution, “Testing Concrete—Part 103: Method for Determination of Compacting Factor,” BS 1881, BSI, London, 1993.
 British Standards Institution, “Testing Concrete—Part 7: Density of Hardened Concrete,” BS 12390, BSI, London, 2000.
 British Standards Institution, “Testing Concrete—Part 116: Method for Determination of Compressive Strength of Concrete Cubes,” BS 1881, BSI, London, 1983.
 ASTM International, “Standard Specification for Fly Ash and Raw or Calcined Natural Pozzolan for Use as a Mineral Admixture in Portland Cement Concrete,” Annual Book of ASTM Standards, ASTM International, West Conshohocken, 1994.
 D. C. Okpala, “Some Engineering Properties of Sandcrete Blocks Containing Rice Husk Ash,” Building and Environment, Vol. 28, No. 3, 1993, pp. 235-241.
 K. Ganesan, K. Rajagopal and K. Thangavel, “Rice Husk Ash Blended Concrete: Assessment of Optimal Level of Replacement for Strength and Permeability Properties of Concrete,” Construction and Building Materials, Vol. 22, No. 8, 2008, pp. 1675-1683.
 A. E. Dakroury and M. S. Gasser, “Rice Husk Ash (RHA) as Cement Admixture for Immobilization of Liquid Radioactive Waste at Different Temperatures,” Journal of Nuclear Materials, Vol. 381, No. 3, 2008, pp. 271-277. doi:10.1016/j.jnucmat.2008.08.026