Stabilization of laterite soil using reclaimed asphalt pavement and sugarcane bagasse ash for pavement construction
Abstract
A laboratory study was carried out to evaluate the strength of laterite soil stabilizedwith recycled asphalt pavement (RAP) and sugarcane bagasse ash (SCBA). Thelaterite soil was mixed with RAP in 40/60 ratio and treated with SCBA at 0, 2, 4, 6, 8and 10 % by weight of the soil-RAP mixture. Particle size analysis, compaction test,unconfined compressive strength, (UCS), and California bearing ratio (CBR), testswere carried out on the prepared specimens. The results obtained show that additionof RAP reduces the optimum moisture content, (OMC), and increases the maximumdry density (MDD) of the sample as compared with the natural soil while the additionof SCBA up to 4% results in further increase in MDD; further addition of SCBAresults in reduced MDD whereas OMC increased with increasing SCBA. UCS andCBR increased with SCBA treatment and curing period respectively. Soaking of thespecimens for 24 hours results in reduced CBR values. Based on the laboratory resultsobtained and based on the strength criteria for soil-lime adopted in this study, it wasobserved that 6 to 8% SCBA treatment of the soil-RAP mixture yielded the best resultsmeeting the requirement for sub base course and 10% SCBA treatment gives the bestresults meeting the requirement for base course for light trafficked roads.
References
Areola O., 1982. Soil in Nigeria Maps, Edition by Barhous K. M. Hodder and Stoughton London.
Decker, D. S. & Young, T. J., 1996. Handling RAP in an HMA Facility. Proceedings of the Canadian
Technical Asphalt Association, Edmonton, Alberta.
Federal Ministry of Works, 1997. Nigerian General Specification on Road and Bridgeworks, Federal
Government of Nigeria , Lagos, Nigeria.
Gidigasu, M. D. & Dogbey, J. L. K., 1980. Geotechnical characteristics of laterized ecomposed rocks for
pavement construction in dry sub-humid environment. 6th Southeast Asian conf. On soil engineering.
: 493 – 506 Taipei.
Gidigasu, M. D., 1982. Importance of material selection, construction control and field performance
studies in developing acceptance specification for lateritic paving gravels. Solos e Rochas, 5(1),
Rio de Janeiro.
Hanks, A. J. & Magni. E. R., 1989. The Use of Bituminous and Concrete Material in Granular Base and
Earth. Materials Information Report MI-137, Engineering Materials Office, Ontario Ministry of
Transportation, Downsview, Ontario.
Ingles O. G., Metcalf J. A., 1972. Soil Stabilization principles and practice, Butter worth Sydney.
– 375.
Kallas, B. F., 1984. Flexible Pavement Mixture Design Using Reclaimed Asphalt Concrete, FHWA/RD-
/088.
Mohammedbhai, G. T. G & Baguant, B. K. 1985. Possibility of using Bagasse ash and other Furnance
Residue as Partial Substitute for Cement in Mauritius. Revue Agricole et ucrlere de l’jje Maurice.
(3).
Nicholson, P. G., Kashyap, V. & Fuji, C. F., 1994. Lime and fly ash admixture improvement of tropical
hawaiian soil. Transport Research Record. No. 1440. National Academy press, Washington D.C.
Ola, S.A., 1974. Need for estimated cement requirements for stabilizing lateritic soil. Journal of
Transportation Engineering, ASCE, 17 (8): 379-388.
Ola S. A., 1975. Stabilization of Nigerian laterite soil with cement , bitumen and Lime Sixth Reg .
Confab For Africa Soil Mechanic and Foundation on Engineering Durban South Africa, Sept.
-152.
Osinubi, K. J., 1995. Lime modification of black cotton soil. Spectrum Journal 2 (1 & 2): 112-122.
Osinubi, K. J. and Medubi, A., 1998. Evaluation of cement and phosphatic waste admixture on tropical
black clay road foundation. Proc. Of the 4th Int. Conf. on Sructural Engineering Analysis and
Modelling (SEAM 4). Accra, 2: 297-307.
Osinubi, K. J., 1998b. Influence of compaction delay on the properties of cement- stabilised lateritic soil.
Journal of Engineering Research, 6(1):13 - 26.
Osinubi K. J., 2000. Laboratory trial of soil stabilization using pulverized coal bottom ash. Nigerian
Society of Engineers Technical Transaction, 35(4) 13-21.
Osinubi , K. J., 2001. Influence of compaction energy levels and delay on cement treated soils. The
Nigerian Society of Engineers Technical Transactions. 36(4):13-21.
Rupnow,T. D., 2002. Subgrade stabilization using RAP and Fly Ash, Iowa State University, Midwest
Transport Consortium.
Smith, Richard W., 1980. State-of-the-Art Hot Recycling. Transportation Research Board, Record No.
, Proceedings of the National Seminar on Asphalt Pavement Recycling, Washington, DC.
