Leachability of Self-Compacting Concrete (SCC) Incorporated With Fly Ash and Bottom Ash by Using Static Leaching Procedure (SLT)

Abstract:

The growing demand for electricity resulted in the construction of many coal fired power plants. The increment of the consumption of coal by power plants lead up to production of coal ash. Coal ash contains a range of toxic elements that may have negative effects to human and environmental health. Fly ash (FA) and bottom ash (BA) are the solid residues and mostly arise from coal combustion that being disposed in large quantities every year. The focus of the study is to determine the leachability of Self-Compacting Concrete (SCC) incorporated with FA and BA by using Static Leachate Test (SLT) method. In this study, FA and BA were collected from Kapar Energy Ventures Coal Power Plant in Selangor. The characteristics of Ordinary Portland cement (OPC), FA and BA were determined by using X-Ray Fluorescent (XRF) technique. The different percentages of FA (replace cement) and BA (replace sand) which is 0%, 10%, 20% and 30% were incorporated respectively into SCC. Ten reactors were set up for the leachability test for each solid specimen by using SLT method. The concentrations of leachate samples were analyzed for selected heavy metals content by using Atomic Absorption Spectroscopy (AAS) method. After 40 days conducting the test, the concentrations of selected heavy metals (As, Mn, Cu, Cr, Zn, Ni, Fe and Pb) in the synthetic acid rain leachates from the SCC specimens were significantly lower than the limit specified by the USEPA and EPAV. Therefore, incorporating of FA and BA up to 30% into SCC is potentially feasible.

• Periodical: Applied Mechanics and Materials (Volumes 773-774)
• Pages: 1261-1265
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.773-774.1261
• Online since: July 2015
• Authors: Aeslina Abdul Kadir, Mohd Ikhmal Haqeem Hassan*, Syed Khairul Hafizi bin Syed Mohamad
• Keywords: Bottom Ash, Fly Ash, Heavy Metal, Leachability, Self-Compaction Concrete, Waste Products

References

[1] ACAA, Coal Combustion Product (CCP) Production and Use Survey. Ash at work (Winter/Spring): 25, (2003).

[2] H.W. Huang. The Use of Bottom Ash in Highway Embankments, Subgrade and Subbases. Joint Highway Research Project, Final Report, FHWA/IN/JHRP- 90/4 Purdue University, W. Lafayette, Indiana, (1990).

DOI: 10.5703/1288284314179

[3] B. Kim, M. Prezzi, & R. Salgado, Geotechnical properties of fly and bottom ash mixtures for use in highway embankments., J. Geotech. Geoenviron. Eng., 131(7), 914–924, (2005).

DOI: 10.1061/(asce)1090-0241(2005)131:7(914)

[4] M. Muhardi, A. Kasim, K.A., Makhtar, A.M., Lee, F.W. & Yap, S.L. Engineering Characteristic of Tanjung Bin Col Ash,. Vol. 15.

[2010] Bunk. K. (2010).

[5] USEPA, (United State Environmental Protection Agency). Wastes – Resource Conservation – Reduce, Reuse, Recycle – Industrial Materials Recycling. Available online http: /www. epa. gov/epawaste/conserve/rrr/imr/ccps/flyash. htm (accessed on 12th April 2010).

[6] M.H. Syahrul, F. Muftah, & Z. Muda. The properties of special concrete using washed bottom ash (WBA) as partial replacement,. International Journal of Sustainable Construction Engineering & Technology. Vol. 1, No. 2 pp.65-76. (2010).

[7] M. Sonebi. Medium strength self-compacting concrete containing fly ash: Modelling using factorial experimental plans. Cement Concrete Re; 34: 1199–208. (2004).

DOI: 10.1016/j.cemconres.2003.12.022

[8] EFNARC, (European Federation of National Trade Associations representing producers and applicators of specialist building products). Specification and guidelines for self-compacting concrete. Hampshire, UK; February (2002).

[9] BS EN 12350: 2010, Testing fresh concrete – part 8, 11 and 12: Self-Compacting Concrete , (2010).

[10] BS EN 12390-3: 2000, Testing hardened concrete – part 2: making and curing specimens for strength tests, (2000).

[11] USEPA, Synthetic Precipitation Leaching Procedure (SPLP), Method 1312, September (1994).

[12] USEPA, Hazardous Waste Characteristics Scoping Study, US Environmental Protection Agency, Office of Solid Waste, (1996).

[13] EPAV, Guidelines for Hazard Classification of Solid Prescribed Industrial Waste, Publication 996, June, (2005).

[14] J.M. Chimenos, O. Gines, A. Vizcarro, J. Formosa, & J. R Rosell. Combined use of MSWI bottom ash and fly ash as aggregate in concrete formulation: Environmental and mechanical considerations. (2009).

DOI: 10.1016/j.jhazmat.2009.03.141

[15] T. Sabbas, A. Polettini, R. Pomi, T. Astrup, O. Hjelmar, P. Mostbauer, G. Cappai, G. Magelf, S. Salhofer, C. Speiser, S. Heuss-Assbicher, P. Klein, R. Lechner. Management of municipal solid waste inceniration residues. Waste Manage. 23, 61-88. (2003).

DOI: 10.1016/s0956-053x(02)00161-7

[16] J. Todorovic, H. Ecke, A. Lagerkvist. Solidification with water as a treatment method for air pollution control residues. Waste Manage, 23, 621-629. (2003).

DOI: 10.1016/s0956-053x(03)00106-5