Investigation Into Sustainable Application of Class C Fly Ash Layer in Flexible Pavement
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 27, Issue 1
Abstract
Global demand for power generation has had an immense impact on thermal power plants that has caused a problem with fly ash disposal. Unless utilized suitably, fly ash deposits turn valuable land into dumping grounds that pose a risk to the environment and human health. In this study, the effectiveness of Class C fly ash (CFA) incorporated in a flexible pavement was investigated, which was based on laboratory and field investigations along with an environmental impact assessment. The laboratory experimentation included durability and repeated load triaxial (RLT) tests and in the field, falling weight deflectometer (FWD) tests were conducted. The test sections with a fly ash layer and a control section were constructed in the field to assess the viability of construction and service life. For the fly ash layer, the back-calculated modulus values were 4.3 and 6.5 times greater than the base and subbase of the control section, respectively. The fly ash section exhibited a service life ratio (SLR) of 1.72 compared with the control section under standard loading conditions. The energy consumed, greenhouse gas (GHG) emissions produced, and capital cost incurred in the construction of the fly ash section were reduced by 67%, 59%, and 25.7%, respectively, compared with the control section. The bulk application of fly ash was advantageous and sustainable due to better structural performance and a significantly reduced environmental impact compared with conventional base and subbase layers.
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References
AASHTO. 2000. Standard specifications for transportation materials and methods of sampling and testing part II. AASHTO T307. Washington, DC: AASHTO.
ASTM. 2017. Standard specification for coal fly ash and raw or calcined natural pozzolan for use. ASTM C618. West Conshohocken, PA: ASTM.
ASTM. 2018. Standard test methods for wetting and drying compacted soil-cement mixtures 1. ASTM D559. West Conshohocken, PA: ASTM.
Balaguera, A., G. I. Carvajal, J. Albertí, and P. Fullana-i-Palmer. 2018. “Life cycle assessment of road construction alternative materials: A literature review.” Resour. Conserv. Recycl. 132 (January): 37–48. https://doi.org/10.1016/j.resconrec.2018.01.003.
Bilodeau, J. P., G. Doré, and L. Perier. 2014. “Falling weight deflectometer analysis of flexible pavement structure built with geotextile drainage layers.” Can. J. Civ. Eng. 41 (6): 540–549. https://doi.org/10.1139/cjce-2013-0217.
BIS (Bureau of Indian Standards). 1967. Method of test for pozzolanic materials. IS-1727. New Delhi, India: BIS.
BIS (Bureau of Indian Standards). 1983. Methods of test for soils, part 8 determination of water content-dry density relation using heavy compaction. IS2720 Part 8. New Delhi, India: BIS.
Bressi, S., M. Primavera, and J. Santos. 2022. “A comparative life cycle assessment study with uncertainty analysis of cement treated base (CTB) pavement layers containing recycled asphalt pavement (RAP) materials.” Resour. Conserv. Recycl. 180: 106160.
Bualuang, T., P. Jitsangiam, and T. Tanchaisawat. 2021. “Sustainable flexible pavement base stabilization with pozzolanic materials incorporating sodium hydroxide and asphalt emulsion.” Transp. Eng. 6: 100094. https://doi.org/10.1016/j.treng.2021.100094.
Camargo, F. F., T. B. Edil, and C. H. Benson. 2013. “Strength and stiffness of recycled materials stabilised with fly ash: A laboratory study.” Road Mater. Pavement Des. 14 (3): 504–517. https://doi.org/10.1080/14680629.2013.779299.
CEA (Central Electricity Authority). 2021. Report on fly ash generation at coal/lignite based thermal power stations and its utilization in the country for the year 2020–21. New Delhi, India: CEA.
Chen, X., and H. Wang. 2022. “Life-cycle assessment and multi-criteria performance evaluation of pervious concrete pavement with fly ash.” Resour. Conserv. Recycl. 177: 105969. https://doi.org/10.1016/j.resconrec.2021.105969.
Cocka, E. 2001. “Use of class C fly ash for the stabilization of an expansive soil.” J. Geotech. Geoenviron. Eng. 127 (7): 568–573. https://doi.org/10.1061/(ASCE)1090-0241(2001)127:7(568).
Deng, Y., X. Luo, Y. Zhang, and R. L. Lytton. 2020. “Determination of complex modulus gradients of flexible pavements using falling weight deflectometer and artificial intelligence.” Mater. Struct. 53: 100. https://doi.org/10.1617/s11527-020-01528-2.
Edil, T. B., H. A. Acosta, and C. H. Benson. 2006. “Stabilizing soft fine-grained soils with fly ash.” J. Mater. Civ. Eng. 18 (2): 283–294. https://doi.org/10.1061/(ASCE)0899-1561(2006)18:2(283).
Gschösser, F., H. Wallbaum, and M. E. Boesch. 2012. “Life-cycle assessment of the production of swiss road materials.” J. Mater. Civ. Eng. 24 (2): 168–176. https://doi.org/10.1061/(asce)mt.1943-5533.0000375.
Haque, N. 2020. “The life cycle assessment of various energy technologies.” In Future energy improved, sustainable and clean options Our planet, edited by T. M. Letcher, 633–647. Amsterdam, Netherlands: Elsevier.
Heidrich, C., I. Hinczak, and B. Ryan. 2005. “SCM’s potential to lower Australia’s greenhouse gas emissions profile.” In Australasian Slag Association Conf. Sydney, Australia: Australasian Slag Association.
Hossain, M. U., J. J. Y. Wong, S. T. Ng, and Y. Wang. 2022. “Sustainable design of pavement systems in highly urbanized context: A lifecycle assessment.” J. Environ. Manage. 305: 114410. https://doi.org/10.1016/j.jenvman.2021.114410.
IFC (International Finance Corporation). 2017. India construction materials database of embodied energy and global environmental indicators for materials warming potential methodology & results version 1.0. Methodology Rep. 1–100. Washington, DC: IFC.
IRC (Indian Road Congress). 2002. Rural roads manual. IRC:SP:20. New Delhi, India: IRC.
IRC (Indian Road Congress). 2014. Guidelines for structural evaluation and strengthening of flexible road pavements using falling weight deflectometer (FWD) technique. IRC:115. New Delhi, India: IRC.
IRC (Indian Road Congress). 2018. Guidelines for the design of flexible pavements (fourth revision). IRC:37. New Delhi, India: IRC.
Kang, X., G. Kang, K. Chang, and L. Ge. 2015. “Chemically stabilized soft clays for road-base construction.” J. Mater. Civ. Eng. 27 (7): 1–9. https://doi.org/10.1061/(ASCE)MT.1943-5533.0001156.
Kolay, P. K., and K. C. Ramesh. 2016. “Reduction of expansive index, swelling and compression behavior of kaolinite and bentonite clay with sand and class C fly ash.” Geotech. Geol. Eng. 34 (1): 87–101. https://doi.org/10.1007/s10706-015-9930-4.
Li, L., C. H. Benson, T. B. Edil, and B. Hatipoglu. 2008. “Sustainable construction case history: Fly ash stabilization of recycled asphalt pavement material.” Geotech. Geol. Eng. 26 (2): 177–187. https://doi.org/10.1007/s10706-007-9155-2.
Mir, B. A., and B. A. Sridharan. 2013. “Physical and compaction behaviour of clay soil–fly ash mixtures.” Geotech. Geol. Eng. 31 (4): 1059–1072. https://doi.org/10.1007/s10706-013-9632-8.
Misra, A. 1998. “Stabilization characteristics of clays using class C fly ash.” Transp. Res. Rec. 1611: 46–54. https://doi.org/10.3141/1611-06.
MOEF (Ministry of Environment and Forests). 2016. “Hazardous and other wastes.” The Gazzate of India, 1981 (i): 1–68.
Moghal, A. A. B. 2017. “State-of-the-art review on the role of fly ashes in geotechnical and geoenvironmental applications.” J. Mater. Civ. Eng. 29 (8): 1–14. https://doi.org/10.1061/(ASCE)MT.1943-5533.0001897.
Nazzal, M. D., and L. N. Mohammad. 2010. “Estimation of resilient modulus of subgrade soils using falling weight deflectometer.” Transp. Res. Rec. 2186: 1–10. https://doi.org/10.3141/2186-01.
NCHRP (National Cooperative Highway Research Program). 2003. Harmonized test methods for laboratory determination of resilient modulus for flexible pavement design. Washington, DC: NCHRP.
Patel, S., and J. T. Shahu. 2016. “Resilient response and permanent strain of steel slag-fly ash-dolime mix.” J. Mater. Civ. Eng. 28 (10): 04016106. https://doi.org/10.1061/(asce)mt.1943-5533.0001619.
Patel, S., and J. T. Shahu. 2018. “Comparison of industrial waste mixtures for use in subbase course of flexible pavements.” J. Mater. Civ. Eng. 30 (7): 04018124. https://doi.org/10.1061/(asce)mt.1943-5533.0002320.
Phanikumar, B. R., and R. S. Sharma. 2007. “Volume change behavior of fly ash-stabilized clays.” J. Mater. Civ. Eng. 19 (1): 67–74. https://doi.org/10.1061/(ASCE)0899-1561(2007)19:1(67).
Ping, W. V., Z. Yang, and Z. Gao. 2002. “Field and laboratory determination of granular subgrade moduli.” J. Perform. Constr. Facil 16 (4): 149–159. https://doi.org/10.1061/(ASCE)0887-3828(2002)16:4(149).
Rahim, A., and K. P. George. 2003. “Falling weight deflectometer for estimating subgrade elastic moduli.” J. Transp. Eng. 129 (1): 100–107. https://doi.org/10.1061/(ASCE)0733-947X(2003)129:1(100).
Rosa, M. G., B. Cetin, T. B. Edil, and C. H. Benson. 2017. “Freeze–thaw performance of fly ash–stabilized materials and recycled pavement materials.” J. Mater. Civ. Eng. 29 (6): 1–13. https://doi.org/10.1061/(ASCE)MT.1943-5533.0001844.
Santos, J., G. Flintsch, and A. Ferreira. 2017. “Environmental and economic assessment of pavement construction and management practices for enhancing pavement sustainability.” Resour. Conserv. Recycl. 116: 15–31. https://doi.org/10.1016/j.resconrec.2016.08.025.
Saride, S., and T. T. Dutta. 2016. “Effect of fly-ash stabilization on stiffness modulus degradation of expansive clays.” J. Mater. Civ. Eng. 28 (12): 04016166. https://doi.org/10.1061/(asce)mt.1943-5533.0001678.
Singh, A., P. Vaddy, and K. P. Biligiri. 2020. “Quantification of embodied energy and carbon footprint of pervious concrete pavements through a methodical lifecycle assessment framework.” Resour. Conserv. Recycl. 161: 104953. https://doi.org/10.1016/j.resconrec.2020.104953.
Sridharan, A., J. P. Prashanth, and P. V. Sivapullaiah. 1997. “Effect of fly ash on the unconfined compressive strength of black cotton soil.” Proc. Inst. Civ. Eng. Ground Improv. 1 (3): 169–175. https://doi.org/10.1680/gi.1997.010304.
Tastan, E. O., T. B. Edil, C. H. Benson, and A. H. Aydilek. 2011. “Stabilization of organic soils with fly ash.” J. Geotech. Geoenviron. Eng. 137 (9): 819–833. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000502.
USEPA. 1992. Method 1311 – toxicity characteristic leaching procedure. Washington, DC: USEPA.
Wen, H., M. P. Tharaniyil, and B. Ramme. 2003. “Investigation of performance of asphalt pavement with fly-ash stabilized cold in-place recycled base course.” Transp. Res. Rec. 1819: 27–31. https://doi.org/10.3141/1819b-04.
Xu, B., S. R. Ranjithan, and Y. R. Kim. 2002. “New relationships between falling weight deflectometer deflections and asphalt pavement layer condition indicators.” Transp. Res. Rec. 1806: 48–56. https://doi.org/10.3141/1806-06.
Yu, H., J. Yin, A. Soleimanbeigi, and W. J. Likos. 2017. “Effects of curing time and fly ash content on properties of stabilized dredged material.” J. Mater. Civ. Eng. 29 (10): 04017199. https://doi.org/10.1061/(asce)mt.1943-5533.0002032.
Zia, N., and P. J. Fox. 2000. “Engineering properties of loess-fly ash mixtures for roadbase construction.” Transp. Res. Rec. 1714: 49–56. https://doi.org/10.3141/1714-07.
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© 2022 American Society of Civil Engineers.
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Received: Apr 18, 2022
Accepted: Jun 28, 2022
Published online: Sep 13, 2022
Published in print: Jan 1, 2023
Discussion open until: Feb 13, 2023
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