Unconfined Compressive Strength of Fly Ash Mixed With Lime Precipitated Waste Sludge and Cement
|International Journal of Engineering Trends and Technology (IJETT)|
|© 2014 by IJETT Journal|
|Year of Publication : 2014|
|Authors : Dr. Malik Shoeb Ahmad
Dr. Malik Shoeb Ahmad. "Unconfined Compressive Strength of Fly Ash Mixed With Lime Precipitated Waste Sludge and Cement", International Journal of Engineering Trends and Technology (IJETT), V16(5),216-226 Oct 2014. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
For an effective disposal of fly ash, avoiding environmental pollution, it is necessary to utilize it on a continuous basis for some beneficial purposes. The present study investigated the feasibility and effectiveness of the fly ash along with lime precipitated waste sludge and cement. The Unconfined Compressive Strength (UCS) tests were carried out on the specimens comprising of fly ash (FA), (5 to 35%) lime precipitated electroplating waste sludge (S) and (2-20%) cement at 7 and 28 days of curing periods. The results of UCS tests indicated that the strength of fly ash increases substantially on addition of lime precipitated sludge and cement. It has been observed that compressive strengths of cement stabilized fly ash were smaller than the cement-sludge stabilized mix. It has also been observed that the strength was increasing upto 20% sludge addition to fly ash-cement mix, however, the strength started decreasing on further addition of sludge beyond 20% to the fly ash-cement combination. The most effective percentage of fly ash-cement-sludge was found as 72%FA+20%S+8%C. The UCS of this mix was found as 18 and 25 MPa at 7 and 28 days of curing respectively. This is substantially higher than the UCS of plain fly ash (1.0 and 2.5 MPa) at the same curing periods respectively. The X-ray analyses of some selected samples using EDX technique were also carried to study the elemental analyses of the various mixes. The EDX data showed that the experimental results obtain by UCS tests were in conformity with the chemical findings of EDX
 DiGioia, A.M., Nuzzo, W.L., (1972). Fly ash as structural fill. Journal of Power Division, ASCE 98 (1), 77–92.
 Gandhi, S.R., Dey, A.K., Selvam, S., (1999). Densification of pond ash by blasting. Journal of Geotechnical and Geoenvironmental Engineering, ASCE 125 (10), 889–899.6.
 Ghosh, A., Subbarao, C., (2006). Tensile strength bearing ratio and slake durability of class F fly ash stabilized with lime and gypsum. Materials in Civil Engineering Division, ASCE 18 (1), 18–27.
 Ghosh, A., Subbarao, C., (2007). Strength characteristics of class F fly ash modified with lime and gypsum. Journal of Geotechnical and Geoenvironment Engineering, 133 (7), 757–766.
 Glogowski, P.E., Kelly, J.M., McLaren, R.J., Burns, D.L., (1992). Fly ash design manual for road and site applications. RP2422–2, Prepared for Electric Power Research Institute, GAI Consultants. Inc., PA.
 Gray, D.H., Lin, Y.K. (1972). Engineering properties of compacted fly ash. Journal of Soil Mechanics and Foundations Divisions, ASCE 98 (4), 361–380.
 Kaniraj S.R. and V. Gayathri, (2003). Geotechnical behaviour of fly ash mixed with randomly oriented fiber inclusions, Journal of Geotextiles and geomembranes 21, 123-149.
 Leonards, G.A., Bailey, B. (1982). Pulverized coal ash as structural fill. Journal of Geotechnical Engineering Division, ASCE 108 (4), 517–531.
 Raymond, S., 1958. Utilization of pulverized Raymond, S., (1958). Utilization of pulverized fuel ash. Civil Engineering and Public Works Review, London, vol. 53, pp. 1013–1016.
 Shahu J.T., Patel S. and Senapati A. (2012). Engineering properties of copper slag- fly ash- dolime mix and its utilization in base course of flexible pavement. Journal of Materials in Civil Engineering.
 Chang, J. E., Lin, T. T., Ko, M. S., and Liaw, D. S. (1999). Stabilization/Solidification of sludges containing heavy metals by using cement and waste pozzolans. Journal of Environmental Science Health, 34(5), pp 1143–1160.
 Gitari, W.M., Petrik, L. F., Key, D. L., Okujeni, C. (2010). Partitioning of major and trace inorganic contaminants in fly ash acid mine drainage derived solid residues. Int. J. Environ. Sci. Tech. 7(3):519–534.
 Wu, K., Shi, H., De. Schutter, G., Guo, X. Ye., G. (2012). Preparation of alinite cement from municipal solid waste incineration fly Ash. Cem Concr Com 34(3)322–327.
 Wang, C., Li. J., Sun, X., Wang, L., Sun, X. (2009). Evaluation of zeolites synthesized from fly ash as potential adsorbents for wastewater containing heavy metals. J. Environ. Sci. 21(1)127–136.
 Poon, C. S., Qiao, X. C., Lin, Z. S. (2003). Pozzolanic properties of reject fly ash in blended cement pastes. Cem Concr Res 33(11):1857–1865.
 Zheng, L., Wang, W., Shi, Y. (2010). The effects of alkaline dose and Si/Al ratio on the immobilization of heavy metals in municipal solid waste incineration fly ash-based geopolymer. Chemosphere 79(6):665–671.
 Maschio, S., Tonello, G., Piani, L., Furlani, E. (2011). Fly and bottom ashes from biomass combustion as cement replacing components in mortars production: rheological behaviour of the pastes and materials compression strength. Chemosphere 85(4):666–671.
 Colangelo, F., Cioffi, R., Montagnaro, F., Santoro, L. (2012). Soluble salt removal from MSWI fly ash and its stabilization for safer disposal and recovery as road basement material. Waste Management.
 ASTM C 618 (2003). Specification for fly ash and raw or calcined natural pozzolana for use as a mineral admixture in Portland cement concrete. Philadelphia, U.S.A.
 IS: 269 (1989). Ordinary Portland cement, 33 grade-specifications. BIS, New Delhi.
 IS: 2720 Part 7 (1987). Methods of test for soils: part 7 determination of water content dry density relation using light compaction. BIS, New Delhi.
 Hillier, S. R., Sangha, C. M., Plunkett, B. A., and Walden, P. J. (1999). Long-term leaching of toxic trace metals from Portland cement concrete. Cement Concrete Research, 29, pp 515–521.
 Poon, Chi S., Chen, Zu Q., and Wai, Onyx W. H. (2001). The effect of flow through leaching on the diffusivity of heavy metals in stabilized/solidified wastes. Journal of Hazardous Materials, B81, pp 179–192.
Fly ash, Waste Sludge, Cement, UCS, EDX.