Discussion of 'Characterization and Engineering Properties of Dry and Ponded Class-F Fly Ash' by R. C. Bachus, M. Terzariol, C. Pasten, S. H. Chong, S. Dai, M. S. Cha, S. Kim, J. Jang, E. Papadopoulos, S. Roshankhah, L. Lei, A. Garcia, J. Park, A. Sivaram, F. Santamarina, X. Ren, and J. C. Santamarina

摘要

The authors must be complemented for throwing light on several properties of fly ash including the dynamic properties of Class F fly ash and its diagenetic behavior. The authors project their paper as a documentation of a comprehensive study of Class F fly ash including data compiled from the published literature. Their claim appears to be incomplete for the following reasons. Because India is one of the countries where coal is being used as the primary source of energy, many basic and applied research works have been carried out in India during the 1990s and the first decade of the 21 st century. The most important of these works is the Technology Information, Forecasting and Assessment Council (TIFAC) project, sponsored by the Department of Science and Technology, Government of India, and carried out at the Indian Institute of Science, Bengaluru and elsewhere in India. These research works pertaining to physical properties, chemical properties, compositional behavior, strength behavior, compressibility behavior, permeability behavior, and dispersive behavior of Indian coal ashes and also on fly ash storage, disposal, and utilization systems were published on various platforms (e.g., Dayal et al. 1991; Pandian et al. 1998; Sridharan et al. 1998a, b; Gandhi et al. 2000; Pandian et al. 2000; Sridharan et al. 2000; Pandian et al. 2001a, b; Sridharan et al. 2001; Prakash and Sridharan 2006a, 2009). Based primarily on the Indian coal ash research, a comprehensive reference book was also published (Sridharan and Prakash 2007). This book also throws light on issues such as segregation and layering in an ash pond, variation in specific gravity values, and coal ash stabilization. The paper under discussion does not make any mention of these published works.