Collapse Behavior of Compacted Coal Ash Fills
Pusadkar, SS
Department of Civil Engineering, Government College of Engineering, Amravati, India

Ramasamy, G
Department of Civil Engineering, Indian Institute of Technology, Roorkee, India

(Received 18 December 2003; accepted 24 September 2004)

Abstract
Coal ash is widely used in construction of embankments and fills. Compacted coal ash fills are likely to undergo collapse on inundation due to rise of water table or infiltration of rainwater. This paper brings out various factors influencing collapse potential of coal ash. Single oedometer and double oedometer collapse tests and plate load collapse tests were carried out on compacted fly ash (FA), bottom ash (BA), and mixture of fly ash and bottom ash in equal proportion (FA50 + BA50). The results reveal that fly ash is susceptible to collapse, while bottom ash and FA50 + BA50 show negligible collapse. However, a plate load collapse test conducted on compacted ash bed of FA50 + BA50 shows large settlement of plate on inundation. This suggests that the use of the results of single oedometer collapse tests can help estimate only that component of settlement of footing or test plate that is due to compression of the test bed on inundation, and not the total settlement that is due to both collapse compression and shear deformation of the loaded bed.

Keywords:
bottom ash, coal ash, collapse, fills, fly ash, plate load test, settlement

Paper ID: GTJ12466
DOI: 10.1520/GTJ12466

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Author Pusadkar, SS Affiliation Department of Civil Engineering, Government College of Engineering, Amravati, India Author Ramasamy, G Affiliation Department of Civil Engineering, Indian Institute of Technology, Roorkee, India Author Pusadkar SS, Ramasamy G Title Collapse Behavior of Compacted Coal Ash Fills Symposium , Committee on