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Model tests on geosynthetic-encased construction concrete debris column in fly ash fill

  • Rajeev BhatiaEmail author
  • Arvind Kumar
Technical Note
  • 102 Downloads

Abstract

Providing geosynthetic-encased stone columns is a commonly adopted technique to improve the load-carrying capacity and reduce settlements in weak fills. Addressing the geo-environmental aspect, two different waste materials, i.e., fly ash and concrete debris, have been used for the sustainable environmental management. This paper presents a series of model tests results carried on single unencased and geosynthetic-encased construction concrete debris (CCD) column installed in fly ash fill under short-term loading. Footing size was taken as twice the column diameter for 25% area replacement ratio. Two sizes of columns, 50 mm and 75 mm diameter, have been used for both end-bearing and floating end conditions. The results were analyzed in terms of bearing capacity ratio and settlement ratio. Experimental model tests clearly show that circumferential geosynthetic encasement greatly influences the ultimate load-carrying capacity of CCD column and reduces settlement of treated fly ash fill bed.

Keywords

Fly ash fill Construction concrete debris Geosynthetic encasement End-bearing column Floating column Area replacement ratio 

Abbreviations

BCR

Bearing capacity ratio

CCD

Construction concrete debris

D

Diameter of the column

EB

End-bearing column

F

Floating column

FAF

Fly ash fill

FOS

Factor of safety

GESC

Geosynthetic-encased stone column

l

Length of encasement

L

Length of the CCD column

OSC

Ordinary stone column (un-encased)

SR

Settlement ratio

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Civil EngineeringDr. B. R. Ambedkar National Institute of TechnologyJalandharIndia

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