SYMPOSIA PAPER Published: 01 January 1997

Effect of Slag on Shear Strength of Calcium Bentonite


This study was undertaken to determine the strength of calcium bentonite as affected by cement and slag. Test specimens were prepared with 15% calcium bentonite, 5%to 15% cement, and 7.5% to 10% slag. Undrained triaxial compression tests and unconfined compression tests were performed on different mixes. These test results show that regardless of the proportion of cement and slag, the peak strength occurred at strain equal to or less than 1%. The strength essentially reached its ultimate value at about 2% strain and there was little change in strength beyond this point. The strength of specimens increased as the proportion of slag to cement increased. Pore water pressure at peak strength was positive. With increasing strain and increasing proportion of slag the pore water pressure reduced in magnitude. Specimens which were not subjected to vacuum during preparation showed extremely high negative pore pressures and higher strength.

Author Information

Khera, RP
New Jersey Institute of Technology, University Heights, Newark, NJ
So, LT
New Jersey Institute of Technology, University Heights, Newark, NJ
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Developed by Committee: D18
Pages: 16–25
DOI: 10.1520/STP15639S
ISBN-EB: 978-0-8031-5351-6
ISBN-13: 978-0-8031-2470-7