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Fracture toughness of macro-defect-free cement using small crack techniques

Published online by Cambridge University Press:  31 January 2011

Y-S. Chou ,
J. J. Mecholsky Jr.  and
M. Silsbee
Y-S. Chou
Affiliation:
The Pennsylvania State University, University Park, Pennsylvania 16802
J. J. Mecholsky Jr.
Affiliation:
The Pennsylvania State University, University Park, Pennsylvania 16802
M. Silsbee
Affiliation:
The Pennsylvania State University, University Park, Pennsylvania 16802
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Abstract

The fracture toughness of a macro-defect-free (MDF) cement was calculated from two measurement techniques: (1) indentation-strength method and (2) fracture surface analysis (FSA). It was found that the indentation-strength method, which showed good agreement with FSA, was applicable for estimating the fracture toughness of MDF cement. The ultimate toughness was found to be 1.25 MPa m1/2 for this MDF cement, which contained 3 wt. % polymer. An R-curve (crack-growth-resistance) bchavior was also observed. Scanning electron micrographs showed extensive microcracking on the fracture surface. Microstructural effects are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 8 , August 1990 , pp. 1774 - 1780
Copyright
Copyright © Materials Research Society 1990

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