WATER SATURATION INDUCED CHANGES IN THE INDIRECT (BRAZILIAN) TENSILE STRENGTH AND THE FAILURE MODE OF SOME IGNEOUS ROCK MATERIALS

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Serdar YASAR
https://orcid.org/0000-0003-4973-7970
Eren KOMURLU
https://orcid.org/0000-0002-2123-7678

Abstract

The present study concentrates on water induced strength reduction and variation of the failure mode in indirect (Brazilian) tension tests of several igneous rock materials under three moisture cases of oven-dry, air-dry and fully saturated states. In this respect, two andesite and three tuff materials which contain no visible flaws were subjected to indirect tensile strength tests using the Brazilian disc method. Once the tension tests were carried out, photographs of the broken samples were taken to investigate the changes in the failure mode. As a result, it was found that tensile strengths of the samples were highly reduced with the presence of the water and the natural humidity. Additionally, it has been deduced that the failure mode of the samples mainly shifts to central fracturing with the presence of natural moisture and saturation. Although the central crack is the ideal type for the theory of Brazilian tensile strength determination, indefinite contact properties like contact angle and frictions are some notable issues to make only considering failure shapes for the validity of the test results misleading.


Keywords: Failure mode; Igneous Rocks; Strength reduction; Tensile strength


 


DOI 10.35180/gse-2020-0031

Article Details

How to Cite
YASAR, S., & KOMURLU, E. (2020). WATER SATURATION INDUCED CHANGES IN THE INDIRECT (BRAZILIAN) TENSILE STRENGTH AND THE FAILURE MODE OF SOME IGNEOUS ROCK MATERIALS. GeoScience Engineering, 66(1), 60–68. Retrieved from http://geoscience.cz/ojs/index.php/GSE/article/view/302
Section
Research Paper
Author Biography

Serdar YASAR, Karadeniz Technical University, Mining Engineering Department, Turkey

He has a PhD degree from the Mining Engineering Department of Karadeniz Technical University. He is curretly working as a research assistant at Karadeniz Technical University. He has authored more than 30 scientific and international papers.