Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

The effect of brine waters on engineering characteristics changes of sandstones

Document Type : Original Research Paper

Authors
Z. Jorkesh 1
R. Ajalloeian 2
A. H. Sadeghpour 3
M. J. Kalantar Hormozi
1 M.Sc., Department of Geology, Faculty of Science, University of Isfahan, Isfahan, Iran
2 Associate Professor, Department of Geology, Faculty of Science, University of Isfahan, Isfahan, Iran
3 Assistant Professor, Faculty of Architecture and Art, Kashan University, Kashan, Iran
10.22071/gsj.2017.50276
Abstract
In this research, the effect of salinity on engineering characteristics of sandstones is investigated. For this purpose, two sandstones from abutments and rock fill (Rip-Rap) of Vanyar dam (in Eastern Azerbaijan province) were selected in addition to three water samples (drinking water, semi-brine and brine) to saturate these rock samples. Water content, uniaxial compressive, point load, thawing and freezing, sound velocity, and durability tests were carried out on dry and saturated samples at different time intervals. After 5 months of submerging type 1 and 2 sandstones in brine water, the uniaxial compressive strength values were decreased 13 and 4%, respectively, and after 10 months to 12 and 0.2%, respectively, compared to those of samples prepared using drinking water. By increasing the salinity of the water, the durability values after 10 cycles changed from 2.3 to 4.2% and from 1.8 to 3.2% for sandstones types 1 and 2, respectively.  The sound velocity in a dry sample of sandstones types 1 and 2 was measured as 4450 and 4950 m/sec, respectively, while they reached 4699 and 5255 m/sec, respectively, by increasing salinity. The results show that brine water almost has no effect on thawing and freezing.
Keywords
Sandstone
Vanyar dam
Salinity
Uniaxial compressive strength
Durability
Sound velocity
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Scientific Quarterly Journal of Geosciences
Volume 26, Issue 104
VOL.26, NO104
Summer 2017
Pages 251-260