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Studia Geotechnica et Mechanica
Volume 45 (2023): Issue 3 (September 2023)
Open Access
Compressive and Tensile Strength of Nano-clay Stabilised Soil Subjected to Repeated Freeze–Thaw Cycles
Mahya Roustaei
Mahya Roustaei
,
Mahdi Sabetraftar
Mahdi Sabetraftar
,
Ehsan Taherabadi
Ehsan Taherabadi
and
Meysam Bayat
Meysam Bayat
| Sep 01, 2023
Studia Geotechnica et Mechanica
Volume 45 (2023): Issue 3 (September 2023)
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Article Category:
Original Study
Published Online:
Sep 01, 2023
Page range:
221 - 230
Received:
Oct 22, 2022
Accepted:
May 13, 2023
DOI:
https://doi.org/10.2478/sgem-2023-0009
Keywords
Nano-clay
,
Compressive Strength
,
Tensile Strength
,
Freeze–Thaw Cycles
© 2023 Mahya Roustaei et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Figure 1:
Grain size distribution curves of soil.
Figure 2:
Influence of nano-clay on the (a) compaction curve of clay and (b) normalised maximum dry unit weight and normalised optimum moisture content.
Figure 3:
UCS stress–strain curves of specimens without any freeze–thaw cycles (a), curing time = 0 days (b) curing time = 7 days and (c) curing time = 28 days.
Figure 4:
Unconfined compressive strength of specimens without any freeze–thaw cycles.
Figure 5:
Tensile strength of specimens without any freeze–thaw cycles.
Figure 6:
UCS stress–strain curves of specimens subjected to freeze–thaw cycles: (a) nano-clay content = 0%, (b) nano-clay content = 0.5%, (c) nano-clay content = 1%, (d) nano-clay content = 1.5%, (e) nano-clay content = 2%, (f) nano-clay content = 3%.
Figure 7:
Normalised unconfined compressive strength of the specimens versus number of freeze–thaw cycles: (a) curing time = 0 day, (b) curing time = 7 days, (c) curing time = 28 days.
Figure 8:
Normalised ultimate tensile strength of specimens versus number of freeze–thaw cycles: (a) curing time = 0 day, (b) curing time = 7 days, (c) curing time = 28 days.
Properties of nano-clay particles.
Parameter
Typical dry particle sizes
γ
d
(g/cm
3
)
G
s
90% less than
50% less than
10% less than
Value
10 μm
6 μm
2 μm
1.98
1.6
Geotechnical properties of clayey soil.
Parameter
Liquid limit (LL) (%)
Plastic limit (PL) (%)
Plastic index (PI) (%)
G
s
Value
36
20
16
2.757
Summary of the test's details.
Test group
Nano-clay content (%)
No. of freeze–thaw cycles
Curing time (days)
No. of tests
Group 1
0.5, 1, 1.5, 2 and 3
0
0, 7 and 28
15 UCS
†
, 15 STS
‡
Group 2
0.5, 1, 1.5, 2 and 3
0, 1, 3, 6, 9 and 11
0, 7 and 28
90 UCS; 90 STS