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Effect of the Addition of Dispersed Reinforcement on the Resilient Modulus of Slightly Cemented Non-Cohesive Soil

Mariola Wasil

Mariola Wasil

Faculty of Civil Engineering and Environmental Sciences, Bialystok University of TechnologyBiałystok,
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Wasil, Mariola
, 
Patryk Dobrzycki

Patryk Dobrzycki

Faculty of Civil Engineering and Environmental Sciences, Bialystok University of TechnologyBiałystok,
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Dobrzycki, Patryk
 e 
Katarzyna Zabielska-Adamska

Katarzyna Zabielska-Adamska

Faculty of Civil Engineering and Environmental Sciences, Bialystok University of TechnologyBiałystok,
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Zabielska-Adamska, Katarzyna
  
30 set 2023
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Categoria dell'articolo: Special Issue 19th KKMGiIG
Pubblicato online: 30 set 2023
Pagine: 293 - 303
Ricevuto: 01 mar 2023
Accettato: 23 giu 2023
DOI: https://doi.org/10.2478/sgem-2023-0013
Parole chiave
© 2023 Mariola Wasil et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1:

Grain size distribution curve of tested soil.
Grain size distribution curve of tested soil.

Figure 2:

Different lengths (and diameters) of fibres in the amount of 0.2% in reference to the dry mass of the sample that was added to the coarse soil: a) 12 mm (0.030 mm), b) 18 mm (0.034 mm), c) 40 mm (0,90 mm).
Different lengths (and diameters) of fibres in the amount of 0.2% in reference to the dry mass of the sample that was added to the coarse soil: a) 12 mm (0.030 mm), b) 18 mm (0.034 mm), c) 40 mm (0,90 mm).

Figure 3:

Soil mixed mechanically with fibres: a) 40 mm long; b) 18 mm long.
Soil mixed mechanically with fibres: a) 40 mm long; b) 18 mm long.

Figure 4:

Compaction curves of gravelly sand and gravelly sand with 1.5% of cement addition compacted by two methods: a) SP, b) MP.
Compaction curves of gravelly sand and gravelly sand with 1.5% of cement addition compacted by two methods: a) SP, b) MP.

Figure 5:

Compaction curves of gravelly sand with different amounts of fibres 18 mm long compacted by two methods: a) SP, b) MP.
Compaction curves of gravelly sand with different amounts of fibres 18 mm long compacted by two methods: a) SP, b) MP.

Figure 6:

Principle of triaxial testing with cyclic loading
Principle of triaxial testing with cyclic loading

Figure 7:

Sample behaviour under cyclic loading in a triaxial cell during one of the initial cycles of the 15th sequence subjected to grSa+1.5%C+0.3%F_18 mm sample compacted with SP method.
Sample behaviour under cyclic loading in a triaxial cell during one of the initial cycles of the 15th sequence subjected to grSa+1.5%C+0.3%F_18 mm sample compacted with SP method.

Figure 8:

Sample behaviour subjected to cyclic loading/unloading in the triaxial cell during 100 cycles of the 15th sequence for grSa+1.5%C+0.3%F_18 mm sample compacted SP method, tested after 7 days of curing.
Sample behaviour subjected to cyclic loading/unloading in the triaxial cell during 100 cycles of the 15th sequence for grSa+1.5%C+0.3%F_18 mm sample compacted SP method, tested after 7 days of curing.

Figure 9:

Resilient modulus Mr values obtained after 7 and 28 days of curing for samples with 1.5% cement and 0.2% fibres of different lengths compacted by: a) SP method; b) MP method.
Resilient modulus Mr values obtained after 7 and 28 days of curing for samples with 1.5% cement and 0.2% fibres of different lengths compacted by: a) SP method; b) MP method.

Figure 10:

Resilient modulus Mr values obtained after 7 and 28 days of curing for samples with 1.5% cement and 0.3% fibres of different lengths compacted by: a) SP method; b) MP method.
Resilient modulus Mr values obtained after 7 and 28 days of curing for samples with 1.5% cement and 0.3% fibres of different lengths compacted by: a) SP method; b) MP method.

Figure 11:

Mr values of samples tested after 7 days of curing compacted by SP method with different fibres content: a) grSa+1.5%C+0.2%F_18 mm b) grSa+1.5%C+0.3%F_18 mm.
Mr values of samples tested after 7 days of curing compacted by SP method with different fibres content: a) grSa+1.5%C+0.2%F_18 mm b) grSa+1.5%C+0.3%F_18 mm.

Figure 12:

Mr values of samples tested after 7 days of curing compacted by MP method with different fibres content: a) grSa+1.5%C+0.2%F_18 mm b) grSa+1.5%C+0.3%F_18 mm.
Mr values of samples tested after 7 days of curing compacted by MP method with different fibres content: a) grSa+1.5%C+0.2%F_18 mm b) grSa+1.5%C+0.3%F_18 mm.

Figure 13:

Mr values of samples tested after 7 days of curing compacted by SP method with different fibres content: a) grSa+1.5%C+0.2%F_12 mm b) grSa+1.5%C+0.3%F_12 mm.
Mr values of samples tested after 7 days of curing compacted by SP method with different fibres content: a) grSa+1.5%C+0.2%F_12 mm b) grSa+1.5%C+0.3%F_12 mm.

Figure 14:

Mr values of samples tested after 7 days of curing compacted by MP method with different fibres content: a) grSa+1.5%C+0.2%F_12 mm b) grSa+1.5%C+0.3%F_12 mm.
Mr values of samples tested after 7 days of curing compacted by MP method with different fibres content: a) grSa+1.5%C+0.2%F_12 mm b) grSa+1.5%C+0.3%F_12 mm.

Values of Mr obtained for samples after different compaction and curing periods_

Samples Resilient modulus Mr (MPa) Curing period
SP compaction MP compaction (days)
grSa+1.5%C 197 168 7
272 353 28
grSa+1.5%C+0.2%F_12 mm 73 165 7
162 177 28
grSa+1.5%C+0.3%F_12 mm 193 224 7
178 236 28
grSa+1.5%C+0.2%F_18 mm 271 215 7
202 230 28
grSa+1.5%C+0.3%F_18 mm 301 226 7
214 241 28
grSa+1.5%C+0.2%F_40 mm 51 140 7
145 153 28

The specific density and compaction parameters of tested materials_

Sample ρs(Mg/m3) Proctor compaction method
Standard Modified
wopt (%) ρd max (Mg/m3) wopt (%) ρd max (Mg/m3)
grSa 2.65 9.7 1.974 9.6 2.022
grSa+1.5%C 2.66 9.5 2.010 9.5 2.070
grSa+1.5%C+0.2%F_12 mm 2.66 9.4 2.075 7.9 2.150
grSa+1.5%C+0.3%F_12 mm 2.66 8.9 2.103 6.8 2.170
grSa+1.5%C+0.2%F_18 mm 2.66 7.9 2.066 7.0 2.183
grSa+1.5%C+0.3%F_18 mm 2.66 8.0 2.060 7.8 2.124
grSa+1.5%C+0.2%F_40 mm 2.66 8.8 2.108 7.5 2.144
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