Open Access

The Impact of Polypropylene Fibre Addition on the CBR Value

Patryk Dobrzycki
Patryk Dobrzycki
   | Jul 20, 2023
Architecture, Civil Engineering, Environment's Cover Image
About this article
Previous Article
Next Article
Cite
Published Online: Jul 20, 2023
Page range: 81 - 88
Received: Jan 15, 2023
Accepted: Mar 17, 2023
DOI: https://doi.org/10.2478/acee-2023-0017
Keywords
© 2023 Patryk Dobrzycki, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Polypropylene fibres with 18 mm in length in the percentage of 0.1%, 0.2% and 0.3% given to the Proctor mould
Polypropylene fibres with 18 mm in length in the percentage of 0.1%, 0.2% and 0.3% given to the Proctor mould

Figure 2.

Grain-size distribution curves for tested soil samples
Grain-size distribution curves for tested soil samples

Figure 3.

Compaction curves of test samples I and II by both compaction method: standard Proctor (SP) and modified (MP)
Compaction curves of test samples I and II by both compaction method: standard Proctor (SP) and modified (MP)

Figure 4.

Compaction curves of grSa with additions of 1.5% cement and 0.2% or 0.3% of fibres by: (a) SP, and (b) MP methods
Compaction curves of grSa with additions of 1.5% cement and 0.2% or 0.3% of fibres by: (a) SP, and (b) MP methods

Figure 5.

Samples during CBR tests without and with an additional load of 2.44 kPa
Samples during CBR tests without and with an additional load of 2.44 kPa

Figure 6.

Dependence of the CBR values on the percentage addition of fibres for both compaction methods for sample II
Dependence of the CBR values on the percentage addition of fibres for both compaction methods for sample II

Figure 7.

Relation of the CBR values on the percentage cement addition for both compaction methods: a) the standard Proctor, b) the modified Proctor
Relation of the CBR values on the percentage cement addition for both compaction methods: a) the standard Proctor, b) the modified Proctor

Geotechnical parameters of the investigated soil

Sample number Material ρs (g/cm3) Compaction method
Standard Proctor Modified Proctor
wopt (%) ρd max (g/cm3) wopt (%) ρd max (g/cm3)
I grSa 2.65 9.00 2.020 8.50 2.085
grSa+1.5%C 2.66 8.90 2.120 8.40 2.130
grSa+3.0%C 2.66 8.80 2.140 8.30 2.150
grSa+4.5%C 2.67 8.70 2.170 8.10 2.176
grSa+6.5%C 2.68 8.50 2.182 7.90 2.190
II grSa 2.65 9.70 1.974 9,60 2.022
grSa+0.1%F 18 mm 2.65 9.80 2.003 8.80 2.104
grSa+0.2%F 18 mm 2.65 8.00 2.054 7.50 2.158
grSa+0.3%F 18 mm 2.65 7.70 2.060 7.00 2.160
grSa+1.5%C 2.66 9.50 2.010 9.50 2.070
grSa+1.5%C+0.2%F 18 mm 2.66 7.90 2.066 7.00 2.183
grSa+1.5%C+0.3%F 18 mm 2.66 8.00 2.060 7.80 2.124

Results of the California Bearing Ratio test

Sample number Material Curing time (days) CBR (%)
Standard Proctor Modified Proctor
Unloaded Loaded 2.44 kPa Unloaded Loaded 2.44 kPa
I grSa 0 40.8 43.3 58.2 99.5
grSa+1.5%C 0 – 11.0 – 28.0
7 – 110.6 – 84.6
28 – 241.5 – 212.1
grSa+3.0%C 0 – 22.72 – 33.20
grSa+4.5%C 0 – 31.21 – 35.99
grSa+6.0%C 0 – 38.50 – 44.93
II grSa 0 19.8 21.0 53.9 68.3
grSa+0.1%F 18 mm 0 – 47.7 – 58.8
grSa+0.2%F 18 mm 0 – 47.5 – 71.7
grSa+0.3%F 18 mm 0 – 39.7 – 64.5
grSa+1.5%C 0 31.5 36.1 65.5 61.2
7 – 195.9 – 205.1
28 – 166.8 – 303.9
grSa+1.5%C+0.3%F 18 mm 0 – 77.5 – 154.5
7 – 310.5 – 276.5
28 – 319.6 – 359.6
eISSN:
2720-6947
Language:
English
Publication timeframe:
4 times per year
Journal Subjects:
Architecture and Design, Architecture, Architects, Buildings
Journal RSS Feed