Rheology of mechanical properties of soft soil and stabilization protocols in the developing countries-Nigeria

Onyelowe, Kennedy C.; Van, Duc Bui; Igboayaka, Clifford; Orji, Francis; Ugwuanyi, Henry

doi:10.1016/j.mset.2018.10.001

Cited by 22 publications

(14 citation statements)

References 15 publications

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“…[34]; the Cubzac-les-Ponts clayey embankment [35,36]; from the site of the dam of Flumet in the Isère in France [14]; and the site of Saint-Laurent des eaux [14], the Bangkok clays [12,15], and the Murro test embankment clay in Western Finland [16] to name only those. e soft soils found in the African continent (tropical zone soils) [37][38][39] have been considered for these comparison in this paper: the settlement of a railway embankment on PVD-improved Karakore soft soil in Ethiopia [39]; the rheology of mechanical properties of soft soil in Nigeria [37]; and various problem on soft clayed soils in South Africa [38]. e results of monitoring of the full scale experimental embankment on soft Douala clays (Littoral region) of Cameroon have been published recently in this domain in the Journal of Civil Engineering [40].…”

Section: Resultsmentioning

confidence: 99%

Assessment of Stiffness and Strength Parameters for the Soft Soil Model of Clays of Cameroon

Ambassa

Amba

2020

Advances in Civil Engineering

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This paper focuses on the advanced modelling of soft Cameroon clays for the global prediction of the behaviour of geotechnical structures. A comprehensive set of experimental data on Cameroon subsoils from the oedometer and triaxial tests are analyzed in this paper in order to determine the stiffness and strength parameters for the Soft Soil model. It is based on 71 soil samples taken from both sides of the construction sites of several major structures across the territory. At the first approach, the soil samples taken were analyzed in a geotechnical laboratory to obtain physical and mechanical identification parameters specific to each soil type. The results obtained reveal that the analyzed soils are generally compressible clays. In the second phase, the law of behaviour of the Soft Soil model was used to characterize these Cameroon soils. Its parameters were obtained after calibration of the results of the laboratory tests obtained in first approach. The results obtained in this article can be compared to the different models obtained on clays soils around the world. The parameters are of the same order of magnitude as other clays modelled around the world.

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Section: Resultsmentioning

confidence: 99%

Assessment of Stiffness and Strength Parameters for the Soft Soil Model of Clays of Cameroon

Ambassa

Amba

2020

Advances in Civil Engineering

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“…Recent studies of soft soil improvement techniques are frequently associated with engineering approaches (Al-Bared et al, 2019;Al-Bared et al, 2018;Jafer et al, 2018;Lemos et al, 2020;Onyelowe et al, 2019;Wang et al, 2019;Zainuddin et al, 2019). Studies of the relationship between mineralogical, microstructure, and mechanical strength properties of soft soil in paddy fields are still lacking.…”

Section: Introductionmentioning

confidence: 99%

Rubber bark dust-zeolite composite improved mechanic strength of soft paddy soil through improved microstructure

Rendana

Idris

Rahim

et al. 2021

Sains Tanah J. Soil Sci. Agroclimatology

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<p>Soft paddy soils are not a stable soil structure that leads to the decline of rice production in Kedah, Malaysia. The soil had high compressibility and water content, and low soil strength thus the agricultural machines could not be operated above this soil. Therefore, this study was conducted to improve the mechanical strength of soft soils in paddy fields using an organic amendment. The organic amendment used in this study was made from amended materials comprising clinoptilolite, kieserite, humic acid, and rubber bark dust. The study was carried out in the paddy field area of Alor Pudak district, Kedah, Malaysia, and it was divided into five treatments of amendment dose, i.e: 0 kg (control or P0), 125 kg (P1), 250 kg (P2), 375 kg (P3) and 500 kg (P4) with each plot size about 0.20 ha. The soil samples were then analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), and the unconsolidated undrained triaxial compression test (UU-test) to characterize their amended properties. The XRD results clearly exhibited changes in the mineralogical composition of all treated plots with an increasing smectite content (1200 to 1300 intensity). Furthermore, the SEM results showed that clay particles in the treated plots have been flocculated to form close-knit, more stable soil structures. After the organic amendment application, the mechanical strength of the treated plots increased to an optimum level (50 kPa in P2) for resisting mechanical pressure from agricultural machinery. Overall, this study of the efficacy of organic amendment offers new insight into a soft paddy soil remediation method that is more effective and economical than the conventional method.</p>

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“…Dr. Erich Schonian is one of those scientists who wrote first about the behavior of hot bitumen's penetration in cracks and voids [17]. Bituminous substances are used to stabilize the soil, particularly for stabilizing subgrade, subbase, or even base course of road carrying higher traffic load [18]. is research paper expostulated upon hot bitumen in soil stabilization for the stability of road embankment.…”

Section: Introductionmentioning

confidence: 99%

Effect of Used Motor Oil and Bitumen as Additive on the Permeability and Mechanical Properties of Low Plastic Soil

Iqbal

Nasir

et al. 2020

Advances in Materials Science and Engineering

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Stability of permeable soils near large-scale water reservoirs for paved and unpaved road pavements is all too frequently compromised due to excessive seepage and the climatic conditions of that area. In this research, a multilevel research approach was adopted by conducting a comparative study of the microspectroscopy through Fourier transform infrared (FTIR) spectra to investigate the maximum absorbance correlation along with mechanical investigations (such as the compressive strength, modified proctor test, California bearing ratio test, and swell percentage test). The native low plastic soil sample (CL) was blended with varying percentages of petroleum additives (bitumen and used motor oil) independently at 0%, 4%, 8%, 12%, 16%, and 20%. A comparison of results in the case of bitumen and used motor oil revealed that a decrease in Atterberg’s limits occurred accompanied by an increase of bitumen blending percentage, while used motor oil (UMO) increased the plastic limit. Maximum dry density (MDD) increases while optimum moisture content (OMC) decreases with the increase in bitumen. Used motor oil (UMO) initially (up to 4%) increased the MDD and subsequently decreased it. Investigative reports show that bitumen causes a decrease in swell percentage and increases California bearing ratio (CBR), whereas UMO causes a continuous increase in percentage swell and decrease in CBR. The addition of bitumen in soil resulted in a decrease in the coefficient of permeability (k), while UMO has a significant result of up to 4%. Regarding the control sample, spectrum analysis through FTIR effectively supports the laboratory results as the intensity of peaks increases with the oil, and bitumen concentration reveals that oil and bitumen impart cementitious property to the soil. Moreover, this research work by experiment supported and strengthened the idea of soil pavement stabilization through bitumen, which gives antiwater stability, and facilitates low-cost construction by obtaining raw material on the spot. UMO adversely affects soil properties beyond 4% addition by weight.

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Rheology of mechanical properties of soft soil and stabilization protocols in the developing countries-Nigeria

Cited by 22 publications

References 15 publications

Assessment of Stiffness and Strength Parameters for the Soft Soil Model of Clays of Cameroon

Assessment of Stiffness and Strength Parameters for the Soft Soil Model of Clays of Cameroon

Rubber bark dust-zeolite composite improved mechanic strength of soft paddy soil through improved microstructure

Effect of Used Motor Oil and Bitumen as Additive on the Permeability and Mechanical Properties of Low Plastic Soil

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