scholarly journals Assessment of Geotechnical Parameters of Lateritic Soil of Jos and Environs, for Civil Engineering Constructions North Central part of Nigeria

2020 ◽  
Vol 3 (3b) ◽  
pp. 222-239
Author(s):  
E Vincent ◽  
P Dominic ◽  
MM Kure
Keyword(s):  
Moisture Content ◽  
Civil Engineering ◽  
Biotite Granite ◽  
Engineering Properties ◽  
Dry Density ◽  
Sieve Analysis ◽  
Base Line ◽  
Silty Clay ◽  
Geotechnical Parameters ◽  
Engineering Construction

Due to failures of Civil Engineering structures in Jos and its Environs, Geotechnical parameters of Lateritic soils were carried out in order to determine its engineering properties for civil engineering construction. The methods involved are; reconnaissance survey, site works, laboratory tests based on British Standard (BS) methods and interpretation of the results. The laboratory test of the soils revealed that the Atterberg limit; Liquid limit (LL) ranged from 33.0% to 45.0%, Plastic limit (PL) from 16.23% to 26.37%, and Plasticity index (PI) from 8.63% to 22.67%. The percentage passing from the Sieve analysis ranges from 31.62% to 67.66%. The cohesive strength (c) and angle of internal friction (ø) from direct shear test ranged from 13KN/m2 to 24KN/m2 and 9° to 26°. The values of the Total settlement (Pc) from the Consolidation test ranged from 0.0005m to 0.0019m, Soil pH from 5.2 to 7.8, Specific gravity (SG) from 2.57 to 2.73 and Natural Moisture Content (NMC) from 8.18% to 46.36%. From the compaction test; the Optimum Moisture Content (OMC) ranged from 15.22% to 20.60% and Maximum Dry Density (MDD) from 1.62g/cm3 to 1.84g/cm3. The California Bearing Ratio (CBR) test for the soaked soils ranged from 21.0% to 93.0% and Un-soaked values from 50.75% to 96.61%. The findings reveal that; the geology of the area can be largely classified into granites (Biotite-microgranite, N’gell biotite-granite, Jos-biotite-granite and Aplo-pegmatitic granite-gneiss) and laterites. The geotechnical parameters of the soil are characteristically fair to poor, the strength and deformation of the soil reveals that it can mostly be used as a sub-base materials. The soil is classified as silty-clay, and the area need to be stabilized with cement, sand and gravel before carry civil engineering constructions. The results obtained will serve as base-line information for civil engineering construction in the study area in other to avoid structural damage.

scholarly journals Geotechnical Properties of Fresh and Degraded MSW in the Foothill of Shivalik Range Una, Himachal Pradesh

2019 ◽  
Vol 8 (2) ◽  
pp. 363-374 ◽  
Keyword(s):  
Moisture Content ◽  
Himachal Pradesh ◽  
Engineering Properties ◽  
Dry Density ◽  
Maximum Dry Density ◽  
Overburden Pressure ◽  
Dump Site ◽  
Angle Of Internal Friction ◽  
Geotechnical Characteristics ◽  
Geotechnical Tests

The aim of the present study is to determine the physical and geotechnical characteristics of municipal solid waste (MSW) from an open dump site located in Una town, Himachal Pradesh (India) for the analysis of settlement and structural stability of landfill. Degraded waste was tested for different time intervals ranging from 6 months to 6 years. The physical characterization and the geotechnical tests were performed to determine the composition and the engineering properties of MSW respectively. The presence of moisture content in the fresh waste was 49.5±1.05% but for the degraded (or old) waste it varied between 39.8 to 51.6%. The specific gravity of fresh and old waste varied between 1.83±0.05 and 1.85 for 6 months old waste and 2.28 for 5-6 years old degraded waste respectively. The maximum dry density (MDD) was observed to be 4.28 kN/m2 for fresh waste at the optimum moisture content (OMC) of 78.1% and 4.47 kN/m3 for 6 months old waste and 6.25 kN/m3 for the degraded waste of 5-6 years at 80.2, 85.4% of OMC respectively. The hydraulic conductivity (k) of MSW was found to be decreasing with the degradation of MSW and the overburden pressure whereas the shear strength increased along with the degradation of the waste. The cohesion (c) and angle of internal friction (φ) increased respectively from 31.2 kPa(fresh) to 38 kPa(degraded) and 14° to 22° with the increase in waste degradation. The compression ratio of fresh waste was within the ranges of 0.19-0.29 and for degraded MSW it varied between 0.12 for 6 months old waste and 0.17 for 5-6 years old degraded waste respectively.

scholarly journals Experimental and Numerical Research on Utilizing Modified Silty Clay and Extruded Polystyrene (XPS) Board as the Subgrade Thermal Insulation Layer in a Seasonally Frozen Region, Northeast China

2019 ◽  
Vol 11 (13) ◽  
pp. 3495 ◽  
Author(s):  
Qinglin Li ◽  
Haibin Wei ◽  
Peilei Zhou ◽  
Yangpeng Zhang ◽  
Leilei Han ◽  
...  
Keyword(s):  
Moisture Content ◽  
Thermal Insulation ◽  
Composite Layer ◽  
Solid Particles ◽  
Dry Density ◽  
Silty Clay ◽  
Insulation Property ◽  
Frost Depth ◽  
The Stability ◽  
Thermal Insulation Property

For strengthening sustainability of subgrade life-cycle service performance and storing industry solid wastes in seasonally frozen regions, compared to previous research of modified silty clay (MC) which consisted of oil shale ash (OSA), fly ash (FA), and silty clay (SC), we identified for the first time, the variations in the thermal insulation capability of MC with different levels of dry density and moisture content. Taking into consideration the effects of 0–20 freeze-thaw (F-T) cycles by a laboratory test, and by the numerical simulation of coupling moisture-temperature, while considering the effects of F-T cycles, the thermal insulation capability of the MC board and the XPS board were studied quantitatively. The testing results show that the thermal conductivity of MC and SC gradually decreases as the number of F-T cycles increases, and that of the XPS board increases with the increased number of F-T cycles, and tend to be of a constant value of 0.061 W/m/K after 17 F-T cycles. The specific heat capacity of the solid particles of the MC, SC, and XPS board does not change regularly as their moisture content, and the number of F-T cycles change, and their variations are in the range of the test error (2%). Simulation results show that MC has the advantage of the thermal insulation property to reduce the frost-depth of 0.21 m, and the thermal insulation property of the composite layer consisting of the MC and XPS board is greater to reduce the frost-depth of 0.55 m, so that it can protect both the SC and sand gravel of the experimental road from the frost heave damage. The research methods and results are very significant in accurately evaluating the thermal insulation capacity and the sustainability of MC and the composite layer consisting of the MC and XPS board, strengthening the stability of the subgrade and increasing the availability of industrial waste.

Determination of Elastic and Plastic Subgrade Soil Parameters for Asphalt Cracking and Rutting Prediction

1996 ◽  
Vol 1540 (1) ◽  
pp. 97-104 ◽  
Author(s):  
G. Behzadi ◽  
W. O. Yandell
Keyword(s):  
Moisture Content ◽  
Constitutive Model ◽  
Permanent Deformation ◽  
Triaxial Tests ◽  
Deformation Analysis ◽  
Soil Parameters ◽  
Dry Density ◽  
Silty Clay ◽  
Exponential Relationship ◽  
Deviator Stress

A preliminary step in the prediction of rutting and cracking in a number of accelerated loading facility trials in Australia is presented. The results of laboratory repeated load triaxial tests were used to characterize the residual and resilient deformation of a silty clay subgrade material. The analysis of permanent deformation indicated that the well-known model ∈p = INS can be used to estimate the accumulated strain at any number of loading cycles. The parameter S (the slope of the line in a plot of log ∈p –log N) was found to be independent of stress and density, but very small increases were observed as moisture content increased. The parameter I (the intercept in a plot of log ∈p –log N) was found to be most sensitive to deviator stress. The test results also indicated that I increased with increasing moisture content and decreased as dry density increased. The analysis revealed that an exponential relationship existed between I and deviator stress. This relationship was used to develop a constitutive model for silty clay based on the previously mentioned well-known model. The constitutive model obtained would be able to predict the plastic strain under any number of loads at any specified stress level. Resilient deformation analysis has shown that resilient modulus initially decreased rapidly with increasing deviator stress and then increased slightly or was nearly constant. The elastic and plastic parameters will be used as input for performance predictors such as VESYS and Mechano-Lattice.

Laboratory Investigation on the Strength Characteristics of Cement-Treated Base

2014 ◽  
Vol 507 ◽  
pp. 353-360 ◽  
Author(s):  
Amiruddin Ismail ◽  
Mojtaba Shojaei Baghini ◽  
Mohamed Rehan Karim ◽  
Foad Shokri ◽  
Ramez A. Al-Mansob ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Moisture Content ◽  
Unconfined Compressive Strength ◽  
Resilient Modulus ◽  
Tension Test ◽  
Engineering Properties ◽  
Dry Density ◽  
Flexure Strength ◽  
Indirect Tension ◽  
Indirect Tension Test

Cement-Treated Base (CTB) is a non-conventional method used in road bases materials to improve its engineering properties due to the hardening of cement when moisture is present and extends the period of curing times. This study investigates the effects of cement additive on properties of base layer using laboratory mechanistic evaluation of stabilized soil mixtures. Laboratory tests conducted were Unconfined Compressive Strength (UCS), Indirect Tension test for Resilient Modulus (ITRM) and Flexure Strength (FS) tests. The results revealed that by adding Portland cement, the mechanical properties of the mixture have improved where the UCS is found to be an important quality indicator. In addition, the variables that influenced these tests, which are cement content, curing time, moisture content, and dry density, play important role to determine the performance of CTB. This paper presents the finding of a correlation conducted to analyse the influences of these variables using regression and ANOVA to establish significant models with the aim of predicting the strength base on mixture parameters. Keywords: Cement-Treated Base, Unconfined Compressive Strength, Indirect Tension test for Resilient Modulus, Flexure Strength, Moisture Content, Dry Density, Regression Analysis.

scholarly journals Site characterization for engineering purposes using geophysical and geotechnical techniques

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Aderemi A. Alabi
Keyword(s):  
Moisture Content ◽  
Atterberg Limits ◽  
Dry Density ◽  
Sieve Analysis ◽  
Maximum Dry Density ◽  
Engineering Structures ◽  
Permissible Range ◽  
Low Load ◽  
Electrical Soundings ◽  
Community Area

Abstract Geophysical and geotechnical techniques were applied to determine the suitability of the sub-surface structure of Akole community area, Abeokuta, Nigeria, for the construction of engineering structures (CES). Four vertical electrical soundings (VES) were carried out, and 10 samples from different points at 1 m depth were analysed to determine soil moisture content, specific gravity (SG), Atterberg limits and California bearing ratio (CBR). The geoelectric sections revealed a maximum of five layers with the typical sounding curves of AKH and HKH types. Sieve analysis and tests for compaction limit, Atterberg limits, SG, optimum moisture content and maximum dry density for compaction limit revealed that samples SP2, SP3, SP4, SP6, SP7, SP8, SP9 and SP10 are of low plasticity with SG values that fall within the permissible range, while SP1 and SP5 are of medium plasticity and their SG values fall below the range of standard specifications. CBR analysis showed that SP1 and SP5 have low load-bearing capacities. VES 1 and 2, linked with SP1 and SP5, are considered unstable and unsuitable to support the CES with shallow foundations; however, excavation of weak layers up to a depth of 5 m and reinforcement will enable the support. Določitev primernosti tal za gradnjo inženirskih objektov na območju skupnosti Akole v Nigeriji je bila izvedena s pomočjo uporabe geofizikalnih in geotehničnih metod. Izvedene so bile štiri navpične sondažne geo-električne meritve. Za določitev vlažnosti, specifične teže, konsistenčnih mej in kalifornijskega indeksa nosilnosti (CBR) je bilo preiskanih deset vzorcev tal iz različnih lokacij globine 1 m. Geo-električni prerezi so pokazali maksimalno pet različnih plasti s tipičnimi sondažnimi krivuljami tipa AKH in MKH. Na vzorcih tal z oznakami SP2, SP3, SP4, SP6, SP7, SP8, SP9 in SP10 so bile opravljene sejalna analiza, določitev meje zgoščevanja, določitev konsistenčnih mej, specifična teža, optimalna vlažnost in maksimalna suha gostota za mejo zgoščevanja. Vzorci imajo nizko stopnjo plastičnosti in specifično težo, ki spada v dovoljeno območje. Vzorca tal z oznakami SP1 in SP5 imata srednjo stopnjo plastičnosti in spadata pod območje standardnih zahtev. Preiskava s testom CBR je pokazala, da imata vzorca tal SP1 in SP5 nizko nosilnost na obtežbo. Preiskavi VES 1 in 2 sta prav tako pokazali, da sta vzorca SP1 in SP5 nestabilna ter neprimerna za temeljenje pri gradnji inženirskih objektov s plitvim temeljenjem, čeprav bi z odstranitvijo plasti globine do 5 m in armiranjem dosegli primerno nosilnost za temeljenje.

scholarly journals Characterization of the High Swelling Green Clay in the Vicinity of Amman Area

2021 ◽  
Vol 15 (1) ◽  
pp. 360-369
Author(s):  
Monther Abdel Hadi ◽  
Ibrahim Khliefat ◽  
Nafeth Abdelhadi ◽  
Nidhal Saada
Keyword(s):  
Moisture Content ◽  
Clay Mineral ◽  
Initial Moisture Content ◽  
Swelling Pressure ◽  
Liquid Limit ◽  
Engineering Properties ◽  
Dry Density ◽  
Initial Water Content ◽  
Foundation Design ◽  
Green Clay

Introduction: Jordan is awarded huge areas in the north and western part of the country in which brown and green clay is dominant. This research focuses on the problems and behaviour of the green clay only. The main problem of the green clay is its high swelling pressure which is the main cause of excessive settlement and wall cracks in buildings, especially during the wet season. Methods: This study aims to investigate the engineering properties and behaviour of the green clay deposits in the Amman area, which will serve as a guide for both geotechnical and structural engineers when preparing the foundation design. Results: Based on the consolidation test, the investigated green clay showed high swelling pressure of 3.11 kg/cm2, liquid limit (LL) of 73%, plasticity index (PI) of 40%, the shrinkage limit (SL) of 12%, and liquidity index (LI) of 0.125. The moisture content at saturation is 35.14%, while the natural moisture content is 28%, dry density is 1407 kg/m3, cohesion (C) is 0.20 kg/cm2 and unconfined compressive strength is 1.05 kg/cm2. The XRD results of the clay size fraction have confirmed the presence of the expansive clay mineral smectite as the essential clay mineral together with kaolinite. Results provide a general understanding of the behaviour and properties of the green clay, and the regression analysis showed good correlations between the liquid limit and initial moisture content with the compression index and also between the initial void ratios with the swelling index. Conclusion: Changes in the volume are due to the unsaturation level of clay when provided with initial water content.

scholarly journals Characterisation of Lateritic Soil from Selected Locations along Ibadan – Oyo Expressway for Highway Pavement Construction

2018 ◽  
Vol 1 (March 2018) ◽  
Author(s):  
O.M Osuolale ◽  
A.A Raheem ◽  
J.R Oluremi ◽  
A.K Adeosun
Keyword(s):  
Liquid Limit ◽  
West African ◽  
Engineering Properties ◽  
Lateritic Soil ◽  
Dry Density ◽  
Sieve Analysis ◽  
Maximum Dry Density ◽  
Base Course ◽  
Pavement Construction ◽  
Highway Pavement

A good understanding of the engineering properties of lateritic soil is highly essential for effective use of the soil for highway pavement construction. The alarming rate of highway pavement failures within the study area has been attributed to paucity of information on the properties of the soil within the study zone. Therefore, the lateritic soils along selected locations along Ibadan – Oyo were characterised for their suitability for highway construction. Ten (10) lateritic soil samples were collected and they were labelled Trial Pit (TP) 1 to 10. The samples were subjected to the following laboratory tests: Sieve analysis, Liquid Limit (LL), Plastic Limit (PL), and Shrinkage Limit (SL), British Standard (BS), West African Standard (WAS), Modified AASHTO compaction and California bearing ratio. The samples were classified using AASHTO classification system. The results of the sieve analyses for percentage passing the 75 m ranged from 15.6 – 33.7%, LL, PL and SL ranged from 30.1 – 39.2%, 2.6 – 23.1%, and 2.1 – 9.3%, respectively. The maximum dry density (MDD) and optimum moisture content (OMC) for British, West African and Modified AASHTO compaction ranged from (1.48 – 1.94 g/cm’ and 10.40 – 16.40%), (1.69 – 2.40 g/cm’ and 9.60-14.40%) and (1.79 – 2.60 g/cm’ and 6.60- 11.60%), respectively. The ten samples are classified as A-2-6 soil. Based on the characterisation, all the samples are only suitable for fill and subgrade except sample TP2 that is also suitable for subbase and base course construction in highway pavement.

scholarly journals Geotechnical Assessment of Pavement Failure along Lagos-Ibadan Expressway

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Simeon O Odunfa ◽  
Adebayo O. Owolabi ◽  
Peter O. Aiyedun ◽  
Obanisola M. Sadiq
Keyword(s):  
Moisture Content ◽  
High Water ◽  
Linear Shrinkage ◽  
Dry Density ◽  
Maximum Dry Density ◽  
Geotechnical Parameters ◽  
The Road ◽  
Natural Moisture Content ◽  
Geotechnical Assessment ◽  
Shrinkage And Swelling

Pavement failure has contributed immensely to loss of lives, disruption to normal daily activities and increase amount of money being spent on maintenance annually. One of the causes is associated with inadequate investigations on subgrade materials. This study aimed at examining the geotechnical parameters as factors of pavement failure along Lagos–Ibadan Expressway. Samples were collected at the failed and stable portions on some selected road segments and subjected to laboratory tests including Natural Moisture Content (NMC), Linear Shrinkage(LS), particle size distribution and California Bearing Ratio(CBR). The NMC along the failed sections was on the high side (ranged from 13.11% to 26.89%) compared with the stable sections (ranged from 11.11% to 16.40%). Most of the tested soils have percentage passing 0.075mm sieve more than 35% maximum required by the Federal Ministry of Works and Housing for subgrade materials. The maximum dry density(MDD) for the samples at failed and stable sections ranged from 1550 kg/m3 to 1860 kg/m3; 1650 kg/m3 to 1980 kg/m3 respectively while the Optimum Moisture Content(OMC) ranged from 8.30% to 20.30%. The soaked CBR values ranged from 2% to 17% while the unsoaked values ranged from 4% to 25%. The increase in NMC along the failed portions could be as a result of high water table along these sections. Some of the materials at failed locations had values of LS > 8% which suggests high susceptibility to shrinkage and swelling which results in differential settlement and contributed to pavement failure along these sections of the road. Keywords: Geotechnical, Pavement failures, subsurface investigations, Expressway, subgrade materials.

scholarly journals Layered Grouting Technology Based on a Comprehensive Water-to-Cement Ratio for the Overlying Loess Stratum of Urban Shallow Tunnels

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Teng Yang ◽  
Jiaqi Zhang ◽  
Xiao Zhang ◽  
Qingsong Zhang ◽  
Zhanchao Yin
Keyword(s):  
Compressive Strength ◽  
Moisture Content ◽  
Strain Curve ◽  
Test System ◽  
Engineering Properties ◽  
Dry Density ◽  
Road Tunnel ◽  
Cement Ratio ◽  
Grouting Pressure ◽  
Water To Cement Ratio

Different from sand and clay, loess has special engineering properties; hence, existing soil grouting theories are not suitable for the disaster treatment of shallow loess tunnels. In this study, a fine grouting reinforcement test system was developed, and the Yuhan Road tunnel overlying loess was used as the injection medium. An orthogonal test based on slurry dry density, moisture content, water-to-cement ratio, and grouting pressure was conducted. Results revealed that the loess samples have high integrity after grouting, and the cohesion and compressive strength improved significantly. The stress-strain curve showed that the strengthened samples have greater ultimate and residual strengths than samples before grouting. Through a range analysis, it was determined that water-to-cement ratio and moisture content are the main factors affecting loess cohesion and compressive strength. Therefore, a comprehensive test of the water-to-cement ratio and moisture content as a single variable was conducted. It was found that their influence on loess cohesion and compressive strength is not a single linear relationship but a combined balance. To characterize the joint effect of water in loess and in slurry on reinforcement, the concept of a comprehensive water-to-cement ratio is proposed, and the cohesion and compressive strength curves with respect to this ratio were drawn. An optimal comprehensive water-to-cement ratio, which corresponds to the maximum cohesion or compressive strength, was found. Based on this ratio, we further propose a method to calculate the water-to-cement ratio of slurry and suitable grouting amount for the Yuhan Road tunnel reinforcement project, in which all solution parameters can be measured via field tests. In the project, a surface layered grouting scheme, based on the optimal comprehensive water-to-cement ratio, was designed. After grouting, loess strength was improved significantly, permeability was reduced greatly, and the overall reinforcement effect was suitable; these results provide a reference for similar projects.

scholarly journals Effect of Municipal Solid Waste Disposal on the Engineering Properties of Soil from a Non-Engineered Landfill

2019 ◽  
Vol 8 (12) ◽  
pp. 2378-2388
Keyword(s):  
Moisture Content ◽  
Contaminated Soil ◽  
Engineering Properties ◽  
Natural Soil ◽  
Dry Density ◽  
Solid Waste Disposal ◽  
Dump Site ◽  
Settlement Analysis ◽  
Engineered Landfill ◽  
Waste Soil

The presents study showed the effect of open dumping on soil characteristics and biodegradation settlement analysis of soil in non-engineered landfill. The contaminated soil is referred to as waste soil which has different settlement rates due to the various categories and complex characteristics of waste. The degradation of waste causing percolation of leachate into soil affecting the strength and stability of soil. This paper includes the analysis of geotechnical properties and settlement analysis of waste soil and its comparison was done with natural soil. The geochemical analysis was carried out by Energy Dispersive X- Ray Spectroscopy (EDX) and Scanning Electron Microscopy (SEM). The elemental analysis of soil exhibited presence of high oxygen and silica content in uncontaminated soil. The analysis depicted that specific gravity, maximum dry density (MDD), permeability and California bearing ratio (CBR) showed decreasing trend variation for polluted soil. It was observed that cohesion for contaminated soil was found to be increased thereby increasing the shear strength of soil. Additionally, temperature, pH and moisture content hold a significant position for assessing the settlement. The settlement of soil due to biodegradation of MSW is estimated using empirical mathematical model for dump site depending upon pH, moisture content and temperature. Additionally, settlement is evaluated keeping in view the settlement due to biodegradation of MSW on soil, which further helped in determination of the suitability of the site for the construction and other recreational purposes.

Sign in / Sign up

Export Citation Format

Share Document