Research on the Impact of Moisture Content on the CBR Value of Shanxi Loess

2013 ◽  
Vol 838-841 ◽  
pp. 80-83
Author(s):  
Xi Rong Wu ◽  
Jun Ming Shen
Keyword(s):  
Moisture Content ◽  
Water Content ◽  
Laboratory Experiments ◽  
Orthogonal Experiment ◽  
Optimum Moisture Content ◽  
Soil Samples ◽  
Shanxi Province ◽  
Sample Category ◽  
The Impact ◽  
Typical Soil

Several typical soil samples in Shanxi Province were selected. Laboratory experiments were adopted to study the CBR of the three kinds of soil samples with different compaction and different water content. Orthogonal experiment was used to analyze the impact of factors including water content, compaction and soil sample category on the CBR value. The result shows that the moisture content has great impact on CBR value and the CBR value is maximize under optimum moisture content and maximum degree of compaction condition, while the not flooded CBR is decrease with the increasing of water content.

Analysis of the Influence of Water Content on Shanxi Loess CBR and Rebound Module

2014 ◽  
Vol 919-921 ◽  
pp. 820-823
Author(s):  
Xi Rong Wu ◽  
Li Li Zhu
Keyword(s):  
Moisture Content ◽  
Water Content ◽  
Resilient Modulus ◽  
Test Methods ◽  
Shanxi Province ◽  
Influence Of Water ◽  
The Times ◽  
Relationship Of ◽  
The Impact ◽  
The Relationship

Selection of five typical loess in Shanxi Province, the paper adopt the indoor test methods to prepares the different compaction and different moisture content specimens which were used to test CBR value and rebound module, analyzes the impact of compactness and moisture content on the CBR value and resilient modulus and establishes the relationship of CBR and moisture content. The result shows that the level of moisture content has great impact on CBR value and rebound module. The CBR value is maximal under optimum moisture content and maximum degree of compaction condition. The times of compaction have little effect on the improvement of CBR with increasing water content. The relationship of the soaking CBR,resilient modulus and the moisture content shows a certain regularity.Key words: Loess filler;the CBR;resilient modulus;compactness;moisture content;relationship

scholarly journals An empirical model for describing the influence of water content and concentration of sulfamethoxazole (antibiotic) in soil on the total net CO2 efflux

2020 ◽  
Vol 68 (4) ◽  
pp. 351-358
Author(s):  
Miroslav Fér ◽  
Radka Kodešová ◽  
Barbora Kalkušová ◽  
Aleš Klement ◽  
Antonín Nikodem
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Solution Treatment ◽  
Soil Microbial Activity ◽  
Soil Samples ◽  
Co2 Efflux ◽  
The Impact ◽  
Water Contents ◽  
Soil Water Contents

AbstractThe aim of the study was to describe the impact of the soil water content and sulfamethoxazole, SUL, (antibiotic) concentration in soil on the net CO2 efflux. Soil samples were taken from topsoils of a Haplic Fluvisol and Haplic Chernozem. Soil samples were packed into the steel cylinders. The net CO2 efflux was measured from these soil columns after application of fresh water or SUL solution at different soil water contents. The experiments were carried out in dark at 20°C. The trends in the net CO2 efflux varied for different treatments. While initially high values for water treatment exponentially decreased in time, values for solution treatment increased during the first 250–650 minutes and then decreased. The total net CO2 effluxes measured for 20 hours related to the soil water content followed the second order polynomial functions. The maximal values were measured for the soil water content of 0.15 cm3 cm−3 (Haplic Fluvisol with water or solution, Haplic Chernozem with solution) and 0.11 cm3 cm−3 (Haplic Chernozem with water). The ratios between values measured for solution and water at the same soil water contents exponentially increased with increasing SUL concentration in soils. This proved the increasing stimulative influence of SUL on soil microbial activity.

scholarly journals Engineering behaviour of stabilized laterite and kaolin using lignin

2018 ◽  
Vol 250 ◽  
pp. 01008
Author(s):  
Tuan Noor Hasanah Tuan Ismail ◽  
Siti Aimi Nadia Mohd Yusoff ◽  
Ismail Bakar ◽  
Devapriya Chitral Wijeyesekera ◽  
Adnan Zainorabidin ◽  
...  
Keyword(s):  
Moisture Content ◽  
Unconfined Compressive Strength ◽  
Laboratory Tests ◽  
Dry Weight ◽  
Optimum Moisture Content ◽  
Soil Samples ◽  
Dry Density ◽  
Laterite Soil ◽  
Maximum Dry Density ◽  
Steady Rate

Soils at many sites do not always have enough strength to bear the structures constructed over them and some of the soil may need to be stabilized in order to improve their geotechnical properties. In this paper, routine laboratory tests were critically carried out to investigate the efficacy of lignin in improving the strength behaviour of the soils. Two different soil samples (laterite and kaolin) were studied and mixed with different proportions of lignin (2% and 5% of dry weight of soil), respectively. Unconfined Compressive Strength (UCS) characteristics evaluated in this study were done on samples at their maximum dry density and optimum moisture content (obtained from compaction tests). The UCS tests on all the specimens were carried out after 0, 7, 15, 21 and 30 days of controlled curing. The research results showed that the addition of lignin into kaolin reduced its maximum dry density while giving progressively higher optimum moisture content. Contrarily, with the laterite soil, both maximum dry density and optimum moisture content simultaneously increased when lignin was added into the soils. The UCS results showed that the the stabilized laterite with 2% lignin continued to gain strength significantly at a fairly steady rate after 7 days. Unfortunately, lignin did not show a significant effect in kaolin.

The Experiment Study on Parameters of Duncan-Chang Model for Silt Based on Different Water Content

2014 ◽  
Vol 665 ◽  
pp. 213-216
Author(s):  
Xun Zhong Zhang ◽  
Ru Heng Wang ◽  
Bin Jia
Keyword(s):  
Moisture Content ◽  
Water Content ◽  
Triaxial Test ◽  
Nonlinear Behavior ◽  
Optimum Moisture Content ◽  
Experiment Study ◽  
Optimal State ◽  
Test Parameters ◽  
Key Factor ◽  
Chang Model

Duncan-Chang model can reflect soil’s nonlinear behavior much better, its’ concept is clear and easy to understand. In this paper, through triaxial test, parameters of Duncan-Chang model were gained by analyzing characteristics of Silt’s stress-strain Cures. A key factor, effecting silt’s stability, is the moisture content; there is a optimum moisture content in silt, in this moisture content, silt’s parameters of Duncan-Chang model can reach to the optimal state.

Evaluation of Lime Treated Oil Contaminated Soils for Use in Waste Containment Applications

2013 ◽  
Vol 824 ◽  
pp. 66-72
Author(s):  
Thomas Stephen Ijimdiya
Keyword(s):  
Hydraulic Conductivity ◽  
Moisture Content ◽  
Contaminated Soils ◽  
Optimum Moisture Content ◽  
Soil Samples ◽  
Liner Material ◽  
British Standard ◽  
Waste Containment ◽  
Relative Compaction ◽  
Waste Containment Systems

This paper presents the results of an evaluation of lime treated oil contaminated soil for use in waste containment systems. Soil samples were treated with up 6 % lime contents. Specimens were prepared at optimum moisture content and compacted using British Standard Light (BSL) or Standard Proctor (relative compaction = 100%) to evaluate its effectiveness when used in waste containment applications. The hydraulic conductivity values increased with higher lime contents but were less than 1 x 10-9 m/s required for a liner material.

scholarly journals Influence of admixture of Bamboo leaf ash and lime on the Compaction characteristics of lateritic soil

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
I. O Ameen
Keyword(s):  
Moisture Content ◽  
Soil Sample ◽  
Optimum Moisture Content ◽  
Lateritic Soil ◽  
Dry Density ◽  
Maximum Dry Density ◽  
British Standard ◽  
Bamboo Leaf Ash ◽  
The Impact ◽  
Sample Maximum

This study investigated the impact of compactive efforts on A-7-5 lateritic soil stabilized with Bamboo Leaf Ash (BLA) mixed with lime. Preliminary tests were conducted on the soil sample for identification and classification. Compaction tests (using British Standard Light (BSL), British Standard Heavy (BSH) and West Africa Standard (WAS) compactive efforts) were performed on the sample in both natural and stabilized states by incorporating 2, 4, 6 and 8% Bamboo Leaf Ash mixed together with 1, 2, and 3% lime by weight of soil sample. Maximum dry density (MDD) increased to 1766 kg/m3 at 3% lime and 6% BLA, 1818 kg/m3 at 3% lime and 8% BLA and 1866 kg/m3 at 3% lime and 2% BLA while the optimum moisture content decreased to 12.70% at 3% and lime 8% BLA, 11.40% at 2% lime 6% BLA and 11.12% at 3% lime and 2% BLA for BSL, WAS and BSH, respectively. Based on these findings, the addition of lime-BLA enhanced the soil and has a promising prospect for stabilization of lateritic soil.

Assessment of Gneiss-Derived Residual Soils as Materials Used in Road Pavement Structures

2020 ◽  
Vol 3 ◽  
pp. 12-25
Author(s):  
Olaoluwa Oluwaniyi ◽  
Imoleayo Fatoyinbo ◽  
Akinola Bello ◽  
Joshua Owoseni
Keyword(s):  
Moisture Content ◽  
Linear Shrinkage ◽  
Optimum Moisture Content ◽  
Soil Samples ◽  
Dry Density ◽  
Residual Soils ◽  
Maximum Dry Density ◽  
Road Pavement ◽  
Natural Moisture Content ◽  
Pavement Structures

Failure of highway pavement and collapse of building in basement complex of Nigeria is often related to the instability of the residual. This study evaluated the strength characteristics of gneiss-derived residual Soils as materials usable for road pavement structures. A total of eleven soil samples derived from granite gneiss were subjected to laboratory geotechnical analyses based on standard practices. The geotechnical analyses reveal the soils’ natural moisture content, specific gravity, grain sizes, consistency limits, shearing strengths, maximum dry density, and optimum moisture content. Based on AASHTO classification, the soil samples are classified as A-7-6, A-6, and A-7-5. The results of the laboratory analyses revealed that the natural moisture content and specific gravity ranged from 8.30 to 22.70% and 2.6 to 2.8 respectively. Particle size analysis reveals that the coarse contents of the soils ranged from 28.8% to 59.8% and amount of fines ranged from 40.2 to 71.2%. The liquid limit ranged from 31.3% to 68.3%, plastic limit ranged from 20% to 28.0%, plasticity index ranged from 4.8% to 38.90% and linear shrinkage ranged from 5.7 to 13.6%. The maximum dry density ranged from 1481 kg/m3 to 1921 kg/m3 and optimum moisture content ranged from 15.2% to 27.6%. Undrained triaxial shear strength (Cu) ranged from 43.0 Kpa to 250.3Kpa, angle of friction ranges from 11.7 to 29.30, and unconfined compressive strength ranged from 153 to 356.5Kpa. The results indicate that the residual soils are poor sub-grade and foundation materials due to their high amount of fines, linear shrinkage values, plasticity, and swelling potential, as well as low maximum dry density.

Effect of Glass Fiber on Shear Strength of Soil

2018 ◽  
Vol 775 ◽  
pp. 603-609
Author(s):  
Himadri Shekhar Saha ◽  
Debjit Bhowmik
Keyword(s):  
Shear Strength ◽  
Internal Friction ◽  
Moisture Content ◽  
Glass Fiber ◽  
Water Content ◽  
Soil Samples ◽  
Fiber Content ◽  
Triaxial Tests ◽  
Angle Of Internal Friction ◽  
Increase With Increase

This paper investigates the effect of glass fiber reinforcement on the shear strength properties of the sand clay mixture. The soil samples were prepared by mixing 50% of locally available Barak river sand with 50% of local clay soil. Triaxial tests were conducted on the soil samples containing five different percentage of fiber to know the effect of fiber content on the shear strength of the soil. Unconsolidated Undrained (UU) Triaxial tests were conducted under three different confining pressures for each sample. Samples were prepared with five different values of moisture content considering 2% less than OMC (Optimum Moisture Content), 1% less than OMC, OMC, 1% more than OMC, and 2% more than OMC to study the effect of water content (w) on behavior of fiber reinforced soil. A parametric study has been carried out in this paper to know the effect of different influencing parameters on the cohesion value and angle of internal friction. The results show that the failure stress and angle of internal friction increase with increase in fiber content up to an optimum value then decrease. On the other hand, the cohesion value increases consistently with increase in fiber content. The study also indicates that the peak deviator stress, angle of internal friction and cohesion values increase with increase in water content up to an optimum value which is less than OMC then decrease with further increase in water content.

Study on Transforming from Vegetable-Residue to Roughage

2013 ◽  
Vol 726-731 ◽  
pp. 2970-2974
Author(s):  
Fu Min Yang ◽  
Min Yang ◽  
Ke Ping Zhang
Keyword(s):  
Moisture Content ◽  
Water Content ◽  
Orthogonal Experiment ◽  
Research Focus ◽  
Rice Hulls ◽  
Corn Protein ◽  
Experiment Method ◽  
Orthogonal Experiment Method ◽  
Addition Amount ◽  
Strong Seasonality

The use rate of the vegetable-residue is low which pollution-free processing does not reach the designated position. In order to resolve the problem of vegetable residues treatment, the research focus on transforming from vegetable-residue to feed for livestock and poultry combining with its characteristics of big water content and strong seasonality. Firstly, the vegetable cakes with about 45% moisture content were made of vegetable-residue by cleaning, beating, pressure filtration, batching, mixing, granulating, cooling and packaging. The orthogonal experiment method was used to optimize the addition amount of bentonite, wheat middling, powdered rice hulls, binder and corn protein powder into vegetables particle roughage of poultry and vegetables honeycomb roughage of livestock from vegetable cakes which selected the forming ratio as the indicator. The results showed that when the addition amount of bentonite was 20%, wheat middling was 20%, powdered rice hulls was 20%, corn protein powder was 5%, the vegetables particle roughage had the best forming ratio, while the addition amount of bentonite 12.5%, wheat middling 10%, powdered rice hulls 15%, corn protein powder 3%, binder 2%, the livestock vegetables honeycomb roughage had the best forming ratio. The results would provide the references for vegetable-residue industrial treatment.

Static Compaction of Soils with Varying Clay Content

2015 ◽  
Vol 668 ◽  
pp. 238-246 ◽  
Author(s):  
Alexandr Zhemchuzhnikov ◽  
Khosrow Ghavami ◽  
Michéle dal Toé Casagrande
Keyword(s):  
Moisture Content ◽  
Water Content ◽  
Clay Content ◽  
Optimum Moisture Content ◽  
Testing Procedures ◽  
Compressed Earth Blocks ◽  
Proctor Test ◽  
Earth Blocks ◽  
Standard Proctor Test ◽  
Static Compaction

The use of compressed earth blocks (CEBs) is widespread in the field of earth construction. They present better mechanical performance than adobe and the equipment for their production is simple. Laboratory testing of compressed earth blocks requires large amounts of material. There are variations of unconfined strength testing procedures such as testing halves of the blocks with layers of mortar between them or testing whole blocks in diverse directions. This complicates the interpretation of test results as the shape factor and mortar characteristics influence the results significantly. Static compaction test can be used to produce cylindrical samples representative of CEBs. The water content of soil used for the production of CEBs is often determined in standard Proctor test while experimental data indicate that the optimum moisture content for static and dynamic compaction is different. The present article addresses the behavior of four soil mixes with varying clay content compacted statically with a constant rate of strain. Static compaction curves were compared with those obtained in standard Proctor test. For all the soil mixes the static optimum moisture content was found to correspond to the start of consolidation. The compaction curve presented no wet side of optimum in contrast to Proctor test. The energy needed to achieve a desired density by static compaction was analyzed for soils with varying clay contents. Static compaction was found to be more efficient than dynamic for clayey soils. An increase in water content was observed to help achieving higher densities at low pressures, which can improve the performance of manual CEB presses.

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