Behaviour of compacted fine-grained soil in a brine environment

1984 ◽  
Vol 11 (2) ◽  
pp. 196-203 ◽  
Author(s):  
K. J. D. Ridley ◽  
J. K. Bewtra ◽  
J. A. McCorquodale
Keyword(s):  
Hydraulic Conductivity ◽  
Clay Mineral ◽  
Clay Content ◽  
Montmorillonite Clay ◽  
Engineering Properties ◽  
Solution Composition ◽  
Fine Grained ◽  
Fine Grained Soil ◽  
Brine Environment

The hydraulic conductivity and engineering properties of compacted fine-grained soils change with time when exposed to a 30% NaCl brine environment. The hydraulic conductivity of brine was found to be greater than that of water in soils where the dominant clay mineral was montmorillonite, whereas a soil rich in illite and kaolinite was virtually insensitive to variations in solution composition. Increases in brine hydraulic conductivities were most pronounced in soils high in montmorillonite where sodium was the dominant adsorbed ion. They demonstrated the most labile hydraulic conductivities. Fine-grained soils, high in montmorillonite clay content, were prone to alteration in engineering properties when soaked in a 30% NaCl brine. However, brine soaking had little effect on soils rich in illite–kaolinite.

scholarly journals Remediation of Clayey Soil Using Silica Fume

2018 ◽  
Vol 162 ◽  
pp. 01017
Author(s):  
Kawther Al-Soudany
Keyword(s):  
Silica Fume ◽  
Clayey Soil ◽  
Liquid Limit ◽  
Engineering Properties ◽  
Unit Weight ◽  
Clay Material ◽  
Fine Grained ◽  
Pozzolanic Reactivity ◽  
Fine Grained Soil ◽  
Swell Pressure

This paper evaluates the use of silica fumes as modification of fine-grained soil in order to alter undesirable properties of the native soil and create new useful soils. Silica fume as well as clay material, are used in changing the engineering properties to be compatible and satisfying this is due to their pozzolanic reactivity. The study aims to investigate the uses of these materials in geotechnical engineering and to improve the properties of soils. Four percentages of silica fumes were used in the present study, which is 0, 3, 5 and 7%. Classification, specific gravity, compaction characteristics, swell and swell pressure, CBR and compressive strength tests had been conducted on the prepared and modified soils. Results clarified that the silica fume increasing leads to decrease the plasticity index and liquid limit. Increasing in silica fume causes an increasing in plastic limit and optimum water contents while the maximum dry unit weight values decrease. The compressive shear strength, California Bearing Ratio (CBR), swell and swell pressure is improved by using silica fume so that silica fume can be considered as a successful material in improving the soil properties.

scholarly journals Influence of Waste Toothbrush Fiber on Strength and Freezing–Thawing Behavior in High Plasticity Clay

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Fatih Isik ◽  
R. Kagan Akbulut ◽  
A. Sahin Zaimoglu
Keyword(s):  
Clayey Soil ◽  
Polypropylene Fiber ◽  
Engineering Properties ◽  
Waste Materials ◽  
High Plasticity ◽  
Fine Grained ◽  
Reinforcement Material ◽  
Fine Grained Soil ◽  
High Plasticity Clay ◽  
Waste Polypropylene

AbstractThe use of waste materials in civil engineering applications has gained importance nowadays. Consuming limited natural resources and increasing waste disposal costs have led researchers to evaluate waste materials for different geotechnical applications. In this respect, some waste materials are used as reinforcement in soils to improve their engineering properties. The main objective of this paper was to investigate the usability of waste polypropylene fiber as a reinforcement material in high plasticity fine-grained soils. For this purpose, waste toothbrush bristle (WTB) was used as a polypropylene fiber reinforcement material and added to fine-grained soil at ratios of 0.2%, 0.4%, 0.6% and 0.8% by dry total weight. The effect of WTB on freezing–thawing behavior and unconfined compression strength of unreinforced and reinforced clayey soil was evaluated. The results indicated that addition of WTB to high plasticity clay improved its behavior against freezing–thawing. Also, undrained shear strength increases with respect to increment in WTB ratio.

scholarly journals Geotechnical Properties of Wood Ash-Based Composite Fine-Grained Soil

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Bayshakhi Deb Nath ◽  
Grytan Sarkar ◽  
Sumi Siddiqua ◽  
Md. Rokunuzzaman ◽  
Md. Rafiqul Islam
Keyword(s):  
Soft Clay ◽  
Wood Ash ◽  
Engineering Properties ◽  
Electricity Production ◽  
Fine Grained ◽  
Pozzolanic Material ◽  
Fine Grained Soil ◽  
Solid Biomass ◽  
Test Result ◽  
Compressibility Characteristics

It is observed in Bangladesh that there is an extensive use of wood as a solid biomass for heat and electricity production, which led to increase in the amount of combustion residues known as ash. These ashes are discarded and dumped here and there, resulting in pollution of the environment. It could be managed by using wood ash as a stabilizer of soft clay. It is found that there is an enhancement of the engineering properties of existing soil in stabilized forms particularly unconfined compressive strength (UCS), shear strength parameters, workability, and compaction and compressibility characteristics. Therefore, laboratory tests associated with these properties were performed for some selected percentage of wood ash, for example, 0%, 5%, 7.5%, 10%, and 12.5%. Chemical investigation of wood ash depicts that it contains approximately 30% CaO, which directs it to behave like a pozzolanic material. Besides, the test result signifying that the soil could be made lighter with the increase of moisture content, strength, and reduction of compressibility due to the addition of ash content.

scholarly journals An Experiment on Incorporation of Bentonite Clay in Mortar

2020 ◽  
Vol 8 (5) ◽  
pp. 3866-3873
Keyword(s):  
Clay Mineral ◽  
Chemical Weathering ◽  
Shear Failure ◽  
Bentonite Clay ◽  
Stone Masonry ◽  
Major Constituent ◽  
Fine Aggregate ◽  
Fine Grained ◽  
Fine Grained Soil ◽  
Fixed Proportion

Mortar refers to a binding paste which is workable in nature and consistency, used as a binder in construction activities such as stone bonding in stone masonry, brick bonding in brick masonry and as well as in concrete works. Mortar is often used as a means for decorative works attaining to its workable nature, which in this project I have intended to enhance. Mortar is further used as a sealant in order to fill cracks and gaps within the structure. The term mortar is taken from the Latin term “ mortarium” which means crushed. Mortar is often prepared by mixing a suitable binder, fine aggregate or in simpler terms sand and water by a fixed proportion by mass or volume. The ratio of the constituents depends on the quality and magnitude of the work being done. Mortar gains its strength due to the various chemical reactions that occur while the mortar is being cured in water, gaining 99% strength in 28 days. The most used binder in modern times is Portland cement, which was used at the onset of 20th century. A common binder prevailing in the past was lime and the associated mortar mix was called lime mortar. A major part of this project lies in the use of clay as a substitute for sand in mortar. Clay refers to a fine-grained soil deriving its origin from naturally occurring rocks that have undergone chemical weathering. Clay mineral can be classified into three types i.e. Kaolinite, montmorillonite and illite. The type of clay that has been used in this experiment is Bentonite which is a volcanic in origin and has montmorillonite as a major constituent. Clay has water entrapped within its structure and the amount of water depends on the type of clay mineral being dealt with. One of the major properties of clay that I have tried to exploit in this project is its plastic nature i.e. the ability of the soil to gain resistance against shear failure by sliding as they get into a dry state as opposed to possessing very little or no resistance to the same when they absorb water. Attaining help of various properties of clay, in this project I will try to evaluate the various properties of a mortar cube by mixing a fixed proportion by mass of clay in the same and present my observations

scholarly journals Experimental Study on Soil Stabilization Using Fibres

2021 ◽  
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Soil Stabilization ◽  
Soft Soil ◽  
Soil Samples ◽  
Engineering Properties ◽  
Soil Tests ◽  
Fine Grained ◽  
Fine Grained Soil ◽  
Materials Used

Abstract. For pavement constructions such as runway and highway construction, fine-grained soils are not suitable because of their undesirable properties such as grading of particle size, low bearing capacity, and more plasticity, and its ability to swell. To improve these soil properties various soil stabilization methods are needed. The stabilization is done by adding various stabilizing materials with the fine-grained soil. Fibres are one of the materials used in soil stabilization. This experimental study has been carried over to improve the bearing capacity of soft soil (from Sholinganallur, Chennai) by using Natural and Artificial fibres. During this study, the soil samples which has been stabilized with various fibres was prepared i.e., soil with Natural fibres (jute fibre) and soil with artificial fibres. In this experimental study, index properties and engineering properties of soft soil or unreinforced samples and stabilized soil samples with fibres are determined. Samples are subjected to various soil tests which have been used to determine the engineering properties of soil. The soil tests such as the standard proctor compaction test, unsoaked California Bearing Ratio (CBR) test, and Unconfined Compression (UCC) test had been done to determine the characteristics of the samples. To determine the properties of the reinforced materials, the fibres also have undergone various geosynthetic laboratory tests. The results of the study show that the bearing capacity of Shollinganallur fine-grained soil can be improved subsequently and water absorption by soil has been reduced significantly by using fibres.

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