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Book ChapterDOI

Swelling and shrinkage behaviour of expansive soil blended with lime and fibres

TL;DR: In this paper, the authors used polymeric fibres to stabilize the soil as well as to improve the strength of the expansive soils and found that 2% fibres and 15% lime together in expansive soils is more effective in controlling the swelling and shrinkage behaviour.
Abstract: Expansive soils are considered to be highly problematic because of their capacity to significant volume change. They swell during the rainy season as they absorb water and shrink when water evaporates from them during the summer season. Because of this dual swell-shrink behaviour, an expansive soil causes severe distress to many civil engineering structures. Several mitigating techniques are adopted to counteract the problems posed by the expansive soils, either by modifying the properties of the soil by adopting stabilization techniques using lime, cement, fly ash, calcium chloride etc. or by adopting special foundation technique such as construction of belled piers, under-reamed piles, etc. In recent years polymeric fibres have also been used to stabilize the soil as well as to improve the strength of the expansive soils. Hence in the present study lime and fibres have been used in different proportions to study the swelling and shrinkage behavior of expansive soils. Swell tests were performed by varying the fibre content and lime with expansive soils. Tests were also conducted by blending fibres and lime together with expansive soils. In a similar way, shrinkage tests were also performed for the various proportions. The test result show that swelling tends to decrease slightly with an increase in the fibre content, whereas shrinkage tends to decrease significantly upon addition of fibres. Both swelling and shrinkage tends to decrease significantly with increasing lime content. The optimum content of fibre was found to be 2%. So the expansive soil specimens blended with 2% fibres and with varying lime content was tested. It is found that blending 2% fibres and 15% lime together in expansive soils is considered to be more effective in controlling the swelling and shrinkage behaviour.
Citations
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Journal ArticleDOI
TL;DR: In this article, the effect of quarry dust based geopolymer cement (QDbGPC) and crushed waste glasses (CWG) on the triaxial and density characteristics of expansive test soil was investigated under laboratory conditions.
Abstract: The effect of quarry dust based geopolymer cement (QDbGPC) and crushed waste glasses (CWG) on the triaxial and density characteristics of expansive test soil was investigated under laboratory conditions. Quarry dust is a solid waste the management of which poses a big problem to construction and environmental experts. So also is the management of waste glasses. Then again, the use conventional cement poses everyday threat to the environment as its utilization releases huge amount of CO2 to the environment thereby causing increased global warming. However, the utilization of quarry dust in the synthesis of geopolymer cements which is an eco-friendly geomaterial and by extension its use in the soil treatment protocol is the aim of this work. The test soil was observed to be a poorly graded A-2-6 soil according to USCS and AASHTO classification systems respectively. The treatment exercise showed that the shear characteristics of the treated soil improved consistently. The poisson ratio, porosity and submerged density improved with increased additives. The stress-strain relationship improved to a very stiff consistency which satisfies the requirements for subgrade and subbase materials in pavement construction. Finally, the utilization of QDbGPC proved to be a good replacement for conventional cement in terms of environmental issues resulting from CO2 emission, resistant to moisture, heat, sulphate attacks, etc on hydraulically bound materials.

23 citations

Journal ArticleDOI
TL;DR: The swelling potential, shrinkage limits, strength development and durability of crushed waste ceramic base geopolymer cement (CWCbGPC) treated test soils A, B and C have been studied under the lab.
Abstract: The swelling potential, shrinkage limits, strength development and durability of crushed waste ceramic base geopolymer cement (CWCbGPC) treated test soils A, B and C have been studied under the lab...

21 citations

Journal Article
TL;DR: In this paper, an attempt is being made to stabilize the Highly Expansive soil using the combination of oldest material i.e. Lime and the newly used recent material (Randomly Distributed Nylon fibers).
Abstract: In The present study, an attempt is being made to stabilize the Highly Expansive soil Using the combination of oldest material i.e. Lime and the newly used recent material i.e. Randomly Distributed Nylon fibers.Lime improves the geotechnical properties of soil and Nylon fiber increases the strength properties. In the present study, an attempt has been made to combine both materials to improve geotechnical properties as well as to increase the strength of the expansive soil. In the present study, Lime is used in three different percentages (2%, 4%, 6%) and Nylon fibers are used as three different percentages (0.2%, 0.4%, 0.6%) in three aspect ratios i.e. L/D ratios (50, 100, 150). Atterberg Limits, standard proctor test, free swell index, swelling pressure, unconfined compressive strength test, California Bearing ratio test and expansion ratio test are performed on different combinations. The Soaked CBR, UCS and swelling pressure are improved more than satisfying limits. Keywords–Black cotton soil, Lime, Nylon fibers, Stabilization, CBR, UCS
Journal ArticleDOI
TL;DR: In this article , the effect of different concentrations of granite sludge powder (GSP) on the index and engineering properties of black cotton (BC) soil was evaluated, and it was shown that GSP up to 30% can improve expansive soils geotechnical properties and could be used in subgrade applications for low volume roads.
Book ChapterDOI
24 Nov 2022
TL;DR: In this article , the swelling characteristics of geocell and jute fibre reinforced expansive soil specimens were investigated using one-dimensional swelling experiments in a CBR mold, and the results showed that the swelling behavior of jute fiber and geocell reinforced specimens improved.
Abstract: AbstractTo mitigate the effects of the problem created by expansive soils, a number of mitigation techniques are applied. Sand cushioning, chemical stabilization, belled piers, granular pile anchors, and other techniques are only a few examples. It is also possible to reduce the swelling of expansive soil by stabilizing it with randomly distributed fibres. Geosynthetics such as geocells have been utilized as reinforcement in the construction of structures such as foundations, embankments, retaining walls, highways, and so on. This research article discusses the swelling characteristics of reinforced expansive soil. The swelling characteristics of geocell and jute fibre reinforced expansive soil specimens were investigated using one-dimensional swelling experiments in a CBR mould. The geocell reinforced specimen’s swell potential and swelling pressure dropped until 0.80% fibre content and then increased at 1.60% fibre content. Swell potential and swelling pressure reduced as fibre length increased, but only until 40 mm, after which they increased for fibre lengths of 50 and 60 mm. The rate of swelling confirms the above observation. In comparison with the unreinforced specimen, the swelling behaviour of geocell–jute fibre reinforced expansive soil specimens improved. The study highlights the use of geocells and jute fibre towards the stabilization of expansive soil.KeywordsSwellingExpansive soilGeocellJute fibreSwell potentialSwell pressure
References
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Journal ArticleDOI
TL;DR: Expansive clay soils have been encountered at the sites of structures throughout the western United States as discussed by the authors, where most of these structures are hydraulic, and the normal difficulties encountered w...
Abstract: Expansive clay soils have been encountered at the sites of structures throughout the western United States. Inasmuch as most of these structures are hydraulic, the normal difficulties encountered w...

489 citations

Journal Article
TL;DR: A discussion of an earlier paper with the aforementioned title by E. Cokca, published in this journal (Volume 127, Number 7, July 2001), is presented in this article, where the discusser states that the author has presented an interesting paper that enriches the literature and furthers knowledge on fly ash, especially as it concerns this product outside the U.S.
Abstract: A discussion of an earlier paper with the aforementioned title by E. Cokca, published in this journal (Volume 127, Number 7, July 2001), is presented. The discusser states that the author has presented an interesting paper that enriches the literature and furthers knowledge on fly ash, especially as it concerns this product outside the U.S. Based on his experience in this field, the discusser offers some comments on: fly ash; the origin of coal; lime, cement, and fly ash; swelling potential; and x-ray diffraction and scanning electron microscopy, as they relate to the author's work. Closure from the author is included.

349 citations

Journal ArticleDOI
TL;DR: In this article, several methods have been suggested to control the excessive heave associated with swelling of expansive soils, which can cause considerable distress to lightweight civil engineering structures, such as bridges.
Abstract: Excessive heave associated with swelling of expansive soils can cause considerable distress to lightweight civil engineering structures. Several methods have been suggested to control this problem....

347 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of polyester fiber inclusions and lime stabilization on the geotechnical characteristics of fly ash-soil mixtures were investigated, and it was concluded that the expansive soil can be successfully stabilized by the combined action of fibers, lime, and fly ash.
Abstract: An experimental program was undertaken to study the effects of polyester fiber inclusions and lime stabilization on the geotechnical characteristics of fly ash-soil mixtures. An Indian fly ash was mixed with expansive soil in different proportions. The geotechnical characteristics of fly ash-soil specimens, lime-soil specimens and lime-fly ash-soil specimens mixed with different proportions of randomly oriented fibers were investigated. Lime and fly ash were added to an expansive soil at ranges of 1–10% and 1–20%, respectively. Test specimens were subjected to compaction tests, unconfined compression tests and split tensile strength tests. Specimens were cured for 7, 14, and 28 days after which they were tested for unconfined compression tests and split tensile tests. Based on optimum values obtained for lime and fly ash, tests were conducted on test specimens prepared from fly ash-expansive soil- lime-fiber mixture after 28 days of curing. Samples were tested with 0, 0.5, 1.0, 1.5, and 2% plain and crimped polyester fibers by dry weight. Based on the favorable results obtained, it can be concluded that the expansive soil can be successfully stabilized by the combined action of fibers, lime, and fly ash.

290 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the influence of polypropylene fiber reinforcement on expansive soil stabilization and found that fiber reinforcement enhanced the unconfined compressive strength (UCS) of the soil and reduced both volumetric shrinkage strains and swell pressures of the expansive clays.
Abstract: The results of a research study to investigate the influence of discrete and randomly oriented polypropylene fiber reinforcement on expansive soil stabilization are presented. Two expansive soils were used as control soils in the testing program. Two types of fibers and four fiber dosages (0,0.3,0.6, and 0.9 percent by dry weight of soil) were considered. Both raw and fiber-reinforced clayey samples were prepared and subjected to unconfined compressive strength (UCS), volumetric shrinkage, three-dimensional free swell, and swell pressure tests. Test results were statistically analyzed to investigate the effectiveness of fiber reinforcement on strength, swell, and shrinkage characteristics of expansive clays. Results indicated that the fiber reinforcement enhanced the UCS of the soil and reduced both volumetric shrinkage strains and swell pressures of the expansive clays. The fiber treatment also increased the free swell potential of the soils. Practical implications of the findings and future research dir...

156 citations