Mixing and compaction of fibre- and lime-modified cohesive soil
| Autor: | Gary John Fowmes, Craig Gelder |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Polypropylene
Materials science Moisture 0211 other engineering and technologies Compaction Mixing (process engineering) Soil Science 02 engineering and technology Building and Construction engineering.material Geotechnical Engineering and Engineering Geology chemistry.chemical_compound 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Shear strength (soil) Mechanics of Materials Soil water engineering Geotechnical engineering Composite material Water content 021101 geological & geomatics engineering Lime |
| Zdroj: | Proceedings of the Institution of Civil Engineers - Ground Improvement. 169:98-108 |
| ISSN: | 1755-0769 1755-0750 |
| DOI: | 10.1680/grim.14.00025 |
| Popis: | Fibre reinforcement is a versatile method of increasing the shear strength of soils for earthwork applications. However, research to date has encountered a number of problems when utilising cohesive host soils. The aim of this study was to develop a suitable site-applicable method of mixing fibre into cohesive host soils. Intermediate plasticity clay reinforced with monofilament polypropylene fibres was used in the laboratory investigations. In order to mix the fibres successfully, the initial moisture content of the host soil was increased prior to the introduction of fibres. By introducing quicklime, excess moisture was removed through the hydration process, and a portion of free water was effectively held within aggregations of flocculated clay particles, thereby having little influence on the dynamic boundaries. Fibrous inclusions within the clay clods resisted compactive effort, forming an interlocked structure. As a result, the optimum moisture content increased and the maximum dry density decreased. This trend was heavily dependent on the interfacial shear resistance along the fibre boundary, which consequently decreased as the water content increased or the compactive effort was increased. Results from strength tests confirmed that both peak and post-peak shear strength increased, creating a more ductile material capable of maintaining shear strength at high levels of strain. |
| Databáze: | OpenAIRE |
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