Dados do Trabalho

Título

INFLUENCE OF FLY ASH ON THE STRENGTH OF A CLAYEY SOIL STABILIZED WITH LIME

Resumo

Fly ash obtained from power stations poses challenges for its disposal and subsequential environmental impact. However, these waste materials can be repurposed to improve soil stability. The technique of treating soil with fly ash and lime is an attractive method when the project requires improvement of the local soil for construction purposes. It can be used to create stabilized bases under pavements, support layers for shallow foundations, or to strengthen slopes in slope stability problems. It has been discovered that there is a unique correlation that controls the strength of the compacted soil-fly ash-lime mixtures that have been studied. Using this relationship, it’s possible to determine the appropriate amount of lime and fly ash, as well as the compaction effort needed to create a mixture that meets the strength requirements of a project at the optimum cost [1]. This study evaluates the unconfined compressive strength (UCS) of a clayey soil treated with different percentages of lime and fly ash at different porosities. The ICL (Initial Consumption of Lime) Method was used to determine the optimal lime content, with three percentages (3, 5 and 7%) for lime and three percentages of fly ash (0,0, 12,5 and 25,0%) being tested for unconfined compressive strength (UCS) at three different porosities and a curing time of 28 days. Additionally, a physical–chemical and mineralogical characterization of the lime and fly ash was carried out using laser granulometry and X-Ray diffraction analysis (XRD). The results show that the unconfined compressive strength (UCS) increased with the amount of lime and fly ash for the percentages tested and that these parameters as well as the porosity of the mixture play a fundamental role in the assessment of the target strength.

[1] Consoli, Nilo Cesar; Dalla Rosa, Amanda; Saldanha, Rodrigo Beck. Variables Governing Strength of Compacted Soil–Fly Ash–Lime Mixtures. Journal Of Materials In Civil Engineering, 2011, 23(4): 432-440

Palavras-chave

Fly ash; Lime; Unconfined compression tests; soil improvement

Arquivos