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Bone ash influence on soil consolidation
Ayininuola, Gbenga Matthew1, Akinniyi, Bashir Damilola2.
Research work on the utilization of bone ash as soil stabilizer revealed that the ash has
positive effect on soil strength but no report on it influence on soil settlement. In order for a
material to act as stabilizer, its impact on soil settlement characteristics must be investigated.
Hence, this research investigated the influence of bone ash stabilizer on the settlement
characteristics of soil. Two soil samples were collected from two locations within Ibadan
metropolis Nigeria. Bone ash was prepared from calcination of cattle bones at a temperature of
1100°C in electric furnace. After grinding, the ash was added to the collected soil samples in
varying proportions by dry weight (3%, 5%, 7%, 10%, 15% and 20%) in order to determine the
compressibility behaviour of the soil at different proportions of bone ash. The settlement
characteristics investigated were compression index, coefficient of consolidation, preconsolidation
pressure, coefficient of area and volume compressibility and initial void ratio of
both control soils and twenty four stabilized soil samples. The result revealed that Soils A and B
coefficient of volume and area compressibility, and compressibility index reached their lowest
level at 7 and 10% stabilization which is good for engineering. The soils pre-consolidation
pressure and coefficient of consolidation reached peak values at 7 and 10% bone ash stabilization.
Therefore, addition of about 7 to 10% of bone ash to the soils will reduce their settlement
potential and increase their stability.
Affiliation:
- University of Ibadan, Nigeria
- The Hong Kong University of Science and Technology, Hong Kong
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