| Author | Canillas, Emmanuel Campanero |
| Call Number | AIT Thesis no. AE-90-03 |
| Subject(s) | Tillage--Research
|
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Experiments were conducted in a laboratory soil bin to
evaluate the performance of coated floats in different soils.
Floats with 15 cm width and 30 cm length were fabricated from
0.32 cm mild steel plate. The three floats each were coated
with enamel and Teflon and the three were uncoated. Three
soil types viz. clay, loam and sandy soil were used for
testing. The drag forces required to pull the floats over the
soil surface were measured with the help of load cells. The
normal loads were varied to 24.5 , 44.1 and 63.7 N. The effect
of moisture content was evaluated by varying the soil moisture
from 21.2 to 62.4% (db ) for clay soil , 16.6% to 36.1% (db) for
loam soil and 0.7% to 13.8% (db) for sandy soil. All tests
were conducted at a constant float speed of 0.20 m/s.
The performance of the enamel coated floats was superior
to Teflon and uncoated floats in all soil conditions tested.
The drag force increased with normal load for all floats. In
clay and loam soils, the drag force increased initially until
the soil moisture content reached the plastic limit. However,
the drag force showed a decreasing trend once soil moisture
exceeded t he plastic limit. For sandy soil , however, the drag
force increased with moisture content. Depending on the normal
load and soil moisture content, the overall reduction for the
enamel coated float compared to uncoated float were from 4
to 64% in clay soil , 16 to 46% in loam soil and 26 to 45% in
sandy soil. Besides this superior performance of the enamel
coated float compared to the other floats, it showed excellent
resistance to wear due to abrasion and scouring. Considering
the above findings , the use of enamel coating in clay, loam
and sandy soil is recommended. |
| Year | 1990 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Salokhe, Vilas M.
|
| Examination Committee(s) | Singh, Gajendra ;Gee-Clough, D. ;Gupta, Chandra P.
|
| Scholarship Donor(s) | New Zealand Government |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1990 |