| Author | Tan, Hock Chuan |
| Call Number | AIT Thesis no. ST-91-25 |
| Subject(s) | Concrete--Testing
Concrete--Mixing
|
| Note | A thesis submitted in partial fulfillment of the requirements
for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | An experimental program is conducted to investigate the mechanical properties of high
strength concrete containing pozzolanas and superplasticizer. Three different grades of concrete,
namely Grade 35, 40 and 45, were designed by the method proposed by the Department of Environment, United Kingdom. Two types of pozzolanas were used namely, rice husk ash and silica
fume. For rice husk ash, the percentage of cement replacement were 20% and 40% whereas for
silica fume a constant dosage of 5 % by weight of cement was adopted. The dosage of superplasticizer
was kept constant at 1 % by weight of cement and Ordinary Portland cement Type I available locally
was used. Among the mechanical properties of concrete tested were workabilities, wet densities,
compressive strength at 3, 7 and 28 day and flexural strength at 28 days. An investigation on the
physical and mechanical properties of RHA was carried out. A cost analysis for each mix was also
conducted.
The results showed that in order to achieve the same workability, concrete containing rice
husk ash resulted in a higher water/cementitious materials ratio than ordinary Portland cement
concrete. On the contrary, the use of silica fume and superplasticizers significantly reduced the
final water/cementitious materials ratio. For the rice husk ash used in this study which passed Sieve
No. 325 98%, it is possible to develop high strength concrete by replacing ordinary Portland cement
with 20% rice husk ash. However, if the percentage of replacement is increased to 40% the results
were found to be slightly lower than the required strength. Concrete containing rice husk ash was
found to be the most economical mixes whereas concrete using silica fume as admixtures was much
more expensive. |
| Year | 1991 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pichai Nimityongskul |
| Examination Committee(s) | Pama, Ricardo P. ;Ogunlana, Stephen O.
|
| Scholarship Donor(s) | DAAD |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1991 |
