Use of bottom ash as fine aggregate in concrete | |
| Author | Keerati Pakinaga |
| Call Number | AIT Thesis no. ST-99-3 |
| Subject(s) | Aggregates (Building materials) Fly ash Aggregates (Building materials) Fly ash |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Abstract | The propose of this research is to conduct a feasibility of using bottom ash as fine aggregate in structural grade concrete through the investigation of the physical and mechanical characteristics of concrete in fresh and hardened states. The study involved the determination of the physical and chemical properties of the mixture constituents, fresh characteristics including workability, bleeding, setting times, air content and unit weight, and strength and elastic properties of hardened concrete. The use of bottom ash in making high strength concrete is also investigated. The results are compared with concrete made from natural river sand. Tested results showed that The use of bottom ash as fine aggregate increased the demand for mixing water in obtaining the required workability, due to the high absorption rate, angular shape, very porous surface and high specific surface area of bottom ash. Because of the increased demand for mixing water, the bottom ash mixtures displayed a slightly higher degree of bleeding than that of natural river sand concretes. Bottom ash shows could not be regarded as inert materials because the setting times for the bottom ash concrete was insignificantly higher than that of concrete using natural river sand. With regards to normal and high strength concrete, it was found that bottom ash can be used as fine aggregate instead of natural river sand. In normal strength concrete, the average 28-day compressive strength of bottom ash concrete was approximately 300 kg/cm2 (29 MPa) which was about 18 % lower than that of natural river sand concrete. The strength of high-strength bottom ash concrete was found to be approximately 9 % lower than that of natural river sand mixtures and the 28-day compressive strength was 865 kg/cm2 (85 MPa). Use of the bottom ash as fine aggregate in concrete has a same influence on flexural strength as on compressive strength. The flexural strength of bottom ash concrete was lower than that of natural river sand concrete, for the mixtures containing bottom ash without admixture flexural strength drops to 18 % and the difference between the two mixtures reduced to about 32 % when superplasticizer and silica fume were used. Finally, it can be concluded that bottom ash from Mae Moh Power Plants can be satisfactorily used as fine aggregate in making concrete. |
| Year | 1999 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Construction Engineering and Infrastructure Management (CM) |
| Chairperson(s) | Pichai Nimityongskul.;Pichai Nimityongskul.; |
| Examination Committee(s) | Gupta, Satyendra P.;Wijeyewickrema, Anil C.; |
| Scholarship Donor(s) | Royal Thai Government (RTG).; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1999 |