Strength prediction of fly ash concrete containing admixtures using the microwave curing process | |
| Author | Kongdej Cheawchan |
| Call Number | AIT Thesis no.ST-03-21 |
| Subject(s) | Fly ash Microwave heating |
| 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 |
| Series Statement | Thesis ; no. ST-03-21 |
| Abstract | Microwave curing may provide a source of heat to accelerate the hydration rate, as a result high early strength can be obtained. Consequently the strength of concrete accelerated by using microwave curing technique has been shown to potentially estimate the long-term strength of concrete. The research on microwave curing to accelerate the very high early strength development of fly ash concrete with admixture, which motivates the need to estimate the long-term strength, has not yet been performed. Hence, the usefulness of the prediction of the 28 and 91-day compressive strength concrete containing fly ash within a short period of time is obvious. The estimation of the 28-day and 91-day strength fly ash concrete containing admixture at early age, the equation that developed from the optimal microwave curing processes can predict the long term strength of concrete containing chemical admixtures that is reasonably accurate at the average percentage of error for all types of concrete within ±5.28% and ±8.12% for 28-day strength and 91-day strength, respectively. From the investigation of calcium hydroxide and calcium silicate hydrate results by thermogravimetry analysis (TGA) the amount of calcium hydroxide and calcium silicate hydrate will increase at later age due to the development of the hydration reaction. However, the large amount of fly ash will decrease the amount of calcium hydroxide and increase calcium silicate hydrate due to pozzolanic reaction. For the microwave curing condition, it is difficult to distinguish the amount of CSH between the normal and microwave curing mortar at 1 day because the duration is too short (only 45 minutes compared with a whole day long) and the power of microwave used in the experiment are still inappropriate (P40 for 30 minutes and P30 for 15 minutes). However, at 28 day the amount of CSH from normally cured mortar is greater than the amount of CSH from microwave cured mortar due to the appropriate developed hydration reaction. |
| Year | 2003 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-03-21 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pichai Nimityongkul;Thanakorn Pheeraphan; |
| Examination Committee(s) | Barry, William J.; |
| Scholarship Donor(s) | Royal Thai Government;Partial Scholarship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2003 |