Mechanisms of volume change of concrete utilizing Mae-Moh fly ash | |
| Author | Kumpon Subsomboon |
| Call Number | AIT Thesis no.ST-95-9 |
| Subject(s) | Fly ash Concrete--Testing |
| Note | A thesis submitted m paitial fulfilment of the requirement for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-95-9 |
| Abstract | The volume change of concrete, namely shrinkage and expansion has a significant influence on the durability and serviceability of concrete structure. This research introduces some test results on the application of Mae-Moh fly ash from Thailand to be able to design a concrete with highest volume stability and also the prediction of volume change of concrete by introducing model for concrete expansion and model for simulating concrete volume change. Moreover the effectiveness of the use of fly ash in concrete in order to reduce the damage to concrete due to alkali-aggregate reaction to acceptable levels was investigated. Measurement of shrinkage, expansion and volume stability were conducted on cement paste samples. Measurement of expansion due to alkali-aggregate reaction were conducted on mortar bars. The parameters varied in the test are types of fly ash, cement replacement and curing condition. From the test results, it was found that the expansion of paste containing fly ash with high S03 content is greater than the expansion of cement paste. On the other hand, the expansion of cement paste is greater than the expansion of paste containing fly ash with low and medium S03 content. However three types of fly ash, namely fly ash with low, medium and high S03 content were effective in reducing both of shrinkage. From the test of expansion due to alkali-aggregate reaction, it was found that fly ash which has S03 content approximately lower than 5% can reduced the expansion due to alkali-silica reaction. It can be concluded that Mae-Moh fly ash can be applied as pozzolana to replace cement and are effective in enhancing some physical and mechanical properties of the cementitious matrix. A model for predicting expansion of concrete from paste and model for simulating concrete volume change were proposed based on a concept of 2-phase material which are paste and aggregate phases. Test on mortars and no-fine concrete were conducted to verify the proposed model. The proposed model were found to be effective in predicting the volume change of concrete in case of autogeneous shrinkage. |
| Year | 1995 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-95-9 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Aoyagi, Yokio |
| Examination Committee(s) | Somnuk Tangtermsirikul;Pichai Nimityongskul;Wijeyewickrema, Anil C. |
| Scholarship Donor(s) | Naresuan University |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1995 |