| Author | Prot Surawattananan |
| Call Number | AIT Thesis no.ST-06-05 |
| Subject(s) | Aggreates (Building materials) Testing
|
| 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-06-05 |
| Abstract | This study was to determine rapid test of inclusion of iron sulfide in aggregates. Suspicious aggregate samples were mostly selected from Chonburi and Saraburi. The samples were crushed to certain smaller sizes to test for inclusion of iron sulfide or other abnormalities by comparing results with regular limestone aggregates. Two tests were carried out: one was laboratory leaching test of aggregates (single extraction) and the other was wet-and-dry accelerated test of concrete specimens made from test aggregates. Leaching test (2 hours of mixing and liquid or distilled water to solid or grounded aggregate ratio of 5) was performed to check acidity, alkalinity, color, pH, and sulfate concentration of leached solution. The accelerated test (6-hour wet and dry cycle) was performed to investigate oxidation rate of suspicious aggregates in alkali environment. The results showed that color, pH, and sulfate concentration of leached solution should be observed to identify abnormalities of aggregates while the oxidation rates of suspicious aggregate required longer period of time to make conclusion. The colors of leached solution of most suspicious aggregates were darker than those of leached solution from limestone. The pH values of leached solution of most suspicious aggregates were lower than 8.1 while those of leached solution from limestone were above 8.1. The sulfate concentrations of leached solution of most suspicious aggregates were greater than approximately 100 mg/L. To conclude, the rapid test of inclusion of iron sulfide or other abnormalities in aggregates was proposed to check color, pH, and sulfate concentration of leached solution obtained as described. The test could be performed within 6 hours |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-06-05 |
| 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 Nimityongskul; |
| Examination Committee(s) | Thanakorn Pheeraphan;Kato, Yoshitaka ; |
| Scholarship Donor(s) | The Royal Thai Government Fellowships; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |