| Author | Rahooja, Rukhsana A. |
| Call Number | AIT Thesis no.ST-86-22 |
| Subject(s) | Concrete--Mixing
|
| Note | A thesis study 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 | A concrete mix design method was suggested for the proposed runways to be constructed for the new international airports in Pakistan. The properties of the local materials were utilized for the selection of the concrete proportions for the new airfield pavements. The durability of the concrete was also checked for any reaction between the alkalis present in the cement and the active siliceous minerals in the aggregates, proposed to be used as construction material for the new airports. A proposed method was suggested by modifying the existing method of the department of Environment method. Results from an experimental programme indicated that the strength of concrete was considerably increased by increasing the maximum size of coarse aggregates, restricting the slump and proportioning the fine and coarse aggregates according to their individual and combined surface indices. Comparison with different methods of mix design with respect to economy is also included in this study. A rapid test method was introduced to determine the alkali reactivity of the aggregates used. This Was achieved by reducing the size of the specimen bars and subjected to accelerated curing conditions. In addition the release of the alkalis from the cement mortar was inhibited during the curing of the specimens. This enhanced the reaction and the expansions that occurred in the mortar bars can be compared to those obtained by the standard mortar bar test after 3-6 months. The local aggregates selected for the concrete mixes were found safe against alkali-silica reaction. However, if richer mixes were to be used with high cement content and having water cement ratios lower than 0.3, the long term durability of the concrete could be affected due to this reaction. |
| Year | 1986 |
| 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) | Brotton, Derick M. ;Pama, Ricardo P. |
| Scholarship Donor(s) | Royal Netherlands Government |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1986 |