Prediction of workability of fresh concrete containing fly ash | |
| Author | Surasak Pongporncharoen |
| Call Number | AIT Thesis no. ST-97-04 |
| 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, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-97-04 |
| Abstract | The aim of this study is to propose the model for predicting the workability of fresh concrete, measured by slump test, containing fly ash from Thailand. The model will be useful as a part for developing the mix proportioning method of fly ash concrete. Major parameters considered to affect the slump of concrete are ratio of paste volume to volume of void of total aggregate phase (y), free water content (Wrr) and surface area of total aggregate phase (Sagg). The volume of free water can be obtained by deducting the water which is retained by (in and at the surface of) powder materials and aggregate particles from the unit water content of concrete mixture. The water retained by powder material can be easily evaluated by finding a point of largest water to powder material ratio by weight that leads to a zero-slump paste. The surface area of the aggregate pa1iicles is computed from the gradation curve by assuming that it has a spherical shape and then apply an angularity factor (II) to the computed spherical surface area. It was found from the experiment that the slump of fresh concrete varied linearly with free water content but nonlinearly with y and Sagg· A unique mathematical model for predicting slump of concrete was formulated and verified with the actual results. The proposed model showed the satisfactory sensitivity in predicting the slump when y was ranged within 1.00-1.50 but it could not exactly predict the slump of segregated concrete. In addition, this model can be generally utilized for concrete of which slump value can be used for workability evaluation, not limited only for using fly ash as replacement material but also for other kinds of replacement material of which the water retainability is known. |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-97-04 |
| 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;Pichai Nimityongskul; |
| Examination Committee(s) | Somnuk Tangtermsirikul;Worsak Kanok-Nukulchai;Baba, Keizo; |
| Scholarship Donor(s) | Asian Institute of Technology Partial Scholarship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1997 |