| Author | Dit Preedaprachyakul |
| Call Number | AIT Thesis no.ST-19-25 |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-19-25 |
| Abstract | This research is carried out for improve the mechanical strength of pre-placed aggregate concrete. Mainly focus on the flexural strength of “preplaced aggregate concrete”. Flexural strength is concern in rigid pavement because of the force acting on it create the bending force to it. In this study, the amount of sand, silica fume, and polymer admixture (VAE) are carefully selected by literature reviews and pre-screening test to achieve the preferable fresh properties for grout. Flow time and Mini Cone Slump were used to test on fresh properties. The design of experiment method was used to develop the experiment. 2k (two-level factorial design) model was selected, the center point of the cube geometry and center point on each face of cube geometry were added for more accurate results. The analysis was done by using response surface design which shows the effect of each factor in non-linear plot thus the plot was more closely to the result from experiment. The statistical software called MINITAB17 was used to analyze the result. The amount of superplasticizer was set to constant at 0.7% of binder weight throughout the experiment to avoid the effect to fresh properties as it is not the factor in this study. From the analysis, it shows that all factors affected to the fresh properties as increase in any factor level, the flow time increase. However, PA/C shows the opposite result on the mini slump test as diameter of slump increase when level of PA/C increase. On hardened properties of PAC, the analysis shows that when the level of S/B and SF/C increase both compressive and flexural strength of PAC increase. The mechanical properties of PAC also improve when PA/C was added in the optimum level. The highest flexural strength of PAC obtained from the experiment was 6.018 MPa at 28 days. The result was achieved the requirement of airport taxiway and runway rigid pavement. |
| Year | 2019 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-19-25 |
| 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) | Punchet Thammarak;Thanakorn Pheeraphan; |
| Examination Committee(s) | Pennung Warnitchai;Raktipong Sahamitmongkol; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2019 |