Repair of reinforced concrete slabs using modified ferrocement laminate | |
| Author | Montree Boonyapongphun |
| Call Number | AIT Thesis no.ST-05-07 |
| Subject(s) | Concrete slabs Reinforced concrete |
| 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-05-07 |
| Abstract | The objective of this study is to carry out an experimental program for strengthening of the slab systems by using ferrocement laminate with and without steel plates. By using this technique, the ferrocement laminate which is placed under the slab is fastened by using steel plates spaced at different intervals and located on top of the concrete slab by using anchored rods. The main parameter used in this study is the spacing of the steel plate which is 0.40 m. and 0.60 m. The length of steel plates is kept constant and the positions of anchored rods are at 0.10, 0.325, and 0.55 m. from each supporting beam. Comparison tests are also carried out on the slab system which is strengthening by using high strength polymer modified mortar available commercially. The results of this experiment include first crack load, ultimate load, deflection characteristics, strain in anchored rods and failure pattern after the strengthening of the slab systems. A cost analysis is also conducted. Based on the results obtained in the study, it is found that the provision of steel plates at certain spacing on top of the beam-slab system resulted in an increase on the load carrying capacity of the composite. In other words, these steel plates are effective in the strengthening of the slab system. The more the number of steel plate provided, the higher the increase in load carrying capacity of the system. In addition, repair mortar technique indicates the highest first crack load among all the strengthened specimens because its modulus of rupture is higher than ferrocement laminate. However, the collapse mechanism of repair mortar showed a brittle failure whereas strengthening by using ferrocement laminate with steel plates showed a more ductile failure. Besides, it is found that anchored rods near middle span are more effective than those near the supporting beam. In addition, anchored rods can improve bond between existing slab and new mortar layer because they can resist higher horizontal shear in the strengthened specimens. The total cost of the strengthened specimen using repair mortar indicated the highest cost among all the strengthened specimens. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-05-07 |
| 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 Nimityounskul; |
| Examination Committee(s) | Pennung Warnitchai;Thanakorn Pheeraphan; |
| Scholarship Donor(s) | The Treasury Department - Royal Thai Government Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |