Strengthening of reinforced concrete beams using near surface mounted prestressing wires and high strength mortar | |
| Author | Chen, Gang |
| Call Number | AIT Thesis no. ST-03-29 |
| Subject(s) | Reinforced concrete Concrete beams Flexure Strength of materials |
| 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-03-29 |
| Abstract | There is a need to develop cost-efficient technology for increasing flexural strength of reinforced concrete (RC). The objective of this study is to investigate the structural behaviors of RC beams using near surface mounted (NSM) technology, by using prestressing wires as reinforcement and different types of filling materials as matrix. Ten RC beams, included two control beams and eight strengthened beams are tested. Test results of strengthened beams, based on first crack and ultimate loads are compared with that of control beams. The experimental results are compared with predicted values. The theoretical prediction and cost analysis are also performed. Test results showed that strengthening RC beams using NSM Prestressing wires with filling materials resulted in significant improvement in mechanical behaviors. Among four series of strengthened beams investigated, the most significant improvement is obtained by using epoxy with average increases of 85% in modulus of rupture (MOR) and 43% in toughness. The significant improvement is also obtained by using high strength mortar plus 90° bent-up at both ends of prestressing wires with average increase of 68% in MOR and 43% in toughness. Crack, yielding and ultimate loads of strengthened beams are higher than that of control beams. The use of 90° bent-up at both ends of prestressing wires resulted in a significant increase in the load carrying capacities of RC beams strengthened by using prestressing wires embedded in high strength mortar, and the cost of unit increasing strength strengthened is relatively cheaper. Considering efficient cost and effective improvement in mechanical behaviors of RC beams, high strength mortar and prestressing wires are recommended to use to replace expensive fiber-reinforced polymer rods and epoxy in developing countries. |
| Year | 2003 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-03-29 |
| 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) | Kim, Kidu;Barry, William J.; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2003 |