Strengthening of RC beams using developed ultra-high-performance concrete (UHPC) : experimental and numerical comparison | |
| Author | Karki, Subham |
| Call Number | AIT Thesis no.ST-24-09 |
| Subject(s) | High strength concrete Response surfaces (Statistics) |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Ultra-High-Performance Concrete (UHPC) is a special type of concrete which possesses enhanced mechanical and durability properties. An ideal UHPC has workability and flowability of Self Compacting concrete, durability of High performance Concrete and post cracking behavior of Fiber Reinforced Concrete. The use of large amount of cement and quartz sand in UHPC makes the production cost high. Replacement of cement by supplementary cementitious materials can indeed reduce the cost of UHPC but it should still possess the ideal characteristics and properties. This study focuses on producing UHPC possessing strengthening characteristics by using Hydraulic Cement with replacement of cement content in the UHPC mix by Supplementary Cementitious materials and using natural river sand as the only fine aggregate in the UHPC mix. Furthermore, the developed UHPC will be used to strengthen the beam and the experimental results will be studied and compared with numerical model results.Modified Andersen and Andreasen particle packing model and Design of Experiments was used to produce a set of mix proportions to develop a statistical model i.e. Response Surface Methodology model. The model is based on the analysis and study of responses, i.e. the experimental results of UHPC influenced by the inputs i.e. raw materials used. This model can predict the responses and can also optimize the response. An optimized mix proportion was produced with reduced cement content and the properties were verified experimentally. The results were accurate, and the model was validated. Finally, using the developed UHPC strengthening experiments were conducted to strengthen the beam. The results show that UHPC strengthening technique can improve the flexural as well as shear capacity significantly. Numerical models were developed using ATENA 3D to estimate the characteristics of control as well as strengthened beams. It was found that experimental results and results estimated by FEM software were consistent. |
| Year | 2024 |
| 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) | Krishna, Chaitanya;Thanakorn Pheeraphan (Co-chairperson); |
| Examination Committee(s) | Raktipong Sahamitmongkol;Punchet Thammarak; |
| Scholarship Donor(s) | AIT Scholarships; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2024 |