A study on the improvement of bond strength between concrete substrate and repairing concrete | |
| Author | Pirawat Changyaem |
| Subject(s) | Concrete Bonds |
| 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 |
| Abstract | This research was aimed at studying the effect of bond strength between the existing concrete to repairing concretes. Attempts to determine bonding agent between the interface zones, optimum moisture content in existing concrete were observed in slant shear test, and in order of surface treatment in existing concrete, repairing concretes was observed in pull-off test. Results show that successful interface bond improvement in bond test and also a full beam modeling test. Cement + non-shrink grout bonding admixture (C2) can improve the bond strength by ettringite form the non-shrink grout penetrated in the old concrete substrate and microcracks between substrate concrete and repairing concrete effect to the interface denser than the existing concrete and achieve high bond strength results. Dry and saturated surface dry conditions are not clearly different for development of bond strength. Three different surface treatment such as as-cast, hand-chisel, and jackhammer were carried out in pull-off and the results show that jackhammer surface treatment work together with cement + non-shrink grout bonding admixture (C2), and self-compacting concrete (SCC) succeed good bond about two times in pull-off compared with control specimen and 12% in beam test compared with full beam. However, some modification in the high-bond capacity interface also needs further study. |
| Year | 2013 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pennung Warnitchai; |
| Examination Committee(s) | Tanakorn Pheeraphan;Punchet Thammarak; |
| Scholarship Donor(s) | Royal Thai Government;AIT Fellowship; |