For tunnel-support engineering, the bed separation of surrounding rock has a great influence on support performance bolts. In order to reveal mechanical properties full-grouted prestressed bolt under separation, three typical working conditions single-separation, multi-separation and different positions were set up, theoretical models numerical established. Furthermore, characteristics axial fo...

Abstract A rock bolt is a tendon which can be either rod or strand, installed in borehole to reinforce the surround mass and soil.

Abstract The article describes recent cases of tendon ruptures by corrosion and investigations carried out on some bridges in France. Several causes related to HDPE ducts have been identified such as damages during handling, threading tensioning strands, defective connection the duct anchorage, damage construction or operation, low quality material, etc. These rupture exclusively concern inject...

The feasibility and sensitivity of electrochemical noise (EN), electrochemical impedance spectroscopy (EIS), and linear polarization resistance (LPR) for detection of corrosion in post-tensioning (PT) components was investigated. The use of the electrical resistance (ER) technique, as well EIS and LPR, to detect air space corrosion at the grout voids was also explored. The results showed that h...

Since the establishment of ASTM standard C91, masonry cement mortars have become widely used for masonry construction in low to moderate seismic regions. However, the Masonry Standards Joint Committee Code prohibits the use of masonry cement mortars in lateral force resisting systems for structures that fall into Seismic Design Categories D, E, and F. The general objective of this study is to e...