Analyzing on flaw of concrete excavation piles in the Jimei railroad-highway overpass project;

Combined with practical work,in view of the problems encountered in construction processes of manual hole digging pile such as un-derground water,shifting sand,mud and so on corresponding treatment measures are discussed as well as pouring construction of pile concrete.

Underwater repair technology on concrete defects;

Mending of concrete defects in spillway tunnels of Kelanggur Hydro Project;

The usage of chloroprene mortar and acrylamide mortar in the concrete defect treatment of tunnel;

This paper summarized the development status of ultrasonic testing which is a traditional concrete flaw detecting technology.

The concrete model made in a dimension 6 m by 2 m by 10 m with different flaws was used for researching the feasibility and practicality of surface wave in concrete flaws detection.

Lead on to the defect in pile body of bored caisson pile, mainly relate to wall mud, boring drill rate, 3 materials of concrete (cement, sand,stone), water cement ratio and mixing quality controlled by concrete under water when pouring, self defect of pouring conduit, and operation way heighten conduit, and so forth.