concrete thickness
1.Make use of the geology radar method, find out the of tunnel inside concrete thickness and variety effection, whether attain the engineering design request; Find out the infuse the concrete of the tunnel and geologic stratas to get in touch with the close degree, Whether the existence is loose, take off empty and crack; exploration the tunnel collapse procession whether exist the partial loose, the dense is solid not quite right and shed off to become the space etc.
7.The results show that the damages to the appearance of concrete structures exposed to atmosphere, including honeycombing, cracking along rebar, rebar corrosion, and concrete delamination, are quite serious, that the poor quality of concrete construction, the insufficient thickness of local concrete cover, and the rebar corrosion expansion and dilatancy induced by carbonization of concrete cover are the main causes, and that the main form of damages to the overflow structure is the abrasion resulted from water scouring.
