Author: Carl E. Pace

Publisher:

Published: 1981

Total Pages: 440

ISBN-13:

The monoliths of Troy lock, dam, and headgate section must be rehabilitated in the near future or the concrete deterioration will progress to the point that the total structure will have to be replaced. Two specific areas of the structure are now in such a state of deterioration that they essentially will have to be replaced. The concrete in the land wall monoliths upstream of the upper gate have depths of deteriorated concrete in excess of 5 ft. The upper sections of the gated spillway to the powerhouse are so deteriorated that enough sound concrete would not remain for rehabilitation; replacement of the upper sections will be more efficient. The other portions of the lock and dam are generally sound (4000- to 5000-psi concrete interiors) and are adequate for effective and economical rehabilitation. The concrete tensile strength is low because of minor alkali-silica reaction products and ettringite coating of aggregates but it is adequate and is expected to remain adequate. The compressive (900 psi) and tensile (43 psi) strengths of the foundation material are very low but are adequate to resist bearing pressures and given excellent resistance for foundation anchors. There are no soft seams in the slaty-shale foundation. The foundation was very consistent. The predominant geological feature is bedding planes which dip downstream at 30 to 90 deg. This does not present any potential stability problems.