Accession Number : ADA183709

Title :   Condition Survey of Lock Number 8, Monongahela River.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB

Personal Author(s) : Stowe,Richard L

PDF Url : ADA183709

Report Date : Jun 1987

Pagination or Media Count : 158

Abstract : A condition survey was performed at Lock and Dam No. 8 on the Monongahela River in Pennsylvania to determine the quality of concrete, extent of possible concrete damage, process causing distress of the concrete, and selected physical and mechanical properties of the concrete and foundation materials. The field investigation included a visual examination of the lock and drilling operations to recover concrete and foundation core. Results of the field investigation and laboratory tests indicated that the processes causing distress in the concrete are freezing and thawing action and alkali-silica reaction. The concrete is extensively damaged on and near the top of the guide, guard, and lock walls. Overall the lock concrete is in poor condition evidenced by fine to wide cracking, light to severe scaling, and large spalls. Low-quality concrete exists to depths of 3 ft vertically and 3 ft horizontally in the guide, guard, and lock walls. Concrete beneath the damaged zones is considered to be of good quality. Cores recovered from the two upstream gate recess monoliths contain rubble and broken (first-size) and cracked concrete. Damaged concrete in the landwall upper gate recess at least 3 ft from the sector pin assembly.

Descriptors :   *LOCKS(WATERWAYS), *REINFORCED CONCRETE, ALKALI METALS, CHEMICAL REACTIONS, CONCRETE, CORES, CRACKS, DAMAGE, DRILLING, FREEZING, HIGH RATE, INTENSITY, LABORATORY TESTS, LIGHT, LOW LEVEL, MATERIALS, MECHANICAL PROPERTIES, PENNSYLVANIA, PHYSICAL PROPERTIES, PINS, QUALITY, SCALING FACTORS, SILICON DIOXIDE, SURVEYS, DETERIORATION, INSPECTION

Subject Categories : Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE