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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 33 Abstracts search results
Document:
SP109-14
Date:
August 1, 1988
Author(s):
J. E. McDonald and T. C. Liu
Publication:
Symposium Papers
Volume:
109
Abstract:
The U.S. Army Corps of Engineers currently operates and maintains 269 navigation lock chambers along inland and coastal waterways. Approximately one-half of these structures were built prior to 1940. Consequently, the concrete in these structures does not contain intentionally entrained air and is, therefore, susceptible to deterioration from cycles of freezing and thawing. In response to a need for improved technology in evaluation and repair of such structures, the Corps of Engineers initiated the Repair, Evaluation, Maintenance, and Rehabilitation (REMR) research program. The objective of this comprehensive program is to develop effective and affordable technology for prolonging the service life of existing civil works structures. Individual REMR research studies, which relate to the evaluation and repair of concrete in a marine environment, are described in this paper. Results to date indicate that techniques and equipment are available for underwater evaluation and repair of concrete structures without the necessity of dewatering.
DOI:
10.14359/3598
SP109-18
A. M. Nawwar and V. M. Malhotra
Paper describes the development of a test method to determine the ice abrasion and/or impact resistance of concrete. Briefly, the method consists of testing specially fabricated 300 mm diameter x 500 mm length cylindrical concrete specimens against ice abrasion and/or impact. The ice abrasion and impact pressure on rotating concrete cylinders are produced using an ice block, located above the concrete samples, the vertical travel of the ice being controlled by a hydraulic ram. The measurements taken during the test include the determination of the surface profile of the concrete specimens, the output from strain gages mounted on the reinforcing rods in the specimens, and the impact speed and acceleration of the ice block. Preliminary tests indicate that the apparatus developed offers a promising mechanism for studying the resistance of concrete to ice abrasion and/or impact. The limited available data show that the surface finish of a test specimen greatly affects the initial abrasion resistance of concrete.
10.14359/3585
SP109-31
A. J. Hulshizer and A. Kodal
The ocean-cooling water supply and return system for the Seabrook Nuclear Power Plant is a vital link in the operation of the multibillion dollar facility. The water conveyance system is comprised of three main concrete construction components, each representing different construction techniques and somewhat different corrosion problems and approaches to promoting durability. Concrete intake heads, weighing 227 tons each, were precast off site and utilized nickel-coated reinforcement as a special means to preclude corrosion which otherwise would be accelerated by the presence of a 90-10 copper-nickel anti-fouling cladding. Prefabricated 1.52 and 2.87 m diameter vertical ocean shafts have their steel outer casings protected against corrosion by a mesh reinforced, spin cast, low water-cement ratio, mortar lining. Over 10 km of 5.8 meter diameter tunnels and the vertical land shafts were constructed of conventional cast-in-place, reinforced concrete. The subsea location of the structures and the depth of the tunnels demand that the concrete perform virtually maintenance free for the 40 year design life of the plant. Paper discusses the initial design considerations, construction experiences, and observations from the underwater inspection conducted on the various concrete components, after having been submerged for as much as 7 years at the time of inspection.
10.14359/3570
SP109-19
G. C. Hoff
The mechanism by which ice floes occurring in rivers, lakes, and oceans can damage concrete structures in the water is hypothesized. Various test methods to evaluate the effects of ice abrasion and impact on concrete are reviewed, and selected results using these methods are presented. Several field studies of the effects of ice abrasion on concrete structures are identified.
10.14359/3576
SP109-32
A. R. Al-Rabiah, R. Baggot, and Rasheed Dizzafar
Describes the construction of the 25-km King Fahd Causeway in the Arabian Gulf. On the basis of a review of the performance of marine structures elsewhere in the world, the paper outlines the salient features of concrete deterioration in sea water and discusses the durability requirements for concrete construction in marine environment. Concrete durability considerations for the causeway are outlined in selection of concrete materials and mixes. The durability monitoring of the causeway is being carried out in two phases. Phase I involves continuous visual inspection of the structure, and Phase II includes long term investigations on concrete specimens exposed to submerged, tidal, and atmospheric zones of the Arabian Gulf.
10.14359/3308
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