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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 13 Abstracts search results
Document:
SP85-11
Date:
April 1, 1985
Author(s):
Floyd E. Dimmick, Sr.
Publication:
Symposium Papers
Volume:
85
Abstract:
During the winter of 1980 the cooling tower portion of work on the Stoney Brook Energy Center, Ludlow, Massachusetts was stopped due to cementitious grout failure in the precast concrete joint connections. Each precast concrete tee was connected to another tee by a cementitious grout joint. The grout apparently foamed during the installation. It was reported by the contractor that the grout was installed under conditions of application favorable for proper usage as specified by the grout manufacture-The average compressive strenqth of the foamed portion of the grout was 400 psi (2 .8 MPa). The depth of the foamed grout varied from 2.5 to 4 inches (63-101 mm). Three very important factors influenced the selection of the replacement material : low substrate temperature during application, low temperature application ability and product curability at sub-zero degrees fahrenheit temperatures. After a thorough investigation by the contractor of epoxy and cementitious grout manufacturers, it became apparent only one company was capable of supplying a commercially available product able to meet the above stated application conditions. A patented two-component modified epoxy mortar was selected from a U.S. manufacturer. This report is broken down into eight categories: selection of repair material; epoxy mortar selection; surface preparation; equipment, mixing and installation; independent laboratory results; conclusions; and recommendations listing quality control measures to be followed by others attempting this type of repair.
DOI:
10.14359/6544
SP85-10
Stephen H. Tsui
This paper reports the structural investigation, concrete testing, and rehabilitation program for a concrete clarifier in a water treatment plant at Belle River, Ontario, Canada. This plant was constructed in 1945 with non-air entrained, site mixed concrete. Extensive concrete scaling and spalling, traces of leakage and random cracking were observed on the tank wall surfaces. Both analytical methods and in-situ testing were employed to evaluate the structural adequacy of the clarifier. removal of deteriorated concrete, Remedial works involving construction of an exterior semi-circular protective concrete wall with buttresses plus repairs to the interior wall were completed in July, 1981.
10.14359/6543
SP85-09
Theodore Prudon and Jerry Stockbridge
The 53-story Woolworth Building in New York was designed by Cass Gilbert. Ornamental Significant deterioration in the highly terra cotta facade necessitated the extensive renovation program which was completed in 1981, Extensive field and laboratorv testing was performed to develop the optimum selected utilized un the actual facade pi repair scheme. The its formed in molds t eces.precast concrete system taken from impressions
10.14359/6542
SP85-08
Kenneth C. Hover
The use of Cathodic Protection, or the application of an electrical potential difference to reinforcing steel in concrete, has proven to be an effective means of controlling the corrosion of the steel and the subsequent deterioration of the concrete. Although this method has been successfully applied to metal structures of many types including offshore structures, the hulls of ships, and buried pipelines, the use of cathodic protection in reinforcing steel is a relatively new approach. Part I of this paper traces the development of cathodic protection, and describes the principles behind the method. Part II describes the installation, monitoring, and evaluation of a catho-dic protection system installed over a 14,000 SF (1300 m2) portion of a reinforced concrete parking garage in 1977.
10.14359/6541
SP85-07
Stella L. Marusin
A large complex of exposed-frame reinforced concrete high-rise apartments began to exhibit severe deterioration after 18 years of service. Tests on concrete extracted from the exposed columns, spandrels and balcony slabs confirmed that large amounts of chloride ions were present in the areas of deterioration. The concrete deterioration related to the corrosion of the embedded reinforcing steel of these structures. laboratory tests to materials and repair techniques, develop appropriate repair I) portland cement acrylic modified cast-in-place concrete and hand-placed epoxy mortar were selected as the restoration materials. used in the restoration are described. The repair techniques
10.14359/6540
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