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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 91 Abstracts search results
Document:
SP128-46
Date:
November 1, 1991
Author(s):
A. M. Paillere and B. Eljaizairi
Publication:
Symposium Papers
Volume:
128
Abstract:
As the results of CEN/PC directives in 1986 and subsequent decisions, the work of CEN/TC 104 "Concrete Performance, Protection, Placing and Compliance Criteria," was extended to cover standardization work on admixtures for concrete (TC 104/WG 3) fly ash for concrete (TC 104/WG 4), mixing water for concrete (TC 104/WG 5), grouts for prestressing tendons (TC 104/WG 6), and sheaths for prestressing tendons (TC-104WC 7). In June 1989, TC 104/WG 8, protection and repair of concrete structures, was formed.
DOI:
10.14359/3397
SP128-28
P. J. E. Sullivan
A 17-story reinforced concrete structure with prestressed concrete floor slab, clad with an architecturally pleasing white cement and calcined stone aggregate, exhibited signs of deterioration after 30 years exposure to central London environment. The investigation was instigated after a piece of concrete spalled from a high level and crashed down. After the investigation, when the cause of the deterioration was established, recommendations were made to the client and specifications for repair were made. After the repair specialist was selected the author supervised the repair ensuring that the specifications were strictly followed. The paper describes the investigations and the rehabilitation of the structure.
10.14359/3388
SP128-15
G. Moriconi, M. G. Pauri, G. Percossi, and S. Busto
An investigation was carried out to evaluate the effectiveness of epoxy systems injected into cracks in concrete in order to repair damaged concrete structures. It was found that the usual parameters (viscosity, elastic modulus) characterizing epoxy system are not sufficient for such an evaluation, since concrete microstructure and crack width are determinant factors. Successful1 injection into larger macrocracks (>0,8 mm) is independent of the epoxy system viscosity. However, for narrower cracks (< O,3 mm), the effectiveness of the injection strongly depends on the viscosity of the epoxy system, so that a threshold value of viscosity can be determined for each microcrack width. The injection of epoxy systems into cracks of porous concretes causes, in addition to the crack filling, an impregnation of the material surrounding the crack area. This impregnation causes a strength increase, which is higher for more porous concretes and higher epoxy system viscosity. The mechanical behaviour of injected concretes do not depend significantly on the mechanical properties of the epoxy system, whereas the rheological properties of the epoxy system can affect the performances of injected concretes.
10.14359/10020
SP128-41
A. L. Landau and T E. Webster
Mr. Landau graduated from Harvard Business School and held positions of major responsibility in the textile field in Germany, Belgium, Canada and the United States. With a background in the global fiber industry, specializing in polypropylene since 1971 Landau introduced the U.S. product, Fibermesh, into the world-wide construction market. Since 1983, he has traveled extensively developing a sales and engineering organization supplying polypropylene fibers for use in concrete. Landau has participated as a speaker in many National and several International Conferences, including the July, 1984 Conference in Rio de Janeiro, Brazil, Rilem Conference in Sheffield, England in July, 1985, XIII Bienniel Conference in Brisbane, Australia, 1987, and the Concrete Society Conference in Hong Kong, July 1987.
10.14359/10022
SP128-02
H. Saricimen, A. J. Al-Tayyib, M. Maslehuddin, and M. Shamim
During the mid-1970s, there was a boom in the construction industry in Saudi Arabia. To meet the housing requirements, and to furnish the infrastructure needed for a growing industry, construction had to be carried out at a pace unprecedented in the country's history. In the absence of guidelines, concrete specifications from other industrialized countries were used. However, when the structures started to show signs of deterioration within a short fraction of their design life, it was realized that specifications developed for temperate conditions cannot be used in this region. Field and laboratory studies carried out at King Fahd University of Petroleum and Minerals at Dhahran, Saudi Arabia, showed that concrete in this region should not only be designed for strength, but also for durability. Since permeability is one of the most important properties that control the durability of concrete, much emphasis should be given to the production of dense and impermeable concrete. This paper reports the results of an investigation carried out on a number of reinforced concrete structures exposed to underground and seawater conditions that showed serious signs of deterioration within less than 10 years after construction. The paper recommends repair procedures for the damaged structures and future practices to extend their service life.
10.14359/1831
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