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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 14 Abstracts search results
Document:
SP96-02
Date:
January 1, 1987
Author(s):
Dan Bonikowsky
Publication:
Symposium Papers
Volume:
96
Abstract:
Some of the problems experienced while placing concrete at the Ontario Hydro Darlington Nuclear Generating Station, located on the north shore of Lake Ontario, are described. Also presented are the novel placing methods and procedures used to overcome the placing problems to obtain the resultant quality concrete. Most of the concrete can be considered mass concrete because of its large dimensions. Placements in narrow walls have particular congestion problems and also require a slow placing rate due to formwork design limitations. Methods of achieving good consolidation and controlling time of set are described.
DOI:
10.14359/3503
SP96-03
Lars Forssbald
The subject of consolidation of superplasticized concrete with flowing consistency has been studied by, among others, the Swedish Cement and Concrete Research Institute and the Dynapac Research Department. A basic question is the need for consolidation with regard to different consistencies of the mix, different applications, etc. The effect of internal vibration of superplasticized concrete mixes has been investigated in laboratory tests. The performance of internal vibration in practice is discussed. Surface and form vibration of superplasticized concrete have been studied in laboratory and field tests.
10.14359/3506
SP96-08
H. A. Welton
A brief discussion of consolidation of concrete aimed toward the users of concrete is presented to encourage the use of vibration in improving the quality of the finished product. Significant points leading to successful consolidation of quality concrete include the interrelationship of proportioning, mixing, placement, and application of the vibrator to break down mechanical stacking, eliminate unintentional air voids, reduce residual water content, and achieve densification and enhancement of the micro-structure of the concrete.
10.14359/3507
SP96-11
Mikael P. J. Olsen
The main purpose of concrete consolidation is to reduce the amount of entrapped air and densify the concrete. This can be accomplished by subjecting the concrete to vibration. A recently completed laboratory and field investigation to determine the movements occurring in the fresh concrete during the consolidation process is reviewed and data is presented regarding the relationship between energy level in the concrete and the degree of consolidation achieved. Accelerometers were used to measure the movement of the fresh concrete as a function of time. For the particular concrete mixes tested, a minimum energy of approximately 300 ft-lb (407 N-m) has been found to result in a degree of consolidation of 97 percent or more.
10.14359/3508
SP96-06
E. K. Schrader
Roller-compacted concrete (RCC) is rapidly becoming a popular material for dam construction, heavy-duty paving, and mass fill applications. Its economy comes primarily from being able to transport and place it in large quantities with minimal time and labor by using earthmoving or conveyor equipment. The no-slump mix is spread with bulldozers and compacted into a solid mass with large vibratory rollers. The effect of compaction methods, water content, and other variables on density, pore pressure, practical construction problems, and permeability are discussed.
10.14359/3510
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