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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 27 Abstracts search results
Document:
SP159-13
Date:
February 1, 1996
Author(s):
Erik J. Sellevold
Publication:
Symposium Papers
Volume:
159
Abstract:
Practical use of high-strength concrete in Norway has shown that it is susceptible to cracking at early ages and that it normally is subjected to high curing temperatures due to high cement contents. The paper summarizes the results of a number of investigations at The Norwegian Institute of Technology and SINTEF research institute, both in Trondheim, Norway. The topics are: (1) early volume changes in the binder phase and early cracking sensitivity of high-performance concrete; and (2) the consequences of elevated curing temperatures on pore structure characteristics, permeability to chloride, and frost resistance of high- performance concrete.
DOI:
10.14359/1382
SP159-15
Claus V. Nielsen
Approximately 30 direct tensile tests have been performed on so-called Compresit matrix. This matrix is based on micro silica particles compacted in between the cement particles. The dense matrix, which shows high brittleness, is provided with ductility by means of steel fibers mixed randomly with respect to both position and orientation. Compressive strengths reaching 200 MPa are experienced with this particular matrix. The fiber reinforcement index is varied throughout the test series by means of three different fiber geometries and contents. Besides a plain mix without any fibers, the fiber reinforcement index is varied from 0.9 to 3.6, which is a wide range compared to other fiber reinforced concrete investigations. The test results consist of measured bridging stresses versus crack widths after the initiation of the first crack. A micro-mechanical model developed by V.C. Li, et al., is evaluated and compared to the results. This model agrees with low and moderate contents of both steel fibers and synthetic fibers. It is concluded that the micro-mechanical prediction does not seem to be sufficient to model the post-crack behavior of high-strength matrix reinforced with high amounts of steel fibers. However, the post-crack strength provided by the fibers crossing a crack plane is modeled satisfactorily.
10.14359/1384
SP159-03
D. A. St. John; L. C. McLeod; and Neil B. Milestone
DSP mortar bars used to measure volume changes as a result of exposure to wetting and drying have expanded and failed. Petrographic investigation showed that the failures have occurred due to alkali-aggregate reaction of undispersed agglomerates of silica fume. Investigation of the particle size ranges and dispersiblity of a range of silica fumes showed that they were all agglomerated to varying degrees and that the dispersibility is dependent on source and age of the silica fume. It is concluded that unless silica fume can be adequately dispersed in DSP materials there will be a potential for alkali-aggregate reaction to occur where the exposure conditions involve wetting and drying.
10.14359/1395
SP159-08
B. Vijaya Ranigan
High Performance/High Strength Concrete (HPC/HSC) has been used in a number of projects in Australia. Research on HPC/HSC is currently in progress in a number of centers around the country. The author and his research team at Curtin University have been engaged in research on the behavior and the strength of HPC/HSC structural members for the past five years. The research comprises experimental and analytical studies on columns under eccentric compression, structural walls subjected to horizontal and vertical loads, shear strength of beams, bond strength and bar splice lengths, and concrete-filled steel tubular composite columns. The test specimens were made using the HPC/HSC supplied by a commercial ready mix plan in Perth, Western Australia. The research was funded by the Australian Research Council Grants and by the industry. This paper summarizes the application of HPC/HSC in Australia, the current research at Curtin, and the future research needs.
10.14359/1397
SP159-07
W. G. Ryan and R. J. Potter
Australia is a dry warm continent. The major population centres are located close to the coastline. This paper examines the predictions for future building and construction activity in Australia. Based on the physical situation, for example climate and geography, and the anticipated needs for HPC arising from the forecast trends in construction activity it tries to forecast the research needs for HPC in Australia. It also endeavours to assign priorities for these research needs in terms of the size of the market likely to be affected.
10.14359/10051
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