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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 46 Abstracts search results
Document:
SP149-44
Date:
October 1, 1994
Author(s):
G. C. Hoff
Publication:
Symposium Papers
Volume:
149
Abstract:
The use of high-strength lightweight concrete (HSLWC) in offshore oil and gas platforms is becoming more common. The constant wave action on these structures imposes continual fatigue loading on the concrete. Paper reviews previous research on both compressive and flexural fatigue behavior of HSLWC. The fatigue behavior of HSLWC is comparable or somewhat better than high-strength normal-density concrete (HSNDC) tested under the same conditions. The cyclic strain behavior of HSLWC is significantly different than for HSNDC and there is little change in strain behavior with increasing cycles of load until failure occurs. The fatigue life is reduced when the concrete is tested in submerged conditions. There is no significant difference between the S-N curves for reinforced and nonreinforced concrete. The mechanism that causes HSLWC to have comparable or better performance than HSNDC is attributed to the improved microstructure of the matrix-aggregate interface. This improvement reduces microcracking that typically leads to fatigue damage. The effect of crack blocking by sea salt depositions is discussed.
DOI:
10.14359/4286
SP149-45
J. J. Schemmel, , M. L. Leming, and M. R. Hansen
A 4-year study, conducted by a consortium of three universities, on the use of high-performance concrete in highway applications was recently completed. A major goal of this research project was to determine if high-performance concrete mixes could be successfully produced in the field. In addition, an evaluation was to be made of the long-term performance of this concrete under field service conditions. Field installations were constructed in five states for this purpose. Paper provides potential users of high-performance concrete with general recommendations and guidelines for production and placement.
10.14359/4294
SP149-03
G. C. Hoff, R. Walum, R. Elimov, and H. R. Woodhead
The Hibernia offshore concrete platform is being constructed in Newfoundland, Canada, and will be used in hydrocarbon production on the Grand Banks off the east coast of Canada. The 111-m tall concrete structure will contain approximately 165,000 m 3 of high-strength concrete. Construction of the concrete platform through 1993 consisted of a 108-m-diameter base slab that rested on a series of precast and cast-in-place concrete skirts. Specified 28-day compressive strengths (cylinder) for the skirts and base slab were 49 and 69 MPa, respectively. Actual average compressive strengths achieved were73.8 and 81.7 MPa, respectively. The remaining construction will be completed by 1996. The use of two different concrete production systems and their results are described.
10.14359/4254
SP149-16
N. Maruyama, M. Yurugi, H. Konishi, and Y. Murahashi
When a damaged concrete slab is repaired, new concrete will generally be placed in a downward direction. Form panels must be set up first under the damaged concrete slab, and then concrete must be placed between the form panels and the damaged slab. However, compaction by vibrator is needed in most concrete (slump: 8 to 21 cm), and therefore concrete placement under a damaged slab that needs repair is impossible realistically. A repair method using high-performance concrete without vibration or compaction was developed. The method was applied to the repair of concrete slabs that had been damaged by heat. It was confirmed that this repair method was easier and that repair was possible while the slab was in use. In addition, the costs and construction period were reduced greatly by this repair method.
10.14359/4255
SP149-43
C. T. Thornton
The twin 450-m Petronas Towers under construction in Kuala Lumpur City Centre, Malaysia, are discussed. These world's tallest buildings use concrete columns, ring beams and a core of 40- to 80-MPa cube strength concrete, and steel long-span floor beams. Benefits of high-strength concrete are discussed, including occupant comfort achieved using mass-to-length building period and high inherent damping to reduce building response, high lateral stiffness, simple monolithic cast in situ connections, reasonable member sizes, local labor use, and light erection equipment. Special design features include deep barrette foundations acting in friction, temperature control measures for a massive mat pour, treatments at stepped and sloping columns, and use of haunched beams to accommodate mechanical ducts. The construction approach to creep and shrinkage is also discussed.
10.14359/4256
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