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- W569838289 abstract "This Innovations Deserving Exploratory Analysis (IDEA) project adapted the self-compacting concrete technology for the U.S. market using domestic concrete materials and practice for use in highway structures. The experimental work focused on designing self-compacting concrete mix formulations with desired workability, segregation resistance, and deformability as well as testing for standard mechanical properties of the hardened concrete. Following a literature review, materials and equipment were selected and laboratory tests were performed to determine formulations that satisfied the filling and passing requirements for self-compacted concrete. All selected formulations contained fly ash and a superplasticizer. Tests on fresh mixes confirmed the flowability required for self-compacting concrete. However, the concrete mixes showed sensitivity to the mixing sequence. Consequently, tests were conducted to establish a mixing sequence for producing the most reliable and consistent results. Compressive strength tests showed rapid gain in strength: 3-day strengths approximated 80% of the 28-day strengths. The 28-day compressive strengths were almost 100% higher than those for conventional concrete. The modulus of elasticity tests showed an increase of about 30-45% over conventional concrete. The freeze-thaw resistance tests showed durability factors in the range of 87-98%. The segregation tendency of self consolidating concrete can be controlled by controlling the amount of superplasticizers. The higher unit cost of self-consolidating concrete (about 50% higher than conventional concrete) is largely offset by the use of less material and increased durability." @default.
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- W569838289 date "2005-08-01" @default.
- W569838289 modified "2023-09-27" @default.
- W569838289 title "US Specific Self Compacting Concrete for Bridges" @default.
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