Evaluation of self consolidating concrete for bridge structure applications

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The former is rather long as it involves the determination of the relative coarse aggregate content at four sections along a concrete column.For field use, this may be substituted by determining the relative coarse aggregate content at the top and bottom sections only.The surface settlement test is rather long for use as a quality control test in the field.Instead, the rate of settlement after 30 min can be determined.Self-consolidating concrete (SCC) is a relative new class of high-performance concrete that is able to flow and consolidate under its own weight, completely fill the formwork even in the presence of dense reinforcement, whilst maintaining homogeneity, and without the need for any additional compaction [1,2].SCC mixtures designated for prestressed applications should be highly workable to flow easily through restricted spacing and completely encapsulate reinforcements without any mechanical vibration [2].In total, 33 self-consolidating concrete (SCC) mixtures made with various mixture proportioning parameters, including maximum size and type of aggregate, type and content of binder, and w/cm were evaluated.Correlations among various test results used in evaluating the workability responses are established.

It is recommended to complement the Visual Stability Index (VSI) test with a quantitative test, such as the column segregation or surface settlement test.: Adequate selection of material constituents and test methods are necessary for workability specifications and performance of hardened concrete.An experimental program was performed to evaluate the suitability of various test methods for workability assessment and to propose performance specifications of prestressed concrete.It is recommended that SCC should have slump flow values of 635–760 mm.To ensure proper filling capacity greater than 80%, such concrete should have a passing ability that corresponds to L-box blocking ratio (h) ≥ 0.5, J-Ring flow of 570–685 mm, slump flow minus J-Ring flow diameter ≤75 mm.In general, these methods include the components required for evaluating simultaneously deformability, passing ability, and resistance to segregation, since these properties are rather interrelated.

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