详情

Structural Applications of Self-Consolidating Concrete

项目名称：	Structural Applications of Self-Consolidating Concrete
摘要：	The South Dakota Department of Transportation (SDDOT) recently submitted a successful application for funding from the Federal Highway Administration's Innovative Bridge Research and Construction Program (IBRC). The application proposed laboratory evaluation of Self Consolidating Concrete (SCC) mixture designs for use in precast and cast-in-place box culverts and other structural applications. SCC is a specially proportioned hydraulic cement concrete that flows easily into forms and around reinforcement without segregation. Use of this type of concrete for the manufacture of precast elements provides the benefits of increased rate of production, safety and reduced labor needs. These same benefits apply to cast-in-place construction, especially with closely spaced reinforcing steel, which can cause problems with concrete consolidation. In spite of its benefits and widespread use in Japan and Europe, the use of SCC in the United States has been limited because of concerns about certain design and construction issues that are perceived to influence the structural integrity of the structural element. These issues include workability, strength development, creep and shrinkage properties, durability, and other factors that influence constructability and performance. SDDOT needs to determine SCC mix designs with materials that are specific to South Dakota. There is also a need to determine if there are potential constructability and production issues. If it is determined that SCC can be used with no detrimental effects or production issues, then recommendations for its use need to be developed. Research is needed to verify that the use of SCC is advisable in these applications and does not create performance issues with respect to durability, surface finish, placement, scaling, or functional requirements of hardened concrete. The objectives of this research project are to: (1) evaluate the feasibility and performance of SCC for use in cast-in-place and precast concrete products; and (2)develop draft specifications, acceptance criteria, mix qualifications, and guidelines for use of SCC by SDDOT. Research tasks for this project are as follows: (1) Review literature regarding SCC practices in other state transportation departments and industry and report results to technical panel. (2) From literature review determine if shrinkage and creep testing should be done and what methods would be appropriate for use with cast-in-place and precast box culvert construction. (3) Meet with the technical panel to review project scope and work plan and provide minutes of meeting to technical panel. (4) Develop mix design performance objectives for use in evaluating performance of SCC mixes in laboratory as well as field construction and present to technical panel for approval prior to beginning Task 5. (5) Through collaboration with the precast and ready-mix industry, propose SCC mix designs for South Dakota materials for precast and cast-in-place concrete products. Include a quartzite mix and a limestone mix for use by precasting plants as well as mixes for use by ready-mix producers. (6 )Verify through small batch production four mix designs identified in Task 5 using slump flow with VSI (visual stability index), J-ring, L-box, column segregation, and hardened cut cylinders in addition to standard fresh concrete property tests. Mixes should be adjusted and retested as required to meet objectives identified in task 4. (7) Conduct on site construction inspection of four separate construction projects that will have a portion of the project constructed with one of the four SCC mix designs tested in Task 6. Slump flow with VSI (visual stability index ), J-ring, and wet concrete property tests will be used for acceptance to place concrete into forms. Hardened cut cylinders will be used to determine aggregate distribution. Mixes will meet objectives identified in Task 4. [SDDOT will arrange to get concrete on four projects--two precast and two cast-in-place]. (8) By November 20, 2006 provide an interim report including draft specifications, mix qualification, acceptance criteria, and guidelines for use, based on completion of one cast-in-place and one precast project in Task 7. (9) Develop evaluation criteria--including constructability, cost, quality, safety, durability, and other appropriate factors--for using SCC in South Dakota. (10) Conduct on site construction inspection and field inspection after one winter in service on one cast-in-place and one precast box culvert project. Both projects will use SCC concrete for the entire length. SDDOT will identify projects at a later date. (11) Conduct on site pre-construction and construction inspection of one cast-in-place and one precast box culvert project using standard mix design. SDDOT will provide list of projects at a later date. (12) Evaluate the two box culvert projects constructed in Task 10 by comparing to precast and cast-in-place box culverts constructed in Task 11 and using criteria identified in Task 9. (13) Review and refine draft specifications for use of SCC in SDDOT including mix qualification, acceptance criteria, and guidelines for use based on additional information gained in Task 8. (14) Prepare a final report and executive summary of the literature review, research methodology, findings, conclusions and recommendations. (15 Make an executive presentation to the SDDOT Research Review Board at the conclusion of the project.
状态：	Active
资金：	65000.00
资助组织：	Federal Highway Administration
项目负责人：	Brueggeman, Pat；Ormesher, Daris
执行机构：	South Dakota State University, Brookings
开始时间：	20060526
实际结束时间：	20100630
主题领域：	Bridges and other structures；Highways；I30: Materials