Aci self consolidating concrete
Self consolidating concrete (SCC) is highly flowable, non segregating concrete that can spread into place, fill the formwork, and encapsulate the reinforcement without any mechanical consolidation (ACI 237).
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Lack of consolidation can cause voids, rock pockets, honeycombing, and poor bonding with the rebar.
In extreme cases, improper consolidation can affect the structural integrity of the walls.
This report contains the current state of knowledge with respect to SCC.Keywords: admixture; aggregate; air entrainment; bleeding; ement;consolidation; curing; placing; self-consolidating concrete; specification;viscosity, workability.Chapter 1—Introduction1.1—Definition of self-consolidating concrete (SCC)1.2—Advantages1.3—Development history of SCC1.4—Selected case studies Chapter 2—Fresh properties2.1—Terminology relative to SCC2.2—Performance requirements of SCC2.3—General2.4—Characteristics2.5—Target guidelines for fresh properties2.6—Quality control Chapter 3—Hardened properties3.1—General3.2—Mechanical properties3.3—Long-term durability3.4—Aesthetics Chapter 4—Guide for selecting proportions for SCC4.1—General4.2—Performance requirements4.3—Materials4.4—Mixture proportioning procedure4.5—Examples of SCC mixture proportions Chapter 5—Production5.1—General5.2—Production issues that influence fresh SCC properties5.3—Performance targets5.4—Mock-up5.5—Employee training Chapter 6—Transport, placement, and finishing6.1—General6.2—Transport6.3—Discharge of SCC for slabs or open-top molds for factory-type precast elements6.4—Forms, element characteristics, and reinforcement6.5—Placement techniques6.6—Finishing6.7—Curing Chapter 7—SCC specification guidelines7.1—Concrete materials7.2—Execution Chapter 8—Test methods8.1—Measuring SCC characteristics8.2—Slump flow8.3—Visual stability index8.4—T508.5—J-ring8.6—L-box8.7—Column segregation8.8—Other tests Chapter 9—References9.1—Referenced standards and reports9.2—Cited references Any applicable errata are included with individual documents at the time of purchase.They also filled test panels with a self-consolidating concrete (SCC).In every case, walls filled with low-slump mixes had poor consolidation, regardless of the technique used.
The information in this document is expected to inform concrete producers, users, and specifiers of SCC of known practices and processes.