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ACI 237R 07 2007

ACI 237R 07 2007

$35.48

237R-07 Self-Consolidating Concrete

Published By Publication Date Number of Pages
ACI 2007 34
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Self-consolidating concrete (SCC) has been successfully used in many projects around the world and has made a major impact on concrete placement and construction economics. This report contains the current state of knowledge with respect to SCC. The information in this document is expected to inform concrete producers, users, and specifiers of SCC of known practices and processes. Because SCC is a viable solution to various concrete placement problems, ASTM has established Subcommittee C09.47, Self-Consolidating Concrete, to develop standard test methods for SCC. Keywords: admixture; aggregate; air entrainment; bleeding; ement;consolidation; curing; placing; self-consolidating concrete; specification;viscosity, workability.

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PDF Pages PDF Title
3 CONTENTS
4 CHAPTER 1— INTRODUCTION
1.1— Definition of self- consolidating concrete (SCC)
1.2—Advantages
5 1.3—Development history of SCC
1.4 — Selected case studies
11 CHAPTER 2— FRESH PROPERTIES
2.1— Terminology relative to SCC
2.2—Performance requirements of SCC
2.3—General
12 2.4—Characteristics
13 2.5—Target guidelines for fresh properties
2.6—Quality control
14 CHAPTER 3— HARDENED PROPERTIES
3.1— General
3.2—Mechanical properties
3.2.1 Compressive strength
3.2.2 Flexural strength
15 3.2.3 Modulus of elasticity
3.2.4 Autogenous, drying, and plastic shrinkage
3.2.4.1 Autogenous shrinkage
3.2.4.2 Drying shrinkage
3.2.4.3 Plastic shrinkage
3.2.5 Creep in compression
16 3.2.6 Bond to reinforcing steel and prestressed strand
3.3—Long-term durability
3.3.1 Resistance to freezing and thawing and deicer salt scaling
3.3.1.1 Air-void system
3.3.2 Paste microstructure
3.3.3 Resistance to carbonation
3.4—Aesthetics
CHAPTER 4— GUIDE FOR SELECTING PROPORTIONS FOR SCC
4.1— General
17 4.1.1 Mixture proportion methodology
4.2—Performance requirements
4.2.1 Test age
4.3—Materials
4.3.1 Cement
4.3.2 Finely divided powders and supplementarycementitious materials
18 4.3.2.1 Silica fume
4.3.2.2 Fly ash
4.3.2.3 Ground-granulated blast-furnace slag
4.3.3 Aggregate selection
4.3.3.1 Fine aggregate
4.3.4 Admixtures
4.4—Mixture proportioning procedure
19 4.4.1 Establishing coarse aggregate content
4.4.1.1 Coarse aggregate content for Category I
4.4.1.2 Coarse aggregate content for Category II
4.4.2 Powder and water content
4.4.3 Paste and mortar volume
20 4.5—Examples of SCC mixture proportions
CHAPTER 5— PRODUCTION
5.1— General
5.2—Production issues that influence fresh SCC properties
5.2.1 Raw materials
5.2.2 Batching and mixing
21 5.3—Performance targets
5.3.1 Fresh properties
5.3.2 Hardened properties
5.3.3 Tolerances
5.3.4 Mixture robustness
5.3.5 Fluidity instability
5.4—Mock-up
5.4.1 Test pieces
5.4.2 Diagnostic analyses
5.4.3 Confirm mixture performance through performance
history
5.5—Employee training
5.5.1 Quality control
5.5.2 Quantitative and qualitative analyses
5.5.3 Production personnel
22 CHAPTER 6— TRANSPORT, PLACEMENT, AND FINISHING
6.1— General
6.2—Transport
6.2.1 Transit mixer
6.2.2 Hopper or bucket
6.2.3 Pump
6.3—Discharge of SCC for slabs or open-top molds for factory- type precast elements
23 6.4—Formwork, element characteristics, and reinforcement
6.4.1 Form characteristics
6.4.1.1 Form pressure
6.4.2 Element shape intricacy
24 6.4.3 Element depth
6.4.4 Element length and width
6.4.5 Element size
6.4.6 Surface finish
6.4.7 Degree of reinforcement
6.5—Placement techniques
6.5.1 Double tee production
6.5.2 Beams
25 6.5.3 Slabs
6.5.4 Modules and walls
6.5.5 Vertical columns
6.5.6 Horizontal columns
6.5.7 Freefall
6.6—Finishing
6.6.1 Double tees
6.6.2 Slabs
26 6.7—Curing
6.7.1 Accelerated curing
CHAPTER 7— SCC SPECIFICATION GUIDELINES
7.1— Concrete materials
7.1.1 Cementitious material
7.1.2 Aggregates
7.1.3 Admixtures
7.2—Execution
7.2.1 Transportation and handling
7.2.2 Forms and placement
7.2.3 Protection and curing
CHAPTER 8— TEST METHODS
8.1— Measuring SCC characteristics
27 8.2—Slump flow
8.2.1 Summary of test
8.2.2 Interpretation of results
8.3—Visual stability index
8.3.1 Summary of test
8.3.2 Interpretation of results
8.4—T50
8.4.1 Summary of test
8.4.2 Interpretation of results
28 8.5—J-ring
8.5.1 Summary of test
8.5.2 Interpretation of results
8.6—L-box
8.6.1 Summary of test
8.6.2 Interpretation of results
8.7—Column segregation
8.7.1 Summary of test
8.7.2 Interpretation of results
29 8.8—Other tests
CHAPTER 9— REFERENCES
9.1— Referenced standards and reports

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ACI 237R 07 2007
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