Self Consolidating Concrete designing criteria and test methods

1. Self Consolidating Concrete
By
Jeewapriya Alahakoon
Chemical Division
St.Anthony’s Hardware (Pvt) Ltd

2. Section - II
• Designing of SCC
• Test Methods of SCC

3. Designing Of SCC
• Parameters
– Properties of Hardened Concrete
• Same as conventional concrete design (E.g.; Strength )
• Fulfill BSEN 206 / BS5328 / ACI or any other accepted standards
• Filling ability
• Passing ability
• Stability
☻ A Concrete mix only be classified as SCC if the above
all properties are satisfied.
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- Properties of Fresh Concrete

4. SCC Rheology
Conflict between high flow & Segregation resistance
PCE
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V
M
A

5. Important parameters for successful
SCC mix
Coarse Agg; Content – 25%- 35% from concrete volume
Paste Fraction – 35% - 37%
Powder Content or W / P ratio
Fine Agg; Content – 45% - 55% of FA / Total Agg;
Low W/C
Air Content – can improve viscosity properties
HRWR Admixture e.g. ADVA
VMA e.g. Vmar10p
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6. Important parameters for successful
SCC mix
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H R W R + VMA

7. Steps to Successful SCC mix
1. Determine required Slump-Flow
2. Select of CA & FA proportions
Estimate required Powder & Water content
Select Admixture
Trial Batch
Test
Adjust mix proportion based on test result
Repeat steps 5-7 as necessary
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8. Properties Selection Guidance
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9. Testing Methods Of SCC
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10. Testing Methods Of SCC

11. Slump Flow Test
•ASTM C 1611
•ACI 237 Committee report –
Common range 450mm – 750mm
•Abram’s cone – ASTM C143/C143M
•Base plate – 900mm x 900mm
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12. SCC Flow Rate Test (T500) – ASTM-C1611
•Time takes to reach
500mm(20”) diameter
•Typical Value 2 – 5 Sec;
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13. SCC- J-Ring Test – ASTM C1621
•Limited to concrete with Max Agg; size of
25 mm.
•J-Ring
25mm thick, 300mm diameter rigid ring.
Max-16mm diameter, 100mm height rods in equal
space.
(SFT value – J-Ring test value) < 50mm
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14. Other Tests
L- Box Test
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U – Box Test
Rheometer

15. Visual Stability Index (VSI) Test
ASTM-C1611
BEST
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WERST

16. Why VSI ?
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17. Requirements for SCC
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18. References
National Ready mix Concrete Association, CIP-37, SCC, 2004.
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EFNARC, UK, Specification & Guideline for SCC, February 2006.
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Eric. P. Koehler, David. W. Fowler, Center for Transportation Research,
The University of Texas, TX-DOT, Project-0-5134, SCC for Pre-cast
Structural Application, August 2007.
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G.DE. Schutter, Guidelines for testing fresh SCC, September 2005.
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W.R. Grace & Co; North American Customer Service, Technical Bulleting,
2005.
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W.R. Grace & Co; High Performance Concrete, 15, December 2006.
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Prof. Wallervik.O.H , Rheology, My Way of Life, 36th Conference on Our
World in Concrete & Structure, Singapore, August 2011.
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Chuah.K.P. , Elementis Rheological Additives, 2004.
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19. Chemical Division
St.Anthony's Hardware (Pvt) Ltd;
January 2013