This highly flowable, non-segregating concrete has many benefits. With a slump flow of 20 to 30 inches, self-consolidating concrete (SCC) spreads into place, fills your formwork and encapsulates the reinforcement without segregation or bleeding.
You don't need any mechanical consolidation – this versatile concrete consolidates under its own weight. As a result, you enjoy these advantages when using self-compacting concrete:
Better consolidation in congested areas
No vibrators or tamping needed
Enhanced job site safety
Additional detailing flexibility
Faster concrete discharge
Improved hardening properties
Self-Consolidating Concrete Applications
There are certain applications where using self-consolidating concrete is optimal. For example, it's used for beams and columns, foundations, pumped concrete and other applications where flowing concrete is beneficial to concrete placement. These days, architects are often tasked with creating unique and innovative structures. Concrete has a history of being a versatile material, and self-consolidating concrete has done much to solidify that position, particularly when it comes to architectural concrete.
Additionally, you can use SCC mixtures to mimic various formed surfaces, from wood textures to intricate carvings. Practically any element the architect and owner have in mind can be produced in self-consolidating concrete construction.
Self-Consolidating Concrete Testing
Four procedures are used in self-consolidating concrete testing to ensure it's ready to use at your job site. Whether you use a slump flow test, L-Box, J-Ring or V-funnel test, Certified MTP has all the testing apparatus you need.
Slump Flow Test
This SCC testing is conducted using a slump cone. You fill the cone, lift it up and measure the spread of the concrete. The spread should measure from 18 to 32 inches. You will also be looking at the leading edge of the spreading concrete to see whether there's any bleed water or if any aggregates accumulate at the center of the flow.
When testing for self-consolidating concrete, you'll also need to measure the time it takes for the concrete to reach the 20-inch diameter spread after you lift the slump cone. For SCC, it typically takes from two to ten seconds. It takes longer for a more viscous mix, which would be used for congested reinforcement or deep areas. Shorter times indicate a more fluid mixture that needs to flow across larger expanses without obstruction.
Another method of SCC testing is the V-funnel test. It determines how quickly self-consolidating concrete passes through a constricted area. The funnel opening is set to a specific size. You pour the concrete into the funnel and measure the time it takes to flow through the opening at the bottom.
A variation of the slump flow test, the J-ring uses a simulated rebar cage that surrounds the slump cone. You then evaluate the ability of the self-consolidating concrete mix to spread past the cage without segregation.
This SCC testing is used for product development or prequalification. The L-Box test is performed by pouring concrete into one side of the box, then opening a gate to let the concrete flow through the opening on the opposite side, which contains simulated rebar. The depth of the concrete is then measured. The proportional difference is the blocking ratio. (Some tests are performed by timing the flow with a stopwatch.)
Frequently Asked Questions About Self-Consolidating Concrete
Here are some of the commonly asked questions about SCC. If you don't see an answer to the question you have, please contact us and let us know how we can help.
Is Self-Consolidating Concrete More Expensive?
Yes, SCC mixtures are generally more costly than conventional concrete. However, you'll save in other ways, including reduced labor costs, shorter construction times and less wear and tear on your equipment. Plus, you'll enjoy more flexibility – so the added cost of an SCC mix is well worth it.
How Long Has SCC Been Used in Construction?
Self-consolidating concrete was developed by Japanese researchers in the late 1980s.
What Is Needed to Produce Self-Consolidating Concrete?
Essentially, SCC needs to have low-yield stress and high viscosity to ensure it suspends aggregate particles without segregation, excessive bleeding/air migration or paste separation.
Certified MTP Has the Reliable Self-Consolidating Concrete Equipment You Need for Testing
Testing concrete to ensure it's properly proportioned for optimal performance is an essential task on any construction site. Make sure your self-consolidating concrete is up to speed with high-quality SCC testing products. Certified MTP proudly supports those who work in the concrete industry with testing equipment and other essentials. For all the concrete testing equipment you need, shop Certified MTP today!
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