Consolidating concrete bridge structure applications

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SCC provides benefits beyond those of conventional concrete in all three aspects of sustainable development: economic, social, and environmental.

The most important benefit of SCC is the increase in durability.

When SCC is brought into the equation, the fresh properties are the most important characteristic of the mixture.

The concrete has to flow easily (slump flow) including passing through obstructions like rebar (measured by the J-ring test), but has to do so without bleeding or segregating.

While high doses of superplasticizers can create a very fluid concrete that flows readily, the concrete will segregate if the mortar is too thin to support the weight of the coarse aggregate.

The key to creating SCC, also referred to as self-compacting, self-leveling, or self-placing concrete, is to produce a very flowable mortar that retains a viscosity great enough to support the coarse aggregate.

This allowed the use of concrete having an 8-inch or greater slump; however, some vibration was still required for adequate consolidation.If a mixture is designed with gray portland cement, it can be modified to use white portland cement, but the mixture will most likely change somewhat.Testing done by Aalborg Portland A/S identified several suggestions for converting a gray SCC formulation to white cement SCC.Flowability, passing ability, and stability are three of the most important characteristics of SCC.In 2001, ASTM started development of test methods that would assess these characteristics.

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