Optimizing Chemical Admixtures for SCC

SCC was used for the Trump International Hotel and Tower in Chicago following the successful use of this technology during construction of the Burj Khalifa building in Dubai.

FIG 1. Basic conceptual understanding of how superplasticizers and VMAs impact yield stress (slump-flow) and viscosity (T20).

FIG 2. Impact of VMA to reduce the sensitivity of the mixture to change viscosity as a function of change in water content.

FIG 3. Optimizing the SCC Admixture System with the Workability Box. The superplasticizer and VMA dosages are incrementally adjusted to achieve a stable mixture with acceptable flow performance. Stability indicating results set the boundaries of slump-flow and T20 values where the mix is not expected to segregate.

TABLE 1. SCC Mixture Proportions

TABLE 2. Admixture Dosages and Test Results for Workability Box

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