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Title: Self-Compacting Concrete (SCC) Made from Supersulfated Cements (SSC)

Author(s): Jefferson T. O. Homrich, Letícia Volkweis, Julia Beatriz Milani, Guilherme Holub Camargo, Caroline Angulski da Luz, and José Ilo Pereira Filho

Publication: Symposium Paper

Volume: 326


Appears on pages(s): 36.1-36.8

Keywords: supersulfated cement, self-compacting concrete, ettringite, heat oh hydration, shrinkage, expansion

DOI: 10.14359/51711018

Date: 8/10/2018


Considerable attention has been given to special cements, capable of reducing CO2 emissions, energy and limestone consumption. Supersulfated cements (SSC) are primarily comprised of blast-furnace slag, (90-80%), calcium sulfate (10-20%) and an alkaline activator, which is often Portland cement, though in a relative small quantity (around 5%) or hydroxide (KOH). Besides requiring less energy and greenhouse gas emissions in its production, supersulfated cement (SSC) can provide a lower heat of hydration and lower shrinkage. These characteristics are desired mainly in self-compacting concrete (SCC) whose consumption of cement is high, then it is subject to present a higher heat of hydration. The goal of this paper was to study the suitability of supersulfated cement to produce a self-compacting concrete. Therefore, SSC was obtained from 85 % of GBFS, 15% of calcium sulfate (phosphogypsum) and 5% of Portland cement. The concrete was produced and investigated in relation to fluidity properties, heat of hydration, length variation and compressive strength at 7 and 28 days. A sample of SCC made with Portland cement with a lower heat of hydration was also made as comparison. The results showed that SCC made with SSC presented a lower compressive strength but showed better fluidity properties, a lower heat of hydration and no shrinkage.