Anti-Solidification Technology for Fine Aggregate from Blast Furnace Slag

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Title: Anti-Solidification Technology for Fine Aggregate from Blast Furnace Slag

Author(s): H. Mitsufuji, C. Yoshizawa, T. Takahashi, and M. Kinoshita

Publication: Special Publication

Volume: 221

Issue:

Appears on pages(s): 605-616

Keywords: anti-bonding agent; concrete; fine aggregate; grain size; granulated blast furnace slag; hydration reaction; natural sand; sodium gluconate; solidification; storage

Date: 5/1/2004

Abstract:
A shortage of high quality natural sands and the environmental restrictions make the artificial aggregate to be used more available and more attractively for concrete industry. The fine aggregate of blast furnace slag, which is manufactured by grinding granulated slag, is similar in physical properties to natural sands. However, the aggregate grains are easily bonded together and hardened by hydration reaction, during storage. The authors have developed an anti-bonding agent that can extend the storage term safely more than 2 times, compared with the addition of conventional sodium gluconate to the aggregate. The performance was assessed by measuring aggregate grain size after various periods of curing at temperatures between 40 to 80°C in laboratory and was also confirmed by piling the aggregate outdoors in summer season. The effects of the agents on concrete properties were negligible.