Granulation of Fly ash Lightweight Aggregate and Accelerated Curing Technology


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Title: Granulation of Fly ash Lightweight Aggregate and Accelerated Curing Technology

Author(s): C. L. Hwang, R. Y. Lin, K. M. Hsu, and J. F. Chan

Publication: Special Publication

Volume: 132


Appears on pages(s): 419-438

Keywords: admixtures; autoclaves; catalysts; fly ash; granulating; lightweight aggregates; microwaves; steam curing; strength; Materials Research

Date: 5/1/1992

Class F fly ash was used as the basic granulating material. Catalysts and binders were added to evaluate the behavior of granulated material. The accelerated curing method was also considered. Results indicate that granulation rate depends closely on the slant angles of the disc, the revolving rate, the methods of adding admixtures, and granulation time. Though aluminum powder reduced unit weight and raised the strength of fresh particles, it had a detrimental effect on other properties. Addition of hydrophilic seed reduced the granulation time and increased productivity. The results showed that at a constant relative humidity, the higher the temperature, the more rapid and higher the strength development. It is important to maintain constant temperatures or low strengths may result. Normal steam curing, autoclave curing, and microwave steam curing have beneficial effects on the strength of fly ash lightweight aggregates. The differences in curing results are due to differences in mix proportioning of aggregates and duration of curing.