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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Upgrading of PFA for Utilization in Concrete
Author(s): H. A. W. Cornelissena and C. H. Gast
Publication: Special Publication
Appears on pages(s): 457-470
Keywords: aggregate gradation; air classification; concretes; fineness; fly ash; mortars (material); packing; PFA; thermal conductivity (K-factor); water-cement ratio; Materials Research
Abstract:To remove coarse PFA particles from bulk fly ash batches, a pilot plant air classifier was built and tested. This plant also enabled the production of fly ash gradings with various particle size distributions. The effect of upgrading by air classification on mortar and concrete properties was investigated in an extended research program. For that purpose, the PFA particle size distribution was expressed by the grading modulus, which proved to correlate well with fresh mortar and fresh concrete properties, as well as with strength and efficiency factors of the hardened materials. A simplified model for packing the dry components (fly ash, cement, and sand) of mortar was derived and applied. For the combinations investigated, mixes with coarser sized cement showed the highest packing density. A dense packing proved to be favorable for fresh mortar and hardened mortar properties.
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