Properties of Mortar Containing Ultra-Fine Fly Ash Particles


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Title: Properties of Mortar Containing Ultra-Fine Fly Ash Particles

Author(s): E. Tazawa

Publication: Special Publication

Volume: 132


Appears on pages(s): 79-96

Keywords: aluminum oxide; chemical analysis; compressive strength; diffusion; fly ash; mineral admixtures; mortars (material); porosity; pozzolanic reactions; silica; Materials Research

Date: 5/1/1992

Examines the utilization of ultra-fine particles originated from fly ash, when a part of cement is replaced with the particles. The ultra-fine particles mainly consist of amorphous silica and alumina, and specific surface area of these particles can be changed from 200,000 cmý/g to 1,300,000 cmýg. To study the pore structures of mortar containing those fly ash particles, water-cement ratio, replacement ratio of the particles, and period of standard curing were varied. The properties, such as rate of hydration, rate of strength development, chemical components dissolved out to various alkali solutions during early ages, and pore-size distribution were measured. These properties were compared with properties of the cement mortar containing silica fume, meta kaolin, or fly ash for similar mortar specimens. It is shown that compressive strength of mortar containing the ultra-fine particles developed with age, and the pore structure of the mortar was like that of mortar with fly ash. Chemical components dissolved out to the particles were different from those dissolved out by other mineral admixtures.