球状化処理したホタテ貝殻を混入したセメントペーストの流動性評価 [in Japanese] Flowability of cement paste using spherical particles prepared from scallop shell [in Japanese]
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Fly ash, typically used in very high-strength concrete mixes, does several things. It increases workability at a given water-cement ratio because of its "ball-bearing" effect, thus allowing a reduction of mixing water. Upon recrystallization from a scallop shell dissolved in HNO_3 vaterite-type CaCO_3 particles precipitated as spherical crystals. Because vaterite particles are spherical shaped, they showed a ball bearing effect that allows concrete to be produced using less water. The flowability gain derived from 10 to 30% vaterite particles (by weight of cementitious materials) was comparable to that of cement containing fly ash.
- Research reports Hakodate Technical college
Research reports Hakodate Technical college (41), 57-61, 2007
Hakodate National College of Technology