Fly ash, cement composition, and production method for fly ash
A fly ash, volume technology, applied in cement production, solid waste removal, solid waste management, etc., can solve the problems of reduced fluidity, difficulty in improving operability, etc., so as to suppress the decrease in fluidity and improve operability. , the effect of suppressing uneven color
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Embodiment 1～5
[0081]Using fly ash obtained from a coal-fired power station in Comparative Example 1 as a raw material fly ash, a wind classifier (product name: turbine classifier, manufactured by Nissin Engineering Co., Ltd.) was used to remove at least a part of particles with a particle diameter of 45 μm or more, Make the content of particles with a particle diameter of 45 μm or more measured by the laser diffraction scattering particle size distribution measurement method in 100% by volume of the whole fly ash be less than 38% by volume, and then remove at least a part of the particles with a particle diameter of less than 5 μm, so that The content of particles with a particle size of less than 5 μm measured by the aforementioned measurement method was 12% by volume or less, and the fly ash for cement mixing of Example 1 having the laser diffraction particle size distribution shown in Table 1 was produced.
Embodiment 6～7
[0083] Using the fly ash obtained from the coal-fired power plant of Comparative Example 2 as the raw material fly ash, Examples 6 to 7 having the laser diffraction particle size distribution (volume %) shown in Table 1 were produced in the same manner as in Examples 1 to 5. Fly ash for cement mixing.
Embodiment 3
[0148] Example 3 is a cement composition using fly ash with a particle size of less than 5 μm and a content of 3.0% by volume or less. Both the paste flow rate and the mortar flow rate exceed 165 mm, and the fluidity is further improved.
[0149] In addition, as shown in Table 1, the content of particles with a particle diameter of 45 μm or more measured by the laser diffraction scattering particle size distribution measurement method is less than 38% by volume, and the content of particles with a particle diameter of less than 5 μm measured by the aforementioned measurement method The cement pastes containing the fly ash of Examples 1 to 7 with a content of 12% by volume or less had smaller ΔL values and ΔEab values than cement pastes using the fly ash of Comparative Examples 1 to 6, and color unevenness was confirmed. get suppressed.
[0150] As shown in Examples 1 to 4, for cement pastes using fly ash with a particle size of 45 μm or more in an amount of 35% by volume o...
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