The invention relates to a preparation method of a
cement additive, which comprises the following steps: S1, selecting a mineral supplement, ultrafine
powder, an anti-
cracking agent, a reinforcing agent, a stabilizer and a
moisture regulator according to a set proportion; uniformly mixing the mineral supplement, the superfine
powder, the anti-
cracking agent and the reinforcing agent; adding a stabilizer and a
moisture regulator, and uniformly mixing; excessive
moisture is removed in a
vacuum drying mode; and carrying out particle size analysis on the treated
cement additive. By optimizing the proportion of the mineral supplement, the superfine
powder, the anti-
cracking agent, the reinforcing agent, the stabilizer and the moisture
regulator, the strength, the
crack resistance, the impermeability and the fluidity of
cement are improved, the compactness and the strength of the cement are improved by the nano-scale
silicon dioxide and the
calcium carbonate, the
crack resistance and the
toughness are improved by the anti-cracking agent and the reinforcing agent, the fluidity is improved by the stabilizer, and the strength of the cement is improved by the superfine powder. And the quality and uniformity of the cement additive are optimized by adopting
vacuum drying and particle size analysis, so that the construction quality is improved, and the service life is prolonged.