Special grouting material for anti-crack composite grouting pavement based on polymer modification and preparation method thereof

The invention discloses a special grouting material for an anti-crack composite grouting pavement based on polymer modification and a preparation method of the special grouting material. The special grouting material comprises ordinary Portland cement, fly ash, glass beads, aromatic oil, a water reducing agent, a retarder, redispersible latex powder, a water-retaining agent, a defoaming agent, a polymer surface modified calcium sulphoaluminate expanding agent, cellulose ether and water glass. The preparation method comprises the following steps: mixing the ordinary Portland cement, the fly ash, the glass beads, the cellulose ether, the water reducing agent, the retarder, the redispersible latex powder and the polymer surface modified calcium sulphoaluminate expanding agent to prepare a first mixture; and mixing the aromatic oil, the water-retaining agent, the defoaming agent and the water glass to obtain a second mixture, and independently packaging the second mixture. According to the grouting material, exce