Concrete material for building 3D printing and preparation method thereof

The invention relates to a concrete material for building 3D printing and a preparation method thereof. The concrete material comprises a powdery cementing material and aggregate, the powdery cementing material comprises cement, a mineral admixture, a thickening time control agent, a water reducing agent, a defoaming agent, polymer rubber powder, a thixotropic agent and fibers, and the aggregate is quartz sand. The concrete material for building 3D printing provided by the invention is good in construction performance, simple and convenient to operate, long in opening time, excellent in constructability, relatively high in early strength and good in mechanical property and crack resistance, and after the material is printed and molded, the surface is relatively fine and smooth and has no obvious sand grain feeling. 本发明涉及一种用于建筑3D打印的混凝土材料及其制备方法。其混凝土材料包括粉状胶凝材料和骨料，所述粉状胶凝材料包括水泥、矿物掺合料、调凝剂、减水剂、消泡剂、聚合物胶粉、触变剂和纤维，所述骨料为石英砂。本发明提供的用于建筑3D打印的混凝土材料施工性能好，操作简便，开放时间长，具有优良的可建造性能、较高的早期强度、和良好的力学性能及其抗裂性能，该材料打印成型后，表面较为细腻，无明显沙粒感。