Magnesium oxychloride cement-based composite material and preparation method thereof: Fid-Bau Portal

Magnesium oxychloride cement-based composite material and preparation method thereof

MA LEI / LIU ZHEN / XIAO JINBIN / ZHAO HUITING / XIE MEIZHU / DONG LONGHAO

The invention belongs to the technical field of cement-based composite materials, and particularly relates to a magnesium oxychloride cement-based composite material and a preparation method thereof.The magnesium oxychloride cement-based composite material takes silica sol coated straw as a component of the magnesium oxychloride cement-based composite material; the straw fibers added into the magnesium oxychloride cement material are cross-linked and stacked, so that the breaking strength of the composite material can also be improved, and meanwhile, nano silicon dioxide in the silica sol can be used as a filler to be filled in pores of a magnesium oxychloride cement hydrated crystal phase and capillary pores formed by the straws, so that the effects of blocking water absorption and erosion are achieved, and the water absorption and erosion resistance of the composite material are improved. Therefore, the water resistance and the strength of the straw magnesium oxychloride cement composite material are improved. Meanwhile, the silica sol forms a layer of silicon oxide film on the surface of the straw, so that the bonding performance of the straw and a magnesium oxychloride cement material is improved, and the strength and the water resistance of the material can also be improved.

本发明属于水泥基复合材料技术领域，具体涉及一种氯氧镁水泥基复合材料及其制备方法，本发明以硅溶胶包覆秸秆作为氯氧镁水泥基复合材料的组分，由于秸秆中富含纤维，添加到氯氧镁水泥材料中秸秆纤维的交联堆叠也能提高复合材料的抗折强度，同时硅溶胶中的纳米二氧化硅可作为填充物，填充在氯氧镁水泥水化结晶相的孔隙和秸秆形成的毛细孔中，起到阻碍水吸入和侵蚀的作用，从而提高秸秆氯氧镁水泥复合材料的耐水性和强度。同时，硅溶胶在秸秆表面形成一层氧化硅膜，增加其与氯氧镁水泥材料的粘结性能，也能提高材料的强度及耐水性能。

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