The invention discloses an anti-seepage recycled concrete and a preparation method thereof, and relates to the technical field of building materials. The anti-seepage recycled concrete is prepared from the following raw materials in parts by weight: 75 to 85 parts of ordinary
Portland cement, 50 to 60 parts of natural fine aggregate, 90 to 100 parts of modified recycled coarse aggregate, 8 to 10 parts of
fly ash, 1 to 2 parts of polycarboxylate water reduction agent, 8 to 12 parts of
sodium gluconate, 5 to 6 parts of nanometer carbon
fiber, and 35 to 45 parts of water. The preparation method of the modified recycled coarse aggregate comprises the following steps of (1) crushing the waste concrete into the aggregate with size of 5 to 40 mm, cleaning the crushed aggregate by water, and naturally airing, so as to obtain the dried aggregate; (2) uniformly mixing a penetrant, nanometer
titanium dioxide and water to form a modifying liquid, feeding the dried aggregate into the modifying liquid, and uniformly stirring and mixing, so as to obtain a suspension liquid; (3) putting the suspension liquid into a sealed container, leading
carbon dioxide gas into the suspension liquid, filtering,and airing the aggregate, so as to obtain the modified recycled coarse aggregate. The anti-seepage recycled concrete has the
advantage of good anti-seepage property.