Anti-seepage recycled concrete and preparation method thereof

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of building materials, more specifically, it relates to an impermeable recycled concrete and a preparation method thereof. Background technique [0002] With the rapid development of the construction industry, the pace of urbanization is getting faster and faster, and at the same time, there are more and more old city renovation projects, which have resulted in a large amount of abandoned construction waste. Most of the construction waste in our country has not been recycled in a scientific way. The vast majority of construction waste is disposed of as garbage, randomly piled in the open air, or disposed of in a simple landfill. [0003] A Chinese invention patent with publication number CN107010896A discloses a recycled concrete mixed with chopped basalt fiber and recycled coarse aggregate, which is characterized in that: it is made of the following raw materials by weight: 100-300 parts of water, ordinary...

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Problems solved by technology

[0004] Compared with the natural aggregate, the recycled coarse aggregate in the above-mentioned patent is covered with hardened cement slurry on the surface of the recycled coarse aggregate, so the total content of new and old cement mortar in recycled concrete is higher than that of ordinary concrete, so its porosity is higher than that of natural concrete , poor impermeability

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