High-strength recycled concrete and preparation method thereof

Abstract

The invention discloses a high-strength recycled concrete and a preparation method thereof, and relates to the field of building materials. The high-strength recycled concrete is prepared from the following components 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 flyash, 6 to 10 parts of micro-silicon powder, 1 to 2 parts of polycarboxylate water reduction agent, 8 to 12 parts of sodium gluconate, 5 to 6 parts of nanometer carbon fiber, 8 to 10 parts of stainlesssteel fiber, and 35 to 45 parts of water. The high-strength recycled concrete has the advantages that the compressive strength is high, and the anti-seepage property is good.

Description

technical field [0001] The invention relates to the technical field of building materials, more specifically, it relates to a high-strength recycled concrete and a preparation method thereof. Background technique [0002] Recycled concrete means that waste concrete blocks are crushed, cleaned and graded, mixed with gradation in a certain proportion, partially or completely replaced by natural aggregates (mainly coarse aggregates) such as sand and gravel, and then added with cement, water, etc. new concrete. Recycled concrete can have the following situations according to the combination of aggregates: all aggregates are recycled aggregates; coarse aggregates are recycled aggregates, fine aggregates are natural sand; coarse aggregates are natural gravel or pebbles, fine aggregates The raw materials are recycled aggregates; recycled aggregates replace part of the coarse or fine aggregates. [0003] A Chinese invention patent with publication number CN107010896A discloses a r...

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Problems solved by technology

[0004] Compared with the natural aggregate, the recycled coarse aggregate in the above-mentioned patents: the surface of the recycled coarse aggregate is covered with hardened cement slurry, so the bonding between the recycled coarse aggregate and the old and new mortar is relatively weak, and the recycled coarse aggregate absorbs water. The rate is high, the water consumption has increased, the strength of the recycled coarse aggregate is revealed, the crushing value is relatively large, and the initial damage is secondary damage, so there are a lot of micro-cracks inside the recycled coarse aggregate, so its compressive strength is higher than that of ordinary concrete low

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