Compression-resistant carbonization-resistant recycled concrete and preparation method thereof

Abstract

The invention relates to the field of recycled concrete, and particularly discloses compression-resistant carbonization-resistant recycled concrete and a preparation method thereof. The compression-resistant carbonization-resistant recycled concrete comprises the following raw materials in parts by weight: 310 to 340 parts of ordinary Portland cement, 46 to 57 parts of fly ash, 980 to 1020 parts of recycled coarse aggregate, 690 to 750 parts of fine aggregate, 4 to 7 parts of a water reducing agent, 130 to 165 parts of water, 40 to 60 parts of nanometer silicon dioxide, 5 to 8 parts of sodium carboxymethyl cellulose, and 24 to 30 parts of 4A zeolite. The preparation method comprises the step of uniformly mixing the above raw materials to obtain the recycled concrete. The compression-resistant carbonization-resistant recycled concrete and the preparation method thereof have the advantages that the carbonization resistance of the recycled concrete is improved, so the compression strength of the recycled concrete is improved.

Description

technical field [0001] The application relates to the field of recycled concrete, more specifically, it relates to a compression-resistant and carbonation-resistant recycled concrete and a preparation method thereof. Background technique [0002] Recycled concrete refers to using discarded concrete blocks as recycled coarse aggregates. After crushing, cleaning, and grading, they are mixed with grading in a certain proportion to partially or completely replace natural coarse aggregates such as sand and gravel, and then add cement, water, etc. The resulting new concrete realizes the reuse of waste resources. [0003] In related technologies, reinforced concrete structures are widely used in marine development projects because they have the advantages of both concrete and steel bars. During construction and use, chloride ions in the marine environment adhere to the surface of reinforced concrete structures along with sea breeze, salt spray, and precipitation, and enter the int...

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Problems solved by technology

[0004] However, reinforced concrete structures in the marine environment are exposed to the atmosphere most of the time, and carbon dioxide in the atmosphere can penetrate into the interior of the concrete through the pores on the surface of the hardened concrete. Carbon dioxide will destroy the high alkaline environment inside the concrete, and then destroy the oxidation of the steel surface membrane

[0005] Abandoned concrete blocks have a rich pore structure. After the recycled concrete is formed, the carbonation resistance of the recycled concrete decreases. Under the joint action of carbon dioxide and chloride ions, the corrosion of the steel bars in the recycled concrete is aggravated, and the destruction of the steel bars makes the recycled concrete The compressive strength of the

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