A kind of ready-mixed recycled concrete and preparation method thereof

Abstract

The invention discloses premixed recycled concrete which is characterized in that the premixed concrete per cube is prepared from the following raw materials by weight: 133-162 kg of 42.5# cement, 300-327 kg of first yellow sand, 571-608 kg of second yellow sand, 387-404 kg of natural pebbles, 527-547 kg of recycled coarse aggregate, 71-80 kg of coal ash, 2.66-3.20 kg of additive, 129-160 kg of mineral powder and 122-126 kg of water; the slump of the premixed concrete is 120+ / -30 mm. A preparation method of the premixed concrete comprises the following steps: firstly, adding the first yellow sand, the second yellow sand, the mineral powder, the 42.5# cement and the coal ash according to a feeding sequence and stirring for 20 seconds; then adding the natural pebbles and the recycled coarse aggregate and stirring for 20 seconds; finally adding water and the additive and stirring for 60 seconds; discharging out of a stirrer. According to the premixed recycled concrete, the mixing amount of the recycled coarse aggregate in the premixed concrete having the strength grade of C30 can reach 100% and the mixing amount of the recycled coarse aggregate in the premixed concrete having the strength grade of C40 can reach 50%.

Description

technical field [0001] The invention relates to the technical field of construction waste recycling, in particular to a ready-mixed recycled concrete and a preparation method thereof. Background technique [0002] With the development of my country's modernization and the acceleration of urbanization, large-scale new city construction and old city renovation have led to an increasing amount of construction waste. Construction waste refers to the waste generated during the construction, repair and demolition of buildings, usually including waste bricks and tiles, waste stones, concrete blocks, sand and lime soil. At present, most of the waste concrete is piled or landfilled directly without treatment, which not only takes up a lot of land, pollutes the environment, but also causes a lot of waste of resources. Since our country has been carrying out large-scale construction in recent years, a large amount of sand, stone and cement building materials have been consumed, and na...

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Problems solved by technology

[0012] However, the above literature reports that the amount of recycled coarse aggregate added is relatively low

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