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A technology of waste concrete and concrete admixture, which is applied in the field of concrete, can solve the problems of high energy consumption and high recycling cost, and achieve the effects of low recycling cost, saving garbage disposal costs, and reducing environmental pollution
Inactive Publication Date: 2010-06-16
HUAIAN JIEDA CONCRETE
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The above two recycling methods, although the stones and cement mortar in the waste concrete are recycled, but the energy consumption is large and the recycling cost is high
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Embodiment 1
[0020] A method for recycling waste concrete, comprising the steps of:
[0021] (1) Sorting out the metal, wood, plastic, etc. in the waste concrete, and then crushing it into a hammer crusher until the particle size is less than or equal to 20mm, and then removing the impurities in it: metal, wood, plastic, etc. Pick it up, then put it into a ball mill, add concrete activator by 4% of its weight, and grind to a specific surface area greater than or equal to 390 square meters per kilogram; waste concrete contains 20% waste mortar in this embodiment .
[0022] (2) The particle size specific surface area that step (1) obtains is greater than or equal to the regenerated admixture of 390 square meters per kilogram, and cement, medium coarse sand, 5-25mm crushed stone, water, concrete admixture in the following parts by weight Proportioning and mixing to prepare recycled concrete;
[0023] 90 parts of recycled admixture, 250 parts of cement, 730 parts of medium-coarse sand, 1000 ...
Embodiment 2
[0025] 100 parts of recycled admixture, 270 parts of cement, 765 parts of medium-coarse sand, 1080 parts of crushed stone, 185 parts of water, and 5.2 parts of concrete admixture.
[0026] All the other implementations are as in Example 1.
Embodiment 3
[0028] 110 parts of recycled admixture, 290 parts of cement, 790 parts of medium-coarse sand, 1150 parts of crushed stone, 195 parts of water, and 5.8 parts of concrete admixture.
[0029] All the other implementations are as in Example 1.
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Abstract
The invention discloses a method for recycling waste concrete, which comprises the following steps: (1) crushing the waste concrete (which can contain mortar) in a crusher into a grain diameter of less than or equal to 20 mm, removing impurities, such as metal, wood and plastic, putting the waste concrete into a ball mill, simultaneously adding a concrete excitant accounting for 3 to 5 percent of the weight of the waste concrete, and milling the waste concrete into a specific surface area of more than or equal to 390 square meters per kilogram; and (2) mixing the recycled admixture with the specific surface area of more than or equal to 390 square meters per kilogram obtained from the step (1) and cement, medium-coarse sand, macadam with 5 to 25 mm, water and a concrete admixture in part by weight: 80 to 120 parts of the recycled admixture, 230 to 300 parts of the cement, 710 to 800 parts of the medium-coarse sand, 900 to 1,200 parts of the macadam, 160 to 200 parts of the water, and 4 to 6 parts of the concrete admixture to prepare the recycled concrete.
Description
Technical field: [0001] The invention relates to concrete, in particular to a recycling method for waste concrete. Background technique: [0002] During the construction of cities in our country, a large amount of construction waste is produced every year. Construction waste, also known as solid waste, generally includes concrete, mortar, bricks, tiles, metal, wood and others. Concrete accounts for a relatively large proportion, especially for buildings with reinforced concrete structures, and concrete accounts for more than 60% of its solid waste. [0003] At present, most of the disposal methods for waste concrete are transporting it to designated places for backfilling, which not only takes up a lot of land, but also pollutes the environment, which is not conducive to sustainable development. In recent years, the industry has been actively exploring and researching the recycling and utilization of waste concrete, and proposed to recycle the stones in waste concrete and ...
Claims
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