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Regenerated powder concrete with good durability, and preparation method thereof

A technology of recycled concrete and recycled powder, which is applied in the field of concrete preparation, can solve problems such as the decline in mechanical properties and durability of concrete structures, and corrosion of steel bars, so as to reduce the amount of cement, increase the amount, and optimize the ability to resist chloride ion erosion. Effect

Pending Publication Date: 2019-12-20
FUZHOU UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Reinforced concrete structure is the main structural form of many buildings. Chloride ions penetrate into the interior of the concrete and reach the surface of the steel bar through penetration, which will cause corrosion of the steel bar, which will lead to a decrease in the structural mechanical properties and durability of the concrete.

Method used

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  • Regenerated powder concrete with good durability, and preparation method thereof
  • Regenerated powder concrete with good durability, and preparation method thereof
  • Regenerated powder concrete with good durability, and preparation method thereof

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preparation example Construction

[0024] The preparation method of recycled concrete powder: when the discarded old concrete blocks are broken into recycled aggregates, the powder produced in the crushing process is collected, and the powder with a particle size below 0.6mm is screened out for use, and put into four Recycled concrete powder is prepared by grinding steel balls of different sizes and steel forgings in SM-500 ball mill, and its specific surface area is 863m 2 / kg, the particle size is less than 5μm accounted for 18.38%, 5-10μm accounted for 11.66%, 10-20μm accounted for 14.51%, 20-45μm accounted for 25.31%, 45-100μm accounted for 17.21%, 100-160μm accounted for 8.21%, 160-250μm Accounting for 4.72%, the 28d activity index of recycled concrete powder is 80%. The chemical composition is shown in Table 1.

[0025] The preparation method of regenerated brick powder: remove the old mortar attached to the surface of the waste clay brick and then crush it, collect the powder generated during the crushi...

example 1

[0040] A recycled powder concrete, which is prepared by cement, recycled brick powder, water, sand, natural aggregate, and water reducer at a mass ratio of 1:0.111:0.444:1.652:2.694:0.002. Recycled brick powder 10% and other quality to replace cement.

[0041] According to the "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" (GB50081-2002), the recycled powder concrete of the present invention has a 7d cube compressive strength of 42.92MPa, a 28d cube compressive strength of 52.96MPa, and a 56d cube compressive strength of 53.30MPa. The slump is 160mm.

[0042] For the recycled powder concrete of the present invention, the ASTMC1202 method and the NEL method are used to evaluate its resistance to chloride ion penetration. The electric flux of the concrete tested by ASTMC1202 method is 3714.67C, and the permeability evaluation is medium; the anti-chloride ion diffusion coefficient measured by NEL method is 4.94, and the permeability evaluation is low (...

example 2

[0044] A recycled powder concrete, which is prepared by cement, recycled concrete powder, water, sand, natural aggregate, and water reducer at a mass ratio of 1:0.111:0.444:1.652:2.694:0.001. Recycled concrete powder 10% and other quality to replace cement.

[0045] According to the "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" (GB50081-2002), the recycled powder concrete of the present invention has a 7d cube compressive strength of 42.96MPa, a 28d cube compressive strength of 52.44MPa, and a 56d cube compressive strength of 53.23MPa. The slump is 155mm.

[0046] For the recycled powder concrete of the present invention, the ASTMC1202 method and the NEL method are used to evaluate its resistance to chloride ion penetration. The electric flux of the concrete tested by ASTMC1202 method is 3777C, and the permeability evaluation is medium; the anti-chloride ion diffusion coefficient measured by NEL method is 4.84, and the permeability evaluation is lo...

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Abstract

The invention particularly relates to a preparation method of recycled concrete for improving chlorine ion resistance by utilizing regenerated powder. The method comprises: respectively grinding powders in waste concrete and waste clay brick breaking processes to prepare regenerated powder, partially replacing cement with the regenerated powder, and stirring to prepare the recycled concrete by adopting a neat paste stone-wrapping method. According to the invention, the prepared recycled concrete can fully utilize the construction waste and reduce the cement consumption, has good chlorine ion penetration resistance, and further has remarkable economic benefits, social benefits and environmental benefits.

Description

technical field [0001] The invention belongs to the field of concrete preparation, and in particular relates to a recycled powder concrete with good durability and a preparation method. Background technique [0002] Waste concrete and waste bricks account for up to 80% of construction solid waste, and the use of waste concrete and waste bricks can greatly reduce the negative impact of construction solid waste. However, during the recycling process of waste concrete and waste bricks, such as crushing and processing, a large amount of recycled concrete powder and recycled brick powder are produced, but there is no good utilization method for them, which is likely to cause secondary pollution. Chemical composition of recycled concrete powder and recycled brick powder based on SiO 2 and Al 2 o 3 Mainly, but the CaO content is low, it can be used as a mixture of cement. Therefore, using recycled concrete powder and recycled brick powder to partially replace cement in concrete...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/16C04B14/06C04B14/048C04B2103/302C04B18/141
Inventor 罗素蓉吴恺云王雪芳王德辉
Owner FUZHOU UNIVERSITY
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