Recycled concrete

A technology of recycled concrete and recycled coarse aggregate, which is applied in the field of concrete, can solve the problems of increased water absorption rate of recycled aggregates, influence of recycled concrete compressive strength, and impact on the service life of recycled concrete, so as to achieve low water absorption, reduce Pan-alkaline phenomenon, strong rigidity effect

Inactive Publication Date: 2019-09-27
广州市建筑集团混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the fact that waste concrete needs to be subjected to a large external force during the crushing process, a large number of fine cracks are prone to appear inside the aggregate, which easily increases the porosity of the recycled aggregate, which in turn m...

Method used

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  • Recycled concrete
  • Recycled concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A recycled concrete comprising the following components in parts by mass:

[0056] 5kg of water; 15kg of Portland cement; 4kg of water reducing agent; 73kg of recycled coarse aggregate; 38kg of fine aggregate; 4kg of hollow glass microspheres; 5kg of acrylic acid emulsion;

[0057] In this embodiment, the particle size of the hollow glass microspheres is 30 μm.

[0058] In this embodiment, the particle size of microsilica is 1200 mesh.

[0059] The preparation method of recycled concrete is as follows:

[0060] S1. In the cement mixer, under normal temperature conditions, add 15kg of Portland cement and stir at a speed of 160r / min;

[0061] S2. Add 5kg of water and 4kg of water reducing agent while stirring, and form a premix after stirring evenly;

[0062] S3. Add 73kg of regenerated coarse aggregate, 38kg of fine aggregate, 4kg of hollow glass microspheres, and 2kg of microsilica fume to a sandstone mixer at room temperature, and stir at a speed of 120r / min. After ...

Embodiment 2

[0065] A recycled concrete comprising the following components in parts by mass:

[0066] 5.5kg of water; 13kg of Portland cement; 3kg of water reducing agent; 80kg of recycled coarse aggregate; 35kg of fine aggregate; 2kg of hollow glass microspheres; 7kg of acrylic emulsion;

[0067] In this embodiment, the particle size of the hollow glass microspheres is 33 μm.

[0068] In this embodiment, the particle size of microsilica is 1250 mesh.

[0069] The preparation method of recycled concrete is as follows:

[0070] S1. In the cement mixer, under normal temperature conditions, add 13kg of Portland cement and stir at a speed of 160r / min;

[0071] S2. Add 5.5kg of water and 3kg of water reducing agent while stirring, and form a premix after stirring evenly;

[0072] S3. Add 80kg of regenerated coarse aggregate, 35kg of fine aggregate, 2kg of hollow glass microspheres, and 1kg of microsilica fume to a sandstone mixer at room temperature, and stir at a speed of 120r / min. After s...

Embodiment 3

[0075] A recycled concrete comprising the following components in parts by mass:

[0076] 6kg of water; 14kg of Portland cement; 5kg of water reducer; 65kg of recycled coarse aggregate; 40kg of fine aggregate; 5kg of hollow glass beads; 8kg of acrylic emulsion;

[0077] In this embodiment, the particle size of the hollow glass microspheres is 35 μm.

[0078] In this embodiment, the particle size of microsilica is 1300 mesh.

[0079] The preparation method of recycled concrete is as follows:

[0080] S1. In the cement mixer, under normal temperature conditions, add 14kg of Portland cement and stir at a speed of 160r / min;

[0081] S2. Add 6kg of water and 5kg of water reducing agent while stirring, and form a premix after stirring evenly;

[0082] S3. Add 65kg of regenerated coarse aggregate, 40kg of fine aggregate, 5kg of hollow glass microspheres, and 3kg of microsilica fume to a sandstone mixer at room temperature, and stir at a speed of 120r / min. After stirring evenly, bo...

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Abstract

The invention relates to the field of concrete, and provides recycled concrete aiming at the problem of large porosity of recycled aggregate. The recycled concrete is prepared from the following components in parts by mass: 5-6 parts of water, 13-15 parts of portland cement, 3-5 parts of awater reducing agent, 65-80 parts of recycled coarse aggregate, 35-40 parts of fine aggregate, 3-5 parts of hollow glass microbeads, 5-8 parts of an acrylic emulsion, and 1-3 parts of micro-silicon powder. By the synergistic cooperation of the hollow glass microbeads, the micro-silicon powder and the acrylic emulsion, the pores in the recycled aggregate filled with the hollow glass microbeads and the micro-silicon powder is facilitated, so that the impermeability of the recycled concrete is enhanced, and the enhancement of the compressive strength of the recycled concrete is facilitated while the reduction of the water absorption rate of the recycled concrete is facilitated.

Description

technical field [0001] The invention relates to the field of concrete, more specifically, it relates to a recycled concrete. Background technique [0002] Recycled concrete refers to the waste concrete blocks that are crushed, cleaned, and graded, mixed with gradation in a certain proportion, partially or completely replaced by natural aggregates such as sand and gravel (mainly coarse aggregates), 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] However, due to the fact that waste concrete needs to be subjected to a large external force during the crushing process, a large numbe...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B24/18C04B18/167C04B14/068C04B14/24C04B24/2641C04B18/146
Inventor 洪海禄
Owner 广州市建筑集团混凝土有限公司
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