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Recycled concrete produced from construction wastes and production method thereof

A technology for recycling concrete and construction waste, applied in the field of building wall materials, can solve the problems of fluctuation in the performance of recycled concrete, incompatibility with the design of the proportion of recycled coarse aggregate from waste bricks, high water absorption, etc., so as to enhance work performance and increase resources. The effect of recycling utilization and resource saving

Active Publication Date: 2014-10-01
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of fluctuations in the performance of recycled concrete caused by the high water absorption of recycled aggregates, many scholars at home and abroad have proposed the strength formula of recycled concrete, trying to use the strength formula to design the mix ratio of recycled concrete, but these formulas are mostly for waste. The mix ratio design of concrete recycled fine aggregate has certain limitations and is not suitable for the mix ratio design of waste brick recycled coarse aggregate

Method used

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  • Recycled concrete produced from construction wastes and production method thereof
  • Recycled concrete produced from construction wastes and production method thereof
  • Recycled concrete produced from construction wastes and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A kind of recycled concrete produced with construction waste as raw material. The concrete with strength grade of C10-C20 is made by mixing recycled coarse aggregate, recycled fine aggregate, cementitious material and water. The recycled concrete described per cubic meter The content of each component is: recycled coarse aggregate 650~770kg / m 3 ;Regenerated fine aggregate 576~764kg / m 3 ;Cementitious material 267~400kg / m 3 ;Water 255~345kg / m 3 , the sand rate of the recycled concrete is 43%-51%, and the recycled concrete is used for the manufacture of wall panels or walls that do not require high strength.

[0047] Regenerated coarse aggregate is made from waste bricks after slight crushing and screening, the particle size is 5-80mm, and the apparent density of the regenerated coarse aggregate is 1550-1700kg / m 3 , The bulk density is 750~800kg / m 3 , The porosity is 45-55%, the water absorption is 15-17%, and the crushing index is 35-45%.

[0048] Regenerated fine ag...

Embodiment 2

[0085] It is the recycled concrete of C10 that preparation is used for the strength class of prefabricated wall board board core, repeats embodiment one, has following difference:

[0086] The content of each component per cubic meter is as shown in Table 7,

[0087] Table 7

[0088]

[0089] Mix and stir according to the content of each component per cubic meter described in Table 7. The mixing and stirring method adopts the mixing process of adding additional water to the recycled coarse aggregate in advance and stirring twice in stages. The prepared phase strength grade is C10 recycled concrete.

[0090] The elastic modulus of the recycled concrete with strength grade C10 is 0.970×10 4 MPa, the compressive strength of the 28d cube is 12.83MPa, which meets the strength performance requirements of the prefabricated wallboard core.

Embodiment 3

[0092] It is the recycled concrete of C15 that preparation is used for the strength class of prefabricated wall board board core, repeats embodiment one, has following difference:

[0093] The content of each component per cubic meter is as shown in Table 8,

[0094] Table 8

[0095]

[0096] Mix and stir according to the content of each component per cubic meter described in Table 8. The mixing and stirring method adopts the mixing process of adding additional water to the recycled coarse aggregate in advance and stirring twice in stages. The strength level of the prepared phase is C15 recycled concrete.

[0097] The elastic modulus of the recycled concrete with strength grade C15 is 1.219×10 4 MPa, the compressive strength of the 28d cube is 17.21MPa, which meets the strength performance requirements of the prefabricated wallboard core.

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Abstract

The invention relates to recycled concrete produced from construction wastes and a production method thereof. The recycled concrete is prepared by mixing and stirring recycled coarse aggregates, recycled fine aggregates, binding materials and water and is C10-C20 in strength grade, wherein each cubic meter of the recycled concrete contains the following components: 650-770kg / m<3> of recycled coarse aggregates, 576-764kg / m<3> of recycled fine aggregates, 267-400kg / m<3> of binding materials and 255-345kg / m<3> of water; the recycled concrete is used for preparing wallboard components or walls having not high requirement on strength. The recycled concrete is produced from waste bricks which serve as recycled coarse aggregates and waste concrete functioning as recycled fine aggregates through reasonable proportions, so that the recycled concrete meets a requirement of constructing walls and wallboards, thus solving problems in recycling waste bricks and waste concrete in the construction wastes and solving preparation technical problems.

Description

Technical field: [0001] The invention belongs to the technical field of building wall materials, and in particular relates to recycled concrete produced by using construction waste as a raw material for wall construction and a production method thereof. Background technique: [0002] After investigation and research, a large number of old buildings in urban and rural areas in my country adopt masonry structures or mixed structures with traditional sintered clay bricks as the main material, resulting in the main components of construction waste generated during urban construction and old city renovation. Clay bricks, waste concrete components and test blocks. At present, the traditional treatment methods for construction waste are mainly landfill and open-air stacking, and the rate of resource reuse is very low. At the same time, on the one hand, this treatment method invades and destroys the land, aggravating the tension and waste of land resources; on the other hand, it pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/16
CPCY02W30/91
Inventor 张龑刘立新毕苏萍赵文兰郝彤陈萌鲁春晓陈晶晶管品武杜朝华
Owner ZHENGZHOU UNIV
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