CN107640943B - Self-decoration recycled aggregate pervious concrete product and preparation method thereof - Google Patents
Self-decoration recycled aggregate pervious concrete product and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a self-decoration recycled aggregate pervious concrete product and a preparation method thereof, and is characterized in that: the product is formed by compounding a recycled aggregate permeable concrete base layer and a recycled aggregate self-decoration surface layer; the base layer is formed by mixing ordinary portland cement, concrete or/and mortar type construction waste recycled aggregate with the particle size of 2.36-9.5 mm, concrete or/and mortar type construction waste recycled aggregate with the particle size of less than or equal to 2.36mm and water; the surface layer is formed by mixing white cement, building garbage recycled decorative aggregate of one or more than two of sintered bricks and tiles with the grain size of less than or equal to 2.36mm, glass and ceramics and water. The preparation method comprises the following steps: mixing the base layer raw material and the surface layer raw material respectively, and then paving by layers, pressing and forming to prepare a blank, demoulding and naturally curing to obtain the finished product. The product of the invention has good mechanical property, water permeability and decorative effect, and strong practicability.
Description
Technical Field
The invention belongs to the utilization of wastes and the preparation of building material products, and relates to a self-decoration recycled aggregate pervious concrete product and a preparation method thereof. The self-decoration recycled aggregate pervious concrete product is suitable for being used as a material for (sponge) urban road construction.
Background
At present, China is in the key stage of economic and social development and the peak of urbanization process, and two problems are caused by the continuous acceleration of the state on infrastructure investment and the urbanization process: firstly, the new construction maintains the consumption of the sandstone aggregate at a very high level, and according to statistics, the annual production and the sales volume of the sandstone in China are more than 100 hundred million tons; secondly, a large amount of construction waste is generated by reconstruction and demolition of old buildings, and according to conservative estimation, the generation of the construction waste in China every year is more than 15 hundred million tons in the coming decade. In the prior art, sandstone aggregate mainly depends on mined natural resources; the construction waste is mainly buried and dumped. The regeneration and recycling of the construction waste into the building are the most effective ways for relieving the dependence of the sandstone aggregate on natural resources and solving the pollution of the construction waste. However, the sources of construction waste are complex and mainly include sintered bricks and tiles, glass, ceramics, concrete, mortar, and the like. After being crushed and processed, the concrete and mortar building garbage can replace part of traditional gravels without generating great influence on the performance of the concrete; the construction waste of the baked bricks and tiles is a sintered product, has large amount, multiple holes, large water absorption and large crushing value, and is not suitable for being used as structural concrete aggregate with large mixing amount; the glass, the ceramic and the like are compact and smooth, and the bonding property with the concrete cementing material matrix is poor. The high-valued and large-scale application of the construction waste recycled aggregate in commercial concrete is limited.
In recent years, in order to solve the modern urban diseases such as waterlogging, underground water level reduction, heat island and the like, the nation proposes a sponge city construction strategy. The pervious concrete and the products thereof have better mechanical property, water permeability and decoration, and become the main materials for sponge urban road construction. In the prior art, the pervious concrete product is mainly composed of a pervious base layer and a decorative surface layer in a composite manner, wherein the pervious base layer is prepared by adopting ordinary portland cement and conventional sandstone aggregate, and the decorative surface layer generally needs to take white cement as a cementing material, conventional building sand as aggregate and various industrial pigments for color to achieve the decorative effect. There is also a technology of replacing the conventional building sand with natural color sand as aggregate. The industrial pigment is used as the surface decoration admixture, the pigment is easy to fade, and the industrial pigment is expensive; natural colored sand is a natural protected resource, and collection can damage the environment.
Disclosure of Invention
The invention aims to overcome the defects that the utilization rate of construction waste resources is low, building sandstone aggregate is in short supply, industrial pigment in a pervious concrete product is easy to fade and natural colored sand is difficult to collect in the prior art, and provides a self-decoration recycled aggregate pervious concrete product and a preparation method thereof. The self-decoration recycled aggregate permeable concrete product has better mechanical property, permeability and decoration effect; in addition, the surface layer adopts the recycled aggregate of the sintered bricks and tiles, the glass and the ceramic building waste as the decorative aggregate, no industrial pigment is required to be added, the surface layer is natural, beautiful and elegant in decoration, does not fade, and is high in practicability.
The content of the invention is as follows: a self-decoration recycled aggregate pervious concrete product is characterized in that: the self-decoration recycled aggregate pervious concrete product is formed by compounding a recycled aggregate pervious concrete base layer with the thickness of 50-65 mm and a recycled aggregate self-decoration surface layer with the thickness of 10-15 mm;
the recycled aggregate permeable concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 56-72 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of 2.36-9.5 mm, 8-24 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of less than or equal to 2.36mm and 8 parts by weight of water;
the recycled aggregate self-decoration surface layer is formed by mixing 20 parts by weight of white cement, 80-120 parts by weight of building waste recycled decoration aggregate of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water.
The invention comprises the following steps: the preparation method of the construction waste recycled aggregate comprises the following steps: recovering the construction waste, and sorting out concrete, mortar construction waste and sintered brick, tile, glass and ceramic construction waste; crushing concrete and mortar building waste, and respectively screening particles with the particle size of 2.36-9.5 mm and the particle size of less than or equal to 2.36mm as building waste recycled aggregate for the recycled aggregate permeable concrete base layer; and (3) crushing the building garbage of sintered bricks, tiles, glass and ceramics, screening out particles with the particle size less than or equal to 2.36mm, and using the particles as the building garbage recycled decorative aggregate for the self-decorative surface layer of the recycled aggregate.
The invention comprises the following steps: the strength grade of the ordinary portland cement is not lower than 42.5 MPa. For example: southwest cement p.o425 ordinary portland cement; sichuan Emei Sheng P.O425R ordinary portland cement; p.o525r portland cement by ralkyo corporation.
The invention comprises the following steps: the white cement is P.W.52.5-grade white cement (Alibo brand) or P.W.42.5-grade white cement (Alibo brand) produced by Aliboportland (Anqing) Co.
In another aspect of the invention: a preparation method of a self-decoration recycled aggregate pervious concrete product is characterized by comprising the following steps:
a. preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 56-72 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of 2.36-9.5 mm, 8-24 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of less than or equal to 2.36mm and 8 parts by weight of water as the raw material of the recycled aggregate permeable concrete base layer;
taking raw materials of each component according to the proportion of 20 parts by weight of white cement, 80-120 parts by weight of building waste recycled decorative aggregate of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water as raw materials of a recycled aggregate self-decoration surface layer;
b. stirring and mixing: b, respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the preparation raw materials weighed in the step a to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
c. material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is 10-15 mm; paving the recycled aggregate permeable concrete base layer mixture on the recycled aggregate self-decoration surface layer mixture for compounding, wherein the paving thickness is 50-65 mm, and obtaining a double-layer compound mixture;
d. molding: pressing and molding the double-layer composite mixture obtained in the step c under the pressure of 2-5 MPa, and demolding to obtain a molded blank;
e. and (5) maintenance: and (3) placing the formed blank in an environment with the temperature of 15-25 ℃ and the humidity of 50-90% for curing for 28 days to obtain the self-decoration recycled aggregate pervious concrete product.
In another aspect of the invention: the preparation method of the construction waste recycled aggregate comprises the following steps: recovering the construction waste, and sorting out concrete, mortar construction waste and sintered brick, tile, glass and ceramic construction waste; crushing concrete and mortar building waste, and respectively screening particles with the particle size of 2.36-9.5 mm and the particle size of less than or equal to 2.36mm as building waste recycled aggregate for the recycled aggregate permeable concrete base layer; and (3) crushing the building garbage of sintered bricks, tiles, glass and ceramics, screening out particles with the particle size less than or equal to 2.36mm, and using the particles as the building garbage recycled decorative aggregate for the self-decorative surface layer of the recycled aggregate.
In another aspect of the invention: the strength grade of the ordinary portland cement is not lower than 42.5 MPa. For example: southwest cement p.o425 ordinary portland cement; sichuan Emei Sheng P.O425R ordinary portland cement; p.o525r portland cement by ralkyo corporation.
In another aspect of the invention: the white cement is P.W.52.5-grade white cement (Alibo brand) or P.W.42.5-grade white cement (Alibo brand) produced by Aliboportland (Anqing) Co.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
(1) the preparation of the base layer and the surface layer of the self-decoration recycled aggregate pervious concrete product completely uses the recycled aggregate of the construction waste as the aggregate, provides a suitable way for the comprehensive utilization of the construction waste with huge discharge amount, saves the natural sandstone aggregate and avoids the environmental damage caused by the production of the natural sandstone aggregate;
(2) by adopting the invention, the building garbage recycled aggregate has the inherent characteristics of water absorption, porosity and the like, so that the building garbage recycled aggregate becomes an excellent alternative aggregate for preparing pervious concrete and products thereof; in addition, the building wastes such as sintered bricks, tiles, glass, ceramics and the like have colors, have obvious self-decoration effect and can replace industrial pigments and natural colored sand to be used for decorating the surface layer of the pervious concrete product; the recycled aggregate self-decoration facing layer takes the sintered brick and tile, glass, ceramic building wastes as recycled decoration aggregates, does not need to add industrial pigment or natural colored sand, directly realizes the self-decoration effect, simultaneously does not fade the recycled decoration aggregates such as the sintered brick and tile, the glass, the ceramic and the like in the use process, and has natural, beautiful, elegant and fadeless surface layer decoration;
(3) the self-decoration recycled aggregate permeable concrete product has better mechanical property, water permeability and decoration effect, is particularly suitable for the construction of sponge urban permeable roads, and has very important social, economic and environmental benefits from the aspects of building garbage treatment and reclamation, natural resource saving and the development of the decoration effect of the permeable concrete product;
(4) the product of the invention has simple preparation process, simple and convenient working procedure, easy operation and strong practicability.
Detailed Description
The following examples are intended to further illustrate the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims appended hereto.
Example 1:
a self-decorating recycled aggregate pervious concrete product comprises a recycled aggregate pervious concrete base layer and a recycled aggregate self-decorating finish layer. Wherein the recycled aggregate pervious concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 2.36-9.5 mm concrete, 56 parts by weight of mortar type construction waste recycled aggregate, less than or equal to 2.36mm concrete, 24 parts by weight of mortar type construction waste recycled aggregate and 8 parts by weight of water; wherein the recycled aggregate self-decoration surface layer is formed by mixing component raw materials of 20 parts by weight of white cement, 100 parts by weight of sintered bricks and tiles with the thickness less than or equal to 2.36mm, glass, ceramic building garbage recycled decoration aggregate and 10 parts by weight of water.
The preparation method of the self-decoration recycled aggregate pervious concrete product comprises the following steps:
1) preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 2.36 mm-9.5 mm concrete, 56 parts by weight of mortar type construction waste recycled aggregate, less than or equal to 2.36mm concrete, 24 parts by weight of mortar type construction waste recycled aggregate and 8 parts by weight of water as the raw materials of a recycled aggregate permeable concrete base layer; taking raw materials of each component according to the mixture ratio of 20 parts by weight of white cement, 100 parts by weight of recycled decorative aggregate of sintered bricks and tiles with the diameter less than or equal to 2.36mm and 10 parts by weight of water as raw materials of a self-decorative surface layer of the recycled aggregate;
2) stirring: respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the weighed preparation raw materials in the step 1) to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
3) material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is not less than 10mm, and paving the recycled aggregate permeable concrete base layer mixture on the surface layer mixture;
4) molding: pressing and forming at the pressure of 2-5 MPa, and demolding;
5) and (5) maintenance: and curing the formed blank for 28 days in an environment with the temperature of 20 ℃ and the humidity of not less than 50 percent to obtain the self-decoration recycled aggregate pervious concrete product.
Example 2:
a self-decorating recycled aggregate pervious concrete product comprises a recycled aggregate pervious concrete base layer and a recycled aggregate self-decorating finish layer. Wherein the recycled aggregate pervious concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 2.36-9.5 mm concrete, 64 parts by weight of mortar type construction waste recycled aggregate, less than or equal to 2.36mm concrete, 16 parts by weight of mortar type construction waste recycled aggregate and 8 parts by weight of water; wherein the recycled aggregate self-decoration surface layer is formed by mixing component raw materials of 20 parts by weight of white cement, 100 parts by weight of sintered bricks and tiles with the thickness less than or equal to 2.36mm, glass, ceramic building garbage recycled decoration aggregate and 10 parts by weight of water.
The preparation method of the self-decoration recycled aggregate pervious concrete product comprises the following steps:
1) preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 2.36 mm-9.5 mm concrete, 64 parts by weight of mortar type construction waste recycled aggregate, 16 parts by weight of concrete with the thickness less than or equal to 2.36mm, mortar type construction waste recycled aggregate and 8 parts by weight of water as the raw materials of a recycled aggregate permeable concrete base layer; taking raw materials of each component according to the mixture ratio of 20 parts by weight of white cement, 100 parts by weight of recycled decorative aggregate of sintered bricks and tiles with the diameter less than or equal to 2.36mm and 10 parts by weight of water as raw materials of a self-decorative surface layer of the recycled aggregate;
2) stirring: respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the weighed preparation raw materials in the step 1) to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
3) material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is not less than 10mm, and paving the recycled aggregate permeable concrete base layer mixture on the surface layer mixture;
4) molding: pressing and forming at the pressure of 2-5 MPa, and demolding;
5) and (5) maintenance: and curing the formed blank for 28 days in an environment with the temperature of 20 ℃ and the humidity of not less than 50 percent to obtain the self-decoration recycled aggregate pervious concrete product.
Example 3:
a self-decorating recycled aggregate pervious concrete product comprises a recycled aggregate pervious concrete base layer and a recycled aggregate self-decorating finish layer. Wherein the recycled aggregate pervious concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 2.36-9.5 mm concrete, 72 parts by weight of mortar type construction waste recycled aggregate, less than or equal to 2.36mm concrete, 8 parts by weight of mortar type construction waste recycled aggregate and 8 parts by weight of water; wherein the recycled aggregate self-decoration surface layer is formed by mixing component raw materials of 20 parts by weight of white cement, 100 parts by weight of sintered bricks and tiles with the thickness less than or equal to 2.36mm, glass, ceramic building garbage recycled decoration aggregate and 10 parts by weight of water.
The preparation method of the self-decoration recycled aggregate pervious concrete product comprises the following steps:
1) preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 2.36 mm-9.5 mm concrete, 72 parts by weight of mortar type construction waste recycled aggregate, less than or equal to 2.36mm concrete, 8 parts by weight of mortar type construction waste recycled aggregate and 8 parts by weight of water as the raw materials of a recycled aggregate permeable concrete base layer; taking raw materials of each component according to the mixture ratio of 20 parts by weight of white cement, 100 parts by weight of recycled decorative aggregate of sintered bricks and tiles with the diameter less than or equal to 2.36mm and 10 parts by weight of water as raw materials of a self-decorative surface layer of the recycled aggregate;
2) stirring: respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the weighed preparation raw materials in the step 1) to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
3) material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is not less than 10mm, and paving the recycled aggregate permeable concrete base layer mixture on the surface layer mixture;
4) molding: pressing and forming at the pressure of 2-5 MPa, and demolding;
5) and (5) maintenance: and curing the formed blank for 28 days in an environment with the temperature of 20 ℃ and the humidity of not less than 50 percent to obtain the self-decoration recycled aggregate pervious concrete product.
Example 4:
a self-decorating recycled aggregate pervious concrete product comprises a recycled aggregate pervious concrete base layer and a recycled aggregate self-decorating finish layer. Wherein the recycled aggregate pervious concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 2.36-9.5 mm concrete, 64 parts by weight of mortar type construction waste recycled aggregate, less than or equal to 2.36mm concrete, 16 parts by weight of mortar type construction waste recycled aggregate and 8 parts by weight of water; wherein the recycled aggregate self-decoration surface layer is formed by mixing 20 weight parts of white cement, 80 weight parts of sintered bricks and tiles with the diameter less than or equal to 2.36mm, 80 weight parts of recycled decoration aggregate of glass and ceramic building wastes and 10 weight parts of water.
The preparation method of the self-decoration recycled aggregate pervious concrete product comprises the following steps:
1) preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 2.36 mm-9.5 mm concrete, 64 parts by weight of mortar type construction waste recycled aggregate, 16 parts by weight of concrete with the thickness less than or equal to 2.36mm, mortar type construction waste recycled aggregate and 8 parts by weight of water as the raw materials of a recycled aggregate permeable concrete base layer; taking raw materials of each component according to the mixture ratio of 20 parts by weight of white cement, 80 parts by weight of recycled decorative aggregate of sintered bricks and tiles with the diameter less than or equal to 2.36mm and 10 parts by weight of water as raw materials of a self-decoration surface layer of the recycled aggregate;
2) stirring: respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the weighed preparation raw materials in the step 1) to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
3) material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is not less than 10mm, and paving the recycled aggregate permeable concrete base layer mixture on the surface layer mixture;
4) molding: pressing and forming at the pressure of 2-5 MPa, and demolding;
5) and (5) maintenance: and curing the formed blank for 28 days in an environment with the temperature of 20 ℃ and the humidity of not less than 50 percent to obtain the self-decoration recycled aggregate pervious concrete product.
Example 5:
a self-decorating recycled aggregate pervious concrete product comprises a recycled aggregate pervious concrete base layer and a recycled aggregate self-decorating finish layer. Wherein the recycled aggregate pervious concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 2.36-9.5 mm concrete, 64 parts by weight of mortar type construction waste recycled aggregate, less than or equal to 2.36mm concrete, 16 parts by weight of mortar type construction waste recycled aggregate and 8 parts by weight of water; wherein the recycled aggregate self-decoration surface layer is formed by mixing 20 weight parts of white cement, 120 weight parts of sintered bricks and tiles with the thickness less than or equal to 2.36mm, 120 weight parts of recycled decoration aggregate of glass and ceramic building wastes and 10 weight parts of water.
The preparation method of the self-decoration recycled aggregate pervious concrete product comprises the following steps:
1) preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 2.36 mm-9.5 mm concrete, 64 parts by weight of mortar type construction waste recycled aggregate, 16 parts by weight of concrete with the thickness less than or equal to 2.36mm, mortar type construction waste recycled aggregate and 8 parts by weight of water as the raw materials of a recycled aggregate permeable concrete base layer; taking raw materials of each component according to the mixture ratio of 20 parts by weight of white cement, 120 parts by weight of recycled decorative aggregate of sintered bricks and tiles with the diameter less than or equal to 2.36mm and 10 parts by weight of water as raw materials of a self-decoration surface layer of the recycled aggregate;
2) stirring: respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the weighed preparation raw materials in the step 1) to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
3) material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is not less than 10mm, and paving the recycled aggregate permeable concrete base layer mixture on the surface layer mixture;
4) molding: pressing and forming at the pressure of 2-5 MPa, and demolding;
5) and (5) maintenance: and curing the formed blank for 28 days in an environment with the temperature of 20 ℃ and the humidity of not less than 50 percent to obtain the self-decoration recycled aggregate pervious concrete product.
Example 6:
a self-decorating recycled aggregate pervious concrete product comprises a recycled aggregate pervious concrete base layer and a recycled aggregate self-decorating finish layer. Wherein the recycled aggregate pervious concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 2.36-9.5 mm concrete, 72 parts by weight of mortar type construction waste recycled aggregate, less than or equal to 2.36mm concrete, 8 parts by weight of mortar type construction waste recycled aggregate and 8 parts by weight of water; wherein the recycled aggregate self-decoration surface layer is formed by mixing 20 weight parts of white cement, 120 weight parts of sintered bricks and tiles with the thickness less than or equal to 2.36mm, 120 weight parts of recycled decoration aggregate of glass and ceramic building wastes and 10 weight parts of water.
The preparation method of the self-decoration recycled aggregate pervious concrete product comprises the following steps:
1) preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 2.36 mm-9.5 mm concrete, 72 parts by weight of mortar type construction waste recycled aggregate, less than or equal to 2.36mm concrete, 8 parts by weight of mortar type construction waste recycled aggregate and 8 parts by weight of water as the raw materials of a recycled aggregate permeable concrete base layer; taking raw materials of each component according to the mixture ratio of 20 parts by weight of white cement, 120 parts by weight of recycled decorative aggregate of sintered bricks and tiles with the diameter less than or equal to 2.36mm and 10 parts by weight of water as raw materials of a self-decoration surface layer of the recycled aggregate;
2) stirring: respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the weighed preparation raw materials in the step 1) to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
3) material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is not less than 10mm, and paving the recycled aggregate permeable concrete base layer mixture on the surface layer mixture;
4) molding: pressing and forming at the pressure of 2-5 MPa, and demolding;
5) and (5) maintenance: and curing the formed blank for 28 days in an environment with the temperature of 20 ℃ and the humidity of not less than 50 percent to obtain the self-decoration recycled aggregate pervious concrete product.
Example 7:
a self-decorating recycled aggregate pervious concrete product comprises a recycled aggregate pervious concrete base layer and a recycled aggregate self-decorating finish layer. Wherein the recycled aggregate pervious concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 2.36-9.5 mm concrete, 56 parts by weight of mortar type construction waste recycled aggregate, less than or equal to 2.36mm concrete, 24 parts by weight of mortar type construction waste recycled aggregate and 8 parts by weight of water; wherein the recycled aggregate self-decoration surface layer is formed by mixing 20 weight parts of white cement, 80 weight parts of sintered bricks and tiles with the diameter less than or equal to 2.36mm, 80 weight parts of recycled decoration aggregate of glass and ceramic building wastes and 10 weight parts of water.
The preparation method of the self-decoration recycled aggregate pervious concrete product comprises the following steps:
1) preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 2.36 mm-9.5 mm concrete, 56 parts by weight of mortar type construction waste recycled aggregate, less than or equal to 2.36mm concrete, 24 parts by weight of mortar type construction waste recycled aggregate and 8 parts by weight of water as the raw materials of a recycled aggregate permeable concrete base layer; taking raw materials of each component according to the mixture ratio of 20 parts by weight of white cement, 80 parts by weight of recycled decorative aggregate of sintered bricks and tiles with the diameter less than or equal to 2.36mm and 10 parts by weight of water as raw materials of a self-decoration surface layer of the recycled aggregate;
2) stirring: respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the weighed preparation raw materials in the step 1) to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
3) material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is not less than 10mm, and paving the recycled aggregate permeable concrete base layer mixture on the surface layer mixture;
4) molding: pressing and forming at the pressure of 2-5 MPa, and demolding;
5) and (5) maintenance: and curing the formed blank for 28 days in an environment with the temperature of 20 ℃ and the humidity of not less than 50 percent to obtain the self-decoration recycled aggregate pervious concrete product.
The properties of the self-decorating recycled aggregate pervious concrete products obtained in examples 1 to 7 are shown in Table 1.
Table 1: the performance of the self-decoration recycled aggregate pervious concrete product is as follows:
example 8:
a self-decoration recycled aggregate pervious concrete product is formed by compounding a recycled aggregate pervious concrete base layer with the thickness of 50mm and a recycled aggregate self-decoration surface layer with the thickness of 10 mm;
the recycled aggregate permeable concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 56 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of 2.36-9.5 mm, 8 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of less than or equal to 2.36mm and 8 parts by weight of water;
the recycled aggregate self-decoration surface layer is formed by mixing 20 parts by weight of white cement, 80 parts by weight of building waste recycled decoration aggregate of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water.
Example 9:
a self-decoration recycled aggregate pervious concrete product is formed by compounding a recycled aggregate pervious concrete base layer with the thickness of 65mm and a recycled aggregate self-decoration surface layer with the thickness of 15 mm;
the recycled aggregate permeable concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 72 parts by weight of recycled aggregate of concrete or/and mortar type construction waste with the particle size of 2.36-9.5 mm, 24 parts by weight of recycled aggregate of concrete or/and mortar type construction waste with the particle size of less than or equal to 2.36mm and 8 parts by weight of water;
the recycled aggregate self-decoration surface layer is formed by mixing 20 parts by weight of white cement, 120 parts by weight of building waste recycled decoration aggregate of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water.
Example 10:
a self-decoration recycled aggregate pervious concrete product is formed by compounding a recycled aggregate pervious concrete base layer with the thickness of 57mm and a recycled aggregate self-decoration surface layer with the thickness of 13 mm;
the recycled aggregate permeable concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 64 parts by weight of recycled aggregates of concrete or/and mortar type construction waste with the particle size of 2.36-9.5 mm, 16 parts by weight of recycled aggregates of concrete or/and mortar type construction waste with the particle size of less than or equal to 2.36mm and 8 parts by weight of water;
the recycled aggregate self-decoration surface layer is formed by mixing 20 parts by weight of white cement, 100 parts by weight of building waste recycled decoration aggregate of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water.
Examples 11 to 17:
a self-decoration recycled aggregate pervious concrete product is formed by compounding a recycled aggregate pervious concrete base layer with the thickness of 50-65 mm and a recycled aggregate self-decoration surface layer with the thickness of 10-15 mm; the specific thicknesses (mm) of the layers in each example are given in the following table:
the recycled aggregate permeable concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 56-72 parts by weight of concrete or/and mortar type construction waste recycled aggregate (hereinafter referred to as recycled aggregate 1) with the particle size of 2.36 mm-9.5 mm, 8-24 parts by weight of concrete or/and mortar type construction waste recycled aggregate (hereinafter referred to as recycled aggregate 2) with the particle size of less than or equal to 2.36mm and 8 parts by weight of water; the specific weight parts of the raw materials used in the examples are as follows:
the recycled aggregate self-decoration surface layer is formed by mixing 20 parts by weight of white cement, 80-120 parts by weight of building waste recycled decoration aggregate of a mixture of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water; the specific weight parts of the raw materials used in the examples are as follows:
in the above embodiment: the preparation method of the construction waste recycled aggregate comprises the following steps: recovering the construction waste, and sorting out concrete, mortar construction waste and sintered brick, tile, glass and ceramic construction waste; crushing concrete and mortar building waste, and respectively screening particles with the particle size of 2.36-9.5 mm and the particle size of less than or equal to 2.36mm as building waste recycled aggregate for the recycled aggregate permeable concrete base layer; and (3) crushing the building garbage of sintered bricks, tiles, glass and ceramics, screening out particles with the particle size less than or equal to 2.36mm, and using the particles as the building garbage recycled decorative aggregate for the self-decorative surface layer of the recycled aggregate.
In the above embodiment: the strength grade of the ordinary portland cement is not lower than 42.5 MPa. For example: southwest cement p.o425 ordinary portland cement; sichuan Emei Sheng P.O425R ordinary portland cement; p.o525r portland cement by ralkyo corporation.
In the above embodiment: the white cement is P.W.52.5-grade white cement (Alibo brand) or P.W.42.5-grade white cement (Alibo brand) produced by Aliboportland (Anqing) Co.
Example 18:
a preparation method of a self-decoration recycled aggregate pervious concrete product comprises the following steps:
a. preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 56 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of 2.36-9.5 mm, 8 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of less than or equal to 2.36mm and 8 parts by weight of water as the raw materials of the recycled aggregate permeable concrete base layer;
taking raw materials of each component according to the mixture ratio of 20 parts by weight of white cement, 80 parts by weight of building waste recycled decorative aggregate of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water as the raw materials of a recycled aggregate self-decoration surface layer;
b. stirring and mixing: b, respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the preparation raw materials weighed in the step a to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
c. material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is 10 mm; paving the recycled aggregate permeable concrete base layer mixture on the recycled aggregate self-decoration surface layer mixture for compounding, wherein the paving thickness is 50mm, and obtaining a double-layer compound mixture;
d. molding: pressing and molding the double-layer composite mixture obtained in the step c under the pressure of 2MPa, and demolding to obtain a molded blank;
e. and (5) maintenance: and curing the formed blank body for 28 days in an environment with the temperature of 25 ℃ and the humidity of 50 percent to obtain the self-decoration recycled aggregate pervious concrete product.
Example 19:
a preparation method of a self-decoration recycled aggregate pervious concrete product comprises the following steps:
a. preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 72 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of 2.36-9.5 mm, 24 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of less than or equal to 2.36mm and 8 parts by weight of water as the raw materials of the recycled aggregate permeable concrete base layer;
taking raw materials of each component according to the mixture ratio of 20 parts by weight of white cement, 120 parts by weight of building waste recycled decorative aggregate of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water as the raw materials of the recycled aggregate self-decoration surface layer;
b. stirring and mixing: b, respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the preparation raw materials weighed in the step a to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
c. material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is 15 mm; paving the recycled aggregate permeable concrete base layer mixture on the recycled aggregate self-decoration surface layer mixture for compounding, wherein the paving thickness is 65mm, and obtaining a double-layer compound mixture;
d. molding: pressing and molding the double-layer composite mixture obtained in the step c under the pressure of 5MPa, and demolding to obtain a molded blank;
e. and (5) maintenance: and curing the formed blank body for 28 days in an environment with the temperature of 15 ℃ and the humidity of 90 percent to obtain the self-decoration recycled aggregate pervious concrete product.
Example 20:
a preparation method of a self-decoration recycled aggregate pervious concrete product comprises the following steps:
a. preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 64 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of 2.36-9.5 mm, 16 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of less than or equal to 2.36mm and 8 parts by weight of water as the raw materials of the recycled aggregate permeable concrete base layer;
taking raw materials of each component according to the proportion of 20 parts by weight of white cement, 100 parts by weight of building waste recycled decorative aggregate of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water as the raw materials of the recycled aggregate self-decoration surface layer;
b. stirring and mixing: b, respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the preparation raw materials weighed in the step a to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
c. material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is 12 mm; paving the recycled aggregate permeable concrete base layer mixture on the recycled aggregate self-decoration surface layer mixture for compounding, wherein the paving thickness is 57mm, and obtaining a double-layer compound mixture;
d. molding: pressing and molding the double-layer composite mixture obtained in the step c under the pressure of 4MPa, and demolding to obtain a molded blank;
e. and (5) maintenance: and curing the formed blank body for 28 days in an environment with the temperature of 20 ℃ and the humidity of 70 percent to obtain the self-decoration recycled aggregate pervious concrete product.
Example 21:
a preparation method of a self-decoration recycled aggregate pervious concrete product comprises the following steps:
a. preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 56-72 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of 2.36-9.5 mm, 8-24 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of less than or equal to 2.36mm and 8 parts by weight of water as the raw material of the recycled aggregate permeable concrete base layer;
taking raw materials of each component according to the proportion of 20 parts by weight of white cement, 80-120 parts by weight of building waste recycled decorative aggregate of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water as raw materials of a recycled aggregate self-decoration surface layer;
b. stirring and mixing: b, respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the preparation raw materials weighed in the step a to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
c. material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is 10-15 mm; paving the recycled aggregate permeable concrete base layer mixture on the recycled aggregate self-decoration surface layer mixture for compounding, wherein the paving thickness is 50-65 mm, and obtaining a double-layer compound mixture;
d. molding: pressing and molding the double-layer composite mixture obtained in the step c under the pressure of 2-5 MPa, and demolding to obtain a molded blank;
e. and (5) maintenance: and (3) placing the formed blank in an environment with the temperature of 15-25 ℃ and the humidity of 50-90% for curing for 28 days to obtain the self-decoration recycled aggregate pervious concrete product.
Examples 22 to 28:
a preparation method of a self-decoration recycled aggregate pervious concrete product comprises the following steps:
a. preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 56-72 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of 2.36-9.5 mm, 8-24 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of less than or equal to 2.36mm and 8 parts by weight of water as the raw material of the recycled aggregate permeable concrete base layer; the specific weight parts of the raw materials in each example are the same as those in any one of examples 11 to 17, and are omitted;
taking raw materials of each component according to the proportion of 20 parts by weight of white cement, 80-120 parts by weight of building waste recycled decorative aggregate of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water as raw materials of a recycled aggregate self-decoration surface layer; the specific weight parts of the raw materials in each example are the same as those in any one of examples 11 to 17, and are omitted;
b. stirring and mixing: b, respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the preparation raw materials weighed in the step a to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
c. material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is 10-15 mm; paving the recycled aggregate permeable concrete base layer mixture on the recycled aggregate self-decoration surface layer mixture for compounding, wherein the paving thickness is 50-65 mm, and obtaining a double-layer compound mixture; the specific thickness of each layer in each embodiment is the same as that in any one of embodiments 11 to 17, and is omitted; the specific thicknesses (mm) of the layers in each example can also be found in the following table:
d. molding: pressing and molding the double-layer composite mixture obtained in the step c under the pressure of 2-5 MPa, and demolding to obtain a molded blank;
e. and (5) maintenance: and (3) placing the formed blank in an environment with the temperature of 15-25 ℃ and the humidity of 50-90% for curing for 28 days to obtain the self-decoration recycled aggregate pervious concrete product.
In the above embodiments 18 to 28: the preparation method of the construction waste recycled aggregate comprises the following steps: recovering the construction waste, and sorting out concrete, mortar construction waste and sintered brick, tile, glass and ceramic construction waste; crushing concrete and mortar building waste, and respectively screening particles with the particle size of 2.36-9.5 mm and the particle size of less than or equal to 2.36mm as building waste recycled aggregate for the recycled aggregate permeable concrete base layer; and (3) crushing the building garbage of sintered bricks, tiles, glass and ceramics, screening out particles with the particle size less than or equal to 2.36mm, and using the particles as the building garbage recycled decorative aggregate for the self-decorative surface layer of the recycled aggregate.
In the above embodiments 18 to 28: the strength grade of the ordinary portland cement is not lower than 42.5 MPa. For example: southwest cement p.o425 ordinary portland cement; sichuan Emei Sheng P.O425R ordinary portland cement; p.o525r portland cement by ralkyo corporation.
In the above embodiments 18 to 28: the white cement is P.W.52.5-grade white cement (Alibo brand) or P.W.42.5-grade white cement (Alibo brand) produced by Aliboportland (Anqing) Co.
In the above embodiment: all the raw materials are commercially available products.
In the above embodiment: the percentages used, not specifically noted, are weight (mass) percentages or percentages known to those skilled in the art; the parts by weight (mass) may be both grams or kilograms.
In the above embodiment: the process parameters (temperature, humidity, pressure, thickness, etc.) in each step, the numerical values of the raw material dosage of each component, etc. are within the range, and any point can be applicable.
The present invention and the technical contents not specifically described in the above embodiments are the same as the prior art.
The above embodiments only select raw materials with different proportions to prepare the self-decorating recycled aggregate pervious concrete product, and those skilled in the art can easily make different modifications on the basis of these embodiments and apply the general principles described herein to other embodiments without creative efforts, therefore, the present invention is not limited to the above embodiments; those skilled in the art should, in light of the present disclosure, appreciate that many changes and modifications can be made in the invention without departing from the scope thereof; the invention can be implemented and has the good effect.
Claims (4)
1. A self-decoration recycled aggregate pervious concrete product is characterized in that: the self-decoration recycled aggregate pervious concrete product is formed by compounding a recycled aggregate pervious concrete base layer with the thickness of 50-65 mm and a recycled aggregate self-decoration surface layer with the thickness of 10-15 mm;
the recycled aggregate permeable concrete base layer is formed by mixing 20 parts by weight of ordinary portland cement, 56-72 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of 2.36-9.5 mm, 8-24 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of less than or equal to 2.36mm and 8 parts by weight of water;
the recycled aggregate self-decoration surface layer is formed by mixing 20 parts by weight of white cement, 80-120 parts by weight of building waste recycled decoration aggregate of a mixture of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water;
the preparation method of the construction waste recycled aggregate comprises the following steps: recovering the construction waste, and sorting out concrete, mortar construction waste and sintered brick, tile, glass and ceramic construction waste; crushing concrete and mortar building waste, and respectively screening particles with the particle size of 2.36-9.5 mm and the particle size of less than or equal to 2.36mm as building waste recycled aggregate for the recycled aggregate permeable concrete base layer; and (3) crushing the building garbage of sintered bricks, tiles, glass and ceramics, screening out particles with the particle size less than or equal to 2.36mm, and using the particles as the building garbage recycled decorative aggregate for the self-decorative surface layer of the recycled aggregate.
2. The self-decorating recycled aggregate pervious concrete product of claim 1, wherein: the strength grade of the ordinary portland cement is not lower than 42.5 MPa.
3. A preparation method of a self-decoration recycled aggregate pervious concrete product is characterized by comprising the following steps:
a. preparing materials: taking raw materials of each component according to the mixture ratio of 20 parts by weight of ordinary portland cement, 56-72 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of 2.36-9.5 mm, 8-24 parts by weight of concrete or/and mortar type construction waste recycled aggregate with the particle size of less than or equal to 2.36mm and 8 parts by weight of water as the raw material of the recycled aggregate permeable concrete base layer;
taking raw materials of each component according to the proportion of 20 parts by weight of white cement, 80-120 parts by weight of building waste recycled decorative aggregate of one or more than two of sintered bricks, tiles, glass and ceramics with the particle size of less than or equal to 2.36mm and 10 parts by weight of water as raw materials of a recycled aggregate self-decoration surface layer;
the preparation method of the construction waste recycled aggregate comprises the following steps: recovering the construction waste, and sorting out concrete, mortar construction waste and sintered brick, tile, glass and ceramic construction waste; crushing concrete and mortar building waste, and respectively screening particles with the particle size of 2.36-9.5 mm and the particle size of less than or equal to 2.36mm as building waste recycled aggregate for the recycled aggregate permeable concrete base layer; crushing the building garbage of sintered bricks, tiles, glass and ceramics, screening out particles with the particle size less than or equal to 2.36mm, and using the particles as building garbage recycled decorative aggregate for the self-decoration surface layer of the recycled aggregate;
b. stirring and mixing: b, respectively mixing and stirring the raw materials of the recycled aggregate pervious concrete base layer and the raw materials of the recycled aggregate self-decorating surface layer according to the preparation raw materials weighed in the step a to respectively prepare a recycled aggregate pervious concrete base layer mixture and a recycled aggregate self-decorating surface layer mixture;
c. material distribution: paving the recycled aggregate self-decoration surface layer mixture at the bottom of the steel mould, wherein the paving thickness is 10-15 mm; paving the recycled aggregate permeable concrete base layer mixture on the recycled aggregate self-decoration surface layer mixture for compounding, wherein the paving thickness is 50-65 mm, and obtaining a double-layer compound mixture;
d. molding: pressing and molding the double-layer composite mixture obtained in the step c under the pressure of 2-5 MPa, and demolding to obtain a molded blank;
e. and (5) maintenance: and (3) placing the formed blank in an environment with the temperature of 15-25 ℃ and the humidity of 50-90% for curing for 28 days to obtain the self-decoration recycled aggregate pervious concrete product.
4. The method for preparing the self-decorating recycled aggregate pervious concrete product as claimed in claim 3, which is characterized in that: the strength grade of the ordinary portland cement is not lower than 42.5 MPa.
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| CN108975803A (en) * | 2018-07-24 | 2018-12-11 | 成都建工预筑科技有限公司 | A kind of non-fading paving plate and its preparation process |
| CN108821698A (en) * | 2018-08-09 | 2018-11-16 | 棕榈生态城镇发展股份有限公司 | A kind of pervious concrete preformed bricks and preparation method thereof |
| CN109371774A (en) * | 2018-11-30 | 2019-02-22 | 厦门固泽环保科技有限公司 | A kind of luminous pervious concrete pavement |
| CN112174582A (en) * | 2020-08-26 | 2021-01-05 | 北京鼎创科技环保集团有限公司 | Method for producing imitation stone from waste granite |
| CN113716909B (en) * | 2021-08-11 | 2022-10-21 | 绍兴职业技术学院 | Method for preparing high-elastic-modulus water-permeable mortar based on urban building waste |
| CN113897834B (en) * | 2021-11-23 | 2023-01-24 | 中电建铁路建设投资集团有限公司 | Waste concrete baking-free brick and manufacturing method thereof |
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