CN112500046A - Preparation process of multifunctional high-performance special concrete pavement brick - Google Patents
Preparation process of multifunctional high-performance special concrete pavement brick Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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Abstract
The invention discloses a preparation process of a multifunctional high-performance special concrete pavement brick, which comprises the following steps: (1) preparing raw materials; (2) mixing raw materials: (3) vibrating the mixture; (4) preparing a pavement brick; (5) maintaining the pavement bricks; the preparation process of the multifunctional high-performance special concrete pavement brick provided by the invention can improve the water permeability of the pavement brick and is convenient for keeping the surface of the pavement brick dry.
Description
Technical Field
The invention belongs to the technical field of pavement brick production, and particularly relates to a preparation process of a multifunctional high-performance special concrete pavement brick.
Background
The paving brick is made of cement and aggregate as main raw materials through processing, vibration pressing or other forming processes, and is used for paving concrete pavements of urban road sidewalks, urban squares and the like and blocks, plates and the like of ground engineering. The surface of the material can be coated or not coated; natural or colored. Including other product materials (e.g., flooring) used to pave urban road sidewalks, urban squares, etc.
Chinese patent (publication No. CN109704713A, publication No. 2019.05.03) discloses a preparation process of a concrete pavement brick, which comprises a backing material and a fabric, and is characterized in that: the base material comprises the following raw materials in parts by weight: building garbage aggregate: 42-55 parts; crushed stone 0-5 mm: 10-15 parts; mixing water granulated slag: 14-20 parts; 10-15 parts of cement P.C 32.5; fly ash: 5-8 parts; gelling agent: 3-5 parts; water-swelling inorganic: 1.5-4.5 parts; 0.6 to 1.5 percent of polycarboxylic acid water reducing agent powder; 0.3 to 0.6 percent of sulfamate water reducing agent powder; 0.2-0.4 part of dispersant; the performance defects of the aggregate are effectively eliminated through the synergistic effect of the materials and the control of humidity, vibration, pressure and the like in the production process; the crystal structure is remolded, and the strength is improved; therefore, the construction waste is effectively utilized, the cost is saved, the material defects are overcome through the interaction between the process and the materials, and the pavement brick with high strength and excellent performance is prepared. However, the construction waste aggregate is not further treated in the preparation process of the pavement brick, but is directly used as the fine aggregate of the pavement brick, and the water permeability of the construction waste aggregate is poor, so that the surface of the pavement brick is easy to retain water and is not easy to dry, and pedestrians can slip due to the water on the pavement brick.
Disclosure of Invention
The invention aims to provide a preparation process of a multifunctional high-performance special concrete pavement brick, which aims to overcome the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a preparation process of a multifunctional high-performance special concrete pavement brick comprises the following steps:
(1) preparing raw materials: screening the raw materials by a 20-mesh screen, wherein the raw materials comprise the following components in parts by weight: 60-70 parts of building waste aggregate, 8-12 parts of cement, 15-20 parts of gypsum, 1-2 parts of retarder, 0.1-0.2 part of dispersant and 20-25 parts of water, wherein the raw materials are prepared according to the mass parts of the components for later use, the components are more easily and uniformly distributed by using the raw materials with smaller particle diameters, the retarder can prolong the hydration hardening time of the cement, so that the pavement brick can keep plasticity for a longer time, and the surface of the pavement brick is convenient to indentation, the dispersant is beneficial to crushing particles and preventing the crushed particles from coagulating to keep the dispersion stable, so that the components of the pavement brick are uniformly distributed, and the gypsum can ensure that the porosity of the pavement brick is high after the pavement brick is hardened, so that the water permeability of the pavement brick is enhanced, and the cement can improve the porosity state of the gypsum in the pavement brick or ensure that the hole wall has hydrophobicity;
(2) mixing raw materials: putting the building waste aggregate, the cement, the gypsum, the retarder and the dispersing agent in the step (1) into a stirrer for stirring, after stirring for 1-2min, putting water into the stirrer for stirring for 2-3min to obtain a mixture, and stirring the raw materials twice to ensure that all components of the pavement brick are stirred more uniformly, so that the water permeability of the pavement brick is improved;
(3) vibration of the mixture: putting the mixture obtained in the step (2) into a pavement brick mold, and then putting the pavement brick mold with the mixture on a vibration table for vibration treatment for 10-15s to obtain a crude product;
(4) preparing the pavior brick: pressurizing and vibrating the crude product obtained in the step (3), wherein the pressure is 5-6MPa, and the vibration time is 8-10s, so as to obtain a semi-finished product;
(5) maintaining the pavior bricks: and (5) conveying the semi-finished product in the step (4) to a curing field for curing, wherein the curing time is 10-14 d.
It is preferable that: the dispersing agent in the step (1) is one or a mixture of polyethylene wax, copper stearate and vinyl bis-stearamide, and the dispersing agent added into the raw materials can prevent the components of the raw materials from concentrating, so that the reduction of gaps in the pavement brick is avoided, and the improvement of the water permeability of the pavement brick is facilitated.
It is preferable that: the preparation method of the construction waste aggregate in the step (1) comprises the following steps:
1) crushing the building waste aggregate, then putting the crushed building waste aggregate into a ball mill for grinding, screening the ground material through a 40-mesh screen, and mixing the screened material with water according to the weight ratio of 1: 4, putting the mixture into a stirrer to be mixed and stirred for 6-8min to obtain a mixed solution;
2) putting plant ash into a ball mill for grinding, then screening ground substances through a 400-mesh screen, and mixing the screen mesh with carbide slag slurry according to the weight ratio of 1: 10 in mass ratio, putting the mixture into a stirrer to be mixed and stirred for 4-7min to obtain mixed slurry, carrying out ultrasonic oscillation treatment on the mixed slurry with the ultrasonic frequency of 55-60MHz, and finally placing the mixed slurry into a reaction kettle to stand for 4-5h to obtain a reinforcing liquid;
3) mixing the mixed solution in the step 1) and the enhancement solution in the step 2) according to the ratio of 1: 1, placing the mixture into a reaction kettle, standing for 1-1.5 hours to obtain aggregate slurry, and mixing the reinforcing liquid with the mixed liquid to enable the prepared aggregate slurry to form gaps more easily after hardening, so that the water permeability of the construction waste is increased, the waste of the waste construction waste is conveniently utilized, and the production cost of the pavement bricks can be reduced;
4) and (3) carrying out solid-liquid separation on the aggregate slurry in the step (3) through a 300-mesh screen, and placing the screened solid into a drying box for drying at the drying temperature of 150-170 ℃ for 5-6h to obtain the building garbage aggregate in the step (1).
It is preferable that: the retarder in the step (1) is one or a mixture of more of phosphate, calcium saccharate, lignosulfonate and citric acid.
It is preferable that: the raw materials comprise the following components in parts by weight: 60 parts of building waste aggregate, 8 parts of cement, 15 parts of gypsum, 1 part of retarder, 0.1 part of dispersant and 20 parts of water.
It is preferable that: the drying temperature in the step 4) is 150 ℃, and the drying time is 6 h.
It is preferable that: and (4) the pressure in the step (4) is 6MPa, and the vibration time is 8 s.
The invention has the beneficial effects that: the raw materials with smaller particle diameters are used, so that the components are more easily and uniformly distributed, the retarder can prolong the hydration hardening time of cement, the pavement brick can keep plasticity for a longer time, the surface of the pavement brick is convenient to indentation, the dispersing agent is beneficial to crushing particles and preventing the crushed particles from coagulating so as to keep stable dispersion, the components of the pavement brick are uniformly distributed, the gypsum can ensure that the porosity of the pavement brick is high after the pavement brick is hardened, the water permeability of the pavement brick is enhanced, and the cement can improve the pore state of the gypsum in the pavement brick or ensure that the pore wall has hydrophobicity; through twice stirring of the raw materials, all components of the pavement brick are stirred more uniformly, so that the water permeability of the pavement brick is improved conveniently; the dispersing agent added into the raw materials can prevent the concentration of each component of the raw materials, thereby avoiding the reduction of gaps in the pavement bricks and being beneficial to improving the water permeability of the pavement bricks; through mixing the reinforcing liquid and the mixed liquid, gaps are formed more easily after the prepared aggregate slurry is hardened, so that the water permeability of the construction waste is increased, the waste of the waste construction waste is conveniently utilized, and the production cost of the pavement bricks can be reduced. The preparation process of the multifunctional high-performance special concrete pavement brick provided by the invention can improve the water permeability of the pavement brick and is convenient for keeping the surface of the pavement brick dry.
Detailed Description
Example 1
A preparation process of a multifunctional high-performance special concrete pavement brick comprises the following steps:
(1) preparing raw materials: screening the raw materials by a 20-mesh screen, wherein the raw materials comprise the following components in parts by weight: 60 parts of building waste aggregate, 8 parts of cement, 15 parts of gypsum, 1 part of retarder, 0.1 part of dispersant and 20 parts of water, and the raw materials are mixed for later use according to the mass parts of the components;
(2) mixing raw materials: putting the building waste aggregate, the cement, the gypsum, the retarder and the dispersing agent in the step (1) into a stirrer to be stirred for 1min, putting water into the stirrer to be stirred for 2min, and obtaining a mixture;
(3) vibration of the mixture: putting the mixture obtained in the step (2) into a pavement brick mold, and then putting the pavement brick mold with the mixture on a vibration table for vibration treatment for 10s to obtain a rough finished product;
(4) preparing the pavior brick: pressurizing and vibrating the crude product obtained in the step (3), wherein the pressure is 5MPa, and the vibration time is 8s, so as to obtain a semi-finished product;
(5) maintaining the pavior bricks: and (5) conveying the semi-finished product in the step (4) to a curing field for curing, wherein the curing time is 10 days.
The dispersing agent in the step (1) is a mixture of polyethylene wax and copper stearate.
The preparation method of the construction waste aggregate in the step (1) comprises the following steps:
1) crushing the building waste aggregate, then putting the crushed building waste aggregate into a ball mill for grinding, screening the ground material through a 40-mesh screen, and mixing the screened material with water according to the weight ratio of 1: 4, putting the mixture into a stirrer to be mixed and stirred for 6min to obtain a mixed solution;
2) putting plant ash into a ball mill for grinding, then screening ground substances through a 400-mesh screen, and mixing the screen mesh with carbide slag slurry according to the weight ratio of 1: 10, mixing and stirring in a stirrer for 4-min to obtain mixed slurry, carrying out ultrasonic oscillation treatment on the mixed slurry with the ultrasonic frequency of 55MHz, and finally placing the mixed slurry in a reaction kettle for standing for 4h to obtain a reinforcing liquid;
3) mixing the mixed solution in the step 1) and the enhancement solution in the step 2) according to the ratio of 1: 1, mixing and stirring the mixture in a stirrer, and standing the mixture in a reaction kettle for 1 hour to obtain aggregate slurry;
4) and (3) carrying out solid-liquid separation on the aggregate slurry in the step (3) through a 300-mesh screen, and placing the screened solid into a drying box for drying at the drying temperature of 150 ℃ for 5h to obtain the building waste aggregate in the step (1).
The retarder in the step (1) is a mixture of various phosphates, calcium saccharate and lignosulfonate.
Example 2
A preparation process of a multifunctional high-performance special concrete pavement brick is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing raw materials: screening the raw materials by a 20-mesh screen, wherein the raw materials comprise the following components in parts by weight: 65 parts of building waste aggregate, 10 parts of cement, 18 parts of gypsum, 2 parts of retarder, 0.2 part of dispersant and 23 parts of water, and mixing the raw materials according to the mass parts of the components for later use;
(2) mixing raw materials: putting the building waste aggregate, the cement, the gypsum, the retarder and the dispersing agent in the step (1) into a stirrer to be stirred for 2min, putting water into the stirrer to be stirred for 2min, and obtaining a mixture;
(3) vibration of the mixture: putting the mixture obtained in the step (2) into a pavement brick mold, and then putting the pavement brick mold with the mixture on a vibration table for vibration treatment for 13s to obtain a rough finished product;
(4) preparing the pavior brick: pressurizing and vibrating the crude product obtained in the step (3), wherein the pressure is 5MPa, and the vibration time is 9s, so as to obtain a semi-finished product;
(5) maintaining the pavior bricks: and (5) conveying the semi-finished product in the step (4) to a curing field for curing, wherein the curing time is 12 d.
The dispersing agent in the step (1) is a mixture of polyethylene wax and vinyl bis stearamide.
The preparation method of the construction waste aggregate in the step (1) comprises the following steps:
1) crushing the building waste aggregate, then putting the crushed building waste aggregate into a ball mill for grinding, screening the ground material through a 40-mesh screen, and mixing the screened material with water according to the weight ratio of 1: 4, putting the mixture into a stirrer to be mixed and stirred for 7min to obtain a mixed solution;
2) putting plant ash into a ball mill for grinding, then screening ground substances through a 400-mesh screen, and mixing the screen mesh with carbide slag slurry according to the weight ratio of 1: 10, mixing and stirring in a stirrer for 5min to obtain mixed slurry, carrying out ultrasonic oscillation treatment on the mixed slurry with the ultrasonic frequency of 58MHz, and finally placing the mixed slurry in a reaction kettle for standing for 5h to obtain a reinforcing liquid;
3) mixing the mixed solution in the step 1) and the enhancement solution in the step 2) according to the ratio of 1: 1, mixing and stirring the mixture in a stirrer, and standing the mixture in a reaction kettle for 1.5 hours to obtain aggregate slurry;
4) and (3) carrying out solid-liquid separation on the aggregate slurry in the step (3) by using a 300-mesh screen, and placing the screened solid into a drying box for drying at the drying temperature of 160 ℃ for 6h to obtain the building waste aggregate in the step (1).
The retarder in the step (1) is a mixture of various phosphates, lignosulfonate and citric acid.
Example 3
A preparation process of a multifunctional high-performance special concrete pavement brick is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing raw materials: screening the raw materials by a 20-mesh screen, wherein the raw materials comprise the following components in parts by weight: 70 parts of building waste aggregate, 12 parts of cement, 20 parts of gypsum, 2 parts of retarder, 0.2 part of dispersant and 25 parts of water, and the raw materials are mixed for later use according to the mass parts of the components;
(2) mixing raw materials: putting the building waste aggregate, the cement, the gypsum, the retarder and the dispersing agent in the step (1) into a stirrer to be stirred for 2min, putting water into the stirrer to be stirred for 3min, and obtaining a mixture;
(3) vibration of the mixture: putting the mixture obtained in the step (2) into a pavement brick mold, and then putting the pavement brick mold with the mixture on a vibration table for vibration for 15s to obtain a rough product;
(4) preparing the pavior brick: pressurizing and vibrating the crude product obtained in the step (3), wherein the pressure is 6MPa, and the vibration time is 10s, so as to obtain a semi-finished product;
(5) maintaining the pavior bricks: and (5) conveying the semi-finished product in the step (4) to a curing field for curing, wherein the curing time is 14 d.
The dispersing agent in the step (1) is a mixture of copper stearate and vinyl bis-stearamide.
The preparation method of the construction waste aggregate in the step (1) comprises the following steps:
1) crushing the building waste aggregate, then putting the crushed building waste aggregate into a ball mill for grinding, screening the ground material through a 40-mesh screen, and mixing the screened material with water according to the weight ratio of 1: 4, putting the mixture into a stirrer to be mixed and stirred for 8min to obtain a mixed solution;
2) putting plant ash into a ball mill for grinding, then screening ground substances through a 400-mesh screen, and mixing the screen mesh with carbide slag slurry according to the weight ratio of 1: 10, mixing and stirring in a stirrer for 7min to obtain mixed slurry, carrying out ultrasonic oscillation treatment on the mixed slurry with the ultrasonic frequency of 60MHz, and finally placing the mixed slurry in a reaction kettle for standing for 5h to obtain a reinforcing liquid;
3) mixing the mixed solution in the step 1) and the enhancement solution in the step 2) according to the ratio of 1: 1, mixing and stirring the mixture in a stirrer, and standing the mixture in a reaction kettle for 1.5 hours to obtain aggregate slurry;
4) and (3) carrying out solid-liquid separation on the aggregate slurry in the step (3) by using a 300-mesh screen, and placing the screened solid into a drying box for drying, wherein the drying temperature is 170 ℃, and the drying time is 6 hours, so as to obtain the building waste aggregate in the step (1).
The retarder in the step (1) is a mixture of various calcium saccharate, lignosulfonate and citric acid.
Comparative example 1
Compared with the example 1, the comparative example does not carry out the screening operation in the step (1), and directly carries out the batching for later use according to the raw material composition and the mass parts of the components, except that the steps of the other methods are the same.
Comparative example 2
In this comparative example, compared with example 2, the operations of steps 2) and 3) were not performed, and the mixed solution in step 1) was directly subjected to the operation of step 4), except that the other steps of the method were the same.
Comparative example 3
Compared with the embodiment 3, the operation of the step 1) is not carried out, and the operation of the step 3) is directly carried out on the ground building rubbish aggregate and the reinforcing liquid in the step 2), except that the steps of the method are the same.
Control group
Adopts the road surface brick sold in the market.
Experiments are respectively carried out by using the 7 road bricks according to the test method of the water permeability coefficient of GB/T25993-:
TABLE 1
As can be seen from Table 1, the average value of the water permeability coefficient of the pavement bricks in the embodiment is far higher than the average value of the water permeability coefficient of the pavement bricks in the comparative example and the comparative group, so that the preparation process of the multifunctional high-performance special concrete pavement brick provided by the invention can improve the water permeability of the pavement brick and is convenient for keeping the surface of the pavement brick dry.
The above description is only for the preferred embodiment of the present invention, but the present invention is not limited to the scope of the implementation, and all the equivalent embodiments changed or modified according to the concept of the present invention should be within the scope of the protection of the present invention without departing from the spirit covered by the description and the embodiments.
Claims (7)
1. A preparation process of a multifunctional high-performance special concrete pavement brick is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing raw materials: screening the raw materials by a 20-mesh screen, wherein the raw materials comprise the following components in parts by weight: 60-70 parts of building waste aggregate, 8-12 parts of cement, 15-20 parts of gypsum, 1-2 parts of retarder, 0.1-0.2 part of dispersant and 20-25 parts of water, and the raw materials are mixed for later use according to the mass parts of the components;
(2) mixing raw materials: putting the building waste aggregate, the cement, the gypsum, the retarder and the dispersing agent in the step (1) into a stirrer to be stirred for 1-2min, putting water into the stirrer to be stirred for 2-3min, and obtaining a mixture;
(3) vibration of the mixture: putting the mixture obtained in the step (2) into a pavement brick mold, and then putting the pavement brick mold with the mixture on a vibration table for vibration treatment for 10-15s to obtain a crude product;
(4) preparing the pavior brick: pressurizing and vibrating the crude product obtained in the step (3), wherein the pressure is 5-6MPa, and the vibration time is 8-10s, so as to obtain a semi-finished product;
(5) maintaining the pavior bricks: and (5) conveying the semi-finished product in the step (4) to a curing field for curing, wherein the curing time is 10-14 d.
2. The process for preparing the multifunctional high-performance special concrete pavement brick according to claim 1, wherein the process comprises the following steps: the dispersing agent in the step (1) is one or a mixture of polyethylene wax, copper stearate and vinyl bis-stearamide.
3. The process for preparing the multifunctional high-performance special concrete pavement brick according to claim 1, wherein the process comprises the following steps: the preparation method of the construction waste aggregate in the step (1) comprises the following steps:
1) crushing the building waste aggregate, then putting the crushed building waste aggregate into a ball mill for grinding, screening the ground material through a 40-mesh screen, and mixing the screened material with water according to the weight ratio of 1: 4, putting the mixture into a stirrer to be mixed and stirred for 6-8min to obtain a mixed solution;
2) putting plant ash into a ball mill for grinding, then screening ground substances through a 400-mesh screen, and mixing the screen mesh with carbide slag slurry according to the weight ratio of 1: 10 in mass ratio, putting the mixture into a stirrer to be mixed and stirred for 4-7min to obtain mixed slurry, carrying out ultrasonic oscillation treatment on the mixed slurry with the ultrasonic frequency of 55-60MHz, and finally placing the mixed slurry into a reaction kettle to stand for 4-5h to obtain a reinforcing liquid;
3) mixing the mixed solution in the step 1) and the enhancement solution in the step 2) according to the ratio of 1: 1, mixing and stirring the mixture in a stirrer, placing the mixture in a reaction kettle, and standing for 1-1.5 hours to obtain aggregate slurry;
4) and (3) carrying out solid-liquid separation on the aggregate slurry in the step (3) through a 300-mesh screen, and placing the screened solid into a drying box for drying at the drying temperature of 150-170 ℃ for 5-6h to obtain the building garbage aggregate in the step (1).
4. The process for preparing the multifunctional high-performance special concrete pavement brick according to claim 1, wherein the process comprises the following steps: the retarder in the step (1) is one or a mixture of more of phosphate, calcium saccharate, lignosulfonate and citric acid.
5. The process for preparing the multifunctional high-performance special concrete pavement brick according to claim 1, wherein the process comprises the following steps: the raw materials comprise the following components in parts by weight: 60 parts of building waste aggregate, 8 parts of cement, 15 parts of gypsum, 1 part of retarder, 0.1 part of dispersant and 20 parts of water.
6. The preparation process of the multifunctional high-performance special concrete pavement brick as claimed in claim 3, wherein the preparation process comprises the following steps: the drying temperature in the step 4) is 150 ℃, and the drying time is 6 h.
7. The preparation process of the multifunctional high-performance special concrete pavement brick as claimed in claim 3, wherein the preparation process comprises the following steps: and (4) the pressure in the step (4) is 6MPa, and the vibration time is 8 s.
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