Water permeable brick with high water permeable rate and forming process thereof

Abstract

The invention discloses a water permeable brick with a high water permeable rate and a forming process thereof, and belongs to the field of water permeable bricks, the water permeable brick comprises a surface layer and an aggregate layer, and is characterized in that the surface layer comprises cement, fine sand and a water reducing agent, and the surface of the fine sand is rough; the aggregate layer comprises gravels, mineral powder, fly ash and cement, and the surfaces of the gravels are treated by a sand making machine to form micropores and coarse structures; fine sand and broken stone are treated through a sand making machine, so that fine sand particles are uniform, the surface of the fine sand is rough, more micropores and rough structures are formed on the surface of the broken stone, the bonding force between a surface layer and an aggregate layer is increased, the contact area and friction force between aggregates are increased, and therefore the structural stability and strength of the water permeable brick are improved; according to the invention, a high-pressure vibration molding process is adopted, and the vibration pressure and frequency are reasonably set, so that an aggregate mixture is closely stacked, more communicated pores are formed, and the water permeation rate of the water permeable brick is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of permeable bricks, in particular to a permeable brick with a high water permeability rate and a forming process thereof. Background Art

[0002] Permeable bricks are widely used in urban construction as an environmentally friendly building material that allows rainwater to quickly seep into the ground, replenishing soil and groundwater, maintaining soil moisture, and improving the living conditions of urban ground plants and soil microorganisms. However, traditional permeable bricks suffer from problems such as insufficient water permeability and structural stability during the molding process.

[0003] In the existing technology, the aggregate is pretreated and then mixed with the binder to form the mixture. Although the permeability of the permeable brick is improved to a certain extent, the aggregate treatment method used in this method is relatively traditional, and the molding process adopts ordinary vibration molding, resulting in the permeability rate and strength of the permeable brick still having room for improvement.

[0004] In order to further improve the performance of permeable bricks and meet the demand for high-quality permeable bricks in modern urban construction, the present invention proposes a permeable brick with a high water permeability rate and a forming process thereof. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a high water permeability permeable brick and a forming process thereof to solve the problems of low water permeability and insufficient structural stability of traditional permeable bricks raised in the above background technology.

[0006] Technical solution: In order to solve the above technical problems, according to one aspect of the present invention, more specifically, a high water permeability permeable brick is provided, which is composed of a surface layer and an aggregate layer. The surface layer includes cement, fine sand, fly ash, and a water reducer, and the surface of the fine sand is rough; the aggregate layer includes crushed stone, mineral powder, and cement, and the surface of the crushed stone is processed by a sand making machine to form micropores and a rough structure.

[0007] According to another aspect of the present invention, more specifically, a high water permeability permeable brick and a forming process thereof include the following steps:

[0008] S1. Raw material preparation:

[0009] Surface layer materials: By weight, select 15 parts cement, 30 parts fine sand, 1.5 parts water reducer, and 5 parts water. The fine sand has a particle size of 0.1-0.5 mm and is obtained by crushing and screening natural sand in a sand making machine. This ensures uniform particle size and a rough surface, which helps improve the adhesion between the surface layer and the aggregate layer.

[0010] Aggregate Raw Materials: By weight, select 40-60 parts of crushed stone with a particle size of 2-5mm, 30-50 parts of crushed stone with a particle size of 5-10mm, 10-20 parts of cement, and 5-10 parts of water. The crushed stone is pre-treated using a sand making machine to moderately crush the surface, forming more micropores and a rough structure, thereby increasing the contact area and friction between the aggregates.

[0011] S2. Preparation of surface layer: Add cement, fine sand, fly ash and water reducing agent in the surface layer raw materials into the mixer, stir evenly, then slowly add water and continue stirring for 5-10 minutes to form a uniform surface layer slurry.

[0012] S3. Aggregate preparation: Add two kinds of crushed stone and cement in the aggregate raw materials into the mixer, mix them evenly, then add water and stir for 3-5 minutes to make the cement evenly wrap the surface of the crushed stone to form an aggregate mixture.

[0013] S4. Mold preparation: Select a mold with a specific shape and size, and apply a release agent to the inner wall of the mold to facilitate subsequent demolding.

[0014] S5. Forming: Evenly spread the surface slurry on the bottom of the mold to a thickness of 5-10mm. Then fill the mold with the aggregate mixture. Once filled, use high-pressure vibration molding equipment to vibrate and form. The vibration pressure is 5-10MPa, the vibration frequency is 20-50Hz, and the vibration time is 28 seconds. The high-pressure vibration causes the aggregate mixture to be tightly packed, and the surface slurry and aggregate layer are fully bonded, forming a permeable brick body with high water permeability and high strength.

[0015] S6. Curing: Place the formed brick body in a curing room and cure it for 7-14 days at a temperature of 20-30°C and a humidity of 80%-90% to fully harden the brick body and improve the strength and durability of the permeable brick.

[0016] The beneficial effects of the high water permeability permeable brick and its forming process of the present invention are:

[0017] (1) The present invention processes fine sand and gravel through a sand making machine, so that the fine sand particles are uniform and the surface is rough, and more micropores and rough structures are formed on the surface of the gravel, thereby increasing the bonding force between the surface layer and the aggregate layer, as well as the contact area and friction between the aggregates, thereby improving the structural stability and strength of the permeable bricks.

[0018] (2) The present invention adopts a high-pressure vibration molding process. The reasonable setting of vibration pressure and frequency makes the aggregate mixture compactly stacked, forming more interconnected pores and significantly improving the water permeability of the permeable brick. The addition of fly ash to the raw materials not only reduces the production cost, but also realizes the comprehensive utilization of industrial waste residue, which meets the requirements of environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0020] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0022] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figure 1 A high water permeability brick is composed of a surface layer and an aggregate layer. The surface layer includes cement, fine sand, fly ash, and a water reducer. The surface of the fine sand is rough. The aggregate layer includes crushed stone, mineral powder, and cement. The surface of the crushed stone is processed by a sand making machine to form micropores and a rough structure.

[0024] Example 1

[0025] Raw material preparation

[0026] Surface layer: 25kg cement, 20kg fine sand, 8kg fly ash, 0.5kg water reducer, 8kg water (fine sand particle size 0.2-0.6mm, processed by sand making machine to a rough surface);

[0027] Aggregate: 40kg of 2-5mm crushed stone, 30kg of 5-10mm crushed stone, 12kg of cement, 6kg of water (the surface of the crushed stone is pre-treated by a sand making machine to form micropores and a rough structure).

[0028] Preparation of the topping: Add the topping ingredients into a blender, stir the dry ingredients evenly, then add water and continue stirring for 5 minutes to form a uniform topping slurry.

[0029] Aggregate preparation: Add the aggregate raw materials into the mixer, mix the dry materials evenly, then add water and stir for 3 minutes to form an aggregate mixture with cement evenly coating the crushed stone.

[0030] Mold preparation: Apply release agent to the inner wall of the mold to facilitate subsequent demolding.

[0031] Molding: Spread the surface slurry on the bottom of the mold with a thickness of 5mm. After filling in the aggregate mixture, use high-pressure vibration molding equipment with a vibration pressure of 4MPa, a frequency of 25Hz, and a vibration time of 28 seconds to make the aggregates densely stacked and the surface layer and the aggregate layer fully bonded to form a brick body.

[0032] Curing: Place the bricks in a curing room and cure them at a temperature of 22°C and a humidity of 80% for 7 days.

[0033] Performance effect: This embodiment adopts basic graded raw materials and medium-low strength molding parameters, and the permeable bricks produced have a permeability coefficient of 0.2 cm / s and a compressive strength of 20 MPa, which is significantly improved compared with conventional permeable bricks, verifying the basic feasibility of sand making machine processing aggregates and high-pressure vibration technology.

[0034] Example 2

[0035] Raw materials preparation:

[0036] Surface layer raw materials: cement 40kg, fine sand 25kg, fly ash 15kg, water reducer 0.8kg, water 13kg (fine sand treatment is the same as above);

[0037] Aggregate raw materials: 50kg of 2-5mm crushed stone, 40kg of 5-10mm crushed stone, 15kg of cement, and 8kg of water (pretreatment of crushed stone is the same as above).

[0038] Preparation of the surface layer: Stir for 8 minutes to form a fine and uniform surface layer slurry.

[0039] Aggregate preparation: Mix for 4 minutes to ensure that the cement completely covers the surface of the gravel.

[0040] Molding: Vibration pressure 6.5MPa, frequency 38Hz, vibration time 28 seconds, through high frequency and high pressure action to achieve efficient aggregate stacking and interface bonding.

[0041] Maintenance: Temperature 25℃, humidity 85%, maintenance for 10 days.

[0042] Performance effect: By adopting balanced proportions and optimized grading, the permeability coefficient is increased to 0.25cm / s and the compressive strength reaches 28MPa, which reflects the synergistic improvement of the process parameter combination on permeability and structural strength. It is suitable for medium-load scenarios such as municipal roads and parking lots.

[0043] Example 3

[0044] Raw material preparation

[0045] Surface layer raw materials: cement 50kg, fine sand 30kg, fly ash 20kg, water reducer 1kg, water 15kg (fine sand treatment is the same as above);

[0046] Aggregate raw materials: 60kg of 2-5mm crushed stone, 50kg of 5-10mm crushed stone, 20kg of cement, and 10kg of water (the pretreatment of crushed stone is the same as above).

[0047] Preparation of surface layer: Stirring time is 10 minutes to ensure that the slurry is fully homogenized.

[0048] Aggregate preparation: Mixing time is 5 minutes to form a high-strength aggregate skeleton.

[0049] Molding: Vibration pressure 10MPa, frequency 50Hz, vibration time 28s, through the extreme parameters to achieve the tight interlocking of aggregate particles and optimization of pore connectivity.

[0050] Maintenance: Temperature 30℃, humidity 90%, maintenance for 14 days.

[0051] Performance Effect:

[0052] This embodiment serves as the upper limit of parameter solutions. The water permeability coefficient reaches 0.3 cm / s and the compressive strength is increased to 35 MPa. This verifies the strengthening effect of the deep processing technology of the sand making machine on the interface adhesion, as well as the high efficiency of high-pressure vibration molding in constructing permeable channels. It is suitable for scenarios with extremely high permeability and load-bearing requirements, such as highway auxiliary roads and sponge city core areas.

[0053] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A high water permeability permeable brick, comprising a surface layer and an aggregate layer, characterized in that: The surface layer includes cement, fine sand, and water reducing agent, and the surface of the fine sand is rough; the aggregate layer includes crushed stone, mineral powder, fly ash, and cement, and the surface of the crushed stone is processed by a sand making machine to form micropores and a rough structure.

2. A molding process for high water permeability permeable bricks, characterized in that: The steps include: S1. Raw material preparation: Surface layer materials: by weight, select 15 parts of cement, 30 parts of fine sand, 1.5 parts of water reducer, and 5 parts of water; Aggregate raw materials: by weight, select 55 parts of crushed stone with a particle size of 2-5mm, 35 parts of crushed stone with a particle size of 5-10mm, 5 parts of mineral powder, 5 parts of fly ash, 15 parts of cement, and 5 parts of water. S2. Preparation of surface layer: Add cement, fine sand and water reducing agent in the surface layer raw materials into the mixer, stir evenly, then slowly add water and continue stirring to form a uniform surface layer slurry. S3. Aggregate preparation: Add two kinds of crushed stone with different particle sizes, mineral powder, cement and fly ash in the aggregate raw materials into a mixer, mix them evenly, then add water to make the cement evenly wrap the surface of the crushed stone to form an aggregate mixture. S4. Mold preparation: Select a mold with a specific shape and size, and apply a release agent to the inner wall of the mold to facilitate subsequent demolding. S5. Molding: Fill the aggregate mixture into the mold for pre-compression, then evenly spread the surface slurry on the base material with a thickness of 5-10mm. After filling, use high-pressure vibration molding equipment for vibration molding; Through high-pressure vibration, the aggregate mixture is densely packed, and at the same time the surface slurry is fully bonded to the aggregate layer to form a permeable brick body with high water permeability and high strength. S6. Curing: Place the formed brick body in a curing room for curing to fully harden the brick body, thereby obtaining a permeable brick with excellent strength and durability.

3. The forming process of a high water permeability permeable brick according to claim 2, characterized in that: The particle size of the fine sand is 0.42-0.85 mm, and is obtained by crushing and screening natural sand with a sand making machine. The fine sand particles are uniform and the surface is rough.

4. The forming process of a high water permeability permeable brick according to claim 2, characterized in that: The crushed stone is pre-processed by a sand making machine, and the surface of the crushed stone is moderately crushed to form more micropores and rough structures on the surface, thereby increasing the contact area and friction between the aggregates.

5. The forming process of a high water permeability permeable brick according to claim 2, characterized in that: The mixing time of the surface slurry is 5 minutes, and the mixing time of the aggregate mixture is 3 minutes.

6. The forming process of a high water permeability permeable brick according to claim 2, characterized in that: The temperature in the curing room is 20°C, the humidity is 80%, and the curing time is 7 days.

7. The forming process of a high water permeability permeable brick according to claim 2, characterized in that: The vibration pressure of the high-pressure vibration molding equipment is 10 MPa, the vibration frequency is 45 Hz, and the vibration time is 28 seconds.

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