An environmentally friendly steel slag recycled concrete interconnected pavement brick and its preparation method

Abstract

The present invention relates to an environment-friendly steel slag recycled concrete interconnected pavement brick and a preparation method thereof, which includes a quadrilateral pavement brick body integrally cast from steel slag recycled concrete. The steel slag recycled concrete is composed of portland cement, recycled coarse aggregate, recycled fine aggregate and steel slag. A cross-crossing and interconnected water storage channel is arranged at the bottom of the pavement brick body. The water storage channel includes a transverse water storage channel and a longitudinal water storage channel. Both the transverse water storage channel and the longitudinal water storage channel penetrate through both side surfaces of the pavement brick body, and both the transverse water storage channel and the longitudinal water storage channel are wavy. Designing a cross-crossing and wavy water storage channel at the bottom of the pavement brick not only saves materials, but also has strong permeability, and the void volume at the bottom can instantaneously reserve a large amount of rainwater.

Description

Technical Field:

[0001] The present invention relates to an environmentally friendly steel slag recycled concrete interconnected pavement brick and a preparation method thereof. Background Art:

[0002] With the acceleration of the urbanization process, the demand for building materials has increased significantly. Currently, problems such as natural resource shortages and the treatment of construction waste concrete are faced. Steel slag, as a waste generated during the steelmaking process, has a large discharge volume and is difficult to treat. Traditional pavement bricks are mainly made of cement, clay, and natural sand and gravel through a series of processes such as high temperature, high pressure, and sintering. They can be used for pavement paving in gardens, schools, squares, etc., and have functions such as wear resistance, frost resistance, sound insulation, and heat absorption. However, there are also some deficiencies, such as consuming a large amount of resources, complex processes, easy to break, poor water permeability, affecting the urban rainwater cycle and natural purification, etc.

[0003] Currently, the discharge volume of steel slag in China is large, and the comprehensive utilization rate of steel slag is extremely low, only reaching 10%. Random stacking causes waste of land resources. Due to the generation of microcracks during the crushing of waste concrete, the recycled coarse and fine aggregates also have porosity, weak bonding, and looseness. Coupled with the transition zone between the recycled aggregates, these factors lead to large variability in the mechanical properties of the recycled aggregates, restricting the engineering application of recycled concrete. Although the preparation process of high temperature and high pressure can improve the production efficiency to a certain extent, it has a great adverse impact on the environment. In addition, traditional pavement bricks have poor water permeability, hindering the natural rainwater cycle and damaging the urban water ecosystem. Finally, the existing pavement bricks have complex processes, poor durability, and are easily damaged and eroded, and are not suitable for long-term use. Summary of the Invention:

[0004] The present invention makes improvements in view of the above problems existing in the prior art. That is, the technical problem to be solved by the present invention is to provide an environmentally friendly steel slag recycled concrete interconnected pavement brick and a preparation method thereof.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: an environmentally friendly steel slag recycled concrete interconnected pavement brick, including a pavement brick body integrally cast from steel slag recycled concrete, and a water storage channel with a cross-shaped intersection is provided at the bottom of the pavement brick body.

[0006] Further, the water storage channel includes a transverse water storage channel and a longitudinal water storage channel, and both the transverse water storage channel and the longitudinal water storage channel penetrate through both side surfaces of the pavement brick body.

[0007] Further, both the transverse water storage channel and the longitudinal water storage channel are in a wavy shape.

[0008] Furthermore, the steel slag recycled concrete is composed of the following raw materials by weight: 342 parts of ordinary Portland cement, 695 parts of recycled fine aggregate, 695 parts of recycled coarse aggregate, 463 parts of steel slag, and 260 parts of water.

[0009] Furthermore, the recycled fine aggregate has a particle size not exceeding 5 mm, an apparent density of 2300 kg / m³, a water absorption rate of 15%, and a fineness modulus of 2.5.

[0010] Furthermore, the recycled coarse aggregate has a particle size of 5 - 20 mm, an apparent density of 2400 kg / m³, a water absorption rate of 5.3%, a crushing index of 10%, and an aggregate replacement rate of 100%.

[0011] Furthermore, the steel slag has a particle size range of 5 mm - 20 mm, an apparent density of 3450 kg / m³, a water absorption rate of 1.2%, and a crushing index of 6.9%.

[0012] Another technical solution adopted in the present invention is: a preparation method of an environmentally friendly steel slag recycled concrete interconnected pavement brick, comprising the following steps:

[0013] Step S1, obtaining steel slag and recycled aggregate: Select the same batch of waste concrete, conduct preliminary manual or mechanical crushing, then further crush it with a jaw crusher, then remove impurities, further sort, wash, and vibrate and screen, and mix according to the required particle size and quality to obtain recycled fine aggregate with a particle size not exceeding 5 mm and high-quality recycled coarse aggregate with a particle size of 5 - 20 mm; Select the same batch of waste steel slag, and after crushing and screening, intermix them to obtain high-quality fine steel slag with a particle size of 5 - 20 mm;

[0014] Step S2, mixing cement: Add the recycled coarse aggregate, recycled fine aggregate, and steel slag into a forced mixer in sequence, stir for 0.5 - 1 min to make the recycled coarse aggregate, recycled fine aggregate, and steel slag evenly distributed, then put the cement into the mixer and stir for 0.5 - 1 min;

[0015] Step S3, mixing steel slag recycled concrete: Add water into the forced mixer in multiple times, stir for 30 s each time to make the recycled coarse aggregate, recycled fine aggregate, and steel slag completely wrapped by mortar, and obtain steel slag recycled concrete;

[0016] Step S4, measure the workability of the steel slag recycled concrete. If it does not meet the requirements, correct the mix ratio, keep the water-cement ratio unchanged, and repeat steps S2 - S3;

[0017] Step S5, pouring: Pour the steel slag recycled concrete from above the preparation mold, then place the preparation mold on a vibrating table for sufficient vibration; After vibration is completed, place the preparation mold in a curing room for curing, remove the preparation mold after 12 h, and continue curing until 28 days to obtain the pavement brick.

[0018] Compared with the prior art, the present invention has the following effects: (1) The structural design is simple and reasonable. The bottom is in a wavy cross shape and is mutually penetrated, saving materials. At the same time, it has strong permeability, and the void volume at the bottom can instantaneously store a large amount of rainwater; (2) It is low-cost, resource-saving, easy to produce, completely replaces ordinary coarse and fine aggregates, and can be applied to various corners such as squares, communities, and parking lots. Description of the Drawings:

[0019] Figure 1 is the schematic diagram of the main view sectional structure of the embodiment of the present invention;

[0020] Figure 2 is the schematic diagram of the three-dimensional structure of the embodiment of the present invention Figure 1 ;

[0021] Figure 3 is the schematic diagram of the three-dimensional structure of the embodiment of the present invention Figure 2 ;

[0022] Figure 4 is the paving schematic diagram of the embodiment of the present invention;

[0023] Figure 5 is the schematic diagram of the main view sectional structure after paving in the embodiment of the present invention;

[0024] Figure 6 is the schematic diagram of the three-dimensional structure of the mold preparation in the embodiment of the present invention.

[0025] In the figure:

[0026] 1 - recycled coarse aggregate; 2 - steel slag; 3 - recycled fine aggregate; 4 - permeable joint; 5 - water storage channel; 6 - recycled material cushion layer; 7 - road brick body; 8 - transverse water storage channel; 9 - longitudinal water storage channel; 10 - steel mold; 11 - pouring cavity; 12 - transverse rib; 13 - longitudinal rib; 14 - buckle. Specific Embodiments:

[0027] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0029] Such asFigures 1 to 5 As shown in Figures 1 to 5 , an environmentally friendly steel slag recycled concrete interpenetrating pavement brick of the present invention includes a quadrilateral pavement brick body 7 integrally cast from steel slag recycled concrete. A cross-shaped and interpenetrating water storage channel 5 is provided at the bottom of the pavement brick body 7. The water storage channel 5 includes a transverse water storage channel 8 and a longitudinal water storage channel 9. Both the transverse water storage channel 8 and the longitudinal water storage channel 9 penetrate through both side surfaces of the pavement brick body 7, and both the transverse water storage channel 8 and the longitudinal water storage channel 9 are wavy. Designing a cross-shaped and wavy water storage channel at the bottom of the pavement brick not only saves materials but also has strong permeability, and the void volume at the bottom can instantaneously store a large amount of rainwater.

[0030] In this embodiment, the steel slag recycled concrete is composed of Portland cement, recycled coarse aggregate 1, recycled fine aggregate 3, and steel slag 2. Adding steel slag can enhance the compactness and wear resistance of the pavement brick matrix, and the recycled coarse and fine aggregates are used to support and fill the pavement brick matrix.

[0031] In this embodiment, the particle size of the recycled fine aggregate does not exceed 5 mm, the apparent density is 2300 kg / m³, the water absorption rate is 15%, and the fineness modulus is 2.5, meeting the requirements of secondary grading.

[0032] In this embodiment, the particle size of the recycled coarse aggregate is 5 - 20 mm, the apparent density is 2400 kg / m³, the water absorption rate is 5.3%, the crushing index is 10%, and the aggregate replacement rate is 100%.

[0033] In this embodiment, the particle size range of the steel slag is 5 mm - 20 mm, the gradation is excellent, the apparent density is 3450 kg / m³, the water absorption rate is 1.2%, and the crushing index is 6.9%.

[0034] In this embodiment, Portland cement is used as the cementitious material of the pavement brick, and 42.5R ordinary Portland cement is selected, with a density of 3100 kg / m³.

[0035] In this embodiment, the pavement brick body is a regular quadrilateral, such as a rectangle or a square.

[0036] In this embodiment, the pavement brick is composed of the following raw materials in parts by weight: 342 parts of ordinary Portland cement, 695 parts of recycled fine aggregate, 695 parts of recycled coarse aggregate, 260 parts of water, and 463 parts of steel slag. The preparation process is as follows:

[0037] Step S1, Obtaining Steel Slag and Recycled Aggregates: Select the same batch of waste concrete, conduct preliminary manual or mechanical crushing, then further crush it using a jaw crusher. Next, remove impurities, further separate, wash, and vibrate and screen it, and mix it according to the required particle size and quality to obtain recycled fine aggregates with a particle size not exceeding 5 mm and high-quality recycled coarse aggregates with a particle size of 5 - 20 mm; Select the same batch of waste steel slag, and after crushing and screening, mix them to obtain high-quality fine steel slag with a particle size of 5 - 20 mm;

[0038] Step S2, Mixing Cement Evenly: Add the recycled coarse aggregates, recycled fine aggregates, and steel slag to a compulsory mixer in sequence, stir for 0.5 - 1 min to make the recycled coarse aggregates, recycled fine aggregates, and steel slag evenly distributed, then put the cement into the mixer and stir for 0.5 - 1 min;

[0039] Step S3, Mixing Steel Slag Recycled Concrete: Add water to the compulsory mixer in multiple times, stir for 30 s each time, so that the recycled coarse aggregates, recycled fine aggregates, and steel slag are completely wrapped by mortar to obtain steel slag recycled concrete;

[0040] Step S4, Measuring the Workability of Steel Slag Recycled Concrete. If the requirements are not met, correct the mix ratio, keep the water-cement ratio unchanged, and repeat Steps S2 - S3;

[0041] Step S5, Pouring: Pour the steel slag recycled concrete from above the preparation mold, then place the preparation mold on a vibrating table for sufficient vibration; After vibration, put the preparation mold into a curing room for curing, remove the preparation mold after 12 h, and continue to cure until 28 days to obtain the finished pavement bricks as shown in Figure 2 、 3 shown.

[0042] In this embodiment, when paving the pavement bricks: First, lay a cushion layer 6 with recycled coarse aggregates and tamp it. Then, fill the gaps between the coarse aggregates with recycled fine aggregates. Next, lay the pavement bricks with recycled fine aggregate mortar, as shown in Figure 4 、 5 shown. Since there are cross-shaped wavy water storage channels at the bottom of the pavement bricks, as shown in Figure 2 、 3 shown, so the pavement bricks penetrate each other, and there is a large void volume, which can immediately collect a large amount of rainwater and quickly infiltrate into the ground.

[0043] As shown in Figure 6As shown in the figure, the preparation mold of the pavement brick is assembled by two symmetrical steel molds on the left and right. The two steel molds 10 are fixed by the left and right latches 14. The top surface of the mold is provided with a downward concave pouring cavity 11 for pouring out the pavement brick body 7. The bottom surface of the pouring cavity 11 is provided with a transverse rib 12 and a longitudinal rib 13 that cross each other in a cross shape. The cross sections of the transverse rib 12 and the longitudinal rib 13 are both wavy and are used to pour out the transverse water storage channel 8 and the longitudinal water storage channel 9 respectively. Before pouring, the inner wall of the pouring cavity is evenly brushed with lubricating oil. The mold is fixed by the left and right latches. During pouring, concrete is poured from above, and it is vibrated and formed by a vibrating table. After completion, it is placed in a standard curing room for curing. After 12 hours, the fixing latches are removed and the mold is removed, and the curing continues until 28 days.

[0044] The advantages of the present invention are as follows:

[0045] 1) Waste concrete is processed into recycled coarse and fine aggregates and used to make pavement bricks, which is low in cost, saves resources, and completely replaces ordinary coarse and fine aggregates;

[0046] 2) The bottom of the pavement brick is in a cross-shaped wave, which is interconnected, saving materials; at the same time, it has strong permeability, and the void volume at the bottom can instantaneously store a large amount of rainwater;

[0047] 3) The pavement brick can maintain a certain humidity, purify the air, and reduce dust;

[0048] 4) It has a wide range of applications and can be applied to various corners such as squares, communities, and parking lots;

[0049] 5) The pavement brick is a regular quadrilateral, the mold is simple, and large-scale prefabrication production can be carried out;

[0050] 6) Compared with traditional pavement bricks, its process is simple, has high strength, and has better mechanical properties and permeability.

[0051] If the present invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), or it can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integral structure (for example, manufactured by integral casting process) (except when it is obvious that the integral forming process cannot be adopted).

[0052] In addition, for the terms used to represent the positional relationship or shape in any of the technical solutions disclosed in the present invention above, unless otherwise stated, their meanings include states or shapes that are approximate, similar, or close to them.

[0053] Any component provided by the present invention can either be assembled by multiple separate components or be a single component manufactured by an integral forming process.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements on some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. An environmentally friendly steel slag recycled concrete interpenetrating pavement brick, characterized in that: It includes a road brick body integrally cast and molded with steel slag recycled concrete, and a water storage channel that runs through crosswise and longitudinally is provided at the bottom of the road brick body; The water storage channel includes a transverse water storage channel and a longitudinal water storage channel. Both the transverse water storage channel and the longitudinal water storage channel run through both side surfaces of the road brick body; both the transverse water storage channel and the longitudinal water storage channel are wavy; The steel slag recycled concrete is composed of the following raw materials in parts by weight: 342 parts of ordinary Portland cement, 695 parts of recycled fine aggregate, 695 parts of recycled coarse aggregate, 463 parts of steel slag, and 260 parts of water; The particle size of the recycled fine aggregate does not exceed 5 mm, the apparent density is 2300 kg / m³, the water absorption rate is 15%, and the fineness modulus is 2.5; The particle size of the recycled coarse aggregate is 5 - 20 mm, the apparent density is 2400 kg / m³, the water absorption rate is 5.3%, the crushing index is 10%, and the aggregate replacement rate is 100%; The particle size range of the steel slag is 5 mm - 20 mm, the apparent density is 3450 kg / m³, the water absorption rate is 1.2%, and the crushing index is 6.9%.

2. A preparation method of the environment-friendly steel slag recycled concrete interconnected pavement brick as described in claim 1, characterized in that: It includes the following steps: Step S1, obtaining steel slag and recycled aggregate: Select the same batch of waste concrete, conduct preliminary manual or mechanical crushing, then further crush it with a jaw crusher, then remove impurities, further sort, wash, and vibrate and screen, and mix according to the required particle size and quality to obtain recycled fine aggregate with a particle size not exceeding 5 mm and high-quality recycled coarse aggregate with a particle size of 5 - 20 mm; Select the same batch of waste steel slag, and after crushing and screening, intermix them to obtain high-quality fine steel slag with a particle size of 5 - 20 mm; Step S2, mixing the cement evenly: Add the recycled coarse aggregate, recycled fine aggregate, and steel slag into a forced mixer in sequence, stir for 0.5 - 1 min to make the recycled coarse aggregate, recycled fine aggregate, and steel slag evenly distributed, and then put the cement into the mixer and stir for 0.5 - 1 min; Step S3, mixing the steel slag recycled concrete: Add water into the forced mixer in multiple times, stir for 30 s each time, so that the recycled coarse aggregate, recycled fine aggregate, and steel slag are completely wrapped by the mortar to obtain steel slag recycled concrete; Step S4, measure the workability of the steel slag recycled concrete. If it does not meet the requirements, correct the mix ratio, keep the water-cement ratio unchanged, and repeat steps S2 - S3; Step S5, pouring: Pour the steel slag recycled concrete from above the preparation mold, and then place the preparation mold on a vibrating table for sufficient vibration; After vibration is completed, put the preparation mold into a curing room for curing, remove the preparation mold after 12 h, and continue curing until 28 days to obtain the road brick.

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