Interlayer bonding structure of pavement structure layer with steel slag replacing natural stone and preparation method thereof

Abstract

The application discloses a road surface structure layer inter-adhesion structure of steel slag replacing natural stone and a preparation method thereof, wherein the road surface structure layer inter-adhesion structure of steel slag replacing natural stone comprises an adhesion layer and a steel slag layer located on the upper portion of the adhesion layer, the steel slag layer comprises a plurality of adjustable graded steel slags, and the surface of the steel slag is pre-mixed and wrapped with a sealing material layer for sealing external gaps of the steel slag. The road surface structure layer inter-adhesion structure of steel slag replacing natural stone provided by the application can not only achieve the same structural performance as traditional gravel as aggregate by laying the steel slag pre-mixed and wrapped with the sealing material layer on the adhesion layer, but also solve the harm caused by the expansion of the steel slag in water, and has the characteristics of long service life, convenient construction, environmental protection and good economy.

Description

Technical Field

[0001] This invention relates to the field of municipal roads, and in particular to an interlayer bonding structure for road surfaces using steel slag as a substitute for natural stone, and its preparation method. Background Technology

[0002] In the construction of municipal roads and highways, asphalt is generally used as a bonding material and crushed stone aggregate. A layered paving method is adopted, and by changing the ratio of bonding material and aggregate, a layered structure is formed. This structure is usually spread between the layers of the pavement structure to enhance the bonding effect between the layers and prevent diseases such as swelling caused by slippage between the structural layers.

[0003] Steel slag is the molten slag discharged during the steelmaking process, and it is the main and largest solid by-product of the metallurgical industry. The chemical composition of steel slag is mainly tricalcium silicate and dicalcium silicate, with a relatively stable chemical structure. Waste steel slag, primarily composed of tricalcium silicate and dicalcium silicate, exhibits good chemical compatibility with binders such as asphalt and polymer materials, making it a viable aggregate. Furthermore, with limitations such as the mining of natural aggregates, the availability and cost of usable natural aggregates are decreasing, while waste steel slag is widely available and its economic cost is only 40-50% of that of ordinary aggregates, making it highly economical.

[0004] Therefore, how to effectively improve the service life of the interlayer bonding structure of pavement using steel slag instead of natural stone and improve its economic efficiency is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a pavement structure interlayer bonding structure using steel slag as a substitute for natural stone and its preparation method, which can improve service life and solve the problem of later expansion due to water action caused by the large pores on the surface of steel slag.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A pavement structure with steel slag as a substitute for natural stone includes an interlayer bonding structure, comprising a bonding layer and a steel slag layer on top of the bonding layer, wherein the steel slag layer comprises adjustable graded steel slag, and the surface of the steel slag is pre-mixed and coated with a sealing material layer for sealing the external voids of the steel slag.

[0008] Preferably, the premixed asphalt coated on the steel slag accounts for 0.3-0.6% of the mass of the steel slag.

[0009] Preferably, the steel slag is steel slag with a target gradation range between 4.75mm-9.5mm or 9.5mm-13.2mm; and the steel slag is steel slag with a crushing value of not more than 28%.

[0010] Preferably, the adhesive layer is applied at a concentration between 1.4 and 2.5 kg / m³. 2 The adhesive layer.

[0011] Preferably, the steel slag layer has a spreading amount between 5 and 6 m. 3 / 1000m 2 The steel slag layer.

[0012] A method for preparing an interlayer bonding structure for pavement using steel slag as a substitute for natural stone includes the following steps:

[0013] Step S1: Obtain the target graded steel slag and sealing material;

[0014] Step S2: Heat the steel slag and the sealing material;

[0015] Step S3: The heated and prepared sealing material and the steel slag are placed into a mixing device for stirring. The amount of sealing material added is 0.3 to 0.6% of the mass of the steel slag. The mixing is completed when the sealing material is evenly coated on the surface of the steel slag.

[0016] Step S4: Lay the adhesive layer;

[0017] Step S5: Sprinkle steel slag coated with sealing material onto the surface of the adhesive layer;

[0018] Step S6: After the adhesive layer and the steel slag with the coating and sealing material are spread, the material is compacted using a compaction device. The compaction is completed when the steel slag with the coating and sealing material is completely embedded in the adhesive layer.

[0019] Preferably, in step S1, the crushing value of the steel slag is not greater than 28%, and the particle size is 4.75mm-9.5mm or 9.5mm-13.2mm.

[0020] Preferably, the sealing material is asphalt, and in step S2, the heating temperature of the asphalt is 160℃±5℃; the heating temperature of the steel slag is 105℃±5℃.

[0021] Preferably, step S4 specifically comprises:

[0022] Evenly spread adhesive material on the top surface of the main layer, with an application rate of 1.4–2.5 kg / m². 2 This forms an adhesive layer.

[0023] Preferably, step S5 specifically comprises:

[0024] After the bonding layer is applied, premixed steel slag coated with sealing material is applied, with a spreading amount of 5-6 m³. 3 / 1000m 2The area covered by the steel slag is 80±5% of the bonding layer; wherein the steel slag coated with the sealing material can be spread synchronously with the bonding material or asynchronously with the bonding material.

[0025] The interlayer bonding structure for road structures using steel slag as a substitute for natural stone provided by this invention includes a bonding layer and a steel slag layer located on top of the bonding layer. The steel slag layer comprises adjustable-graded steel slag, and the surface of the steel slag is pre-mixed and coated with a sealing material layer for sealing the external voids of the steel slag. This interlayer bonding structure for road structures using steel slag as a substitute for natural stone, by laying steel slag pre-mixed and coated with a sealing material layer on the bonding layer, not only achieves the same structural performance as traditional crushed stone as aggregate, but also solves the problems caused by the expansion of steel slag when exposed to water. Furthermore, it features a long service life, convenient construction, environmental friendliness, and good economic efficiency.

[0026] The present invention provides a method for preparing an interlayer bonding structure for road surfaces using steel slag as a substitute for natural stone, comprising the following steps: Step S1: Obtaining target-graded steel slag and a sealing material; Step S2: Heating the steel slag and the sealing material; Step S3: Placing the heated sealing material and the steel slag into a mixing device for stirring, wherein the amount of the sealing material added is 0.3-0.6% of the mass of the steel slag, and stirring is completed after the sealing material is uniformly coated onto the surface of the steel slag; Step S4: Laying a bonding layer; Step S5: Spreading steel slag coated with the sealing material onto the surface of the bonding layer; Step S6: After the bonding layer and the steel slag coated with the sealing material are spread, compacting the material using a compaction device, and compaction is completed when the steel slag coated with the sealing material is completely embedded into the bonding layer. The preparation method provided by this invention requires the steel slag to be pre-mixed before spreading. The pre-mixing requires the addition of a sealing material, such as asphalt, so that the surface of the steel slag is pre-coated with the sealing material. This not only achieves the same structural performance as traditional crushed stone as aggregate, but also solves the problem of the hazards caused by the expansion of steel slag when it comes into contact with water. It also has the characteristics of long service life, convenient construction, environmental protection and good economy. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A flowchart illustrating the method for preparing the interlayer bonding structure of a pavement structure using steel slag as a substitute for natural stone, as provided by the present invention.

[0029] Figure 2This is a partial structural schematic diagram of a specific embodiment of the interlayer bonding structure for road surface using steel slag as a substitute for natural stone provided by the present invention.

[0030] Wherein: 1-steel slag, 2-bonding layer. Detailed Implementation

[0031] The core of this invention is to provide a pavement structure interlayer bonding structure using steel slag to replace natural stone and its preparation method, which makes the pavement structure using steel slag to replace natural stone have the characteristics of long service life, convenient construction, environmental protection and good economy.

[0032] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Please refer to Figure 1 and Figure 2 , Figure 1 A flowchart illustrating the method for preparing the interlayer bonding structure of a pavement structure using steel slag as a substitute for natural stone, as provided by the present invention. Figure 2 This is a partial structural schematic diagram of a specific embodiment of the interlayer bonding structure for road surface using steel slag as a substitute for natural stone provided by the present invention.

[0034] In this embodiment, the interlayer bonding structure of the pavement structure in which steel slag replaces natural stone includes a bonding layer 2 and a steel slag layer 1.

[0035] The structural layer composed of bonding layer 2 and steel slag layer 1 can be used in road structures as a wear layer for vehicular traffic, a waterproof sealing layer, and a stress-absorbing layer for transition between rigid and flexible structures.

[0036] Furthermore, the steel slag layer 1 is located on top of the bonding layer 2. The steel slag layer 1 includes several adjustable graded steel slags. The surface of the steel slag is pre-mixed and coated with a sealing material layer for sealing the external voids of the steel slag. The sealing material layer is preferably asphalt, that is, the steel slag layer 1 is coated with asphalt in advance before being laid on the bonding layer 2.

[0037] The interlayer bonding structure of the pavement structure that replaces natural stone with steel slag provided by the present invention lays steel slag with asphalt premixed on the surface on the bonding layer 2. It can not only achieve the same structural performance as traditional crushed stone as aggregate, but also solve the problem of the hazards caused by the expansion of steel slag when it comes into contact with water. It also has the characteristics of long service life, convenient construction, environmental protection and good economy.

[0038] Based on the above embodiments, the premixed asphalt coated on the steel slag accounts for 0.3-0.6% of the mass of the steel slag.

[0039] Based on the above embodiments, the steel slag is steel slag with a target gradation range between 4.75mm-9.5mm or 9.5mm-13.2mm.

[0040] Based on the above embodiments, the steel slag is steel slag with a crushing value of no more than 28%.

[0041] Based on the above embodiments, the adhesive layer 2 is an adhesive layer made of a mixture of asphalt and polymer.

[0042] Based on the above embodiments, the amount of adhesive layer 2 is between 1.4 and 2.5 kg / m². 2 The adhesive layer.

[0043] Based on the above embodiments, the steel slag layer 1 is spread at a rate of 5-6m. 3 / 1000m 2 The steel slag layer.

[0044] The steel slag pavement provided in this embodiment uses a layered structure of asphalt and waste steel slag, and a new layered paving process that replaces traditional crushed stone aggregate with waste steel slag. At the same time, it proposes a construction process of pre-coating steel slag with asphalt, so as to solve the problem of later expansion caused by water due to the large pores on the surface of steel slag. It has the characteristics of long service life, convenient construction, environmental protection and good economy.

[0045] In addition to the above-mentioned interlayer bonding structure for pavement using steel slag instead of natural stone, this invention also provides a method for preparing an interlayer bonding structure for pavement using steel slag instead of natural stone.

[0046] The method for preparing the interlayer bonding structure of the pavement using steel slag as a substitute for natural stone includes the following steps:

[0047] Step S1: Obtain the target graded steel slag and sealing material;

[0048] Step S2: Heat the steel slag and sealing material;

[0049] Step S3: Place the heated and prepared sealing material and steel slag into a mixing device and stir. The amount of sealing material added is 0.3 to 0.6% of the mass of steel slag. Stirring is completed when the sealing material is evenly coated on the surface of the steel slag.

[0050] Step S4: Lay the adhesive layer 2;

[0051] Step S5: Sprinkle steel slag coated with sealing material onto the surface of adhesive layer 2;

[0052] Step S6: After the bonding layer 2 and the steel slag with the sealing material are spread, the material is compacted using a compaction device. The compaction is completed when the steel slag with the sealing material is completely embedded in the bonding layer 2.

[0053] The preparation method provided by this invention requires the steel slag to be pre-mixed before spreading. The pre-mixing requires the addition of asphalt, so that the surface of the steel slag is pre-coated with asphalt. This not only achieves the same structural performance as traditional crushed stone as aggregate, but also solves the problem of the damage caused by the expansion of steel slag when it comes into contact with water. It also has the characteristics of long service life, convenient construction, environmental protection and good economy.

[0054] Furthermore, in step S1, the crushing value of the steel slag is no greater than 28%, and the particle size is 4.75mm-9.5mm or 9.5mm-13.2mm.

[0055] Based on the above embodiments, the sealing material is preferably asphalt. In step S2, the heating temperature of the asphalt is 160℃±5℃, and the heating temperature of the steel slag is 105℃±5℃. By heating the asphalt and steel slag, better coating can be achieved, and the adhesion between the asphalt and the steel slag can be improved.

[0056] Based on the above embodiments, step S4 specifically includes:

[0057] Evenly spread adhesive material on the top surface of the main layer, with an application rate of 1.4–2.5 kg / m². 2 , forming adhesive layer 2.

[0058] Based on the above embodiments, step S5 specifically includes:

[0059] After the bonding layer 2 is applied, premixed steel slag coated with sealing material is applied, with a spreading amount of 5-6 m³. 3 / 1000m 2 The area of ​​steel slag spread accounts for 80±5% of the bonding layer 2; among which, the steel slag coated with sealing material can be spread synchronously with the bonding material or asynchronously with the bonding material, that is, the bonding layer 2 is spread first, and then the steel slag coated with sealing material is spread.

[0060] The foregoing has provided a detailed description of the interlayer bonding structure for road surfaces using steel slag as a substitute for natural stone, and its preparation method. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of these examples are merely for the purpose of helping to understand the preparation method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this invention.

Claims

1. A method for preparing an interlayer bonding structure for pavement using steel slag as a substitute for natural stone, characterized in that, The interlayer bonding structure of the pavement structure that replaces natural stone with steel slag includes a bonding layer (2) and a steel slag layer (1) located on the bonding layer (2). The steel slag layer (1) includes adjustable graded steel slag, and the surface of the steel slag is pre-mixed and coated with a sealing material layer for sealing the external voids of the steel slag. The sealing material layer is asphalt, and the pre-mixed asphalt coated on the steel slag accounts for 0.3-0.6% of the mass of the steel slag; the bonding layer (2) has a dosage between 1.4 and 2.5 kg / m³. 2 The bonding layer; the steel slag layer (1) is spread at a rate of 5-6 m³. 3 / 1000m 2 The steel slag layer; the steel slag is steel slag with a target gradation range between 4.75mm-9.5mm or 9.5mm-13.2mm, and the steel slag is steel slag with a crushing value of not more than 28%; Includes the following steps: Step S1: Obtain the target graded steel slag and sealing material; Step S2: Heat the steel slag and the sealing material; the heating temperature of the asphalt is 160℃±5℃; the heating temperature of the steel slag is 105℃±5℃; Step S3: The heated and prepared sealing material and the steel slag are placed into a mixing device for stirring. The amount of sealing material added is 0.3~0.6% of the mass of the steel slag. The mixing is completed when the sealing material is evenly coated on the surface of the steel slag. Step S4: Lay the adhesive layer (2); Step S5: Spread steel slag coated with sealing material on the surface of the adhesive layer (2); Step S6: After the adhesive layer (2) and the steel slag with the coating and sealing material are spread, the material is compacted using a compaction device. The compaction ends when the steel slag with the coating and sealing material is completely embedded in the adhesive layer (2). Step S4 specifically involves: Evenly spread adhesive material on the top surface of the main layer, with an application rate of 1.4–2.5 kg / m². 2 , forming an adhesive layer (2); Step S5 specifically involves: After the bonding layer (2) is spread, premixed steel slag coated with sealing material is spread. The amount of premixed steel slag spread is 5-6m. 3 / 1000m 2 The area of ​​steel slag spread accounts for 80±5% of the bonding layer (2); wherein, the steel slag coated with sealing material can be spread synchronously with the bonding material or asynchronously with the bonding material.

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