Road building material prepared from industrial solid waste, pavement structure and preparation method

Abstract

The invention relates to the technical field of road engineering, and provides a road building material prepared from industrial solid waste, a pavement structure and a preparation method, the industrial solid waste used in the road building material comprises the following components in parts by weight: 36-45 parts of gold tailings, 30-35 parts of desulfurized manganese slag, 10-15 parts of coal ash powder, 10-15 parts of silica fume, 10-15 parts of an active activator and 10-15 parts of an ion stabilizer. The invention relates to a high-strength concrete, which is prepared from the following components in parts by weight: 14 to 25 parts of coal ash powder, 6 to 9 parts of silica fume, 0.5 to 1.5 parts of active excitant and 0.3 to 0.8 part of The road building material provided by the invention has excellent road performance and water stability, realizes reutilization of part of industrial solid wastes, reduces exploitation of environmental resources, protects the ecological environment of a region, and solves the problems of shortage of soil and stone resources or serious damage to the ecological environment in the existing ecology.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of road engineering, in particular to a road building material prepared from industrial solid waste, a pavement structure and a preparation method. BACKGROUND

[0002] In the field of road engineering, a highway generally comprises a surface layer, a base layer and a subbase layer, and soil and stone building materials need to be arranged to increase the rigidity or resistance of the pavement, for example, soil and stone building materials mixed with asphalt are used to prepare building material raw materials with certain viscosity in the surface layer, and the building material raw materials are laid on the base layer and then flattened by corresponding engineering vehicles. However, with the acceleration of industrialization and the demand for construction development or highway maintenance, the demand for soil and stone building materials for highway building materials increases, and the demand for natural soil and stone resources increases, which leads to overexploitation of soil and stone resources and serious damage to the ecology in the region. Therefore, a material that can be used as a highway soil and stone building material is urgently needed to protect the ecological environment. SUMMARY

[0003] The embodiment of the application provides a road building material prepared from industrial solid waste, a pavement structure and a preparation method, which can replace soil and stone building materials used for highway construction, so as to realize the recycling of part of the industrial solid waste, reduce the exploitation of environmental resources, protect the ecological environment, and solve the problems of shortage of soil and stone resources or serious damage to the ecological environment in the existing ecology.

[0004] In a first aspect, the application discloses a road building material prepared from industrial solid waste, wherein the industrial solid waste comprises gold tailings, desulfurized manganese slag, coal ash powder, microsilica powder, an active activator and an ionic stabilizer, and the weight components of the corresponding components are as follows: 36-45 parts of gold tailings, 30-35 parts of desulfurized manganese slag, 14-25 parts of coal ash powder, 6-9 parts of microsilica powder, 0.5-1.5 parts of the active activator and 0.3-0.8 parts of the ionic stabilizer.

[0005] In the application, the gold tailings, the desulfurized manganese slag, the coal ash powder, the microsilica powder, the active activator and the ionic stabilizer are mixed according to a preset weight ratio to prepare a material that can be used as a road building material. The road building material has excellent road performance, physical and chemical properties and environmental protection performance, realizes recycling of solid waste, reduces pollution of the solid waste to the environment, reduces use of traditional soil and stone materials, and protects the ecological environment of the region.

[0006] Optionally, the industrial solid waste used comprises the following weight components: 36-44 parts of gold tailings, 30-34 parts of desulfurized manganese slag, 14-23 parts of coal ash powder, 6-9 parts of microsilica powder, 0.5-1.5 parts of the active activator and 0.5-0.7 parts of the ionic stabilizer.

[0007] In the design, the above weight ratio is used as an optimal scheme, and the advantages of road usability and water stability are more prominent.

[0008] Optionally, the active activator is sodium fluorosilicate, sodium silicate or a powder mixture of sodium fluorosilicate and sodium silicate, wherein the mass percentage of sodium fluorosilicate in the powder mixture is 8-16%.

[0009] In the design, sodium fluorosilicate or sodium silicate is used alone as an active activator, or a mixture of the two is used as an active activator, and the active activator can activate a large amount of silicon oxide, aluminum oxide and calcium monoxide in the desulfurized manganese slag and coal ash powder in an alkaline environment, promote the mutual adsorption and connection of trivalent iron ions, aluminum ions, silicon ions and ionic groups in the silica colloid, and help to improve the overall density and strength.

[0010] Optionally, in the powder mixture of sodium fluorosilicate and sodium silicate, the mass percentage of sodium fluorosilicate in the powder mixture is 10-16%.

[0011] In the design, when the powder mixture of sodium fluorosilicate and sodium silicate is used as an active activator, the mass percentage of sodium fluorosilicate in the mixture is 10-16%, which is more helpful to improve the overall density and strength.

[0012] Optionally, the ionic stabilizer is hydroxyethylidene diphosphonic acid, and the purity of the hydroxyethylidene diphosphonic acid is greater than 99%.

[0013] In the design, the high-purity hydroxyethylidene diphosphonic acid mainly reduces the water content in the processing process and improves the concentration of hydroxyl groups.

[0014] Optionally, the powder fineness of the ionic stabilizer is less than 0.2 mm.

[0015] In the design, the finer the powder of the ionic stabilizer, the more convenient it is to mix with other particulate components, and at the same time, it can promote the ionic stabilizer to fill the voids in the manganese sulfate slag and improve the mixing effect.

[0016] In a second aspect, the application discloses a road surface structure, which comprises an asphalt layer, a solid waste layer, a soil base layer and a solid waste mixed layer, wherein the asphalt layer is arranged on the top of the solid waste layer, the solid waste layer is arranged on the top of the soil base layer, and the soil base layer is arranged on the top of the solid waste mixed layer; the solid waste layer and the solid waste mixed layer comprise the road building material prepared from the industrial solid waste according to any one of the preceding description.

[0017] In a third aspect, the application discloses a preparation method of the road building material prepared from the industrial solid waste, which is used for preparing the road building material prepared from the industrial solid waste according to any one of the preceding description, and comprises the following steps: S1, the gold tailings, desulfurized manganese slag and coal ash powder are respectively placed in a drying treatment at 105±5 ℃; S2, crushing the gold tailings, desulfurization manganese slag and coal ash powder respectively by a crusher to obtain different main raw materials, and screening out lumps with a particle diameter greater than 2 mm from the main raw materials; S3, adding microsilica powder, active activator and ion stabilizer into a vertical dry powder stirrer in proportion to stir to obtain a primary dispersed raw material; S4, fully mixing the different main raw materials and the primary dispersed raw material according to a preset weight ratio to obtain a secondary dispersed raw material; S5, adding water to the secondary dispersed raw material and fully stirring to obtain a colloid; S6, compacting the colloid and curing for 72 h in an environment with a relative humidity of ≥ 90%.

[0018] As described above, the preparation method for preparing the road building material from industrial solid waste provided by the application can improve the road performance, physical and chemical properties and environmental protection performance of the road building material.

[0019] The vertical dry powder stirrer has a rotating speed r = 330 r / min and a stirring time t = 120 s. In the foregoing S5, water is added according to the optimal water content, and the optimal water content is obtained according to the heavy hammer test method through multiple tests.

[0020] In some embodiments, the coal ash powder contains at least silicon oxide or aluminum oxide as a glass body active component.

[0021] The application has the following beneficial effects: The road building material prepared by the preparation method provided by the application has superior road performance, water stability and environmental protection performance, realizes the reuse of part of the industrial solid waste, reduces the exploitation of environmental resources, protects the ecological environment of the region, and solves the problem of shortage of soil and stone resources or serious damage to the ecological environment in the existing ecology.

[0022] Similarly, the disclosed road surface structure has the effects of superior water stability, compression resistance and shear resistance. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Fig. 1 shows a preparation flowchart of a road building material prepared from industrial solid waste provided by the application; Figure 2 Fig. 2 shows a hierarchical structure diagram of a road surface structure provided by the application; Figure 3 Table 1 is as follows: Figure 4 Table 2 is as follows: Figure 5 Table 3 is as follows.

[0024] In the figure: 1: asphalt layer; 2: solid waste layer; 3: soil base layer; 4: solid waste mixed layer. DETAILED DESCRIPTION

[0025] The technical solutions in the application examples will be clearly and completely described below in combination with the drawings in the application examples. In addition, "in an embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0026] In the field of road engineering, a highway generally includes a surface layer, a base layer and a subbase layer. In order to increase the stiffness or resistance of the road surface, earth and stone building materials need to be set, such as using asphalt mixed earth and stone building materials to make building material raw materials with certain viscosity in the surface layer, which are laid on the base layer and then flattened by corresponding engineering vehicles. However, with the acceleration of industrialization and the demand for construction development or highway maintenance, the demand for earth and stone building materials for highway building materials has increased, and the demand for natural earth and stone resources has also increased, resulting in overexploitation of earth and stone resources and serious damage to the ecology in the region. Therefore, a material that can be used as a highway earth and stone building material is urgently needed to protect the ecological environment.

[0027] The application provides a kind of industrial solid waste preparation road building material, road surface structure and preparation method, which will be described in detail below in combination with specific examples and experimental data.

[0028] In a first aspect, the application discloses a kind of industrial solid waste preparation road building material, the industrial solid waste used includes gold tailings, desulfurization manganese slag, coal ash powder, microsilica and active activator and ion stabilizer, the weight component of corresponding component is as follows: gold tailings 36-45 parts, desulfurization manganese slag 30-35 parts, coal ash powder 14-25 parts, microsilica 6-9 parts, active activator 0.5-1.5 parts, ion stabilizer 0.3-0.8 parts.

[0029] As described above, the application discloses a new type of industrial solid waste environmental protection type road building material, which uses industrial solid wastes such as gold tailings, desulfurization manganese slag, coal ash powder and microsilica as main raw materials, adds trace amounts of active activator and ion stabilizer, and prepares an environmental protection type road building material through the comprehensive action of physics and chemistry. The environmental protection type road building material prepared by the application has the advantages of low cost, good road performance, high water stability, environmental protection, etc., and can be used in the fields of foundation replacement, roadbed and subbase filling, construction access and other engineering fields of various grades of roads. The application not only saves a large amount of earth and stone resources consumed by traditional road construction, but also fully utilizes various industrial solid wastes, and has the advantages of green environmental protection and resource recycling.

[0030] In the present application, because the particle shape and particle size of the gold tailings and the desulfurized manganese slag in the raw materials cooperate with each other, the shear resistance of the road building material is enhanced. The active components of silicon oxide and / or aluminum oxide in the fly ash powder undergo hydration reaction in the weak alkaline liquid environment of the desulfurized manganese slag, and are excited to react with the desulfurized manganese slag to form a stable cementitious structure. In addition, the micro-silicon powder is in an amorphous spherical shape, which can effectively fill the pores and further combine with the cementitious body, thereby improving the water resistance. The stabilizer chelates with the high-valence metal ions precipitated to form stable chromium compounds, thereby inhibiting the leaching of metal ions such as manganese ions, copper ions, and chromium ions, and achieving the effect of environmental protection.

[0031] In addition, the active activator can effectively activate a large amount of silicon oxide, aluminum oxide, and calcium oxide components in the desulfurized manganese slag and the fly ash powder under alkaline conditions, promote the mutual adsorption and connection of silicon ions, aluminum ions, and other ions and ion groups, and significantly improve the overall density and strength of the road building material.

[0032] It should be noted that the aforementioned ion stabilizer is hydroxyethylidene diphosphonic acid, and the purity of the hydroxyethylidene diphosphonic acid is greater than 99%; the powder fineness of the ion stabilizer is less than 0.2 mm.

[0033] In the present application, the high-purity hydroxyethylidene diphosphonic acid mainly reduces the water content in the processing process and improves the concentration of hydroxyl groups. In addition, the finer the powder of the ion stabilizer, the more convenient it is to mix with other particle components, and at the same time, it can promote the ion stabilizer to fill the voids in the manganese sulfate slag and improve the bonding force inside the mixture.

[0034] In some embodiments, the aforementioned active activator is sodium fluorosilicate, sodium silicate, or a powder mixture of sodium fluorosilicate and sodium silicate, wherein the mass percentage of sodium fluorosilicate in the powder mixture is 8-16%. It should be noted that when sodium silicate or a powder mixture of sodium fluorosilicate and sodium silicate is used as the active activator, the mass percentage of sodium fluorosilicate in the powder mixture is preferably 10-16%.

[0035] In the present embodiment, sodium fluorosilicate or sodium silicate can be used alone as the active activator, or a mixture of the two can be used as the active activator. The active activator can activate a large amount of silicon oxide, aluminum oxide, and calcium monoxide in the desulfurized manganese slag and the fly ash powder under alkaline conditions, promote the mutual adsorption and connection of trivalent iron ions, aluminum ions, silicon ions, and other ions and groups in the cementitious body, and help to improve the overall density and strength.

[0036] In a second aspect, with reference to Figure 2The present invention also discloses a pavement structure, including an asphalt layer, a solid waste layer, a soil base layer, and a solid waste mixed layer. The asphalt layer is arranged on the top of the solid waste layer, the solid waste layer is arranged on the top of the soil base layer, and the soil base layer is arranged on the top of the solid waste mixed layer; the solid waste layer and the solid waste mixed layer include road building materials made from any of the aforementioned industrial solid wastes.

[0037] In the present invention, the aforementioned road construction materials are used to design a pavement structure including an asphalt layer, a solid waste layer, a soil base layer, and a solid waste mixed layer. In this structure, because the solid waste layer and the solid waste mixed layer include the aforementioned road construction materials, the pressure resistance, shear resistance, and water resistance or water stability of the corresponding layers of the pavement are improved, thereby improving the stability and practicality of the pavement.

[0038] Specifically, the aforementioned asphalt layer represents the surface layer of the existing asphalt road surface, and the soil base layer represents the foundational soil structure layer. Furthermore, the solid waste mixed layer includes not only the aforementioned road construction materials but also selected rocks from dismantled old roads. In actual construction, the thickness of each layer must be considered and adaptively adjusted based on the performance parameters of the road construction materials and the parameters of other layers. This is not a specific limitation of the present invention.

[0039] In actual paving, in addition to each layer being compacted separately, adjacent layers also require compaction by rollers of different weights to ensure the connection stability between adjacent layers and avoid local structural instability and settlement of the road surface.

[0040] Thirdly, as Figure 1 As shown in the figure (the environmentally friendly road building material is the road building material prepared by the present invention), the present invention discloses a preparation method of the road building material from the aforementioned industrial solid waste, which comprises the following preparation steps: S1, drying the gold tailings, desulfurized manganese slag and fly ash powder at 105±5℃ respectively; S2, using a crusher to crush the gold tailings, desulfurization manganese slag and fly ash powder to obtain different main raw materials, and screening out agglomerates with a particle diameter greater than 2 mm; S3, adding microsilica powder, active stimulant and ion stabilizer in proportion to a vertical dry powder mixer and stirring to obtain a primary dispersed raw material; S4, fully mixing the different main raw materials and the primary dispersion raw materials according to a preset weight ratio to obtain a secondary dispersion raw material; S5, adding water to the secondary dispersion raw material and stirring thoroughly to obtain a colloid; S6, compacting the colloid and curing it in an environment with a relative humidity of ≥90% for 72 hours.

[0041] The rotation speed r of the vertical dry powder mixer is 330 r / min, and the stirring time t is 120 s, which are obtained according to actual tests. In addition, water needs to be added according to the optimum water content in S5, and the optimum water content needs to be obtained through multiple heavy compaction tests according to the corresponding national standards, such as the Soil Test Method Standard or the Highway Soil Test Procedure. The specific measurement and specific value of the optimum water content are not specifically limited in the application, and need to be obtained according to the characteristics of the actual raw materials and by referring to the data test of the aforementioned national standards.

[0042] In addition, in the preparation method, the main raw materials, i.e., the pulverized materials after crushing of the gold tailings, desulfurized manganese slag and coal ash powder, are mixed with microsilica powder, active activator and ion stabilizer in a vertical dry powder mixer to obtain a first dispersed raw material according to a preset weight ratio. The weight ratio is according to the aforementioned weight component ratio, i.e., 36-45 parts of gold tailings, 30-35 parts of desulfurized manganese slag, 14-25 parts of coal ash powder, 6-9 parts of microsilica powder, 0.5-1.5 parts of active activator, and 0.3-0.8 parts of ion stabilizer; or according to 36-44 parts of gold tailings, 30-34 parts of desulfurized manganese slag, 14-23 parts of coal ash powder, 6-9 parts of microsilica powder, 0.5-1.5 parts of active activator, and 0.5-0.7 parts of ion stabilizer. The specific performance detection table 3 of the finished product can be referred to, and the parameter requirements of actual road construction can be adaptively selected within the range of the two aforementioned ratios.

[0043] The industrial solid waste road building material prepared by the preparation method has the following performance indicators and results after detection: pH value 7.0-9.0; cohesion > 160 kPa; internal friction angle > 38°; 7-day unconfined compressive strength > 2.0 MPa; uniaxial compression modulus > 1700 MPa; CBR > 60; the CBR value is the California bearing ratio, which is a core index for evaluating the bearing capacity of soil or pavement material in road engineering, and is used for roadbed design, material selection and construction quality control. The calculation result directly affects the stability and service life of the road structure.

[0044] softening coefficient > 0.80.

[0045] In the present application, the raw material components of the industrial solid waste used can be: 36-45 parts of gold tailings, 30-35 parts of desulfurized manganese slag, 14-25 parts of fly ash powder, 6-9 parts of microsilica powder, 0.5-1.5 parts of active activator, and 0.3-0.8 parts of ion stabilizer. It can also be: 36-44 parts of gold tailings, 30-34 parts of desulfurized manganese slag, 14-23 parts of fly ash powder, 6-9 parts of microsilica powder, 0.5-1.5 parts of active activator, and 0.5-0.7 parts of ion stabilizer. Therefore, in this embodiment, products are prepared with different component proportions, and performance tests are performed on the products.

[0046] As shown in Table 1 of the accompanying drawings, three groups of performance tests were performed according to the aforementioned component proportion ranges. Figure 3

[0047] In addition, in order to compare the performance of the road building material under different component proportions, seven groups of comparative examples were prepared based on the road building materials of batches A1, A2, and A3, and corresponding performance tests were performed. The specific test data are shown in Table 2 of the accompanying drawings. Figure 4

[0048] Based on the three groups of implementable component proportion schemes and the seven groups of comparative component proportion schemes, corresponding performance tests were performed on the products, including Ph value, cohesion, and uniaxial compression modulus. The specific test data are shown in Table 3 of the accompanying drawings. Figure 5

[0049] Among them, the internal friction angle reflects the shear strength of the road building material; the unconfined compressive strength reflects the compressive capacity of the road building material; the uniaxial compression modulus reflects the axial compression deformation capacity of the road building material; the softening coefficient reflects the water resistance or water stability of the road building material, and the larger the value, the stronger the strength retention ability of the material after immersion in water; the cohesion reflects the stability of the material structure; and the Ph value directly affects the durability, structural stability, and performance of the material. If the Ph is less than 7, the material is prone to aging, and if the Ph is greater than 7, the material is prone to internal expansion or corrosion.

[0050] As can be seen from the above table, the performance parameters of the products under different proportions differ greatly, among which the products of batches A1, A2, and A3 have the advantages of strong stability, strong compressive capacity, and strong water resistance. In actual application, the raw material proportions, additive amounts, and preparation process parameters need to be adjusted and optimized appropriately according to the requirements of road construction technical parameters, so as to achieve the best product performance and economic benefits.

[0051] It should be noted that the measurement methods of the aforementioned test data are the corresponding national industry standard test methods, which will not be described again in this embodiment.

[0052] ​​​In addition, the test data verify that the application has superior road performance such as strong compression resistance and strong stability, has good water stability or water resistance, and greatly reduces the cost of raw processing materials by using industrial solid waste, and has the advantages of green environmental protection and superior road performance.

[0053] Finally, all the above embodiments belong to the same inventive concept, and the description of each embodiment has its own emphasis. If the description is not exhaustive in an individual embodiment, it can be referred to the description in other embodiments. Each embodiment in the specification is described in a progressive manner, and each embodiment emphasizes the difference from other embodiments. The same or similar parts between each embodiment can be referred to each other.

[0054] The above embodiments only express the implementation of the application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the inventive concept, a number of modifications and improvements can be made, which are within the scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A road building material made from industrial solid waste, characterized in that: The industrial solid waste used includes gold tailings, desulfurization manganese slag, fly ash powder, microsilica powder, as well as active activator and ion stabilizer. The weight composition of the corresponding components is: 36~45 parts of gold tailings, 30~35 parts of desulfurization manganese slag, 14~25 parts of fly ash powder, 6~9 parts of microsilica powder, 0.5~1.5 parts of active activator, and 0.3~0.8 parts of ion stabilizer.

2. The road building material made from industrial solid waste according to claim 1, characterized in that: The weight components of the industrial solid waste used are: 36-44 parts of gold tailings, 30-34 parts of desulfurized manganese slag, 14-23 parts of fly ash powder, 6-9 parts of microsilica powder, 0.5-1.5 parts of active activator, and 0.5-0.7 parts of ion stabilizer.

3. The road building material made from industrial solid waste according to claim 1, characterized in that: The active stimulant is sodium fluorosilicate, sodium silicate or a powder mixture of sodium fluorosilicate and sodium silicate, wherein the mass percentage of sodium fluorosilicate in the powder mixture is 8-16%.

4. The road building material made from industrial solid waste according to claim 3, characterized in that: In the powder mixture of sodium fluorosilicate and sodium silicate, the mass percentage of sodium fluorosilicate in the powder mixture is 10-16%.

5. The road construction material made from industrial solid waste according to claim 1, characterized in that: The ionic stabilizer is hydroxyethylene diphosphonic acid, and the purity of hydroxyethylene diphosphonic acid is greater than 99%; the powder fineness of the ionic stabilizer is less than 0.2 mm.

6. A pavement structure, characterized in that: The invention comprises an asphalt layer (1), a solid waste layer (2), a soil base layer (3), and a solid waste mixed layer (4), wherein the asphalt layer (1) is arranged on the top of the solid waste layer (2), the solid waste layer (2) is arranged on the top of the soil base layer (3), and the soil base layer (3) is arranged on the top of the solid waste mixed layer (4); the solid waste layer (2) and the solid waste mixed layer (4) comprise road construction materials made from industrial solid waste according to any one of claims 1 to 5.

7. A method for preparing road building materials from industrial solid waste, characterized in that: For preparing the road building material made from industrial solid waste as claimed in any one of claims 1 to 5, comprising: S1, drying the gold tailings, desulfurized manganese slag and fly ash powder at 105±5℃ respectively; S2, using a crusher to crush the gold tailings, desulfurization manganese slag and fly ash powder to obtain different main raw materials, and screening out agglomerates with a particle diameter greater than 2 mm; S3, adding microsilica powder, active stimulant and ion stabilizer in proportion to a vertical dry powder mixer and stirring to obtain a primary dispersed raw material; S4, fully mixing the different main raw materials and the primary dispersion raw materials according to a preset weight ratio to obtain a secondary dispersion raw material; S5, adding water to the secondary dispersion raw material and stirring thoroughly to obtain a colloid; S6, compacting the colloid and curing it in an environment with a relative humidity of ≥90% for 72 hours.

8. The method for preparing road building materials from industrial solid waste according to claim 7, characterized in that: The rotation speed of the vertical dry powder mixer is r=330 r / min; the mixing time is t=120s.

9. The preparation method according to claim 7, characterized in that In the aforementioned S5, water is added according to the optimal water content, and the optimal water content is obtained by multiple tests according to the heavy impact test method.

10. The preparation method according to claim 7, characterized in that The fly ash powder contains at least silicon oxide or aluminum oxide as a glass active component.

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