Industrial building solid waste carbon-negative road structure and its information-automated carbon maintenance method

Abstract

The present invention discloses an industrial construction solid waste negative carbon road structure and an information-automated carbon maintenance method thereof, wherein the road structure comprises a durable surface layer laid from top to bottom, a negative carbon water-stabilized base layer, a CO2-cured gas-increasing layer, a negative carbon roadbed cushion layer and a roadbed, wherein the negative carbon roadbed cushion layer is fine-grained soil or construction solid waste fine aggregate stabilized by industrial solid waste-based negative carbon gel materials, the CO2-cured gas-increasing layer is negative carbon-reinforced construction solid waste graded coarse aggregate stabilized by industrial solid waste-based negative carbon gel materials, and the negative carbon water-stabilized base layer is negative carbon-reinforced construction solid waste graded coarse aggregate stabilized by cement. The strength of the industrial construction solid waste negative carbon road structure of the present invention is effectively improved, and the use of industrial solid waste-based negative carbon gel materials solves the shrinkage and cracking problems of traditional binders; the use of construction solid waste recycled aggregates reduces the dependence on natural sand and stone materials, and the information-automated carbon maintenance method of the present invention can intuitively and effectively monitor the road maintenance situation and make adjustments to achieve the expected effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of roadbed, and specifically relates to an industrial building solid waste negative carbon road structure and an information automated carbon maintenance method thereof. Background Art

[0002] Road construction provides safe, fast, economical and comfortable driving conditions for people's travel, so road construction is one of the important signs of urban modernization. In recent years, the national economy has developed rapidly, the urbanization process has been accelerating, and higher requirements have been put forward for the efficiency and quality of urban infrastructure. With the increase of road traffic pressure, the quality of urban road base and pavement structure is facing tests and challenges. For a long time, road engineering research has focused on "pavement and subgrade", resulting in many road diseases caused by subgrade, such as simple subgrade structure and low strength. How to improve the subgrade structure and improve the subgrade strength is of great significance to national construction and development. At the same time, with the rapid development of road infrastructure, the demand for raw materials mainly based on aggregates and binders (cement, asphalt, etc.) is increasing. Simply relying on natural sand and gravel cannot meet the demand, and traditional binders are prone to shrinkage and cracking, which brings many difficulties to engineering construction. How to solve the material problem has become a top priority. With the urban renewal construction and industrial development, a large amount of industrial construction solid waste has been generated. Relevant research has shown that some solid waste can be used in the engineering field after screening, recycling and regeneration.

[0003] Regarding the recycling of solid waste in roadbed construction, some researchers have also proposed corresponding methods, such as "A method for laying a recycled roadbed based on full utilization of solid waste (CN202110045682.8)", which uses asphalt solid waste recycled materials and natural gravel, cement, etc. as fillers to lay the roadbed, which can effectively improve the strength of the roadbed. However, in actual operation, new asphalt still needs to be added, the waste disposal is single, and carbon fixation cannot be achieved; "A highway coal gangue roadbed structure (CN202020767361.X)" uses coal gangue waste near the construction line for roadbed filling, and designs a coal gangue widening roadbed structure. This method alleviates the problem of filler shortage, but the treatment of solid waste is single and has no The method achieves carbon fixation effect; "A highway roadbed composite material and highway roadbed manufacturing method (CN201710550357.0)", the oil shale waste residue, fly ash and fill soil are air-dried, crushed, added with water and stirred thoroughly, compacted and formed on the flat roadbed load-bearing surface, and then allowed to stand to complete the production of the highway roadbed. The roadbed structure of this method is relatively simple and cannot achieve carbon fixation; "A roadbed structure based on polyurethane solidified waste mud material (CN202110248941.7)" uses polyurethane solidified waste mud material to cast and form a roadbed, upper embankment and lower embankment, which can improve the firmness of the roadbed and reduce the utilization of soil resources. However, this method treats a single solid waste and cannot achieve carbon fixation. Summary of the invention

[0004] Technical problems to be solved: In response to the above technical problems, the present invention provides an industrial building solid waste negative carbon road structure and an information-automated carbon maintenance method thereof, which can effectively solve the above-mentioned shortcomings such as reliance on natural sand and gravel materials, single solid waste treatment and inability to achieve carbon fixation.

[0005] Technical solution: In the first aspect, the present invention provides an industrial construction solid waste negative carbon road structure, including a durable surface layer laid from top to bottom, a negative carbon water-stabilized base layer, a CO2 curing and gasifying layer, a negative carbon roadbed cushion layer and a roadbed, the negative carbon roadbed cushion layer is fine-grained soil or construction solid waste fine aggregate stabilized by industrial solid waste-based negative carbon gel materials, the CO2 curing and gasifying layer is negative carbon reinforced construction solid waste graded coarse aggregate stabilized by industrial solid waste-based negative carbon gel materials, and the negative carbon water-stabilized base layer is negative carbon reinforced construction solid waste graded coarse aggregate stabilized by cement.

[0006] Preferably, the industrial solid waste-based negative carbon gel material is prepared by dry mixing industrial solid waste as a precursor, alkali metal oxide or a mixture of strong base and weak acid salts as an activator, according to a mass ratio of 65-75wt.% of precursor, 20-30wt.% of activator and 5-15wt.% of quicklime.

[0007] Preferably, the negative carbon reinforced construction solid waste graded coarse aggregate is a regenerated negative carbon reinforced aggregate formed by soaking the crushed construction solid waste coarse aggregate in ultrafine cement slurry or calcium hydroxide solution, then coating and granulating with industrial solid waste-based negative carbon gel material, and then pre-curing and CO2 curing. The water-cement mass ratio of the ultrafine cement slurry is 1.3-1.5:1, the calcium hydroxide solution is >0.01mol / L, and the mass ratio of water to the industrial solid waste-based negative carbon gel material during coating and granulation is 0.15-0.35:1.

[0008] Preferably, the particle size of the fine-grained soil in the negative carbon roadbed cushion layer is ≤2.75mm, the fine-grained soil is sandy soil with a plasticity index greater than 4 or clay or sub-clay with a plasticity index of 10-15, and the organic matter content in the soil is less than 10wt.%, and the moisture content is 16-22%; the dosage of the industrial solid waste-based negative carbon gel material in the negative carbon roadbed cushion layer is 12-15wt.% of the negative carbon roadbed cushion layer, the laying thickness of the negative carbon roadbed cushion layer is 120-150mm, and the compaction degree is ≥97%.

[0009] In the second aspect, the present invention provides an information-automated carbon maintenance method for industrial building solid waste negative carbon road structures. After the construction of the negative carbon water-stabilized base layer is completed, a relatively closed carbon maintenance environment is created for the road structure, and then humid CO2 gas is injected into the CO2 maintenance aeration layer. With the help of sensors installed on the surface of the negative carbon water-stabilized base layer, a controller of the CO2 maintenance aeration layer and an external intelligent monitoring cabinet, the carbon maintenance status is dynamically monitored to achieve the collection and recycling of overflow CO2 gas.

[0010] Preferably, the method for forming the relatively closed carbon maintenance environment is to lay a thickened PE film on the surface of the negative carbon water-stable base layer, and first cover 50-80 mm of clay on both sides of the road structure, then lay a degradable plastic film, and then cover it with a 120-150 mm clay layer, finally forming a relatively closed carbon maintenance environment.

[0011] Preferably, the sensor includes a temperature monitoring module, a humidity monitoring module, a pressure monitoring module and a CO2 concentration monitoring module to realize carbon maintenance status data collection; the controller includes a CO2 concentration control module, a CO2 pressure control module, a CO2 humidity control module and a CO2 recovery and compression module to ensure a constant maintenance environment; the intelligent monitoring cabinet dynamically collects and analyzes carbon maintenance status data through sensors, and then uses the controller to realize real-time adjustment of CO2 maintenance environment working parameters.

[0012] Furthermore, the temperature monitoring module is used to monitor whether the temperature of the carbon maintenance environment is between 20-40°C and upload data to the smart monitoring cabinet, the humidity monitoring module is used to monitor whether the humidity of the carbon maintenance environment is between 50%-75% and upload data to the smart monitoring cabinet, the pressure monitoring module is used to monitor whether the pressure of the carbon maintenance environment is between 0.1-0.3MPa and upload data to the smart monitoring cabinet, and the CO2 concentration monitoring module is used to monitor whether the CO2 volume concentration of the carbon maintenance environment is at the maintenance concentration of 17%-23% and upload data to the smart monitoring cabinet.

[0013] Beneficial effect: After the negative carbon treatment, the industrial building solid waste negative carbon road structure of the present invention has its strength effectively improved compared with the traditional road structure;

[0014] The present invention uses industrial solid waste-based negative carbon gel materials to effectively solve the shrinkage and cracking problems of traditional binders;

[0015] The present invention adopts a negative carbon method to strengthen the roadbed structure, responding to the goals of "carbon peak" and "carbon neutrality";

[0016] The present invention uses recycled aggregates from construction solid waste, which can reduce the dependence on natural sand and stone materials, and alleviate the current problems of limited mining of natural sand and stone and huge demand for materials;

[0017] The monitoring system used in the road construction and maintenance process of the present invention can intuitively and effectively monitor the road maintenance situation and make adjustments to achieve the expected effect;

[0018] The construction solid waste used in the present invention all comes from local factories or urban reconstruction and construction, and the transportation distance is short, which is conducive to reducing the pressure on the urban traffic environment and construction costs caused by the transportation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the process of the industrial building solid waste negative carbon road structure and the information automated carbon maintenance method thereof of the present invention;

[0020] Figure 2 It is a schematic diagram of the connection between the intelligent monitoring system and the road structure in the information automation carbon maintenance method of the present invention;

[0021] Serial numbers in the figure: 1. Temperature monitoring module, 2. Humidity monitoring module, 3. Pressure monitoring module, 4. CO2 concentration monitoring module, 5. CO2 concentration control module, 6. CO2 pressure control module, 7. CO2 humidity control module. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments: Example 1

[0023] like Figure 1 As shown, S1, laying negative carbon roadbed cushion: the negative carbon roadbed cushion uses industrial solid waste-based negative carbon gel material to stabilize fine-grained soil. The fine-grained soil is taken from the construction site, using clay with a plasticity index of 15, and the organic matter content in the soil is less than 10wt.%, and the moisture content is 16%. The water, fine-grained soil and industrial solid waste-based negative carbon gel material are evenly mixed and roughly spread on the roadbed. The cushion layer has a virtual thickness of 150mm and a compaction degree of ≥97%. It is first rolled 4 times with a vibratory roller, and then statically compacted 3 times with a three-wheel roller, and maintained for no less than 7 days;

[0024] S2. Prepare an industrial solid waste-based negative carbon gel material by dry mixing according to the mass ratio of 75wt.% of industrial solid waste, 20wt.% of activator magnesium oxide and 5wt.% of quicklime, then soak the crushed coarse aggregate of construction solid waste in ultrafine cement slurry (water-cement mass ratio of 1.5:1), and then encapsulate and granulate the crushed coarse aggregate of construction solid waste with the industrial solid waste-based negative carbon gel material to prepare negative carbon reinforced construction solid waste graded coarse aggregate. During the encapsulation and granulation, the mass ratio of water to the industrial solid waste-based negative carbon gel material is 0.15:1;

[0025] S3. Laying CO2 curing and aeration layer: The CO2 curing and aeration layer is a graded coarse aggregate of negative carbon reinforced construction solid waste stabilized by negative carbon gel material based on industrial solid waste. The maximum particle size of the coarse aggregate is not more than 40 mm, and it is composed according to the grading requirements of 31.5-40 mm accounting for 10 wt.%, 26.5-31.5 mm accounting for 15 wt.%, 19.5-26.5 mm accounting for 25 wt.%, 9.5-19.5 mm accounting for 25 wt.%, and 4.75-9.5 mm accounting for 25 wt.%. Among them, the dosage of industrial solid waste-based negative carbon gel material is 6 wt.% of the CO2 curing and aeration layer. The laying thickness of the CO2 curing and aeration layer is 150 mm, and the compaction degree is ≥ 97%;

[0026] S4. Laying of negative carbon water-stabilizing layer: The negative carbon water-stabilizing layer is cement-stabilized negative carbon reinforced construction solid waste graded coarse aggregate, the maximum particle size of the coarse aggregate is ≤21.5mm, and is composed according to the grading requirements of 19.5-21.5mm accounting for 15wt.%, 9.5-19.5mm accounting for 25wt.%, 4.7-9.5mm accounting for 24wt.%, 2.36-4.75mm accounting for 20wt.%, and 0.5-2.36mm accounting for 16wt.%. Among them, the amount of cement is 4wt.% of the negative carbon water-stabilizing base layer, the laying thickness of the negative carbon water-stabilizing layer is 170mm, and the compaction degree is ≥98%;

[0027] S5. Films are laid on both sides and the top of the road structure to prevent the subsequent leakage of CO2 filled during negative carbon maintenance. Thickened PE film is used on the top of the road structure, and degradable plastic film is used on both sides of the road structure. Before laying the films on both sides of the road structure, clay is laid between the gravel and the film until it covers the gravel and smoothed to prevent the gravel from penetrating the film and causing subsequent CO2 leakage. After the film is laid, a clay layer is laid on the outer layer to achieve a reinforcement effect, wherein the thickness of the outer clay layer is greater than 30 cm;

[0028] S6. Fill CO2 into the CO2 curing and aeration layer through the pre-buried pipeline, and control the CO2 concentration to 17vol.%, pressure to 0.3MPa, and humidity to 50%;

[0029] S7, such as Figure 2 As shown, the intelligent monitoring system is connected to the road structure to monitor during negative carbon maintenance: the intelligent monitoring system consists of sensors, intelligent monitoring cabinets and controllers, wherein the sensors include temperature monitoring module 1, humidity monitoring module 2, pressure monitoring module 3 and CO2 concentration monitoring module 4 to realize carbon maintenance status data collection; the controller includes CO2 concentration control module 5, CO2 pressure control module 6, CO2 humidity control module 7 and CO2 recovery and compression module. The sensor transmits data to the intelligent monitoring cabinet, which analyzes the maintenance environment data, adjusts and controls the parameters, and then transmits the signal to the controller, which adjusts the maintenance environment. Example 2

[0030] The method of Example 1 is followed, except that: 1) the negative carbon roadbed cushion layer uses industrial solid waste-based negative carbon gel material to stabilize construction solid waste fine aggregate, the fine aggregate particle size is less than 4.75 mm, the cushion layer has a virtual paving thickness of 130 mm, and a compaction degree of ≥ 97%. It is first rolled 6 times with a vibratory roller, and then statically compacted 2 times with a three-wheel roller, and maintained for no less than 7 days;

[0031] 2) Industrial solid waste-based negative carbon gel material was prepared by dry mixing industrial solid waste 70wt.%, activator calcium oxide 20wt.% and quicklime 10wt.%, and then the crushed coarse aggregate of construction solid waste was soaked in ultrafine cement slurry (water-cement mass ratio of 1.3:1), and then granulated with industrial solid waste-based negative carbon gel material to prepare negative carbon reinforced construction solid waste graded coarse aggregate. The mass ratio of water to industrial solid waste-based negative carbon gel material during granulation was 0.25:1;

[0032] 3) The CO2 curing and aeration layer is laid according to the grading requirements of 31.5-40mm accounting for 15wt.%, 26.5-31.5mm accounting for 18wt.%, 19.5-26.5mm accounting for 24wt.%, 9.5-19.5mm accounting for 23wt.%, and 4.75-9.5mm accounting for 20wt.%. Among them, the dosage of industrial solid waste-based negative carbon gel material is 4wt.% of the CO2 curing and aeration layer. The thickness of the CO2 curing and aeration layer is 130mm, and the compaction degree is ≥97%;

[0033] 4) The negative carbon water-stabilizing layer is laid according to the grading requirements of 19.5-21.5mm accounting for 25wt.%, 9.5-19.5mm accounting for 16 wt.%, 4.7-9.5mm accounting for 24 wt.%, 2.36-4.75mm accounting for 20 wt.%, and 0.5-2.36mm accounting for 15 wt.%. Among them, the amount of cement is 2wt.% of the negative carbon water-stabilizing base layer. The laying thickness of the negative carbon water-stabilizing layer is 150mm, and the compaction degree is ≥98%;

[0034] 5) Inject CO2 into the CO2 curing and aeration layer through the pre-buried pipeline for negative carbon curing, and control the CO2 concentration to 20 vol.%, pressure to 0.2 MPa, and humidity to 65%. Example 3

[0035] The method of Example 1 is followed, except that:

[0036] 1) The negative carbon roadbed cushion layer uses industrial solid waste-based negative carbon gel materials to stabilize fine-grained soil. The fine-grained soil is taken from the sandy soil with a plasticity index greater than 4 at the construction site. The cushion layer has a virtual thickness of 120mm and a compaction degree of ≥97%. It is first rolled 3 times with a vibratory roller and then statically compacted 3 times with a three-wheel roller. The maintenance period is no less than 7 days.

[0037] 2) Industrial solid waste-based negative carbon gel material was prepared by dry mixing according to the mass ratio of 65wt.% of industrial solid waste, 20wt.% of activator magnesium oxide and 15wt.% of quicklime, and then the crushed coarse aggregate of construction solid waste was soaked in a high concentration calcium hydroxide solution (>0.01mol / L), and then granulated with the industrial solid waste-based negative carbon gel material to prepare negative carbon reinforced construction solid waste graded coarse aggregate. The mass ratio of water to the industrial solid waste-based negative carbon gel material during granulation was 0.35:1;

[0038] 3) The CO2 curing and aeration layer is laid according to the grading requirements of 31.5-40mm accounting for 12wt.%, 26.5-31.5mm accounting for 20wt.%, 19.5-26.5mm accounting for 20wt.%, 9.5-19.5mm accounting for 20wt.%, and 4.75-9.5mm accounting for 28wt.%. Among them, the dosage of industrial solid waste-based negative carbon gel material is 5wt.% of the CO2 curing and aeration layer. The thickness of the CO2 curing and aeration layer is 120mm, and the compaction degree is ≥97%;

[0039] 4) The negative carbon water-stabilizing layer is laid according to the grading requirements of 19.5-21.5mm accounting for 27wt.%, 9.5-19.5mm accounting for 25wt.%, 4.7-9.5mm accounting for 23wt.%, 2.36-4.75mm accounting for 15wt.%, and 0.5-2.36mm accounting for 10wt.%, among which the cement content is 6wt.% of the negative carbon water-stabilizing base layer, the laying thickness of the negative carbon water-stabilizing layer is 200mm, and the compaction degree is ≥98%;

[0040] 5) Inject CO2 into the CO2 curing and aeration layer through the pre-buried pipeline for negative carbon curing, and control the CO2 concentration to 23 vol.%, the pressure to 0.1 MPa, and the humidity to 75%.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An information-based automated carbon maintenance method for industrial building solid waste negative carbon road structures, characterized by: After the construction of the negative carbon water-stable base is completed, a relatively closed carbon maintenance environment is created for the road structure, and then humid CO2 gas is injected into the CO2 maintenance gasification layer. With the help of sensors placed on the surface of the negative carbon water-stable base, the controller of the CO2 maintenance gasification layer and the external intelligent monitoring cabinet, the carbon maintenance status is dynamically monitored to realize the collection and recycling of overflow CO2 gas. The industrial construction solid waste negative carbon road structure includes a durable surface layer laid from top to bottom, a negative carbon water-stabilized base layer, a CO2 curing and gasification layer, a negative carbon roadbed cushion layer and a roadbed. The negative carbon roadbed cushion layer is fine-grained soil or construction solid waste fine aggregate stabilized by industrial solid waste-based negative carbon gel materials, the CO2 curing and gasification layer is negative carbon reinforced construction solid waste graded coarse aggregate stabilized by industrial solid waste-based negative carbon gel materials, and the negative carbon water-stabilized base layer is negative carbon reinforced construction solid waste graded coarse aggregate stabilized by cement.

2. The information automated carbon maintenance method according to claim 1, characterized in that: The method for forming a relatively closed carbon maintenance environment is to lay a thickened PE film on the surface of the negative carbon water-stable base layer, and first cover 50-80 mm of clay on both sides of the road structure, then lay a degradable plastic film, and then cover a 120-150 mm clay layer, finally forming a relatively closed carbon maintenance environment.

3. The information automated carbon maintenance method according to claim 1, characterized in that: The sensor includes a temperature monitoring module, a humidity monitoring module, a pressure monitoring module and a CO2 concentration monitoring module to realize the carbon maintenance status data collection; the controller includes a CO2 concentration control module, a CO2 pressure control module, a CO2 humidity control module and a CO2 recovery and compression module to ensure a constant maintenance environment; the intelligent monitoring cabinet dynamically collects and analyzes the carbon maintenance status data through sensors, and then uses the controller to realize real-time adjustment of the CO2 maintenance environment working parameters.

4. The information automated carbon maintenance method according to claim 3, characterized in that: The temperature monitoring module is used to monitor whether the temperature of the carbon maintenance environment is between 20-40°C and upload data to the smart monitoring cabinet. The humidity monitoring module is used to monitor whether the humidity of the carbon maintenance environment is between 50%-75% and upload data to the smart monitoring cabinet. The pressure monitoring module is used to monitor whether the pressure of the carbon maintenance environment is between 0.1-0.3MPa and upload data to the smart monitoring cabinet. The CO2 concentration monitoring module is used to monitor whether the CO2 volume concentration of the carbon maintenance environment is between 17%-23% of the maintenance concentration and upload data to the smart monitoring cabinet.

5. The information automated carbon maintenance method according to claim 1, characterized in that: The industrial solid waste-based negative carbon gel material is prepared by dry mixing industrial solid waste as a precursor, alkali metal oxide or a mixture of strong base and weak acid salt as an activator according to a mass ratio of 65-75wt.% of the precursor, 20-30wt.% of the activator and 5-15wt.% of quicklime.

6. The information automated carbon maintenance method according to claim 1, characterized in that: The negative carbon reinforced construction solid waste graded coarse aggregate is a regenerated negative carbon reinforced aggregate formed by soaking the crushed construction solid waste coarse aggregate in ultrafine cement slurry or calcium hydroxide solution, then encapsulating and granulating the crushed coarse aggregate with industrial solid waste-based negative carbon gel material, and then pre-curing and CO2 curing. The water-cement mass ratio of the ultrafine cement slurry is 1.3-1.5:1, the calcium hydroxide solution is greater than 0.01 mol / L, and the mass ratio of water to the industrial solid waste-based negative carbon gel material during encapsulation and granulation is 0.15-0.35:

1.

7. The information automated carbon maintenance method according to claim 1, characterized in that: The particle size of the fine-grained soil in the negative carbon roadbed cushion layer is ≤2.75mm, the fine-grained soil is sandy soil with a plasticity index greater than 4 or clay or sub-clay with a plasticity index of 10-15, and the organic matter content in the soil is less than 10wt.%, and the moisture content is 16-22%; the dosage of the industrial solid waste-based negative carbon gel material in the negative carbon roadbed cushion layer is 12-15wt.% of the negative carbon roadbed cushion layer, the laying thickness of the negative carbon roadbed cushion layer is 120-150mm, and the compaction degree is ≥97%.

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