Concrete for brake bed of highway escape lane, preparation method and application thereof

Abstract

The present application relates to the technical field of concrete, and specifically discloses a concrete for a brake bed in a highway escape lane, and its preparation method and application. The concrete of the present application includes the following components: cement, carbon mineralized mineral material, 20-30 parts of lightweight aggregate, 3-7 parts of modified fiber, 0.4-0.8 parts of foaming agent, 0.02-0.06 parts of foam stabilizer, 2-6 parts of water reducer, and 100-150 parts of mixing water; the lightweight aggregate is made of hollow glass microspheres and ceramsite in a weight ratio of 0.3-1:1; the preparation method of the modified fiber is: after mixing polyvinyl alcohol fiber, propylene triethoxysilane, and starch, placing it in a 20-30°C, 2-6wt% boric acid aqueous solution to react for 24-72h, and drying it. The concrete prepared by the present application using the above technical solution has long-term and stable collapse energy absorption, and the maximum crushing depth is small and the friction coefficient is large.

Description

Technical Field

[0001] The present application relates to the technical field of concrete, and in particular to a concrete for a brake bed of a highway escape lane, and a preparation method and application thereof. Background Art

[0002] As a vital component of modern transportation, the safety and efficiency of highways are crucial for socioeconomic development. However, due to the high speeds on highways, vehicle breakdowns or loss of control can easily lead to serious traffic accidents, resulting in property damage and casualties. Currently, emergency avoidance measures on highways primarily rely on escape lanes. These are specially designed emergency avoidance devices for out-of-control vehicles, typically installed on long downhill sections or in accident-prone areas. They are designed to help out-of-control vehicles safely decelerate and eventually stop, preventing further accidents.

[0003] Traditional brake pads for highway escape lanes are typically constructed from soft materials like gravel and soil, leveraging their high friction and compressibility to rapidly decelerate vehicles. However, this design suffers from limited deceleration, high maintenance costs, and poor adaptability. To address these issues, a more efficient, low-maintenance, and adaptable highway escape lane brake pad is a pressing need.

[0004] Patent CN114481732B achieves emergency braking by setting up a curve area in the middle area of ​​the existing escape lane. The curve area includes a right-turn curve driving marking area (with a roller system), a side-slip deceleration area, and a sand and gravel accumulation protection area. Patent CN112523020B provides a rear-flip front and rear wheel resistance reversal system. As soon as possible, the design and preparation methods of highway escape lanes are also constantly innovating. These new technologies still have certain limitations in practical applications, such as high cost and complex construction. Therefore, there is an urgent need for a new escape lane solution that comprehensively considers cost control, ease of construction and maintenance, so as to meet the actual needs of highway safety management. Summary of the Invention

[0005] In order to overcome the deficiencies in the prior art, the present application provides a concrete for a brake bed of a highway safe lane, a preparation method thereof, and an application thereof.

[0006] In a first aspect, the present application provides a concrete for a brake bed of a highway escape lane, specifically comprising the following components in parts by weight: specifically comprising the following components in parts by weight: 180-220 parts of cement, 40-60 parts of carbon mineralized mineral material, 20-30 parts of lightweight aggregate, 3-7 parts of modified fiber, 0.4-0.8 parts of foaming agent, 0.02-0.06 parts of foam stabilizer, 2-6 parts of water reducer, and 100-150 parts of mixing water;

[0007] The lightweight aggregate is prepared by mixing hollow glass microspheres with a particle size of 0.02-0.06 mm and ceramsite with a particle size of 1-3 mm in a weight ratio of 0.3-1:1;

[0008] The preparation method of the modified fiber is as follows: polyvinyl alcohol fiber, propylene triethoxysilane and starch are mixed in a weight ratio of 100:3-7:12-20, placed in a 20-30°C, 2-6wt% boric acid aqueous solution for reaction for 24-72h, and dried to obtain the modified fiber.

[0009] This application utilizes the above-mentioned technical solution to prepare modified fibers, and by screening and specifying the amounts of cement, carbon mineralized mineral materials, lightweight aggregates, foaming agents, foam stabilizers, water reducers, and mixing water as raw material components of concrete, the prepared concrete for the brake bed of the highway safe lane has long-term stable collapse energy absorption, and has excellent maximum crushing depth and friction coefficient.

[0010] The lightweight aggregate is composed of hollow glass microspheres and ceramsite in a specific weight ratio and specific specifications to optimize the pore structure during the concrete preparation process, ensure the uniform dispersion of various raw material components in the cement raw material, increase the number of active sites, promote the completeness of the mineralization reaction of carbon mineralized mineral materials, and at the same time improve the binding force of modified fibers, thereby improving the performance of concrete.

[0011] In the preparation method of the modified fiber, polyvinyl alcohol fiber, propylene triethoxysilane, and starch are modified in a boric acid aqueous solution, so that the polyvinyl alcohol fiber can be first combined with starch with a certain viscosity, thereby improving the surface structure of the polyvinyl alcohol fiber, making it easier for the modified fiber to combine with other raw materials, thereby improving the dispersion and bonding strength of the steel fiber in the concrete, reducing the slippage between the polyvinyl alcohol fiber and the concrete, making the concrete have excellent impact resistance and resistance, and reducing the probability of deeper crushing and cracking of the concrete due to impact force.

[0012] Preferably, the concrete for the brake bed of the highway escape lane specifically includes the following components in parts by weight: 190-210 parts of cement, 45-55 parts of carbon mineralized mineral materials, 22-27 parts of lightweight aggregate, 4-6 parts of modified fiber, 0.5-0.7 parts of foaming agent, 0.03-0.05 parts of foam stabilizer, 3-5 parts of water reducer, and 110-140 parts of mixing water.

[0013] Preferably, the modified fiber is prepared by mixing polyvinyl alcohol fiber, propylene triethoxysilane, and starch in a weight ratio of 100:4-6:14-18, placing the mixture in a 3-5wt% boric acid aqueous solution at 20-30°C for 24-72 hours, and drying the mixture.

[0014] Preferably, the preparation method of the carbon mineralized mineral material is: weigh a total of 100-300 parts by weight of mineral material and 10-50 parts by weight of water, and put them into a grinding jar equipped with ball mill beads; inject 20%-100% CO2, the CO2 flow rate is 1-3L / min, and start grinding at 400-600rpm for 20-60min; then dry to constant weight, pound and sieve to obtain; the mineral material is selected from one or more of carbon mineralized yellow phosphorus slag, carbon mineralized magnesium slag and carbon mineralized cement clinker, carbon mineralized steel slag, and carbon mineralized carbide slag.

[0015] Adopt the technical scheme of the present application, the resource utilization efficiency that will break through yellow phosphorus slag, magnesium slag is low, environmental pollution is large, and cement clinker, steel slag, carbide slag are large, the shortcoming that dust is low, efficiency is low, energy consumption is high in traditional grinding process.Adopt the wet grinding of appropriate water-solid ratio and the mode of carbon dioxide injection, under mechanochemical coupling, the particle diameter of yellow phosphorus slag and magnesium slag diminishes, and ion dissolution rate accelerates, and generates calcite, aragonite and vaterite type CaCO in carbon mineralization reaction process , the Mg ion of the existence of magnesium slag also can accelerate generation dolomite CaMg (CO ) , these products are alternately overlapped, serve as reactant, nucleator and inert filler with its larger specific surface area in hydration process.Mechanochemical coupling will destroy material surface passivation layer and form new surface that can be supplied for carbon mineralization, further increase the absorption capacity of carbon dioxide from raw material end, reduce the carbon emission of building materials industry, have important environmental significance.

[0016] Preferably, the foaming agent is hydrogen peroxide with a mass concentration of 10-35%.

[0017] Preferably, the foam stabilizer is selected from one or more of methyl cellulose ether (MC), hydroxyethyl cellulose ether (HEC), hydroxyethyl methyl cellulose ether (HEMC), hydroxypropyl methyl cellulose ether (HPMC), stearate series foam stabilizers, styrene-butadiene emulsion, and ethylene-vinyl acetate emulsion.

[0018] Furthermore, the foam stabilizer is composed of a mixture of hydroxypropyl methylcellulose ether and styrene-butadiene emulsion in a weight ratio of 7:0.5-1.5.

[0019] Preferably, the mixing water is a sodium bicarbonate aqueous solution with a molar concentration of 0.10-0.75 mol / L.

[0020] The technical solution of this application uses sodium bicarbonate aqueous solution as mixing water, which makes the carbon dioxide absorption effect further increase the absorption of carbon dioxide, and the HCO3-rich - / CO3 2- It can accelerate the hydration of the slurry and play a role similar to a quick-setting agent. There is no need to add additional accelerating components. It ensures the early strength growth while improving the efficiency of mold use and production efficiency.

[0021] Preferably, the water reducer is selected from one or more of polycarboxylic acid water reducers and naphthalene water reducers.

[0022] In a second aspect, the present application provides a method for preparing the concrete for the brake bed of the above-mentioned highway escape lane, which specifically comprises the following steps in sequence:

[0023] Weigh cement, carbon mineralized mineral material, lightweight aggregate and modified fiber, and mix them until uniform;

[0024] Add mixing water, foam stabilizer and water reducer, stir at 200-600rpm for 60-600s, then stir at 1000-3000rpm for 10-60s;

[0025] Add a foaming agent and stir at a speed of 1000-3000 rpm for 10-60 seconds to obtain a slurry;

[0026] Pour the slurry into the mold and let it stand for 0.5-2 hours to foam;

[0027] Place it in a curing room for 24-48 hours, then demould and continue curing for 28-180 days.

[0028] In a third aspect, the present application provides a brake bed for a highway safe lane, which is prepared using the above-mentioned concrete for the brake bed for a highway safe lane.

[0029] In a fourth aspect, the present application provides a method for preparing the above-mentioned brake bed for the highway safe lane, which specifically comprises the following steps in sequence:

[0030] Transport the cured concrete blocks to the pre-paving location of the brake bed in the highway's escape lane, tightly splice and assemble the modules one by one, and install the top cover on the modules;

[0031] By laying and installing crash barriers, isolation facilities, guardrails, tow lanes, monitoring facilities, lighting facilities, deceleration and energy dissipation facilities, etc. around the brake bed along the exit ramp, a safe lane on the highway can be obtained.

[0032] In summary, the technical solution of this application has the following effects:

[0033] This application utilizes the above-mentioned technical solution to prepare modified fibers, and by screening and specifying the amounts of cement, carbon mineralized mineral materials, lightweight aggregates, foaming agents, foam stabilizers, water reducers, and mixing water as raw material components of concrete, the prepared concrete for the brake bed of the highway safe lane has long-term stable collapse energy absorption, and has excellent maximum crushing depth and friction coefficient.

[0034] The technical solution of the present application, through specific screening of the types and specifications of lightweight aggregates and the preparation method of modified fibers, synergizes with carbon mineralized mineral materials to produce more excellent technical effects, thereby further improving the buffering performance of the prepared concrete.

[0035] The brake bed for the highway escape lane prepared by the technical solution of the present application has a maximum crushing depth of no more than 290mm, a crushing strength of 0.3-0.35MPa, and a friction coefficient of no less than 0.50. It can absorb energy in a long-term and stable manner in accordance with the design standards, providing the buffering effect required for emergency avoidance for various types of accident vehicles, thereby ensuring the safety of vehicles and personnel.

[0036] The technical solution of this application facilitates rapid assembly and installation of modules, while also allowing for tight fixing. The addition of conventional safety indicators reduces project costs, improves construction efficiency, and enhances overall structural stability. After use, the brake pads in highway safety lanes can be directly replaced or repaired, significantly reducing operational costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the components of the highway escape lane of this application; the figure markings are: 1-exit ramp; 2-crash barrier; 3-isolation facility; 4-guardrail; 5-clearance lane; 6-monitoring facility; 7-lighting facility; 8-brake bed; 9-deceleration energy dissipation facility. DETAILED DESCRIPTION

[0038] The present application is further described in detail below in conjunction with examples, comparative examples and performance testing experiments. These examples should not be construed as limiting the scope of protection claimed in this application.

[0039] Yellow phosphorus slag was sourced from the Guizhou Phosphate Chemical Plant; magnesium slag was sourced from a magnesium refinery in Yulin, Shaanxi; polycarboxylate water reducer was purchased from Jiangsu Subote New Materials Co., Ltd.; polyvinyl alcohol fiber and polypropylene fiber were purchased from Anhui Wanwei Group Co., Ltd.; styrene-butadiene emulsion was purchased from Shandong Shengkai Chemical Co., Ltd.; hydroxypropyl methylcellulose ether was purchased from Shijiazhuang Wenyu Wood Cellulose Trading Co., Ltd.; starch was purchased from Dezhou Gaofeng Starch Co., Ltd.; the remaining raw materials were commercially available.

[0040] Example

[0041] Examples 1-5

[0042] Examples 1-5 respectively provide a concrete for a brake bed of a highway escape lane and a preparation method thereof.

[0043] The difference between the above embodiments is that the amount of each component in the concrete for the brake bed of the highway escape lane is different, as shown in Table 1.

[0044] The preparation method of the concrete for the brake bed of the highway escape lane in the above embodiment is as follows:

[0045] Lightweight aggregate: hollow glass microspheres with a particle size of 0.02-0.06 mm and ceramsite with a particle size of 1-3 mm are mixed in a weight ratio of 0.7:1;

[0046] Preparation of modified fiber: Polyvinyl alcohol fiber, propylene triethoxysilane, and starch were mixed in a weight ratio of 100 g: 5 g: 16 g, placed in 1 L of a 4 wt% boric acid aqueous solution at 25° C. to react for 48 hours, and dried at 80° C. to obtain the modified fiber.

[0047] Preparation of carbon mineralized mineral material: Weigh 2000 g of mineral material (1500 g of carbon mineralized yellow phosphorus slag and 500 g of carbon mineralized magnesium slag) and 250 g of water and place them in a grinding jar equipped with ball mill beads. Inject 50% CO2 at a CO2 flow rate of 2 L / min and grind at 200 rpm for 40 min. Then dry to constant weight and pound to pass through a 75 μm sieve.

[0048] Weigh cement, carbon mineralized mineral material, lightweight aggregate and modified fiber, then pour into a blender and mix for 40 seconds until uniform;

[0049] Add 0.4 mol / L sodium bicarbonate aqueous solution, water, foam stabilizer hydroxypropyl methylcellulose ether, and polycarboxylate water reducer, and stir at 400 rpm for 360 s, then at 2000 rpm for 30 s;

[0050] A hydrogen peroxide foaming agent with a mass concentration of 20% was added, and the mixture was stirred at a speed of 2000 rpm for 30 seconds to obtain a slurry;

[0051] Pour the slurry into a 400mm×400mm×400mm mold and let it stand for 1 hour to foam;

[0052] Place in the curing room for 36 hours, then demould and continue curing for 28 days.

[0053] Table 1 Amount of each component in the concrete for the brake bed of the highway escape lane in Examples 1-5 and Comparative Examples 1-3

[0054]

[0055] Examples 6-9

[0056] Examples 6-9 respectively provide a concrete for a brake bed of a highway escape lane and a preparation method thereof.

[0057] The difference between the above embodiment and embodiment 1 is that the types of lightweight aggregates are different, as shown below.

[0058] In Example 6, hollow glass microspheres with a particle size of 0.02-0.06 mm and ceramsite with a particle size of 1-3 mm are mixed in a weight ratio of 0.3:1.

[0059] In Example 7, hollow glass microspheres with a particle size of 0.02-0.06 mm and ceramsite with a particle size of 1-3 mm are mixed in a weight ratio of 1:1.

[0060] In Example 8, hollow glass microspheres with a particle size of 0.02-0.06 mm and ceramsite with a particle size of 1-3 mm are mixed in a weight ratio of 0.5:1.

[0061] In Example 9, hollow glass microspheres with a particle size of 0.02-0.06 mm and ceramsite with a particle size of 1-3 mm are mixed in a weight ratio of 0.8:1.

[0062] The remaining process parameters in the above embodiment are the same as those in Example 1.

[0063] Examples 10-15

[0064] Examples 10-15 respectively provide a concrete for a brake bed of a highway escape lane and a preparation method thereof.

[0065] The difference between the above embodiment and embodiment 1 is that the preparation method of the modified fiber is different, as shown below.

[0066] In Example 10: Preparation of modified fiber: Polyvinyl alcohol fiber, propylene triethoxysilane, and starch were mixed in a weight ratio of 100g:3g:20g, placed in 1L of 4wt% boric acid aqueous solution at 25°C for reaction for 48h, and dried at 80°C to obtain the modified fiber.

[0067] In Example 11: Preparation of modified fiber: Polyvinyl alcohol fiber, propylene triethoxysilane, and starch were mixed in a weight ratio of 100g:7g:12g, placed in a 4wt% boric acid aqueous solution at 25°C for reaction for 48h, and dried at 80°C to obtain the modified fiber.

[0068] In Example 12: Preparation of modified fiber: Polyvinyl alcohol fiber, propylene triethoxysilane, and starch were mixed in a weight ratio of 100g:4g:18g, placed in 1L of 4wt% boric acid aqueous solution at 25°C for reaction for 48h, and dried at 80°C to obtain the modified fiber.

[0069] In Example 13: Preparation of modified fiber: Polyvinyl alcohol fiber, propylene triethoxysilane, and starch were mixed in a weight ratio of 100g:6g:14g, placed in 1L of 4wt% boric acid aqueous solution at 25°C for reaction for 48h, and dried at 80°C to obtain the modified fiber.

[0070] In Example 14: Preparation of modified fiber: Polyvinyl alcohol fiber, propylene triethoxysilane, and starch were mixed in a weight ratio of 100g:5g:17g, placed in 1L of 2wt% boric acid aqueous solution at 25°C for reaction for 48h, and dried at 80°C to obtain the modified fiber.

[0071] In Example 15: Preparation of modified fiber: Polyvinyl alcohol fiber, propylene triethoxysilane, and starch were mixed in a weight ratio of 100g:5g:17g, placed in 1L of 6wt% boric acid aqueous solution at 25°C for reaction for 48h, and dried at 80°C to obtain the modified fiber.

[0072] The remaining process parameters in the above embodiment are the same as those in Example 1.

[0073] Comparative Example

[0074] Comparative Examples 1-3

[0075] Comparative Examples 1-3 respectively provide a concrete and a preparation method thereof.

[0076] The difference between the comparative example and Example 1 is that the amounts of the components in the concrete for the brake bed of the highway escape lane are different, as shown in Table 1.

[0077] The remaining process parameters in the above comparative example are the same as those in Example 1.

[0078] Comparative Examples 4-6

[0079] Comparative Examples 4-6 respectively provide a concrete and a preparation method thereof.

[0080] The differences between the comparative example and Example 1 are specifically as follows.

[0081] In Comparative Example 4, the lightweight aggregate is prepared by mixing hollow glass microspheres with a particle size of 0.02-0.06 mm and ceramsite with a particle size of 4-8 mm in a weight ratio of 1:0.7.

[0082] In Comparative Example 5, an equal amount of unmodified polyvinyl alcohol fibers was used to replace the modified fibers.

[0083] In Comparative Example 6: In the method for preparing the modified fiber, an equal amount of polyethylene fiber is used instead of polyvinyl alcohol fiber to prepare the modified fiber.

[0084] The remaining process parameters in the above comparative example are the same as those in Example 1.

[0085] Performance testing

[0086] The concrete prepared in the embodiment and the comparative example were cured for 28 days, and then the crushability, collapse strength and friction coefficient were tested respectively.

[0087] The maximum crush depth test method is as follows: dry the specimen to constant weight according to the requirements of MH / T 5111-2015, place it under the compression rod of the universal testing machine, make the center line of the specimen coincide with the axis of the compression rod, start the universal testing machine, and record the crush depth during the compression process.

[0088] The crush strength test method is as follows: 100mm×100mm×100mm specimens are cut from the test block and dried to constant weight according to MH / T5111-2015 requirements. The specimens are then placed in a cubic restraint frame and positioned below the compression rod of a universal testing machine, with the specimen centerline aligned with the axis of the compression rod. The universal testing machine is then started and crush curves are plotted for each age. For this application, the average stress value of the 15-45mm plateau section of the crush curve is used as the crush strength.

[0089] The friction coefficient test method is: refer to the pendulum instrument method of JTG 3450-2019 for detection and calculation.

[0090] Test results: as shown in Table 2.

[0091] Table 2 Performance test results of concrete in Examples and Comparative Examples

[0092]

[0093]

[0094] Combined with Table 2, by comparing the performance test results of the concrete in the embodiment and the comparative example, it can be seen that the maximum crushing depth of the concrete prepared using the technical solution provided by the present application is ≤290mm, the collapse strength is 0.3-0.35MPa, and the friction coefficient is ≥0.55.

[0095] By comparing the performance test results of the concrete in Examples 1, 6-9 and Comparative Example 4, the present application selects a lightweight aggregate made by mixing hollow glass microspheres with a particle size of 0.02-0.06 mm and ceramsite with a particle size of 1-3 mm in a weight ratio of 0.3-1:1 as the raw material of concrete, which can further improve the performance of the concrete.

[0096] By comparing the performance test results of the concrete in Examples 1, 10-15 with those in Comparative Examples 5-6, the present application selects a mixture of polyvinyl alcohol fiber, propylene triethoxysilane, and starch in a weight ratio of 100:3-7:12-20, and uses boric acid aqueous solution as a solvent to prepare modified fibers, which can further improve the performance of the concrete.

[0097] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the present invention. Therefore, such modifications and improvements, which do not depart from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A concrete for a brake bed of a highway escape lane, characterized in that: Specifically, it includes the following components in parts by weight: 180-220 parts of cement, 40-60 parts of carbon mineralized mineral material, 20-30 parts of lightweight aggregate, 3-7 parts of modified fiber, 0.4-0.8 parts of foaming agent, 0.02-0.06 parts of foam stabilizer, 2-6 parts of water reducer, and 100-150 parts of mixing water; The lightweight aggregate is prepared by mixing hollow glass microspheres with a particle size of 0.02-0.06 mm and ceramsite with a particle size of 1-3 mm in a weight ratio of 0.3-1:1; The modified fiber is prepared by mixing polyvinyl alcohol fiber, propylene triethoxysilane, and starch in a weight ratio of 100:3-7:12-20, placing the mixture in a 20-30° C., 2-6 wt% boric acid aqueous solution for reaction for 24-72 hours, and drying the mixture. The preparation method of the carbon mineralized mineral material is as follows: weigh a total of 100-300 parts by weight of mineral material and 10-50 parts by weight of water, and place them into a grinding jar equipped with ball mill beads; inject 20%-100% CO2 with a CO2 flow rate of 1-3L / min, and start grinding at 400-600rpm for 20-60min; then dry to constant weight, pound and sieve to obtain the obtained material; the mineral material is selected from one or more of carbon mineralized yellow phosphorus slag, carbon mineralized magnesium slag, carbon mineralized cement clinker, carbon mineralized steel slag, and carbon mineralized carbide slag.

2. The concrete for brake bed of highway escape lane according to claim 1 is characterized in that: Specifically, it includes the following components in parts by weight: 190-210 parts of cement, 45-55 parts of carbon mineralized mineral materials, 22-27 parts of lightweight aggregate, 4-6 parts of modified fiber, 0.5-0.7 parts of foaming agent, 0.03-0.05 parts of foam stabilizer, 3-5 parts of water reducer, and 110-140 parts of mixing water.

3. The concrete for brake bed of highway escape lane according to claim 1 is characterized in that: The preparation method of the modified fiber is as follows: polyvinyl alcohol fiber, propylene triethoxysilane and starch are mixed in a weight ratio of 100:4-6:14-18, placed in a 3-5wt% boric acid aqueous solution at 20-30°C for reaction for 24-72h, and dried to obtain the modified fiber.

4. The concrete for brake bed of highway escape lane according to claim 1, characterized in that: The foaming agent is hydrogen peroxide with a mass concentration of 10-35%.

5. The concrete for brake bed of highway escape lane according to claim 1 is characterized in that: The foam stabilizer is selected from one or more of methyl cellulose ether, hydroxyethyl cellulose ether, hydroxyethyl methyl cellulose ether, hydroxypropyl methyl cellulose ether, stearate series foam stabilizers, styrene-butadiene emulsion, and ethylene-vinyl acetate emulsion.

6. The concrete for brake bed of highway escape lane according to claim 1, characterized in that: The mixing water is a sodium bicarbonate aqueous solution with a molar concentration of 0.10-0.75 mol / L.

7. The method for preparing concrete for brake beds in highway escape lanes according to any one of claims 1 to 6, characterized in that: Specifically, the following steps are performed in sequence: Weigh cement, carbon mineralized mineral material, lightweight aggregate and modified fiber, and mix them until uniform; Add mixing water, foam stabilizer and water reducer, stir at 200-600rpm for 60-600s, then stir at 1000-3000rpm for 10-60s; Add a foaming agent and stir at a speed of 1000-3000 rpm for 10-60 seconds to obtain a slurry; Pour the slurry into the mold and let it stand for 0.5-2 hours to foam; Place it in a curing room for 24-48 hours, then demould and continue curing for 28-180 days.

8. A brake bed for a highway safety lane, characterized in that: The highway escape lane brake bed is prepared using the concrete described in any one of claims 1 to 6.

9. The method for preparing the brake bed for the highway escape lane according to claim 8, characterized in that: Specifically, the following steps are performed in sequence: Transport the cured concrete blocks to the pre-paving location of the brake bed in the highway's emergency lane, tightly assemble the modules one by one, and install the top cover on the modules; By laying and installing crash barriers, isolation facilities, guardrails, tow lanes, monitoring facilities, lighting facilities, deceleration and energy dissipation facilities, etc. around the brake bed along the exit ramp, a brake bed for the safe lane of the expressway can be obtained.

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