A lightweight concrete material for traffic engineering barriers and a method for the production thereof

Abstract

The application relates to the technical field of concrete, and particularly discloses a light-weight concrete material for traffic engineering blocking and a preparation method thereof. The light-weight concrete material for traffic engineering blocking provided by the application comprises the following contents in parts by weight: cement clinker 171-209 parts, gypsum 9-11 parts, aluminum-rich-phase industrial solid waste 70-100 parts and water 90-120 parts; the aluminum-rich-phase industrial solid waste has an alumina content of 20-60% and a fineness of less than or equal to 75 mu m; and the application further provides a preparation method of the light-weight concrete material for traffic engineering blocking. The aluminum-rich-phase industrial solid waste is recycled to change waste into treasure, so that a light-weight concrete material for traffic engineering blocking with light texture, stable energy absorption effect and long service life is obtained, and the light-weight concrete material can fully meet the blocking requirements of current traffic safety.

Description

Technical Field

[0001] This application relates to the field of concrete technology, specifically to a lightweight concrete material for use in traffic engineering barriers and its preparation method. Background Technology

[0002] With the commencement of numerous transportation projects, the construction of these major infrastructure projects has placed higher demands on traffic safety. In transportation engineering, especially on highways and airport runways, emergency braking and unexpected impacts of vehicles and aircraft occasionally occur. The energy absorption and long service life performance of traditional barrier materials are no longer sufficient to meet the needs of modern traffic safety.

[0003] The main functional material used in existing airport runway arresting beds is an ultra-lightweight foamed concrete with collapse and energy absorption properties. When an aircraft overruns the runway and enters the arresting bed, the ultra-lightweight foamed concrete collapses under the pressure of the aircraft wheels, thereby absorbing the aircraft's kinetic energy. Under the premise of ensuring the safety of the aircraft and its passengers, the aircraft gradually slows down and eventually stops inside the arresting bed.

[0004] However, existing ultra-lightweight concrete materials still have some shortcomings in practical applications of traffic engineering, such as insufficient energy absorption and inadequate durability. Therefore, there is an urgent need for a lightweight concrete material with stable energy absorption and long service life to meet the current traffic safety requirements. Summary of the Invention

[0005] In order to overcome the problems of insufficient energy absorption and inadequate durability of existing traffic engineering barrier materials, this application provides a lightweight concrete material for traffic engineering barriers and its preparation method.

[0006] This application provides a lightweight concrete material for use as a barrier in traffic engineering, employing the following technical solution:

[0007] A lightweight concrete material for use in traffic engineering barriers comprises the following parts by weight: 171-209 parts cement clinker, 9-11 parts gypsum, 70-100 parts aluminum-rich industrial solid waste, 1-4 parts foaming agent, and 90-120 parts water.

[0008] The alumina content of the aluminum-rich industrial solid waste is 20-60%, and the fineness is ≤75μm.

[0009] This application utilizes cement clinker, gypsum, and aluminous industrial solid waste to prepare a lightweight concrete material for traffic engineering barriers. This material is characterized by its stable energy absorption and long service life. The use of aluminous industrial solid waste promotes its resource utilization and reduces the amount of cement clinker required. The mechanism of action of the aluminous industrial solid waste in concrete is as follows: it regulates the hydration process of C3S in cement clinker, preventing excessively vigorous early hydration reactions in concrete. Simultaneously, it synergistically matches the foaming rate of the foaming agent, promoting the density and uniform, dispersed pores of the concrete material. Furthermore, the aluminate phase generated during the hydration process of the aluminum in the aluminous industrial solid waste fills the pores of the cement matrix, improving the microstructure of the concrete and significantly enhancing the compressive strength and durability of the barrier concrete.

[0010] Optionally, the weight percentage composition of the aluminum-rich industrial solid waste is as follows:

[0011] Aluminum-rich phase industrial solid waste with a particle size of 55μm to 75μm: 1% to 15%;

[0012] Industrial solid waste with aluminum-rich phases of 40μm to 55μm: 20% to 35%;

[0013] Industrial solid waste with aluminum-rich phases of 20μm to 40μm: 45% to 60%;

[0014] Industrial solid waste with aluminum-rich phases <20μm: 1%–5%.

[0015] In this application, the particle size of aluminum-rich industrial solid waste particles affects the performance of lightweight concrete materials used for traffic engineering barriers. Through experimental research, it was found that by further controlling the particle size and proportion of aluminum-rich industrial solid waste particles within the above-mentioned range, the resulting lightweight concrete material for traffic engineering barriers has excellent mechanical strength, collapse resistance, and durability, which can further meet the emergency braking requirements of different types of aircraft and vehicles, ensuring the safety of vehicles and personnel. Among the aforementioned aluminous industrial solid wastes, fine particles with a particle size below 20 μm, due to their extremely fine size, large specific surface area, and rapid hydration rate, inhibit the hydration of C3S, thus affecting the early strength of concrete materials; therefore, their addition amount should not be too high. Aluminous industrial solid waste particles with a particle size of 20 μm to 40 μm have a moderate particle size and a relatively balanced hydration rate, exhibiting some inhibitory effect on C3S hydration, but not a significant one. Furthermore, these fine particles can, to some extent, regulate the hydration process of concrete materials, balancing the hydration rate and collapse energy absorption characteristics, achieving threshold control of collapse energy absorption characteristics. Aluminous industrial solid waste particles with a particle size of 40 μm to 55 μm, due to their larger particle size and relatively smaller specific surface area, have a slower hydration rate and a weaker inhibitory effect on C3S hydration. These particles act as fillers in concrete materials, providing certain mechanical support and improving the overall mechanical properties of the concrete material. The coarse particles of aluminum-rich industrial solid waste with a particle size of 55μm to 75μm have the largest particle size and the slowest hydration rate, and have almost no effect on the hydration of C3S. These particles mainly serve as aggregate fillers, increasing the volume and filling pores in concrete materials. In addition, these particles can dynamically compensate for the decline in collapse performance caused by the later aging of concrete materials, thereby extending the service life of concrete materials.

[0016] In some implementations, the amount of aluminum-rich industrial solid waste added can be 70-80 parts, 70-90 parts, 70-100 parts, 80-90 parts, 80-100 parts, or 90-100 parts.

[0017] In one specific implementation, the amount of aluminum-rich industrial solid waste added can also be 70 parts, 80 parts, 90 parts or 100 parts.

[0018] Optionally, the weight percentage composition of the aluminum-rich industrial solid waste is as follows:

[0019] Industrial solid waste with aluminum-rich phases of 55μm to 75μm: 5% to 10%;

[0020] Industrial solid waste with aluminum-rich phases of 40μm to 55μm: 25% to 35%;

[0021] Industrial solid waste with aluminum-rich phases of 20μm to 40μm: 50% to 60%;

[0022] Industrial solid waste with aluminum-rich phases <20μm: 1%–5%.

[0023] In one specific implementation, the weight percentage of the 55μm to 75μm aluminum-rich phase industrial solid waste can be 1%, 5%, 8%, 10%, or 15%.

[0024] In one specific implementation, the weight percentage of the 40μm to 55μm aluminum-rich phase industrial solid waste can be 20%, 25%, 30%, or 35%.

[0025] In one specific implementation, the weight percentage of the 20μm to 40μm aluminum-rich phase industrial solid waste can be 45%, 50%, 55%, or 60%.

[0026] In one specific implementation, the weight percentage of the <20μm aluminum-rich phase industrial solid waste can be 2%, 4%, or 5%.

[0027] Optionally, the aluminum-rich industrial solid waste is an aluminum-silica industrial solid waste, selected from one or more of coal gangue, shale, metakaolin, alum, red mud, and sludge.

[0028] Optionally, the mineral phase composition of the cement clinker, by weight percentage, includes C3S: 25%–58%, C2S: 30%–50%, C3A: 2%–10%, and C4AF: 10%–18%.

[0029] Optionally, the gypsum is selected from one or more of dihydrate gypsum, fluorogypsum, phosphogypsum, and desulfurized gypsum.

[0030] Optionally, the lightweight concrete material used for traffic engineering barriers further includes: 2-5 parts of foam stabilizer, 1-4 parts of quick-setting agent, 3-9 parts of water-reducing agent, and 0.5-2 parts of fiber.

[0031] Optionally, 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;

[0032] The foaming agent is selected from one or more of the following: rosin-based foaming agents, surfactant-based foaming agents, plant-based foaming agents, animal-based foaming agents, composite foaming agents, ammonium salts, hydrogen peroxide, and aluminum powder.

[0033] Optionally, the accelerator is selected from one or more of alumina clinker accelerators, water glass accelerators, aluminate accelerators, and aluminum sulfate accelerators;

[0034] The water-reducing agent is selected from one or more of the following: polycarboxylate water-reducing agents, naphthalene water-reducing agents, anthracene water-reducing agents, lignin sulfonate water-reducing agents, aminosulfonate water-reducing agents, aliphatic water-reducing agents, and melamine water-reducing agents.

[0035] The fiber is selected from one or more of polypropylene fiber, polyvinyl alcohol fiber, and carbon fiber.

[0036] Secondly, this application provides a method for preparing a lightweight concrete material for traffic engineering barriers, comprising the following steps:

[0037] (1) First, mix cement clinker, gypsum, aluminum-rich industrial solid waste, foam stabilizer and fiber evenly to obtain dry mix;

[0038] (2) Disperse the water-reducing agent evenly in water and add it to the dry mixture, then stir evenly; then add the quick-setting agent and stir evenly to obtain slurry A;

[0039] (3) Add the foaming agent to the slurry A and stir at a speed of 600-2000 rpm for 5-15 seconds to obtain slurry B;

[0040] (4) Pour the slurry B into the mold, wait for the foaming height to reach the top of the mold, and let it stand for 0.5-5 hours; after curing and demolding, obtain lightweight concrete material for traffic engineering barriers.

[0041] In some implementations, the stirring speed in step (3) can be 600-1000 rpm, 600-1500 rpm, 600-2000 rpm, 1000-1500 rpm, 1000-2000 rpm or 1500-2000 rpm.

[0042] In one specific implementation, the stirring speed in step (3) can also be 600 rpm, 1000 rpm, 1500 rpm or 2000 rpm.

[0043] In summary, this application has the following beneficial effects:

[0044] 1. This application uses aluminum-rich industrial solid waste to prepare lightweight concrete materials for traffic engineering barriers, realizing the reuse of waste resources and turning waste into treasure. Furthermore, the obtained concrete material is lightweight, has stable energy absorption effect, and long service life, which can meet the requirements for traffic engineering barrier materials.

[0045] 2. This application uses industrial solid waste with aluminum-rich phases of different particle sizes for compounding, and controls the proportion of each particle size within the following ranges: 55μm~75μm aluminum-rich phase industrial solid waste: 5%~10%; 40μm~55μm aluminum-rich phase industrial solid waste: 25%~35%; 20μm~40μm aluminum-rich phase industrial solid waste: 50%~60%; <20μm aluminum-rich phase industrial solid waste: 1%~5%. The resulting lightweight concrete material has more stable energy absorption and better freeze-thaw resistance. Detailed Implementation

[0046] This application provides a lightweight concrete material for traffic engineering barriers, comprising the following parts by weight: 171-209 parts cement clinker, 9-11 parts gypsum, 70-100 parts alumina-rich industrial solid waste, 1-4 parts foaming agent, 2-5 parts foam stabilizer, 1-4 parts quick-setting agent, 3-9 parts water-reducing agent, 0.5-2 parts fiber, and 90-120 parts water; wherein the alumina-rich industrial solid waste has an alumina content of 20-60% and a fineness ≤75μm.

[0047] The weight percentage composition of the aluminum-rich industrial solid waste is as follows: 1%–15% for aluminum-rich industrial solid waste of 55μm–75μm; 20%–35% for aluminum-rich industrial solid waste of 40μm–55μm; 45%–60% for aluminum-rich industrial solid waste of 20μm–40μm; and 1%–5% for aluminum-rich industrial solid waste <20μm. Further, the weight percentage composition of the aluminum-rich industrial solid waste is as follows: 5%–10% for aluminum-rich industrial solid waste of 55μm–75μm; 25%–35% for aluminum-rich industrial solid waste of 40μm–55μm; 50%–60% for aluminum-rich industrial solid waste of 20μm–40μm; and 1%–5% for aluminum-rich industrial solid waste <20μm. The aluminum-rich industrial solid waste is an aluminum-silica industrial solid waste, selected from one or more of coal gangue, shale, metakaolin, alum, red mud, and sludge.

[0048] The mineral phase composition of the cement clinker, by weight percentage, includes C3S: 25%–58%, C2S: 30%–50%, C3A: 2%–10%, and C4AF: 10%–18%. The gypsum is selected from one or more of dihydrate gypsum, fluorogypsum, phosphogypsum, and desulfurized gypsum.

[0049] 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; the foaming agent is selected from one or more of rosin-type foaming agents, surfactant-type foaming agents, plant-based foaming agents, animal-based foaming agents, composite foaming agents, ammonium salts, hydrogen peroxide, and aluminum powder; the accelerator is selected from one or more of alumina clinker accelerators, water glass accelerators, aluminate accelerators, and aluminum sulfate accelerators; the water-reducing agent is selected from one or more of polycarboxylate-based water-reducing agents, naphthalene-based water-reducing agents, anthracene-based water-reducing agents, lignin sulfonate-based water-reducing agents, aminosulfonate-based water-reducing agents, aliphatic water-reducing agents, and melamine-based water-reducing agents; the fiber is selected from one or more of polypropylene fiber, polyvinyl alcohol fiber, and carbon fiber.

[0050] The preparation method of the aforementioned lightweight concrete material used for traffic engineering barriers includes the following steps:

[0051] (1) First, pour cement clinker, gypsum, aluminum-rich industrial solid waste, foam stabilizer and fiber into the mixer and mix at a speed of 10-600 rpm for 10-60 seconds to obtain dry mix.

[0052] (2) Disperse the water-reducing agent evenly in water and add it to the dry mixture. Mix evenly at a speed of 10-600 rpm. Then add the quick-setting agent and mix at a speed of 10-600 rpm for 60-120 seconds to obtain slurry A.

[0053] (3) Add the foaming agent to the slurry A and stir at a speed of 600-2000 rpm for 5-15 seconds to obtain slurry B;

[0054] (4) Pour the slurry B into the mold, wait for the foaming height to reach the top of the mold, let it stand for 0.5-5 hours; cure in the curing room for 12-72 hours, remove the mold, and continue curing for 28-40 hours to obtain a lightweight concrete material for traffic engineering barriers.

[0055] In the embodiments of this application, the mineral phase composition of the cement clinker, by weight percentage, includes C3S: 45%, C2S: 41%, C3A: 6%, and C4AF: 14%; the gypsum is industrial-grade dihydrate gypsum with a content of 90%; the alumina-rich industrial solid waste is red mud with an alumina content of 45%, and the particle size is ground as needed; the foam stabilizer is hydroxyethyl cellulose ether, purchased from Feicheng Yutian Chemical Co., Ltd.; the water-reducing agent is a polycarboxylate-based water-reducing agent, model PC-311; the foaming agent is a rosin-type foaming agent, purchased from Jinan Junde Trading Co., Ltd.; the quick-setting agent is model ZY-98; the fiber is polypropylene fiber, purchased from Shandong Honggu New Materials; the raw materials, reagents, solvents, etc. of this application can all be obtained commercially.

[0056] The present application will be further described in detail below with reference to the embodiments and performance test results.

[0057] Examples 1-4

[0058] Examples 1-4 provide a lightweight concrete material for use as a barrier in traffic engineering.

[0059] The difference in the above embodiments is that the amount of aluminum-rich industrial solid waste added to the lightweight concrete material used for traffic engineering barriers is shown in Table 1 below.

[0060] The preparation methods of lightweight concrete materials for traffic engineering barriers in Examples 1-4 include the following steps:

[0061] (1) First, pour 20kg of cement clinker, 1kg of dihydrate gypsum, red mud, 0.3kg of foam stabilizer and 0.1kg of fiber into the mixer and mix at 300rpm for 10-60s to obtain dry mix.

[0062] (2) Disperse 0.5 kg of water-reducing agent evenly in 10 kg of water and add it to the dry mixture. Mix evenly at 300 rpm. Then add 0.3 kg of quick-setting agent and mix at 300 rpm for 90 seconds to obtain slurry A.

[0063] (3) Add 0.3 kg of foaming agent to the slurry A and stir at 1000 rpm for 10 s to obtain slurry B;

[0064] (4) Pour the slurry B into the mold, wait for the foaming height to reach the top of the mold, and let it stand for 3 hours; cure in the curing room for 48 hours, remove the mold, and continue curing for 36 hours to obtain a lightweight concrete material for traffic engineering barriers.

[0065] Table 1. Amount of aluminum-rich industrial solid waste added to lightweight concrete materials in Examples 1-4

[0066] Example Amount of aluminum-rich industrial solid waste added (kg) 1 7 2 8 3 9 4 10

[0067] Examples 5-11

[0068] Examples 5-11 provide a lightweight concrete material for use as a barrier in traffic engineering.

[0069] The difference between the above embodiment and Embodiment 2 is that the particle size distribution of aluminum phase industrial solid waste is as shown in Table 2 below.

[0070] Table 2. Particle size distribution of aluminum-rich industrial solid waste in lightweight concrete materials of Examples 2 and 5-11.

[0071]

[0072] Examples 12-14

[0073] Examples 12-14 provide a lightweight concrete material for use as a barrier in traffic engineering.

[0074] The difference between the above embodiment and embodiment 2 is that the stirring speed in step (3) is as shown in Table 3 below.

[0075] Table 3 shows the stirring speed in step (3) of Examples 2 and 12-14.

[0076] Example The stirring speed (rpm) in step (3) 2 1000 12 600 13 1500 14 2000

[0077] Comparative Example 1

[0078] Comparative Example 1 provides a lightweight concrete material for use as a barrier in traffic engineering.

[0079] The difference between the above comparative example and Example 2 is that the amount of aluminum-rich industrial solid waste added to the lightweight concrete material used for traffic engineering barriers is 5 kg.

[0080] Comparative Example 2

[0081] Comparative Example 2 provides a lightweight concrete material for use as a barrier in traffic engineering.

[0082] The difference between the above comparative example and Example 2 is that the amount of aluminum-rich industrial solid waste added to the lightweight concrete material used for traffic engineering barriers is 12 kg.

[0083] Comparative Example 3

[0084] Comparative Example 3 provides a lightweight concrete material for use as a barrier in traffic engineering.

[0085] The difference between the above comparative example and Example 2 is that the stirring speed in step (3) is 400 rpm.

[0086] Performance testing

[0087] The lightweight concrete materials used for traffic engineering barriers obtained in Examples 1-14 and Comparative Examples 1-3 were tested for their performance, and the results are shown in Table 4 below.

[0088] (1) The method for testing dry density is as follows: Refer to JG / T 266—2011 "Foamed Concrete" for testing. Take a set of specimens, measure the length, width, and height of each specimen, calculate the volume V of each specimen, dry the specimens to constant weight, and then weigh the dried specimen mass m0. The dry density is calculated using the following formula:

[0089]

[0090] In the formula:

[0091] ρ0 — Dry density, in kg / m³ 3 m0—mass of the dried specimen, in g; V—volume of the specimen, in mm. 3 .

[0092] (2) The test method for the semi-collapse energy dispersion is as follows: the test and calculation are carried out in accordance with the requirements of MH / T 5111-2015; Note: the smaller the semi-collapse energy dispersion, the more stable the energy absorption characteristics of the concrete material.

[0093] (3) The method for testing the collapse strength is as follows: Cut a 100mm×100mm×100mm specimen from the test block, and bake the specimen to constant weight according to the requirements of MH / T 5111-2015. Then place the specimen in a cubic constraint frame and under the compression rod of the universal testing machine, so that the center line of the specimen coincides with the axis of the compression rod. Start the universal testing machine, record the stress and collapse depth during the compression process, and plot the collapse curves at each age. In this application, the average value of the stress data in the plateau section of the collapse curve from 15 to 45mm is taken as the collapse strength.

[0094] (4) The method for testing the freeze resistance coefficient after 25 freeze-thaw cycles is as follows: testing and calculation are carried out in accordance with the requirements of MH / T 5111-2015.

[0095] (5) The flame retardant performance rating test method is as follows: the test and calculation shall be carried out in accordance with the requirements of GB 8624-2012.

[0096] (6) The test method for the expected service life is as follows: According to the requirements of MH / T 5111-2015, when the above properties of the material meet the standard requirements, the expected service life of the material is considered to be no less than 20 years.

[0097] Table 4. Performance test results of lightweight concrete obtained in Examples 1-14 and Comparative Examples 1-3

[0098]

[0099]

[0100] According to the test results in Table 4, the dry density of the lightweight concrete materials obtained in Examples 1-14 of this application is 183-218 kg / m³. 3 The semi-collapse energy dispersibility is 5.2-6.5%, the collapse strength is 0.30-0.35 MPa, the freeze-thaw resistance coefficient after 25 freeze-thaw cycles is 0.8-1.4, the flame retardant rating is Class A, and the expected service life is not less than 20 years.

[0101] The test results of Examples 1-4 and Comparative Examples 1-2 show that with the increase of the amount of aluminous industrial solid waste added, the dry density and half-collapse energy dispersibility of the obtained lightweight concrete material gradually decrease, while the collapse strength and frost resistance coefficient show a trend of first increasing and then decreasing. The half-collapse energy dispersibility, collapse strength, and frost resistance of the lightweight concrete obtained in Comparative Examples 1-2 are significantly worse than those in Examples 1-4. Therefore, it is shown that by controlling the amount of aluminous industrial solid waste added in this application within the range of 70-100 parts, the lightweight concrete material obtained has good performance and can be used for traffic engineering barriers.

[0102] The test results of Examples 2 and 5-11 show that the semi-collapse energy dispersibility of the lightweight concrete materials obtained in Examples 5-6 and 9-11 is 5.2-5.5% (≤5.5), the collapse strength is 0.34-0.35 MPa, and the frost resistance coefficient after 25 freeze-thaw cycles is 1.2-1.4; while the semi-collapse energy dispersibility of the lightweight concrete materials obtained in Examples 2 and 7-8 is 5.7-6.0% (>5.5), the collapse strength is 0.30-0.32 MPa, and the frost resistance coefficient after 25 freeze-thaw cycles is 0.8-1.1. Therefore, this application further controls the weight percentage composition of each particle size in the aluminum-rich industrial solid waste within the following ranges: 55μm to 75μm aluminum-rich industrial solid waste: 5% to 10%; 40μm to 55μm aluminum-rich industrial solid waste: 25% to 35%; 20μm to 40μm aluminum-rich industrial solid waste: 50% to 60%; <20μm aluminum-rich industrial solid waste: 1% to 5%. The resulting lightweight concrete material exhibits more stable energy absorption and better freeze-thaw resistance.

[0103] The test results of Examples 2, 12-14 and Comparative Example 3 show that in Examples 2 and 12-14, when the stirring speed in step (3) is controlled within the range of 600-2000 rpm, the semi-collapse energy dispersibility of the lightweight concrete material is 5.6-6.6%, the collapse strength is 0.30-0.32 MPa, and the frost resistance coefficient after 25 freeze-thaw cycles is 0.8-1.0; while in Comparative Example 3, when the stirring speed in step (3) is controlled at 400 rpm, the semi-collapse energy dispersibility of the lightweight concrete material is 7.4%, the collapse strength is 0.27 MPa, and the frost resistance coefficient after 25 freeze-thaw cycles is 0.6. Therefore, it is shown that by controlling the stirring speed in step (3) within the range of 600-2000 rpm, the lightweight concrete material obtained in this application has a stable energy absorption effect and good freeze-thaw durability. Furthermore, the semi-collapse energy dispersion of the lightweight concrete materials obtained in Examples 2 and 13 is 5.6-5.8% (≤6.0%), the collapse strength is 0.32 MPa, and the freeze-thaw resistance coefficient after 25 freeze-thaw cycles is 1.0. This indicates that by further controlling the stirring speed in step (3) within the range of 1000-1500 rpm, the lightweight concrete material obtained in this application has a more stable energy absorption effect and better freeze-thaw durability.

[0104] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A lightweight concrete material for traffic engineering barriers, characterized in that, The cement clinker, gypsum, industrial solid waste rich in alumina phase, foaming agent, and water are mixed in the following proportions by weight: cement clinker 171-209 parts, gypsum 9-11 parts, industrial solid waste rich in alumina phase 70-100 parts, foaming agent 1-4 parts, and water 90-120 parts. The industrial solid waste rich in alumina phase is selected from one or more of coal gangue, shale, metakaolin, alunite, red mud, and sludge; and the content of alumina in the industrial solid waste rich in alumina phase is 20-60%. The industrial solid waste rich in alumina phase has the following composition by weight percentage: industrial solid waste rich in alumina phase of 55-75 μm: 5-10%; industrial solid waste rich in alumina phase of 40-55 μm: 25-35%; industrial solid waste rich in alumina phase of 20-40 μm: 50-60%; industrial solid waste rich in alumina phase of <20 μm: 1-5%.

2. Lightweight concrete material for traffic engineering barriers according to claim 1, characterized in that, The mineral phase composition of the cement clinker includes, by weight percentage, C3S: 25-58%, C2S: 30-50%, C3A: 2-10%, and C4AF: 10-18%.

3. Lightweight concrete material for traffic engineering barriers according to claim 1, characterized in that, The gypsum is selected from one or more of fluorogypsum, phosphogypsum, and desulfurization gypsum.

4. Lightweight concrete material for traffic engineering barriers according to any one of claims 1-3, characterized in that, The lightweight concrete material for traffic engineering barriers further includes: 2-5 parts of a foam stabilizer, 1-4 parts of an accelerator, 3-9 parts of a water reducing agent, and 0.5-2 parts of a fiber.

5. Lightweight concrete material for traffic engineering barriers according to claim 4, characterized in that, The foam stabilizer is selected from one or more of methyl cellulose ether, hydroxyethyl cellulose ether, a stearate series foam stabilizer, a butyl benzene emulsion, and an ethylene-vinyl acetate emulsion. The foaming agent is selected from one or more of a plant-based foaming agent, an animal-based foaming agent, a composite foaming agent, an ammonium salt, hydrogen peroxide, and aluminum powder.

6. Lightweight concrete material for traffic engineering barriers according to claim 4, characterized in that, The accelerator is selected from one or more of a water glass-based accelerator, an aluminate-based accelerator, and an aluminum sulfate-based accelerator. The water reducing agent is selected from one or more of a polycarboxylic acid-based water reducing agent, a naphthalene-based water reducing agent, an anthracene-based water reducing agent, a lignin sulfonate-based water reducing agent, an amino sulfonate-based water reducing agent, an aliphatic water reducing agent, and a melamine-based water reducing agent. The fiber is selected from one or more of a polypropylene fiber, a polyvinyl alcohol fiber, and a carbon fiber.

7. A method for the production of lightweight concrete materials for traffic engineering barriers according to any one of claims 4-6, characterized in that, The method includes the following steps: (1) First, the cement clinker, gypsum, industrial solid waste rich in alumina phase, foam stabilizer, and fiber are mixed uniformly to obtain a dry mixture; (2) Then, the water reducing agent is dispersed uniformly in water and added to the dry mixture, which is stirred uniformly; next, the accelerator is added and stirred uniformly to obtain slurry A; (3) The foaming agent is added to the slurry A, which is stirred at a speed of 600-2000 rpm for 5-15 s to obtain slurry B; (4) The slurry B is poured into a mold, and after the foaming height reaches the top end of the mold, it is left to stand for 0.5-5 h; after curing and demolding, the lightweight concrete material for traffic engineering barriers is obtained.

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