Solid-waste-based grouting material for road repair and preparation method of solid-waste-based grouting material

Abstract

The invention provides a solid waste-based grouting material for road repair and a preparation method thereof, and belongs to the technical field of comprehensive utilization of solid wastes. The solid waste-based grouting material for road repair comprises the following components in parts by weight: 20-40 parts of waste concrete fine powder, 10-40 parts of fly ash, 30-80 parts of blast furnace slag, 10-30 parts of red mud, 15-25 parts of scrap iron, 20-33 parts of titanium slag, 3-8 parts of an early strength agent, 2-4 parts of a water reducing agent, 5-6 parts of an expanding agent and 1-4 parts of a composite additive, the titanium slag and the scrap iron are mixed, then hydrochloric acid is added, aeration is performed, heating aging treatment is performed to obtain filtrate and filter residues, and the filtrate and the filter residues are dried to obtain the solid waste-based grouting material for road repair. And uniformly mixing the filter residues with the remaining raw materials, and then adding water and the filtrate to obtain the grouting material. The grouting material has the advantages of being short in setting time, excellent in mechanical property, resistant to corrosion and resistant to freezing, and meanwhile the problem that the recycling efficiency of industrial solid waste and building solid waste garbage is low is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of comprehensive utilization of solid wastes, and in particular relates to a solid waste-based grouting material for road repair and a preparation method thereof. Background Art

[0002] Due to the repeated effects of traffic loads and the influence of environmental factors such as temperature changes, humidity, and chemical erosion, the roadbed and base structure will gradually suffer damage during long-term use. This damage is manifested in uneven settlement of the roadbed, hollowing of base materials, and muddy pavement. These diseases not only affect the service life of the road, but may also lead to a decrease in the strength of the pavement structure, increase driving safety hazards, and reduce the traffic efficiency of the road. In order to reduce economic losses and improve social and economic benefits, rapid repair of the road surface has become a top priority in the development of pavement technology while shortening the traffic blockage time as much as possible.

[0003] Currently, the commonly used materials for road repair are mainly silicate cement, which is mixed with aggregates to form mortar or concrete. Although it has low cost, it has problems such as low bonding interface strength, low bonding strength, and long setting time. Although the commonly used organic grouting materials have good fluidity, strong adhesion, and fast hardening, they are expensive, easy to age, not resistant to high temperatures, and have poor volume compatibility with old concrete. In addition, many organic grouting materials are toxic and will pollute the surrounding groundwater sources.

[0004] With the acceleration of industrialization and urbanization, the output of industrial solid waste and construction solid waste has accumulated year by year and has a wide variety of types. The accumulation of a large amount of solid waste has led to many catastrophic problems, including environmental pollution and ecological damage. If it is not handled and utilized in time, it will inevitably have an adverse impact on society, the environment and resources. Industrial solid waste and construction solid waste can be reused. For example, they can be crushed and added with sand and gravel for paving ground gaps or formed into bricks through molds, reducing the pollution to the environment and the waste of resources caused by direct disposal of garbage. However, the existing solid waste treatment methods still have the problem of low utilization efficiency.

[0005] To this end, the present invention proposes a solid waste-based grouting material for road repair and a preparation method thereof. Summary of the invention

[0006] In order to solve the above technical problems, the present invention proposes a solid waste-based grouting material for road repair and a preparation method thereof.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] One of the technical solutions of the present invention:

[0009] A solid waste-based grouting material for road repair comprises the following raw materials, measured by weight: 20 to 40 parts of waste concrete fine powder, 10 to 40 parts of fly ash, 30 to 80 parts of blast furnace slag, 10 to 30 parts of red mud, 15 to 25 parts of scrap iron, 20 to 33 parts of titanium slag, 3 to 8 parts of early strength agent, 2 to 4 parts of water reducing agent, 5 to 6 parts of expansion agent and 1 to 4 parts of composite admixture.

[0010] Furthermore, the particle sizes of the waste concrete fine powder, fly ash and blast furnace slag are all less than 0.2 mm.

[0011] Furthermore, the particle sizes of the scrap iron and titanium slag are both less than 0.3 mm.

[0012] Furthermore, the specific surface area of ​​the red mud is 150 to 250 m 2 / kg.

[0013] Furthermore, the molar ratio of Ca to Fe in the waste concrete fine powder is (2-3):1.

[0014] Furthermore, the scrap iron is an iron-carbon mixture, wherein the mass ratio of iron to carbon is (1-3):1.

[0015] Furthermore, the early strength agent is one or more of calcium chloride, calcium sulfate, sodium aluminate and sodium nitrite.

[0016] Furthermore, the water reducing agent is a lignin sulfonate or a melamine-based water reducing agent.

[0017] Furthermore, the expansion agent is an alumite expansion agent or a calcium sulphoaluminate expansion agent.

[0018] Furthermore, the composite admixture is prepared by mixing disodium hydrogen phosphate and borax in a weight ratio of (3-4):1.

[0019] Optimally, the solid waste-based grouting material for road repair includes the following raw materials, by weight: 33 parts of waste concrete fine powder, 25 parts of fly ash, 63 parts of blast furnace slag, 18 parts of red mud, 20 parts of scrap iron, 26 parts of titanium slag, 4 parts of early strength agent, 3 parts of water reducing agent, 6 parts of expansion agent and 2 parts of composite admixture.

[0020] The second technical solution of the present invention:

[0021] A method for preparing the solid waste-based grouting material for road repair comprises the following steps:

[0022] Weigh each raw material by weight, mix titanium slag and scrap iron filings, then add hydrochloric acid and aerate to obtain a reaction material, heat and age the reaction material to obtain a filtrate and a filter residue, mix the filter residue with red mud, waste concrete fine powder, fly ash, blast furnace slag, early strength agent, water reducing agent, expansion agent and composite admixture to obtain a mixture, then add the filtrate and water, mix and stir to obtain the solid waste-based grouting material for road repair.

[0023] Furthermore, the amount of hydrochloric acid added is 1 to 3 times the total mass of the titanium slag and the scrap iron, and the concentration of the hydrochloric acid is 1 to 3 mol / L.

[0024] Furthermore, the aeration flow rate is 1 to 3 m 3 / min, and the aeration time is greater than 0.5 hours.

[0025] Furthermore, the temperature of the heating aging treatment is 95-100° C. and the time is 2-4 hours.

[0026] Furthermore, the amount of water added is 20-40% of the total mass of the mixture, and the amount of filtrate added is 5-20% of the total mass of the mixture.

[0027] The technical principles of the present invention are as follows:

[0028] The present invention first mixes titanium slag and scrap iron, then adds hydrochloric acid and aerates to obtain a reaction material, and then heats and ages the reaction material to obtain a filtrate and a filter residue. Under acidic and aerated conditions, the titanium in the titanium slag exists in the form of TiOCl2, and then forms TiO2 attached to the surface of the filter residue after heating and aging, so that the raw material filter residue has a larger specific surface area, providing more contact points, thereby accelerating the coagulation time of the grouting material. The scrap iron contains iron and carbon. Under the action of the electrode difference between iron and carbon, combined with the aeration effect, the Fe-rich 2+ Rapidly oxidized to Fe 3+ Exists in the filtrate. During the mixing process of the filtrate with waste concrete fine powder, fly ash, and blast furnace slag, the Ca in the waste concrete fine powder, fly ash, and blast furnace slag 2+ Fe 3+Calcium iron layered double hydroxide is formed by a coprecipitation method. Calcium iron layered double hydroxide can be used as a nanobridge to combine grouting materials and soil colloids. This structure can ensure the stability and synergistic fixation of the grouting material. In road repair, this stability helps to improve the bonding force between the grouting material and the roadbed, thereby enhancing the overall stability and durability of the road. In addition, solid waste materials such as red mud, fly ash and blast furnace slag can promote hydration reactions under the action of a variety of admixtures, generate more hydration products, form more CSH, CAH, CASH and other gel mixed systems, and improve the strength and stability of the slurry. The present invention can significantly improve the durability of solid waste-based grouting materials for road repair by reasonably matching these solid waste materials and admixtures, thereby improving the quality and durability of road repair.

[0029] Compared with the prior art, the present invention has the following advantages and technical effects:

[0030] (1) The raw materials of the solid waste-based grouting material for road repair of the present invention include various solid wastes such as waste concrete fine powder, fly ash, blast furnace slag, red mud, waste iron filings and titanium slag, which solves the problem of low recycling efficiency of industrial solid waste and construction solid waste and saves material preparation costs.

[0031] (2) The solid waste-based grouting material for road repair prepared by the present invention has the advantages of short setting time, excellent mechanical properties, corrosion resistance and frost resistance, and can be widely used in grouting fields such as highway repair and reinforcement management. It can not only effectively solve the problems of insufficient bearing capacity of the original roadbed and serious damage to the roadbed and base structure, but also can dispose of solid waste in large quantities and alleviate ecological and environmental pollution problems. DETAILED DESCRIPTION

[0032] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0033] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0034] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0035] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0036] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0037] An embodiment of the present invention provides a solid waste-based grouting material for road repair, which includes the following raw materials, measured by weight: 20 to 40 parts of waste concrete fine powder, 10 to 40 parts of fly ash, 30 to 80 parts of blast furnace slag, 10 to 30 parts of red mud, 15 to 25 parts of scrap iron filings, 20 to 33 parts of titanium slag, 3 to 8 parts of early strength agent, 2 to 4 parts of water reducing agent, 5 to 6 parts of expansion agent and 1 to 4 parts of composite admixture.

[0038] In a preferred embodiment of the present invention, the particle sizes of the waste concrete fine powder, fly ash and blast furnace slag are all less than 0.2 mm.

[0039] In a preferred embodiment of the present invention, the particle sizes of the scrap iron and titanium slag are both less than 0.3 mm.

[0040] In a preferred embodiment of the present invention, the specific surface area of ​​the red mud is 150 to 250 m 2 / kg, moisture content ≤10%, pH value ≥10.

[0041] In a preferred embodiment of the present invention, the molar ratio of Ca to Fe in the waste concrete fine powder is (2-3):1. Exemplarily, it is determined that the molar ratio of Ca to Fe in the waste concrete fine powder used in the embodiment of the present invention is 2:1.

[0042] In a preferred embodiment of the present invention, the scrap iron is an iron-carbon mixture, wherein the mass ratio of iron to carbon is (1-3):1. Exemplarily, it has been determined that the mass ratio of iron to carbon in the scrap iron used in the embodiment of the present invention is 1.8:1.

[0043] In a preferred embodiment of the present invention, the early strength agent is one or more of calcium chloride, calcium sulfate, sodium aluminate and sodium nitrite.

[0044] In a preferred embodiment of the present invention, the water reducer is lignin sulfonate or melamine-based water reducer. Exemplarily, the lignin sulfonate used in the embodiment of the present invention is calcium lignin sulfonate, and the melamine-based water reducer used is melamine sulfonate formaldehyde resin.

[0045] In a preferred embodiment of the present invention, the expansion agent is an alumite expansion agent or a calcium sulfoaluminate expansion agent.

[0046] In a preferred embodiment of the present invention, the composite admixture is prepared by mixing disodium hydrogen phosphate and borax in a weight ratio of (3-4):1.

[0047] The solid waste-based grouting material for road repair in the preferred embodiment of the present invention includes the following raw materials, by weight: 33 parts of waste concrete fine powder, 25 parts of fly ash, 63 parts of blast furnace slag, 18 parts of red mud, 20 parts of scrap iron, 26 parts of titanium slag, 4 parts of early strength agent, 3 parts of water reducing agent, 6 parts of expansion agent and 2 parts of composite admixture.

[0048] The embodiment of the present invention also provides a method for preparing the solid waste-based grouting material for road repair, comprising the following steps:

[0049] Weigh each raw material by weight, mix titanium slag and scrap iron filings, then add hydrochloric acid and aerate to obtain a reaction material, heat and age the reaction material to obtain a filtrate and a filter residue, mix the filter residue with red mud, waste concrete fine powder, fly ash, blast furnace slag, early strength agent, water reducing agent, expansion agent and composite admixture to obtain a mixture, then add the filtrate and water, mix and stir to obtain the solid waste-based grouting material for road repair.

[0050] In a preferred embodiment of the present invention, the amount of hydrochloric acid added is 1 to 3 times the total mass of the titanium slag and the scrap iron, and the concentration of the hydrochloric acid is 1 to 3 mol / L.

[0051] In the preferred embodiment of the present invention, the aeration flow rate is 1 to 3 m 3 / min, and the aeration time is greater than 0.5 hours.

[0052] In a preferred embodiment of the present invention, the temperature of the heating aging treatment is 95-100° C. and the time is 2-4 hours.

[0053] In a preferred embodiment of the present invention, the amount of water added is 20-40% of the total mass of the mixture, and the amount of filtrate added is 5-20% of the total mass of the mixture.

[0054] The raw materials used in the embodiments of the present invention are all purchased from the market. Among them, waste concrete fine powder, fly ash and blast furnace slag are ground to a particle size of less than 0.2 mm, waste iron filings and titanium slag are ground to a particle size of less than 0.3 mm, and red mud is ground to a specific surface area of ​​200 m 2 / kg, moisture content = 15.3%, pH value = 12, for standby use; the mass ratio of iron to carbon in the scrap iron is 1.8:1, and the molar ratio of Ca to Fe in the waste concrete fine powder is 2:1.

[0055] In the embodiments of the present invention, "parts" represent "parts by weight" unless otherwise specified.

[0056] The technical solution of the present invention is further illustrated by the following embodiments.

[0057] Example 1

[0058] A method for preparing a solid waste-based grouting material for road repair comprises the following steps:

[0059] The following raw materials were weighed in parts by weight: 33 parts of waste concrete fine powder, 25 parts of fly ash, 63 parts of blast furnace slag, 18 parts of red mud, 20 parts of scrap iron, 26 parts of titanium slag, 4 parts of early strength agent (calcium chloride), 3 parts of water reducing agent (calcium lignin sulfonate), 6 parts of expansion agent (calcium sulfoaluminate expansion agent) and 2 parts of composite admixture (disodium hydrogen phosphate and borax in a weight ratio of 3:1);

[0060] Mix the titanium slag and scrap iron, then add 2 mol / L hydrochloric acid and aerate. The amount of hydrochloric acid added is twice the total mass of the titanium slag and scrap iron, and the aeration flow rate is 1.5m 3 / min, the aeration time is 1 hour to obtain a reaction material, the reaction material is heated and aged at 98°C for 2.5 hours to obtain a filtrate and a filter residue, the filter residue is mixed with red mud, waste concrete fine powder, fly ash, blast furnace slag, early strength agent, water reducing agent, expansion agent and composite admixture to obtain a mixture, and then the filtrate (the amount added is 10% of the total mass of the mixture) and water (the amount added is 38% of the total mass of the mixture) are added and mixed and stirred to obtain a solid waste-based grouting material for road repair.

[0061] Example 2

[0062] A method for preparing a solid waste-based grouting material for road repair comprises the following steps:

[0063] The following raw materials were weighed in parts by weight: 40 parts of waste concrete fine powder, 10 parts of fly ash, 80 parts of blast furnace slag, 10 parts of red mud, 25 parts of scrap iron, 20 parts of titanium slag, 3 parts of early strength agent (calcium sulfate), 4 parts of water reducing agent (melamine sulfonate formaldehyde resin), 6 parts of expansion agent (calcium sulfoaluminate expansion agent) and 1 part of composite admixture (disodium hydrogen phosphate and borax in a weight ratio of 4:1);

[0064] Mix the titanium slag and scrap iron, then add 3 mol / L hydrochloric acid and aerate. The amount of hydrochloric acid added is 1 times the total mass of the titanium slag and scrap iron, and the aeration flow rate is 3m 3 / min, the aeration time is 1.5 hours to obtain a reaction material, the reaction material is heated and aged at 100°C for 2 hours to obtain a filtrate and a filter residue, the filter residue is mixed with red mud, waste concrete fine powder, fly ash, blast furnace slag, early strength agent, water reducing agent, expansion agent and composite admixture to obtain a mixture, and then the filtrate (the amount added is 20% of the total mass of the mixture) and water (the amount added is 40% of the total mass of the mixture) are added and mixed and stirred to obtain a solid waste-based grouting material for road repair.

[0065] Example 3

[0066] A method for preparing a solid waste-based grouting material for road repair comprises the following steps:

[0067] The following raw materials were weighed in parts by weight: 20 parts of waste concrete fine powder, 40 parts of fly ash, 30 parts of blast furnace slag, 30 parts of red mud, 15 parts of scrap iron, 33 parts of titanium slag, 8 parts of early strength agent (sodium aluminate), 2 parts of water reducing agent (calcium lignin sulfonate), 5 parts of expansion agent (alumite expansion agent) and 4 parts of composite admixture (disodium hydrogen phosphate and borax in a weight ratio of 3:1);

[0068] Mix the titanium slag and scrap iron, then add 1 mol / L hydrochloric acid and aerate. The amount of hydrochloric acid added is 3 times the total mass of the titanium slag and scrap iron, and the aeration flow rate is 1m 3 / min, the aeration time is 1 hour to obtain a reaction material, the reaction material is heated and aged at 95°C for 4 hours to obtain a filtrate and a filter residue, the filter residue is mixed with red mud, waste concrete fine powder, fly ash, blast furnace slag, early strength agent, water reducing agent, expansion agent and composite admixture to obtain a mixture, and then the filtrate (the amount added is 5% of the total mass of the mixture) and water (the amount added is 20% of the total mass of the mixture) are added and mixed and stirred to obtain a solid waste-based grouting material for road repair.

[0069] Example 4

[0070] A method for preparing a solid waste-based grouting material for road repair comprises the following steps:

[0071] The following raw materials were weighed in parts by weight: 33 parts of waste concrete fine powder, 22 parts of fly ash, 74 parts of blast furnace slag, 12 parts of red mud, 20 parts of scrap iron, 28 parts of titanium slag, 4 parts of early strength agent (sodium nitrite), 3 parts of water reducing agent (melamine sulfonate formaldehyde resin), 5 parts of expansion agent (calcium sulfoaluminate expansion agent) and 2 parts of composite admixture (disodium hydrogen phosphate and borax in a weight ratio of 3:1);

[0072] Mix the titanium slag and scrap iron, then add 2 mol / L hydrochloric acid and aerate. The amount of hydrochloric acid added is twice the total mass of the titanium slag and scrap iron, and the aeration flow rate is 1.5m 3 / min, the aeration time is 2 hours to obtain a reaction material, the reaction material is heated and aged at 99°C for 3 hours to obtain a filtrate and a filter residue, the filter residue is mixed evenly with red mud, waste concrete fine powder, fly ash, blast furnace slag, early strength agent, water reducing agent, expansion agent and composite admixture to obtain a mixture, and then the filtrate (the amount added is 6% of the total mass of the mixture) and water (the amount added is 36% of the total mass of the mixture) are added and mixed and stirred to obtain a solid waste-based grouting material for road repair.

[0073] Comparative Example 1

[0074] A method for preparing a solid waste-based grouting material for road repair comprises the following steps:

[0075] The following raw materials were weighed in parts by weight: 33 parts of waste concrete fine powder, 25 parts of fly ash, 63 parts of blast furnace slag, 18 parts of red mud, 20 parts of scrap iron, 26 parts of titanium slag, 4 parts of early strength agent (calcium chloride), 3 parts of water reducing agent (calcium lignin sulfonate), 6 parts of expansion agent (calcium sulfoaluminate expansion agent) and 2 parts of composite admixture (disodium hydrogen phosphate and borax in a weight ratio of 3:1);

[0076] Titanium slag, scrap iron, red mud, waste concrete fine powder, fly ash, blast furnace slag, early strength agent, water reducer, expansion agent and composite admixture are mixed evenly to obtain a mixture, and then water (the amount added is 48% of the total mass of the mixture) is added and mixed and stirred evenly to obtain a solid waste-based grouting material for road repair.

[0077] Comparative Example 2

[0078] A method for preparing a solid waste-based grouting material for road repair, which is the same as Example 1, except that the addition of titanium slag is omitted, comprises the following steps:

[0079] The following raw materials were weighed in parts by weight: 33 parts of waste concrete fine powder, 25 parts of fly ash, 63 parts of blast furnace slag, 18 parts of red mud, 20 parts of scrap iron, 4 parts of early strength agent (calcium chloride), 3 parts of water reducing agent (calcium lignin sulfonate), 6 parts of expansion agent (calcium sulfoaluminate expansion agent) and 2 parts of composite admixture (disodium hydrogen phosphate and borax in a weight ratio of 3:1);

[0080] Add 2 mol / L hydrochloric acid to the scrap iron and aerate it. The amount of hydrochloric acid added is twice the mass of the scrap iron and the aeration flow rate is 1.5 m 3 / min, the aeration time is 1 hour to obtain a reaction material, the reaction material is heated and aged at 98°C for 2.5 hours to obtain a filtrate and a filter residue, the filter residue, red mud, waste concrete fine powder, fly ash, blast furnace slag, early strength agent, water reducing agent, expansion agent and composite admixture are mixed uniformly to obtain a mixture, and then the filtrate (the amount added is 10% of the total mass of the mixture) and water (the amount added is 38% of the total mass of the mixture) are added and mixed and stirred uniformly to obtain a solid waste-based grouting material for road repair.

[0081] Comparative Example 3

[0082] A method for preparing a solid waste-based grouting material for road repair, which is the same as Example 1, except that the addition of scrap iron is omitted, comprises the following steps:

[0083] The following raw materials were weighed in parts by weight: 33 parts of waste concrete fine powder, 25 parts of fly ash, 63 parts of blast furnace slag, 18 parts of red mud, 26 parts of titanium slag, 4 parts of early strength agent (calcium chloride), 3 parts of water reducing agent (calcium lignin sulfonate), 6 parts of expansion agent (calcium sulfoaluminate expansion agent) and 2 parts of composite admixture (disodium hydrogen phosphate and borax in a weight ratio of 3:1);

[0084] Add 2 mol / L hydrochloric acid to the titanium slag and aerate it. The amount of hydrochloric acid added is twice the mass of the titanium slag, and the aeration flow rate is 1.5 m 3 / min, the aeration time is 1 hour to obtain a reaction material, the reaction material is heated and aged at 98°C for 2.5 hours to obtain a filtrate and a filter residue, the filter residue, red mud, waste concrete fine powder, fly ash, blast furnace slag, early strength agent, water reducing agent, expansion agent and composite admixture are mixed uniformly to obtain a mixture, and then the filtrate (the amount added is 10% of the total mass of the mixture) and water (the amount added is 38% of the total mass of the mixture) are added and mixed and stirred uniformly to obtain a solid waste-based grouting material for road repair.

[0085] Comparative Example 4

[0086] A method for preparing a solid waste-based grouting material for road repair, which is the same as Example 1, except that the addition of waste concrete fine powder and red mud is omitted, comprises the following steps:

[0087] The following raw materials were weighed in parts by weight: 25 parts of fly ash, 63 parts of blast furnace slag, 20 parts of scrap iron, 26 parts of titanium slag, 4 parts of early strength agent (calcium chloride), 3 parts of water reducing agent (calcium lignin sulfonate), 6 parts of expansion agent (calcium sulfoaluminate expansion agent) and 2 parts of composite admixture (disodium hydrogen phosphate and borax in a weight ratio of 3:1);

[0088] Mix the titanium slag and scrap iron, then add 2 mol / L hydrochloric acid and aerate. The amount of hydrochloric acid added is twice the total mass of the titanium slag and scrap iron, and the aeration flow rate is 1.5m 3 / min, the aeration time is 1 hour to obtain a reaction material, the reaction material is heated and aged at 98°C for 2.5 hours to obtain a filtrate and a filter residue, the filter residue is mixed evenly with fly ash, blast furnace slag, early strength agent, water reducing agent, expansion agent and composite admixture to obtain a mixture, and then the filtrate (the amount added is 10% of the total mass of the mixture) and water (the amount added is 38% of the total mass of the mixture) are added and mixed and stirred to obtain a solid waste-based grouting material for road repair.

[0089] Comparative Example 5

[0090] The same as Example 1, except that the following raw materials are weighed by weight: 10 parts of waste concrete fine powder, 50 parts of fly ash, 20 parts of blast furnace slag, 40 parts of red mud, 30 parts of scrap iron, 10 parts of titanium slag, 2 parts of early strength agent, 5 parts of water reducing agent, 3 parts of expansion agent and 5 parts of composite admixture.

[0091] Performance Testing

[0092] The initial setting time, final setting time, compressive strength, flexural strength, corrosion resistance and frost resistance of the solid waste-based grouting materials for road repair prepared in Examples 1 to 4 and Comparative Examples 1 to 5 were measured with reference to JTG / T 50 "Technical Specifications for Highway Bridge and Culvert Construction", SL 352 "Test Procedures for Hydraulic Concrete" and JC / T1011 "Concrete Anti-Sulfate Corrosion Preservatives". The results are shown in Tables 1 and 2.

[0093] Table 1 Performance test results of grouting materials of Examples 1 to 4 and Comparative Examples 1 to 5

[0094] Initial setting time / min Final setting time / min Corrosion resistance factor Frost resistance level Example 1 176 228 1.02 200 freeze-thaw cycles Example 2 185 232 1.02 198 freeze-thaw cycles Example 3 179 229 1.02 190 freeze-thaw cycles Example 4 183 237 1.01 194 freeze-thaw cycles Comparative Example 1 204 269 0.87 130 freeze-thaw cycles Comparative Example 2 196 254 0.82 148 freeze-thaw cycles Comparative Example 3 194 257 0.95 137 freeze-thaw cycles Comparative Example 4 201 260 0.74 152 freeze-thaw cycles Comparative Example 5 189 251 0.92 176 freeze-thaw cycles

[0095] Table 2 Performance test results of grouting materials of Examples 1 to 4 and Comparative Examples 1 to 5

[0096]

[0097] It can be seen from Table 1 and Table 2 that the grouting material prepared in the embodiment of the present invention has the advantages of short setting time, excellent mechanical properties, corrosion resistance and frost resistance.

[0098] Compared with Example 1, Comparative Example 1 omits the steps of mixing the titanium slag and the scrap iron for aeration and heating and aging, and directly mixes the raw materials. Since the titanium in the titanium slag and the iron in the scrap iron are not easily dissolved, the specific surface area of ​​the mixture and the calcium-iron layered double hydroxide are reduced, and thus the setting time, stability and durability of the grouting material are reduced.

[0099] Compared with Example 1, Comparative Examples 2 to 4 omitted the addition of titanium slag, scrap iron filings, waste concrete fine powder and red mud, respectively, and Comparative Example 5 changed the specific amount of each raw material. Due to the reduction in the types of solid waste materials or the change in the amounts, the hydration reaction process of the solid waste materials was weakened under the action of various admixtures, and the generated hydration products and gel mixed system were reduced, thereby reducing the setting time, stability and durability of the grouting material. This shows that the present invention can significantly improve the durability, thixotropic properties and volume stability of solid waste-based grouting materials for road repair by reasonably matching these solid waste materials and admixtures, thereby improving the quality and durability of road repair.

[0100] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A solid waste-based grouting material for road repair, characterized in that: Calculated by weight, the raw materials include: 20-40 parts of waste concrete fine powder, 10-40 parts of fly ash, 30-80 parts of blast furnace slag, 10-30 parts of red mud, 15-25 parts of scrap iron, 20-33 parts of titanium slag, 3-8 parts of early strength agent, 2-4 parts of water reducing agent, 5-6 parts of expansion agent and 1-4 parts of composite admixture.

2. The solid waste-based grouting material for road repair according to claim 1, characterized in that: The particle sizes of the waste concrete fine powder, fly ash and blast furnace slag are all less than 0.2 mm; and / or The particle sizes of the scrap iron and titanium slag are both less than 0.3 mm; and / or The specific surface area of ​​the red mud is 150 to 250 m 2 / kg.

3. The solid waste-based grouting material for road repair according to claim 2, characterized in that: The molar ratio of Ca to Fe in the waste concrete fine powder is (2-3):1; and / or The scrap iron is an iron-carbon mixture, wherein the mass ratio of iron to carbon is (1-3):

1.

4. The solid waste-based grouting material for road repair according to claim 1, characterized in that: The early strength agent is one or more of calcium chloride, calcium sulfate, sodium aluminate and sodium nitrite; and / or The water reducer is a lignin sulfonate or melamine water reducer; and / or The expansion agent is an alum stone expansion agent or a calcium sulphoaluminate expansion agent.

5. The solid waste-based grouting material for road repair according to claim 1, characterized in that: The composite admixture is prepared by mixing disodium hydrogen phosphate and borax in a weight ratio of (3-4):

1.

6. A method for preparing the solid waste-based grouting material for road repair according to any one of claims 1 to 5, characterized in that: The following steps are involved: Weigh each raw material by weight, mix titanium slag and scrap iron filings, then add hydrochloric acid and aerate to obtain a reaction material, heat and age the reaction material to obtain a filtrate and a filter residue, mix the filter residue with red mud, waste concrete fine powder, fly ash, blast furnace slag, early strength agent, water reducing agent, expansion agent and composite admixture to obtain a mixture, then add the filtrate and water, mix and stir to obtain the solid waste-based grouting material for road repair.

7. The method for preparing the solid waste-based grouting material for road repair according to claim 6, characterized in that: The amount of hydrochloric acid added is 1 to 3 times the total mass of the titanium slag and the scrap iron, and the concentration of the hydrochloric acid is 1 to 3 mol / L.

8. The method for preparing the solid waste-based grouting material for road repair according to claim 6, characterized in that: The aeration flow rate is 1 to 3 m 3 / min, and the aeration time is greater than 0.5 hours.

9. The method for preparing the solid waste-based grouting material for road repair according to claim 6, characterized in that: The temperature of the heating aging treatment is 95-100° C. and the time is 2-4 hours.

10. The method for preparing the solid waste-based grouting material for road repair according to claim 6, characterized in that: The amount of water added is 40-60% of the total mass of the mixture, and the amount of filtrate added is 5-20% of the total mass of the mixture.

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