Corrosion-inhibiting steel slag asphalt modifier, high-wear-resistance corrosion-inhibiting steel slag asphalt mixture and preparation method of corrosion-inhibiting steel slag asphalt modifier

Abstract

The invention relates to the technical field of road paving materials, and discloses a corrosion-inhibiting steel slag asphalt modifier which comprises an amino acid / molybdate / phosphate multi-element compound corrosion inhibitor, an organic silicon grafted acrylic copolymer, silicic acid salt, a solvent and a coupling agent. The invention further relates to a high-wear-resistance corrosion-inhibiting steel slag asphalt mixture which comprises steel slag coarse aggregate, SBS modified asphalt, limestone, mineral powder filler and a steel slag modifier, and the steel slag modifier is prepared from an amino acid / molybdate / phosphate multi-element compound corrosion inhibitor, an organic silicon grafted acrylic copolymer, a solvent and a coupling agent. Meanwhile, through efficient passivation of the elemental iron, red rust generation sources of the steel slag asphalt pavement are eradicated, the attractiveness and cleanliness of the pavement are maintained for a long time, and durable and stable macroscopic and microscopic textures are formed on the pavement, so that the pavement has the characteristics of long-acting skid resistance and high wear resistance, the driving safety of the pavement is greatly improved, and the service life of the pavement is greatly prolonged.

Description

Technical Field

[0001] This invention relates to the field of road paving materials technology, specifically to a rust-inhibiting steel slag asphalt modifier, a high wear-resistant rust-inhibiting steel slag asphalt mixture, and their preparation methods. Background Technology

[0002] In the context of high-quality development in the current transportation industry, higher demands are placed on the long-term skid resistance and durability of asphalt pavements. However, the energy-intensive mining methods of traditional natural aggregates contradict the concept of green and low-carbon development, leading to increasingly scarce stone resources. Steel slag, as a bulk industrial solid waste, possesses advantages such as high hardness, good wear resistance, and a rough, porous surface, making it an ideal material to replace natural aggregates. It can effectively improve the skid resistance, wear resistance, and high-temperature stability of pavements, resulting in significant social and economic benefits.

[0003] Steel slag has a high content of free calcium oxide (f-CaO) and magnesium oxide (f-MgO), which undergo hydration reactions upon contact with water, resulting in volume expansion and easily causing pavement defects such as expansion cracking. To improve the volume stability of steel slag aggregates, methods such as aging, autoclaving, steam treatment, carbonation, and surface treatment are commonly used to reduce its volume expansion. However, aging is time-consuming and inefficient, while autoclaving, steam treatment, and carbonation are cumbersome, require large equipment investments, consume a lot of energy, and are costly, severely restricting the large-scale and economical application of steel slag. Surface treatment, with its short cycle, high efficiency, and low overall cost, is gradually becoming the most promising mainstream modification direction. Furthermore, the trace amounts of elemental iron remaining in steel slag undergo electrochemical corrosion under the influence of moisture and oxygen, resulting in oxidative volume expansion and the precipitation of a rust-colored solution that pollutes the pavement surface, seriously affecting pavement safety and aesthetics.

[0004] Chinese patent document CN118439820A discloses a rust-proof steel slag asphalt concrete and its preparation method. The rust-proof steel slag asphalt concrete includes the following raw materials in parts by weight: 5-6 parts of SBS modified asphalt, 45-50 parts of steel slag, 36-39 parts of limestone, 3 parts of mineral powder filler, and 4.2-5.5 parts of organosilicon agent. The organosilicon agent includes the following raw materials in parts by weight: 10 parts of acrylic silicone resin; 10 parts of methylbenzene; and 1.1 parts of foaming agent.

[0005] The preparation method of the rust-proof steel slag asphalt concrete includes the following steps: Step S1: Place the organosilicon agent in an ultrasonic cleaner, and simultaneously place the steel slag in the cleaner. Turn on the ultrasonic cleaner and vibrate for 60 seconds. After the organosilicon agent covers the surface of the steel slag, place it in a furnace at 180℃ for curing for 2 hours. Place the fine aggregate, mineral powder filler, and SBS modified asphalt in a furnace at 170℃ and bake for 3-4 hours. Step S2: Mix the cured and baked steel slag and limestone to obtain a dry mixture. Step S3: Place the dry mixture and asphalt in a preheated mixing pot and stir for 2 minutes. Then add the mineral powder filler and continue stirring for 90 seconds to obtain the rust-proof steel slag asphalt concrete.

[0006] The existing technology has the following shortcomings: The existing technology uses acrylic silicone resin, methylbenzene and defoaming agent as raw materials to prepare organosilicon agent, which enables the steel slag surface to synergistically adsorb and form a film structure, blocking pores and cracks, blocking free water in the mixture, so that the steel slag asphalt concrete surface layer can inhibit Fe corrosion during use, but its ability to inhibit Fe corrosion is insufficient and its volume stability is poor. Summary of the Invention

[0007] To address the technical problem of poor rust inhibition and volume stability of existing steel slag asphalt modifiers for asphalt mixtures, this invention provides a rust-inhibiting steel slag asphalt modifier, characterized by comprising an amino acid / molybdate / phosphate multi-component corrosion inhibitor, a solvent, and a coupling agent.

[0008] Preferably, the amino acid / molybdate / phosphate multi-component corrosion inhibitor is formulated by combining amino acids, molybdate, phosphate and solvent, wherein the mass ratio of amino acids, molybdate, phosphate and solvent is 15-55 parts: 3-12 parts: 1.5-8 parts: 50-70 parts.

[0009] To improve corrosion resistance, the steel slag modifier also includes an organosilicon-grafted acrylic copolymer, which can form a continuous and dense barrier film on the surface of the steel slag, fundamentally preventing moisture intrusion.

[0010] Preferably, the organosilicon-grafted acrylic copolymer is prepared by using butyl acrylate and / or methyl methacrylate with vinyltriethoxysilane and / or vinylcyclotetrasiloxane.

[0011] Preferably, the steel slag modifier further includes silicate salts.

[0012] Preferably, the weight ratio of the organosilicon-grafted acrylic copolymer, silicate salt, amino acid / molybdate / phosphate multi-component corrosion inhibitor, solvent and coupling agent is 50-65 parts: 10-25 parts: 4-8 parts: 10-20 parts: 0.6-1.2 parts.

[0013] A high wear-resistant and corrosion-inhibiting steel slag asphalt mixture includes steel slag coarse aggregate, SBS modified asphalt, limestone, mineral powder filler, and steel slag modifier. The steel slag modifier is prepared by an amino acid / molybdate / phosphate multi-component corrosion inhibitor, an organosilicon-grafted acrylic copolymer, silicate salts, solvents, and coupling agents.

[0014] Preferably, the high wear-resistant and corrosion-inhibiting steel slag asphalt mixture is composed of the following raw materials in parts by weight: 50-65 parts steel slag coarse aggregate, 30-45 parts limestone, 4-6 parts mineral powder filler, 4.5-5.5 parts SBS modified asphalt, and 3.5-5.8 parts steel slag modifier. A method for preparing a highly wear-resistant and corrosion-inhibiting steel slag asphalt mixture includes the following steps: Step 1: Impregnate the steel slag coarse aggregate with the steel slag modifier. After the steel slag aggregate has dried and solidified, heat it. Heat the limestone and mineral powder filler, and then heat the SBS modified asphalt until it is completely melted. Step 2: Mix and stir the fully cured and heated steel slag and limestone; Step 3: Pour the fully melted SBS modified asphalt into the mixing pot and mix it with the aggregate. Then add mineral powder filler and continue mixing to obtain a high wear-resistant and corrosion-inhibiting steel slag asphalt mixture.

[0015] Preferably, in step 1, the preparation of the steel slag modifier includes the following steps: Step 1.1: Add the solvent of the formula into a container, keep the water temperature heated, and slowly and evenly add the weighed amino acids, molybdate, and phosphate, while continuously stirring to obtain the corrosion inhibitor concentrate. Step 1.2: Add the organosilicon-grafted acrylic copolymer and silicate salt to another container in proportion, and stir continuously to form a homogeneous viscous liquid; Step 1.3: Add the prepared corrosion inhibitor concentrate and deionized water to the container in Step 1.2, and stir continuously until evenly mixed; Step 1.4: Add the weighed coupling agent to the container in Step 1.3, stir continuously, and let it stand to mature to obtain the steel slag modifier.

[0016] The present invention has the following beneficial effects: 1. This invention utilizes the carboxyl (-COOH) and amino (-NH2) groups from amino acids as polydentate ligands to form a phosphate composite deposition film with phosphate (PO4³⁻), creating a stable organic-inorganic hybrid pre-adsorption layer. This layer not only firmly anchors to the steel slag surface but also "loads" molybdate ions (MoO4²⁻) through coordination bonds, forming a dynamic corrosion-inhibiting network. This network can respond to changes in local pH or chloride ion concentration, rationally controlling the release rate of molybdate to achieve "on-demand supply," greatly extending the effective protection period and achieving a balance between cost control and environmental friendliness. By introducing steel slag modifiers, a synergistic protection system is constructed to prevent steel slag from expanding and corroding. The resulting dense protective film effectively blocks moisture intrusion, inhibits the hydration expansion of f-CaO and f-MgO, and prevents road surface defects such as bulging and cracking. Simultaneously, through efficient passivation of elemental iron, the source of red rust formation in steel slag asphalt pavements is eliminated, maintaining the aesthetics and cleanliness of the road surface for a long time.

[0017] 2. This invention also significantly enhances the adhesion between steel slag and asphalt, significantly improves the water stability and other road performance properties of the mixture, and effectively resists water damage and other defects. Furthermore, it ensures that the steel slag maintains high hardness and high wear resistance over a long period, resulting in durable and stable macro and micro textures on the road surface, thus providing long-lasting anti-skid and high wear resistance properties, greatly improving road safety and service life.

[0018] 3. This invention employs a surface-covalently bonded dense armor layer, surpassing traditional physical adsorption film formation. It utilizes the hydrolysis-condensation reaction of silanoxy groups (-Si-OC2H5) in organosilicon monomers on the hydroxyl groups (-OH) on the steel slag surface to form strong Si-O- chemical bonds. This is equivalent to anchoring the protective film to the steel slag surface with "chemical rivets." The acrylate monomers and organosilicon monomers form an organic-inorganic hybrid dense film on the steel slag surface, which is not only a continuous and dense physical barrier but also an "armor" integrated with the substrate through covalent bonds, isolating the steel slag from moisture. Its excellent toughness (from acrylate segments) and hydrophobicity (from organosilicon segments) ensure that the armor layer does not crack or peel off under stress, thermal expansion and contraction, achieving the ultimate "rigid-flexible" barrier.

[0019] 4. This invention integrates chemical anchoring, reaction intervention, and electrochemical passivation to actively reconstruct and stabilize the surface, bulk, and key active components of steel slag. It designs cross-scale protection from the molecular level (covalent bonding of silane coupling agents), to the nanoscale (reaction of waterproofing agents with f-CaO, etc.), and then to the micron level (adsorption film of corrosion inhibitors on the surface of iron particles). Detailed Implementation

[0020] The following detailed description illustrates the specific implementation method: A corrosion-inhibiting steel slag asphalt modifier comprises an organosilicon-grafted acrylic copolymer, silicate salts, an amino acid / molybdate / phosphate multi-component corrosion inhibitor, a solvent, and a coupling agent.

[0021] The mass ratio of the amino acids, molybdate, phosphate and solvent is: 15-55 parts: 3-12 parts: 1.5-8 parts: 50-70 parts.

[0022] The amino acid is selected from one or more of glutamic acid, aspartic acid, glycine, alanine, and lysine. The preferred mass fractions are 15, 20, 25, 30, 35, 40, 45, and 55 parts.

[0023] The molybdate is selected from one or more of sodium molybdate, potassium molybdate, and ammonium molybdate, and the preferred mass fractions are 3, 5, 7, 9, 10, and 12 parts.

[0024] The phosphate is selected from one or more of sodium dihydrogen phosphate, disodium hydrogen phosphate, trisodium phosphate, and potassium dihydrogen phosphate, and the preferred mass fractions are 1.5 parts, 2 parts, 4 parts, 6 parts, and 8 parts.

[0025] The silicate salts are selected from potassium methylsilicate and / or sodium methylsilicate.

[0026] The solvent is an aqueous alcohol solution, specifically an aqueous ethanol solution or an aqueous propanol solution, used to adjust the viscosity and solid content of the system to ensure that the steel slag modifier has good spraying and wetting performance. The coupling agent is selected from silane coupling agents such as γ-aminopropyltriethoxysilane, which chemically bonds the film-forming agent to the surface of steel slag, thereby improving the durability of the protective film.

[0027] The particle size range of steel slag is 5~10mm and 10~15mm.

[0028] The weight ratio of the organosilicon-grafted acrylic copolymer, silicate salt, amino acid / molybdate / phosphate multi-component corrosion inhibitor, solvent, and coupling agent is 50-65 parts: 10-25 parts: 4-8 parts: 10-20 parts: 0.6-1.2 parts. The preferred weight ratios of the organosilicon-grafted acrylic copolymer are 50, 55, 60, and 65 parts; the preferred weight ratios of the silicate salt are 10, 15, 20, and 25 parts; the preferred weight ratios of the amino acid / molybdate / phosphate multi-component corrosion inhibitor are 4, 6, and 8 parts; the preferred weight ratios of the solvent are 10, 15, and 20 parts; and the preferred weight ratios of the coupling agent are 0.6, 0.8, 1, and 1.2 parts.

[0029] A high wear-resistant and corrosion-inhibiting steel slag asphalt mixture is composed of the following raw materials in parts by weight: 50-65 parts of steel slag coarse aggregate, 30-45 parts of limestone, 4-6 parts of mineral powder filler, 4.5-5.5 parts of SBS modified asphalt, and 3.5-5.8 parts of steel slag modifier.

[0030] Example 1 A high wear-resistant and corrosion-inhibiting steel slag asphalt mixture includes steel slag coarse aggregate, SBS modified asphalt, limestone, mineral powder filler, and steel slag modifier. The steel slag modifier is prepared by an amino acid / molybdate / phosphate multi-component corrosion inhibitor, an organosilicon-grafted acrylic copolymer, silicate salts, solvents, and coupling agents.

[0031] The mass ratio of the amino acids, molybdate, phosphate and solvent is 15 parts: 3 parts: 1.5 parts: 50 parts.

[0032] The organosilicon-grafted acrylic copolymer is prepared by using butyl acrylate and / or methyl methacrylate with vinyltriethoxysilane and / or vinylcyclotetrasiloxane.

[0033] The weight ratio of the organosilicon-grafted acrylic copolymer, silicate salt, amino acid / molybdate / phosphate multi-component corrosion inhibitor, solvent and coupling agent is 50 parts: 10 parts: 4 parts: 10 parts: 0.6 parts.

[0034] A method for preparing a highly wear-resistant and corrosion-inhibiting steel slag asphalt mixture: 1.1. Take the amount of solvent (50 parts of alcohol aqueous solution) according to the formula and add it into the container. Keep the water temperature heated and stable at 15℃±2℃. Slowly and evenly add 15 parts of weighed amino acids, 3 parts of molybdate, and 1.5 parts of phosphate. Stir continuously at 200~600r / min for 15~20min to obtain the corrosion inhibitor concentrate. 1.2 Add 50 parts of organosilicon-grafted acrylic copolymer and 10 parts of silicate salt to another container, and stir continuously at 100~150 r / min for 5~10 min to form a homogeneous viscous liquid; 1.3. Take 4 parts of the prepared corrosion inhibitor concentrate and 10 parts of alcohol aqueous solution and add them to the container in step 1.2. Stir continuously at 300~400r / min for 10min to ensure that the materials are completely and evenly mixed. 1.4 Add 0.6 parts of coupling agent to the container in step 1.3, stir continuously at 100~150 r / min for 10-15 min, and let stand for 30 min to mature to obtain steel slag modifier.

[0035] 2. Take 3.5 parts of the prepared steel slag modifier and treat 50 parts of steel slag coarse aggregate by impregnation. After the steel slag aggregate is dried and cured at 135℃, it is placed in an oven at 180℃ and heated for 4 hours. Place 30 parts of limestone and 4 parts of mineral powder filler in an oven at 180℃ and heat for 4 hours. Place 4.5 parts of SBS modified asphalt in an oven at 165℃ and heat until completely melted. 3. Place the fully solidified and heated steel slag and limestone into a 185℃ mixing pot and dry mix for 90 seconds; 4. Pour the fully melted SBS modified asphalt into the mixing pot and mix it with the aggregate for 150 seconds. Then add the mineral powder filler and continue mixing for 90 seconds to obtain a high wear-resistant and corrosion-inhibiting steel slag asphalt mixture.

[0036] Example 2 A high wear-resistant and corrosion-inhibiting steel slag asphalt mixture includes steel slag coarse aggregate, SBS modified asphalt, limestone, mineral powder filler, and steel slag modifier. The steel slag modifier is prepared by an amino acid / molybdate / phosphate multi-component corrosion inhibitor, an organosilicon-grafted acrylic copolymer, silicate salts, solvents, and coupling agents.

[0037] The mass ratio of the amino acids, molybdate, phosphate, and solvent is 55 parts: 12 parts: 8 parts: 70 parts.

[0038] The organosilicon-grafted acrylic copolymer is prepared by using butyl acrylate and / or methyl methacrylate with vinyltriethoxysilane and / or vinylcyclotetrasiloxane.

[0039] The weight ratio of the organosilicon-grafted acrylic copolymer, silicate salt, amino acid / molybdate / phosphate multi-component corrosion inhibitor, solvent and coupling agent is 65 parts: 25 parts: 8 parts: 20 parts: 1.2 parts.

[0040] A method for preparing a highly wear-resistant and corrosion-inhibiting steel slag asphalt mixture: 1.1. Take the formula amount of solvent (alcohol aqueous solution, 70 parts) and add it to the container. Keep the water temperature heated and stable at 15℃±2℃. Slowly and evenly add 55 parts of weighed amino acids, 12 parts of molybdate, and 8 parts of phosphate. Stir continuously at 200~600r / min for 15~20min to obtain the corrosion inhibitor concentrate. 1.2 Add 65 parts of organosilicon-grafted acrylic copolymer and 25 parts of silicate salt to another container, and stir continuously at 100~150 r / min for 5~10 min to form a homogeneous viscous liquid; 1.3. Take 8 parts of the prepared corrosion inhibitor concentrate and 20 parts of alcohol aqueous solution and add them to the container in step 1.2. Stir continuously at 300~400r / min for 10min to ensure that the materials are completely and evenly mixed. 1.4 Add 1.2 parts of coupling agent to the container in step 1.3, stir continuously at 100~150 r / min for 10-15 min, and let stand for 30 min to mature to obtain steel slag modifier.

[0041] 2. Take 5.8 parts of the prepared steel slag modifier and treat 65 parts of steel slag coarse aggregate by impregnation. After the steel slag aggregate is dried and cured at 135℃, it is placed in an oven at 180℃ and heated for 4 hours. Place 45 parts of limestone and 6 parts of mineral powder filler in an oven at 180℃ and heat for 4 hours. Place 5.5 parts of SBS modified asphalt in an oven at 165℃ and heat until completely melted. 3. Place the fully solidified and heated steel slag and limestone into a 185℃ mixing pot and dry mix for 90 seconds; 4. Pour the fully melted SBS modified asphalt into the mixing pot and mix it with the aggregate for 150 seconds. Then add the mineral powder filler and continue mixing for 90 seconds to obtain a high wear-resistant and corrosion-inhibiting steel slag asphalt mixture.

[0042] Example 3 A high wear-resistant and corrosion-inhibiting steel slag asphalt mixture includes steel slag coarse aggregate, SBS modified asphalt, limestone, mineral powder filler, and steel slag modifier. The steel slag modifier is prepared by an amino acid / molybdate / phosphate multi-component corrosion inhibitor, an organosilicon-grafted acrylic copolymer, silicate salts, solvents, and coupling agents.

[0043] The mass ratio of the amino acids, molybdate, phosphate and solvent is 30 parts: 7 parts: 4 parts: 60 parts.

[0044] The organosilicon-grafted acrylic copolymer is prepared by using butyl acrylate and / or methyl methacrylate with vinyltriethoxysilane and / or vinylcyclotetrasiloxane.

[0045] The weight ratio of the organosilicon-grafted acrylic copolymer, silicate salt, amino acid / molybdate / phosphate multi-component corrosion inhibitor, solvent and coupling agent is 55 parts: 15 parts: 6 parts: 15 parts: 1 part.

[0046] A method for preparing a highly wear-resistant and corrosion-inhibiting steel slag asphalt mixture: 1.1. Take the amount of solvent (alcohol aqueous solution, 60 parts) as specified in the formula and add it to a container. Keep the water temperature heated and stable at 15℃±2℃. Slowly and evenly add 30 parts of weighed amino acids, 7 parts of molybdate, and 4 parts of phosphate. Stir continuously at 200~600r / min for 15~20min to obtain the corrosion inhibitor concentrate. 1.2 Add 55 parts of organosilicon-grafted acrylic copolymer and 15 parts of silicate salt to another container, and stir continuously at 100~150 r / min for 5~10 min to form a homogeneous viscous liquid; 1.3. Take 6 parts of the prepared corrosion inhibitor concentrate and 15 parts of alcohol aqueous solution and add them to the container in step 1.2. Stir continuously at 300~400r / min for 10min to ensure that the materials are completely and evenly mixed. 1.4 Add 1 part of coupling agent to the container in step 1.3, stir continuously at 100~150 r / min for 10-15 min, and let stand for 30 min to mature to obtain steel slag modifier.

[0047] 2. Take 5 parts of the prepared steel slag modifier and treat 55 parts of steel slag coarse aggregate by impregnation. After the steel slag aggregate is dried and cured at 135℃, it is placed in an oven at 180℃ and heated for 4 hours. Place 40 parts of limestone and 5 parts of mineral powder filler in an oven at 180℃ and heat for 4 hours. Place 5 parts of SBS modified asphalt in an oven at 165℃ and heat until completely melted. 3. Place the fully solidified and heated steel slag and limestone into a 185℃ mixing pot and dry mix for 90 seconds; 4. Pour the fully melted SBS modified asphalt into the mixing pot and mix it with the aggregate for 150 seconds. Then add the mineral powder filler and continue mixing for 90 seconds to obtain a high wear-resistant and corrosion-inhibiting steel slag asphalt mixture.

[0048] Example 4 A highly wear-resistant and corrosion-inhibiting steel slag asphalt mixture is prepared by comprising steel slag coarse aggregate, SBS modified asphalt, limestone, mineral filler, and amino acid / molybdate / phosphate multi-component corrosion inhibitor and solvent.

[0049] The mass ratio of the amino acids, molybdate, phosphate and solvent is 30 parts: 7 parts: 4 parts: 60 parts.

[0050] The weight ratio of the amino acid / molybdate / phosphate multi-component corrosion inhibitor to the solvent is 6 parts: 15 parts.

[0051] A method for preparing a highly wear-resistant and corrosion-inhibiting steel slag asphalt mixture: 1. Mix 6 parts of silicone-grafted acrylic copolymer with 15 parts of solvent to form a mixture.

[0052] 2. Take 5.8 parts of the prepared mixture and impregnate 65 parts of steel slag coarse aggregate. After the steel slag aggregate is dried and cured at 135℃, it is placed in an oven at 180℃ and heated for 4 hours. Place 45 parts of limestone and 6 parts of mineral powder filler in an oven at 180℃ and heat for 4 hours. Place 5.5 parts of SBS modified asphalt in an oven at 165℃ and heat until completely melted. 3. Place the fully solidified and heated steel slag and limestone into a 185℃ mixing pot and dry mix for 90 seconds; 4. Pour the fully melted SBS modified asphalt into the mixing pot and mix it with the aggregate for 150 seconds. Then add the mineral powder filler and continue mixing for 90 seconds to obtain a high wear-resistant and corrosion-inhibiting steel slag asphalt mixture.

[0053] Comparative Example 1 A highly wear-resistant and corrosion-inhibiting steel slag asphalt mixture is prepared by comprising steel slag coarse aggregate, SBS modified asphalt, limestone, mineral filler, organosilicon-grafted acrylic copolymer, solvent, and coupling agent.

[0054] The organosilicon-grafted acrylic copolymer is prepared by using butyl acrylate and / or methyl methacrylate with vinyltriethoxysilane and / or vinylcyclotetrasiloxane.

[0055] The weight ratio of the organosilicon-grafted acrylic copolymer, solvent, and coupling agent is 50-65 parts: 10-20 parts: 0.6-1.2 parts.

[0056] A method for preparing a highly wear-resistant and corrosion-inhibiting steel slag asphalt mixture: 1. Mix 55 parts of organosilicon-grafted acrylic copolymer with 15 parts of solvent and 1 part of coupling agent to form a mixture.

[0057] 2. Take 5.8 parts of the prepared mixture and impregnate 65 parts of steel slag coarse aggregate. After the steel slag aggregate is dried and cured at 135℃, it is placed in an oven at 180℃ and heated for 4 hours. Place 45 parts of limestone and 6 parts of mineral powder filler in an oven at 180℃ and heat for 4 hours. Place 5.5 parts of SBS modified asphalt in an oven at 165℃ and heat until completely melted. 3. Place the fully solidified and heated steel slag and limestone into a 185℃ mixing pot and dry mix for 90 seconds; 4. Pour the fully melted SBS modified asphalt into the mixing pot and mix it with the aggregate for 150 seconds. Then add the mineral powder filler and continue mixing for 90 seconds to obtain a high wear-resistant and corrosion-inhibiting steel slag asphalt mixture.

[0058] Comparative Example 2 A high wear-resistant and corrosion-inhibiting steel slag asphalt mixture is prepared by comprising steel slag coarse aggregate, SBS modified asphalt, limestone, mineral powder filler, silicate salts, and solvent.

[0059] The weight ratio of the silicate salt to the solvent is 10-25 parts: 10-20 parts. Preparation method of high wear-resistant and corrosion-inhibiting steel slag asphalt mixture: 1. Mix 15 parts of silicate salt with 15 parts of solvent to form a mixture.

[0060] 2. Take 5.8 parts of the prepared mixture and impregnate 65 parts of steel slag coarse aggregate. After the steel slag aggregate is dried and cured at 135℃, it is placed in an oven at 180℃ and heated for 4 hours. Place 45 parts of limestone and 6 parts of mineral powder filler in an oven at 180℃ and heat for 4 hours. Place 5.5 parts of SBS modified asphalt in an oven at 165℃ and heat until completely melted. 3. Place the fully solidified and heated steel slag and limestone into a 185℃ mixing pot and dry mix for 90 seconds; 4. Pour the fully melted SBS modified asphalt into the mixing pot and mix it with the aggregate for 150 seconds. Then add the mineral powder filler and continue mixing for 90 seconds to obtain a high wear-resistant and corrosion-inhibiting steel slag asphalt mixture.

[0061] Ordinary modified steel slag asphalt mixture A common modified steel slag asphalt mixture is prepared by comprising steel slag coarse aggregate, SBS modified asphalt, limestone, and mineral powder filler.

[0062] A method for preparing a common modified steel slag asphalt mixture: 1. Place 65 parts of steel slag coarse aggregate into a 180℃ oven and heat for 4 hours. Place 45 parts of limestone and 6 parts of mineral powder filler into a 180℃ oven and heat for 4 hours. Place 5.5 parts of SBS modified asphalt into a 165℃ oven and heat until completely melted. 2. Place the fully heated steel slag and limestone into a 185℃ mixing pot and dry mix for 90 seconds; 3. Pour the fully melted SBS modified asphalt into the mixing pot and mix it with the aggregate for 150 seconds. Then add the mineral powder filler and continue mixing for 90 seconds to obtain ordinary modified steel slag asphalt mixture.

[0063] Table 1. Performance Test Results of Steel Slag Asphalt Mixture The steel slag modifiers in Examples 1-3 were prepared using amino acid / molybdate / phosphate multi-component corrosion inhibitors, organosilicon-grafted acrylic copolymers, silicate salts, solvents, and coupling agents in different proportions. In Example 4, the steel slag modifier used only an amino acid / molybdate / phosphate multi-component corrosion inhibitor. Based on the data in the table, the number of spots in Examples 1-3 was 0 under different number of days (30d, 60d, and 90d), while Example 4 showed only one spot after 90 days. Compared to Comparative Example 1 and ordinary modified steel slag asphalt mixture, the multi-component corrosion inhibitors in Examples 1-3 formed a "dynamic supply" mechanism: the organosilicon film blocked moisture, reducing corrosion inhibitor consumption; the corrosion inhibitor was anchored to the steel slag surface through coordination bonds and could respond to pH. The molybdate ion is released as needed to continuously passivate elemental iron by changing the value or chloride ion concentration, achieving no rust for 30 to 90 days, thus completely solving the core problem of poor rust prevention durability in existing technologies; Example 4 also significantly improves rust prevention durability.

[0064] Table 2 Performance of Steel Slag Asphalt Mixture Technical indicators unit Comparative Example 1 Comparative Example 2 Ordinary modified steel slag asphalt mixture Example 1 Example 2 Example 3 Example 4 Dynamic stability at 60℃ times / mm 6598 6874 6736 6929 7081 7312 6625 Low-temperature bending failure strain µɛ 2857 2915 2812 2983 2994 3246 2749 Water immersion Marshall residue stability % 95.4 95.1 93.6 98.5 98.7 99.3 95.8 Freeze-thaw splitting tensile strength ratio % 93.6 94.3 91.5 96.8 97.1 98.3 93.9 600µɛ four-point bending fatigue life Second-rate 290534 313396 307145 332734 335321 362987 278925 Value of display BPN 75.4 74.9 75.2 75.6 75.5 75.9 75.3 10-day immersion swelling rate % 0.52 0.43 0.77 0.28 0.19 0.24 0.71 Number of erythema spots in 90 days Place 2 5 5 0 0 0 1 As shown in Table 2, Examples 1-3, which are steel slag asphalt mixtures modified with steel slag modifiers, significantly improve the basic road performance of steel slag asphalt mixtures compared with Comparative Examples 1 and 2 and ordinary modified steel slag asphalt mixtures. They also reduce the 10-day immersion swelling rate and the number of red spots after 90 days, effectively avoiding the risk of asphalt pavement expansion, cracking, and corrosion. This ensures that the asphalt pavement has excellent basic road performance and a high level of traffic service in the long term, while increasing the cleanliness and aesthetics of the pavement and promoting the high-value-added application of steel slag in the field of road engineering.

[0065] The above comparative results show that the steel slag modifier exhibits the best comprehensive performance in both inhibiting volume expansion and preventing corrosion. Examples 1-3 show significant advantages in core performance aspects such as volume stability (10-day immersion expansion rate ≤0.28%), rust prevention durability (90-day red spot count = 0), durability (fatigue life increased by 18.2%), and water stability (residual stability ≥98.5%), while maintaining the high anti-skid properties of the steel slag itself. Compared with Comparative Examples 1, 2, and ordinary modified steel slag asphalt mixtures, the steel slag modifier of this invention also constructs a multi-level synergistic protection system from the outside to the inside, which can effectively block water penetration, inhibit hydration reactions, and prevent corrosion. This system enables the modified steel slag to possess both excellent volume stability and rust prevention durability, achieving long-term protection.

[0066] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A rust-inhibiting steel slag asphalt modifier, characterized in that, This includes multi-component corrosion inhibitors (amino acids / molybdates / phosphates), solvents, and coupling agents.

2. The anti-corrosion steel slag asphalt modifier according to claim 1, characterized in that: The amino acid / molybdate / phosphate multi-component corrosion inhibitor is formulated by combining amino acids, molybdates, phosphates and solvents, wherein the mass ratio of the amino acids, molybdates, phosphates and solvents is 15-55 parts: 3-12 parts: 1.5-8 parts: 50-70 parts.

3. The anti-corrosion steel slag asphalt modifier according to claim 2, characterized in that: The steel slag modifier also includes organosilicon-grafted acrylic copolymers.

4. The anti-corrosion steel slag asphalt modifier according to claim 3, characterized in that: The organosilicon-grafted acrylic copolymer is prepared by using butyl acrylate and / or methyl methacrylate with vinyltriethoxysilane and / or vinylcyclotetrasiloxane.

5. The anti-corrosion steel slag asphalt modifier according to claim 4, characterized in that: The steel slag modifier also includes silicate salts.

6. The anti-corrosion steel slag asphalt modifier according to claim 5, characterized in that: The weight ratio of the organosilicon-grafted acrylic copolymer, silicate salt, amino acid / molybdate / phosphate multi-component corrosion inhibitor, solvent and coupling agent is 50-65 parts: 10-25 parts: 4-8 parts: 10-20 parts: 0.6-1.2 parts.

7. A high-wear-resistant and corrosion-inhibiting steel slag asphalt mixture, comprising steel slag coarse aggregate, SBS modified asphalt, limestone, mineral powder filler, and steel slag modifier, characterized in that, The steel slag modifier is prepared from an amino acid / molybdate / phosphate multi-component corrosion inhibitor, an organosilicon-grafted acrylic copolymer, silicate salts, solvents, and coupling agents.

8. The high wear-resistant and corrosion-inhibiting steel slag asphalt mixture according to claim 7, characterized in that: It is composed of the following raw materials in parts by weight: 50-65 parts steel slag coarse aggregate, 30-45 parts limestone, 4-6 parts mineral powder filler, 4.5-5.5 parts SBS modified bitumen, and 3.5-5.8 parts steel slag modifier.

9. A method for preparing a high-wear-resistant and corrosion-inhibiting steel slag asphalt mixture, characterized in that, Includes the following steps: Step 1: Treat the steel slag coarse aggregate with steel slag modifier by impregnation. After the steel slag aggregate is dried and solidified, heat it. Heat the limestone and mineral powder filler, and then heat the SBS modified asphalt until it is completely melted. Step 2: Mix and stir the fully cured and heated steel slag and limestone; Step 3: Pour the fully melted SBS modified asphalt into the mixing pot and mix it with the aggregate. Then add mineral powder filler and continue mixing to obtain a high wear-resistant and corrosion-inhibiting steel slag asphalt mixture.

10. The method for preparing high wear-resistant and corrosion-inhibiting steel slag asphalt mixture according to claim 9, characterized in that: Step 1, the preparation of the steel slag modifier includes the following steps: Step 1.1: Add the solvent to a container, keep the water temperature heated, and slowly and evenly add the weighed amino acids, molybdate, and phosphate, while continuously stirring to obtain a corrosion inhibitor concentrate. Step 1.2: Add the organosilicon-grafted acrylic copolymer and silicate salt to another container in proportion, and stir continuously to form a homogeneous viscous liquid; Step 1.3: Add the prepared corrosion inhibitor concentrate and deionized water to the container in Step 1.2, and stir continuously until evenly mixed; Step 1.4: Add the weighed coupling agent to the container in Step 1.3, stir continuously, and let it stand to mature to obtain the steel slag modifier.

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