CN108046663B - Steel slag-doped recycled asphalt concrete and preparation method thereof - Google Patents
Steel slag-doped recycled asphalt concrete and preparation method thereof Download PDFInfo
- Publication number
- CN108046663B CN108046663B CN201711349397.5A CN201711349397A CN108046663B CN 108046663 B CN108046663 B CN 108046663B CN 201711349397 A CN201711349397 A CN 201711349397A CN 108046663 B CN108046663 B CN 108046663B
- Authority
- CN
- China
- Prior art keywords
- steel slag
- asphalt concrete
- aging
- temperature
- regenerant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00198—Characterisation or quantities of the compositions or their ingredients expressed as mathematical formulae or equations
Abstract
The invention relates to steel slag-doped recycled asphalt concrete which is prepared from the following raw materials: steel slag, waste asphalt concrete, an aging-resistant regenerant, mineral powder and new asphalt; the aging-resistant regenerant comprises base oil, a compatible auxiliary agent, an alkylation antioxidant, an SBS modifier, a light absorber and a stabilizer; base oils include industrial oils and epoxidized soybean oil; the compatible auxiliary agent comprises a wax crystal dispersing auxiliary agent and a low-temperature flow modifier. The preparation method of the steel slag-doped recycled asphalt concrete specifically comprises the following steps: heating steel slag, waste asphalt concrete and new asphalt; mixing and stirring the steel slag heated to the specified temperature and the waste asphalt concrete, adding the new asphalt heated to the specified temperature, adding the anti-aging type regenerant, and finally adding the mineral powder to prepare the steel slag-doped recycled asphalt concrete. The invention has the beneficial effects that: the finished product has excellent high-temperature performance, durability, water stability and secondary aging resistance.
Description
Technical Field
The invention relates to the technical field of highway engineering, in particular to steel slag-doped recycled asphalt concrete and a preparation method thereof.
Background
With the development of the infrastructure of China, the total road traffic mileage of China is the first in the world. In the next 5 to 10 years, the service life of pavement materials mainly made of asphalt concrete is gradually prolonged, China enters a peak of road maintenance, renovation and reconstruction, a large amount of waste asphalt concrete (RAP) is generated at the time, and the development of an efficient recycling technology of the waste asphalt concrete becomes a current research hotspot. On the other hand, China is the first major country of steel production, the discharge amount of steel slag, which is a byproduct of steel making, is over one hundred million tons every year, and the current comprehensive utilization rate is quite low. Generally speaking, the steel slag formed by a proper process has the geometrical shape and the mechanical property similar to those of natural broken macadam, has the characteristics of hardness, rough surface, wear resistance and the like, and has the potential of replacing natural stone to become high-quality asphalt mixture aggregate. Therefore, how to apply the steel slag to road engineering and realize high consumption rate utilization of the steel slag is also a research hotspot at present.
The current research realizes the preparation and application of the recycled asphalt concrete and the steel slag asphalt concrete. The technical measures are as follows: for the recycled asphalt concrete, RAP is mixed with materials such as new aggregate, new asphalt, a regenerant and the like to prepare the asphalt concrete with the performance similar to that of common asphalt concrete, and the technical difficulty lies in whether the performance of the regenerant can comprehensively recover the performance of aged asphalt and whether the regenerant can be well compatible with the aged asphalt in a penetrating way; for steel slag asphalt concrete, steel slag, new aggregate, asphalt and the like are mixed and stirred to prepare a concrete material meeting the requirement of pavement service performance, and the technical difficulties of the steel slag asphalt concrete lie in the aspects of mineral aggregate gradation design, asphalt content design, maximum theoretical density calculation and the like of a mixture.
In the preparation process of the recycled asphalt concrete and the steel slag asphalt concrete, although waste materials such as the waste asphalt concrete and the steel slag can be greatly consumed, part of new aggregate (20-70%) is used in the production process. Therefore, how to combine the waste asphalt concrete and the steel slag to prepare the asphalt concrete avoids or uses new aggregate as little as possible, can effectively reduce stone blasting during mountain opening, plays a role in protecting the ecological environment to a certain extent, uses a large amount of industrial waste in the road construction process, and has remarkable economic and social benefits.
However, compared with the preparation technology of pure recycled asphalt concrete and steel slag asphalt concrete, the preparation technology of asphalt concrete by using waste asphalt concrete and steel slag has the following problems: 1. the steel slag has better heat conductivity than common aggregate, the asphalt concrete structure layer has higher requirement on high temperature resistance under the same solar irradiation condition, the characteristic also provides higher requirement on the performance of the regenerant, and the existing regenerant can not meet the use requirement in the steel slag-doped regenerated asphalt concrete. 2, the steel slag has high water absorption, and in the stirring process, the regenerant is easily adsorbed by the steel slag and cannot be well blended with the aged asphalt, so that the regenerant cannot effectively act on the aged asphalt. 3. The steel slag is much harder than the waste asphalt concrete, and a proper grading form should be adopted to avoid the poor stability of the concrete structure caused by the skeleton formed between the waste asphalt concrete and the steel slag. The application of the recycled asphalt concrete doped with the steel slag is restricted to a great extent by the problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing steel slag-doped recycled asphalt concrete and a preparation method thereof, so as to overcome the defects in the prior art.
The technical scheme for solving the technical problems is as follows: the steel slag-doped recycled asphalt concrete is prepared from the following raw materials: steel slag, waste asphalt concrete, an aging-resistant regenerant, mineral powder and new asphalt; the aging-resistant regenerant is prepared from the following raw materials: base oil, compatible auxiliary agent, alkylation antioxidant, SBS modifier, light absorbent and stabilizer; the base oil is prepared from the following raw materials: industrial oils and epoxidized soybean oil; the compatible auxiliary agent is prepared from the following raw materials: wax crystal dispersing assistant and low temperature flow modifier.
Further, the mass ratio of the steel slag, the waste asphalt concrete, the mineral powder, the new asphalt and the anti-aging type regenerant is as follows:
where ρ isF1Is the tamped density of the steel slag, rhoFIs the apparent density of the steel slag, rhoA1Is the tamped density, rho, of the waste asphalt concreteAIs the apparent density, rho, of the waste asphalt concretekThe density of the mineral powder is shown, and the value of the coefficient Y is 0.01-0.03.
Further, the mass ratio of the base oil, the compatible auxiliary agent, the alkylation antioxidant, the SBS modifier, the light absorber and the stabilizer is 100: (10-20): (0.5-2): (1-80): (0.5-1): (0.1-0.5), the alkylated antioxidant is alkylated diphenylamine antioxidant, the light absorber is ultraviolet light absorber UV-531, the SBS modifier is linear SBS modifier, and the modifier stabilizer is dicumyl peroxide.
Further, the mass ratio of the industrial oil to the epoxidized soybean oil is (60-80): (40-20), the industrial oil is catalytic cracking diesel oil, and the epoxy value of the epoxidized soybean oil is 6.8%.
Further, the mass ratio of the wax crystal dispersing auxiliary agent to the low-temperature flow modifier is (0.5-1): 10-20), the wax crystal dispersing auxiliary agent is microcrystalline wax, the melting point of the microcrystalline wax is 100-105 ℃, and the low-temperature flow modifier is ethylene-vinyl acetate copolymer.
The invention has the beneficial effects that:
1) the finished product has excellent high-temperature performance, durability, water stability and secondary aging resistance, and the steel slag is successfully applied to the preparation of the recycled asphalt concrete, the aggregate of the asphalt concrete is completely composed of industrial waste, no new stone is added, the performance is excellent, the use requirements of high-grade pavements are met, and important technical support can be provided for the treatment technology of solid waste in China;
2) the aromatic component of the base oil adopted by the aging-resistant regenerant is high, the balance of all components of asphalt can be reestablished, the compatibility of the industrial oil used by the aging-resistant regenerant with the epoxidized soybean oil, the SBS modifier, the alkylated antioxidant and the light absorbent can be greatly improved by the prepared compatible additive, and the SBS modifier, the industrial oil and the epoxidized soybean oil can be stably dispersed by adding the over-stabilizer;
3) the wax crystal dispersing agent can perform nucleation and eutectic functions, disperse wax crystals into smaller particles, and is beneficial to improving the plasticity and the anti-deformation capability of asphalt, so that the ageing resistance and various capabilities of the ageing-resistant type regenerant are improved, and the ageing-resistant type regenerant with excellent compatibility and a high-stability system can greatly meet the high requirement of a mixture mixed with steel slag on the regenerant.
The preparation method of the steel slag-doped recycled asphalt concrete specifically comprises the following steps:
s100, heating the steel slag to 210 ℃ below zero at 180 ℃, heating the waste asphalt concrete to 150 ℃ below zero at 120 ℃, and heating the new asphalt to 170 ℃ below zero at 160 ℃ for later use;
s200, mixing and stirring the steel slag heated to the specified temperature and the waste asphalt concrete for 60-90 seconds, adding new asphalt heated to the specified temperature, stirring for 60-90 seconds, adding an aging-resistant type regenerant, stirring for 60-90 seconds, finally adding mineral powder, and stirring for 60-90 seconds to obtain the steel slag-doped recycled asphalt concrete.
Further, in the S100, the grain size of the steel slag is larger than 4.8mm-5.2mm, and the grain size of the waste asphalt concrete is smaller than 4.8mm-5.2 mm.
Furthermore, the crushing value of the steel slag is less than or equal to 24%, the los Angeles abrasion value is less than or equal to 24%, and the water absorption rate is less than or equal to 3%.
Further, the waste asphalt concrete is a waste asphalt concrete material obtained by processing an old asphalt pavement through special equipment.
Further, the new asphalt is No. 70 petroleum asphalt or I-D modified asphalt.
Further, in S200, the specific preparation steps of the base oil are as follows: mixing industrial oil and epoxidized soybean oil according to the weight ratio of (60-80): (40-20), controlling the heating temperature of a water bath to be 60-80 ℃, and heating and stirring the mixture in the water bath for 2-3 h to obtain the base oil.
Further, in S200, the specific preparation steps of the compatibility aid are as follows: mixing the wax crystal dispersing aid and the low-temperature flow modifier according to the mass ratio of (0.5-1) to (10-20), controlling the water bath temperature to be 115-130 ℃, and heating and stirring in a water bath for 0.5-1 h to obtain the compatible aid.
Further, in S200, the specific preparation steps of the aging-resistant recycling agent are as follows: shearing the base oil, the compatible auxiliary agent, the alkylated antioxidant, the SBS modifier, the light absorbent and the stabilizer by using a high-speed shearing machine, wherein the shearing temperature is 140-160 ℃, then preserving heat for 1-2 h in an oven at 120-130 ℃, and cooling to normal temperature after preserving heat to obtain the anti-aging type regenerant.
Further, the shearing time of the base oil, the compatible auxiliary agent, the alkylated antioxidant, the SBS modifier, the light absorbent and the stabilizer in a high-speed shearing machine is 20min-50min, and the rotating speed of the shearing machine is 6000r/min-10000 r/min.
Further, the mineral powder is obtained by grinding limestone, and the passing rate of a 0.075mm sieve pore is 80-95%.
Adopt above-mentioned further beneficial effect to do: by adopting a new design method, the aggregates are mixed in a proper grading mode, so that the steel slag replaces RAP to form a new framework, and the structural stability is improved. In the mixing process, the method of adding asphalt firstly and then adding the regenerant is adopted to avoid the problem that the regenerant is excessively adsorbed by the steel slag so that the efficacy of the regenerant cannot be exerted; in addition, the used alkylated diphenylamine antioxidant is different from the common antioxidant in that the oil solubility of the antioxidant is greatly improved.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The first embodiment is as follows:
1. grading steel slag and (waste asphalt concrete) RAP;
a. placing the steel slag on a 4.8mm screen mesh, and carrying out vibration screening to obtain steel slag on the screen mesh for later use;
b. and (4) placing the RAP into a 4.8mm screen, vibrating and sieving the RAP, and taking the RAP under the sieve for later use.
2. Preparation of aging-resistant regenerant
a. Mixing industrial oil and epoxidized soybean oil according to the weight ratio of 60: 40, controlling the heating temperature of a water bath to be 60 ℃, and heating and stirring the mixture in the water bath for 2 hours to obtain base oil;
b. controlling the water bath temperature at 115 ℃ and stirring in a water bath for 0.5h to obtain a compatible auxiliary agent according to the ratio of 0.5:20 of the wax crystal dispersing auxiliary agent and the low-temperature flow modifier;
c. mixing the obtained base oil, the compatible auxiliary agent, the alkylation antioxidant, the SBS modifier, the light absorbent and the stabilizer according to the proportion of 100: 10: 2: 1: 1: 0.1, adding the mixture, shearing the mixture for 20min by using a high-speed shearing machine, wherein the rotating speed of the shearing machine is 6000r/min, the shearing temperature is 140 ℃, then preserving the heat for 1h in a drying oven at 120 ℃, and cooling the mixture to the normal temperature after preserving the heat to obtain the anti-aging type regenerant.
3. Design of mix proportion
The steel slag-doped recycled asphalt concrete consists of steel slag, RAP, mineral powder, new asphalt and an aging-resistant type regenerant, and the proportion design process is as follows:
a. placing the steel slag obtained by screening in a 10L capacity bucket, and measuring the tamping density rhoF1Is 2.08g.cm3Apparent density of the steel slag is rhoFIs 3.20g.cm3；
b. The RAP obtained by screening was placed in a 5L volumetric flask and its tamped density ρ was measuredA1Is 2.18g.cm3Apparent density of RAP is ρAIs 2.5g.cm3；ρkThe density of the mineral powder is 2.68g.cm3。
c. Mass m of steel slagFThe dosage of RAP is 100, the dosage of RAP mA17.6, m of ore powderkThe mass is 7.2;
d. mass m of aging-resistant type recycling agentcIs the amount m of RAPA5% of (a), its mass is 0.88;
e. mass m of the novel bitumenbIs (m)F+mA+mk) Y, the value of the coefficient Y is 0.03, mbWas 3.7.
Through the steps, the mass ratio of the steel slag, RAP, mineral powder, new asphalt and the anti-aging type regenerant is determined as follows: 100: 17.6: 7.2:3.7:0.88.
4. Mixing of mixed materials
a. According to the mass ratio of 100: 17.6: weighing steel slag, RAP, mineral powder, new asphalt and an aging-resistant regenerant according to the proportion of 7.2:3.7:0.88 for later use;
b. heating steel slag to 180 ℃, RAP to 150 ℃, and new asphalt to 160 ℃;
c. mixing and stirring the steel slag heated to the specified temperature and RAP for 60s, adding new asphalt heated to the specified temperature, stirring for 60s, adding the anti-aging type regenerant, stirring for 60s, finally adding the mineral powder, and stirring for 60s to prepare the steel slag-doped recycled asphalt concrete.
The steel slag is a by-product of steel making, the crushing value of the steel slag is less than or equal to 24%, the los Angeles abrasion value is less than or equal to 24%, the water absorption rate of the steel slag is less than or equal to 3%, and the RAP is a waste asphalt concrete material obtained by processing an old asphalt pavement through special equipment. The industrial oil is catalytic cracking diesel oil, the epoxy value of the epoxidized soybean oil is 6.8%, the wax crystal dispersing auxiliary agent is microcrystalline wax, the melting point is 100-105 ℃, and the low-temperature flowing agent is ethylene-vinyl acetate copolymer. The antioxidant is an alkylated diphenylamine antioxidant, and the light absorber is an ultraviolet light absorber UV-531. The SBS modifier is a linear SBS modifier, and the stabilizer is dicumyl peroxide. The mineral powder is obtained by grinding limestone, and the passing rate of a sieve pore of 0.075mm is 80-95%. The new asphalt is No. 70 petroleum asphalt or I-D modified asphalt.
Example 2:
1. and (4) grading steel slag and RAP.
a. Placing the steel slag on a 5mm screen mesh, and carrying out vibration screening to obtain steel slag on the screen mesh for later use;
B. and (4) placing the RAP into a 5mm screen, vibrating and sieving the RAP, and taking the RAP under the sieve for later use.
2. Preparation of aging-resistant regenerant
a. Mixing industrial oil and epoxidized soybean oil according to a ratio of 65: 35, controlling the heating temperature of a water bath to be 70 ℃, and heating and stirring the mixture in the water bath for 2 hours to obtain base oil;
b. controlling the water bath temperature to be 125 ℃ and heating and stirring in a water bath for 0.5h according to the ratio of 0.7:19 of the wax crystal dispersing aid and the low-temperature flow modifier to obtain a compatible aid;
c. mixing the obtained base oil, the compatible auxiliary agent, the alkylation antioxidant, the SBS modifier, the light absorbent and the stabilizer according to the proportion of 100: 13: 1.5: 30: 1.5: 0.1, adding the mixture, shearing the mixture for 20min by using a high-speed shearing machine, wherein the rotating speed of the shearing machine is 6000r/min, the shearing temperature is 150 ℃, then preserving the heat for 1h in a drying oven at 125 ℃, and cooling the mixture to the normal temperature after preserving the heat to obtain the anti-aging regenerant.
3. Design of mix proportion
The steel slag-doped recycled asphalt concrete consists of steel slag, RAP, mineral powder, new asphalt and an aging-resistant type regenerant, and the proportion design process is as follows:
a. the obtained steel slag was placed in a 10L capacity bucket, and its tamped density ρ was measuredF1Is 2.08g.cm3Apparent density of the steel slag is rhoFIs 3.20g.cm3；ρkThe density of the mineral powder is 2.68g.cm3。
b. The RAP thus obtained was placed in a 5L volumetric flask and its tamped density ρ was measuredA1Is 2.18g.cm3Apparent density of RAP is ρAIs 2.5g.cm3；
c. Mass m of steel slagFThe dosage of RAP is 100, the dosage of RAP mA17.6, m of ore powderkThe mass is 7.2;
d. mass m of aging-resistant type recycling agentcIs the amount m of RAPA10% of (a), its mass is 1.76;
e. mass m of the novel bitumenbIs (m)F+mA+mk) Y, the value of the coefficient Y is 0.025, mbWas 3.12.
Through the steps, the mass ratio of the steel slag, RAP, mineral powder, new asphalt and the anti-aging type regenerant is determined as follows: 100: 17.6: 7.2:3.12:1.76.
4 mixing of the mixture
a. According to the mass ratio of 100: 17.6: weighing steel slag, RAP, mineral powder, new asphalt and an aging-resistant regenerant according to the proportion of 7.2:3.12:1.76 for later use;
b. heating steel slag to 180 ℃, RAP to 150 ℃, and new asphalt to 160 ℃;
c. mixing and stirring the steel slag heated to the specified temperature and RAP for 60s, adding new asphalt heated to the specified temperature, stirring for 60s, adding the anti-aging type regenerant, stirring for 60s, finally adding the mineral powder, and stirring for 60s to prepare the steel slag-doped recycled asphalt concrete.
The steel slag is a by-product of steel making, the crushing value of the steel slag is less than or equal to 24%, the los Angeles abrasion value is less than or equal to 24%, the water absorption rate of the steel slag is less than or equal to 3%, and the RAP is a waste asphalt concrete material obtained by processing an old asphalt pavement through special equipment. The industrial oil is catalytic cracking diesel oil, the epoxy value of the epoxidized soybean oil is 6.8%, the wax crystal dispersing auxiliary agent is microcrystalline wax, the melting point is 100-105 ℃, and the low-temperature flowing agent is ethylene-vinyl acetate copolymer. The antioxidant is an alkylated diphenylamine antioxidant, and the light absorber is an ultraviolet light absorber UV-531. The SBS modifier is a linear SBS modifier, and the stabilizer is dicumyl peroxide. The mineral powder is obtained by grinding limestone, and the passing rate of a sieve pore of 0.075mm is 80-95%. The new asphalt is No. 70 petroleum asphalt or I-D modified asphalt.
Example 3:
1. and (4) grading steel slag and RAP.
a. Placing the steel slag on a 5mm screen mesh, and carrying out vibration screening to obtain steel slag on the screen mesh for later use;
b. and (4) placing the RAP into a 5mm screen, vibrating and sieving the RAP, and taking the RAP under the sieve for later use.
2. Preparation of aging-resistant regenerant
a. Mixing industrial oil and epoxidized soybean oil according to a ratio of 70: 30, controlling the heating temperature of a water bath to be 70 ℃, and heating and stirring in the water bath for 3 hours to obtain base oil;
b. controlling the water bath temperature to be 125 ℃ and heating and stirring in a water bath for 1h to obtain a compatible auxiliary agent according to the ratio of 0.6:19.5 of the wax crystal dispersing auxiliary agent to the low-temperature flow modifier;
c. mixing the obtained base oil, the compatible auxiliary agent, the alkylation antioxidant, the SBS modifier, the light absorbent and the stabilizer according to the proportion of 100: 17: 1: 60: 1: 0.5, adding the mixture, shearing for 50min by using a high-speed shearing machine, wherein the rotating speed of the shearing machine is 10000r/min, the shearing temperature is 150 ℃, preserving heat for 2h in a drying oven at 125 ℃, and cooling to normal temperature after preserving heat to obtain the anti-aging type regenerant.
3. Design of mix proportion
The steel slag-doped recycled asphalt concrete consists of steel slag, RAP, mineral powder, new asphalt and an aging-resistant type regenerant, and the proportion design process is as follows:
a. placing the steel slag obtained by screening in a 10L capacity bucket, and measuring the tamping density rhoF1Is 2.08g.cm3Apparent density of the steel slag is rhoFIs 3.20g.cm3；ρkThe density of the mineral powder is 2.68g.cm3。
b. The RAP obtained by screening was placed in a 5L volumetric flask and its tamped density ρ was measuredA1Is 2.18g.cm3Apparent density of RAP is ρAIs 2.5g.cm3；
c. Mass m of steel slagFThe dosage of RAP is 100, the dosage of RAP mA17.6, m of ore powderkThe mass is 7.2;
d. mass m of aging-resistant type recycling agentcIs the amount m of RAPA15% of (a), its mass is 2.64;
e. mass m of the novel bitumenbIs (m)F+mA+mk) Y, the value of the coefficient Y is 0.015 mbIs 1.87;
through the steps, the mass ratio of the steel slag, RAP, mineral powder, new asphalt and the anti-aging type regenerant is determined as follows: 100: 17.6: 7.2:1.87:2.64.
4 mixing of the mixture
a. According to the mass ratio of 100: 17.6: weighing steel slag, RAP, mineral powder, new asphalt and an aging-resistant regenerant according to the proportion of 7.2:1.87:2.64 for later use;
b. heating steel slag to 210 ℃, heating RAP to 120 ℃, and heating new asphalt to 170 ℃;
c. mixing and stirring the steel slag heated to the specified temperature and RAP for 90s, adding new asphalt heated to the specified temperature, stirring for 90s, adding the anti-aging type regenerant, stirring for 90s, finally adding the mineral powder, and stirring for 90s to prepare the steel slag-doped recycled asphalt concrete.
The steel slag is a by-product of steel making, the crushing value of the steel slag is less than or equal to 24%, the los Angeles abrasion value is less than or equal to 24%, the water absorption rate of the steel slag is less than or equal to 3%, and the RAP is a waste asphalt concrete material obtained by processing an old asphalt pavement through special equipment. The industrial oil is catalytic cracking diesel oil, the epoxy value of the epoxidized soybean oil is 6.8%, the wax crystal dispersing auxiliary agent is microcrystalline wax, the melting point is 100-105 ℃, and the low-temperature flowing agent is ethylene-vinyl acetate copolymer. The antioxidant is an alkylated diphenylamine antioxidant, and the light absorber is an ultraviolet light absorber UV-531. The SBS modifier is a linear SBS modifier, and the stabilizer is dicumyl peroxide. The mineral powder is obtained by grinding limestone, and the passing rate of a sieve pore of 0.075mm is 80-95%. The new asphalt is No. 70 petroleum asphalt or I-D modified asphalt.
Example 4:
1. and (4) grading steel slag and RAP.
a. Placing the steel slag on a screen with the size of 5.2mm, and carrying out vibration screening to obtain steel slag on the screen for later use;
b. and (4) placing the RAP into a 5.2mm screen, vibrating and sieving the RAP, and taking the RAP under the sieve for later use.
2. Preparation of aging-resistant regenerant
a. Mixing industrial oil and epoxidized soybean oil according to the weight ratio of 80: 20, controlling the heating temperature of a water bath to be 80 ℃, and heating and stirring in the water bath for 3 hours to obtain base oil;
b. the wax crystal dispersing aid and the low-temperature flow modifier are mixed according to a ratio of 1:10, the water bath temperature is controlled to be 130 ℃, and the mixture is heated and stirred in a water bath for 1 hour to obtain a compatible aid;
c. mixing the obtained base oil, the compatible auxiliary agent, the alkylation antioxidant, the SBS modifier, the light absorbent and the stabilizer according to the proportion of 100: 20: 0.5: 80: 0.5: 0.5, adding the mixture, shearing for 50min by using a high-speed shearing machine, wherein the rotating speed of the shearing machine is 10000r/min, the shearing temperature is 130 ℃, then preserving heat for 2h in an oven at 130 ℃, and cooling to normal temperature after preserving heat to obtain the anti-aging type regenerant.
3. Design of mix proportion
The steel slag-doped recycled asphalt concrete consists of steel slag, RAP, mineral powder, new asphalt and an aging-resistant type regenerant, and the proportion design process is as follows:
a. steel slag obtained by screeningPlacing in a 10L capacity bucket, and measuring the tamping density rhoF1Is 2.08g.cm3Apparent density of the steel slag is rhoFIs 3.20g.cm3；ρkThe density of the mineral powder is 2.68g.cm3。
b. The RAP obtained in step 1 was placed in a 5L volumetric flask and its tamped density ρ was measuredA1Is 2.18g.cm3Apparent density of RAP is ρAIs 2.5g.cm3；
c. Mass m of steel slagFThe dosage of RAP is 100, the dosage of RAP mA17.6, m of ore powderkThe mass is 7.2;
d. mass m of aging-resistant type recycling agentcIs the amount m of RAPA20% of (a), its mass is 3.52;
e. mass m of the novel bitumenbIs (m)F+mA+mk) Y, the value of the coefficient Y is 0.01, mbIs 1.25
Through the steps, the mass ratio of the steel slag, RAP, mineral powder, new asphalt and the anti-aging type regenerant is determined as follows: 100: 17.6: 7.2:1.25:3.52.
4 mixing of the mixture
a. According to the mass ratio of 100: 17.6: weighing steel slag, RAP, mineral powder, new asphalt and an aging-resistant regenerant according to the proportion of 7.2:1.25:3.52 for later use;
b. heating steel slag to 210 ℃, heating RAP to 120 ℃, and heating new asphalt to 170 ℃;
c. mixing and stirring the steel slag heated to the specified temperature and RAP for 90s, adding new asphalt heated to the specified temperature, stirring for 90s, adding the anti-aging type regenerant, stirring for 90s, finally adding the mineral powder, and stirring for 90s to prepare the steel slag-doped recycled asphalt concrete.
The steel slag is a by-product of steel making, the crushing value of the steel slag is less than or equal to 24%, the los Angeles abrasion value is less than or equal to 24%, the water absorption rate of the steel slag is less than or equal to 3%, and the RAP is a waste asphalt concrete material obtained by processing an old asphalt pavement through special equipment. The industrial oil is catalytic cracking diesel oil, the epoxy value of the epoxidized soybean oil is 6.8%, the wax crystal dispersing auxiliary agent is microcrystalline wax, the melting point is 100-105 ℃, and the low-temperature flowing agent is ethylene-vinyl acetate copolymer. The antioxidant is an alkylated diphenylamine antioxidant, and the light absorber is an ultraviolet light absorber UV-531. The SBS modifier is a linear SBS modifier, and the stabilizer is dicumyl peroxide. The mineral powder is obtained by grinding limestone, and the passing rate of a sieve pore of 0.075mm is 80-95%. The new asphalt is No. 70 petroleum asphalt or I-D modified asphalt.
Table 1 shows the comparison of the performance of the technology with that of common SMA and regenerated SMA, and the result shows that the steel slag-doped regenerated asphalt concrete prepared by the technology has excellent road performance and ageing resistance.
TABLE 1 comparison of the properties of recycled asphalt concrete doped with steel slag
Note: 1. the Marshall stability, dynamic stability, freeze-thaw splitting strength ratio and soaking residual stability ratio in the table are all carried out according to the test procedures of JTGE20-2011 road engineering asphalt and asphalt mixture.
2. The Marshall strength loss rate is obtained by controlling the temperature of all black bodies to be 60 ℃ under a CHF125W-03 type mercury lamp with the wavelength of 365nm, irradiating the black bodies with ultraviolet rays for 72 hours, carrying out a simulated aging experiment, and measuring the Marshall stability after aging.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. The steel slag-doped recycled asphalt concrete is characterized by being prepared from the following raw materials: steel slag, waste asphalt concrete, aging-resistant type recycled concreteRaw agent, mineral powder and new asphalt; the aging-resistant regenerant is prepared from the following raw materials: base oil, compatible auxiliary agent, alkylation antioxidant, SBS modifier, light absorbent and stabilizer; the base oil is prepared from the following raw materials: industrial oils and epoxidized soybean oil; the compatible auxiliary agent is prepared from the following raw materials: wax crystal dispersing assistant and low temperature flow modifier; the steel slag, the waste asphalt concrete, the mineral powder, the new asphalt and the aging-resistant regenerant are in the following mass ratio:
where ρ isF1Is the tamped density of the steel slag, rhoFIs the apparent density of the steel slag, rhoA1Is the tamped density, rho, of the waste asphalt concreteAIs the apparent density, rho, of the waste asphalt concretekThe density of the mineral powder is obtained, and the value of the coefficient Y is 0.01-0.03; the mass ratio of the base oil, the compatible auxiliary agent, the alkylation antioxidant, the SBS modifier, the light absorbent and the stabilizer is 100: (10-20): (0.5-2): (1-80): (0.5-1): (0.1-0.5), wherein the alkylated antioxidant is alkylated diphenylamine antioxidant, the light absorber is ultraviolet light absorber UV-531, the SBS modifier is linear SBS modifier, and the stabilizer is dicumyl peroxide; the mass ratio of the industrial oil to the epoxidized soybean oil is (60-80): (40-20), wherein the industrial oil is catalytic cracking diesel oil, and the epoxy value of the epoxidized soybean oil is 6.8%; the mass ratio of the wax crystal dispersing auxiliary agent to the low-temperature flow modifier is (0.5-1): 10-20), the wax crystal dispersing auxiliary agent is microcrystalline wax, the melting point of the microcrystalline wax is 100-105 ℃, and the low-temperature flow modifier is ethylene-vinyl acetate copolymer.
2. The preparation method of the steel-doped slag recycled asphalt concrete as claimed in claim 1, which is characterized by comprising the following steps:
s100, heating the steel slag to 210 ℃ below zero at 180 ℃, heating the waste asphalt concrete to 120-150 ℃, and heating the new asphalt to 170 ℃ below zero at 160 ℃ for later use;
s200, mixing and stirring the steel slag heated to the specified temperature and the waste asphalt concrete for 60-90 seconds, adding new asphalt heated to the specified temperature, stirring for 60-90 seconds, adding an aging-resistant type regenerant, stirring for 60-90 seconds, finally adding mineral powder, and stirring for 60-90 seconds to obtain the steel slag-doped recycled asphalt concrete.
3. The method according to claim 2, wherein in S200, the steel slag has a crush value of 24% or less, a los Angeles abrasion value of 24% or less, and a water absorption of 3% or less.
4. The preparation method according to claim 2, wherein in the step S200, the specific preparation steps of the base oil are as follows: mixing the industrial oil and the epoxidized soybean oil, controlling the heating temperature of the water bath to be 60-80 ℃, and heating and stirring the mixture for 2-3 hours in the water bath to obtain the base oil.
5. The preparation method according to claim 2, wherein in S200, the specific preparation steps of the compatibility aid are as follows: mixing the wax crystal dispersing aid with the low-temperature flow modifier, controlling the water bath temperature to be 115-130 ℃, and heating and stirring in the water bath for 0.5-1 h to obtain the compatible aid.
6. The method according to claim 2, wherein in S200, the aging-resistant recycling agent is prepared by the following steps: shearing the base oil, the compatilizer, the alkylation antioxidant, the SBS modifier, the light absorbent and the stabilizer by using a high-speed shearing machine, wherein the shearing temperature is 140-160 ℃, then preserving heat for 1-2 h in an oven at the temperature of 120-130 ℃, and cooling to normal temperature after preserving heat to obtain the anti-aging type regenerant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711349397.5A CN108046663B (en) | 2017-12-15 | 2017-12-15 | Steel slag-doped recycled asphalt concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711349397.5A CN108046663B (en) | 2017-12-15 | 2017-12-15 | Steel slag-doped recycled asphalt concrete and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108046663A CN108046663A (en) | 2018-05-18 |
| CN108046663B true CN108046663B (en) | 2020-10-23 |
Family
ID=62133286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711349397.5A Active CN108046663B (en) | 2017-12-15 | 2017-12-15 | Steel slag-doped recycled asphalt concrete and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108046663B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872534A (en) * | 2018-06-16 | 2018-11-23 | 扬州大学 | Sand particles material soil test method |
| CN109721286B (en) * | 2019-01-19 | 2021-06-08 | 江苏盛达飞建筑材料有限公司 | Heat-resistant recycled asphalt concrete and preparation method thereof |
| CN110590221B (en) * | 2019-09-30 | 2021-10-29 | 山西省交通科技研发有限公司 | Environment-friendly recycled asphalt concrete and preparation method thereof |
| FR3107278A1 (en) * | 2020-02-14 | 2021-08-20 | Arkema France | Bituminous composition containing an epoxidized oil |
| CN113563692A (en) * | 2021-06-02 | 2021-10-29 | 长安大学 | Modifier for improving stability of steel slag aggregate and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011027926A1 (en) * | 2009-09-07 | 2011-03-10 | Huh Jung Do | Temperature-adjusted and modified recycled ascon composition for reusing 100% of waste ascon for road pavement, and method for manufacturing same |
| CN104326706A (en) * | 2014-10-15 | 2015-02-04 | 葛映东 | Steel slag asphalt mixed material and preparation method thereof |
| CN105948813A (en) * | 2016-04-28 | 2016-09-21 | 河海大学 | Foamed warm-mix recycled asphalt mixture and preparation method thereof |
-
2017
- 2017-12-15 CN CN201711349397.5A patent/CN108046663B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011027926A1 (en) * | 2009-09-07 | 2011-03-10 | Huh Jung Do | Temperature-adjusted and modified recycled ascon composition for reusing 100% of waste ascon for road pavement, and method for manufacturing same |
| CN104326706A (en) * | 2014-10-15 | 2015-02-04 | 葛映东 | Steel slag asphalt mixed material and preparation method thereof |
| CN105948813A (en) * | 2016-04-28 | 2016-09-21 | 河海大学 | Foamed warm-mix recycled asphalt mixture and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 废旧沥青再生剂的实验研究;余国贤;《石油学报（石油加工）》;20061031;第96-100页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108046663A (en) | 2018-05-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108046663B (en) | Steel slag-doped recycled asphalt concrete and preparation method thereof | |
| KR102020594B1 (en) | Recycled cold asphalt concrete mixture and Construction thereof | |
| CN109650781B (en) | Medium-low temperature warm-mixed high-friction thin-layer overlay asphalt mixture and preparation method thereof | |
| CN109293280A (en) | A kind of bituminous concrete and its preparation process | |
| CN111574133B (en) | Cement-stabilized macadam base material, preparation method thereof and asphalt pavement | |
| CN111056808A (en) | Full-granularity steel slag pavement base material for heavy-load pavement | |
| CN108947328B (en) | Steel slag permeable asphalt mixture based on waste rubber powder modified high-viscosity asphalt | |
| CN115215610B (en) | Steel slag-doped high-performance anti-slip thin-layer overlay asphalt mixture and preparation method thereof | |
| WO2023231618A1 (en) | Method for harmless utilization of oil shale residue and retorted drilling oil residue | |
| CN108585624A (en) | A kind of water-soluble epoxy resin Cold Recycled Mixture with Emulsified Asphalt and preparation method thereof | |
| CN102850020B (en) | High temperature-resistant pavement mortar | |
| CN114538827A (en) | Mixture of polymer composite rubber modified asphalt high-performance steel slag ultrathin wearing layer | |
| Yan et al. | Study on preparation and performance of steel slag asphalt mixture based on steel slag aggregate | |
| CN102795807A (en) | High-definition asphalt pavement waste regeneration technology | |
| CN103864370A (en) | Road material comprising steel slag, waste rubber and casting waste sand as well as preparation and paving method thereof | |
| CN108569878B (en) | Resourceful treatment method for waste powder recovered by asphalt concrete mixing station | |
| CN110540383A (en) | Regenerated asphalt mortar and method for preparing asphalt mixture by using same | |
| CN109704651B (en) | Asphalt mixture and preparation method thereof | |
| CN107902959B (en) | Asphalt loss layer and preparation method and application thereof | |
| CN113718592B (en) | Preparation method of coal indirect liquefied residue asphalt mixture | |
| CN112408862B (en) | Asphalt concrete | |
| CN113622247B (en) | Low-carbon rapid maintenance paving method for asphalt pavement track | |
| CN104278609A (en) | Road pavement material prepared by compounding residue soil and steel slag and method for preparing road pavement material | |
| CN113185199A (en) | Cement stabilizing material and preparation method thereof | |
| CN113511842A (en) | Thermal regeneration steel slag asphalt mixture and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |