阅读说明：本技术 一种高透水再生sma沥青混合料生产方法 (Production method of high-water-permeability regenerated SMA asphalt mixture ) 是由 王仁璇 于 2020-07-02 设计创作，主要内容包括：本发明公开一种高透水再生SMA沥青混合料生产方法,包括以下步骤：准备材料、制备改性沥青、制备改性沥青混合料、制备纤维骨料、沥青旧料处理、制备增强型再生旧料、得到半成品和得到成品；本发明以粗骨料为主制备沥青混合料,选用质地坚硬、表面粗糙、形状接近立方体的玄武岩碎石,内部具有大空隙间断的结构,便于透水,配合抗剥落剂、增强剂和木质素纤维,提高沥青的粘附性和韧性,即使存在空隙也不会开裂,在透水的同时保证耐久性和稳定性,同时,本发明添加了疏水剂,在透水的同时具有抗水、疏水、憎水的性能,避免水分残留,进一步优化了透水性能,另外,本发明利用沥青旧料和回收粉作为原料的一部分,节约资源,降低了制备成本。(The invention discloses a production method of a high-permeability regenerated SMA asphalt mixture, which comprises the following steps: preparing materials, preparing modified asphalt, preparing a modified asphalt mixture, preparing fiber aggregate, treating an old asphalt material, preparing an enhanced regenerated old material, obtaining a semi-finished product and obtaining a finished product; the invention takes the coarse aggregate as the main material to prepare the asphalt mixture, selects the basalt macadam with hard texture, rough surface and approximate cubic shape, has a large-gap discontinuous structure in the interior, is convenient for water permeation, is matched with the anti-stripping agent, the reinforcing agent and the lignin fiber, improves the adhesiveness and the toughness of the asphalt, can not crack even if gaps exist, ensures the durability and the stability while permeating water, simultaneously adds the hydrophobic agent, has the water resistance, hydrophobicity and hydrophobicity while permeating water, avoids water residue, further optimizes the water permeation performance, in addition, the invention utilizes the old asphalt material and the recycled powder as one part of the raw materials, saves resources and reduces the preparation cost.)

1. The production method of the high-permeability regenerated SMA asphalt mixture is characterized by comprising the following steps of:

the method comprises the following steps: preparing the material

Preparing materials according to the mass ratio: 5-15 parts of new asphalt, 15-25 parts of old asphalt, 20-30 parts of fine aggregate, 70-80 parts of coarse aggregate, 8-12 parts of limestone mineral powder, 5-8 parts of recycled powder, 3-6 parts of regenerant, 1-3 parts of modifier, 0.2-0.5 part of anti-stripping agent, 1-3 parts of reinforcing agent, 0.1-0.3 part of hydrophobic agent, 2-7 parts of warm mixing agent, 0.3-0.8 part of lignin fiber, 1-3 parts of lubricant and 0.5-2 parts of antioxidant;

step two: preparation of modified asphalt

Putting the new asphalt into a stirring cylinder, stirring, simultaneously heating to 175 ℃ under 170 ℃ and 140 ℃, adding the modifier and the warm-mixing agent into the stirring cylinder, mixing and stirring at 140 ℃ so that the modifier and the warm-mixing agent are uniformly mixed with the new asphalt, heating to 170 ℃ under 160 ℃ and stirring for 2-3min, cooling to 100 ℃, mixing for 6-7min, and pouring out the mixture to obtain modified asphalt;

step three: preparation of modified asphalt mixture

Adding limestone mineral powder into the modified asphalt, heating to the temperature of 200-220 ℃, simultaneously performing dry mixing, stopping heating after the limestone mineral powder and the modified asphalt are softened and melted, and stopping stirring when the temperature is reduced to the temperature of 170-180 ℃ to obtain a modified asphalt mixture;

step four: preparation of fiber aggregate

Adding the fine aggregate and the coarse aggregate into a stirring kettle, stirring for 90s at a cold state to prepare mixed aggregate, then adding the lignin fiber into the stirring kettle, and performing dry stirring to ensure that the broken fiber and the mixed aggregate are uniformly stirred to obtain fiber aggregate;

step five: old asphalt material treatment

Cleaning and inspecting the old asphalt material, screening out dust and clay, then putting the screened recycled asphalt treated material into a crusher for crushing, then performing extraction measurement on the old asphalt material, heating the old asphalt material to 150-165 ℃ when the penetration of the extracted old asphalt material is less than 35mm at 25 ℃ and the viscosity is more than 1000Pa.S at 60 ℃, adding a regenerant into the old asphalt material, and stirring for 20 min;

step six: preparing enhanced regenerated used material

Adding the recovery powder into the old asphalt material treated in the step five, heating to 190 ℃ for 180-;

step seven: obtaining a semi-finished product

Putting the fiber aggregate obtained in the step four into a stirring cylinder, preheating, starting stirring, pouring the modified asphalt mixture obtained in the step three into the stirring cylinder, waiting for 8s, pouring the enhanced regenerated old material obtained in the step six into the stirring cylinder after the raw materials in the stirring cylinder are primarily mixed, increasing the temperature to 160-class sand-adding 180 ℃, continuing stirring for 66s, and stirring the mixture for 147t of yield per hour to obtain a semi-finished product;

step eight: obtaining the finished product

And (3) reducing the temperature of the semi-finished product to 130 ℃ below 120-.

2. The production method of the high-permeability recycled SMA asphalt mixture according to claim 1, characterized by comprising the following steps: in the first step, the coarse aggregate is selected from basalt broken stone which is hard in texture, rough in surface and approximately cubic in shape, and the particle size specification is l0-15 mm; fine aggregate is limestone machine-made sand, and the particle size specification is 1-3 mm; the old asphalt material and the recovered powder are both taken from waste asphalt and waste mineral powder in the SMA asphalt pavement milling material.

3. The production method of the high-permeability recycled SMA asphalt mixture according to claim 1, characterized by comprising the following steps: in the first step, the regenerant is a mixture of furfural oil and corn oil, the warm-mixing agent is APTL/01, and the modifier is a mixture of a styrene-butadiene-styrene triblock copolymer, petroleum resin, aromatic oil, ground diatomite baked product and an auxiliary agent.

4. The production method of the high-permeability recycled SMA asphalt mixture according to claim 1, characterized by comprising the following steps: in the fourth step, the specific process for adding the lignin fiber comprises the following steps: manually putting the lignin fibers into fiber adding equipment, mechanically smashing the fibers, and blowing the smashed fibers into a stirring kettle by using an air compressor for dry mixing.

5. The production method of the high-permeability recycled SMA asphalt mixture according to claim 1, characterized by comprising the following steps: and in the fifth step, when the penetration degree and the viscosity of the old asphalt material meet the standard, no regenerant is added.

6. The production method of the high-permeability recycled SMA asphalt mixture according to claim 1, characterized by comprising the following steps: and step seven, putting the fiber aggregate into a stirring cylinder, and preheating for 2min at the temperature of 120-.

7. The production method of the high-permeability recycled SMA asphalt mixture according to claim 1, characterized by comprising the following steps: and step eight, adding the anti-stripping agent into the semi-finished product, and uniformly permeating the anti-stripping agent by using a forced stirring method.

Technical Field

The invention relates to the technical field of asphalt manufacturing, in particular to a production method of a high-permeability recycled SMA asphalt mixture.

Background

The asphalt mastic crushed Stone Mixture (SMA) is an asphalt mastic crushed stone mixture, which is an integrated asphalt mixture formed by filling asphalt mastic consisting of an asphalt binder, a small amount of fiber stabilizer, fine aggregate and a large amount of filler (mineral powder) into gaps of a coarse aggregate framework with discontinuous gradation, and originates from Germany in the 60 th of the 20 th century;

the existing SMA asphalt mixture generally adopts a new asphalt binder and a new mineral aggregate, so that the cost cannot be saved, the renewable resources cannot be utilized, the environmental protection sustainable idea cannot be met, and the existing SMA asphalt mixture has poor water permeability and water is easy to deposit on the surface after pavement is paved.

Disclosure of Invention

Aiming at the problems, the invention aims to provide a method for producing a high-permeability recycled SMA asphalt mixture, which is characterized in that a coarse aggregate is mainly used for preparing the asphalt mixture, basalt macadam which is hard in texture, rough in surface and close to a cube in shape is selected, a large-gap discontinuous structure is arranged inside the basalt macadam, the water permeability is facilitated, an anti-stripping agent, a reinforcing agent and lignin fibers are matched, the adhesion and the toughness of asphalt are improved, cracking is avoided even if gaps exist, and the durability and the stability are ensured while the water permeability is realized.

In order to realize the purpose of the invention, the invention is realized by the following technical scheme: a production method of a high-permeability regenerated SMA asphalt mixture comprises the following steps:

the method comprises the following steps: preparing the material

Preparing materials according to the mass ratio: 5-15 parts of new asphalt, 15-25 parts of old asphalt, 20-30 parts of fine aggregate, 70-80 parts of coarse aggregate, 8-12 parts of limestone mineral powder, 5-8 parts of recycled powder, 3-6 parts of regenerant, 1-3 parts of modifier, 0.2-0.5 part of anti-stripping agent, 1-3 parts of reinforcing agent, 0.1-0.3 part of hydrophobic agent, 2-7 parts of warm mixing agent, 0.3-0.8 part of lignin fiber, 1-3 parts of lubricant and 0.5-2 parts of antioxidant;

step two: preparation of modified asphalt

Putting the new asphalt into a stirring cylinder, stirring, simultaneously heating to 175 ℃ under 170 ℃ and 140 ℃, adding the modifier and the warm-mixing agent into the stirring cylinder, mixing and stirring at 140 ℃ so that the modifier and the warm-mixing agent are uniformly mixed with the new asphalt, heating to 170 ℃ under 160 ℃ and stirring for 2-3min, cooling to 100 ℃, mixing for 6-7min, and pouring out the mixture to obtain modified asphalt;

step three: preparation of modified asphalt mixture

Adding limestone mineral powder into the modified asphalt, heating to the temperature of 200-220 ℃, simultaneously performing dry mixing, stopping heating after the limestone mineral powder and the modified asphalt are softened and melted, and stopping stirring when the temperature is reduced to the temperature of 170-180 ℃ to obtain a modified asphalt mixture;

step four: preparation of fiber aggregate

Adding the fine aggregate and the coarse aggregate into a stirring kettle, stirring for 90s at a cold state to prepare mixed aggregate, then adding the lignin fiber into the stirring kettle, and performing dry stirring to ensure that the broken fiber and the mixed aggregate are uniformly stirred to obtain fiber aggregate;

step five: old asphalt material treatment

Cleaning and inspecting the old asphalt material, screening out dust and clay, then putting the screened recycled asphalt treated material into a crusher for crushing, then performing extraction measurement on the old asphalt material, heating the old asphalt material to 150-165 ℃ when the penetration of the extracted old asphalt material is less than 35mm at 25 ℃ and the viscosity is more than 1000Pa.S at 60 ℃, adding a regenerant into the old asphalt material, and stirring for 20 min;

step six: preparing enhanced regenerated used material

Adding the recovery powder into the old asphalt material treated in the step five, heating to 190 ℃ for 180-;

step seven: obtaining a semi-finished product

Putting the fiber aggregate obtained in the step four into a stirring cylinder, preheating, starting stirring, pouring the modified asphalt mixture obtained in the step three into the stirring cylinder, waiting for 8s, pouring the enhanced regenerated old material obtained in the step six into the stirring cylinder after the raw materials in the stirring cylinder are primarily mixed, increasing the temperature to 160-class sand-adding 180 ℃, continuing stirring for 66s, and stirring the mixture for 147t of yield per hour to obtain a semi-finished product;

step eight: obtaining the finished product

And (3) reducing the temperature of the semi-finished product to 130 ℃ below 120-.

The further improvement lies in that: in the first step, the coarse aggregate is selected from basalt broken stone which is hard in texture, rough in surface and approximately cubic in shape, and the particle size specification is l0-15 mm; fine aggregate is limestone machine-made sand, and the particle size specification is 1-3 mm; the old asphalt material and the recovered powder are both taken from waste asphalt and waste mineral powder in the SMA asphalt pavement milling material.

The further improvement lies in that: in the first step, the regenerant is a mixture of furfural oil and corn oil, the warm-mixing agent is APTL/01, and the modifier is a mixture of a styrene-butadiene-styrene triblock copolymer, petroleum resin, aromatic oil, ground diatomite baked product and an auxiliary agent.

The further improvement lies in that: in the fourth step, the specific process for adding the lignin fiber comprises the following steps: manually putting the lignin fibers into fiber adding equipment, mechanically smashing the fibers, and blowing the smashed fibers into a stirring kettle by using an air compressor for dry mixing.

The further improvement lies in that: and in the fifth step, when the penetration degree and the viscosity of the old asphalt material meet the standard, no regenerant is added.

The further improvement lies in that: and step seven, putting the fiber aggregate into a stirring cylinder, and preheating for 2min at the temperature of 120-.

The further improvement lies in that: and step eight, adding the anti-stripping agent into the semi-finished product, and uniformly permeating the anti-stripping agent by using a forced stirring method.

The invention has the beneficial effects that: the invention takes coarse aggregate as main material to prepare asphalt mixture, selects basalt macadam with hard texture, rough surface and approximate cubic shape, has a structure with large gaps and discontinuity inside, is convenient for water permeation, is matched with anti-stripping agent, reinforcing agent and lignin fiber, improves the adhesiveness and toughness of asphalt, can not crack even if gaps exist, ensures durability and stability while permeating water, simultaneously adds hydrophobic agent, has water resistance, hydrophobicity and hydrophobicity while permeating water, avoids water residue, further optimizes the water permeation performance, in addition, the invention utilizes the old asphalt material and the recycled powder as part of raw materials, and the old asphalt material and the recycled powder are both taken from waste asphalt and waste mineral powder in SMA asphalt pavement milling material, and are recycled after being regenerated by the regenerating agent, thereby saving resources and reducing preparation cost.

Drawings

FIG. 1 is a flow chart of the present invention.

Detailed Description

In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.