WO2011134366A1

WO2011134366A1 - Directly-mixed rubber asphalt mixture and production method thereof

Info

Publication number: WO2011134366A1
Application number: PCT/CN2011/073110
Authority: WO
Inventors: 周其强
Original assignee: Zhou Qiqiang
Priority date: 2010-04-28
Filing date: 2011-04-21
Publication date: 2011-11-03
Also published as: CN101798203B; CN101798203A

Abstract

A rubber asphalt mixture and a preparation method thereof are disclosed. The mixture is prepared with gradation stone, petroleum matrix asphalt and rubber powder modifier in a weight ratio of 89-94:4-6:2-5, wherein the rubber powder modifier consists of rubber power and hexanediol in a weight ratio of 100:3-7. The method comprises the following steps: mixing the hexanediol and the waste tyre powder according to the ratio to obtain the rubber powder modifier by mixing and wetting; heating the mineral aggregates to the temperature of 210 to 220°C, and then adding the rubber powder modifier and the petroleum matrix asphalt into the mineral aggregates at the same time to obtain the mixture after mixing for 40 to 60 seconds. The method is simple and free of pre-mixing the rubber powder and the stone. The transformation from rubber to oil can be implemented, and the petroleum-stone ratio of the mixture can be reduced to 6-8. All technical parameters of the directly-mixed rubber asphalt mixture are higher than those of the industrial standard, and the directly-mixed rubber asphalt mixture can be used for the road construction and water prevention and leakage prevention of roof and tunnels.

Description

Straight mixed rubber asphalt mixture and production method thereof

Technical field

The present invention relates to a method of producing a rubber asphalt mixture and a rubber asphalt mixture produced therefrom.

Background technique

Rubber asphalt is a product obtained by mixing rubber powder and asphalt in a certain ratio, and is a binder used in various types of flexible pavement construction. The mixture of rubber asphalt and mineral material is called rubber asphalt mixture. When it is paved and rolled, it is also called rubber asphalt concrete. At present, the rubber asphalt pavement technology has formed a relatively complete wet process and dry process. The dry process is a method in which rubber powder is added to a mineral material and placed in a mixing plant, and a hot asphalt mixture is added to produce a rubber asphalt mixture. The wet process is a production method in which rubber powder and asphalt are first mixed to form rubber asphalt and then mixed with mineral materials to produce rubber asphalt mixture. Rubber asphalt mixtures are also classified into dry and wet rubber asphalt mixtures, depending on the production process.

Since the wet process first adds the rubber powder to the matrix asphalt and stirs under high temperature conditions, the rubber powder is fully swelled in the matrix asphalt and a relatively complicated material exchange and chemical reaction with the asphalt occurs. On the one hand, the rubber powder is here. Desulfurization and degradation occur during the process, which improves the adhesion of rubber particles. On the other hand, some rubber components enter the asphalt, and the asphalt is modified to improve the adhesion of the asphalt and to strengthen the asphalt. Thus, the wet rubber asphalt mixture exhibits excellent properties of high viscosity and high elasticity. However, the wet process requires special rubber asphalt production equipment, the equipment investment is large, and the wet process is complicated, the process is long, and it needs to react at high temperature for l-4h, and the energy consumption is large. The dry process involves adding rubber particles directly to the aggregate and then spraying it into hot asphalt to form a rubber asphalt mixture. Due to the addition of highly elastic waste rubber particles, the elasticity and damping properties of the road surface can be increased, and the tire/road surface pumping noise and the tire vibration noise can be reduced. The processing method of the rubber particles used in the dry process is simple, the process of mixing the mixture is simple, time-consuming, and does not require expensive rubber asphalt production equipment and energy costs, and is economical and efficient compared with the wet process. However, due to the short preparation time of the dry rubber asphalt mixture, only about 1 minute, the rubber particles in the dry rubber asphalt mixture can not complete the process of desulfurization and degradation, and can not modify the asphalt with material exchange with asphalt. , can only be used as aggregates, The effect on the performance improvement of asphalt pavement is not obvious. Therefore, the performance of the existing dry rubber asphalt mixture is inferior to that of the wet asphalt, especially the water stability is poor, and it is often necessary to add additives such as cement and lime to improve the water stability in the production process. Due to the poor adhesion of the rubber particles and the poor miscibility with the mineral materials, the premixing of the mineral materials and the rubber particles is required, which affects the heat storage of the mixture and limits the paving and rolling time, so that the paving is formed. Rubber asphalt concrete is only suitable for the middle and lower layers of highways due to its low quality. When the dry rubber asphalt mixture is mixed, the rubber asphalt will absorb the equal volume of asphalt, so that the ratio of the mixture to the oil and stone (the mass ratio of the asphalt to the mineral) increases, limiting the amount and quality of the rubber powder modifier, and increasing The cost of the rubber asphalt mixture. At present, the proportion of rubber powder modifier at home and abroad is asphalt: rubber powder modifier = 1: 0.2~0.3, higher than this ratio, paving and rolling can not be formed, the amount of rubber asphalt is 8 of the total weight of the mixture. ~10%.

Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to overcome the above-mentioned shortcomings of the prior art dry rubber asphalt mixture and its production process, and to provide a high-volume dry rubber asphalt mixture and a production method thereof. The rubber asphalt mixing method of the invention has the advantages of simple production method and easy operation, and the rubber powder modifier dosage ratio can be improved by the method, the rubber particle asphaltene can be changed, the “glue oil” can be realized, the amount of the petroleum matrix asphalt can be reduced, and the rubber can be improved. The amount and quality of the powder modifier. The rubber asphalt mixture production method of the invention does not need the premixing process of the traditional dry process, and does not need to add mineral powder, cement, lime lime or blending oil, extended oil and other auxiliary agents, and the rubber asphalt mixture prepared by the technology. The indicators are in line with industry standards and are very economical.

The technical solution of the present invention to achieve the above object of the invention is:

A straight mix rubber asphalt mixture, which is configured according to the following weight ratio components: grading stone: petroleum matrix asphalt: rubber powder modifier = 89~94 _: 4~6: 2~5, the rubber The powder modifier consists of the following weight ratio components: Rubber powder: hexanediol = 100: 3 to 7. The rubber powder is obtained by pulverizing a skewed nylon or a meridian steel waste tire.

A method for producing a straight rubber asphalt mixture, comprising the following steps:

(1) Preparation of rubber powder modifier: hexanediol is blended into rubber powder according to the weight ratio of rubber powder: hexanediol = 100: 3~7, mixed and wetted to obtain rubber powder modifier, rubber powder The modifier is put into the mixing room of the mixing room for use; (2) Preparation of rubber asphalt mixture: The mineral material is heated to 210~220 °C, and the petroleum matrix asphalt is heated to 160~170 °C. According to the polar stone: Asphalt: Rubber powder modifier=89~94 _: 4 ~6: 2~5 weight ratio, adding rubber powder modifier and petroleum matrix asphalt to the mineral material, mixing 40~60s, controlling the mixture discharge temperature to 180~200°C, and obtaining rubber asphalt mixture .

The rubber asphalt mixture of the present invention is configured in the following weight ratio components: Graded stone: Petroleum matrix asphalt: Rubber powder modifier = 89~94 _: 4~6: 2~5, rubber powder modifier from waste Tire powder and hexanediol, hexanediol is a rubber cross-linking agent, the chemical component is 2,5-dimethyl-2,5-hexanediol, English name: 2,5-dimethyl-2,5 -hexanediol, molecular formula

C8H1802, which is white powder or flake, has the function of promoting the low-temperature synthesis of asphaltenes from petroleum asphalt and rubber hydrocarbon molecules, and can increase the permeability of rubber powder modifier. The rubber asphalt mixture of the present invention is prepared by heating the matrix asphalt to

After 160~170 °C, it is added to the heated grading stone at the same time as the rubber powder modifier, and mixed for 40-60 s to obtain rubber asphalt. The method does not need to premix the rubber powder and the stone, and the method is simple. The rubber powder modifier prepared according to the method of the invention has strong permeability, and the rubber particles become rubber oil at high temperature, and some components of the rubber powder enter the asphalt, and asphaltene changes occur, thereby realizing "glue oil" and rubber powder reform. The compatibility of the agent with the ore material is strong, and the rubber powder modifier can penetrate into the stone lattice, thereby increasing the amount of the rubber powder modifier in the rubber asphalt and reducing the amount of the asphalt. The oil to stone ratio of the mix can be reduced from 8-10 to 6-8. The straight rubber asphalt mixture of the invention is evaluated by the Marshall test method and the road performance index, and a plurality of technical indicators are obviously higher than the industry standard, and can be used for waterproofing and leakproof use of road construction and roof tunnels.

detailed description

The present invention will be further described in detail below in conjunction with the specific embodiments. However, the scope of the above-mentioned subject matter of the present invention should not be construed as being limited to the following embodiments, and the technology implemented based on the present invention is within the scope of the present invention.

The rubber pitch in the examples of the present invention was prepared as follows:

Example 1

The straight mix rubber asphalt mixture listed in this embodiment is AC10 grade urban white plus black mixture, and is configured according to the following weight ratio components: Stone material: petroleum matrix asphalt: rubber powder modifier=89: 6: 5 , the rubber powder modifier is as follows Component composition of weight ratio: Waste tire rubber powder: hexanediol = 100: 3.

The straight rubber asphalt mixture of the present embodiment is prepared as follows:

(1) Preparation of rubber powder modifier: hexanediol is blended into rubber powder according to the weight ratio of rubber powder: hexanediol=100:3, and the rubber powder modifier is mixed and wetted to modify the rubber powder. The agent is charged into the mixing room of the mixing room;

(2) Preparation of rubber asphalt mixture: The grading stone is heated to 210~220 °C in the mixing chamber, and the petroleum matrix asphalt is heated to 160~170 °C. According to the matching stone: Asphalt: Rubber powder modifier= 89: 6: 5 weight ratio, through the computer metering control, the rubber powder modifier and the petroleum matrix asphalt are simultaneously sprayed into the mixing chamber and the stone is mixed for 40~60s, that is, the asphalt modification process of the rubber-to-oil is completed, and the control is completed. The mixture discharge temperature was 180 to 200 ° C to obtain a rubber asphalt mixture.

Example 2

The straight mix rubber asphalt mixture enumerated in this embodiment is an AC13-grade pavement layer mixture, and is configured according to the following weight ratio components: Stone material: petroleum base asphalt: rubber powder modifier=92: 5:3, The rubber powder modifier consists of the following weight ratio components: Waste tire rubber powder: hexanediol = 100: 5.

(1) Preparation of rubber powder modifier: hexanediol is blended into rubber powder according to the weight ratio of rubber powder: hexanediol=100:5, mixed and wetted to obtain rubber powder modifier, and rubber powder modified The agent is charged into the mixing room of the mixing room;

(2) Preparation of rubber asphalt mixture: The grading stone is heated to 210~220 °C in the mixing chamber, and the petroleum matrix asphalt is heated to 160~170 °C. According to the matching stone: Asphalt: Rubber powder modifier= 92: 5: 3 weight ratio, through the computer metering control, the rubber powder modifier and the petroleum matrix asphalt are simultaneously sprayed into the mixing chamber and the stone is mixed for 40~60s, that is, the asphalt modification process of the rubber-to-oil is completed, and the control is completed. The mixture discharge temperature was 180 to 200 ° C to obtain a rubber asphalt mixture.

Example 3

The straight rubber asphalt mixture enumerated in this embodiment is an AC16 intermediate layer mixture, and is configured according to the following weight ratio components: Stone: petroleum matrix asphalt: rubber powder modifier = 94: 4: 2, the rubber The powder modifier consists of the following weight ratio components: Waste tire rubber powder: hexanediol = 100: 7. The straight rubber asphalt mixture of the present embodiment is prepared as follows:

(1) Preparation of rubber powder modifier: hexanediol is blended into rubber powder according to the weight ratio of rubber powder: hexanediol=100:7, and the rubber powder modifier is mixed and wetted to modify the rubber powder. The agent is charged into the mixing room of the mixing room;

(2) Preparation of rubber asphalt mixture: The grading stone is heated to 210~220 °C in the mixing chamber, and the petroleum matrix asphalt is heated to 160~170 °C. According to the matching stone: Asphalt: Rubber powder modifier= 94: 4: 2 weight ratio, through the computer metering control, the rubber powder modifier and the petroleum matrix asphalt are simultaneously sprayed into the mixing chamber and mixed with the stone for 40~60s, that is, the asphalt modification process of the rubber-to-oil is completed, and the control is completed. The mixture discharge temperature was 180 to 200 ° C to obtain a rubber asphalt mixture.

The quality of the straight mix rubber mixture of each example was evaluated by the Marshall test method and the road performance index: Marshall test: (surface dry method T0705-2000)

High temperature rutting test

According to the Test Procedure for Asphalt Mixture of Highway Engineering Asphalt and Asphalt Mixture (JTJ052-2000), the high temperature rutting test is carried out according to the relevant technical requirements in the current Technical Specifications for Highway Asphalt Pavement Construction (JTGF40-2004). .

Low temperature trabecular bending test

According to the Bending Test Standard for Asphalt Mixtures in the Test Procedure for Asphalt and Asphalt Mixtures of Highway Engineering (JTJ052-2000) (T0715-1993), the low-temperature trabecular bending test is carried out according to the current Technical Specifications for Construction of Highway Asphalt Pavement (JTGF40-2004). Relevant technical requirements in the evaluation.

Water stability test

According to the test conditions for the freeze-thaw splitting of asphalt mixture in the Test Procedure for Asphalt and Asphalt Mixtures of Highway Engineering (JTJ052-2000), the material is prepared according to the density of the Marshall test piece at the optimum oil-stone ratio of 0.98 times. The method "forms Φ 10 X 10cm cylindrical test piece to ensure the same degree of compaction as the site.

[0020] The test results of the high-volume straight-mixed rubber asphalt mixture prepared by the above three examples are as follows: Table 1, Marshall test results

Table 2, rutting test dynamic stability index test results

Table 3. Test results of bending failure strain index

Table 4, freeze-thaw split test results

Replacement page (Article 26)

Claims

1. A straight mix rubber asphalt mixture characterized in that it is configured in the following weight ratio components: Graded stone: Petroleum matrix asphalt: Rubber powder modifier = 89~94 _: 4~6: 2~ 5. The rubber powder modifier is composed of the following components by weight: rubber powder: hexanediol = 100: 3 to 7.

2. A method of producing a straight rubber asphalt mixture according to claim 1, comprising the steps of:

(1) Preparation of rubber powder modifier: hexanediol is blended into rubber powder according to the weight ratio of rubber powder: hexanediol = 100: 3~7, mixed and wetted to obtain rubber powder modifier, rubber powder The modifier is put into the mixing room of the mixing room for use;

(2) Preparation of rubber asphalt mixture: The mineral material is heated to 210~220 °C, and the petroleum base asphalt is heated to 160~170 °C. According to the polar stone: Asphalt: Rubber powder modifier=89~94 _: 4 ~6: 2~5 weight ratio, adding rubber powder modifier and petroleum matrix asphalt to the mineral material, mixing 40~60s, controlling the mixture discharge temperature to 180~200°C, and obtaining rubber asphalt mixture .