CN112408866B

CN112408866B - High-performance rubber asphalt concrete

Info

Publication number: CN112408866B
Application number: CN202011334103.3A
Authority: CN
Inventors: 董大伟; 江宽; 刘双旺; 董进学; 马庆杰; 颜亮; 武晋巍
Original assignee: Beijng Environmental Protection Technology Co ltd Wing Tai Luther
Current assignee: Beijng Environmental Protection Technology Co ltd Wing Tai Luther
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2022-04-01
Anticipated expiration: 2040-11-24
Also published as: CN112408866A

Abstract

The invention belongs to the technical field of compositions of mortar, concrete or artificial stone of asphalt materials, and discloses high-performance rubber asphalt concrete which comprises rubber asphalt and graded stone, wherein the rubber asphalt comprises petroleum asphalt, rubber powder, SBS, rubber activating agent and stabilizing agent; the preparation method comprises the steps of fully stirring and mixing the prepared rubber asphalt and the graded stone material in a high-temperature environment to form the high-performance rubber asphalt concrete. The rubber powder in the rubber asphalt used in the invention has high adding proportion, the problem of the traditional rubber asphalt with high adding proportion of rubber powder is solved, the prepared high-performance rubber asphalt concrete has excellent comprehensive physical property, has the advantages of more elasticity and strong high-temperature anti-rutting capability (dynamic stability at 60 ℃), and the probability of rutting on the road surface is low.

Description

High-performance rubber asphalt concrete

Technical Field

The invention belongs to the technical field of compositions of mortar, concrete or artificial stone of asphalt materials, and particularly relates to high-performance rubber asphalt concrete.

Background

The asphalt concrete is commonly called as asphalt concrete, and is made up by manually selecting mineral material, broken stone or crushed gravel, stone chip or sand and mineral powder with a certain gradation composition, and mixing them with a certain proportion of road asphalt material under the condition of strict control to obtain the invented mixture. The strength of asphalt concrete is mainly represented by two aspects of the bonding force between asphalt and mineral aggregate and the internal friction and locking force between aggregate particles, and the two aspects are mainly formed by the mass of the asphalt and the cooperation between the mineral aggregate particles. The traditional asphalt mixture adopts petroleum asphalt, and the traffic transportation is developed along with the rapid development of social economy, so that the traffic flow is increased on a plurality of main roads, the pressure on the road surface is increased, and the service life of the road surface paved by the traditional asphalt concrete is reduced.

In order to solve the technical problems, the rubber asphalt concrete is prepared by proportioning and mixing rubber asphalt and mineral aggregate, and the rubber asphalt concrete can improve the durability, the capacity of resisting fatigue cracks on a road surface, the capacity of reflecting cracks, the high-temperature permanent deformation resistance, the low-temperature crack resistance and the noise reduction capacity of the rubber asphalt because the rubber asphalt used as a raw material is doped with a certain proportion of rubber. At present, the addition amount of rubber powder in the rubber asphalt in the industry is generally between 15 and 24 percent, and the doping amount of the rubber powder is continuously increased on the basis of the addition amount of the rubber powder, so that the elasticity, the high-temperature performance and other performances of the rubber asphalt can be continuously improved; however, the high-proportion rubber powder doping amount can cause the high-temperature viscosity of the prepared rubber asphalt to be increased sharply, and then the construction workability of concrete prepared by using the rubber asphalt is influenced, so that the pavement is difficult to compact and the comprehensive physical properties of the pavement are influenced.

In order to continuously improve the comprehensive physical properties of the rubber asphalt while increasing the doping amount of the rubber powder and ensure that the rubber asphalt concrete has enough workability (the high-temperature viscosity is not too high and is generally not more than 4pa. s at 180 ℃), the inventor carries out technical research and development and obtains the high-performance rubber asphalt concrete.

Disclosure of Invention

The invention aims to provide high-performance rubber asphalt concrete to solve the problem that the conventional rubber asphalt concrete has poor comprehensive physical properties and is easy to generate ruts on a road surface.

In order to realize the purpose, the invention provides the following technical scheme that the high-performance rubber asphalt concrete comprises rubber asphalt and graded stone, wherein the rubber asphalt comprises 100 parts of petroleum asphalt, 30-45 parts of rubber powder, 0.5-2 parts of SBS, 0.1-1.5 parts of rubber activating agent and 0.2-0.4 part of stabilizing agent.

The beneficial effects of the technical scheme are as follows:

this technical scheme is through carrying out the ratio to rubber asphalt, can increase each performance of the concrete of preparation, promotes the life on road surface, reduces the probability that the rut appears. According to the rubber asphalt provided by the technical scheme, the rubber powder content is increased in the proportion, so that the elasticity of the prepared rubber asphalt can be improved, and the damage probability is reduced after the formed concrete is paved as a pavement material; meanwhile, the condition that the viscosity is not qualified due to the increase of the content of the rubber powder can be reduced by proportioning the raw materials.

Generally, after the rubber powder doped in the asphalt is increased, the viscosity of the asphalt is not in accordance with the requirement, so that the doping amount of the rubber powder is about 24% at most in the prior art, but the doping amount of the rubber powder in the technical scheme can reach more than 50%, and the viscosity of the rubber powder can meet the standard requirement.

According to the actual operation, it is known that the viscosity of the rubber asphalt at 180 ℃ is drastically increased by adding a large amount of rubber powder. However, through research, the inventor configures the raw materials and the preparation method for preparing the high-performance rubber asphalt, and can control the viscosity of the prepared rubber asphalt at 180 ℃ within a standard range while adding a large amount of rubber powder, so as to greatly improve the performance of the rubber asphalt in all aspects when the rubber asphalt is applied to concrete.

Further, the raw materials comprise, by mass, 100 parts of asphalt, 45 parts of rubber powder, 1 parts of SBS, 1 part of rubber activator and 0.3 part of stabilizer.

Has the advantages that: experiments prove that the rubber asphalt prepared by the raw materials according to the proportion has good effect.

Further, the rubber activator is a rubber activator 420, 450 regenerated rubber activator, 480 regenerated rubber activator, DD (diphenyl disulfide), or allicin.

Has the advantages that: experiments prove that the prepared rubber asphalt has the best effect by using the materials as the rubber activating agent, so that the application effect on concrete is improved.

Further, the stabilizer is sulfur, TMTD (accelerator), DCP (crosslinking agent), accelerator M or rubber accelerator DPTU.

Has the advantages that: experiments prove that the comprehensive physical property is better, and then the comprehensive pavement performance of the rubber asphalt concrete is improved.

Further, the preparation method of the rubber asphalt comprises the following steps,

uniformly mixing rubber powder, a rubber activating agent and a stabilizing agent to obtain a mixture A;

step two, heating the asphalt to 220 ℃ of 210-;

grinding the mixture B at a grinding gap of 0.1-0.6mm to obtain a mixture C;

step four, stirring the mixture C for 1-6h at the temperature of 210-220 ℃, adding the rest mixture A, stirring for 20-45min at the temperature of 500-800rpm to obtain a mixture D;

step five, grinding the mixture D again at a grinding gap of 0.1-0.6mm to obtain a mixture E, and stirring the mixture E at the temperature of 210-220 ℃ for 1-6h to obtain a finished product of the rubber asphalt; the stirring speed is 500-800 rpm.

Has the advantages that: the rubber asphalt prepared by the method can achieve the best effect. And through the configuration of each step, the raw materials can be fully fused, the compatibility is optimal, and the effect of the prepared rubber asphalt is optimal.

Further, the moisture content of the graded stone added to the rubberized asphalt does not exceed 1%.

Has the advantages that: the low water content in the graded stone material can ensure that the prepared rubber asphalt has low water content and is convenient to lay on the road surface.

Further, the preparation method of the high-performance rubber asphalt concrete comprises the step of fully stirring and mixing the prepared rubber asphalt and the graded stone material under a high-temperature environment to form the high-performance rubber asphalt concrete.

Has the advantages that: the rubber asphalt and the graded stone material are mixed and stirred at high temperature, so that the rubber asphalt is in a molten state, and further the full stirring and fusion of the graded stone material and the rubber asphalt can be completed, and the uniformly mixed rubber asphalt concrete is formed.

Further, the asphalt is used as an AC type continuous dense-graded asphalt mixture, an SMA type asphalt mastic structure asphalt mixture and an ARAC type rubber asphalt mixture.

Has the advantages that: the rubber asphalt concrete is applied to AC type continuous dense-graded asphalt mixture, SMA type asphalt mastic structure asphalt mixture and ARAC type rubber asphalt mixture, compared with the existing mixture, the high-doped rubber powder is realized, meanwhile, the comprehensive physical property is ensured to be good, the construction is convenient, and the sufficient easiness is realized.

Drawings

FIG. 1 is a longitudinal sectional view of a high-shear emulsifying machine used in example 11 of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: jar body 1, discharge gate 11, sealed lid 2, feed inlet 21, (mixing) shaft 3, driving gear 31, closing plate 32, stirring vane 33, helical blade 34, drive shaft 4, driven gear 41, ring gear 5, shearing net 6, shearing blade 61.

The high-performance rubber asphalt concrete comprises rubber asphalt and graded stone, wherein the rubber asphalt comprises petroleum asphalt, rubber powder, SBS, rubber activating agent and stabilizing agent; the particle size of the rubber powder is 20-80 meshes, and the rubber powder is rubber particles made of one or more of waste truck tires, sedan tires and bicycle tires; the rubber activator is rubber activator 420, 450 regenerated rubber activator, 480 regenerated rubber activator, DD (diphenyl disulfide) or allicin, preferably allicin; the stabilizer is sulfur, TMTD (accelerator), DCP (crosslinking agent), accelerator M or rubber accelerator DPTU, preferably sulfur.

The high-performance rubber asphalt concrete can be SMA type rubber asphalt concrete, AC type rubber asphalt concrete or ARAC type rubber asphalt mixture. The SMA-13 type rubber asphalt concrete will now be described as an example.

Preparing the high-performance rubber asphalt concrete according to the standard of the SMA-13 type rubber asphalt concrete.

The parameters of the respective raw materials of the rubber asphalt used for the high-performance rubber asphalt concrete are shown in table 1.

TABLE 1

The preparation method of the SMA-13 type high-performance rubber concrete asphalt comprises the following steps:

step one, preparing rubber asphalt, wherein the preparation of the rubber asphalt comprises the following steps:

screening rubber powder with proper particle size, weighing the rubber powder, a rubber activating agent and a stabilizing agent according to the measurement, and putting the rubber powder, the rubber activating agent and the stabilizing agent into high-speed stirring and mixing equipment; starting high-speed stirring and mixing equipment, and fully mixing the rubber powder, the rubber activating agent and the stabilizing agent to obtain a mixture A.

Weighing the asphalt and the SBS according to the measurement, putting the asphalt into a mixing tank, heating the asphalt to 210-220 ℃, adding the mixture A of the weighed SBS and 1/2, and stirring at the temperature of 210-220 ℃ and the stirring speed of 500-800rpm for 20-45min under the heat preservation condition to form a mixture B. The heating temperature and the heat preservation temperature are both 215 ℃, the stirring speed is 650rpm, and the stirring time is 30 min.

And (III) putting the mixture B into a high-speed shearing emulsifying machine, wherein the grinding gap of the high-speed shearing emulsifying machine is 0.1-0.6mm, and the grinding gap of the high-speed shearing emulsifying machine is set to be 0.5 mm. And starting the high-speed shearing emulsifying machine to finish fully grinding the mixture B and form a mixture C.

Fourthly, the mixture C is put into the mixing tank again, and is stirred for 1 to 6 hours at the temperature of 210 ℃ and 220 ℃ and the heat preservation speed of 500 rpm and 800 rpm; then adding the rest mixture A, and stirring at the temperature of 210 ℃ and 220 ℃ at the speed of 500 rpm and 800rpm for 20-45min to obtain a mixture D. In the step, the heat preservation temperature is 215 ℃, the stirring speed is 650rpm, the first stirring time is 5 hours, and the second stirring time is 30 minutes.

And (V) putting the mixture D into a high-speed shearing emulsifying machine, and setting the grinding gap of the high-speed shearing emulsifying machine to be 0.4 mm. And starting the high-speed shearing emulsifying machine, and fully grinding the mixture D to obtain a mixture E. And then the mixture E is put into a mixing tank and stirred for 1-6h at the temperature of 210-220 ℃ and the heat preservation speed of 800rpm at 500-800 ℃ to prepare the high-performance rubber asphalt finished product. In the step, the heat preservation temperature is 215 ℃, the stirring speed is 650rpm, and the stirring time is 6 hours.

Step two, weighing the rubber asphalt and the graded stone according to the measurement, respectively putting the rubber asphalt and the graded stone into two mixing tanks, heating the rubber asphalt while stirring the rubber asphalt until the rubber asphalt is heated to 175-; and heating and stirring the graded stone material until the graded stone material is heated to 180-200 ℃ and the water content is lower than 1%, preferably 190 ℃.

And step three, putting the heated rubber asphalt into the heated graded stone according to a proportion, and stirring the heated graded stone at a temperature of 180 ℃ to realize the stirring of the materials and form the high-performance rubber asphalt concrete.

Examples 1 to 10 differ only in the rubber asphalts used, the parameters indicated in Table 1.

Example 11:

example 11 differs from example 10 only in that, as shown in fig. 1, the high-speed shearing emulsifying machine used in this example includes a tank 1, a heating passage is provided on an outer wall of the tank 1, and a heat source is communicated with the heating passage (for example, water, oil, liquid metal, etc. are introduced into the heating passage). The top of the jar body 1 is provided with the sealed lid 2, is equipped with feed inlet 21 on the sealed lid 2, and the bottom of the jar body 1 is equipped with discharge gate 11. The feed inlet 21 is provided with a sealing plug, and the discharge outlet 11 is internally provided with a discharge valve.

A motor is fixed on the inner side of the sealing cover body 2, a stirring shaft 3 is coaxially fixed on a driving shaft 4 of the motor, and a driving gear 31 is coaxially fixed on the stirring shaft 3; the sealed cover body 2 is also rotatably connected with a driving shaft 4, and a driven gear 41 meshed with the driving gear 31 is coaxially fixed on the driving shaft 4. The inner wall of the tank body 1 is rotatably connected with an inner gear ring 5, the inner gear ring 5 is coaxially arranged with the tank body 1, and the inner gear ring 5 is meshed with the driven gear 41.

The bottom of ring gear 5 is fixed with shearing net 6, is provided with polylith shearing blade 61 on the outer wall of shearing net 6, all is equipped with a plurality of through-holes on shearing net 6 and the shearing blade 61. The number of the shearing blades 61 is set according to actual requirements, and the number of the shearing blades 61 is 4 in the embodiment and is uniformly distributed on the outer side of the shearing net 6. The shearing blades 61 are pressed against the inner wall of the can body 1.

A sealing plate 32 which is pressed against the inner wall of the shearing net 6 is coaxially fixed on the stirring shaft 3. The bottom of (mixing) shaft 3 is fixed with helical blade 34, is located on the (mixing) shaft 3 and is equipped with stirring vane 33 between helical blade 34 and closing plate 32, and stirring vane 33 is provided with the polylith, is provided with 3 in this embodiment, and the distance between one side that stirring vane 33 kept away from (mixing) shaft 3 and the shearing net 6 inner wall is 0-5mm, and 3mm is chooseed for use in this embodiment.

When the material feeding device is used, raw materials are fed into the tank body 1 through the feeding hole 21, and then the feeding hole 21 is sealed. Starting a motor, driving the stirring shaft 3 to rotate by the motor, further realizing the rotation of the driving gear 31, driving the shearing net 6 to rotate by the inner gear ring 5 through the transmission of the driven gear 41, and the rotation direction of the shearing net 6 is opposite to that of the stirring shaft 3.

When the stirring shaft 3 rotates, the helical blade 34 rotates, and by providing the shearing net 6, a relatively sealed state is formed between the stirring shaft 3 and the helical blade 34, so that the helical blade 34 can transfer the raw material at the bottom upward and shear by the rotation of the stirring blade 33. Simultaneously, be provided with the through-hole on the shearing net 6 to cooperation helical blade 34 lasts upwards transmits the raw materials, can make the raw materials from the through-hole in the space that shearing net 6 constitutes of allotting, at this in-process, can carry out better shearing to the raw materials.

When shearing 6 rotations in the net, can drive shearing blade 61 and rotate, can shear the raw materials in the outside to through-hole on shearing blade 61 can provide great shearing force for the raw materials, improves the effect of cuting, thereby makes raw materials (pitch) can reach better homogenization, the effect of melting. Meanwhile, the shearing blade 61 can move relative to the inner wall of the tank body 1, so that raw materials adhered to the inner wall of the tank body 1 are scraped, and the raw materials are prevented from aging. In the process, the position exchange of the raw materials at the upper part and the lower part can be realized, and the homogenization and melting effects among the raw materials are further improved.

Experiment:

three sets of comparative examples were provided, different from the rubber asphalts provided in examples 1-10, and the parameters of the comparative examples are shown in Table 2.

TABLE 2

Comparative example	Asphalt	Rubber powder	SBS	Rubber activator	Stabilizer
							1	100	35	1	2	0.3
2	100	35	1	0	0.3
						3	100	35	0	1.5	0

The rubber asphalts provided in examples 1 to 11 and comparative examples 1 to 3 were tested using JTG F40-2004 "technical Specification for construction of road asphalt pavement" as a test reference, and data shown in Table 3 were obtained.

TABLE 3

	Viscosity at 180 ℃	Softening point	Penetration at 25 ℃	Ductility at 5 DEG C	Difference of softening point for 48h
						Unit of	Pa.s	℃	0.1mm	cm	℃
Standard of merit	≤5	≥45	≥30	≥10	≤5
						Example 1	1.85	72	46	18	3.9
Example 2	2.2	76	44	16	2.2
						Example 3	2.8	79	43	15	2.1
Example 4	3.0	82	40	13	1.8
						Example 5	2.0	72	47	12	2.9
Example 6	3.0	85	41	21	1.4
						Example 7	3.3	81	41	11	2.5
Example 8	1.2	66	51	24	1.8
						Example 9	2.4	70	46	12	3.3
Example 10	1.8	79	41	18	2.0
						Example 11	1.65	75	48	21	2.1
Comparative example 1	0.7	58	58	27	5.8
						Comparative example 2	7.5	79	36	9	3.3
Comparative example 3	1.2	63	51	6	＞10

The SMA-13 type high-performance rubber asphalt concrete prepared in examples 1 to 11 and comparative examples 1 to 3 was tested according to JTG F40-2004 "technical Specification for construction of asphalt road pavement for road", and data of some examples are shown in Table 4.

TABLE 4

In conclusion, after a large amount of rubber powder is added into the high-performance rubber asphalt concrete provided by the invention, the performances are greatly improved, and the viscosity at 180 ℃ can meet the standard requirement.

It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and these changes and modifications should not be construed as affecting the performance of the invention and its practical application.

Claims

1. The high-performance rubber asphalt concrete is characterized in that: comprises rubber asphalt and graded stone, wherein the rubber asphalt comprises 100 parts of petroleum asphalt, 30-45 parts of rubber powder, 0.5-2 parts of SBS, 0.1-1.5 parts of rubber activator and 0.2-0.4 part of stabilizer;

the preparation method of the rubber asphalt comprises the following steps,

step two, heating the asphalt to 220 ℃ of 210-;

grinding the mixture B at a grinding gap of 0.1-0.6mm to obtain a mixture C;

2. The high-performance rubber asphalt concrete according to claim 1, wherein: the rubber asphalt comprises, by mass, 100 parts of asphalt, 45 parts of rubber powder, 1 parts of SBS, 1 part of rubber activator and 0.3 part of stabilizer.

3. The high-performance rubber asphalt concrete according to claim 2, wherein: the rubber activator is rubber activator 420, 450 regenerated rubber activator, 480 regenerated rubber activator or allicin.

4. The high-performance rubber asphalt concrete according to claim 3, wherein: the stabilizer is sulfur.

5. The high-performance rubber asphalt concrete according to claim 1, wherein: the water content of the graded stone added into the rubber asphalt is not more than 1 percent.

6. The high-performance rubber asphalt concrete according to claim 5, wherein: the preparation method of the high-performance rubber asphalt concrete comprises the steps of fully stirring and mixing the prepared rubber asphalt and the graded stone material in a high-temperature environment to form the high-performance rubber asphalt concrete.

7. The high-performance rubber asphalt concrete according to claim 6, wherein: the asphalt is used as AC type continuous close-graded structure asphalt mixture, SMA type asphalt mastic structure asphalt mixture, and ARAC type rubber asphalt mixture.