KR20130078996A - Reinforcing fiber and asphalt composition using the same - Google Patents

Reinforcing fiber and asphalt composition using the same Download PDF

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Publication number
KR20130078996A
KR20130078996A KR1020120000203A KR20120000203A KR20130078996A KR 20130078996 A KR20130078996 A KR 20130078996A KR 1020120000203 A KR1020120000203 A KR 1020120000203A KR 20120000203 A KR20120000203 A KR 20120000203A KR 20130078996 A KR20130078996 A KR 20130078996A
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South Korea
Prior art keywords
reinforcing fiber
aggregate
asphalt mixture
fiber
fiber reinforced
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KR1020120000203A
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Korean (ko)
Inventor
윤태영
유평준
엄병식
최지영
함상민
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한국건설기술연구원
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Priority to KR1020120000203A priority Critical patent/KR20130078996A/en
Publication of KR20130078996A publication Critical patent/KR20130078996A/en

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    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C11/00—Details of pavings
    • E01C11/16—Reinforcements
    • E01C11/165—Reinforcements particularly for bituminous or rubber- or plastic-bound pavings
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C2201/00—Paving elements
    • E01C2201/16—Elements joined together
    • E01C2201/167—Elements joined together by reinforcement or mesh

Abstract

PURPOSE: A reinforcing fiber and an asphalt composition using the same are provided to effectively reduce fatigue cracks, plastic deformation, and the damage of a port hole in an asphalt pavement due to various vehicle loads and environmental loads. CONSTITUTION: A reinforcing fiber (100) comprises a linear main body (110) and a reinforcing part (120). The reinforcing part is formed at both ends of the main body. The diameter of the reinforcing part is bigger than the diameter of the main body.

Description

Reinforcement Fiber and Fiber-Reinforced Asphalt Mixture Using It {REINFORCING FIBER AND ASPHALT COMPOSITION USING THE SAME}

The present invention relates to the field of civil engineering, and in particular, to reinforcing fibers and asphalt mixtures using the same.

Asphalt road pavement is generally composed of a roadbed 10, an auxiliary base layer 20 by compaction of aggregate, an asphalt base layer 30, and a surface layer 40 (FIG. 1).

When the asphalt base layer 30 is composed of two layers, the lower layer becomes the base layer 31 and the upper layer becomes the intermediate layer 32 (FIG. 2).

As road pavement is a member that is directly exposed to the vehicle load and various environmental conditions (freeze thaw, rain and ice melt) during the public period, various defects and damages frequently occur.

Representative failure forms that occur in asphalt pavement include rutting due to plastic deformation (FIG. 3A), fatigue cracks (FIG. 3B), and port holes (FIG. 3C).

Figure 4 shows the results of stress concentration analysis distributed inside the general package cross-section due to the external traffic load action, such failure is due to the repeated external load as shown in Figure 4 due to the repeated portion of the upper part of the package (usually the lowermost top layer) As the stress is excessively concentrated at 5 to 7 cm or 2 to 3 cm from the top, it progresses from that point and becomes outward.

Until now, various studies have been made to extend the service life of asphalt pavement, and representative methods include using chemical modifiers and lattice type geotextiles and straight polymer fibers.

The chemical modifier is a method of increasing the viscosity of an asphalt binder by melting petroleum (SBS: Styrene Butadiene Styrene or SBR: Styrene Butadiene Rubber) polymer particles in an asphalt binder.

Although this method has a beneficial effect on plastic deformation, it is difficult in practical application due to excessive cost, difficulty in quality control, increase of energy cost due to increase of mixture production temperature, and possibility of cracking due to brittleness of material at low temperature. have.

The method of using a grid-like geotextile is a method of laminating a geotextile woven in a grid form in the middle.

This method has the effect of reducing the reflection cracks transferred from the lower layer to the upper layer, but the construction process is complicated, the construction period is long, and the construction cost increases. In addition, the method of using a grid-like geotextile has a disadvantage that does not have adequate resistance to the largest concentrated stress or shear deformation occurs in the surface layer.

In case of straight polymer fiber, it is sometimes used in the asphalt mixture to reinforce the area where the greatest concentrated stress or shear deformation occurs inside the surface layer, but it is not effective because the bond performance between the straight polymer fiber and asphalt binder and aggregate is not stable. Toughness is difficult to reinforce.

The present invention was derived to solve the above problems, and effectively reduce fatigue cracking, plastic deformation and port hole damage caused by various vehicle loads and environmental loads on asphalt road pavement, and have economical and excellent physical properties. It is an object to provide a reinforcing fiber and a fiber reinforced asphalt mixture using the same.

In order to solve the above problems, the present invention is a linear structure main body 110; The reinforcement fiber 100 including; a reinforcement portion 120 formed to have a larger diameter than the diameter of the main body 110 on both ends of the main body 110.

The reinforcement portion 120 is preferably a spherical structure.

The longitudinal section of the reinforcement portion 120 is preferably a structure in which the diameter gradually increases toward the outside.

The longitudinal section of the reinforcement portion 120 is preferably a triangular structure.

It is preferable that the cross section of the reinforcement part 120 has a circular structure.

The body 110 and the reinforcing part 120 is preferably formed integrally with a thermoplastic synthetic resin material.

The body 110 and the reinforcement portion 120 is preferably formed of a material containing a thermoplastic nylon 6 resin.

Preferably, the thermoplastic nylon 6 resin has a melting point of 200 to 230 ° C., a tensile strength of 500 to 800 kgf / cm 2, a tensile elongation of 50 to 60%, an elastic modulus of 20,000 to 25,000 kgf / cm 2, and a specific gravity of 1.1 to 1.2. .

The present invention is the reinforcing fiber 100; Asphalt binder having a penetration of 60 to 90; It also presents a fiber reinforced asphalt mixture, characterized in that it comprises an aggregate.

To be used for the surface layer, the coarse aggregate maximum dimension of the aggregate is 13mm, the length of the reinforcing fiber 100 is preferably 5 ~ 15mm.

The reinforcing fiber 100 is preferably 0.05 to 0.15 parts by weight compared to the total.

It is preferable that the aggregate has a passage ratio of 40 to 55% by weight.

To be used in the intermediate layer, the coarse aggregate maximum dimension of the aggregate is 19mm, the length of the reinforcing fiber 100 is preferably 15-25mm.

The reinforcing fiber 100 is preferably 0.15 ~ 0.25 parts by weight compared to the total.

It is preferable that the aggregate is 25-35% by weight of the eighth passage.

To be used in the base layer, the coarse aggregate maximum dimension of the aggregate is 25mm, the length of the reinforcing fiber 100 is preferably 25 ~ 35mm.

The reinforcing fiber 100 is preferably mixed 0.3 to 0.4 parts by weight relative to the total.

It is preferable that the aggregate is 25-35% by weight of the eighth passage.

The present invention provides a method for producing the fiber reinforced asphalt mixture, the dry bibim step of mixing the aggregate and the reinforcing fiber 100 in a dry state; It proposes together a method for producing a fiber reinforced asphalt mixture comprising a; and a wet bibeam step of adding the asphalt binder to the mixed aggregate and reinforcing fibers 100 and mixing while heating.

The dry bibim step is preferably performed for 10 to 20 seconds, and the wet bibim step is preferably performed for 20 to 30 seconds.

The present invention effectively reduces fatigue cracking, plastic deformation, and port hole breakage caused by various vehicle loads and environmental loads on asphalt road pavement, and provides reinforcing fibers and fiber-reinforced asphalt mixtures having the same physical properties. .

1,2 is a cross-sectional view of the asphalt pavement structure.
Figure 3 is a photograph of the broken form of the asphalt pavement structure.
4 is a schematic diagram of the stress distribution of the asphalt pavement structure.
5 is for explaining the embodiment of the present invention,
5 is a sectional view of a first embodiment of a reinforcing fiber.
6 is a sectional view of a second embodiment of a reinforcing fiber.
7 is a perspective view of a third embodiment of a reinforcing fiber.
8, 9 is a particle size distribution curve and a schematic diagram of the aggregate.
10 is a block diagram of an asphalt mixture production plan.
11 is a block diagram of an indoor mixture design of asphalt mixture.
12 is a graph of fatigue properties of asphalt mixtures.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figure 5, the reinforcing fiber 100 according to the present invention basically, the main body 110 of the straight structure; It takes a structure in the form of a dumbbell comprising a; reinforcing portion 120 formed to have a larger diameter than the diameter of the main body 110 on both ends of the main body 110.

The diameter of the main body 110 is 1 ~ 2mm, the diameter of the reinforcement portion 120 is suitable 2 ~ 4mm or so.

The reinforcement part 120 formed at both ends of the reinforcing fiber 100 according to the present invention serves to improve the bonding strength of the asphalt binder and the fiber and the engagement strength of the aggregate.

The reinforcement part 120 may have a spherical shape, a polyhedron shape, or any other structure as long as the reinforcement part 120 has a diameter larger than that of the main body 110.

The reinforcement part 120 of the spherical structure has an advantage that it is easy to manufacture by injection molding.

When the longitudinal section of the reinforcement portion 120 has a structure in which the diameter gradually increases toward the outside, there is an advantage of further increasing the above-described engagement strength.

To this end, it is preferable that the longitudinal section of the reinforcement part 120 has a triangular structure, and it is more preferable in terms of structural stability and ease of manufacture that the conical structure is taken as a whole by the cross section of the reinforcement part 120 taking a circular structure. desirable.

The main body 110 and the reinforcing part 120 of the reinforcing fiber 100 are preferably integrally formed by a thermoplastic synthetic resin material, and specifically, the reinforcing fiber 100 may be formed of a material including a thermoplastic nylon 6 resin.

It is not only excellent in strength but also has a melting point of 200 ~ 230 ℃, it is possible to maintain the shape without twisting or bowling (Balling) at a high temperature of 180 ~ 190 ℃ occurring during the manufacture and construction of asphalt mixture, There is an effect of increasing the inter-aggregate interstitial stress, inducing the bridge effect between aggregates, thereby increasing the shear strength and tensile strength of the asphalt mixture.

This also has the advantage that it can be easily produced reinforcing fibers of the desired shape by injection molding.

Figure pat00001

Table 1 shows the preferred physical properties of the thermoplastic nylon 6 resin used as a material of the reinforcing fiber according to the present invention.

Hereinafter, a specific configuration of a fiber reinforced asphalt mixture in which reinforcing fibers are mixed according to the present invention will be described.

Fiber reinforced asphalt mixture according to the present invention is basically, the reinforcing fibers 100 described above; Asphalt binder having a penetration of 60 to 90; Aggregate; is configured to include.

In general, when the penetration of the asphalt binder is greater than 100, the viscosity of the asphalt binder is lowered, so that the required adhesion strength is not guaranteed. Therefore, the early plastic deformation is likely to occur. If the penetration is less than 50, the plastic binder may be advantageous due to the high viscosity. There is a limit in workability, workability and economic feasibility, and brittleness at low temperature is likely to cause cracks due to temperature changes.

Therefore, it is preferable to use the asphalt binder of 60-90 penetration.

Fiber reinforced asphalt mixtures with reinforcing fibers according to the present invention are expected to increase intermeshing intergranular stress, bridging effect between aggregates, toughness of asphalt mixtures, and roads using such fiber reinforced asphalt mixtures. In the case of paving, it is expected to have a beneficial effect in terms of construction convenience and economic efficiency as well as structural durability improvement effect by solving problems such as plastic deformation, fatigue cracking, and port hole breakage.

Fiber reinforced heating asphalt mixture according to the present invention can be used for the surface layer or base layer of the new asphalt road pavement, as well as can be used as an overlay layer material for repairing existing asphalt road pavement or plain concrete road pavement.

Particularly, when used for over-repairing in plain concrete road pavement with horizontal stripe, it is possible to expect the effects of noise reduction, flatness, ease of maintenance, and economic efficiency, which are advantages of general asphalt road pavement, and increase toughness due to fiber mixing. As a result, it is possible to expect the effect of suppressing the reflection crack that occurs mainly in the horizontal joint of the concrete pavement.

On the other hand, the fiber reinforced asphalt mixture according to the present invention should be mixed with each material, that is, asphalt binder, aggregate and fibers evenly distributed, and also have sufficient adhesion strength, shear strength and tensile strength.

When the amount of reinforcing fibers is increased more than an appropriate amount, it is difficult to mix the asphalt mixture and at the same time, it is difficult to increase the shear strength and tensile strength of the heated asphalt mixture due to expansion of the mixture when compacting the mixture.

The length of the reinforcing fibers should also be determined in consideration of the size of the aggregates contained in the asphalt mixture (the length that can span the neighboring aggregates and induce bridging effects between the aggregates).

Furthermore, the length and diameter of the reinforcing fiber, the diameter and mixing amount of the reinforcing part, and the size of the aggregate, depending on which part of the surface layer or asphalt base layer (including the intermediate layer and base layer) constituting the asphalt pavement structure And particle size should be different.

Table 2 shows the appropriate values according to the above.

Figure pat00002

That is, in the case of the surface layer, the coarse aggregate maximum size of the aggregate is 13mm, the length of the reinforcing fiber 100 is 5-15mm, the amount of the reinforcing fiber 100 is mixed 0.05 ~ 0.15 parts by weight (about 1kg per ton) ) Is appropriate.

As for the aggregate, it is preferable to apply an aggregate particle size distribution with a compactness of 2.5 mm (No. 8) sieve passage rate of 40 to 55% by weight (Fig. 8).

In the case of the intermediate layer, the coarse aggregate maximum size of the aggregate is 19mm, the length of the reinforcing fiber 100 is 15-25mm, the mixing amount of the reinforcing fiber 100 is 0.15 ~ 0.25 parts by weight (about 2kg per ton) proper.

As for the aggregate, it is preferable to apply an aggregate granularity distribution having a granulation degree of 25 to 35% by weight of 2.5 mm (No. 8) sieve passage (FIG. 9).

In the case of the base layer, the coarse aggregate maximum size of the aggregate is 25mm, the length of the reinforcing fiber 100 is 25-35mm, the mixing amount of the reinforcing fiber 100 is 0.3 ~ 0.4 parts by weight (3 ~ 4kg per ton) Is appropriate.

As for the aggregate, it is preferable to apply an aggregate granularity distribution having a granulation degree of 25 to 35% by weight of 2.5 mm (No. 8) sieve passage (FIG. 9).

As such, larger amounts of longer fibers are used for the middle and base mixtures than for the surface layer mixture, which corresponds to the pore and aggregate size that occurs larger than the surface layer in the middle and base layers. And to maximize aggregate engagement by unit weight expression.

Hereinafter, a method for producing a fiber reinforced asphalt mixture according to the present invention will be described.

Basically, the reinforcing fibers and aggregates are added to the plant mixer, followed by a dry beam, and the asphalt binder is added to the mixers, and the mixture is heated and mixed at 170 to 180 ° C.

At this time, the reinforcing fibers and aggregates are first mixed in a plant mixer (dry bibeam) for 10 to 20 seconds, and then the asphalt binder is added to the plant mixer (wet bibeam) to proceed with a process of mixing for 20 to 30 seconds.

As described above, the present invention pre-mixes the reinforcing fibers and the aggregates with a dry beam, so that the reinforcing fibers are evenly dispersed in the asphalt mixture.

Specific manufacturing method is as follows.

First, the produced mixture is transported safely to the installation site in accordance with the installation time while maintaining the quality.At this time, temperature maintenance (150 ± 10 ℃) is important for maintaining the quality of the mixture. Carry it with proper use.

Subsequently, the mixture transported to the installation site should be installed on the road according to its use, and the surface dust and other impurities should be completely removed before installation, and care should be taken to maintain the temperature of the mixture at 145 ± 10 ° C.

On the other hand, when the surface to be installed is wet, or when contaminants, rainy weather or mist occurs, it is preferable to stop the construction when the temperature is below 5 ℃.

Prior to the plant production of the fiber reinforced heating asphalt mixture, a production plan should be established (FIG. 10), and subjected to an indoor blending design (FIG. 11).

Hereinafter, a test procedure and results for demonstrating excellent physical properties of the fiber reinforced asphalt mixture according to the present invention will be described.

In order to confirm the fatigue characteristics of the physical properties of the asphalt mixture according to the present invention, the fatigue test was performed after the asphalt mixture specimens were prepared to have the characteristics shown in Table 3.

Figure pat00003

The specimen was used in the nylon fiber of Table 1, and aggregates having the characteristics of Table 4 and Table 5 were used.

Figure pat00004

Figure pat00005

Example 1 of the present invention is a specimen containing 0.3% by weight of reinforcing fibers, Example 2 is a specimen containing 0.6% by weight of reinforcing fibers, Example 3 is a specimen containing 0.3% by weight of reinforcing fibers, Comparative Example Relates to specimens incorporating reinforcing fibers.

The fatigue characteristics of the specimens were confirmed by applying a fatigue load by a dynamic load of 1 Hz (one load per second) (FIG. 12).

As a result of the test, the embodiments of the present invention reached failure after about 4800 times or about 5700 load times, but the comparative example was confirmed that the break at about 3000 times to 4000 times 1/2 of the above.

In the above described the case where the reinforcing fiber according to the present invention is applied to the asphalt mixture as an example, it can be expected to achieve excellent performance even if it is mixed for reinforcement in cement concrete and other materials.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

100: reinforcing fiber 110: main body
120: reinforcement

Claims (20)

A main body 110 having a straight structure;
Reinforcement parts 120 formed at both ends of the main body 110 to have a diameter larger than that of the main body 110;
Reinforcing fiber 100 containing. The method of claim 1,
The reinforcement part 120 is a reinforcing fiber 100, characterized in that the spherical structure. The method of claim 1,
Longitudinal section of the reinforcement portion 120 is a reinforcing fiber (100), characterized in that the diameter gradually increases toward the outside structure. The method of claim 3,
Longitudinal section of the reinforcement portion 120 is a reinforcing fiber 100, characterized in that the triangular structure. 5. The method of claim 4,
Reinforcement fiber 100, characterized in that the cross section of the reinforcement portion 120 is a circular structure. The method of claim 1,
The main body 110 and the reinforcement portion 120 is a reinforcing fiber 100, characterized in that formed integrally by a thermoplastic synthetic resin material. The method according to claim 6,
The main body 110 and the reinforcement portion 120 is a reinforcing fiber (100), characterized in that formed by a material containing a thermoplastic nylon 6 resin. The method of claim 7, wherein
The thermoplastic nylon 6 resin
Reinforcing fiber 100, characterized in that the melting point 200 ~ 230 ℃, tensile strength 500 ~ 800 kgf / ㎠, tensile elongation 50 ~ 60%, elastic modulus 20,000 ~ 25,000 kgf / ㎠, specific gravity 1.1 ~ 1.2 . Claim 1 to 8 any one of the reinforcing fibers (100);
Asphalt binder having a penetration of 60 to 90;
Aggregate;
Fiber reinforced asphalt mixture comprising a. 10. The method of claim 9,
In order to use for the surface layer, the coarse aggregate maximum dimension of the aggregate is 13mm, the length of the reinforcing fiber 100 is fiber reinforced asphalt mixture, characterized in that 5 ~ 15mm. The method of claim 10,
The reinforcing fiber 100 is fiber reinforced asphalt mixture, characterized in that 0.05 to 0.15 parts by weight of the total mixed. The method of claim 10,
The aggregate is fiber reinforced asphalt mixture, characterized in that the pass rate of the eighth body is 40 to 55% by weight. 10. The method of claim 9,
For use in the intermediate layer, the coarse aggregate maximum dimension of the aggregate is 19mm, the length of the reinforcing fiber 100 is fiber reinforced asphalt mixture, characterized in that 15 ~ 25mm. The method of claim 13,
The reinforcing fiber 100 is fiber reinforced asphalt mixture, characterized in that 0.15 ~ 0.25 parts by weight compared to the total. The method of claim 13,
The aggregate is fiber reinforced asphalt mixture, characterized in that the passing rate of the eighth body is 25 to 35% by weight. 10. The method of claim 9,
To use in the base layer, the coarse aggregate maximum dimension of the aggregate is 25mm, the length of the reinforcing fiber 100 is fiber reinforced asphalt mixture, characterized in that 25 ~ 35mm. 17. The method of claim 16,
The reinforcing fiber 100 is fiber reinforced asphalt mixture, characterized in that 0.3 to 0.4 parts by weight compared to the total. 17. The method of claim 16,
The aggregate is fiber reinforced asphalt mixture, characterized in that the passing rate of the eighth body is 25 to 35% by weight. A method for producing the fiber reinforced asphalt mixture of claim 9,
Dry bibim step of mixing the aggregate and the reinforcing fiber 100 in a dry state;
Adding the asphalt binder to the mixed aggregate and reinforcing fiber 100 and wet bibim step of mixing while heating;
Method for producing a fiber reinforced asphalt mixture comprising a. 20. The method of claim 19,
The dry bibim step is performed for 10 to 20 seconds, the wet bibim step is a method of manufacturing a fiber reinforced asphalt mixture, characterized in that performed for 20 to 30 seconds.
KR1020120000203A 2012-01-02 2012-01-02 Reinforcing fiber and asphalt composition using the same KR20130078996A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2466615A1 (en) * 2014-05-06 2014-06-10 Aglomerados Los Serranos, S.A. Bituminous composition and its use to reduce vibrations, noise and as an anti-cracking and anti-crack mixture (Machine-translation by Google Translate, not legally binding)
KR101455590B1 (en) * 2014-02-21 2014-10-31 김영석 Hybrid Fiber and Styrenic Thermoplastic Elastomer Modifier reinforced High Bond Asphalt Binder and Asphalt Composition
KR102035564B1 (en) * 2019-04-15 2019-10-23 이강문 Road Constructing Method Using Curing Apparatus for asphalt
CN114457643A (en) * 2022-01-22 2022-05-10 中国建设基础设施有限公司 High-performance steel fiber graded broken stone mixture and preparation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101455590B1 (en) * 2014-02-21 2014-10-31 김영석 Hybrid Fiber and Styrenic Thermoplastic Elastomer Modifier reinforced High Bond Asphalt Binder and Asphalt Composition
ES2466615A1 (en) * 2014-05-06 2014-06-10 Aglomerados Los Serranos, S.A. Bituminous composition and its use to reduce vibrations, noise and as an anti-cracking and anti-crack mixture (Machine-translation by Google Translate, not legally binding)
KR102035564B1 (en) * 2019-04-15 2019-10-23 이강문 Road Constructing Method Using Curing Apparatus for asphalt
CN114457643A (en) * 2022-01-22 2022-05-10 中国建设基础设施有限公司 High-performance steel fiber graded broken stone mixture and preparation method thereof

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