CN116161933A

CN116161933A - Black premix for road rush repair and application thereof

Info

Publication number: CN116161933A
Application number: CN202310416203.8A
Authority: CN
Inventors: 石俊清; 徐元荣
Original assignee: Hohhot Juri Special Chemical Building Materials Co ltd
Current assignee: Hohhot Juri Special Chemical Building Materials Co ltd
Priority date: 2023-04-19
Filing date: 2023-04-19
Publication date: 2023-05-26
Anticipated expiration: 2043-04-19
Also published as: CN116161933B

Abstract

The invention belongs to the technical field of pavement materials, and discloses a black premix for rush-repair of a road and application thereof, wherein the black premix is prepared by mixing water, powder and coarse aggregate according to a mass ratio of 0.12-0.13:1:0.5, and the powder comprises the following components in parts by weight: 450-520 parts of special cement, 550-650 parts of fine aggregate, 30-35 parts of functional material components, 18-22 parts of colorant, 38-45 parts of fiber components and 20-50 parts of mineral admixture; the black premix can recover traffic after rush repair, can shorten the traffic time of open vehicles, has strong toughness and compactness, can obviously enhance the bearing capacity and cracking resistance of the pavement, and reduces the generation of cracks when a newly repaired pavement passes through an overloaded vehicle.

Description

Black premix for road rush repair and application thereof

Technical Field

The invention belongs to the technical field of pavement materials, and particularly relates to a black premix for road rush repair and application thereof.

Background

With the rapid development of urbanization, various infrastructures in cities are becoming vulnerable to entering maintenance and reinforcement lines as the time taken to service increases. For example, urban road surfaces are provided with a number of corresponding inspection wells, the presence of which affects to some extent the integrity, structural stability of the road, and breakage of the road is mostly concentrated around the inspection wells. Therefore, the problem that concrete around various pipeline inspection wells in urban roads is easy to damage becomes a difficult problem in road construction.

In addition, in road and bridge structures, bridge expansion joints are also vulnerable parts, and are often arranged between two beam ends of a bridge and between the beam ends and a bridge abutment, and the bridge expansion joints have the effect of adjusting the connection and displacement between upper structures caused by vehicle loads and expansion and contraction of bridge building materials. The expansion joint is usually arranged on the post-pouring belt, in bridge operation, the concrete of the expansion joint post-pouring belt is subjected to repeated impact action of vehicle load for a long time and is subjected to natural environment and weathering erosion action for a long time, the abrasion of concrete materials is serious, in the actual construction process, the concrete strength of the structure is low, the structural concrete is low in strength and large in shrinkage, the structural concrete is easy to crack under strong load impact, the bonding property is poor, the bonding degree of the structural concrete and the old concrete is low, and the structural concrete is further subjected to long-time erosion penetration of rainwater, so that steel fibers in the concrete are rusted, expanded and damaged.

The road is damaged, so that the traffic safety is directly influenced, the road must be repaired in time, the conventional repairing method is to perform low-strength concrete casting at the damaged place, the concrete casting on site cannot accurately control the quantity and the feeding sequence of various materials, the concrete structure is not compact, the early strength is low, the maintenance time is long, the turnover of the template is slow, the normal traffic is influenced, and the repaired road is also subjected to the problem of secondary damage. Therefore, developing a black premix for road rush repair with super early strength and high strength performance is an urgent problem to be solved.

Disclosure of Invention

In order to solve the defects in the background art, the invention aims to provide the black premix for the rush repair of the road, and the black premix for the road realizes the adjustable purposes of the construction performance and the physical and mechanical properties of the materials through the continuous grading, the aggregate collocation design of the close packing principle and the reinforcing effect of fiber combination, the matching synergy of the cementing materials and the filling effect of the micro-grade materials.

The aim of the invention can be achieved by the following technical scheme:

the black premix for the rush-repair of the road is characterized by being prepared by mixing water, powder and coarse aggregate according to a mass ratio of 0.12-0.13:1:0.5, wherein the powder comprises the following components in parts by weight:

450-520 parts of special cement,

550 to 650 parts of fine aggregate,

30-35 parts of functional material components,

18-22 parts of a coloring agent,

38-45 parts of fiber component,

20-50 parts of mineral admixture;

the fiber combination is prepared from steel fibers and polyvinyl alcohol fibers according to a weight ratio of 40:1, wherein the functional material comprises the following components in parts by weight: 26-30: 2.0 to 2.5: 28-35: 6-9: 2-3: 6-9: 18-22 parts.

Preferably, the special cement is formed by mixing one or two of quick hardening sulphoaluminate cement, ordinary silicate cement or silicate cement with calcium sulphoaluminate powder;

the strength grade of the rapid hardening sulphoaluminate cement is 42.5 or 52.5, the strength grade of the ordinary portland cement is P.O 52.5.5 or P.O 42.5.42.5, the strength grade of the portland cement is P.I 52.5.5 or p.ii 52.5, and the strength grade of the calcium sulphoaluminate powder is 72.5 or 82.5.

Preferably, the fine aggregate is iron ore tailing ore with the continuous grading of 0.3-4.75 mm in particle size, and the coarse aggregate is iron ore tailing ore with the continuous grading of 5-20mm in particle size.

Preferably, the colorant is iron oxide black or a black aqueous dye.

Preferably, the steel fibers are end hook type copper plating steel fibers, the length is 13mm, the diameter is 0.18-0.2 mm, the length-diameter ratio is 65-75, and the tensile strength is not lower than 2600MPa; the length of the polyvinyl alcohol fiber is 6mm, the diameter is 0.1-0.2 mm, and the tensile strength is not lower than 1400MPa.

Preferably, the mineral admixture is one or more of silica fume, mineral powder, metakaolin, fly ash and glass beads.

Preferably, the expanding agent is prepared from calcium sulfoaluminate expanding agent and plastic expanding agent according to the proportion of 80:1, wherein the plastic expanding agent is azo compound.

The black premix for the road rush repair is applied to the road rush repair construction, and other components except water and coarse aggregate of the black premix are pre-stirred into uniform dry powder material in a professional factory, and are mixed and stirred with water and coarse aggregate according to a specified proportion to form slurry for use in a construction site.

Preferably, the initial slump and the expansion degree of the black premix for the road rush repair are 550-650 mm, the initial setting is 10-15 min, and the final setting is 15-20 min; the compressive strength is more than or equal to 30MPa for 40min, more than or equal to 35MPa for 2h, more than or equal to 45MPa for 4h, more than or equal to 60MPa for 24h, and more than or equal to 90MPa for 28 d.

Preferably, in the use process, the method for treating the new and old concrete interfaces comprises the steps of removing old concrete, roughening the surface and roughening the joint surface, controlling the surface roughness within the range of 1.5-3 mm, keeping the surface moist, then post-casting black premix, and improving the adhesion of the new and old interfaces by adopting a surface roughness and slurry viscosity composite control method.

The invention has the beneficial effects that:

the black premix for the road rush repair is green and environment-friendly, reduces the resource consumption, firstly, the mineral admixture, mineral powder, fly ash and silica fume are added, the using amount of cement is reduced, secondly, the coarse and fine aggregate is iron tailing ore, the industrial tailings are reduced, the carbon dioxide in cement production is indirectly reduced, and the black premix meets the requirements of the black premix for the green road rush repair.

The black premix for the rush repair is designed to meet the requirements of different construction performances on the rush repair of municipal inspection wells and the use of bridge expansion joints, and the compressive strength of the black premix for the rush repair reaches 35MPa after 40min, 40MPa after 2h and 60MPa after 1 d. The black premix for rush repair can recover traffic 40 minutes after rush repair, meanwhile, the consistency of the color of the black premix for rush repair and the original pavement of asphalt is solved, the original blackness of the surface of the black premix can be kept for a long time, the rush repair time and the workload are saved, the wear resistance of the repaired pavement is improved, the crack resistance is improved, the toughness is high, the super strength and the super early strength are realized, the waterproof performance is high, the service life of the repaired pavement is greatly prolonged, and the maintenance cost of the road is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.

FIG. 1 is a fiber distribution diagram in a test piece of a black premix for road rush repair prepared in SN example 1;

fig. 2 is a color difference comparison chart of a black premix test piece for road rush repair, an asphalt test piece and a common concrete test piece, which are prepared in SN example 2.

Detailed Description

The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The black premix for the rush repair of the road comprises the following components in parts by weight as shown in table 1:

special cement

Fine aggregate

Functional material component

Coloring agent

Fiber combination

Mineral admixture

Coarse aggregate

450-520 parts

550-650 parts

29-32 parts

18-22 parts

38-42 parts

45-60 parts

550-650 parts

Wherein the functional material is composed of the following components in parts by weight as shown in table 2:

expanding agent

Retarder agent

Exciting agent

Water reducing agent

Defoaming agent

Waterproof agent

Black aqueous dye

Adhesive agent

240-260 parts

26-30 parts

2.0 to 2.5 parts

28-35 parts

6-9 parts

2-3 parts

6-9 parts

18-22 parts

The black premix for the rush repair of the road is prepared by firstly adding various cement, composite functional materials, iron oxide black and mineral admixture into various materials under standard weighing and metering, then adding metered fiber combinations into a special roller fiber dispersing machine above a gravity-free mixer, dispersing into the gravity-free mixer through the roller fiber dispersing machine for stirring, finally adding various fine aggregates with three continuous gradations, stirring for five minutes, discharging and packaging. Transporting to a construction site according to the water ratio of 0.12-0.13 of powder to coarse aggregate: 1: and (5) stirring for 4min to obtain black premix slurry for road rush repair.

The composition of the black premix for quick setting (abbreviated as SN) and slow setting (abbreviated as HN) road rush repair according to the invention is shown by specific examples. The composition of the mass components of the black premix for rush repair of each road in SN examples 1 to 5 and HN examples 1 to 5 is shown in Table 3

Special cement

Fine aggregate

Functional material component

Coloring agent

Fiber combination

Mineral admixture

Coarse aggregate

SN example 1

500 parts of

560 parts of

33 parts of

20 parts of

40 parts of

50 parts of

600 parts of

SN example 2

480 parts of

560 parts of

33 parts of

40 parts of

50 parts of

600 parts of

SN example 3

510 parts of

560 parts of

32 parts of

10 parts of

40 parts of

50 parts of

600 parts of

SN example 4

500 parts of

580 parts of

33 parts of

20 parts of

50 parts of

600 parts of

SN example 5

500 parts of

560 parts of

32 parts of

20 parts of

40 parts of

50 parts of

600 parts of

HN example 1

500 parts of

560 parts of

33 parts of

20 parts of

40 parts of

50 parts of

600 parts of

HN example 2

520 parts of

560 parts of

32 parts of

0 part of

40 parts of

50 parts of

600 parts of

HN example 3

500 parts of

560 parts of

33 parts of

20 parts of

40 parts of

50 parts of

600 parts of

HN example 4

500 parts of

580 parts of

33 parts of

20 parts of

50 parts of

600 parts of

HN example 5

550 parts

560 parts of

33 parts of

20 parts of

40 parts of

0 part of

600 parts of

The special cements in the embodiments SN1-SN4 and HN1-HN4 are respectively 52.5 quick hardening sulphoaluminate cement, PII 52.5 silicate cement and 72.5 high-strength calcium sulphoaluminate powder according to the weight ratio of 14:5:1. And various indexes of the cement accord with national standards.

The fine aggregate in the embodiment is low-grade waste iron ore generated when iron powder is selected by an iron ore dressing plant, and the fine aggregate is prepared by grinding and screening by a ball mill. The particle size is 0.3-4.75 mm, the apparent density is 2856kg/m, the bulk density is 1750kg/m, the void ratio is 38.9%, the stability of the iron tailing stone is qualified, and the standard requirement of GB/T14684-2011 building sand is met. Wherein the proportion of iron tailing ores with different particle diameters is 0.3-0.6 mm: 0.6-1.18 mm: 1.18-2.36 mm: the weight ratio of 2.36-4.75 mm is 1:2:2:1.

in the embodiment, the composite functional material comprises components of an expanding agent, a retarder, an exciting agent, a water reducing agent, a defoaming agent, a waterproofing agent, a black water-based dye and a binding agent according to 255:27:2.4:30:8:2.4:7:20 weight ratio.

In the embodiment, the colorant is composed of iron oxide black powder and black water-based dye according to the weight ratio of 20:1.

In the above examples, the fiber combination consisted of steel fibers and polyvinyl alcohol fibers in a weight ratio of 40:1. The steel fiber adopts end hook type copper plating steel fiber, the density is 7800kg/m, the length is 13mm, the length-diameter ratio is 65, and the flexural strength is 2800 MPa. The polyvinyl alcohol fiber adopts coarse polyvinyl alcohol fiber with tensile strength of more than or equal to 1200MPa, length of 6mm, length-diameter ratio of 70 and density of 980 kg/m.

In the embodiment, the mineral admixture consists of one or more of silica fume, fly ash mineral powder, metakaolin, glass beads and the like, wherein the content of active silica in the silica fume is more than or equal to 90 percent, and the specific surface area is 18000-22000 m ² The water demand ratio per kg is not more than 110%, and the activity is more than 115% in 28 days. The fly ash is selected from class I fly ash of Daqi power plant, and its specific surface area is 600m ² The water demand is less than 1, and the activity index is more than or equal to 90 percent. The mineral powder is Xuan Gang S105 mineral powder with 28 days activity index of more than 110% and specific surface area of 650-750m ² Per kg, the average grain diameter is less than or equal to 10um, and the water demand ratio is less than or equal to 100 percent.

The metakaolin is selected from those provided by inner Mongolia super-brand kaolin limited company, and has a specific surface area of 15000-20000 m ² Kg, activity index > 110%, al ₂ O ₃ The content is more than or equal to 38 percent, siO ₂ The content is more than or equal to 45 percent.

In the embodiment, the coarse aggregate adopts low-grade waste iron ore generated during iron ore dressing of the Shibao iron ore in Wuchuan county of inner Mongolia, and is prepared into a mixture with the diameter of 5-20mm through continuous collection through screening. The crushing value is less than or equal to 10%, the content of needle-shaped particles is less than or equal to 5%, the content of mud is less than or equal to 0.5%, and other indexes meet the requirements of coarse aggregate in JGJ52-2011 standard.

In order to verify the excellent performance of the black premix for road repair according to the present invention, the following comparative experiments were conducted with reference to the black premix composition for road repair in SN example 1 and HN example 1 described above. Respectively change: the composition of the coloring agent, the use of river sand and machine-made sand, the optimization and comparison of special cement combination, the adjustment of retarder and the exchange of different varieties, the replacement of fiber combination, the lack of mineral admixture and the supplement of the lack of quality to the content of the sulfur-aluminum cement. SN the distribution of fibers in a test piece of the black premix for road rush repair prepared in example 1 is shown in fig. 1.

In the above SN example 2, one-component iron oxide black was used, and the other components were the same as in SN example 1. The color difference between the black premix test piece for road rush repair prepared in the SN example 2 and the asphalt test piece and the common concrete test piece is shown in fig. 2.

The SN example 3 described above uses a single component black aqueous dye, the missing colored portion is supplemented by a quick hardening sulfoaluminate cement, and the other components are the same as in SN example 1.

In the SN example 4, the fine aggregate adopts common river sand, the coarse aggregate adopts machine crushed stone and the 5-20mm continuous graded mixture. 20 parts of steel fiber component, the mixing amount of the water reducer is increased by SR-600-S YS-P400, the missing part is supplemented by fine aggregate, and other components are the same as those in SN example 1.

The PII 52.5 silicate cement in the special cement in the SN example 5 is replaced by 52.5 quick hardening sulphoaluminate cement, and the fine aggregate is replaced by machine-made sand with the continuous gradation of 0.3-4.75 mm. The other components were the same as in SN example 1.

The HN example 2 described above lacks a colored portion, the missing portion being supplemented with rapid hardening sulfoaluminate cement, and the other components being the same as those in HN example 1.

The special cement component of HN example 3 lacks the 72.5 calcium sulfoaluminate powder, the part lacking is supplemented with portland cement, and the other components are the same as those of HN example 1.

The fine aggregate in HN example 3 is replaced by equal proportion machine-made sand, and the coarse aggregate is composed of common machine-made broken stone 5-20mm continuous grading mixture. All steel fiber components are replaced by 20 parts of basalt fiber, the missing fiber part is supplemented by fine aggregate, and other components are the same as in SN example 1.

The mineral-deficient blend of HN example 5 described above, the deficient portion being supplemented with rapid hardening sulphoaluminate cement, the other components being identical to those of HN example 1.

The black premix for the rush repair of the SN examples 1-5 and the black premix for the rush repair of the HN examples 1-5 are prepared according to the following steps: powder material: the coarse aggregate is 0.12-0.13:1: pouring 0.5 of the mixture into a test die after water mixing, vibrating for 15 to 20 seconds by a vibrating table after the test die is fully filled once until the surface of the test die is free of exposed steel fibers, scraping the surface, and covering a film for standard maintenance and demoulding.

Performance testing

The black premix for road rush repair of SN examples 1 to 5 and HN examples 1 to 5 was tested. 1. The working performance is carried out according to the standard GB/T50080-2016 general concrete mixture Performance test method. 2. And (3) carrying out a cubic physical performance experiment, namely carrying out test piece standard maintenance on the test pieces according to relevant regulations in GB/T50081-2019 'test method Standard for physical mechanical properties of concrete', wherein the test pieces have 100mm x 400mm, 100mm x 100mm and compressive strength and the compressive strength of the test pieces are tested by 1d, 7d and 28 d. The results of various performance tests on the black premix for road rush repair of SN examples 1 to 5 and HN examples 1 to 5 are shown in Table 4.

	SN-1	SN-2	SN-3	SN-4	SN-5	HN-1	HN-2	HN-3	HN-4	HN-5
											Premix slump initial mm	220	210	180	230	185	225	226	228	205	190
Initial mm of expansion	650	580	350	750	380	680	690	700	450	375
											Initial setting min	12	13	14.5	20	11	50	48	65	53	23
Final setting min	17	18	20	25	13	55	53	70	58	28
											Compressive strength MPa 40min	28	26	20	13	29	-	-	-	-	22
Compressive strength MPa 1h	34	30	22	23	36	11	9	-	10	32
											Compressive strength MPa 1.5h	38	32	26	34	38	38	39	12	35	34
Compressive strength MPa 2h	42	36	28	38.2	40	45	43	30	41	38
											Compressive strength MPa 4h	46	38	29.5	39.6	42	46.5	45	36	42	41
Compressive strength MPa 1d	52	48	42	43	45	54.1	52	44	53	48
											Compressive strength MPa 7d	61	53	48	50	58	59.9	63	61	60.2	62
Compressive strength MPa 28d	81	74	56	68	72	87	92	77	78	84
											Flexural strength MPa 1d	6	6.6	5.3	5.2	5	6.2	6.5	5	6.5	5.6
Flexural strength MPa 7d	8	7.2	6.6	6.5	7	8	7.8	7.6	7.5	7.8
											Flexural strength MPa 28d	10	9	8.8	9.6	9	11.1	11.2	9.5	10	11
Plastic shrinkage	10	12	12	18	10	13	14	14	15	10
											Self-shrinkage of material	310	315	360	380	345	315	290	330	360	365
Premix bonding strength MPa	6.4	6.2	5.8	5.1	5.7	6.8	7.0	6.51	5.9	6.2

The experimental results show that the black premix for road rush repair prepared by adopting the special cement, the fine aggregate, the expanding agent, the water reducing agent, the waterproofing agent, the retarder, the coloring agent, the fiber, the mineral admixture and the like and adjusting different dosages of the special cement, the fiber and the retarder, water consumption, different varieties of the water reducing agent and different blending amounts has the characteristics of excellent blackness, good workability, super early strength, high strength, good impact property wear resistance, good waterproofness, micro-expansion, low shrinkage, high adhesion and the like.

SN the colorants in examples 1-3 were, respectively: the iron oxide black is mixed with the black water-based dye, the iron oxide black is all-black water-based dye, and other components are the same. The performance data shows: the use of high amounts of black aqueous dye leads to a significant deterioration in the fluidity of the slurry. Affecting the adequate dispersion of the colorant and the discharge of slurry bubbles. Therefore, the mechanical properties of the black premix are reduced to a certain extent.

Pure iron oxide black is used as a colorant, the content of the iron oxide black is high, the coloring capability is poor, and the fluidity and mechanical properties of the freshly mixed black premix are slightly reduced.

Iron oxide black and a black aqueous dye are used, and are blended as colorants. On one hand, the black aqueous dye has higher coloring intensity, and on the other hand, the single-doped amount of the iron oxide black is reduced, so that the excellent surface coloring effect, higher color fastness and excellent performance are obtained.

SN example 4 lacks a portion of the fibrous component and the fine and coarse aggregates are replaced by the iron tailings stone with normal river sand and normal granite. The water reducer SR-600-S is replaced by YS-P400, the mixing amount is increased, and other components are the same as those in SN example 1. The performance data show that the slump and the expansion degree of the slurry of the black premix added with the additive are both increased, the slurry is suitable for layering segregation, shrinkage and deformation, the performance is deteriorated, and the mechanical performance and other physical properties of the black premix are slightly reduced due to the reduction of the fiber component. Therefore, the proportion of the aggregate, the fiber mixing amount, the reasonable collocation of the water reducing agent and the retarder are reasonably controlled, and the workability and other physical properties of the slurry can be maintained after the mortar is used.

SN example 5, the proportion of the special cement was adjusted, the pii 52.5 portland cement was replaced with 52.5 rapid hardening sulfoaluminate cement, and the fine aggregate was crushed from machine-made sand, and the other components were the same as in example 1. The performance data show that due to the lack of the PII 52.5 silicate cement, the increase of the rapid hardening sulphoaluminate cement, the slump and the expansion degree of the slurry of the black premix are obviously reduced, the initial setting time and the final setting time are shortened, the early strength is high, and the 28d strength is slowly increased.

In HN example 2, the coloring component was absent, the absent portion was supplemented with rapid hardening sulfoaluminate cement, and the other components were the same as those in HN example 1. The performance data show that the slump and the expansion degree of the slurry of the black premix are improved slightly, and other mechanical properties are improved slightly. In the aspect of ensuring the consistency of the colors of the road surfaces, the mechanical properties of the colored parts are slightly influenced by the addition of the colored parts, and the strength margin coefficient of the black premix is considered in the design process.

In HN example 3, the reinforcing component of 72.5 calcium sulfoaluminate powder in the special cement component was absent, the absent part was supplemented with Portland cement, and the other components were the same as those in HN example 1. The performance data show that the slump and the expansion degree of the slurry of the black premix are improved slightly, the initial and final time is prolonged by 15 minutes compared with HN example 1, the open passage time is prolonged after repair, and other mechanical properties are slightly reduced.

In HN example 4, a steel fiber portion was taken out, a portion of basalt fiber was added, the missing fiber portion was supplemented with fine aggregate, the fine aggregate was replaced with iron tailing ore by machine-made sand, and the other components were the same as those in HN example 1. The performance data show that the slump and the expansion of the slurry of the black premix are reduced slightly, so that the embodiment 4 can show that the mechanical properties of the black premix are improved ideally when the fiber combination is used in reasonable combination.

In HN example 5, mineral admixture was absent, the absent portion was supplemented with rapid hardening sulfoaluminate cement, and the other components were the same as in HN example 1. The performance data show that the slump and the expansion degree of the slurry of the black premix are reduced, the initial setting and the final setting are shortened by 27 minutes compared with HN example 1, and other mechanical properties are obviously reduced.

In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.

Claims

1. The black premix for the rush-repair of the road is characterized by being prepared by mixing water, powder and coarse aggregate according to a mass ratio of 0.12-0.13:1:0.5, wherein the powder comprises the following components in parts by weight:

450-520 parts of special cement,

550 to 650 parts of fine aggregate,

30-35 parts of functional material components,

18-22 parts of a coloring agent,

38-45 parts of fiber component,

20-50 parts of mineral admixture;

2. The black premix for road rush repair according to claim 1, wherein the special cement is formed by mixing one or two of quick hardening sulphoaluminate cement, ordinary portland cement or portland cement with calcium sulphoaluminate powder;

3. The black premix for road rush repair according to claim 1, wherein the fine aggregate is iron ore tailing with a continuous gradation of 0.3-4.75 mm in particle size, and the coarse aggregate is iron ore tailing with a continuous gradation of 5-20mm in particle size.

4. The black premix for road repair according to claim 1, wherein the colorant is iron oxide black or a black aqueous dye.

5. The black premix for road rush repair according to claim 1, wherein the steel fibers are end hook type copper-plated steel fibers, have a length of 13mm, a diameter of 0.18-0.2 mm, an aspect ratio of 65-75 and a tensile strength of not less than 2600MPa; the length of the polyvinyl alcohol fiber is 6mm, the diameter is 0.1-0.2 mm, and the tensile strength is not lower than 1400MPa.

6. The black premix for road rush repair according to claim 1 wherein the mineral admixture is one or more of silica fume, mineral powder, metakaolin, fly ash and glass beads.

7. The black premix for road repair according to claim 1, wherein the expanding agent is prepared from calcium sulfoaluminate expanding agent and plastic expanding agent according to the proportion of 80:1, wherein the plastic expanding agent is azo compound.

8. The application of the black premix for road rush repair according to any one of claims 1-7 in road rush repair construction, which is characterized in that the black premix is prepared by pre-stirring other components except water and coarse aggregate into uniform dry powder in a professional factory, and mixing and stirring the dry powder, water and coarse aggregate into slurry according to a specified proportion in a construction site.

9. The application of the black premix for road rush repair in the road rush repair construction according to claim 8, wherein the initial slump and the expansion of the black premix for road rush repair are 550-650 mm, initial setting is 10-15 min, and final setting is 15-20 min; the compressive strength is more than or equal to 30MPa for 40min, more than or equal to 35MPa for 2h, more than or equal to 45MPa for 4h, more than or equal to 60MPa for 24h, and more than or equal to 90MPa for 28 d.

10. The application of the black premix for road rush repair in the road rush repair construction according to claim 8, wherein in the use process, the new and old concrete interface treatment method is as follows, after old concrete is removed, surface roughening and roughening pretreatment are carried out on the joint surface, the surface roughness is controlled within the range of 1.5-3 mm, the surface is kept moist, then the black premix is poured later, and the adhesion of the new and old interfaces is improved by adopting a surface roughness and slurry viscosity composite control method.