Fiber concrete preparation for pavement, preparation method of fiber concrete preparation and pavement construction method

Abstract

The invention discloses a fiber concrete preparation for a pavement, a preparation method thereof and a pavement construction method, relates to the technical field of road construction, and solves the problems of poor elasticity, durability and other performances of the existing pavement. Comprising a binding material composed of Portland cement, granulated blast furnace slag powder and silica fume, aggregate composed of continuous graded broken stone and machine-made sand, composite fiber composed of basalt fiber and polyvinyl alcohol fiber, a functional additive composed of a water reducing agent, a water-retaining agent and a defoaming agent, a catalyst composed of nano-silica and tricalcium aluminate, and water. The pavement construction method comprises the following steps: paving the preparation within 30 minutes, vibrating by adopting a high-frequency vibrator, leveling by adopting a laser leveling machine, covering with geotechnical cloth, and maintaining under standard conditions. The method can be applied to pavement construction, and is particularly suitable for severe pavement scenes such as severe cold and heavy load.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, specifically to a fiber-reinforced concrete preparation for road surfaces, its preparation method, and a road surface construction method. Background Technology

[0002] As a core structural material in road engineering, pavement concrete directly determines the road's load-bearing capacity, traffic safety, and service life. This material consists of cementitious materials (cement, mineral admixtures, etc.), aggregates, and water as its basic components. Through hydration reactions, it forms a dense cementitious skeleton that withstands vehicle loads and environmental erosion. Ideal pavement concrete must simultaneously meet three core requirements: First, it must possess good workability and stability during construction to prevent formwork collapse; second, it must possess excellent mechanical strength, elasticity, and crack resistance during service to withstand thermal shrinkage stress and load impacts; and third, it must possess strong durability during long-term service to resist environmental damage such as freeze-thaw cycles, carbonation, and salt corrosion.

[0003] Fiber-reinforced technology is a mainstream solution for improving concrete performance. Its core principle is to uniformly disperse short-cut fibers within the concrete matrix. Through interfacial bonding between the fibers and the matrix, it achieves the effects of bridging cracks and dispersing stress. When microcracks develop in concrete under load, the fibers can transfer stress between the crack ends, inhibiting crack propagation and simultaneously improving the concrete's toughness and impact resistance. Among various fiber types, basalt fiber is a commonly used reinforcing material for pavement concrete due to its high tensile strength, excellent corrosion resistance, and outstanding cost-effectiveness. Polyvinyl alcohol (PVA) fiber, on the other hand, demonstrates significant performance in inhibiting early shrinkage cracks due to its excellent elasticity, compatibility with the cement matrix, and crack-inhibiting effect. The combination of these two fibers has become a research direction that balances strength and elasticity.

[0004] However, existing pavement concrete technologies based on basalt fiber and PVA fiber composites still have many shortcomings that urgently need to be addressed. Firstly, the synergistic reinforcement effect of the fibers is poor. Most solutions simply mix the two fibers without optimizing the blending ratio and parameters according to the stress characteristics of the pavement. This results in the inability to fully utilize the high strength advantage of basalt fiber and the high elasticity advantage of PVA fiber, making it difficult to simultaneously achieve the required elastic modulus and elongation at break of the concrete. Under repeated impacts from heavy vehicles, rigid fracture is likely to occur. Secondly, the balance between construction stability and performance is prominent. To improve fiber dispersibility, it is often necessary to increase the amount of water or admixtures, which slows down the concrete setting speed. During construction, collapse and delamination are prone to occur due to self-weight or vibration. Simply increasing the cement content to accelerate setting exacerbates the risk of shrinkage cracks later. Thirdly, existing pavement concrete catalysts mostly aim to accelerate setting or reduce heat of hydration, with aluminate catalysts being the most common. While these can shorten setting time, they cannot improve the interfacial transition zone structure between the fiber and the matrix, thus limiting the fiber reinforcement effect. Later, microcracks easily appear in the concrete due to interfacial defects, leading to decreased durability. Fourth, service life still faces bottlenecks. Due to the aforementioned defects, the average service life of existing fiber-reinforced concrete pavement is usually only 8 to 12 years. In cold northern regions, due to the coupling effect of freeze-thaw cycles and crack propagation, the service life is even shorter, only 5 to 8 years. Frequent milling and repaving are required, which not only increases maintenance costs but also affects traffic efficiency.

[0005] Therefore, developing a high-elasticity and durable pavement concrete material that combines fiber synergistic reinforcement, construction stability and controlled setting, and optimized interface structure has become an urgent need to solve the industry's pain points. Summary of the Invention

[0006] To address the shortcomings of existing pavement materials in terms of elasticity and durability, this invention proposes a fiber-reinforced concrete formulation for pavement, its preparation method, and a pavement construction method.

[0007] The specific technical solution of the present invention is as follows: This invention first provides a fiber-reinforced concrete preparation for road surfaces, comprising the following components in parts by weight: Cementitious materials, 300-450 parts; aggregates, 1200-1600 parts; composite fibers, 15-30 parts; functional admixtures, 8-15 parts; catalysts, 2-5 parts; water, 120-180 parts; The cementitious material is composed of silicate cement, granulated blast furnace slag powder and silica fume in a mass ratio of 5:3:2, wherein the strength grade of the silicate cement is not lower than P·O42.5; The aggregate is a mixture of continuously graded crushed stone and manufactured sand with a mass ratio of 7:3 to 8:2; The composite fiber is a mixture of basalt fiber and polyvinyl alcohol fiber with a mass ratio of 2:1 to 3:1. The catalyst is a complex of nano-silica and tricalcium aluminate in a mass ratio of 1:1 to 1:2. The functional additives include a water-reducing agent, a water-retaining agent, and an antifoaming agent in a mass ratio of 6:3:1.

[0008] Preferably, the basalt fibers have a length of 12-18 mm and a diameter of 13-18 μm.

[0009] Preferably, the PVA fiber has a length of 8-12 mm and a diameter of 20-30 μm.

[0010] Preferably, the nano-silica particles in the special catalyst have a particle size ≤50nm and a tricalcium aluminate purity ≥95%.

[0011] Preferably, the crushed stone has a particle size range of 5~20mm and the fineness modulus of the manufactured sand is 2.6~3.0.

[0012] Preferably, the water-reducing agent is polyethylene glycol monomethyl ether methacrylate-acrylic acid copolymer; the water-retaining agent is hydroxypropyl methylcellulose; and the defoamer is polyoxypropylene polyoxyethylene ether or glyceryl monostearate.

[0013] The present invention also provides a method for preparing the above-mentioned fiber-reinforced concrete preparation for road surfaces, comprising the following steps: Add the aggregate to the mixer and dry mix for 2-3 minutes. Then add the composite fiber and continue to dry mix for 1-2 minutes to evenly disperse the fiber in the aggregate and obtain the premix. Mix the cementitious material with the functional additives and stir for 1-2 minutes. Then add 70% water and stir for 3-5 minutes until a uniform slurry is formed. Add the catalyst to the remaining water and ultrasonically disperse for 5-10 minutes to prepare a catalyst solution. Slowly add the catalyst solution to the slurry and stir for 2-3 minutes. Then pour it into the premix and stir for 5-8 minutes until the mixture is uniform, without clumping or segregation, to obtain the fiber-reinforced concrete composition.

[0014] The present invention also provides a road construction method, which applies the above-mentioned fiber-reinforced concrete preparation for road construction, and the road construction method includes the following steps: The pavement is laid with fiber concrete preparation within 30 minutes, with the paving thickness being 5-8 mm higher than the designed pavement thickness. Then, it is vibrated with a high-frequency vibrator for 20-30 seconds per point. After vibration, it is leveled with a laser screed and then covered with geotextile. It is then cured for 14-21 days at 20-25℃ and relative humidity ≥85%.

[0015] Preferably, the frequency of the high-frequency vibrator is set to 150~200Hz and the amplitude is 2~3mm.

[0016] Compared with the prior art, the specific beneficial effects of the present invention are as follows: This invention achieves the technical goals of high elasticity, durability, and ease of construction through a precise combination of composite fibers, cementitious materials, catalysts, and functional admixtures. The composite fibers and cementitious materials complement each other, with basalt fibers acting like reinforcing bars to support the cementitious skeleton and suppress macroscopic cracks. PVA fiber breakage can be mitigated by the flexible buffering and dispersion of micro-stress, preventing crack propagation. When combined, they form a tight bond with the cementitious system. The CSH gel generated during the hydration of the cementitious material coats the fiber surface, and the high activity of silica fume fills the interfacial voids between the fiber and the matrix. Test results show that this combination more than doubles the elongation at break of concrete compared to a single basalt fiber system, and also improves flexural strength to a certain extent. The nano-SiO2 in the catalyst fills the micropores of the cementitious material's hydration products, while its surface hydroxyl groups form chemical bonds with the CSH gel, strengthening the interfacial bond. Tricalcium aluminate accelerates the hydration process, regulates the setting rate, and prevents fiber settling due to excessive slurry fluidity. The combination of these two components creates a dual synergistic effect with the composite fibers. The comparison shows that the absence of a catalyst causes the concrete compressive strength to drop from 62.3 MPa to 45.2 MPa, and the freeze-thaw strength loss rate to surge from 4.1% to 15.3%. Polycarboxylate superplasticizers not only achieve high water reduction rates but also adsorb onto the fiber surface, preventing agglomeration; hydroxypropyl methylcellulose locks in moisture, providing continuous humidity for gel hydration and catalytic action; and the defoamer eliminates air bubbles generated during mixing, ensuring close contact between the fibers and the cementitious materials. The synergistic system formed by these four components ultimately enables the concrete to achieve superior performance in terms of compressive and flexural strength, as well as low freeze-thaw loss rate, far exceeding traditional single-component optimization techniques.

[0017] This invention can be applied to road construction, and is especially suitable for harsh road conditions such as extreme cold and heavy loads. Detailed Implementation

[0018] To make the technical solutions of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It should be noted that the following embodiments are only used to better understand the technical solutions of the present invention and should not be construed as limiting the present invention.

[0019] The specific information of some of the raw materials used in the following examples is as follows: The silicate cement is P·O 42.5 R; the granulated blast furnace slag powder is grade S95 with a specific surface area of ​​420 m². 2 / kg, activity index 98%; SiO2 content of silica fume ≥96%, specific surface area 22000m² 2 / kg; the defoamer used is polyoxypropylene polyoxyethylene ether (Examples 1, 3, 4) and glyceryl monostearate (Examples 2, 5); the water is municipal tap water with a pH of 6.8~7.2.

[0020] Example 1. The formula for this embodiment is as follows: 150g of cementitious materials, including 75g of silicate cement, 45g of granulated blast furnace slag powder, and 30g of silica fume; 600g of aggregates, including 420g of continuously graded crushed stone and 180g of manufactured sand (fineness modulus 2.6); 7.5g of composite fibers, including 5g of basalt fiber (length 12mm, diameter 13μm) and 2.5g of PVA fiber (length 8mm, diameter 20μm); 4g of functional admixtures, including 2.4g of water-reducing agent, 1.2g of water-retaining agent, and 0.4g of defoamer; 1g of catalyst, including 0.4g of nano-SiO2 (particle size 40nm) and 0.6g of tricalcium aluminate (purity 96%), in a mass ratio of 1:1.5; and 60g of water.

[0021] The specific steps are as follows: Using a JJ-5 planetary cement mortar mixer, 420g of continuously graded crushed stone and 180g of manufactured sand were added to the mixing pot. The mixing speed was set to 140r / min, and the mixture was dry-mixed for 2min. Then, 5g of basalt fiber and 2.5g of PVA fiber were added, and the mixture was dry-mixed for another 1.5min while maintaining the speed. The mixture was observed until the fibers were free of agglomeration and uniformly attached to the surface of the aggregates. The resulting premix was then ready for use.

[0022] Mix 75g of silicate cement, 45g of granulated blast furnace slag powder, and 30g of silica fume evenly. Add 2.4g of water-reducing agent and 1.2g of water-retaining agent, and put them into a mixer. Mix at 140r / min for 1.5min. Then add 42g of water, increase the mixing speed to 285r / min, and mix for 4min to form a uniform slurry with no lumps and good fluidity.

[0023] Take 0.4g of nano-SiO2 and 0.6g of tricalcium aluminate, add 18g of remaining water, pour into a KQ-500DE type CNC ultrasonic cleaner, set the power to 200W and the frequency to 40kHz, and ultrasonically disperse for 8min to prepare a uniform catalytic solution; slowly inject the catalytic solution into the gel slurry, stir at 285r / min for 2.5min until the slurry has a uniform color and no sediment.

[0024] Pour all the catalytic slurry into the premix and stir at 285 r / min for 6 min, stopping the machine twice during the process to ensure that there is no fiber clumping or aggregate sedimentation and segregation in the mixture, thus obtaining the finished fiber concrete formulation.

[0025] Example 2. The formula for this embodiment is as follows: 175g of cementitious materials, including 87.5g of silicate cement, 52.5g of granulated blast furnace slag powder, and 35g of silica fume; 650g of aggregates, including 487.5g of continuously graded crushed stone and 162.5g of manufactured sand (fineness modulus 2.7); 10g of composite fibers, including 6.65g of basalt fiber (length 14mm, diameter 15μm) and 3.35g of PVA fiber (length 10mm, diameter 25μm); 5g of functional admixtures, including 3g of water-reducing agent, 1.5g of water-retaining agent, and 0.5g of defoamer; 1.5g of catalyst, including 0.5g of nano-SiO2 (particle size 35nm) and 1g of tricalcium aluminate (purity 95%); and 70g of water.

[0026] The specific steps are as follows: Using a JJ-5 mixer, add 487.5g of crushed stone and 162.5g of manufactured sand, and dry mix at 140r / min for 2min; add 6.65g of basalt fiber and 3.35g of PVA fiber, and continue dry mixing for 1.5min until the fibers are evenly dispersed and there are no visible lumps, to obtain the premix.

[0027] Mix 87.5g cement, 52.5g slag powder, and 35g silica fume, add 3g water-reducing agent and 1.5g water-retaining agent, and stir at 140r / min for 1.5min; add 49g water, and stir at 285r / min for 4min to form a uniform slurry.

[0028] 0.5g of nano-SiO2 and 1g of tricalcium aluminate were added to 21g of water and ultrasonically dispersed at 200W and 40kHz for 8min to prepare a catalyst solution; after being injected into the slurry, the mixture was stirred at 285r / min for 2.5min.

[0029] The catalytic slurry is mixed with the premix and stirred at 285 r / min for 6 min until the mixture is uniform and free of segregation, thus obtaining the finished product.

[0030] Example 3. The formula for this embodiment is as follows: 200g of cementitious materials, including 100g of silicate cement, 60g of granulated blast furnace slag powder, and 40g of silica fume; 700g of aggregates, including 560g of continuously graded crushed stone and 140g of manufactured sand (fineness modulus 2.8); 12.5g of composite fibers, including 9.375g of basalt fiber (length 16mm, diameter 16μm) and 3.125g of PVA fiber (length 11mm, diameter 28μm); 6g of functional admixtures, including 3.6g of water-reducing agent, 1.8g of water-retaining agent, and 0.6g of defoamer; 2g of catalyst, including 0.8g of nano-SiO2 (particle size 45nm) and 1.2g of tricalcium aluminate (purity 97%), in a mass ratio of 1:1.5; and 80g of water.

[0031] The specific steps are as follows: Add 560g of crushed stone and 140g of manufactured sand to a JJ-5 mixer and dry mix at 140r / min for 2.5min; add 9.375g of basalt fiber and 3.125g of PVA fiber and continue dry mixing for 1.5min to ensure uniform fiber dispersion and obtain the premix.

[0032] Mix 100g cement, 60g slag powder, and 40g silica fume, add 3.6g water-reducing agent and 1.8g water-retaining agent, and stir at 140r / min for 2min; add 56g water, and stir at 285r / min for 4min to make a slurry.

[0033] 0.8g nano-SiO2 and 1.2g tricalcium aluminate were mixed with 24g water and ultrasonically dispersed at 200W and 40kHz for 8min to prepare a catalyst solution; after being injected into the slurry, the mixture was stirred at 285r / min for 2.5min.

[0034] The catalytic slurry is mixed with the premix and stirred at 285 r / min for 7 min until the mixture is uniform and free of lumps, thus obtaining the finished product.

[0035] Example 4. The formula for this embodiment is as follows: 210g of cementitious materials, including 105g of silicate cement, 63g of granulated blast furnace slag powder, and 42g of silica fume; 750g of aggregates, including 562.5g of continuously graded crushed stone and 187.5g of manufactured sand (fineness modulus 2.9); 14g of composite fibers, including 9.35g of basalt fiber (length 17mm, diameter 17μm) and 4.65g of PVA fiber (length 12mm, diameter 29μm); 7g of functional admixtures, including 4.2g of water-reducing agent, 2.1g of water-retaining agent, and 0.7g of defoamer; 2.25g of catalyst, including 0.9g of nano-SiO2 (particle size 30nm) and 1.35g of tricalcium aluminate (purity 96%); and 85g of water.

[0036] The specific steps are as follows: 562.5g of crushed stone and 187.5g of manufactured sand were put into a JJ-5 mixer and dry-mixed at 140r / min for 2min; 9.35g of basalt fiber and 4.65g of PVA fiber were added and dry-mixed for another 1.5min to obtain the premix.

[0037] Mix 105g cement, 63g slag powder, and 42g silica fume, add 4.2g water-reducing agent and 2.1g water-retaining agent, and stir at 140r / min for 1.5min; add 59.5g water, and stir at 285r / min for 4min to make a slurry.

[0038] 0.9g nano-SiO2 and 1.35g tricalcium aluminate were mixed with 25.5g water and ultrasonically dispersed at 200W and 40kHz for 8min to prepare a catalyst solution; after being injected into the slurry, the mixture was stirred at 285r / min for 2.5min.

[0039] The catalytic slurry is mixed with the premix and stirred at 285 r / min for 6.5 min until the mixture is uniform and free of segregation, thus obtaining the finished product.

[0040] Example 5 The formula for this embodiment is as follows: 225g of cementitious materials, including 112.5g of silicate cement, 67.5g of granulated blast furnace slag powder, and 45g of silica fume; 800g of aggregates, including 640g of continuously graded crushed stone and 160g of manufactured sand (fineness modulus 3.0); 15g of composite fibers, including 10g of basalt fiber (length 18mm, diameter 18μm) and 5g of PVA fiber (length 12mm, diameter 30μm); 7.5g of functional admixtures, including 4.5g of water-reducing agent, 2.25g of water-retaining agent, and 0.75g of defoamer; 2.5g of catalyst, including 0.85g of nano-SiO2 (particle size 50nm) and 1.65g of tricalcium aluminate (purity 98%); and 90g of water.

[0041] The specific steps are as follows: Add 640g of crushed stone and 160g of manufactured sand to a JJ-5 mixer and dry mix at 140r / min for 3min; add 10g of basalt fiber and 5g of PVA fiber and continue dry mixing for 2min to ensure complete fiber dispersion, thus obtaining the premix.

[0042] Mix 112.5g cement, 67.5g slag powder, and 45g silica fume, add 4.5g water-reducing agent and 2.25g water-retaining agent, and stir at 140r / min for 2min; add 63g water, and stir at 285r / min for 5min to form a uniform slurry.

[0043] 0.85g nano-SiO2 and 1.65g tricalcium aluminate were mixed with 27g water and ultrasonically dispersed at 200W and 40kHz for 8min to prepare a catalyst solution; after being injected into the slurry, the mixture was stirred at 285r / min for 3min.

[0044] The catalytic slurry is mixed with the premixed material and stirred at 285 r / min for 8 min until the mixture is uniform in color, free of fiber agglomeration and aggregate sedimentation, thus obtaining the finished product.

[0045] Comparative Example 1. Compared with Example 1, the catalyst component 1g was missing, while the other raw material types, amounts and parameters were the same as in Example 1.

[0046] Significant aggregate settling occurred during the preparation process, and the final mixture had a layer of slurry on its surface.

[0047] Comparative Example 2. Compared with Example 1, the 7.5g composite fiber component is missing, while the other raw material types, amounts and parameters are the same as in Example 1.

[0048] The final product mixture has no fiber clumping, but it is relatively fluid.

[0049] Comparative Example 3. Compared with Example 1, the 4g functional additive component is missing, while the types, amounts and parameters of the other raw materials are the same as in Example 1, and the total water volume remains unchanged.

[0050] Even after final mixing, some local clumps still exist.

[0051] Comparative Example 4. Compared with Example 1, 7.5g of composite fiber was replaced with 7.5g of single basalt fiber, while the other raw material types, amounts and parameters were the same as in Example 1.

[0052] Even after final mixing, trace amounts of fiber clusters are still visible.

[0053] Example of results. All the prepared formulations of the examples and comparative examples were spread within 30 minutes and compacted for 25 seconds per point using a ZDP-50 high-frequency vibrator (180Hz, amplitude 2.5mm). Then, they were leveled using an S-850 laser screed at a walking speed of 1m / min, covered with geotextile, and placed in a standard curing chamber (22℃, relative humidity 88%) for 18 days.

[0054] The 28-day compressive strength of the specimens was tested according to GB / T50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete". A 150mm×150mm×150mm cube specimen was used, with a loading rate of 0.5MPa / s. The 28-day flexural strength was tested using a 100mm×100mm×400mm prism specimen, with three-point loading and a loading rate of 0.05MPa / s.

[0055] According to GB / T50081-2019, the elongation at break was tested using a 100mm×100mm×300mm specimen. The longitudinal deformation at failure was measured using a displacement gauge, and the elongation was calculated.

[0056] According to GB / T50082-2009 "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete", the strength loss rate after 50 freeze-thaw cycles was tested using the rapid freeze-thaw method (-18℃~5℃), and the percentage difference between the compressive strength after freeze-thaw and before freeze-thaw was calculated.

[0057] Test the stability of construction, observe the indicators on site, and record whether there are collapse, delamination, or segregation phenomena during the paving and leveling process. It is divided into excellent (no defects), good (slight segregation), and poor (collapse / severe segregation).

[0058] Test the slump loss rate after 2 hours. According to GB / T50080-2016 "Standard for Test Methods of Performance of Ordinary Concrete Mixture", measure the initial slump and the slump after 2 hours, and calculate the proportion of the loss to the initial value.

[0059] For each embodiment and comparative example, three groups of compressive strength test blocks, three groups of flexural strength test blocks, three groups of elongation at break test blocks, and three groups of freeze-thaw cycle test blocks were prepared, with each group consisting of three test blocks. Construction stability and slump loss rates were determined through three parallel field tests, and the median result was used.

[0060] The test results are shown in Table 1.

[0061]

[0062] Based on the above test results, it can be determined that using the fiber-reinforced concrete formulation for road construction provided by this invention as a road construction material can stably achieve the technical goals of high elasticity, durability, and ease of construction, with its core indicators far exceeding those of ordinary road concrete. Specifically, this invention utilizes the interfacial filling effect of nano-SiO2 and the coagulation regulation effect of tricalcium aluminate to form a synergistic effect, which is the dual core of construction stability and performance improvement; the absence of these elements would directly lead to the failure of the technical solution. The rigidity enhancement of basalt fiber and the flexibility and toughening of PVA fiber complement each other, which is an effective way to achieve high elasticity and crack resistance. The dispersibility of water-reducing agent, the moisture locking of water-retaining agent, and the compaction effect of defoamer are all indispensable and are auxiliary key factors to ensure construction feasibility and durability.

[0063] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A fiber-reinforced concrete preparation for road surfaces, characterized in that, The components include the following parts by mass: Cementitious materials, 300-450 parts; aggregates, 1200-1600 parts; composite fibers, 15-30 parts; functional admixtures, 8-15 parts; catalysts, 2-5 parts; water, 120-180 parts; The cementitious material is composed of silicate cement, granulated blast furnace slag powder and silica fume in a mass ratio of 5:3:2, wherein the strength grade of the silicate cement is not lower than P·O 42.5; The aggregate is a mixture of continuously graded crushed stone and manufactured sand with a mass ratio of 7:3 to 8:2; The composite fiber is a mixture of basalt fiber and polyvinyl alcohol fiber with a mass ratio of 2:1 to 3:

1. The catalyst is a complex of nano-silica and tricalcium aluminate in a mass ratio of 1:1 to 1:

2. The functional additives include a water-reducing agent, a water-retaining agent, and an antifoaming agent in a mass ratio of 6:3:

1.

2. The fiber-reinforced concrete preparation for road surfaces according to claim 1, characterized in that, The basalt fibers are 12-18 mm in length and 13-18 μm in diameter.

3. The fiber-reinforced concrete preparation for road surfaces according to claim 1, characterized in that, The polyvinyl alcohol fibers have a length of 8-12 mm and a diameter of 20-30 μm.

4. The fiber-reinforced concrete preparation for road surfaces according to claim 1, characterized in that, The nano-silica particles in the special catalyst have a particle size ≤50nm and a tricalcium aluminate purity ≥95%.

5. The fiber-reinforced concrete preparation for road surfaces according to claim 1, characterized in that, The crushed stone has a particle size range of 5~20mm, and the fineness modulus of the manufactured sand is 2.6~3.

0.

6. The fiber-reinforced concrete preparation for road surfaces according to claim 1, characterized in that, The water-reducing agent is polyethylene glycol monomethyl ether methacrylate-acrylic acid copolymer; the water-retaining agent is hydroxypropyl methylcellulose; and the defoamer is polyoxypropylene polyoxyethylene ether or glyceryl monostearate.

7. A method for preparing a fiber-reinforced concrete formulation for road surfaces as described in any one of claims 1 to 6, characterized in that, Includes the following steps: Add the aggregate to the mixer and dry mix for 2-3 minutes. Then add the composite fiber and continue to dry mix for 1-2 minutes to evenly disperse the fiber in the aggregate and obtain the premix. Mix the cementitious material with the functional additives and stir for 1-2 minutes. Then add 70% water and stir for 3-5 minutes until a uniform slurry is formed. Add the catalyst to the remaining water and ultrasonically disperse for 5-10 minutes to prepare a catalyst solution. Slowly add the catalyst solution to the slurry and stir for 2-3 minutes. Then pour it into the premix and stir for 5-8 minutes until the mixture is uniform, without clumping or segregation, to obtain the fiber-reinforced concrete composition.

8. A road construction method, characterized in that, The pavement construction method, which utilizes the fiber-reinforced concrete formulation as described in any one of claims 1 to 6, comprises the following steps: The pavement is laid with fiber concrete preparation within 30 minutes, with the paving thickness being 5-8 mm higher than the designed pavement thickness. Then, it is vibrated with a high-frequency vibrator for 20-30 seconds per point. After vibration, it is leveled with a laser screed and then covered with geotextile. It is then cured for 14-21 days at 20-25℃ and relative humidity ≥85%.

9. The road construction method according to claim 8, characterized in that, The frequency of the high-frequency vibrator is set to 150~200Hz, and the amplitude is 2~3mm.

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