CN110240454A - A method of repairing concrete pavement using native fiber cement-based repair material - Google Patents

Abstract

A method for repairing concrete pavement using raw fiber cement-based repair materials, comprising the following steps: carrying out a mixing ratio experiment of cement-based composite materials before construction, and conducting experimental verification to obtain the optimal mixing ratio of cement-based composite materials; The crushing of cement concrete pavement, through impact equipment, breaks the whole cement concrete pavement into pieces at one time, so that the pavement is transformed from the overall working state to the working state of aggregates; after the pavement is crushed, it is compacted to ensure the crushing Layer stability and smoothness, so as to realize the transformation of old concrete slabs from old surface slabs to new pavement bases; prepare raw fiber cement-based composite materials according to the optimal mix ratio of cement-based composite materials, pour and vibrate and smooth; 1 hour Afterwards, cover with geotextile and sprinkle water for maintenance. Using this material to repair the damaged pavement can improve the broken board and punching phenomenon of the concrete pavement due to its own brittleness, avoid the appearance of wide cracks, and improve the durability of the pavement.

Description

A method of repairing concrete pavement using native fiber cement-based repair material

technical field

The invention relates to a method for repairing concrete pavements using raw fiber cement-based repair materials.

Background technique

Cement concrete pavement is widely used because of its low price and abundant reserves of raw materials, simple preparation process and durability. However, after a certain number of years of service, local diseases such as cracks, holes, potholes, corner fractures, and surface peeling are prone to appear under the coupled effects of environmental erosion and driving loads. If these local diseases are not repaired effectively and in time, the disease will Further aggravation, ultimately affecting driving comfort, safety and service life of the road surface.

The existing cement-based repair materials for cement concrete pavement diseases mainly include the following categories: 1) Ordinary cement concrete repair materials have poor cohesiveness and large shrinkage, resulting in poor durability of the repaired road surface, and the damaged areas often need to be repaired repeatedly, so It is difficult to meet the actual needs; 2) polymer modified cement-based repair materials, which have disadvantages such as high cost, great environmental pollution and low strength; 3) ordinary early-strength cement-based repair materials, which have complex formulas, In the later stage, there are shortcomings such as shrinkage and inconsistent shrinkage deformation, which are easy to produce interface cracks.

In order to improve the above problems, the patent publication No. CN109626920A discloses a quick repair material for concrete pavement with high strength and durability. The quick repair material consists of water, cement, fly ash, cellulose fiber, fine aggregate, It is prepared from gravel, fast-setting early-strength components and water-reducing agent. It has high compressive strength and flexural-tensile strength, and has no shrinkage in long-term strength; it also has frost resistance, impermeability, and corrosion resistance. Excellent durability. And the patent publication number is CN109250994A discloses a kind of concrete repair material for quick repair of high-speed pavement, and described repair material comprises water, cement, quartz sand, stone, silica fume, water reducer, retarder, polyvinyl alcohol fiber. The above two patents have the following three points of difference from this patent: First, compared with the above-mentioned traditional repair materials, the maximum crack width produced after repairing the pavement is reduced, but, because of the presence of gravel, the crack width remains the same. It is at the centimeter level, which is still far greater than the maximum crack width of 50 μm in this patent; second, because the price of cellulose fiber and polyvinyl alcohol fiber is much higher than that of virgin fiber, the cost of this type of patent is higher than this patent; third, this type of The repair material used in the patent still belongs to the category of concrete, and concrete is a brittle material with poor toughness, low tensile strength and bond strength, high elastic modulus and poor deformation ability. It is easy to cause poor interface bonding when it is used for concrete pavement repair. Quality problems such as firmness and cracking lead to re-damage of the coagulation pavement. However, this patent uses raw fiber cement-based composite material as a repair material. The composite material composed of coal ash, chemical additives and water through the composite process, because no coarse aggregate is mixed in its preparation components, so this material is different from traditional concrete and belongs to the category of cement. Compared with traditional concrete, the cement-based composite material has improved mechanical properties such as toughness and tensile strength.

Contents of the invention

The purpose of the present invention is to provide a method for repairing concrete pavements using raw fiber cement-based repair materials, which can be applied to repairing damaged concrete pavements, and the construction is simple and fast.

The technical solution of the present invention is: a method for repairing concrete pavement using raw fiber cement-based repair materials, comprising the following steps:

Step 1. According to the site conditions, design the appropriate ratio according to the proportion range of the original fiber cement-based repair material. Before the construction starts, the ratio experiment of the cement-based composite material is carried out, and the experimental verification is carried out to obtain the optimal ratio of the cement-based composite material. mix ratio;

Step 2, the old cement concrete pavement is crushed, that is, the whole cement concrete pavement is broken into pieces by the impact equipment at one time, so that the pavement is transformed from the overall working state to the working state of the granular material combination;

Step 3: After the pavement is crushed, compact it with a Z-type road roller for 1 to 2 times. The compaction speed is not allowed to exceed 5km/h, and watering is required if necessary;

Step 4, preparing the raw fiber cement-based composite material according to the optimal mix ratio of the cement-based composite material, pouring and vibrating and smoothing;

Step 5, after 1 hour, cover the geotextile with water for maintenance.

Further, in the step 4, during pouring and vibrating and troweling, the duration of the raw fiber cement-based repair material from discharging to the end of vibrating and troweling is controlled within 20 minutes.

Further, the raw fiber cement-based repair material includes components in the following weight ratio: water 280-300kg/m ³ ; cement 310-330kg/m ³ ; fine sand 680-700kg/m ³ ; fly ash 680-700kg /m ³ ; raw fiber 24-28kg/m ³ ; water reducer 10-15kg/m ³ ; binder 0.15-0.18kg/m ³ .

Further, the cement is ordinary Portland cement with a strength of 42.5.

Further, the fine sand gradation is: the size is a square hole sieve of 1.18mm, the fine sand passing rate is 100%, the size is a square hole sieve of 0.6mm, the fine sand passing rate is 44.6%, and the size is 0.3 mm square hole sieve, the pass rate of fine sand is 10.8%, and the square hole sieve with a size of 0.15mm, the pass rate of fine sand is 0%

Further, the fly ash is Class I fly ash, the sieve residue of 45 μm is not more than 12%, the water demand ratio is not more than 95%, and the main active chemical components are SiO ₂ and Al ₂ O ₃ .

Further, the water reducer is a polycarboxylate water reducer, and its water reducing rate is greater than 20%; the binder is hydroxypropyl methylcellulose.

Further, the primary fiber has a diameter of 30-40 μm, a length of 10-20 mm, an elastic modulus of 15-30 GPa, and an elongation of 6-8%.

Further, the raw fibers include any one or more of ramie fibers, flax fibers, sisal fibers, apocynum fibers, and cotton fibers.

Further, in the step 4, the preparation of the raw fiber cement-based composite material includes the following steps: firstly, put cement, fly ash and fine sand in the mixer in sequence, and pre-stir for 2 minutes; then add the binder hydroxypropyl methyl Sprinkle the cellulose powder evenly in the pre-mixed mixture, sprinkle the powder while stirring, and stir for 5 minutes; gradually add water and water reducer to the dry mixture until a uniform mixture is produced; gradually add virgin fiber and continue mixing for 3 minutes until the fibers are evenly dispersed.

Compared with the prior art, the present invention has the following advantages:

First, because the fibers between the cracks provide bridging stress, bear load and absorb energy, the primary fiber cement-based composite material is different from ordinary concrete, and has unique strain hardening characteristics and super toughness, and its tensile strain value is greater than 3 %, significantly changed the brittle characteristics of the traditional cement concrete pavement, overcome the concrete pavement fracture and punching phenomenon caused by material brittleness, and because of its good ductility, it can have good integration with the old concrete pavement;

Second, the raw fiber cement-based composite material presents the characteristics of multiple cracks. After the first crack of the material starts to form, it will not gradually expand until it penetrates like ordinary concrete pavement. Instead, the number of cracks will continue to increase, and the width of the crack will decrease. It will not increase significantly. Finally, when the bridging stress of the fiber is not enough to generate new cracks, a certain crack locally expands to reach the ultimate strain, and the specimen will be pulled off. The width of the multi-point cracking crack in the saturated state is less than 50 μm, so its Excellent crack control ability is very beneficial to the requirement of crack width control on concrete pavement;

Third, because the original fiber in the ratio of the cement-based composite material replaces steel fiber, PVA fiber, etc. to act as a bridge, greatly reducing the cost of traditional cement-based composite materials;

Fourth, the compressive strength of the cement-based composite material reaches 35-45Mpa, and the tensile strength reaches 4-5Mpa. Its mechanical properties are good, and it meets the performance requirements of road surface repair after use.

The rapid pavement repair method of the present invention has simple on-site construction and operation, and the cement-based repair material has short setting time, high mechanical strength and fast strength increase, has strain-hardening performance and super toughness, and has the characteristics of multi-seam cracking. Repairing the damaged pavement can improve the broken board and punching phenomenon caused by the brittleness of the ordinary concrete pavement, and avoid the appearance of wide cracks. Its durability and service life are greatly improved compared with ordinary concrete, and the maintenance time is short and the traffic is fast. It is suitable for application It is used in various engineering repairs such as expressway pavement, bridge pavement, airport pavement and rural roads.

Description of drawings

Fig. 1 is the high-speed pavement structure after adopting primary fiber cement-based composite material of the present invention to repair quickly;

In the figure: 1. Repair surface layer of primary fiber cement-based composite material 2. Broken layer of old concrete slab 3. Cement stabilized crushed stone base of original cement concrete pavement 4. Graded crushed stone subbase of original cement concrete pavement.

Detailed ways

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings, but the present invention is not limited thereto.

Embodiment one

A method for repairing concrete pavements using native fiber cement-based repair materials, comprising the following steps:

Step 1. According to the climate temperature and site conditions, design the optimal mix ratio of virgin fiber cement-based composite materials before the construction starts, and conduct experiments to verify the setting time, mechanical strength, fluidity and other indicators. The mix ratio is based on the actual situation Make minor adjustments. The ratio of raw fiber cement-based materials used is: water 280kg/m ³ ; cement 310kg/m ³ ; fine sand 680kg/m ³ ; fly ash 700kg/m ³ ; virgin fiber 28kg/m ³ ; Agent 15kg/m ³ ; binder hydroxypropyl methylcellulose 0.18kg/m ³ ;

Step 2: Crushing the old cement concrete pavement, that is, breaking the whole cement concrete pavement into pieces at one time through multiple hammer heads or other types of impact equipment, so that the pavement can be transformed from the overall working state to the aggregate working state ;

Step 3: After the pavement is crushed, compact it with a Z-type road roller for 1 to 2 times, and the compaction speed is not allowed to exceed 5km/h, so as to prevent the occurrence of crushed powder due to excessive rolling. Sprinkle water when necessary to ensure the stability and flatness of the broken layer, so as to realize the transformation of the old concrete slab from the old surface layer to the new pavement base;

Step 4: Prepare raw fiber cement-based pouring materials according to the optimal mix ratio obtained from the actual test verification, in which the water-cement ratio, water reducing agent and fiber addition amount should be based on the actual situation on site and the fluidity of the raw fiber cement-based composite material Then fine-tune;

Wherein, the preparation method of the cement-based composite material when preparing the raw fiber cement-based pouring material is:

First put cement, fly ash and fine sand into the mixer in turn, and pre-mix for 2 minutes; then sprinkle the binder hydroxypropyl methylcellulose powder evenly in the pre-mixed material, and sprinkle the powder while stirring. Stir for 5 minutes; gradually add water and water reducer to the dry mixture until a uniform mixture is produced; gradually add virgin fibers and continue mixing for 3 minutes until the fibers are evenly dispersed;

Step 5: Lay the prepared raw fiber cement-based pouring material on the old concrete broken layer, and vibrate in time. The vibrating rod should be plug-in type, and the vibration should be uniform and sufficient, because fibers are added to the pouring material. Cause fluidity to be poorer than ordinary concrete, and in order to pursue strength, the concrete material water-ash of the present invention is relatively small, so the vibrating process is very important, after the vibrating is finished, the pouring material is touched with a touch knife;

Step 6: According to the ambient temperature, the geotextile can be laid and watered for maintenance about 1 hour after the concrete is poured, and it can be opened to traffic after 4 to 6 hours.

In this embodiment, in the step 5, during pouring and vibrating and troweling, the duration of the virgin fiber cement-based repair material from discharging to the end of vibrating and troweling is controlled within 10 minutes.

In this embodiment, the cement is ordinary Portland cement with a strength of 42.5.

In the present embodiment, the fine sand gradation is as follows: a square hole sieve with a size of 1.18mm, the fine sand passing rate is 100%, a square hole sieve with a size of 0.6mm, the fine sand passing rate is 44.6%, and the fine sand passing rate is 100%. 0.3mm square hole sieve, fine sand passing rate is 10.8%, and 0.15mm square hole sieve, fine sand passing rate is 0%

In this example, the fly ash is Class I fly ash, the sieve residue of 45 μm is not more than 12%, the water demand ratio is not more than 95%, the main active chemical components are SiO ₂ and Al ₂ O ₃ , and cement water The calcium hydroxide produced by chemical reaction can react to form a gelled product, which plays the role of densely filling concrete.

In this embodiment, the water reducer is a polycarboxylate water reducer with a water reducing rate greater than 20%. Its function is to disperse cement particles through surface physical and chemical effects, thereby improving the fluidity of the matrix and reducing water consumption.

In this embodiment, the binder is hydroxypropyl methyl cellulose, its role is to improve the dispersibility of cement-sand, greatly improve the plasticity and water retention of mortar, have an effect on preventing cracks, and enhance the strength of cement .

In this embodiment, the primary fiber has a diameter of 30-40 μm, a length of 10-20 mm, an elastic modulus of 15-30 GPa, and an elongation of 6-8%.

In this embodiment, the raw fibers are ramie fibers.

Embodiment two

A method for repairing concrete pavements using native fiber cement-based repair materials, comprising the following steps:

Step 1. According to the climate temperature and site conditions, design the optimal mix ratio of virgin fiber cement-based composite materials before the construction starts, and conduct experiments to verify the setting time, mechanical strength, fluidity and other indicators. The mix ratio is based on the actual situation Make minor adjustments. The ratio of raw fiber cement-based materials used is: water 290kg/m ³ ; cement 320kg/m ³ ; fine sand 690kg/m ³ ; fly ash 690kg/m ³ ; virgin fiber 26kg/m ³ ; Agent 12kg/m ³ ; binder hydroxypropyl methylcellulose 0.16kg/m ³ ;

Step 2: Crushing the old cement concrete pavement, that is, breaking the whole cement concrete pavement into pieces at one time through multiple hammer heads or other types of impact equipment, so that the pavement can be transformed from the overall working state to the aggregate working state ;

Step 3: After the pavement is crushed, compact it with a Z-type road roller for 1 to 2 times, and the compaction speed is not allowed to exceed 5km/h, so as to prevent the occurrence of crushed powder due to excessive rolling. Sprinkle water when necessary to ensure the stability and flatness of the broken layer, so as to realize the transformation of the old concrete slab from the old surface layer to the new pavement base;

Step 4: Prepare raw fiber cement-based pouring materials according to the optimal mix ratio obtained from the actual test verification, in which the water-cement ratio, water reducing agent and fiber addition amount should be based on the actual situation on site and the fluidity of the raw fiber cement-based composite material Then fine-tune;

Wherein, the preparation method of the cement-based composite material when preparing the raw fiber cement-based pouring material is:

First put cement, fly ash and fine sand into the mixer in turn, and pre-mix for 2 minutes; then sprinkle the binder hydroxypropyl methylcellulose powder evenly in the pre-mixed material, and sprinkle the powder while stirring. Stir for 5 minutes; gradually add water and water reducer to the dry mixture until a uniform mixture is produced; gradually add virgin fibers and continue mixing for 3 minutes until the fibers are evenly dispersed;

Step 5: Lay the prepared raw fiber cement-based pouring material on the old concrete broken layer, and vibrate in time. The vibrating rod should be plug-in type, and the vibration should be uniform and sufficient, because fibers are added to the pouring material. Cause fluidity to be poorer than ordinary concrete, and in order to pursue strength, the concrete material water-ash of the present invention is relatively small, so the vibrating process is very important, after the vibrating is finished, the pouring material is touched with a touch knife;

Step 6: According to the ambient temperature, the geotextile can be laid and watered for maintenance about 1 hour after the concrete is poured, and it can be opened to traffic after 4 to 6 hours.

In this embodiment, in the step 5, during pouring and vibrating and troweling, the duration of the primary fiber cement-based repair material from discharging to the end of vibrating and troweling is controlled within 15 minutes.

In this embodiment, the cement is ordinary Portland cement with a strength of 42.5.

In the present embodiment, the fine sand gradation is as follows: a square hole sieve with a size of 1.18mm, the fine sand passing rate is 100%, a square hole sieve with a size of 0.6mm, the fine sand passing rate is 44.6%, and the fine sand passing rate is 100%. 0.3mm square hole sieve, fine sand passing rate is 10.8%, and 0.15mm square hole sieve, fine sand passing rate is 0%

In this example, the fly ash is Class I fly ash, the sieve residue of 45 μm is not more than 12%, the water demand ratio is not more than 95%, the main active chemical components are SiO ₂ and Al ₂ O ₃ , and cement water The calcium hydroxide produced by chemical reaction can react to form a gelled product, which plays the role of densely filling concrete.

In this embodiment, the water reducer is a polycarboxylate water reducer with a water reducing rate greater than 20%. Its function is to disperse cement particles through surface physical and chemical effects, thereby improving the fluidity of the matrix and reducing water consumption.

In this embodiment, the binder is hydroxypropyl methyl cellulose, its role is to improve the dispersibility of cement-sand, greatly improve the plasticity and water retention of mortar, have an effect on preventing cracks, and enhance the strength of cement .

In this embodiment, the primary fiber has a diameter of 30-40 μm, a length of 10-20 mm, an elastic modulus of 15-30 GPa, and an elongation of 6-8%.

In this embodiment, the primary fiber is any one or more of ramie fiber, flax fiber and sisal fiber.

Embodiment three

A method for repairing concrete pavements using native fiber cement-based repair materials, comprising the following steps:

Step 1. According to the climate temperature and site conditions, design the optimal mix ratio of virgin fiber cement-based composite materials before the construction starts, and conduct experiments to verify the setting time, mechanical strength, fluidity and other indicators. The mix ratio is based on the actual situation Make minor adjustments. The ratio of raw fiber cement-based materials used is: water 280kg/m ³ ; cement 310kg/m ³ ; fine sand 680kg/m ³ ; fly ash 680kg/m ³ ; virgin fiber 24kg/m ³ ; Agent 10kg/m ³ ; binder hydroxypropyl methylcellulose 0.15kg/m ³ ;

Step 2: Crushing the old cement concrete pavement, that is, breaking the whole cement concrete pavement into pieces at one time through multiple hammer heads or other types of impact equipment, so that the pavement can be transformed from the overall working state to the aggregate working state ;

Step 3: After the pavement is crushed, compact it with a Z-type road roller for 1 to 2 times, and the compaction speed is not allowed to exceed 5km/h, so as to prevent the occurrence of crushed powder due to excessive rolling. Sprinkle water when necessary to ensure the stability and flatness of the broken layer, so as to realize the transformation of the old concrete slab from the old surface layer to the new pavement base;

Step 4: Prepare raw fiber cement-based pouring materials according to the optimal mix ratio obtained from the actual test verification, in which the water-cement ratio, water reducing agent and fiber addition amount should be based on the actual situation on site and the fluidity of the raw fiber cement-based composite material Then fine-tune;

Wherein, the preparation method of the cement-based composite material when preparing the raw fiber cement-based pouring material is:

First put cement, fly ash and fine sand into the mixer in turn, and pre-mix for 2 minutes; then sprinkle the binder hydroxypropyl methylcellulose powder evenly in the pre-mixed material, and sprinkle the powder while stirring. Stir for 5 minutes; gradually add water and water reducer to the dry mixture until a uniform mixture is produced; gradually add virgin fibers and continue mixing for 3 minutes until the fibers are evenly dispersed;

Step 5: Lay the prepared raw fiber cement-based pouring material on the old concrete broken layer, and vibrate in time. The vibrating rod should be plug-in type, and the vibration should be uniform and sufficient, because fibers are added to the pouring material. Cause fluidity to be poorer than ordinary concrete, and in order to pursue strength, the concrete material water-ash of the present invention is relatively small, so the vibrating process is very important, after the vibrating is finished, the pouring material is touched with a touch knife;

Step 6: According to the ambient temperature, the geotextile can be laid and watered for maintenance about 1 hour after the concrete is poured, and it can be opened to traffic after 4 to 6 hours.

In this embodiment, in the step 5, during pouring and vibrating and troweling, the duration of the primary fiber cement-based repair material from discharging to the end of vibrating and troweling is controlled within 20 minutes.

In this embodiment, the cement is ordinary Portland cement with a strength of 42.5.

In the present embodiment, the fine sand gradation is as follows: a square hole sieve with a size of 1.18mm, the fine sand passing rate is 100%, a square hole sieve with a size of 0.6mm, the fine sand passing rate is 44.6%, and the fine sand passing rate is 100%. 0.3mm square hole sieve, fine sand passing rate is 10.8%, and 0.15mm square hole sieve, fine sand passing rate is 0%

In this example, the fly ash is Class I fly ash, the sieve residue of 45 μm is not more than 12%, the water demand ratio is not more than 95%, the main active chemical components are SiO ₂ and Al ₂ O ₃ , and cement water The calcium hydroxide produced by chemical reaction can react to form a gelled product, which plays the role of densely filling concrete.

In this embodiment, the water reducer is a polycarboxylate water reducer with a water reducing rate greater than 20%. Its function is to disperse cement particles through surface physical and chemical effects, thereby improving the fluidity of the matrix and reducing water consumption.

In this embodiment, the binder is hydroxypropyl methyl cellulose, its role is to improve the dispersibility of cement-sand, greatly improve the plasticity and water retention of mortar, have an effect on preventing cracks, and enhance the strength of cement .

In this embodiment, the primary fiber has a diameter of 30-40 μm, a length of 10-20 mm, an elastic modulus of 15-30 GPa, and an elongation of 6-8%.

In this embodiment, the raw fibers include any one or more of ramie fibers, flax fibers, sisal fibers, apocynum fibers, and cotton fibers.

The high-speed pavement structure after repairing by the above method includes the original cement concrete pavement graded gravel subbase, the original cement concrete pavement cement stabilized gravel base, and the broken layer of the old concrete slab arranged sequentially from bottom to top. The upper side of the broken layer is laid with a repair surface layer of native fiber cement-based composite material. The thickness of the graded crushed stone subbase of the former cement concrete pavement is 20cm, the thickness of the cement stabilized crushed stone substrate of the former cement concrete pavement is 20cm, and the thickness of the broken layer of the old concrete slab depends on the actual surface layer of the repaired road section on site Thickness, the thickness of the repair surface layer of the native fiber cement-based composite material is 20cm.

The above is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the teachings of the present invention, a different form of raw fiber cement-based composite material and its construction for quick repair of road surface have been designed. The method does not require creative work, and all equivalent changes, modifications, replacements and modifications made according to the scope of the patent application of the present invention without departing from the principle and spirit of the present invention shall fall within the scope of the present invention.

Claims (9)

1. a kind of method for repairing concrete road surface using protofibre cement based patching material, which is characterized in that including following Step:

Step 1, according to field condition, according to the suitable proportion of proportional region design of protofibre cement based patching material, apply Work first carries out the proportioning test of cement-base composite material before starting, and carries out experimental verification, obtains cement-base composite material Optimum mix proportion；

Step 2, Old cement concrete rubblization is disposably broken integral cement concrete flag by impact device Broken is fragment, makes road deck by overall work condition conversion pellet class combination working condition；

Step 3, it after the completion of pavement breaking, is compacted 1~2 time with Z-type road roller, compaction rate does not allow more than 5km/h, necessary When need sprinkler operation；

Step 4, protofibre cement-base composite material is prepared according to the optimum mix proportion of cement-base composite material, pour and vibrated It smoothes out；

Step 5, blinding work cloth sprinkling maintenance is carried out after 1 hour.

2. a kind of method for repairing concrete road surface using protofibre cement based patching material according to claim 1, It is characterized in that, in the step 4, pours and vibrate when smoothing out, protofibre cement based patching material is tied from discharging to vibrating Beam and smooth out duration control within 20 minutes.

3. a kind of side for repairing concrete road surface using protofibre cement based patching material according to claim 1 or 2 Method, which is characterized in that the protofibre cement based patching material includes the component of following weight ratio: water 280-300kg/m³； Cement 310-330kg/m³；Fine sand 680-700kg/m³；Flyash 680-700kg/m³；Protofibre 24-28kg/m³；Water-reducing agent 10-15kg/m³；Adhesive 0.15-0.18kg/m³。

4. a kind of method for repairing concrete road surface using protofibre cement based patching material according to claim 3, It is characterized in that, the ordinary portland cement that the cement is 42.5 grades of intensity.

5. a kind of method for repairing concrete road surface using protofibre cement based patching material according to claim 3, It is characterized in that, the fine sand gradation are as follows: the square hole screen having a size of 1.18mm, fine sand percent of pass is 100%, having a size of 0.6mm's Square hole screen, fine sand percent of pass are 44 .6%, and the square hole screen having a size of 0.3mm, fine sand percent of pass is 10.8%, having a size of 0.15mm Square hole screen, fine sand percent of pass be 0%

A kind of method for repairing concrete road surface using protofibre cement based patching material according to claim 3, It is characterized in that, the flyash is I grade of flyash, and 45 μm of screen over-sizes are not more than 12%, and water demand ratio is not more than 95%, chief active Chemical component is SiO₂With Al₂O₃。

6. a kind of method for repairing concrete road surface using protofibre cement based patching material according to claim 3, It is characterized in that, the water-reducing agent is polycarboxylate water-reducer, water-reducing rate is greater than 20%；Described adhesive is that hydroxypropyl methyl is fine Dimension element.

7. a kind of method for repairing concrete road surface using protofibre cement based patching material according to claim 3, It is characterized in that, the diameter of the protofibre is 30 ~ 40 μm, length is 10 ~ 20mm, and elasticity modulus is 15 ~ 30GPa, is extended Rate is 6 ~ 8%.

8. a kind of side for repairing concrete road surface using protofibre cement based patching material according to claim 3 or 8 Method, which is characterized in that the protofibre include ramee, flax fiber, sisal fiber, apocynum fibre, in cotton fiber Any one or a few.

9. according to claim 1, a kind of described in 2,4,5,6,7 or 8 repair coagulation using protofibre cement based patching material The method of soil surface, which is characterized in that in the step 4, the preparation of protofibre cement-base composite material the following steps are included: Cement, flyash and fine sand are successively put into first in blender, stir 2min in advance；Then by adhesive hydroxypropyl methyl fiber Plain powder is uniformly sprinkled upon in the spice through stirring in advance, and 5min is stirred at the end of powder while stirring；Water and water-reducing agent are gradually added into In dry mixture, until generating uniform mixture；It is gradually added into protofibre and is further continued for mixing 3min, until fiber uniformly divides It dissipates.