CN117185713A - Airport drainage ditch slope concrete and preparation method and construction method thereof - Google Patents

Abstract

The application relates to airport drainage ditch slope concrete in the technical field of concrete preparation, which comprises the following components in parts by weight: 95-105 parts of cement, 30-35 parts of fly ash, 25-30 parts of slag, 450-458 parts of machine-made sand, 485-495 parts of broken stone, 1-2 parts of air-entraining water reducer, 7-9 parts of accelerator, 35-40 parts of hydrophobic auxiliary agent and 65-70 parts of water; the hydrophobic auxiliary agent comprises the following components in percentage by mass: (0.6-0.8) a hydrophobic mineral powder and a hydrophobically modified plant fiber; the treatment method of the hydrophobically modified plant fiber comprises the following steps: firstly, carrying out hydrophobic treatment on plant fibers to obtain hydrophobic plant fibers, wherein the hydrophobic contact angle of the hydrophobic plant fibers is 90-150 degrees; and then carrying out surface roughness modification treatment on the hydrophobic plant fiber to obtain the hydrophobic modified plant fiber. The application has the effect of improving the shape quality and the safety performance of the airport trapezoid open trench body.

Description

A kind of airport drainage ditch slope concrete and its preparation method and construction method

Technical field

The present application relates to the field of concrete preparation technology, and in particular to an airport drainage ditch slope concrete and its preparation method and construction method.

Background technique

The airport's trapezoidal open ditch drainage ditch body needs to be poured with concrete on the slope. The trapezoidal open ditch ditch body has the characteristics of steep slope (slope ratio 1:1) and thin thickness (20cm). Traditional concrete is usually made by adding cement, fly ash, machine-made sand, gravel and water into a mixing tank to form concrete. Cement and fly ash are used as gel materials. Cement reacts with water to allow concrete to solidify. Fly ash can improve concrete, making it easier to pump and pour. Machine-made sand and gravel can improve the compression resistance of concrete. strength.

Because when pouring in some flat locations, the concrete needs to have good fluidity for self-leveling to form a flatter concrete layer, so the fluidity required for traditional concrete is usually greater. When traditional concrete is used to pour airport drainage ditch slopes, due to the characteristics of the trapezoidal open ditch body with steep slope and thin thickness, the concrete has good fluidity and is easily affected by gravity to flow along the slope. In addition, the concrete itself takes a long time to set. The relatively long length results in poor morphological quality of the final airport drainage ditch slope.

Moreover, because the concrete on the slope of the trapezoidal open ditch body has been exposed to moisture and water level changes for a long time, the cohesion between concrete particles is reduced, resulting in poor impermeability of concrete, which in turn leads to poor durability, thus affecting the airport drainage ditch. The quality of the slope has a serious impact, making it impossible to guarantee the safety performance of the airport ground near the airport's trapezoidal open ditch drainage ditch body.

Contents of the invention

In order to improve the morphological quality and safety performance of the airport trapezoidal open ditch body, this application provides an airport drainage ditch slope concrete and its preparation method and construction method.

The airport drainage ditch slope concrete provided by this application adopts the following technical solution:

An airport drainage ditch slope concrete includes the following components by weight: 95-105 parts of cement, 30-35 parts of fly ash, 25-30 parts of slag, 450-458 parts of machine-made sand, and 485-495 parts of gravel. parts, 1-2 parts of air-entraining water-reducing agent, 7-9 parts of quick-setting agent, 35-40 parts of hydrophobic additives, and 65-70 parts of water;

The hydrophobic auxiliary agent includes hydrophobic mineral powder and hydrophobic modified plant fiber with a mass ratio of 1: (0.6-0.8);

The treatment method of the hydrophobic modified plant fiber: first perform hydrophobic treatment on the plant fiber to obtain hydrophobic plant fiber. The hydrophobic contact angle of the hydrophobic plant fiber is between 90-150°; and then conduct surface roughness treatment on the hydrophobic plant fiber. Modification treatment to obtain hydrophobic modified plant fiber.

By adopting the above technical solution, the glass phase in the slag can form a microstructure in the concrete, increase the cohesion and cohesion of the concrete, thereby reducing the fluidity and setting time of the concrete to a certain extent, and improving the setting of the concrete on the slope of the airport drainage ditch. rate. Manufactured sand and gravel can increase the compressive strength of concrete. Air-entraining water-reducing agents can introduce a large number of tiny, closed bubbles into concrete and have a plasticizing effect on concrete, which can improve the durability, impermeability and other properties of concrete. The accelerating setting agent mixed into concrete can accelerate the setting and hardening of concrete and further increase the setting rate.

Hydrophobic mineral powder itself is hydrophobic. Mixing hydrophobic mineral powder into concrete can make the concrete particles have a certain degree of hydrophobicity to enhance the impermeability of open ditch concrete. However, due to the physical lubricity of the surface of hydrophobic mineral powder, the dispersion of hydrophobic mineral powder is poor. Hydrophobic mineral powder is prone to agglomeration when the particle size is small and the dosage is large, and it will increase the fluidity of concrete; and because hydrophobic mineral powder The structural strength itself is low, and the incorporation of hydrophobic mineral powder will lead to a reduction in the strength of concrete. The plant fiber itself has good dispersion. After the plant fiber is hydrophobically modified and surface roughness modified, the hydrophilicity of the plant fiber is reduced, and the surface roughness of the hydrophobically modified plant fiber obtained is The reactivity has also been improved. With the water-resistant binding properties of plant fibers and hydrophobic mineral powders and other components, the hydrophobic modified plant fibers and hydrophobic mineral powders improve the impermeability properties of concrete. At the same time, the hydrophobic modified plant fibers and hydrophobic The combination of mineral powders improves the dispersion of hydrophobic mineral powders, making them less likely to agglomerate and improving the hydrophobic stability of concrete. The combination of hydrophobic modified plant fibers and hydrophobic mineral powders can reduce the impact of hydrophobic mineral powders on the fluidity of concrete. ; The combination of hydrophobic modified plant fiber and hydrophobic mineral powder can also improve the mechanical properties of hydrophobic mineral powder in concrete to reduce the adverse effects of the addition of hydrophobic mineral powder on the strength of concrete.

By reducing the fluidity and setting time of concrete, as well as improving the impermeability and durability of concrete, the morphological quality and safety performance of airport drainage ditch slopes can be improved.

Optionally, the hydrophobic treatment steps are as follows:

The plant fibers are washed with alkali and deionized water in sequence, and then neutralized with acid solution to neutrality. Add sodium sulfite, heat to 60-70°C, and keep the temperature constant for 30-40 minutes; then add phthalic anhydride solution and raise the temperature. to 100-110°C, then add peroxidase and react for 60-80 minutes; add acrylate monomer, raise the temperature to 140-160°C, filter, wash and dry after 120-140 minutes to obtain hydrophobic plant fibers.

By adopting the above technical solution, sodium sulfite is first used to perform a sulfomethylation reaction on the lignin on the fiber surface, and then it is activated with phthalic anhydride under the catalysis of peroxidase to destroy the surface lignin structure and generate phenolic oxygen. Free radicals can be used to achieve the next step of grafting reaction with acrylate monomers. Grafting the long chains of macromolecules such as acrylate monomers on the surface of plant fibers can significantly increase the hydrophobicity of the surface of plant fibers.

Optionally, the surface roughness modification treatment steps are as follows:

Add the hydrophobic plant fiber to 4-6wt% NaOH solution, stir and raise the temperature to 150-170°C, react for 1-2 hours, filter after cooling to obtain the precipitated product, wash with deionized water after cooling, and dry to obtain the former Processing of plant fibers;

Prepare an ethanol solution of ammonia and ethanol with a pH of 7.8, add the pre-treated plant fiber, stir for 35-40 minutes, and then add 1/5 of the pre-treated plant fiber addition amount of tetraethyl orthosilicate dropwise into reactor B. medium, stir for 8-12 minutes; then add 1/5 of the amount of trimethoxysilane added to the pre-treated plant fiber, stir at room temperature for 24 hours, and obtain the precipitated product, wash it with deionized water, and dry it to obtain hydrophobic modified plant fiber.

By adopting the above technical solution, the surface roughness and active reaction sites of hydrophobic plant fibers can be improved through the above steps to effectively enhance the mechanical interlocking and interfacial bonding force between hydrophobic plant fibers and hydrophobic mineral powders and other particles.

Optionally, the hydrophobic mineral powder is selected from graphite and talc.

By adopting the above technical solution, graphite and talc powder are natural hydrophobic minerals. Graphite and talc powder are not easily wetted by water. Therefore, graphite and talc powder have good hydrophobicity and relatively low cost, and can be suitable for practical applications. application.

Optionally, the particle size range of the hydrophobic mineral powder is 6-10 μm.

By adopting the above technical solution, hydrophobic mineral powder with the above particle size range is mixed into concrete. The hydrophobic mineral powder can not only improve the hydrophobicity of concrete, but also increase the bulk density of concrete to improve the compactness of concrete and further improve the strength of concrete. Impermeability and durability.

Optionally, the particle size of the machine-made sand is 0-4.75mm.

By adopting the above technical solution, the machine-made sand in the above particle size range can better improve the plasticity of concrete, and can better increase the strength and durability of concrete.

Optional, the particle size range of gravel is 4.75-31.5mm.

By adopting the above technical solution, the gravel in the above particle size range can better fill the gaps in the concrete, increase the strength and stability of the concrete, and maintain appropriate fluidity.

Optionally, the hardness grade of the cement is 42.5R.

By adopting the above technical solution, adding 42.5R cement into the concrete can meet the load-bearing requirements of the concrete on the slope of the drainage ditch.

In the second aspect, this application provides a concrete preparation method that adopts the following technical solution:

A method for preparing concrete, including the following steps: at normal temperature, first add gravel and machine-made sand, stir for 25-35 seconds, then add cement, fly ash and mineral powder, stir for 25-35 seconds, and then add water and water-reducing agent and accelerating setting agent, stir for 40-50s, finally add hydrophobic mineral powder and hydrophobic modified plant fiber, and stir for 25-35s.

By adopting the above technical solution and through the above steps, each component can be fully mixed and carry out corresponding chemical reactions, so that the working performance, impermeability and durability of the formed concrete can meet the standards.

In the third aspect, this application provides a concrete construction method that adopts the following technical solution:

Step 1: Raw material testing;

Step 2: Calculate the weight parts of each component of cement, fly ash, slag, machine-made sand, gravel, air-entraining water-reducing agent, accelerating setting agent, hydrophobic additive and water to obtain the preliminary mix ratio;

Step 3: Adjust the workability through actual matching and testing, and correct the preliminary mix ratio to obtain the benchmark mix ratio;

Step 4: Under the premise of meeting the design strength, determine the solution with the least amount of cement, so as to further adjust the laboratory mix ratio. The weight parts of each component converted according to the laboratory mix ratio are as follows: 95-105 parts of cement, pulverized coal 30-35 parts of ash, 25-30 parts of slag, 450-458 parts of machine-made sand, 485-495 parts of gravel, 1-2 parts of air-entraining water-reducing agent, 7-9 parts of quick-setting agent, 35-40 parts of hydrophobic additives parts and 65-70 parts of water, in which the hydrophobic additives include hydrophobic mineral powder and hydrophobic modified plant fiber with a mass ratio of 1: (0.6-0.8);

Step 5: Adjust according to the moisture content of raw materials and weather conditions to obtain the construction mix ratio;

Step 6: Add the specified weight fraction of each component into the mixing plant according to the construction mix ratio and mix to obtain concrete.

By adopting the above technical solution, the above method can wait for a relatively accurate laboratory mix ratio, and adjust it according to the actual situation to obtain the construction mix ratio, which can make the concrete produced more adaptable to actual materials and environments to achieve better construction Effect.

Optionally, the accelerating setting agent is selected from one of alkaline earth metal carbonates, potassium silicate accelerating setting agents, aluminate accelerating setting agents and alkali-free liquid accelerating setting agents.

To sum up, this application includes at least one of the following beneficial technical effects:

1. Fly ash, slag and accelerator can increase the setting rate of concrete and reduce the fluidity of concrete. Air-entraining water-reducing agent, hydrophobic mineral powder and hydrophobic modified plant fiber can all improve the impermeability of concrete. , the combination of hydrophobic modified plant fiber and hydrophobic mineral powder improves the dispersion of hydrophobic mineral powder, reduces the impact of hydrophobic mineral powder on the fluidity of concrete, and improves the mechanical properties of hydrophobic mineral powder in concrete to improve the anti-permeability of concrete. performance and durability;

2.6-10μm hydrophobic mineral powder. Hydrophobic mineral powder can not only improve the hydrophobicity of concrete, but also increase the packing density of concrete to improve the compactness of concrete and further improve the impermeability and durability of concrete;

3.0-4.75mm machine-made sand can better improve the plasticity of concrete, and can better increase the strength and durability of concrete.

Detailed ways

1. Preparation example:

Hydrophobic modification treatment: 30kg of plant fibers obtained by crushing wood powder, rice husk and straw were washed once with sodium hydroxide solution, washed three times with deionized water, neutralized with phosphoric acid solution until neutral, and added In the reaction kettle; add sodium sulfite into the reaction kettle, heat to 65°C, and keep the temperature constant for 35 minutes; then add phthalic anhydride solution, heat to 105°C, then add peroxidase, react for 70 minutes; add acrylate monomers body, raise the temperature to 150°C, filter, wash and dry after 130 minutes to obtain hydrophobic plant fiber.

Surface roughness modification treatment: Prepare a 5% concentration NaOH solution in reactor A, add 30kg of hydrophobic plant fiber into the reactor, stir and raise the temperature to 160°C, react for 1 hour, cool down and then filter to obtain the precipitated product, cool Afterwards, it is washed with deionized water and dried to obtain pre-treated plant fiber;

Add a certain proportion of ammonia and ethanol to reactor B, stir evenly, then add 25kg of pre-treated plant fiber to reactor B, stir for 40 minutes, and then add 5kg of ethyl orthosilicate dropwise into reactor B. , stir for 10 minutes; then add 5 kg of trimethoxysilane, stir at room temperature for 24 hours, and obtain a precipitated product, which is washed with deionized water and dried to obtain hydrophobic modified plant fiber.

2. Embodiments

Example 1:

Concrete preparation: At normal temperature, first add 485kg gravel and 450kg machine-made sand, stir for 30s, then add 95kg cement, 30kg fly ash and 25kg slag, stir for 30s, then add 65kg water, 1kg air-entraining water-reducing agent and 7kg quick-setting agent, stir for 40s, finally add 35kg of hydrophobic additive, stir for 30s, and obtain concrete.

The hydrophobic additives include talc powder and hydrophobic modified plant fiber with a mass ratio of 1:0.7 (i.e. 20.6kg talc powder and 14.4kg hydrophobic modified plant fiber). The particle size of the talc powder is 8 μm, and the average particle size of the crushed stone is 8 μm. The average particle size of machine-made sand is 15.5mm. The air-entraining water-reducing agent is polycarboxylic acid-based air-entraining water-reducing agent, and the accelerating setting agent is potassium silicate accelerating setting agent.

Example 2-3:

A kind of airport drainage ditch slope concrete, the differences from Example 1 are shown in Table 1.

Table 1:

Example 4:

The difference between an airport drainage ditch slope concrete and Example 2 is that the hydrophobic additive is 38kg, that is, the talcum powder is 22.35kg and the hydrophobic modified plant fiber is 15.65kg.

Example 5:

A kind of airport drainage ditch slope concrete is different from Example 2 in that: the hydrophobic additive is 40kg, that is, the talcum powder is 23.5kg and the hydrophobic modified plant fiber is 16.5kg.

Example 6:

An airport drainage ditch slope concrete differs from Example 2 in that the mass ratio of talc powder and hydrophobic modified plant fiber is 1:0.6, that is, the talc powder is 23.75kg and the hydrophobic modified plant fiber is 14.25kg .

Example 7:

An airport drainage ditch slope concrete differs from Example 2 in that the mass ratio of talc powder and hydrophobic modified plant fiber is 1:0.8, that is, the talc powder is 21.1kg and the hydrophobic modified plant fiber is 16.9kg .

Example 8:

An airport drainage ditch slope concrete differs from Example 2 in that the slag content is 25kg.

Example 9:

An airport drainage ditch slope concrete differs from Example 2 in that the slag content is 30kg.

3. Comparative ratio

Comparative example 1:

An airport drainage ditch slope concrete is different from Example 2 in that equal amounts of hydrophobic additives are replaced by cement.

Comparative example 2:

An airport drainage ditch slope concrete differs from Example 2 in that the mass ratio of talcum powder and hydrophobic modified plant fiber is 1:0.4.

4. Performance testing test

1) Setting time test: According to GB/T1346-2011 "Cement standard consistency water consumption, setting time, stability test method", the initial setting and final setting requirements of the concrete prepared in Examples 1-9 and Comparative Examples 1-2 time for testing;

2) Fluidity test: According to the slump test method in GB/T50080, test the concrete specimens formed under the same curing conditions of the concrete prepared in Examples 1-9 and Comparative Examples 1-2;

3) Mechanical property test: According to GB/T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", the 28-day compressive strength of the concrete specimens formed under the same curing conditions of the concrete prepared in Examples 1-9 and Comparative Examples 1-2 was tested. test;

4) Anti-penetration and durability test: According to the water penetration height method in GB/T50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete", the concrete prepared in Examples 1-9 and Comparative Examples 1-2 were tested under the same curing conditions. The resulting concrete specimens were tested.

The above performance test results are shown in Table 2:

Table 2:

5. Result Analysis and Summary

Combining Examples 1-9 and Comparative Examples 1-2 and Table 2, it can be seen that in Examples 1-3, the time required for the initial setting and final setting of Example 2 is significantly shorter than that of Example 1, but compared with the implementation Similar to Example 3; the slump of Example 2 is significantly smaller than that of Example 1, but similar to Example 3; the compressive strength of Example 2 is higher than that of Example 1 and Example 3; the water seepage height of Example 2 is significantly lower In Example 1, but similar to Example 3. It can be seen from the above that the coagulation time required by Example 2 is significantly less than that of Example 1, but similar to Example 3. The fluidity of Example 2 is significantly less than that of Example 1, but similar to Example 3. The resistance of Example 2 is The compressive strength is higher than that of Example 1 and Example 3. The impermeability of Example 2 is obviously better than that of Example 1, but similar to Example 3.

It can be seen from this that the various raw materials and their weight parts in Example 2 can better reduce the fluidity and setting time of concrete while saving the amount of raw materials added compared to Example 1 and Example 3, and can Better improving the impermeability and durability of concrete can significantly improve the morphological quality and safety performance of airport drainage ditch slopes.

In addition, the content of the hydrophobic auxiliary agent in Example 4 is less than that in Example 2, and the content of the hydrophobic auxiliary agent in Example 5 is greater than that in Example 2. It can be seen from Table 2 that the time required for initial setting and final setting, slump, and compressive strength are not much different between Example 2 and Example 4-5. Therefore, changes in the content of hydrophobic additives have an impact on the setting time and fluidity of concrete. and little impact on compressive strength. However, it can be seen from Table 2 that the water seepage height of Example 4 is significantly greater than that of Example 2. The water seepage heights of Example 2 and Example 5 are similar. From the above, it can be seen that the impermeability of Example 4 is lower than that of Example 2. The impermeability of Example 5 is similar to that of Example 2.

And combined with Comparative Example 1, the hydrophobic additive of Comparative Example 1 was replaced by cement in equal amounts. As can be seen from Table 2, the water seepage height of Comparative Example 1 is much higher than that of Example 2, and at the same time higher than that of Examples 4-5, that is The impermeability of Comparative Example 2 is lower than that of Example 2 and Examples 4-5.

It can be seen from the above that hydrophobic additives can significantly improve the impermeability of concrete, and the content of hydrophobic additives in Example 2 is compared with Examples 4-5, which can improve the resistance of concrete while saving the amount of raw materials added. Permeability is significantly improved.

In addition, the mass ratios of hydrophobic mineral powder and hydrophobic modified plant fiber in the hydrophobic additives of Examples 6-7 are different from those of Example 2. As can be seen from Table 2, the slump of Example 6 is significantly higher than that of Example 2, and the slump of Example 7 is similar to that of Example 2; the compressive strength of Example 6 is much lower than that of Example 2. The compressive strength of Example 7 is slightly lower than that of Example 2; the water penetration height of Example 2 is lower than that of Examples 6-7. From the above, it can be seen that the fluidity of Example 2 is significantly smaller than that of Example 6, but similar to Example 7. The compressive strength of Example 2 is higher than that of Examples 6-7, and the impermeability of Example 2 is better than that of Examples 6-7.

It can be concluded that compared with Examples 6-7, the mass ratio of hydrophobic mineral powder and hydrophobic modified plant fiber in the hydrophobic additive of Example 2 can more significantly reduce the fluidity of concrete, and can more significantly improve the fluidity of concrete. The impermeability and durability of concrete can better improve the morphological quality and safety performance of the airport drainage ditch slope.

And combined with Comparative Example 1, the mass ratio of hydrophobic mineral powder and hydrophobic modified plant fiber in the hydrophobic additive of Comparative Example 1 is 1:0.4, and the proportion of hydrophobic modified plant fiber in Comparative Example 1 is lower than that of Example 2 , Examples 6-7. As can be seen from Table 2, the compressive strength of Comparative Example 2 is much lower than that of Example 2 and Examples 6-7, and the water seepage height is higher than that of Example 2. It can be seen from the above that when the mass proportion of hydrophobic mineral powder in the hydrophobic additive is high and the mass proportion of hydrophobic modified plant fiber is low, it will have a greater negative impact on the compressive strength of concrete and will also reduce the compressive strength of concrete. Permeability.

In addition, the slag content of Example 8 is lower than that of Example 2, and the slag content of Example 9 is higher than that of Example 2. It can be seen from Table 2 that the time required for the initial setting and final setting of Example 8 is much longer than that of Example 2, and the time required for the initial setting and final setting of Example 9 is similar to that of Example 2; The slump is significantly higher than that of Example 2, and the slump of Example 9 is similar to that of Example 2. It can be seen from the above that the coagulation time required by Example 2 is significantly shorter than that of Example 8, but similar to that of Example 9; the fluidity of Example 2 is significantly shorter than that of Example 8, but similar to that of Example 9.

It can be seen that compared with Examples 8-9, the slag content of Example 2 can more significantly reduce the fluidity of concrete and reduce the setting time while saving the amount of raw materials added, so as to better improve the airport. Improve the morphological quality of the drainage ditch slope and improve construction efficiency.

The above are all preferred embodiments of the present application, and do not limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application shall be covered by the protection scope of the present application. Inside.

Claims (10)

1. The airport drainage ditch slope concrete is characterized by comprising the following components in parts by weight: 95-105 parts of cement, 30-35 parts of fly ash, 25-30 parts of slag, 450-458 parts of machine-made sand, 485-495 parts of broken stone, 1-2 parts of air-entraining water reducer, 7-9 parts of accelerator, 35-40 parts of hydrophobic auxiliary agent and 65-70 parts of water;

the hydrophobic auxiliary agent comprises the following components in percentage by mass: (0.6-0.8) a hydrophobic mineral powder and a hydrophobically modified plant fiber;

the treatment method of the hydrophobically modified plant fiber comprises the following steps: firstly, carrying out hydrophobic treatment on plant fibers to obtain hydrophobic plant fibers, wherein the hydrophobic contact angle of the hydrophobic plant fibers is 90-150 degrees; and then carrying out surface roughness modification treatment on the hydrophobic plant fiber to obtain the hydrophobic modified plant fiber.

2. An airport drainage ditch slope concrete of claim 1, wherein: the hydrophobic treatment comprises the following treatment steps:

sequentially performing alkali washing and deionized water washing on the plant fibers, neutralizing to be neutral by adopting acid liquor, adding sodium sulfite, heating to 60-70 ℃, and keeping the temperature for 30-40 min; then adding phthalic anhydride solution, heating to 100-110 ℃, adding peroxidase, and reacting for 60-80 min; and adding an acrylic monomer, heating to 140-160 ℃, filtering, washing and drying after 120-140 min to obtain the hydrophobic plant fiber.

3. An airport drainage ditch slope concrete according to claim 2, wherein: the surface roughness modification treatment comprises the following treatment steps:

adding the hydrophobic plant fiber into 4-6wt% NaOH solution, stirring and heating to 150-170 ℃, reacting for 1-2h, cooling, filtering to obtain a precipitate, cooling, washing with deionized water, and drying to obtain pretreated plant fiber;

preparing ammonia water and ethanol of which the ph is 7.8, adding the pretreated plant fibers, stirring for 35-40min, dropwise adding 1/5 of ethyl orthosilicate with the addition amount of the pretreated plant fibers into a reaction kettle B, and stirring for 8-12min; adding 1/5 of trimethoxy silane for pretreatment of plant fiber, stirring at room temperature for 24h to obtain a precipitate, washing with deionized water, and drying to obtain the hydrophobically modified plant fiber.

4. An airport drainage ditch slope concrete of claim 1, wherein: the hydrophobic mineral powder is selected from one of graphite, silica fume and talc.

5. An airport drainage ditch slope concrete of claim 1, wherein: the particle size of the hydrophobic mineral powder is in the range of 6-10 mu m.

6. An airport drainage ditch slope concrete of claim 1, wherein: the grain diameter of the machine-made sand is 0-4.75mm.

7. An airport drainage ditch slope concrete of claim 1, wherein: the particle size of the crushed stone is 4.75-31.5mm.

8. An airport drainage ditch slope concrete of claim 1, wherein: the hardness grade of the cement is 42.5R.

9. A method of preparing a concrete according to any one of claims 1 to 8, comprising the steps of:

at normal temperature, firstly adding broken stone and machine-made sand, stirring for 25-35s, then adding cement, fly ash and mineral powder, stirring for 25-35s, then adding water, water reducing agent and accelerator, stirring for 40-50s, finally adding hydrophobic mineral powder and hydrophobic modified plant fiber, and stirring for 25-35s.

10. The construction method of the airport drainage ditch slope concrete is characterized by comprising the following steps of:

step 1: detecting raw materials;

step 2: the method comprises the steps of calculating the weight parts of cement, fly ash, slag, machine-made sand, broken stone, air-entraining water reducer, accelerator, hydrophobic auxiliary agent and water to obtain a preliminary mixing ratio;

step 3: through real matching and detection, workability is adjusted, and the preliminary matching proportion is corrected to obtain a reference matching proportion;

step 4: on the premise of meeting the design strength, determining the scheme with the least cement consumption, thereby further adjusting and obtaining the mixing ratio of the laboratory, and the weight parts of the components converted according to the mixing ratio of the laboratory are as follows: 95-105 parts of cement, 30-35 parts of fly ash, 25-30 parts of slag, 450-458 parts of machine-made sand, 485-495 parts of broken stone, 1-2 parts of air-entraining water reducer, 7-9 parts of accelerator, 35-40 parts of hydrophobic auxiliary agent and 65-70 parts of water, wherein the hydrophobic auxiliary agent comprises the following components in percentage by mass: (0.6-0.8) a hydrophobic mineral powder and a hydrophobically modified plant fiber;

step 5: adjusting according to the water content of the raw materials and weather conditions to obtain a construction mixing ratio;

step 6: and adding the components with the specified weight fractions into the mixing building according to the construction mixing proportion for mixing to obtain the concrete.