CN107857603B - Vegetation concrete surface sealant and method for carrying out surface treatment on vegetation concrete by using same - Google Patents
Vegetation concrete surface sealant and method for carrying out surface treatment on vegetation concrete by using same Download PDFInfo
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- CN107857603B CN107857603B CN201711242431.9A CN201711242431A CN107857603B CN 107857603 B CN107857603 B CN 107857603B CN 201711242431 A CN201711242431 A CN 201711242431A CN 107857603 B CN107857603 B CN 107857603B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/62—Coating or impregnation with organic materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
- C04B41/4857—Other macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Inorganic Chemistry (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a vegetation concrete surface sealant and a method for carrying out surface treatment on vegetation concrete by using the same. The vegetation concrete surface sealant comprises the following components in percentage by mass: acrylic emulsion: 50-60%, thickening agent: 3-5%, the balance being water, the viscosity of the sealant being 25-30 s; after the sealing agent is uniformly sprayed on the surface of vegetation concrete for a period of time, the alkalinity value and the compressive strength of the surface of the vegetation concrete are tested, and compared with the condition before spraying treatment, researches show that the sealing agent can not only effectively reduce the alkalinity of the surface of the vegetation concrete, but also does not influence the performances of the vegetation concrete, such as the compressive strength and the like, and the sealing agent has better application prospect in the field of building materials as a slope protection protective material.
Description
Technical Field
The invention relates to a concrete surface sealant, belongs to the technical field of building materials, and particularly relates to a vegetation concrete surface sealant and a method for carrying out surface treatment on vegetation concrete by using the same.
Background
Porous vegetation concrete can enough adapt to vegetation, possesses the novel slope protection material of bank protection function again, and it possesses the same high intensity with ordinary concrete relatively, and the durability, makes holistic protective capacities improve 2 ~ 3 times together with the plant roots who grows up simultaneously, consequently has very important meaning to the research of porous vegetation concrete.
However, in China, ordinary portland cement is usually adopted to produce porous concrete, and the ordinary portland cement is easy to generate soluble alkali and insoluble alkali in the process of cementing, wherein soluble alkali such as sodium carbonate and sodium bicarbonate can decompose and escape amine nitrogen fertilizer, so that elements required by plants are out of balance, which is not beneficial to the healthy growth of the plants, meanwhile, the soluble alkali enables the pH value in concrete pores to be as high as 12-13, and the suitable pH value for the growth of common slope protection plants is generally between 5.5-9.5, so that if the plants are successfully planted in the porous vegetation concrete, the technical problem of overhigh alkalinity in the pores must be solved.
The existing solution method comprises the steps of changing the composition of a cementing material, improving the alkalinity in gaps by using weakly acidic soil, performing surface treatment and the like, wherein the method for changing the composition of the cementing material essentially solves the problem of high alkalinity of porous vegetation concrete, and has the defect that the composition of the cementing material is changed on the basis of ensuring the stability of a concrete structure, so that the alkalinity is not greatly reduced, but the concrete strength is influenced; the method for improving the alkalinity in the gaps by using the weakly acidic soil has a certain influence on the alkalinity in the pores of the porous concrete, specifically, the early alkalinity of the concrete is reduced after the pores are filled in the weakly acidic soil, but the alkalinity value is gradually increased along with the increase of time, and meanwhile, the long-term strength of the concrete is influenced by using the weakly acidic soil. The surface treatment method is that a layer of film is formed on the surface cementing material of concrete pores to isolate the contact of alkali substances and soil filled in the pores and prevent the alkali substances from dissolving into the soil in the pores, so that the pH value in the concrete pores can be kept in a reasonable range, the soil is neutral, and the salinity and alkalinity of the soil can not be increased along with the prolonging of time.
The surface treatment material is more in variety, but two technical requirements must be met, namely, a compact and uniform film can be formed, and the film has certain strength, such as epoxy resin, emulsified asphalt and the like, which can be used as a good surface treatment material. Secondly, the surface treatment material should satisfy the requirement of having a small influence on the properties of the concrete such as strength, durability, porosity and the like.
For example, Chinese patent application (application publication No. CN103408243A, application publication No. 2013-11-27) discloses a plant-growing concrete alkaline inhibitor, which consists of 35-60% of high molecular polymer, 15-40% of permeable crystalline material and 20-30% of organosilicon hydrophobic material. After the high molecular polymer is doped, the polymer particles are dissolved in water to form a dispersion system, a high molecular film layer is formed on the surfaces of the cement particles and the concrete, and alkaline substances generated by cement hydration are wrapped, so that the diffusion of the alkaline substances to surface soil is reduced, and the growth of plants is not influenced by the too high alkalinity of the soil. The permeable crystallization material is added into concrete and reacts with cement hydrated educt to generate gel and crystal, which fills fine gap in cement mortar to block and cut off capillary passage, thus inhibiting the passage of alkali substance diffusing to concrete surface and reducing the alkalization risk of soil. The organic silicon hydrophobic material is added, so that the plant-growing concrete can form a hydrophobic body, the diffusion of water to the interior of the concrete can be obviously inhibited, the reduction of the water in the concrete enables alkaline substances to be separated out and lack solute carriers, and the diffusion of the alkaline substances to the soil can be inhibited. The plant-growing concrete alkalinity inhibitor has the advantages that the alkalinity of the surface of concrete can be reduced within a certain range, and the defects that the concrete components react with cement particles and the like in the concrete, the cementation between cement and stones and the like is influenced, and the strength, the durability and the like of the plant-growing concrete are finally influenced.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a vegetation concrete surface sealant which can effectively reduce the alkalinity of the surface of vegetation concrete and does not influence the performance of the vegetation concrete.
In order to achieve the aim, the invention discloses a vegetation concrete surface sealant which comprises the following chemical components in percentage by mass: acrylic emulsion: 50-60%, thickening agent: 3-5% of water, and the balance of water, wherein the viscosity of the sealant is 25-35 s.
Further, the solid content of the acrylic emulsion is 35-37%, and the viscosity is 500-800 mPa & s at the temperature of 20 ℃.
Still further, the specific gravity of the acrylic emulsion is 1.1g/cm3And the pH value of the acrylic emulsion is 7-9.
Further, the thickener is one of polyacrylamide, carboxymethyl cellulose or a gum mixture, and the gum mixture is one selected from carrageenan, gelatin, xanthan gum, locust bean gum and guar gum.
Preferably, the average relative molecular mass of the gum mixture is 2 × 106～1.5×107(ii) a The viscosity is 250 to 350 pas at a temperature of 20 ℃.
The invention also discloses a method for surface treatment of vegetation concrete by adopting the sealant, which comprises the following steps:
1) forming vegetation concrete: adding pre-prepared vegetation concrete into a concrete test mould, inserting and tamping for a plurality of times, then placing the concrete on a vibrating table for vibration treatment, and finally vibrating to prepare massive vegetation concrete;
2) and (3) maintenance of vegetation concrete: sealing the block vegetation concrete prepared in the step 1), and then placing the block vegetation concrete into a curing room for standard curing;
3) surface treatment of vegetation concrete: adopt the spraying device to be in the surface of the good cubic vegetation concrete of step 2) maintenance carries out the even spraying sealant, the viscosity of sealant is 25 ~ 30s, the thickness of cubic vegetation concrete is 10 ~ 15cm the surface and the inside of cubic vegetation concrete all form the film that thickness is 1 ~ 2mm, treat the spraying and finish the back, place 24 ~ 48 h.
Preferably, in the step 1), the vegetation concrete prepared in advance is prepared by adopting stones, cement, water and a water reducing agent in a certain proportion, and the specific preparation process comprises the following steps: uniformly stirring 80-83% of stones and water, adding 10-16% of cement, and stirring to obtain a mixture; uniformly mixing a water reducing agent with the mass percent of 0.05-0.10% with water to obtain a water reducing agent solution, slowly adding the prepared water reducing agent solution into the mixture, stirring until the surface of the obtained emulsion presents relatively obvious metallic luster, and stopping stirring to obtain vegetation concrete emulsion, wherein the water, the pebbles, the cement and the water reducing agent form one hundred percent of content;
preferably, the stones are basalt broken stones with the particle size of 10-20 mm, the cement is 425-grade ordinary portland cement, and the water reducing agent is a polycarboxylic acid water reducing agent.
Preferably, in the step 1), the prepared vegetation concrete emulsion is filled into a concrete test mold with length, width and height of 150mm, 150mm and 150mm in two layers, each layer is inserted and tamped for a plurality of times by using an inserting and tamping rod, then the concrete test mold is placed on a vibrating table for vibration treatment for 5-15 s, and finally a flat plate type concrete vibrator is continuously adopted to vibrate vegetation concrete until the vegetation concrete is molded, so that the block vegetation concrete is obtained.
Preferably, in the step 2), the block-shaped vegetation concrete prepared in the step 1) is sealed by a plastic film and then is placed into a curing room for standard curing for 7-28 d, and then the compressive strength of the prepared concrete is tested, wherein the compressive strength range of the concrete is 5-22 MPa.
In order to determine the surface alkalinity of the vegetation concrete cured in the step 2), the specific operation process comprises the following steps: adding 5.8kg of water into a bucket with the diameter of 20cm, then putting the vegetation concrete cured in the step 2) into the bucket, wherein the water exceeds the surface of the vegetation concrete, and measuring the pH value of the water solution by using a precision pH meter after soaking for 24 hours. Replacing the water buckets with the same volume and the same weight of water, repeating the steps until the pH value of the aqueous solution is stable and unchanged, and stopping measuring to obtain the alkaline pH value of the surface of the vegetation concrete before treatment1A value;
similarly, the alkaline pH of the vegetation concrete surface treated by the sealing agent is measured by the same alkaline measuring method2The value is obtained.
Preferably, in the step 3), the pressure of the spraying device is 0.4-0.5 MPa, and the running speed of the spraying device is controlled at 5-10 cm/s.
Preferably, in the step 3), the content of the sealant in percentage by mass of the massive vegetation concrete is less than or equal to 10%, but the content is not zero.
Preferably, the spray coating device is a polyurethane spray coating device with the model number of JNJX-Q5200.
Principle of surface treatment: the thickness of the blocky concrete and the viscosity of the sealant are controlled, the sealant is sprayed on the surface of the blocky concrete by adopting a spraying device, part of the sealant permeates into the inner gap of the concrete to form a film with a certain thickness, and part of the sealant forms the film with a certain thickness on the surface of the concrete, so that the film can isolate alkali substances in the concrete from contacting with soil filled in the gap, and prevent the alkali substances from dissolving into the soil in the hole, therefore, the pH value in the gap of the concrete can be kept in a reasonable range, and nutrient substances in the soil can also stably exist, and plants can naturally and normally grow.
Has the advantages that:
1. the vegetation concrete surface sealant disclosed by the invention forms a film on the surface of concrete and in the gap, so that the contact between alkali substances in the concrete and soil filled in the gap can be effectively isolated, the pH value in the concrete gap is kept in a reasonable range, the performances such as compressive strength and the like of the concrete cannot be influenced by a simple physical isolation effect, and the durability of the concrete is ensured.
2. The vegetation concrete surface sealant disclosed by the invention reduces the influence of alkaline substances in concrete, so that the influence of more soil for neutralizing the alkaline substances (the conventional soil is weakly acidic) is not required to be additionally increased, and good vegetation growth can be ensured.
3. Compared with the existing epoxy resin, the vegetation concrete surface sealant has comparable treatment effect, easily obtained raw materials and moderate price, and is suitable for treating the vegetation concrete surface in large batch.
Detailed Description
In order to better explain the invention, the following further illustrate the main content of the invention in connection with specific examples, but the content of the invention is not limited to the following examples.
Example 1
The sealant prepared in the embodiment comprises the following components in percentage by mass: 60% of acrylic emulsion; 3% of a thickening agent; 37% of water, wherein the viscosity of the sealant is 28 s; the solid content of the acrylic emulsion is 35%, and the viscosity is 500mPa & s at the temperature of 20 ℃; the specific gravity of the acrylic emulsion is 1.1g/cm3The pH value of the acrylic emulsion is 7; the thickening agent is polyacrylamide.
The preparation process of the sealant of this example is as follows: under the production condition of 25 ℃, adding 37% of water by mass into production equipment, controlling the rotating speed of a stirrer to be about 1000r/min, slowly adding 3% of polyacrylamide by mass, stirring for about 5min, adjusting the rotating speed of the stirrer to be 500r/min, then adding 60% of acrylic emulsion by mass, and stirring until the product is uniformly dispersed and has no bubbles or particles, thereby preparing the sealant with the viscosity of 28 s.
The preparation process of the vegetation concrete of the embodiment comprises the following steps:
mixing 270kg of 425-grade ordinary portland cement, 1600kg of basalt broken stone with the particle size of 10-20 mm, 81kg of water and 1.62kg of polycarboxylic acid water reducing agent, uniformly stirring to obtain vegetation concrete emulsion, forming and curing for 28 days to obtain vegetation concrete with the compressive strength of 12.5MPa, and measuring the surface alkaline pH1A value of 12.44;
the sealing agent prepared by the embodiment is used for treating the surface of vegetation concrete, and the specific treatment process is as follows: uniformly spraying the sealing agent with viscosity of 28s on the surface to obtain pH value1The method comprises the steps of controlling the pressure of a spraying device to be 0.4-0.5 MPa on a massive vegetation concrete surface with the value of 12.44 and the thickness of 12cm, controlling the running speed of the spraying device to be 5-6 cm/s, enabling the surface and the interior of the concrete to form a film with the thickness of 1-2 mm, after spraying, curing a sealant on the surface of the vegetation concrete for 48 hours, and testing the surface alkalinity pH of the vegetation concrete again2Values, table 1 is obtained:
TABLE 1 Properties of vegetation concrete before and after treatment List (I)
Example 2
The sealant prepared in the embodiment comprises the following components in percentage by mass: 50% of acrylic emulsion; 4% of a thickening agent; 46% of water, wherein the viscosity of the sealant is 32 s; the solid content of the acrylic emulsion is 36%, and the viscosity is 650mPa & s at the temperature of 20 ℃; the specific gravity of the acrylic emulsion is 1.1g/cm3The pH value of the acrylic emulsion is 8; the thickening agent is carboxymethyl cellulose.
The preparation process of the sealant of this example is as follows: under the production condition of 25 ℃, adding 46% of water by mass into production equipment, controlling the rotating speed of a stirrer to be about 1000r/min, slowly adding 4% of carboxymethyl cellulose by mass, stirring for about 5min, adjusting the rotating speed of the stirrer to be 500r/min, then adding 50% of acrylic emulsion by mass, and stirring until the product is uniformly dispersed and has no bubbles or particles, thereby preparing the sealant with the viscosity of 32 s.
The preparation process of the vegetation concrete of the embodiment comprises the following steps:
mixing 240kg of 425-grade ordinary portland cement, 1660kg of basalt broken stone with the particle size of 10-20 mm, 72kg of water and 1.44kg of polycarboxylic acid water reducing agent, uniformly stirring to obtain vegetation concrete emulsion, forming and curing for 7d to obtain vegetation concrete with the compressive strength of 7.58MPa, and measuring the surface alkaline pH1A value of 12.28;
the sealing agent prepared by the embodiment is used for treating the surface of vegetation concrete, and the specific treatment process is as follows: uniformly spraying the sealant with viscosity of 26s on the surface to obtain a pH value1The method comprises the steps of controlling the pressure of a spraying device to be 0.4-0.5 MPa on the massive vegetation concrete surface with the value of 12.28 and the thickness of 10cm, controlling the running speed of the spraying device to be 7-8 cm/s, enabling the surface and the interior of the concrete to form a film with the thickness of 1-2 mm, after spraying is finished, curing a sealant on the surface of the vegetation concrete for 48 hours, and testing vegetation concrete againAlkaline pH of surface of concrete2Values, table 2 is obtained:
TABLE 2 Properties of vegetation concrete before and after treatment List (II)
Example 3
The sealant prepared in the embodiment comprises the following components in percentage by mass: 55% of acrylic emulsion; 5% of a thickening agent; 40% of water, wherein the viscosity of the sealant is 35 s; the solid content of the acrylic emulsion is 37%, and the viscosity is 700mPa & s at the temperature of 20 ℃; the specific gravity of the acrylic emulsion is 1.1g/cm3The pH value of the acrylic emulsion is 7.5; the thickener is gelatin, and the average relative molecular mass of the gelatin is 1.0 x 107(ii) a The viscosity was 300 pas at 20 ℃.
The preparation process of the sealant of this example is as follows: under the production condition of 25 ℃, adding 40% of water by mass into production equipment, controlling the rotating speed of a stirrer to be about 1000r/min, slowly adding 5% of carboxymethyl cellulose by mass, stirring for about 5min, adjusting the rotating speed of the stirrer to be 500r/min, then adding 55% of acrylic emulsion by mass, and stirring until the product is uniformly dispersed and has no bubbles or particles, thereby preparing the sealant with the viscosity of 35 s.
The preparation process of the vegetation concrete of the embodiment comprises the following steps:
mixing and stirring 300kg of 425-grade ordinary portland cement, 1600kg of basalt broken stone with the particle size of 10-20 mm, 90kg of water and 1.8kg of polycarboxylic acid water reducing agent uniformly to obtain vegetation concrete emulsion, forming and curing for 28 days to obtain vegetation concrete with the compressive strength of 20.68MPa, and measuring the surface alkaline pH1The value was 12.92.
The sealing agent prepared by the embodiment is used for treating the surface of vegetation concrete, and the specific treatment process is as follows: uniformly spraying the sealing agent with viscosity of 30s on the surface to obtain pH value1Value of 1292, the pressure of the spraying device is controlled to be 0.4-0.5 MPa, the running speed of the spraying device is controlled to be 7-8 cm/s, so that a thin film with the thickness of 1-2 mm is formed on the surface and the inside of the concrete, after the spraying is finished, the surface of the vegetation concrete is hardened for 24 hours by the sealant, and the surface alkalinity pH of the vegetation concrete is tested again2Values, table 3 was obtained:
TABLE 3 Properties of vegetation concrete before and after treatment List (III)
Comparative example
Taking the massive vegetation concrete of the embodiment 3, uniformly coating the sealant with the group number k in the embodiment 3, wherein the thickness of the massive vegetation concrete is 15cm, the pressure of a spraying device is controlled to be 0.4-0.5 MPa, and the running speed of the spraying device is controlled to be 5-6 cm/s, so that films with the thickness of 1-2 mm are formed on the surface and inside of the concrete, after the spraying is finished, the sealant is hardened on the surface of the vegetation concrete for 24 hours, and the surface alkalinity pH of the vegetation concrete is tested again2Value of
The vegetation concrete prepared in the embodiment 3 is uniformly coated on the surface by adopting the same amount of polyurethane emulsion or epoxy resin emulsion, the thickness of the massive vegetation concrete is 15cm, the pressure of a spraying device is controlled to be 0.4-0.5 MPa, the running speed of the spraying device is controlled to be 5-6 cm/s, so that a film with the thickness of 1-2 mm is formed on the surface and the inside of the concrete, after the spraying is finished, the surface of the vegetation concrete is hardened for 24 hours by using a sealant, and the surface alkalinity pH of the vegetation concrete is tested again2A value; table 4 was obtained:
TABLE 4 tabulation of the properties of the comparative examples after treatment of the vegetation concrete
As can be seen from tables 1 to 3 of the above examples, after the surface treatment of the vegetation concrete by using the sealant of the present invention, the surface alkalinity of the vegetation concrete is effectively reduced, the surface alkalinity of the vegetation concrete is reduced to Ph 7 to 10, and the more the amount of the sealant is added, the more the reduction is obvious.
Meanwhile, the compressive strength of the vegetation concrete is not influenced by the sealant, and conversely, the compressive strength of the vegetation concrete is slightly increased for a period of time after the sealant is coated.
Compared with the common epoxy resin used as the vegetation concrete surface sealant, the sealant can almost achieve the same effect of reducing the surface alkalinity and not influencing the compression resistance of concrete.
Compared with the common concrete surface treatment coating such as polyurethane emulsion, the sealant disclosed by the invention has more remarkable effect on reducing the alkalinity value of the vegetation concrete surface by doping the same amount.
The above examples are merely preferred examples and are not intended to limit the embodiments of the present invention. In addition to the above embodiments, the present invention has other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (4)
1. A vegetation concrete surface sealant is characterized in that: the composite material comprises the following components in percentage by mass: acrylic emulsion: 50-60%, thickening agent: 3-5% of water, and the balance of water, wherein the viscosity of the sealant is 25-30 s;
the solid content of the acrylic emulsion is 35-37%, and the viscosity is 500-800 mPa & s at the temperature of 20 ℃;
the specific gravity of the acrylic emulsion is 1.1g/cm3The pH value of the acrylic emulsion is 7-9;
the thickening agent is one of polyacrylamide, carboxymethyl cellulose or a glue mixture;
the average relative molecular mass of the gum mixture is 2X 106～1.5×107(ii) a And when the temperature is 20 ℃, the viscosity of the glue mixture is 250-350 Pa.s.
2. A method of surface treating vegetation concrete with the sealant according to claim 1, wherein the method comprises the steps of: it comprises the following steps:
1) forming vegetation concrete: adding pre-prepared vegetation concrete into a concrete test mould, inserting and tamping for a plurality of times, then placing the concrete on a vibrating table for vibration treatment, and finally vibrating to prepare massive vegetation concrete;
2) and (3) maintenance of vegetation concrete: sealing the block vegetation concrete prepared in the step 1), and then placing the block vegetation concrete into a curing room for standard curing;
3) surface treatment of vegetation concrete: uniformly spraying a sealant on the surface of the block vegetation concrete cured in the step 2) by using a spraying device, wherein the viscosity of the sealant is 25-30 s, the thickness of the block vegetation concrete is 10-15 cm, films with the thickness of 1-2 mm are formed on the surface and inside of the block vegetation concrete, and after the spraying is finished, the block vegetation concrete is placed for 24-48 h; wherein the mass percentage of the sealant in the massive vegetation concrete is less than or equal to 10%.
3. The method for surface-treating vegetation concrete with the sealant according to claim 2, wherein: in the step 3), the pressure of the spraying device is 0.4-0.5 MPa, and the running speed of the spraying device is controlled at 5-10 cm/s.
4. A method of surface treating vegetation concrete with a sealer according to claim 2 or 3, wherein: the spray coating is polyurethane spray coating equipment with the model of JNJX-Q5200.
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