CN112431085A

CN112431085A - Sesame-imitated white stone construction method of polymer concrete easy to maintain

Info

Publication number: CN112431085A
Application number: CN202011498484.9A
Authority: CN
Inventors: 汤建元; 李士林; 杜威; 肖华兵; 崔广涛
Original assignee: Third Engineering Co Ltd Of Cccc Third Highway Engineering Co ltd
Current assignee: Third Engineering Co Ltd Of Cccc Third Highway Engineering Co ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-03-02

Abstract

The invention discloses a sesame-imitated white stone construction method of polymer concrete easy to maintain, which comprises the following steps: step 1, mixing polymer concrete; step 2, transporting the polymer concrete; step 3, constructing an interface bonding waterproof layer; step 4, paving a polymer concrete surface layer; step 5, surface treatment; 6, sawing and sewing the polymer concrete sesame-imitated white stone; the invention has high construction mechanization degree and quick construction progress. Manpower and material resources are saved, labor intensity is reduced, and construction efficiency is improved. The loss and the damage in the carrying and installing process are avoided, the operation and the construction management are convenient, and the construction cost is reduced. The polymer concrete sesame-imitated white stone has good integrity and flatness after being poured, is not easy to damage, has no loosening phenomenon after natural stone is paved, and has low later-stage maintenance cost.

Description

Sesame-imitated white stone construction method of polymer concrete easy to maintain

Technical Field

The invention relates to a sesame-imitated white stone construction method of polymer concrete easy to maintain, belonging to the technical field of road construction.

Background

In recent years, the ecological environment protection construction idea and related matching policies which are vigorously advocated and popularized by the nation make the decorative concrete product which integrates ecology, environmental protection, landscape and economy more and more emphasized. Particularly in municipal roads, decorative concrete products will occupy more and more important positions, and the appearance of the novel BOMANITE-EXPOSE polymer concrete imitation sesame white stone makes a solid step for the development of the decorative concrete products of the municipal roads. In order to expand the application of the novel BOMANITE-EXPOSE polymer concrete sesame-imitated white stone in municipal engineering, the Zhongyue third highway engineering office depends on a freight passage project in a new Tianfu area, and the polymer concrete sesame-imitated white stone is adopted to carry out construction method research on the novel ecological environment-friendly decorative concrete product of the sidewalk surface layer, so that a series of research achievements and field construction experience are obtained. The novel BOMANITE-EXPOSE polymer concrete has the advantages of the traditional sesame white stone imitation cement concrete and the natural stone, waste aggregates are selected to realize the stone imitation effect by a high-tech process, the natural stone is effectively replaced, natural resources are saved, the service function of a road is improved, and a solid step is provided for the development of municipal roads integrating ecology, environmental protection, landscape and economy and the popularization of decorative concrete.

Disclosure of Invention

The invention aims to provide a polymer concrete sesame-imitated white stone construction method easy to maintain and maintain, and aims to solve the problems in the background technology.

In order to achieve the purpose, the invention adopts the following technical scheme: 1. the easy-maintenance construction method of the polymer concrete sesame-imitated white stone is characterized by comprising the following steps of:

step 1, mixing polymer concrete;

the construction mixing proportion of each cubic meter of polymer concrete is water: cement: fine aggregate: coarse aggregate: inorganic type bulk dyeing dispersant: a reinforcing agent: water reducing agent: polymer emulsion: = 170: 430: 543: 1255: :10.25: 9.84:6.75: 11.02;

transporting various materials to a mixing station by using a transport vehicle, firstly pouring a dispersant, a reinforcing agent, polymer emulsion and the like into a batching pool, simultaneously adding a small amount of water for mixing, controlling the fluidity of the solution by using a flow tester, controlling the time within 14-18 s, wherein the amount of the water is increased or decreased according to the actual measured fluidity on site, fully and uniformly mixing the mixed solution in the batching pool, starting a mixer, pumping the solution in the batching pool into a mixing pot by using a water pump, simultaneously adding cement and aggregate, wherein the metering accuracy of various materials is particularly important for the quality of the mixed materials in the production process of polymer concrete, so that the materials are metered by using a computer in the mixing process to ensure the quality of the mixed materials, and the materials are mixed in trial according to the designed proportioning and the temperature, the transport distance and the water content of aggregate before actual mixing to determine the final mixing ratio, the mixed mixture can meet the construction performance required by paving, and the quality of the mixed polymer concrete is prevented from fluctuating in the stirring process, so that the mixed mixture is uniform and consistent, and the phenomena of white material, segregation and caking are avoided;

step 2, transporting the polymer concrete;

the closed concrete tank truck is adopted for transportation, the tank truck washes away the wastes in the carriage before charging each time, so that the moisture in the carriage is ensured to be free from accumulated water, the viscosity of the polymer cement concrete is very high, and the time from the charging to the discharging of the mixture cannot exceed 60 minutes;

step 3, constructing an interface bonding waterproof layer;

the interface bonding waterproof layer is positioned between the concrete base layer and the polymer concrete surface layer after the scabbling treatment, the function of the interface bonding waterproof layer is to enhance the bonding of the interface so as to ensure that the surface layer and the base layer form a whole and also play a role in waterproofing, the interface bonding waterproof layer is polymer cement slurry formed by mixing and stirring an interface agent, cement and water, the polymer cement slurry is uniformly stirred after being mixed, the interface agent is vinyl acetate-ethylene copolymer VAE emulsion (BJ-707), the polymer concrete is coated and brushed after being transported to the front field and before being paved, the cement slurry is uniformly and flatly coated by a scraper during the coating, and the speed is optimal in terms of paving speed, so that the bonding waterproof layer material is ensured to be always in a wet state, and the paving speed cannot be influenced;

step 4, paving a polymer concrete surface layer;

the concrete is paved in a mode of falling to the ground by adopting a chute, and the engineering is carried out in a mode of paving 8cm polymer concrete at one time, so that the concrete can be densely paved in place, and the structural integrity can be ensured;

in order to ensure that the intervals between the granite blocks on the surface layer are uniform and dense, after concrete paving is finished, 5-16mm of elliptical granite macadam with the thickness of 1-2 cm is uniformly spread on the surface layer, namely concrete stirring coarse aggregate is used for carrying out aggregate embedding treatment;

if the construction is suddenly in light rain, the construction is finished to the construction section under tight shielding, the construction is stopped immediately when the construction is in heavy rain, and the slump of the concrete is well controlled according to the weather and the construction section condition;

for special structural parts, polymer concrete is poured into the mould with a trolley;

after concrete paving is finished, leveling is strictly carried out according to the elevation of the steel plate slide rail, leveling is carried out by using a friction vibration type leveling machine after leveling, a compaction allowance is reserved when concrete of a pavement layer is paved, and a proper amount of spade material is required to be properly supplemented by a special person in the friction vibration leveling process within 10-15 mm. The friction vibration type leveling machine is operated by the length of an experienced team, the traveling speed is not suitable to exceed 0.2 m/s for the first leveling, and the traveling speed can be properly accelerated for the second time and the third time but is not required to exceed 0.5 m/s;

in the friction leveling paving process, a special sprayer is used for spraying water to the steel roller in time so as to keep the surface of the steel roller clean all the time, a short roller with a connecting rod is added in the middle of three times of rolling for transverse rolling, and finally a worker uses a light-collecting machine for light collection;

step 5, surface treatment;

surface pretreatment, namely spraying a surface treating agent after no water is accumulated on the surface of the concrete. The surface treatment agent is a Superce deactivating agent for concrete surface, and is sprayed by an air compression spraying machine;

the polymer concrete should be pretreated with surface treating agent sprayed by an air compression shotcrete machine within ten minutes after paving. The first spraying is thin and uniform, interruption is prevented as much as possible, the thickness is increased as much as possible, the second spraying can be performed for the third time, the distance between the sprayed surface treating agent and the surface layer which is not smoothed and leveled and the roller of the leveling machine is at least 500mm, the total spraying thickness is about 1-2mm, and after the spraying is completed, finished product protection is performed;

washing and processing the surface; before large-area construction, a test block is needed to be made for trial washing, and after the optimum washing time is found out successfully, large-area surface treatment can be carried out;

after the pretreatment is carried out for 6-18 hours, a high-pressure cleaning machine is used for surface washing processing, the effect of imitating natural sesame white granite is realized, a spray gun is at least 500mm higher than a surface layer during cleaning, water can not be sprayed to a position tightly for a long time to prevent the montmorillonite, a hairbrush is used for being matched with the spray gun to clean the cement paste with an unobvious treatment effect, a water-retaining film and color stripe cloth are covered in time for maintenance after the cleaning operation is finished, the construction enters the season with the highest temperature all the year around according to the engineering, watering maintenance is combined with the film-covering maintenance, and a specially-assigned person is required to tightly observe an operation area before and after the cleaning so as to avoid pollution and cleaning effects in the cleaning process;

6, sawing and sewing the polymer concrete sesame-imitated white stone;

setting requirements of the expansion joint; the expansion joint is arranged according to the size requirement of the cutting block planned by the design, the expansion joint is penetrated to the bottom, and dust generated by the saw joint is immediately washed away after the cutting of the joint is finished. The width of the seam is 20-25 mm, the seam can be cut by a special cutting and sewing machine after the concrete is finally set, the filling material is polyurethane rubber strips or foam rods, an expansion seam is reserved, and the seam edge is preferably made into a fillet with the radius of 10-15 mm;

the longitudinal contraction joint can be arranged according to the width of the road surface and parallel to the center line of the road, and the transverse contraction joint is arranged according to the width of a drawing and transversely penetrates through the road surface;

the width of the contraction joint can be 3-8 mm, the depth of the contraction joint can be 90mm, the contraction joint is filled with polyurethane adhesive tapes and foam rods which have good indentation resistance and are well bonded with concrete, the expansion joint is cut by a special operator, the paying-off is kept straight during cutting, and the advancing speed is kept to be uniform and consistent with the paying-off direction during cutting;

the shrinkage cutting is carried out before the maintenance is finished, and can not exceed three days after the forming at the latest so as to prevent the surface layer from cracking.

As a further scheme of the invention, the method also comprises surface concrete curing, wherein the surface concrete is subjected to watering curing after pretreatment is finished, watering is carried out for 1 time/3 h, the polymer concrete is immediately covered with a plastic film or geotextile after being washed and processed by sesame-like white stone, the curing period is not less than 7 days, the lapping of the film has a certain length of 50cm, the film cannot be dragged on the surface in the covering process, the edge of the covered film is fixed, the sealing is ensured to be tight, and the quality problem caused by local water loss is avoided.

As a further scheme of the invention, the method also comprises the steps of cleaning and sealing the surface layer concrete;

maintaining the surface concrete for 7 days, cleaning with clear water, washing off white fog in a certain area by using weak acid, and uniformly spraying BOMANITE-EXPOSE-LIQ Shield on the surface after the surface is completely dried to be used as surface curing treatment to protect a working surface;

the surface curing treatment not only achieves the attractive appearance of the pavement, but also protects the polymer concrete sesame-like white stone, increases the oxidation resistance and acid-base corrosion resistance of the polymer concrete, closes the traffic after the construction of the functional surface treatment layer is finished, and can open the traffic after standing for 8 hours.

As a further scheme of the invention, the cement adopts 42.5R ordinary portland cement, the fine aggregate is medium-coarse sand, the coarse aggregate adopts 5-16mm oval granite macadam, the dyeing dispersant is Integral Color dyeing dispersant, the polymer emulsion is prepared by tile rubber powder, polysiloxane BS4004, tartaric acid and EVA emulsion, the dyeing dispersant and the polymer emulsion are both produced by BOMANITE company in America, the reinforcing agent is GSM-85SD active silica micropowder, and the water reducing agent is a Huawang brand water reducing agent produced by Shanghai Huawang chemical Limited.

Compared with the prior art, the invention has the beneficial effects that: the novel BOMANITE-EXPOSE polymer concrete sesame-imitated white stone adopts a cast-in-place process, is transported by a closed tank car, and has high construction mechanization degree and quick construction progress. Compared with the traditional stone installation, the method saves manpower and material resources, reduces the labor intensity and improves the construction efficiency. The loss and the damage in the carrying and installing process are avoided, the operation and the construction management are convenient, and the construction cost is reduced. The construction process is simple and convenient: the polymer concrete is formed by one-step stirring and paving process, is self-compacting, and is matched with surface curing treatment to make the surface layer firm and wear-resistant, thereby forming the effect of imitating natural stone.

The polymer emulsion is added into the cementing material, so that the pores and microcracks in the cement concrete are effectively filled, the compactness and the cohesive force of the material are improved, and the sesame-like white stone of the polymer concrete is firmer and more durable than stone.

The polymer concrete sesame-imitated white stone has more uniform and natural colors of natural stone and sand particles in the stirring and pouring process, realizes the texture of the natural stone and has very good landscape effect. The polymer concrete sesame-imitated white stone has good integrity and flatness after being poured, is not easy to damage, has no loosening phenomenon after natural stone is paved, and has low later-stage maintenance cost.

Drawings

FIG. 1 is a schematic view of the process of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely explained below with reference to the drawings in the embodiments of the present invention.

Mixing polymer concrete;

the construction mixing proportion of each cubic meter of polymer concrete is water: cement: fine aggregate: coarse aggregate: inorganic type bulk dyeing dispersant: a reinforcing agent: water reducing agent: polymer emulsion: = 170: 430: 543: 1255: :10.25: 9.84:6.75:11.02. The cement is 42.5R ordinary portland cement, the fine aggregate is medium-coarse sand, and the coarse aggregate is 5-16mm oval granite macadam. The dyeing dispersant is Integral Color Integral dyeing dispersant, and the polymer emulsion is prepared from watt rubber powder, polysiloxane BS4004, tartaric acid and EVA emulsion. The dyeing dispersant and the polymer emulsion are both produced by BOMANITE company of America, the reinforcing agent is GSM-85SD active silica micropowder, and the water reducing agent is a Huawang brand water reducing agent produced by Shanghai Huawang chemical company Limited.

And (4) transporting various materials to a stirring station by using a transport vehicle. Firstly, pouring a dispersing agent, a reinforcing agent, polymer emulsion and the like into a batching tank, simultaneously adding a small amount of water for blending, wherein the fluidity of the solution is properly controlled by a flow tester, the time is properly controlled within 14-18 s, and the amount of the water is properly increased and decreased according to the fluidity actually measured on site. And (3) fully and uniformly stirring the mixed solution in the proportioning pool, starting the stirrer, pumping the solution in the proportioning pool into a stirring pot by using a water pump, and simultaneously adding cement and aggregate. In the production process of polymer concrete, the accuracy of the measurement of various materials is particularly important for the quality of mixed materials, so that the measurement of the mixed materials is carried out by adopting a computer in the mixing process so as to ensure the quality of the mixed materials. Before actual mixing, trial mixing is carried out according to the design proportion and the field conditions (temperature, transport distance, water content of aggregate and the like), the final mixing proportion is determined, and the mixed mixture can meet the construction performance required by paving. The quality of the stirred polymer concrete is prevented from fluctuating in the stirring process, so that the stirred mixture is uniform and consistent, and the phenomena of white material, segregation and caking are avoided.

Transporting polymer concrete;

and 4 closed concrete tank trucks are adopted for transportation according to the stirring yield, the transport distance and the paving speed. Before the tank car is charged every time, the wastes in the carriage are washed clean, so that the carriage is moist and free of accumulated water. The polymer cement concrete is very viscous, so the time from the loading of the mixture to the unloading of the mixture cannot exceed 60 minutes. When the mixing station is in failure or other reasons and the mixing needs to be stopped for a long time, the mixed materials are immediately transported to the front field. When the polymer concrete is delivered to a forecourt and mechanical failure of the forecourt is met, the mixing station is timely informed to suspend or slow down the production of the polymer concrete. If the polymer concrete which is not poured or poured but not paved and formed has initial set during the construction recovery, the polymer concrete is immediately poured or removed.

Constructing an interface bonding waterproof layer;

the interface bonding waterproof layer is positioned between the concrete base layer and the polymer concrete surface layer after the roughening treatment, and is used for enhancing the bonding of the interface so as to ensure that the surface layer and the base layer form a whole and play a waterproof role at the same time. The interface bonding waterproof layer is polymer cement slurry formed by mixing and stirring an interface agent, cement and water, and the polymer cement slurry is uniformly stirred after being mixed. The interface agent is vinyl acetate-ethylene copolymer VAE emulsion (BJ-707), and is coated after the polymer concrete is transported to the forecourt and before paving, and a scraper blade is used for uniformly and flatly coating the cement paste during coating. The speed is optimized to supply the paving speed, so that the bonding waterproof layer material is always in a wet state, and the paving speed is not influenced.

Paving a polymer concrete surface layer;

the spreading adopts a mode of falling to the ground by a chute. The engineering is carried out by adopting a one-time paving mode of 8cm polymer concrete, so that the concrete can be densely paved in place, and the structural integrity can be ensured.

In order to ensure that the intervals between the granite blocks on the surface layer are uniform and dense, 5-16mm of elliptical granite macadam (namely concrete stirring coarse aggregate) with the thickness of 1-2 cm is uniformly spread on the surface layer to be subjected to aggregate embedding treatment after the concrete is paved.

If the construction is suddenly in light rain, the construction is finished to the construction section under tight shielding, and the construction is stopped immediately in heavy rain. The slump of the concrete is well controlled according to weather and construction section conditions.

For special construction sections, polymer concrete is poured into the mold using a trolley.

5.6.5 after paving the concrete, leveling strictly according to the elevation of the steel plate slide rail, and leveling by using a friction vibration type leveling machine after leveling. When the concrete is paved on the pavement layer, a compaction allowance (generally between 10 mm and 15 mm) is reserved. In the friction vibration leveling process, a special person needs to supplement materials with a proper amount of shovels in time. The friction vibration type leveling machine is operated by the length of an experienced team, the traveling speed is not suitable to exceed 0.2 m/s for the first leveling, and the traveling speed can be suitably accelerated for the second time and the third time but is not required to exceed 0.5 m/s.

5.6.6 spraying water to the steel roller with sprayer to keep the surface clean all the time, adding short roller with connecting rod in the middle of three times of rolling, and finishing with finishing machine.

Surface treatment; surface pretreatment, namely spraying a surface treating agent after no water is accumulated on the surface of the concrete. The surface treatment agent is a Superce deactivating agent for concrete surface, and is sprayed by an air compression spraying machine.

(1) The polymer concrete should be pretreated with surface treating agent sprayed by an air compression shotcrete machine within ten minutes after paving. The first spraying is thin and uniform, interruption is prevented as much as possible, the thickness is increased in the second spraying, the third spraying can be performed for key compensation, and the distance between the sprayed surface treatment agent and the surface layer which is not smoothed and leveled and the roller of the leveling machine is at least 500 mm. The total thickness of the spraying is about 1-2mm, and after the spraying is finished, the finished product protection is carried out.

Washing and processing the surface;

(1) before large-area construction, test blocks are needed to be used for test washing, and after the optimum washing time is found out successfully, large-area surface treatment can be carried out.

(2) After 6-18 hours of pretreatment (determined according to factors such as maintenance temperature, humidity and the like), a high-pressure cleaning machine is used for surface washing processing, and the effect of imitating the natural sesame and white granite is realized. When cleaning, the spray gun is higher than the surface layer by at least 500mm, and can not spray water for a long time at one position to prevent the montmorillonite. The parts with unobvious treatment effect of individual cement paste should be cleaned by using a hairbrush and a spray gun. And after the cleaning operation is finished, covering the water-retaining film and the color strip cloth in time for maintenance. According to the construction of the project, the construction enters the season with highest temperature all the year around, and watering maintenance is combined with film covering maintenance. Before and after cleaning, a special person should stare at the operation area to avoid pollution and cleaning effect in the cleaning process.

And (4) maintaining the pavement, namely performing water spraying maintenance on the surface concrete after the pretreatment is finished, and spraying water for 1/3 h. After the polymer concrete sesame-imitated white stone is washed and processed, the polymer concrete is immediately covered by a plastic film or geotextile. The life-preserving period is not less than 7 days. The overlap of the films has a certain length of about 50 cm. The film must not be pulled over the facing during the draping process. The edge of the covered film is fixed, so that the sealing is ensured to be tight, and the quality problem caused by partial water loss is avoided.

Setting requirements of the expansion joint;

(1) the expansion joint is arranged according to the size requirement of the cutting block planned by the design, the expansion joint is penetrated to the bottom, and dust generated by the saw joint is immediately washed away after the cutting of the joint is finished. The width of the seam is 20-25 mm, and the seam can be cut by a special cutting and sewing machine after the concrete is finally set. The filling material is polyurethane adhesive tape or foam rod, the expansion gap is reserved, and the edge of the expansion gap is preferably made into a fillet with the radius of 10-15 mm.

(2) The longitudinal contraction joint can be arranged according to the width of the road surface and the central line of the parallel road, and the transverse contraction joint is arranged according to the width of the drawing and transversely penetrates through the road surface.

(3) The width of the contraction joint can be 3-8 mm, and the depth can be 90 mm. Polyurethane rubber strips and foam rods which have good indentation resistance and are well bonded with concrete are filled in the gaps. The cutting expansion joint should be operated by a special person, the paying-off is required to be kept straight during cutting, and the feeding speed is required to be kept constant and consistent with the paying-off direction during cutting.

(4) The shrinkage cutting is carried out before the maintenance is finished, and can not exceed three days after the forming at the latest so as to prevent the surface layer from cracking.

Cleaning and sealing;

and (3) after the surface concrete is maintained for 7 days, cleaning the surface concrete by using clear water, wherein a certain area has 'white fog' and the surface concrete is washed off by using weak acid. After the surface is completely dried, the BOMANITE-EXPOSE-LIQ Shield is uniformly sprayed on the surface to be used as surface curing treatment to protect the working surface.

The surface curing treatment not only achieves the beautiful appearance of the pavement, but also protects the polymer concrete sesame-like white stone and increases the oxidation resistance and acid-base corrosion resistance of the polymer concrete sesame-like white stone. After the construction of the functional surface treatment layer is finished, the traffic is closed and passed, and the traffic can be opened after the functional surface treatment layer is kept stand for 8 hours (the time can be properly adjusted according to the field air temperature, ventilation conditions and the like).

The main materials are shown in Table 1

TABLE 1

The technical principle of the invention is as follows: the polymer concrete sesame-imitated white stone is suitable for paving decorative roads and terraces such as sidewalks, garden landscape roads, urban squares, parks and the like. The polymer concrete sesame-imitated white stone is concrete which takes medium coarse sand as fine aggregate, takes 5-16mm elliptic granite broken stone as coarse aggregate, takes cement and polymer emulsion as cementing materials, and takes dyeing dispersant, reinforcer and water reducer as additives. The cement mortar is prepared by stirring various materials according to the mixing proportion and the dosage and solidifying cement and polymer in the pouring and curing processes. The polymer fills the pores and micro cracks in the cement concrete, can improve the compactness of the cement concrete, enhance the binding force between cement stones and aggregates, alleviate the stress concentration at the tips of the cracks, change the original performance of common cement concrete, and have good performances of oil resistance, flame resistance, heat resistance, light resistance, acid and alkali resistance, ozone aging resistance, flatness, skid resistance and the like.

The foregoing is a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that variations, modifications, substitutions and alterations can be made in the embodiment without departing from the principles and spirit of the invention.

Claims

1. The easy-maintenance construction method of the polymer concrete sesame-imitated white stone is characterized by comprising the following steps of:

step 1, mixing polymer concrete;

step 2, transporting the polymer concrete;

step 3, constructing an interface bonding waterproof layer;

step 4, paving a polymer concrete surface layer;

after concrete paving is finished, strictly leveling according to the elevation of the steel plate slide rail, leveling by using a friction vibration type leveling machine after leveling, reserving a compaction allowance when concrete of a pavement layer is paved, wherein the compaction allowance is between 10 mm and 15mm, and a proper amount of materials are supplemented by a spade timely by a special person in the friction vibration leveling process;

the friction vibration type leveling machine is operated by the length of an experienced team, the traveling speed is not suitable to exceed 0.2 m/s for the first leveling, and the traveling speed can be properly accelerated for the second time and the third time but is not required to exceed 0.5 m/s;

step 5, surface treatment;

surface pretreatment, namely spraying a surface treatment agent after no water is accumulated on the surface of the concrete;

the surface treatment agent is a Superce deactivating agent for concrete surface, and is sprayed by an air compression spraying machine;

the polymer concrete is subjected to surface aggregate pretreatment by using a surface treating agent sprayed by an air compression pulp sprayer within ten minutes after paving;

the first spraying is thin and uniform, interruption is prevented as much as possible, the thickness is increased as much as possible, the second spraying can be performed for the third time, the distance between the sprayed surface treating agent and the surface layer which is not smoothed and leveled and the roller of the leveling machine is at least 500mm, the total spraying thickness is about 1-2mm, and after the spraying is completed, finished product protection is performed;

6, sawing and sewing the polymer concrete sesame-imitated white stone;

setting requirements of the expansion joint; the expansion joint is arranged according to the size requirement of a cutting block planned by design and is penetrated to the bottom, and dust generated by sawing seams is immediately washed away after the cutting seams are finished;

the width of the seam is 20-25 mm, the seam can be cut by a special cutting and sewing machine after the concrete is finally set, the filling material is polyurethane rubber strips or foam rods, an expansion seam is reserved, and the seam edge is preferably made into a fillet with the radius of 10-15 mm;

2. The easy-to-maintain polymer concrete sesame-like white stone construction method according to claim 1, further comprising surface concrete curing, wherein the surface concrete is subjected to watering curing after the pretreatment is completed, the watering is performed for 1 time/3 h, the polymer concrete sesame-like white stone is immediately covered with a plastic film or geotextile after being washed, the curing period is not less than 7 days, the overlapping joint of the films has a certain length of 50cm, the films cannot be pulled on the surface during the covering process, the edges of the covered films are fixed, the sealing is ensured to be tight, and the quality problem caused by local water loss is avoided.

3. The easy-to-maintain polymer concrete sesame-imitated white stone construction method as claimed in claim 1, further comprising cleaning and sealing surface concrete;

4. The easy-to-maintain polymer concrete sesame-like white stone construction method of claim 1, wherein the cement is 42.5R ordinary portland cement, the fine aggregate is medium coarse sand, the coarse aggregate is 5-16mm oval granite macadam, the dyeing dispersant is Integral dyeing dispersant of Integral Color, the polymer emulsion is prepared from wacker rubber powder, polysiloxane BS4004, tartaric acid and EVA emulsion, the dyeing dispersant and the polymer emulsion are both produced by BOMANITE company of America, the reinforcing agent is GSM-85SD active silica micropowder, and the water reducing agent is a Kao brand water reducing agent produced by Shanghai Kao chemical Co.