CN112030654A - Exposed aggregate pervious concrete construction method for water environment treatment - Google Patents
Exposed aggregate pervious concrete construction method for water environment treatment Download PDFInfo
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- CN112030654A CN112030654A CN202010618303.5A CN202010618303A CN112030654A CN 112030654 A CN112030654 A CN 112030654A CN 202010618303 A CN202010618303 A CN 202010618303A CN 112030654 A CN112030654 A CN 112030654A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
- E01C11/224—Surface drainage of streets
- E01C11/225—Paving specially adapted for through-the-surfacing drainage, e.g. perforated, porous; Preformed paving elements comprising, or adapted to form, passageways for carrying off drainage
- E01C11/226—Coherent pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
- E01C7/351—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with exclusively hydraulical binders; Aggregate, fillers or other additives for application on or in the surface of toppings with exclusively hydraulic binders
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a construction method of exposed aggregate pervious concrete for water environment treatment, which comprises the following steps: preparing concrete by field stirring, ensuring the quality of the concrete, paving a gravel stone cushion layer, pervious concrete and exposed aggregate pervious concrete in sequence, paving uniformly by manpower, distributing by using a spade in a back-buckling manner, wherein the paving coefficient is 1.1, meanwhile, preparing a covering plastic cloth, scraping, vibrating, finishing and smoothing the surface, spraying a cleaning agent, washing the exposed aggregate, maintaining, cutting and filling joints on the pavement, filling the joints by using polyurethane soft adhesive, wherein the filled polyurethane soft adhesive is not higher than the surface of the aggregate pervious concrete, and finishing and leveling the surface layer of the polyurethane soft adhesive; carrying out protective treatment on two sides of the aggregate pervious concrete seam by using masking paper; 11) and (3) cleaning the surface of the aggregate pervious concrete by using a high-pressure cleaning machine, spraying the dipropylene polyurethane sealant after the surface is dried for 24 hours, and arranging a guard around the ground which is just sprayed until the pavement is formed. This has the advantage.
Description
Technical Field
The invention relates to the field of water environment treatment engineering, in particular to a construction method of exposed aggregate permeable concrete for water environment treatment.
Background
The exposed aggregate permeable concrete is a permeable pavement ground formed by using a cementing material as an adhesive material and bonding aggregates of a certain size fraction together to form a porous pavement and using permeable concrete as a base layer. The natural stone surface layer aggregate is characterized in that the natural stone surface layer aggregate realizes a natural non-artificial carved natural pavement effect by utilizing the self color and shape of the natural stone and the permanently-wetted gloss effect.
The exposed aggregate permeable concrete can increase the water permeable and air permeable area of a city, enhance the heat and water exchange between the earth surface and the air, adjust the city climate, reduce the earth surface temperature and be beneficial to relieving the heat island effect of the city; rain, snow and precipitation are fully utilized, the relative humidity of the earth surface is increased, increasingly exhausted underground water resources in urban areas are supplemented, stratum subsidence caused by the exhaustion of the underground water resources is prevented, and the function of a water reservoir of the water permeable roadbed is exerted; improving the living conditions of urban surface plants and beneficial soil microorganisms and adjusting ecological balance; the burden of an urban road drainage system in a rainwater season can be reduced, surface runoff is reduced, and the pollution of rainstorm to urban water is obviously reduced; meanwhile, the road surface water and the road surface at night are prevented from reflecting light, black ice (a layer of invisible thin ice formed by frost and fog is extremely dangerous) cannot be formed on the road surface in winter, and the passing comfort and the safety of vehicles and pedestrians are improved.
Based on the characteristics, the exposed aggregate permeable concrete is widely applied to pavement of public roads.
However, the existing aggregate-exposed permeable concrete has no standard paving method, the paving quality is difficult to guarantee, and the paving efficiency is insufficient.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a construction method of exposed aggregate pervious concrete for water environment treatment, which ensures the pavement quality, refines the pavement process and improves the pavement efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that: a construction method of exposed aggregate pervious concrete for water environment treatment comprises the following steps:
1) preparing concrete by stirring on site, and respectively preparing pervious concrete and exposed aggregate pervious concrete;
2) leveling a basic pavement to make the surface rough and clean without accumulated water, then brushing an interface agent, paving a sand gravel cushion layer and leveling the pavement;
3) paving pervious concrete to further level the pavement;
4) paving the bone material pervious concrete, paving the concrete evenly by manpower, distributing the concrete by using a spade in a reverse buckling manner, wherein the paving coefficient is 1.1, and meanwhile, preparing to cover plastic cloth to timely cover a construction site in the condition of overlong paving time or strong wind weather;
5) after the material distribution is finished, a scraping bar is used for scraping, a vibrator is used for vibrating, the material is scraped again after vibrating, and the material is supplemented to the material shortage place in time in the process;
6) finishing and smoothing the surface, modifying the edges and corners of the vibrated pavement, filling and finishing the material-lacking parts in time, and spraying water mist for supplementing water during filling;
7) spraying a cleaning agent, namely spraying by using an air pump as a power source, wherein the cleaning agent needs to be prepared in real time while finishing and collecting light on the surface, the spraying needs to be uniform and in place without gaps, the spraying thickness does not exceed 2mm, the spraying adopts segmented spraying, after each segment of spraying is finished, a plastic film is immediately used for covering, a layer of color strip cloth is used for secondary covering and pressing, and the time is kept for 10-20 hours;
8) flushing exposed aggregate, namely flushing the exposed aggregate by adding water by using a high-pressure water gun, flushing by adopting sectional flushing, and after the flushing of each section is finished, lifting the plastic film of the next section for flushing;
9) maintaining, namely maintaining a small amount of water on the road surface after flushing, then covering plastic cloth for maintaining, maintaining watering to keep the road surface in a wet state in the maintenance process, keeping condensed water in the plastic cloth all the time, keeping the water for watering consistent with a water source for preparing pervious concrete, not allowing watering when the temperature is lower than 4 ℃, and maintaining for 5-6 days;
10) cutting seams on the pavement and filling the seams, wherein the distance between the seam shrinkage surface layers is 5m, the width of the seams is 8mm, and the seams penetrate through the whole surface layer; the distance between the expansion joint surface layers is 20m, the width of the joint is 20mm, and the depth of the joint penetrates through the whole surface layer; after cutting the seam, manually cleaning the aggregate pervious concrete seam wall, brushing sundries on the seam wall by using a steel wire brush, and keeping the aggregate pervious concrete of the seam wall in a dry state; filling the seams with polyurethane soft glue, wherein the filled polyurethane soft glue is not higher than the surface of the aggregate pervious concrete, and performing light-collecting and leveling treatment on the polyurethane soft glue surface layer; carrying out protective treatment on two sides of the aggregate pervious concrete seam by using masking paper;
11) and (3) cleaning the surface of the aggregate pervious concrete by using a high-pressure cleaning machine, spraying the dipropylene polyurethane sealant after the surface is dried for 24 hours, and arranging a guard around the ground which is just sprayed until the pavement is formed.
Basically, in the step 1), the transfer time between the stirring material preparation site and the material distribution site is within ten minutes.
Basically, a temperature and humidity monitor is arranged on a construction site to control the retention time after the cleaning agent is sprayed.
Basically, in the step 1), the cement for stirring is P.O 42.5.5 grade cement, the particle size of the aggregate is 6-8mm, the aggregate is pre-screened and cleaned, and the oversize aggregate and stone powder are removed, so as not to influence the water permeability.
Basically, in the step 1), the exposed aggregate pervious concrete is proportioned according to the following formula:
wherein mg, mc, mf and mw are the dosage of coarse aggregate, cement, reinforcing agent and water in the concrete of unit volume, and the unit is kg;
ρg、ρc、ρf、ρwthe apparent densities of the coarse aggregate, the cement, the reinforcing agent and the water are respectively expressed in kg/m 3; p indicates the eyeAnd marking the porosity, taking 15%.
Compared with the prior art, the concrete paving machine has outstanding substantive characteristics and remarkable progress, and particularly, the concrete paving machine adopts on-site material mixing to ensure the quality of concrete, adopts a mode of overlapping pervious concrete and exposed aggregate pervious concrete to ensure the water permeability of a road surface, and simultaneously avoids the problem of insufficient strength of the road surface caused by over-thickness of exposed aggregate pervious concrete.
In the process of spraying the cleaning agent, the spraying thickness is controlled, the problems that the surface is not cleanly washed due to thin spraying and the washed cement slurry is too much and the surface stones are not firmly bonded due to over-thick spraying are solved, a plastic film and color strip cloth are used for covering twice after spraying, the road surface condition is observed regularly according to temperature and humidity data, and preparation is made for washing; the washing process adopts the high-pressure squirt to wash, washes according to the segmentation in order, avoids that the line is lifted and is washed together, guarantees the quality on road surface, washes and carries out the maintenance after finishing, waters, and the tectorial membrane guarantees to have the condensate water in the plastic sheeting.
The sizes of the cut seams and the joint seams need to be controlled, polyurethane soft glue is filled in the gaps, and the decorative paper is used for protective treatment to avoid polluting the surrounding pavement in the operation process, finally, a high-pressure cleaning machine is used for cleaning the pavement once before the sealant is sprayed, the polypropylene-acrylate polyurethane sealant is sprayed after the pavement is kept dry for 24 hours, and enclosure is arranged until the pavement is formed.
The exposed aggregate permeable concrete pavement laid by the construction method is excellent in water permeability, can supplement groundwater and adjust climate, relieves the peripheral heat island effect, and has high ornamental value, meanwhile, the double-layer permeable concrete pavement has a filtering function, the upper layer exposed aggregate permeable concrete filters large particles, and the lower layer permeable concrete and gravel layer filter small particles such as heavy metals and dust, so that the water finally gathered in rivers or groundwater is more purified.
In addition, the double-layer permeable concrete pavement has thicker permeable layer, has excellent effect of reducing noise in vehicle running, can also reduce the reflection heat of sunlight on the surface of the road, reduces the surface temperature, particularly solves the problem of water accumulation in rainstorm weather, and also provides enough skid resistance, and the safety factor is higher.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
A construction method of exposed aggregate pervious concrete for water environment treatment comprises the following steps:
1) the concrete is prepared by on-site stirring, the pervious concrete and the exposed aggregate pervious concrete are respectively prepared, a small dump truck is used for transportation, and the time from the discharge of the stirrer to the transportation to a paving place is controlled to be within ten minutes as much as possible.
2) And leveling the basic pavement to make the surface rough and clean without accumulated water, then brushing the interface agent, paving a gravel cushion layer, and leveling the pavement.
3) Paving pervious concrete to further level the pavement.
4) Paving the bone material pervious concrete, uniformly paving by manpower, distributing by a spade in a reverse buckling manner, and strictly prohibiting throwing. The flatness and the drainage gradient are found accurately, the compaction reserved height of the paving thickness is considered, and the loose paving coefficient is preferably 1.1. During construction, the edge is particularly noticed whether the material is deficient or not, and the material is supplemented in time for manual compaction. When the paving time of the aggregate pervious concrete is longer than 30min or in windy weather, the on-site concrete is covered with the plastic cloth in time to prevent the aggregate pervious concrete from losing moisture too quickly.
5) And after the distribution of the aggregate pervious concrete is finished, a scraping bar is used for scraping, a flat vibrator is used for vibrating, then the scraping is carried out, the material is supplemented to the material lacking place in time, and special equipment for the aggregate pervious concrete is used for vibrating and leveling the surface until the surface is as high as the template.
6) And (3) finishing and smoothing the surface, timely finishing the corners of the aggregate pervious concrete on the ground pavement, finishing the part lacking the materials by filling, uniformly spraying a layer of water on the drier part, and finishing by adding the materials.
7) Spraying a cleaning agent, wherein the spraying of the exposed aggregate cleaning agent is carried out after the paving, compaction and surface finishing of the aggregate pervious concrete are finished; spraying the exposed aggregate cleaning agent by using an air pump; the cleaning agent can not be prepared in advance, and must be prepared when the surface layer is trimmed and polished; pouring the cleaning agent into a funnel pot, and spraying the surface layers one by one; the spraying cleaning agent must ensure full coverage, and if necessary, the spraying can be carried out twice; the cleaning agent is sprayed uniformly in place, stones cannot be washed out of the surface which cannot be sprayed, and the surface cannot be washed cleanly due to over-thin spraying; the sprayed thickness is too thick, so that the washed cement paste is too much, the surface stones are not firmly bonded, and the sprayed thickness is generally controlled not to exceed 2 mm.
After the cleaning agent is sprayed, a plastic film is immediately used for covering, and the plastic film is covered for the second time by using color stripe cloth, if a strong wind environment is met, a heavy object is used for pressing the film so as to ensure that no surface layer is exposed in the air; after the film is covered, the time is recorded by a specially-assigned person, and the responsible person regularly observes the surface cement condition according to the field temperature and humidity so as to ensure the optimal flushing time, and generally flushes after 10-20 hours (according to the weather condition) after the cleaning agent is sprayed. And arranging a temperature and humidity monitor on a construction site to control the retention time after the cleaning agent is sprayed.
8) The exposed aggregate is washed by a high-pressure water gun, the washing is carried out in sequence, a section of plastic film is firstly lifted, and the next section of plastic film is lifted after the washing is finished, so that the plastic films cannot be washed together after being lifted completely; after finishing the surface finishing of the concrete with the exposed aggregate and the permeable water, spraying a small amount of water in time and covering a plastic film for curing, wherein the curing period is the same as that of common concrete, and a fence is arranged around the road surface during curing, so that people are strictly prohibited to get on the road.
9) Maintaining, wherein the watering frequency is controlled according to the field temperature and humidity, the bone exposing permeable concrete can be kept in a wet state, and watering is not required when the daily average temperature is lower than 4 ℃; the water for pervious concrete curing is the same as the water for mixing. The permeable concrete is covered and maintained by plastic cloth, the whole surface of the permeable concrete is tightly covered, and condensed water in the plastic cloth is kept. The curing time is 5-6 days.
10) Cutting seams on the pavement and filling the seams, wherein the distance between the seam shrinkage surface layers is 5m, the width of the seams is 8mm, and the seams penetrate through the whole surface layer; the distance between the expansion joint surface layers is 20m, the width of the joint is 20mm, and the depth of the joint penetrates through the whole surface layer; after cutting the seam, manually cleaning the aggregate pervious concrete seam wall, brushing sundries on the seam wall by using a steel wire brush, and keeping the aggregate pervious concrete of the seam wall in a dry state; polyurethane soft glue is adopted to fill the joint, and the two sides of the aggregate permeable concrete joint are subjected to protective treatment by masking paper, so that the pollution to the surrounding pavement in the operation process is avoided; note that the filled polyurethane soft glue cannot be higher than the surface of the pervious concrete; the polyurethane soft rubber surface layer is subjected to light receiving and leveling treatment by using a flat tool, and water can be properly dipped in the light receiving and leveling process to keep lubrication.
11) And (3) cleaning the surface of the aggregate pervious concrete by using a high-pressure cleaning machine, spraying the dipropylene polyurethane sealant after the surface is dried for 24 hours, and arranging a guard around the ground which is just sprayed until the pavement is formed.
Selection of raw materials: the cement for stirring is P.O 42.5.5 grade cement, the particle size of aggregate is 6-8mm, the aggregate is pre-screened and cleaned, and the oversize aggregate and stone powder are removed, so as to avoid affecting the water permeability.
The admixture should meet the regulations of concrete admixture (GB 8076). Manufacturers of pervious concrete reinforcing materials should be accompanied with product use instructions and quality certificates.
The exposed aggregate pervious concrete is prepared according to the following formula:
wherein mg, mc, mf and mw are the dosage of coarse aggregate, cement, reinforcing agent and water in the concrete of unit volume, and the unit is kg;
ρg、ρc、ρf、ρwthe apparent densities of the coarse aggregate, the cement, the reinforcing agent and the water are respectively expressed in kg/m 3; p refers to the target porosity, taken as 15%.
Determining the slump of the mixture to be 20-50 mm according to site construction conditions (weather conditions, transport distances of the mixture, connection conditions of all working procedures and the like); in the prepared concrete mixture, the cementing material can uniformly wrap the aggregate, and pores are uniformly distributed in the concrete after forming to form a through pore network.
The road surface paved by the scheme has the following advantages:
the bone exposing material pervious concrete is an environment-friendly material, is made of natural colored stones, and the diversity and the aesthetic property of the color of the pervious concrete add vitality to a pavement.
The exposed aggregate permeable concrete and permeable concrete double-layer construction process has a more perfect filtering function, and can prevent heavy metal discharged by automobiles and industries, tire abrasion, industrial dust and the like from directly flowing into rivers.
The noise that sends in can reducing the vehicle and travel effectively alleviates the noise to citizen's influence. In addition, the heat energy reflected by sunlight on the surface of the road can be reduced, the surface temperature is reduced, and the urban heat island effect is relieved.
The water permeability is good, and the clearance of permeating water is about twenty percent, if meet torrential rain weather, can permeate the rainwater underground fast, alleviates urban ponding phenomenon.
The antiskid performance is good, the friction force between the tire and the ground can be increased, the antiskid function is good, and particularly, the safety coefficient of driving is very high in rainy and snowy weather.
Is suitable for the landscape effect requirements of landscape roads, squares and large-scale exhibitions.
Finally, it should be noted that the above-mentioned embodiments illustrate only some of the embodiments of the invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (5)
1. A construction method of exposed aggregate pervious concrete for water environment treatment is characterized by comprising the following steps: the method comprises the following steps:
1) preparing concrete by stirring on site, and respectively preparing pervious concrete and exposed aggregate pervious concrete;
2) leveling a basic pavement to make the surface rough and clean without accumulated water, then brushing an interface agent, paving a sand gravel cushion layer and leveling the pavement;
3) paving pervious concrete to further level the pavement;
4) paving the bone material pervious concrete, paving the concrete evenly by manpower, distributing the concrete by using a spade in a reverse buckling manner, wherein the paving coefficient is 1.1, and meanwhile, preparing to cover plastic cloth to timely cover a construction site in the condition of overlong paving time or strong wind weather;
5) after the material distribution is finished, a scraping bar is used for scraping, a vibrator is used for vibrating, the material is scraped again after vibrating, and the material is supplemented to the material shortage place in time in the process;
6) finishing and smoothing the surface, modifying the edges and corners of the vibrated pavement, filling and finishing the material-lacking parts in time, and spraying water mist for supplementing water during filling;
7) spraying a cleaning agent, namely spraying by using an air pump as a power source, wherein the cleaning agent needs to be prepared in real time while finishing and collecting light on the surface, the spraying needs to be uniform and in place without gaps, the spraying thickness does not exceed 2mm, the spraying adopts segmented spraying, after each segment of spraying is finished, a plastic film is immediately used for covering, a layer of color strip cloth is used for secondary covering and pressing, and the time is kept for 10-20 hours;
8) flushing exposed aggregate, namely flushing the exposed aggregate by adding water by using a high-pressure water gun, flushing by adopting sectional flushing, and after the flushing of each section is finished, lifting the plastic film of the next section for flushing;
9) maintaining, namely maintaining a small amount of water on the road surface after flushing, then covering plastic cloth for maintaining, maintaining watering to keep the road surface in a wet state in the maintenance process, keeping condensed water in the plastic cloth all the time, keeping the water for watering consistent with a water source for preparing pervious concrete, not allowing watering when the temperature is lower than 4 ℃, and maintaining for 5-6 days;
10) cutting seams on the pavement and filling the seams, wherein the distance between the seam shrinkage surface layers is 5m, the width of the seams is 8mm, and the seams penetrate through the whole surface layer; the distance between the expansion joint surface layers is 20m, the width of the joint is 20mm, and the depth of the joint penetrates through the whole surface layer; after cutting the seam, manually cleaning the aggregate pervious concrete seam wall, brushing sundries on the seam wall by using a steel wire brush, and keeping the aggregate pervious concrete of the seam wall in a dry state; filling the seams with polyurethane soft glue, wherein the filled polyurethane soft glue is not higher than the surface of the aggregate pervious concrete, and performing light-collecting and leveling treatment on the polyurethane soft glue surface layer; carrying out protective treatment on two sides of the aggregate pervious concrete seam by using masking paper;
11) and (3) cleaning the surface of the aggregate pervious concrete by using a high-pressure cleaning machine, spraying the dipropylene polyurethane sealant after the surface is dried for 24 hours, and arranging a guard around the ground which is just sprayed until the pavement is formed.
2. The exposed aggregate permeable concrete construction method for water environmental management according to claim 1, characterized in that: in the step 1), the transfer time between the stirring and material preparing site and the material distributing site is within ten minutes.
3. The exposed aggregate permeable concrete construction method for water environmental management according to claim 1, characterized in that: and arranging a temperature and humidity monitor on a construction site to control the retention time after the cleaning agent is sprayed.
4. The exposed aggregate permeable concrete construction method for water environmental management according to claim 3, characterized in that: in the step 1), P.O 42.5.5-grade cement is used for stirring, the particle size of aggregate is 6-8mm, the aggregate is pre-screened and cleaned, and oversized aggregate and stone powder are removed so as not to influence water permeability.
5. The exposed aggregate permeable concrete construction method for water environmental management according to claim 4, characterized in that: in the step 1), the exposed aggregate pervious concrete is prepared according to the following formula:
wherein mg, mc, mf and mw are the dosage of coarse aggregate, cement, reinforcing agent and water in the concrete of unit volume, and the unit is kg;
ρg、ρc、ρf、ρwthe apparent densities of the coarse aggregate, the cement, the reinforcing agent and the water are respectively expressed in kg/m 3; p refers to the target porosity, taken as 15%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111072333A (en) * | 2019-12-26 | 2020-04-28 | 苏州基业生态园林股份有限公司 | Permeable concrete structure and preparation process thereof |
| CN114369979A (en) * | 2022-01-10 | 2022-04-19 | 中交一公局第八工程有限公司 | Exposed aggregate permeable concrete pavement and construction process thereof |
| CN115217012A (en) * | 2021-04-19 | 2022-10-21 | 沪望海绵城市科技有限公司 | Sponge city permeable ground and pouring method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111072333A (en) * | 2019-12-26 | 2020-04-28 | 苏州基业生态园林股份有限公司 | Permeable concrete structure and preparation process thereof |
| CN115217012A (en) * | 2021-04-19 | 2022-10-21 | 沪望海绵城市科技有限公司 | Sponge city permeable ground and pouring method thereof |
| CN114369979A (en) * | 2022-01-10 | 2022-04-19 | 中交一公局第八工程有限公司 | Exposed aggregate permeable concrete pavement and construction process thereof |
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Application publication date: 20201204 |