CN114369979A - Exposed aggregate permeable concrete pavement and construction process thereof - Google Patents
Exposed aggregate permeable concrete pavement and construction process thereof Download PDFInfo
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- CN114369979A CN114369979A CN202210021999.2A CN202210021999A CN114369979A CN 114369979 A CN114369979 A CN 114369979A CN 202210021999 A CN202210021999 A CN 202210021999A CN 114369979 A CN114369979 A CN 114369979A
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- 239000004567 concrete Substances 0.000 title claims abstract description 64
- 238000010276 construction Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008569 process Effects 0.000 title claims abstract description 14
- 239000011380 pervious concrete Substances 0.000 claims abstract description 58
- 239000004576 sand Substances 0.000 claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 35
- 238000001914 filtration Methods 0.000 claims abstract description 23
- 239000004575 stone Substances 0.000 claims abstract description 21
- 239000004743 Polypropylene Substances 0.000 claims abstract description 8
- -1 polypropylene Polymers 0.000 claims abstract description 8
- 229920001155 polypropylene Polymers 0.000 claims abstract description 8
- 229920002635 polyurethane Polymers 0.000 claims abstract description 7
- 239000004814 polyurethane Substances 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims abstract description 6
- 239000011148 porous material Substances 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 96
- 239000002985 plastic film Substances 0.000 claims description 24
- 229920006255 plastic film Polymers 0.000 claims description 24
- 239000002344 surface layer Substances 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 18
- 239000012459 cleaning agent Substances 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 11
- 238000005056 compaction Methods 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000012744 reinforcing agent Substances 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 239000000565 sealant Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 238000009415 formwork Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 231100000719 pollutant Toxicity 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 claims 1
- 230000035699 permeability Effects 0.000 abstract description 14
- 210000000988 bone and bone Anatomy 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 239000004588 polyurethane sealant Substances 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a bone exposed permeable concrete pavement and a construction process thereof, and the bone exposed permeable concrete pavement comprises a 200 mm-thick graded broken stone cushion layer at the bottom layer, wherein a sand filter layer, a strength C25 permeable concrete layer and a strength C25 bone exposed permeable concrete layer are sequentially arranged above the broken stone cushion layer, and a polypropylene polyurethane colorless transparent layer is sprayed on the top layer; the sand filtering layer is a medium sand filtering layer and a coarse sand filtering layer, wherein the weight ratio of the medium sand filtering layer to the coarse sand filtering layer is 1: (0.2-2) medium grits and coarse grits, the medium grits having a grain size of 0.25-0.5mm and the coarse grits having a grain size of 0.5-2 mm; the material grain size of the strength C25 pervious concrete layer is 10 +/-2 mm, and the material grain size of the strength C25 exposed aggregate pervious concrete layer is 5-8 mm. Through the matching of multiple concrete layers with different particle sizes, a unique pore structure is formed, the water permeability of the exposed-bone water-permeable concrete pavement is improved, the water permeability can reach 32-52L/square meter/h, and the problems of drainage of rainfall, wet slip and water splashing caused by accumulated water on urban roads and light reflection caused by vehicle lights at night can be easily relieved.
Description
Technical Field
The invention relates to the technical field of pavement structure construction, in particular to a bone material exposed water-permeable concrete pavement and a construction process thereof.
Background
The exposed aggregate permeable concrete paving system is porous, light and non-fine aggregate concrete, and has the characteristics of water permeability, air permeability, sound absorption, noise reduction, flood disaster resistance, urban 'heat island effect' alleviation, light weight and the like. The pervious concrete pavement is attractive in whole, has good economic benefit and ecological environment benefit, and is a creative material for recovering the ecological environment which is continuously damaged.
At present, the exposed aggregate pervious concrete for road construction is less researched, influence factors and mechanical properties of the exposed aggregate pervious concrete for road construction and the like are researched, and the influence of different cement using amounts, fly ash, ultra-fine sand mixing amounts and the like on the strength and the permeability coefficient of the pervious concrete is analyzed: the compressive strength and the flexural strength of the pervious concrete are both increased along with the increase of the cement dosage, and the water permeability coefficient is reduced along with the increase of the cement dosage; the coal ash and the mineral powder are used for replacing cement to prepare the pervious concrete, the compressive strength of the pervious concrete at 7d and 28d is reduced, and the early strength is obviously reduced; the interior of the pervious concrete can be more compact by doping extra fine sand and machine-made sand, so that the compressive strength of the pervious concrete is improved; when extra fine sand and machine-made sand are used for double mixing, the enhancement effect is greater than that of single mixing. The effect of aggregate on the main properties of pervious concrete was studied by schlemma. The Zhouqiang researches the preparation technology and construction process of pervious concrete aiming at the current research situation of pervious concrete at home and abroad. And (3) analyzing and researching various influence factors of the porosity and the permeability coefficient of the pervious concrete by dawnia and the like, and performing curve fitting according to experimental data to obtain a change rule between the porosity and the permeability coefficient. Zhanchaohui et al studied the effect of different water-cement ratios, cementitious materials and aggregate properties on the strength and water permeability of pervious concrete. Liuxia et al demonstrated the effect of cement dosage, water-cement ratio on pervious concrete strength, permeability coefficient and porosity.
When carrying out exposed aggregate pavement structure construction, need use construction process to help the workman to be under construction according to the order, guarantee the construction effect, but current construction process operation is complicated, and the effect is general after the construction is accomplished, has certain limitation during the use.
Disclosure of Invention
In view of the above problems in the prior art, it is an object of the present invention to provide a bare aggregate permeable concrete pavement.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a bone exposed material permeable concrete pavement comprises a 200mm thick graded broken stone cushion layer at the bottom layer, a sand filter layer, a strength C25 permeable concrete layer and a strength C25 bone exposed material permeable concrete layer are sequentially arranged above the broken stone cushion layer, and a polypropylene polyurethane colorless transparent layer is sprayed on the top layer;
the sand filtering layer is a medium sand filtering layer and a coarse sand filtering layer, wherein the weight ratio of the medium sand filtering layer to the coarse sand filtering layer is 1: (0.2-2) medium grits and coarse grits, the medium grits having a grain size of 0.25-0.5mm and the coarse grits having a grain size of 0.5-2 mm; the material grain size of the strength C25 pervious concrete layer is 10 +/-2 mm, and the material grain size of the strength C25 exposed aggregate pervious concrete layer is 5-8 mm;
the C25 exposed aggregate pervious concrete layer is composed of the following raw materials in percentage by weight: 15-20% of cement, 72-80% of natural aggregate, 0.6-1.0% of reinforcing agent and the balance of water, wherein the particle size of the natural aggregate is 5-10 mm.
Further, the material particle size of the strength C25 pervious concrete layer is 10mm, and the material particle size of the strength C25 exposed aggregate pervious concrete layer is 6 mm.
Furthermore, the thickness of the sand filter layer is 20-40 mm, the thickness of the C25 pervious concrete layer is 80-120 mm, and the thickness of the C25 exposed aggregate pervious concrete layer is 20-40 mm.
Furthermore, the thickness of the sand filter layer is 30mm, the thickness of the C25 pervious concrete layer is 90mm, and the thickness of the C25 exposed aggregate pervious concrete layer is 30 mm.
The invention also aims to provide a construction process of the exposed aggregate permeable concrete pavement, which comprises the following steps:
(1) leveling of substrate
Strictly checking the designed elevation on site, and checking the leveling condition of the foundation; compacting the flattened foundation by rolling, and inspecting the bearing capacity of the foundation by adopting a ring cutter method, wherein the degree of compaction is required to be not lower than 93%;
(2) paving broken stone cushion layer
Paving graded broken stones with the thickness of 200mm strictly according to the requirements of a design drawing, rolling and compacting by using a road roller, and inspecting the compaction degree of a broken stone cushion by adopting a sand filling method, wherein the compaction degree is required to be not lower than a design required value;
(3) laying sand filtering layer
Laying a medium and coarse sand filter layer with the thickness of 30mm above the broken stone cushion layer for leveling, cleaning and shoveling away pollutants or impurities on the surface of the cushion layer, spraying water in a proper amount and compacting the flat vibrator by rolling and vibrating;
(4) erecting formwork and presetting expansion joint
(5) Paving exposed aggregate permeable concrete layer
A. Stirring: stirring and feeding materials on site according to the mixing proportion of the C25 exposed aggregate pervious concrete, adopting a forced stirrer for 4-6min, putting all materials without the reinforcing agent in the stirrer, adding water while stirring, adding the reinforcing agent after the surfaces of all the materials are wet, stirring for at least one minute, and then adding water properly according to the workability of the mixture until the mixture meets the requirement;
B. before paving, the sand cushion is wetted by water; uniformly paving a 90mm thick 10mm grain size strength C25 pervious concrete base layer on the sand cushion layer after water spraying, and tamping by using a hand-push type tamper;
the reason is that the amount of stirring water in the exposed aggregate permeable concrete is limited, if the roadbed material absorbs part of the stirring water in the exposed aggregate permeable concrete, the coagulation of the cement is accelerated, the time for pavement pouring, vibrating, compacting and jointing is shortened, and the bonding strength among aggregates is weakened due to rapid water loss.
C. Paving: then synchronously paving the pervious concrete with the thickness of 30mm and the grain diameter of 6mm, leveling by using a hanging bar, and performing material supplementing treatment on the place with insufficient compactness of the surface layer; and (4) adopting a concrete light-receiving machine to carry out light-receiving treatment on the surface layer, and manually receiving light near two sides of the curbstone. The area of once paving is not too large, and the next working surface is not needed to be performed urgently before the last stirring material is not processed, so that the phenomenon of obvious joint is avoided.
D. Strictly controlling the construction time of the high-strength C25 pervious concrete base layer and the exposed aggregate pervious concrete surface layer within 25-60 min to ensure the bonding strength;
E. the surface layer exposed aggregate permeable concrete is compacted by vibration of a friction vibration leveling machine, and the part with larger pores is compacted by manual leveling, so that the flatness and the strength of a working surface are ensured; after paving the surface concrete, coating and watering combined maintenance should be carried out, and the maintenance should be carried out at least 7 days after the concrete falls to the ground at the latest 30 min;
(6) cleaning surface layer
(7) Gap cleaning: keeping the concrete in dry state, and filling the seam with polyurethane soft glue.
And (3) further, presetting expansion gaps in the step (4), reserving the expansion gaps according to design requirements and a construction scheme before pouring the pervious concrete, treating each gap by adopting a settlement gap, and enabling the width of each gap to be 15 mm.
Further, cleaning the surface layer: spraying the exposed aggregate cleaning agent by using an air pump, immediately covering the cleaning agent by using a plastic film after the cleaning agent is sprayed, covering the plastic film for the second time by using color stripe cloth, and flushing the plastic film by using a high-pressure water gun after the cleaning agent is sprayed for 36 hours;
the washing is carried out in sequence, a section of plastic film is lifted first, 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; and after the flushing is finished, covering the plastic film again for maintenance, wherein the plastic film covered again can not be flushed by adopting a cleaning agent.
Further, after the surface concrete is cured and the expansion joint is finished, the surface is sprayed with the sealant, the surface is cleaned by a high-pressure cleaning machine, and after the surface is dried for 6 to 24 hours, the polypropylene polyurethane sealant can be coated by rolling or spraying, wherein the dosage of the polypropylene polyurethane sealant is about 0.2Kg/m2Before use, the mixture is stirred uniformly.
Compared with the prior art, the invention has the following advantages:
firstly, a broken stone cushion layer and a medium-coarse sand filter layer are sequentially laid on a base layer of the pavement structure, a permeable concrete layer with the grain diameter of 10 +/-2 mm and an exposed aggregate concrete layer with the grain diameter of about 6mm are firstly laid above the sand filter layer, and a unique pore structure is formed by matching a plurality of concrete layers with different grain diameters, so that the water permeability of the exposed aggregate permeable concrete pavement is improved, the water permeability can reach 32-52 liters per square meter per hour, and the problems of drainage of rainfall, wet slip and water splashing caused by urban road ponding and light reflection caused by night vehicle lamplight can be easily relieved.
Secondly, in the construction process of the exposed aggregate pervious concrete pavement, the natural aggregate is taken as a main material of the exposed aggregate pervious concrete, the cement is taken as a main cementing material, the point connection of the high-strength aggregate is realized, the arrangement of the surface aggregate is improved through strict construction control, the exposed aggregate pervious concrete has the concrete strength of more than C25, 15-20% of gaps are formed in the structure, and the exposed aggregate pervious concrete pavement has excellent water permeability. The prepared aggregate-exposed permeable concrete pavement has good bearing capacity, aggregates are not easy to fall off, and the construction quality is effectively improved.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Embodiment 1 the construction process of the exposed aggregate pervious concrete pavement comprises the following steps:
(1) leveling of substrate
Strictly checking the designed elevation on site, and checking the leveling condition of the foundation; compacting the flattened foundation by rolling, and inspecting the bearing capacity of the foundation by adopting a ring cutter method, wherein the degree of compaction is required to be not lower than 93%;
(2) paving broken stone cushion layer
Paving graded broken stones with the thickness of 200mm strictly according to the requirements of a design drawing, rolling and compacting by using a road roller, and inspecting the compaction degree of a broken stone cushion by adopting a sand filling method, wherein the compaction degree is required to be not lower than a design required value;
(3) laying sand filtering layer
Laying a medium and coarse sand filter layer with the thickness of 30mm above the broken stone cushion layer for leveling, cleaning and shoveling away pollutants or impurities on the surface of the cushion layer, spraying water in a proper amount and compacting the flat vibrator by rolling and vibrating;
(4) erecting formwork and presetting expansion joint
The positions of the expansion joints are reserved according to design requirements and construction schemes before the pervious concrete is poured, each joint is treated by adopting a settlement joint, and the width of each joint is 15 mm.
(5) Paving exposed aggregate permeable concrete layer
A. Stirring: stirring and feeding materials on site according to the mixing proportion of the C25 exposed aggregate pervious concrete, adopting a forced stirrer for 4-6min, putting all materials without the reinforcing agent in the stirrer, adding water while stirring, adding the reinforcing agent after the surfaces of all the materials are wet, stirring for at least one minute, and then adding water properly according to the workability of the mixture until the mixture meets the requirement;
B. before paving, the sand cushion is wetted by water; uniformly paving a 90mm thick 10mm grain size strength C25 pervious concrete base layer on the sand cushion layer after water spraying, and tamping by using a hand-push type tamper;
the reason is that the amount of stirring water in the exposed aggregate permeable concrete is limited, if the roadbed material absorbs part of the stirring water in the exposed aggregate permeable concrete, the coagulation of the cement is accelerated, the time for pavement pouring, vibrating, compacting and jointing is shortened, and the bonding strength among aggregates is weakened due to rapid water loss.
C. Paving: then synchronously paving the pervious concrete with the thickness of 30mm and the grain diameter of 6mm, leveling by using a hanging bar, and performing material supplementing treatment on the place with insufficient compactness of the surface layer; and (4) adopting a concrete light-receiving machine to carry out light-receiving treatment on the surface layer, and manually receiving light near two sides of the curbstone. The area of once paving is not too large, and the next working surface is not needed to be performed urgently before the last stirring material is not processed, so that the phenomenon of obvious joint is avoided.
D. Strictly controlling the construction time of the high-strength C25 pervious concrete base layer and the exposed aggregate pervious concrete surface layer within 25-60 min to ensure the bonding strength;
E. the surface layer exposed aggregate permeable concrete is compacted by vibration of a friction vibration leveling machine, and the part with larger pores is compacted by manual leveling, so that the flatness and the strength of a working surface are ensured; after paving the surface concrete, coating and watering combined maintenance should be carried out, and the maintenance should be carried out at least 7 days after the concrete falls to the ground at the latest 30 min;
(6) cleaning surface layer
Spraying the exposed aggregate cleaning agent by using an air pump, immediately covering the cleaning agent by using a plastic film after the cleaning agent is sprayed, covering the plastic film for the second time by using color stripe cloth, and flushing the plastic film by using a high-pressure water gun after the cleaning agent is sprayed for 36 hours;
the washing is carried out in sequence, a section of plastic film is lifted first, 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; and after the flushing is finished, covering the plastic film again for maintenance, wherein the plastic film covered again can not be flushed by adopting a cleaning agent.
(7) Gap cleaning: keeping the concrete in dry state, and filling the seam with polyurethane soft glue.
(8) After the surface concrete is cured and the expansion joint is finished, the surface is sprayed with a sealant, the surface is cleaned by a high-pressure cleaning machine, and after drying for 6 to 24 hours, the polypropylene polyurethane sealant can be coated by rolling or spraying, wherein the dosage of the polypropylene polyurethane sealant is about 0.2Kg/m2Before use, the mixture is stirred uniformly.
Example 2
The exposed aggregate pervious concrete pavement is obtained by adopting the construction process of the embodiment 1, and comprises a 200 mm-thick graded broken stone cushion layer at the bottom layer, a 30 mm-thick sand filter layer, a 90 mm-thick 10 mm-particle-size-strength C25 pervious concrete layer and a 30 mm-thick 6 mm-particle-size-strength C25 exposed aggregate pervious concrete layer are sequentially arranged above the bottom layer, and a polypropylene polyurethane colorless transparent layer is sprayed on the top layer.
The sand filtering layer is a medium sand filtering layer and a coarse sand filtering layer, wherein the weight ratio of the medium sand filtering layer to the coarse sand filtering layer is 1: 1, the medium grit has a grain size of 0.25-0.5mm and the coarse grit has a grain size of 0.5-2 mm.
The C25 exposed aggregate permeable concrete layer is composed of the following raw materials in percentage by weight as shown in the following table 1.
| Name of Material | 42.5 Cement | Stone (Natural aggregate) | Reinforcing agent | Water (W) |
| The dosage per cubic meter | 378kg | 1650kg | 16kg | 137kg |
| The dosage of each material | 100kg | 436kg | 4.2kg | 36.2kg |
The exposed aggregate pervious concrete pavement prepared in the example 2 is subjected to a bearing capacity test, and the result is as follows:
the aggregate of the surface layer is completely exposed, and no particles fall off; the water permeability can reach 46L/square meter/h, the bearing capacity of the concrete pavement can completely meet the bearing requirement of C25 concrete required by 'inspection and acceptance regulations of construction quality of pedestrian road engineering on Tianjin urban roads', and the bearing capacity is higher than that of a common water permeable brick.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The exposed aggregate permeable concrete pavement is characterized by comprising a 200 mm-thick graded broken stone cushion layer at the bottom layer, wherein a sand filter layer, a strength C25 permeable concrete layer and a strength C25 exposed aggregate permeable concrete layer are sequentially arranged above the broken stone cushion layer, and a polypropylene polyurethane colorless transparent layer is sprayed on the top layer;
the sand filtering layer is a medium sand filtering layer and a coarse sand filtering layer, wherein the weight ratio of the medium sand filtering layer to the coarse sand filtering layer is 1: (0.2-2) medium grits and coarse grits, the medium grits having a grain size of 0.25-0.5mm and the coarse grits having a grain size of 0.5-2 mm; the material grain size of the strength C25 pervious concrete layer is 10 +/-2 mm, and the material grain size of the strength C25 exposed aggregate pervious concrete layer is 5-8 mm;
the C25 exposed aggregate pervious concrete layer is composed of the following raw materials in percentage by weight: 15-20% of cement, 72-80% of natural aggregate, 0.6-1.0% of reinforcing agent and the balance of water, wherein the particle size of the natural aggregate is 5-10 mm.
2. The exposed aggregate permeable concrete pavement of claim 1, wherein the material grain size of the strength C25 permeable concrete layer is 10mm, and the material grain size of the strength C25 exposed aggregate permeable concrete layer is 6 mm.
3. The exposed aggregate permeable concrete pavement according to claim 1, wherein the sand filter layer is 20-40 mm thick, the C25 permeable concrete layer is 80-120 mm thick, and the C25 exposed aggregate permeable concrete layer is 20-40 mm thick.
4. The exposed aggregate permeable concrete pavement of claim 3, wherein the sand filter layer is 30mm thick, the C25 permeable concrete layer is 90mm thick, and the C25 exposed aggregate permeable concrete layer is 30mm thick.
5. The construction process of the exposed aggregate permeable concrete pavement according to claim 1, which is characterized by comprising the following steps:
(1) leveling of substrate
Strictly checking the designed elevation on site, and checking the leveling condition of the foundation; compacting the flattened foundation by rolling, and inspecting the bearing capacity of the foundation by adopting a ring cutter method, wherein the degree of compaction is required to be not lower than 93%;
(2) paving broken stone cushion layer
Paving graded broken stones with the thickness of 200mm strictly according to the requirements of a design drawing, rolling and compacting by using a road roller, and inspecting the compaction degree of a broken stone cushion by adopting a sand filling method, wherein the compaction degree is required to be not lower than a design required value;
(3) laying sand filtering layer
Laying a medium and coarse sand filter layer with the thickness of 30mm above the broken stone cushion layer for leveling, cleaning and shoveling away pollutants or impurities on the surface of the cushion layer, spraying water in a proper amount and compacting the flat vibrator by rolling and vibrating;
(4) erecting formwork and presetting expansion joint
(5) Paving exposed aggregate permeable concrete layer
A. Stirring: stirring and feeding materials on site according to the mixing proportion of the C25 exposed aggregate pervious concrete, adopting a forced stirrer for 4-6min, putting all materials without the reinforcing agent in the stirrer, adding water while stirring, adding the reinforcing agent after the surfaces of all the materials are wet, stirring for at least one minute, and then adding water properly according to the workability of the mixture until the mixture meets the requirement;
B. before paving, the sand cushion is wetted by water; uniformly paving a 90mm thick 10mm grain size strength C25 pervious concrete base layer on the sand cushion layer after water spraying, and tamping by using a hand-push type tamper;
C. paving: then synchronously paving the pervious concrete with the thickness of 30mm and the grain diameter of 6mm, leveling by using a hanging bar, and performing material supplementing treatment on the place with insufficient compactness of the surface layer; adopting a concrete light-receiving machine to carry out light-receiving treatment on the surface layer, and manually receiving light near two sides of the curbstone;
strictly controlling the construction time of the high-strength C25 pervious concrete base layer and the exposed aggregate pervious concrete surface layer within 25-60 min to ensure the bonding strength;
D. the surface layer exposed aggregate permeable concrete is compacted by vibration of a friction vibration leveling machine, and the part with larger pores is compacted by manual leveling, so that the flatness and the strength of a working surface are ensured; after paving the surface concrete, coating and watering combined maintenance should be carried out, and the maintenance should be carried out at least 7 days after the concrete falls to the ground at the latest 30 min;
(6) cleaning surface layer
(7) Gap cleaning: keeping the concrete in dry state, and filling the seam with polyurethane soft glue.
6. The construction process of the exposed aggregate pervious concrete pavement according to claim 5, wherein expansion joints are preset in the step (4), the positions of the expansion joints are reserved according to design requirements and a construction scheme before the pervious concrete is poured, each joint is treated by adopting a settlement joint, and the width of each joint is 15 mm.
7. The construction process of the exposed aggregate permeable concrete pavement according to claim 5, wherein the surface layer is cleaned: spraying the exposed aggregate cleaning agent by using an air pump, immediately covering the cleaning agent by using a plastic film after the cleaning agent is sprayed, covering the plastic film for the second time by using color stripe cloth, and flushing the plastic film by using a high-pressure water gun after the cleaning agent is sprayed for 36 hours;
the washing is carried out in sequence, a section of plastic film is lifted first, 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; and after the flushing is finished, covering the plastic film again for maintenance, wherein the plastic film covered again can not be flushed by adopting a cleaning agent.
8. The construction process of the exposed aggregate pervious concrete pavement according to claim 5, wherein after the concrete curing of the surface layer and the expansion joint are finished, the surface is subjected toSpraying the sealant, cleaning with a high pressure cleaner, drying for 6-24 hr, and brushing the sealant with the amount of 0.2Kg/m2Before use, the mixture is stirred uniformly.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116290659A (en) * | 2023-03-06 | 2023-06-23 | 湖北路城建设科技有限公司 | Washing-free exposed bone material artistic floor and paving method thereof |
| CN116290659B (en) * | 2023-03-06 | 2024-05-10 | 湖北路城建设科技有限公司 | Washing-free exposed bone material artistic floor and paving method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004076482A (en) * | 2002-08-21 | 2004-03-11 | Akira Takahashi | Concrete pavement having water-retention function |
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| CN116290659B (en) * | 2023-03-06 | 2024-05-10 | 湖北路城建设科技有限公司 | Washing-free exposed bone material artistic floor and paving method thereof |
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