CN113105187A

CN113105187A - Permeable pavement paving layer and preparation method thereof

Info

Publication number: CN113105187A
Application number: CN202110398350.8A
Authority: CN
Inventors: 兰普添; 徐智勇; 徐绪; 胡少飞
Original assignee: Wuhan Laidao Building Materials Technology Co ltd
Current assignee: Wuhan Laidao Building Materials Technology Co ltd
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2021-07-13
Anticipated expiration: 2041-04-08
Also published as: CN113105187B

Abstract

The invention provides a permeable pavement paving layer, which comprises a first layer, wherein the first layer is paved above a plain soil compacted layer or a broken stone cushion layer, and comprises the following components: 15-30% of cement, 15-35% of admixture, 30-60% of aggregate, 7-12% of water, and also comprises fiber, foaming agent, foam stabilizer and water reducer. The weight of the fiber is 0.5-3% of the weight of the gel material, the weight of the foaming agent is 0.02-0.14% of the weight of the gel material, the weight of the foam stabilizer is 0.02-0.35% of the weight of the gel material, and the weight of the water reducing agent is 0.03-0.8% of the weight of the gel material, wherein the sum of the cement and the admixture is called as the gel material. The permeable pavement paving layer has a porous structure, can absorb sound waves and reduce noise, has good water permeability, water filtration and water storage capacity, can realize comprehensive utilization of water resources, and has good durability; the permeable pavement paving layer material has low density which is lower than the density of the conventional permeable concrete, and high breaking strength, is directly poured on a plain soil tamping layer, a gravel cushion layer or a cement stabilized gravel layer, and can save materials and construction period to a great extent.

Description

Permeable pavement paving layer and preparation method thereof

Technical Field

The invention relates to the technical field of concrete, in particular to energy-saving and environment-friendly pervious concrete and a preparation method thereof.

Background

Sponge city construction is widely advocated in China at present, and permeable pavement is an important source control technology under the concept of 'sponge city'. At present, the permeable pavement system is widely applied to the fields of parks, sidewalks, roadways, parking lots, squares and the like. Traditional permeable pavement structure from down up includes plain soil layer, rubble bed course, the concrete structure layer that permeates water and the finish coat that permeates water in proper order. The paving structure is complex, the construction is complex and the period is long, and the paving can be completed only by investing more manpower, material resources and time.

Disclosure of Invention

The invention provides a permeable pavement layer, which is characterized in that the prepared permeable pavement layer is directly poured on a plain soil tamped layer or a gravel cushion layer (or a cement stabilized gravel layer) by adopting a cast-in-place process, the structure of the pavement layer is simple, the fluidity of the pavement layer material is good, the pavement layer can automatically level or be leveled, and the density of the pavement layer is only 1300kg/m plus 300-³The density of the concrete is lower than that of the conventional pervious concrete, the breaking strength is high, the breaking strength which is the same as or higher than that of the common concrete for the pavement can be achieved, and the materials and the construction period can be saved to a great extent. The used material is porous pore structure in the structure of should mating formation, can absorb the sound wave noise abatement, still possesses good ability of permeating water, drainage and retaining, can realize the comprehensive utilization of water resource, and the durability is good. The permeable pavement paving layer disclosed by the invention has the advantages of long service life, environmental friendliness and simplicity in repair.

The utility model provides a permeable pavement paving layer, includes first layering, first layering is laid in native rammed earth layer or rubble bed course top, first layering includes following component according to weight ratio:

wherein the sum of the cement and admixture is referred to as a first layered gel material.

The first layered structure also comprises fibers, a foaming agent, a foam stabilizer and a water reducing agent, wherein the fibers account for 0.5-3% of the weight of the first layered gel material, the foaming agent accounts for 0.02-0.14% of the weight of the first layered gel material, the foam stabilizer accounts for 0.02-0.35% of the weight of the first layered gel material, and the water reducing agent accounts for 0.03-0.8% of the weight of the first layered gel material.

Further, the permeable pavement paving layer comprises a second layer, the second layer is laid between the first layer and the soil compacting layer or the gravel cushion layer, and the second layer comprises the following components in percentage by weight:

wherein the sum of the cement and admixture is referred to as a second layered gel material.

The second layered structure also comprises fibers, a foaming agent, a foam stabilizer and a water reducing agent, wherein the fibers account for 0.5-3% of the weight of the second layered gel material, the foaming agent accounts for 0.1-0.32% of the weight of the second layered gel material, the foam stabilizer accounts for 0.02-0.35% of the weight of the second layered gel material, and the water reducing agent accounts for 0.03-0.8% of the weight of the second layered gel material.

Further, the permeable pavement paving layer further comprises a third layer, the third layer is laid between the second layer and the soil compacting layer or the gravel cushion layer, and the third layer comprises the following components in percentage by weight:

wherein the sum of the cement and admixture is referred to as a third layered gel material.

The third layered gel material also comprises fibers, a foaming agent, a foam stabilizer and a water reducing agent, wherein the fibers account for 0.5-3% of the weight of the third layered gel material, the foaming agent accounts for 0.19-0.5% of the weight of the third layered gel material, the foam stabilizer accounts for 0.02-0.35% of the weight of the third layered gel material, and the water reducing agent accounts for 0.03-0.8% of the weight of the third layered gel material.

Further, when the permeable pavement paving layer is composed of the first sub-layer and the second sub-layer, the density of the first sub-layer is greater than that of the second sub-layer.

Further, when the permeable pavement paving layer is composed of the first layer, the second layer and the third layer, the density of the first layer is greater than that of the second layer, and the density of the second layer is greater than that of the third layer.

Further, the thickness of the first sub-layer of the permeable pavement paving layer is 150-400mm, and the density is 800-1300kg/m³。

Preferably, the density of the first sub-layer of the permeable pavement paving layer is 1000-³。

Further, the thickness of the first sub-layer of the permeable pavement paving layer is 50-350mm, and the density is 800-1300kg/m³The thickness of the second layer is 100-300mm, and the density is 400-900kg/m³。

Preferably, the density of the first sub-layer of the permeable pavement paving layer is 1000-³The density of the second layer is 800-900kg/m³。

Further, the thickness of the first layer of the permeable pavement paving layer is 50-150mm, and the density is 800-³The thickness of the second layer is 50-200mm, and the density is 500-900kg/m³The thickness of the third layer is 50-350mm, and the density is 300-³。

Preferably, the density of the first sub-layer of the permeable pavement paving layer is 1000-³The density of the second layer is 500-900kg/m³The density of the third layer is 500-600kg/m³。

The first layer cement, the second layer cement and the third layer cement are at least one of ordinary portland cement, aluminate cement, sulphoaluminate cement, phosphate cement and the like.

Further, the first layered admixture, the second layered admixture and the third layered admixture are at least mineral powder, fly ash, silicon powder and CaSO₄Powder, volume stabilizer, etc.

Furthermore, the first layered aggregate, the second layered aggregate and the third layered aggregate are all selected from one of quartz sand, carborundum or pottery sand with at least 20-120 meshes.

Furthermore, the first layered fiber, the second layered fiber and the third layered fiber are all selected from at least one of polypropylene fiber, polyvinyl alcohol fiber, polyethylene fiber, polyvinyl alcohol fiber, polyformaldehyde fiber, glass fiber, graphene fiber, carbon fiber and the like, and the fiber length of the fibers is 1.5-30 mm.

Further, the first layered foaming agent, the second layered foaming agent and the third layered foaming agent are all selected from a compound or animal protein foaming agent.

The first layered foam stabilizer, the second layered foam stabilizer and the third layered foam stabilizer are each selected from at least one of polymer ethers such as hydroxypropyl methylcellulose ether, methylcellulose or silicone amide, alcohols and amines (ammonia).

Further, the first stratified water reducing agent, the second stratified water reducing agent and the third stratified water reducing agent are all selected from one of polycarboxylic acid high-efficiency water reducing agents, sodium lignosulphonates or naphthalene high-efficiency water reducing agents and the like.

A preparation method of a permeable pavement paving layer comprises the following steps:

s1: adding the first layered foaming agent and water into a foaming machine according to a proportion to prepare foam; weighing the first-layered cement, the admixture, the aggregate and the fibers in proportion, adding into a stirrer, performing dry stirring, adding the first-layered water reducing agent, the foam stabilizer and the mixing water, and stirring; adding the prepared foam into a stirring pot according to a certain amount, and continuously stirring uniformly to obtain a first layering layer.

Further, the preparation method of the permeable pavement paving layer further comprises the following steps:

s01: adding the second layered foaming agent and water into a foaming machine according to a proportion to prepare rich and fine foam; weighing and adding the second layered cement, the second layered admixture, the second layered aggregate and the second layered fiber into a stirrer according to a proportion, performing dry stirring, adding the second layered water reducer, the second layered foam stabilizer and the mixing water, and stirring; adding the prepared foam into a stirring pot according to a certain amount, and continuously stirring uniformly to obtain a second layering layer; and pouring the second layer above the rammed earth layer or the gravel cushion layer, and pouring the first layer on the second layer. S01 is a step performed before S1.

s001: adding the third layered foaming agent and water into a foaming machine according to a proportion to prepare rich and fine foam; weighing the third-layer cement, the third-layer admixture, the third-layer aggregate and the third-layer fiber according to a proportion, adding into a stirrer, performing dry stirring, adding a third-layer water reducing agent, a third-layer foam stabilizer and mixing water, and stirring; adding the prepared foam into a stirring pot according to a certain amount, and continuously stirring uniformly to obtain a third layering layer; and pouring the third layer on the rammed earth layer or the gravel cushion layer, pouring the second layer on the third layer, and pouring the first layer on the second layer. S001 is a step performed before S01.

Further, the ratio of the first layered foaming agent, the second layered foaming agent and the third layered foaming agent to water is 1:20 to 1: 100.

Further, the foam density is 0.02-0.08g/cm³。

Further, the dry stirring time is 30-60 s.

Further, carrying out secondary wet stirring when adding one of the first layered water reducing agent, the second layered water reducing agent or the third layered water reducing agent, the same layered foam stabilizing agent and the same layered water mixing water, firstly adding the water reducing agent, the foam stabilizing agent and 80-90% of water, stirring for 3-5min, and stirring into a thick slurry; then adding the rest 10-20% of water, stirring for 1-3min, and stirring the slurry to form a slurry state with the expansion degree of 160-300 mm.

The mixing stirring time was less than 3min after the addition of the prepared foam.

s2: after watering natural maintenance or moisture-keeping maintenance for 1-7 days, cutting shrinkage and expansion joints, wherein the width of the shrinkage joint is 1-5mm, and the depth is more than or equal to 1/3 of the thickness of the section; the expansion joint is 1-3cm deep and penetrates the whole cross section. And spraying hydrophilic finishing agent on the surface of the poured permeable pavement paving layer, namely the first layer, to perform hardening treatment, so that the surface strength and the attractiveness of the permeable pavement paving layer are improved.

Further, the first layered casting thickness is 150-400 mm.

Further, the thickness of the first layered casting is 50-350mm, and the thickness of the second layered casting is 100-300 mm.

Furthermore, the first layered casting thickness is 50-150mm, the second layered casting thickness is 50-200mm, and the third layered casting thickness is 100-350 mm.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a structural layer of a permeable pavement paving layer of example 1, wherein 1 is a first layered layer in the example 1;

FIG. 2 is a structural layer of a permeable pavement layer of example 6, wherein 2 is a first layer and 3 is a second layer in example 6;

fig. 3 shows a structure layer of a permeable pavement layer of example 7, wherein 4 is a first layer, 5 is a second layer, and 6 is a third layer in example 7.

Detailed Description

Various embodiments of the present disclosure will be described more fully hereinafter. The present disclosure is capable of various embodiments and of modifications and variations therein. However, it should be understood that: there is no intention to limit the various embodiments of the disclosure to the specific embodiments disclosed herein, but rather, the disclosure is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the disclosure.

Hereinafter, the term "includes" or "may include" used in various embodiments of the present disclosure indicates the presence of the disclosed functions, operations, or elements, and does not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of the present disclosure, the terms "comprising," "having," and their derivatives, are intended to be only representative of the particular features, integers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to one or more other features, integers, steps, operations, elements, components, or combinations of the foregoing.

In various embodiments of the disclosure, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.

The terminology used in the various embodiments of the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the present disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present disclosure belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined in various embodiments of the present disclosure.

Example 1

The permeable pavement layer includes only the first layer. Referring to fig. 1, fig. 1 is a structural layer of the permeable pavement paving layer of example 1, wherein 1 is a first layer in this example.

The components and contents of the first layer 1 in this example are shown in the following table:

ingredient table 1

First layered cement	Portland cement	15％
			First layered admixture	Mineral powder	18％
First layered aggregate	40-120 mesh pottery sand	60％
			First stratified water		7％

The first layer also comprises polypropylene fiber, a composite foaming agent, a hydroxypropyl methyl cellulose ether foam stabilizer and a polycarboxylic acid high-efficiency water reducing agent, wherein the polypropylene fiber accounts for 3% of the weight of the gel material, the composite foaming agent accounts for 0.02% of the weight of the gel material, the hydroxypropyl methyl cellulose ether accounts for 0.02% of the weight of the gel material, and the polycarboxylic acid high-efficiency water reducing agent accounts for 0.8% of the weight of the gel material.

The preparation method of the permeable pavement paving layer comprises the following steps:

adding the first layered foaming agent and water into a foaming machine according to the volume ratio of 1:20 to prepare rich and fine foam, wherein the foam density is 0.02g/cm³；

And weighing the first layered cement, the first layered admixture, the first layered aggregate and the first layered fiber in proportion, adding into a stirrer, and dry-stirring for 30 s. Adding a first layered water reducing agent, a first layered foam stabilizer and 80% of water, stirring for 3min, and stirring into a thick slurry;

then adding the rest 20% of water, stirring for 2min, and stirring into a slurry state, wherein the expansion degree is 300 mm;

finally, adding the prepared foam into a stirring pot, and continuously mixing and stirring for 2min till the foam is uniform, thereby obtaining first layered slurry; and pouring the first layered slurry on the rammed earth layer or the gravel cushion layer (or the cement-stabilized gravel layer) to obtain the permeable pavement paving layer of the embodiment.

Wherein: the first layered casting thickness is 150mm, and the density of the first layered casting is 1300kg/m³。

After the pouring is finished, carrying out maintenance and post-treatment:

after watering natural maintenance or moisture-retaining maintenance for 3 days, cutting shrinkage and expansion joints, wherein the width of the shrinkage joints is 5mm, and the depth is 1/3 of the section thickness; the expansion joint is 1cm, and the depth penetrates through the whole section. And spraying hydrophilic finishing agent on the surface of the poured permeable pavement paving layer for hardening treatment, so that the surface strength and the attractiveness of the permeable pavement paving layer are improved.

Example 2

The embodiment provides a permeable pavement paving layer, which comprises a first layered layer.

This example differs from example 1 in that:

the types of the first layered cement and the specific gravity in the total component are different, the Portland cement is changed into Portland cement and aluminate cement, and the proportion in the total component is increased from 15% to 30%; the varieties of the admixtures in the first layer and the specific gravity of the total components are different, mineral powder is changed into fly ash, and the proportion of the admixtures in the total components is increased from 18% to 28%; the types and specific gravities of the first layered aggregate in the total composition are different, 40-120 meshes of ceramic sand is changed into 40-120 meshes of carborundum, and the proportion in the total composition is reduced from 60% to 30%; the specific gravity of the first layered water in the total components is different, and the proportion of the first layered water in the total components is increased to 12 percent again by 7 percent; the first layered fiber has different types and specific gravities, is changed from polypropylene fiber to polyethylene fiber, and has a specific gravity reduced to 0.5% from 3% of the weight of the gel material; the first layered foaming agent has different types and specific gravities, is changed from a composite foaming agent into an animal protein foaming agent, and has the specific gravity increased from 0.02 percent to 0.14 percent of the weight of the gel material; the first layered foam stabilizer has different types and specific gravities, is changed from hydroxypropyl methyl cellulose ether to methyl cellulose, and has a specific gravity increased from 0.02% to 0.35% of the weight of the gel material; the first layered water reducing agent has different types and specific gravities, and the specific gravity of the naphthalene-based high-efficiency water reducing agent is reduced from 0.8% to 0.03% of the weight of the gel material. The casting thickness of the first layer is different, and is changed from 150mm to 350 mm; the first fraction had a different density of 1300kg/m³It became 800kg/m³。

The components and contents of the first layer in this example are shown in the following table:

ingredient table 2

The first layer also comprises polyethylene fiber, an animal protein foaming agent, a methyl cellulose foam stabilizer and a naphthalene-series high-efficiency water reducing agent, wherein the polyethylene fiber accounts for 0.5 percent of the weight of the gel material, the animal protein foaming agent accounts for 0.14 percent of the weight of the gel material, the methyl cellulose accounts for 0.35 percent of the weight of the gel material, and the naphthalene-series high-efficiency water reducing agent accounts for 0.03 percent of the weight of the gel material.

adding the first layered foaming agent and water into a foaming machine according to the volume ratio of 1:100 to prepare rich and fine foam with the foam density of 0.08g/cm³；

Weighing the first layered cement, the first layered admixture, the first layered aggregate and the first layered fiber in proportion, adding into a stirrer, dry-stirring for 60s, adding the first layered water reducing agent, the first layered foam stabilizer and 80% of water, stirring for 5min, and stirring into thick slurry;

then adding the rest 20% of water, stirring for 2min to form a slurry state, wherein the expansion degree is 160 mm;

finally, adding the prepared foam into a stirring pot, and continuously mixing for 2min till the foam is uniform, thereby obtaining first layered slurry; and pouring the first layered slurry on the rammed earth layer or the gravel cushion layer (or the cement-stabilized gravel layer) to obtain the permeable pavement paving layer of the embodiment.

Wherein the first layered casting thickness is 350mm, and the density of the first layered casting is 800kg/m³。

After the pouring is finished, carrying out maintenance and post-treatment:

after watering natural maintenance or moisturizing maintenance for 3 days, cutting shrinkage and expansion joints, wherein the width of the shrinkage joints is 1mm, and the depth of the shrinkage joints is 1/2 of the thickness of the cross section; the expansion joint is 3cm, and the depth penetrates through the whole section. And spraying hydrophilic finishing agent on the surface of the poured permeable pavement paving layer for hardening treatment, so that the surface strength and the attractiveness of the permeable pavement paving layer are improved.

Example 3

The difference between this example 3 and example 1 is that: the first layered cement has different specific weight from Portland cement to aluminate cement, and the specific weight is 15%Rising to 20%; the types of the first layered admixture are different from the specific gravity of the total component, mineral powder is changed into silicon powder and gypsum powder, and the specific gravity is increased from 18% to 25%; the types and specific gravities of the first layered aggregate are different from those of the total components, the ceramic sand of 40-120 meshes is changed into quartz sand of 40-120 meshes, and the specific gravity is reduced to 45% from 60%; the specific gravity of the first layered water in the total components is different, and the proportion of the first layered water in the total components is increased from 7% to 10%; the specific gravity of the first layered fiber is reduced from 3% to 1% of the weight of the gel material from polypropylene fiber to polyvinyl alcohol fiber; the first layered foaming agent has different types and specific gravities, and is changed from a composite foaming agent into a composite and animal protein foaming agent, and the specific gravity of the composite and animal protein foaming agent is increased to 0.03% from 0.02% of the weight of the gel material; the first layered foam stabilizer is different in type and specific gravity, is changed from hydroxypropyl methyl cellulose ether to silicone amide, and has the specific gravity which is increased from 0.02 percent to 0.2 percent of the weight of the gel material; the first layered water reducing agent has different types and specific gravities, and is changed from a polycarboxylic acid high-efficiency water reducing agent into a sodium lignosulfonate water reducing agent, and the specific gravity of the sodium lignosulfonate water reducing agent is reduced to 0.3% from 0.8% of the weight of the gel material. The casting thickness of the first layer is different, and is changed from 150mm to 200 mm; the first fraction had a different density of 1300kg/m³It became 1200kg/m³。

The difference between this example 3 and example 2 is that: the type and the specific gravity of the first layered cement are different from those of the total component, the first layered cement is changed from portland cement and aluminate cement into aluminate cement, and the specific gravity is reduced from 30 percent to 20 percent; the types of the first layered admixture are different from the specific gravity of the total component, the fly ash is changed into silicon powder and gypsum powder, and the specific gravity is reduced to 25 percent from 28 percent; the types and specific gravity of the first layered aggregate are different from those of the total composition, the carborundum of 40-120 meshes is changed into quartz sand of 40-120 meshes, and the specific gravity is increased from 30% to 45%; the specific gravity of the first layered water in the total components is different, and the proportion of the first layered water in the total components is reduced from 12% to 10%; the first layered fiber is different in type and specific gravity, polyethylene fiber is changed into polyethanol fiber, and the specific gravity of the first layered fiber is increased to 1% from 0.5% of the weight of the gel material; the first layered foaming agent has different kinds and specific weight, and is prepared from animal protein foaming agent to composite animal protein foaming agent with specific weight of 0.14% or lessReducing to 0.03%; the first layered foam stabilizer has different types and specific gravities, changes methyl cellulose into silicone amide, and reduces the specific gravity of the first layered foam stabilizer from 0.35% to 0.2% of the weight of the gel material; the first layered water reducing agent has different kinds and specific weight, and is changed from naphthalene-based high-efficiency water reducing agent to sodium lignosulfonate water reducing agent, and the specific weight of the first layered water reducing agent is increased from 0.03% to 0.3% of the weight of the gel material. The pouring thicknesses of the first layers are different and are changed from 350mm to 200 mm; the first layers differ in density by 800kg/m³It became 1200kg/m³。

ingredient table 3

First layered cement	Aluminate cement	20％
			First layered admixture	Silica powder and gypsum powder	25％
First layered aggregate	40-120 mesh quartz sand	45％
			First stratified water		10％

The first layering also comprises a polyvinyl alcohol fiber, a composite and animal protein foaming agent, a silicone amide foam stabilizer and a lignosulfonate water reducing agent, wherein the weight of the polyvinyl alcohol fiber is 1% of that of the gel material, the weight of the composite and animal protein foaming agent is 0.03% of that of the gel material, the weight of the silicone amide accounts for 0.2% of that of the gel material, and the weight of the sodium lignosulfonate accounts for 0.3% of that of the gel material.

adding the first layered foaming agent and water into a foaming machine according to the volume ratio of 1:60 to prepare rich and fine foam, wherein the foam density is 0.05g/cm³；

Firstly, weighing first layered cement, a first layered admixture, first layered aggregate and first layered fiber in proportion, adding the materials into a stirrer, carrying out dry stirring for 45s, adding a first layered water reducing agent, a first layered foam stabilizer and 80% of water, stirring for 4min, and stirring into a thick slurry;

then adding the rest 20% of water, stirring for 2min, and stirring into a slurry state, wherein the expansion degree is 220 mm;

and finally, adding the prepared foam into a stirring pot, continuously stirring uniformly to obtain first layered slurry, and pouring the first layered slurry on a plain soil tamped layer or a broken stone cushion layer (or a cement stabilized crushed stone layer) to obtain the permeable pavement paving layer of the embodiment.

Wherein the pouring thickness of the first layered component is 200mm, and the density of the first layered component is 1200kg/m³。

After the pouring is finished, carrying out maintenance and post-treatment:

after watering natural maintenance or moisture-retaining maintenance for 3 days, cutting shrinkage and expansion joints, wherein the width of the shrinkage joints is 3mm, and the depth of the shrinkage joints is 2/5 of the section thickness; the expansion joint is 2cm, and the depth penetrates through the whole section. And spraying hydrophilic finishing agent on the surface of the poured permeable pavement paving layer for hardening treatment, so that the surface strength and the attractiveness of the permeable pavement paving layer are improved.

Example 4

The embodiment provides a permeable pavement paving layer, which only comprises a first layered layer.

The difference between this example 4 and example 1 is that: first layer cement in the assemblyThe specific gravity of the components is different and is increased from 15 percent to 25 percent; the specific gravity of the first layered admixture in the total components is different, and the specific gravity is reduced from 18% to 15%; the types of the first layered aggregate and the specific gravity in the total component are different, the ceramic sand of 40-120 meshes is changed into quartz sand of 40-120 meshes, and the specific gravity in the total component is reduced to 50% from 60%; the specific gravity of the first layered water in the total components is different, and the proportion of the first layered water in the total components is increased from 7% to 9%; the specific gravity of the first layered fiber is reduced from 3 percent of the weight of the gel material to 1 percent; the specific gravity of the first layered foaming agent is different and is increased from 0.02 percent to 0.07 percent of the weight of the gel material; the specific gravity of the first layered foam stabilizer is different, and is increased from 0.02% to 0.2% of the weight of the gel material; the specific gravity of the first layered water reducing agent is different and is reduced to 0.4% from 0.8% of the weight of the gel material. The casting thickness of the first layer is different, and is changed from 150mm to 250 mm; the first fraction had a different density of 1300kg/m³It became 1000kg/m³。

The difference between this example 4 and example 2 is that: the type and the specific gravity of the first layered cement are different from those of the total component, the first layered cement is changed from portland cement and aluminate cement into portland cement, and the specific gravity is reduced from 30 percent to 25 percent; the types of the first layered admixture are different from the specific gravity of the total component, the fly ash is changed into mineral powder, and the specific gravity is reduced to 15% from 28%; the types and specific gravities of the first layered aggregate are different from those of the total components, 40-120 meshes of carborundum are changed into 40-120 meshes of quartz sand, and the specific gravity is increased from 30% to 50%; the specific gravity of the first layered water in the total components is different, and the proportion of the first layered water in the total components is reduced from 12% to 9%; the first layered fiber is different in type and specific gravity, is changed from polyethylene fiber to polyformaldehyde fiber, and the specific gravity of the first layered fiber is increased to 1% from 0.5% of the weight of the gel material; the first layered foaming agent has different types and specific gravities, and is changed from an animal protein foaming agent into a composite foaming agent, and the specific gravity of the composite foaming agent is reduced to 0.07 percent from 0.14 percent of the weight of the gel material; the first layered foam stabilizer has different types and specific gravities, and changes methyl cellulose into hydroxypropyl methyl cellulose ether, and the specific gravity of the first layered foam stabilizer is reduced to 0.2% from 0.35% of the weight of the gel material; the first layered water reducing agent has different kinds and specific gravitiesThe naphthalene-based superplasticizer is changed into a polycarboxylic acid superplasticizer, and the specific gravity of the polycarboxylic acid superplasticizer is increased from 0.03% to 0.4% of the weight of the gel material. The pouring thicknesses of the first layers are different and are changed from 350mm to 250 mm; the first layers differ in density by 800kg/m³It became 1000kg/m³。

The difference between this example 4 and example 3 is that: the type and specific gravity of the first layered cement are different from those of the total components, aluminate cement is changed into portland cement, and the specific gravity is increased from 20% to 25%; the first layered admixture is different in types and specific gravity in the total components, and the silica powder and the gypsum powder are changed into mineral powder, and the specific gravity is reduced to 15% from 25%; the first layered aggregate has different specific gravity in the total components, and the specific gravity is increased from 45% to 50%; the specific gravity of the first layered water in the total components is different, and the proportion of the first layered water in the total components is reduced from 10% to 9%; the first layered fiber is different in type and is changed from the polyethanol fiber into the polyformaldehyde fiber; the first layered foaming agent has different types and specific gravities, is changed from a composite and animal protein foaming agent into a composite foaming agent, and the specific gravity of the composite foaming agent is increased to 0.07 percent from 0.03 percent of the weight of the gel material; the first layered foam stabilizer is prepared from silicone amide into hydroxypropyl methyl cellulose ether according to different types; the first layered water reducing agent has different types and specific gravities, and is changed from a sodium lignosulfonate water reducing agent to a polycarboxylic acid high-efficiency water reducing agent, and the specific gravity of the polycarboxylic acid high-efficiency water reducing agent is increased from 0.3% to 0.4% of the weight of the gel material. The pouring thickness of the first layer is different and is changed from 200mm to 250 mm; the first layers differ in density by 1200kg/m³It became 1000kg/m³。

The components and contents of the first layer of this example 4 are shown in the following table:

ingredient table 4

In this embodiment 4, the first layer further includes polyoxymethylene fibers, a composite foaming agent, a hydroxypropyl methyl cellulose ether foam stabilizer, and a polycarboxylic acid high efficiency water reducing agent, where the polyoxymethylene fibers account for 1% by weight of the gel material, the composite foaming agent accounts for 0.07% by weight of the gel material, the hydroxypropyl methyl cellulose ether accounts for 0.2% by weight of the gel material, and the polycarboxylic acid high efficiency water reducing agent accounts for 0.4% by weight of the gel material.

adding the first layered foaming agent and water into a foaming machine according to the proportion of 1:100 to prepare rich and fine foam with the foam density of 0.02g/cm³；

Firstly, weighing first layered cement, a first layered admixture, first layered aggregate and first layered fiber according to a proportion, adding the materials into a stirrer, carrying out dry stirring for 30s, adding a first layered water reducing agent, a first layered foam stabilizer and 80% of water, stirring for 3min, and stirring into a thick slurry;

then adding the rest 20% of water, stirring for 2min, and stirring to form a slurry state, wherein the expansion degree is 270 mm;

finally, adding the prepared foam into a stirring pot, and continuously stirring for 1min till the foam is uniform, thereby obtaining first layered slurry; and pouring the first layered slurry on the rammed earth layer or the gravel cushion layer (or the cement-stabilized gravel layer) to obtain the permeable pavement paving layer of the embodiment.

Wherein, the first layered casting thickness is 250mm, and the density of the first layer is 1000kg/m³。

After the pouring is finished, carrying out maintenance and post-treatment:

after watering natural maintenance or moisture-retaining maintenance for 3 days, cutting shrinkage and expansion joints, wherein the width of the shrinkage joints is 2mm, and the depth of the shrinkage joints is 2/5 of the section thickness; the expansion joint is 1-3cm deep and penetrates the whole cross section. And spraying hydrophilic finishing agent on the surface of the poured permeable pavement paving layer for hardening treatment, so that the surface strength and the attractiveness of the permeable pavement paving layer are improved.

Example 5

The difference between this example 5 and example 1 is that: the thickness of the first layered casting is different, and is changed from 150mm to 300 mm.

The components and contents of the first layer of this example are shown in the following table:

ingredient table 5

The first layer of this embodiment further includes polypropylene fibers, a composite foaming agent, a hydroxypropyl methylcellulose ether foam stabilizer, and a polycarboxylic acid high efficiency water reducing agent, where the polypropylene fibers account for 3% of the weight of the gel material, the composite foaming agent accounts for 0.02% of the weight of the gel material, the hydroxypropyl methylcellulose ether accounts for 0.02% of the weight of the gel material, and the polycarboxylic acid high efficiency water reducing agent accounts for 0.8% of the weight of the gel material.

the first layered foaming agent is added according to the proportion of 1:20And water, and the mixture is added into a foaming machine to prepare rich and fine foam with the foam density of 0.02g/cm³；

Firstly, weighing and adding first layered cement, a first layered admixture, first layered aggregate and first layered fiber into a stirrer according to a proportion, and carrying out dry stirring for 30 s; adding a first layered water reducing agent, a first layered foam stabilizer and 80% of water, stirring for 3min, and stirring into a thick slurry;

finally, adding the prepared foam into a stirring pot, and continuously stirring uniformly to obtain first layered slurry; and pouring the first layered slurry on the rammed earth layer or the gravel cushion layer (or the cement-stabilized gravel layer) to obtain the permeable pavement paving layer of the embodiment.

Wherein: the first layered casting thickness is 300mm, and the density of the first layered casting is 1300kg/m³。

After the pouring is finished, carrying out maintenance and post-treatment:

Example 6

The embodiment provides a permeable pavement paving layer, which comprises a first layered layer and a second layered layer. Referring to fig. 2, fig. 2 is a structural layer of the permeable pavement paving layer of example 6, wherein 2 is a first layer and 3 is a second layer.

The permeable pavement layer in the embodiment 6 comprises a second layered layer. Wherein the second layer 3 is poured on a rammed earth layer or a gravel cushion layer (or a cement-stabilized gravel layer), and the first layer 2 is poured on the second layer 3. The casting thickness of the second sub-layer 3 is 300mm, and the density of the second sub-layer 3 is 700kg/m³。

In this embodiment, the components and contents of the first layer 2 and the second layer 3 are shown in the following table:

ingredient table 6

First layered cement	Portland cement	20％
			First layered admixture	Silica powder and gypsum powder	25％
First layered aggregate	40-120 mesh quartz sand	45％
			First stratified water		10％
Second stratified cement	Portland cement	15％
			Second layered admixture	Silica powder and gypsum	35％
Second layered aggregate	40-120 mesh quartz sand	40％
			Second stratified water		10％

The first layered structure also comprises a polyvinyl alcohol fiber, a composite and animal protein foaming agent, a silicone amide foam stabilizer and a lignosulfonate water reducing agent, wherein the weight of the polyvinyl alcohol fiber is 1% of that of the first layered gel material, the weight of the composite and animal protein foaming agent is 0.03% of that of the first layered gel material, the weight of the silicone amide is 0.2% of that of the first layered gel material, and the weight of the sodium lignosulfonate is 0.3% of that of the first layered gel material.

The second layered structure also comprises a polyvinyl alcohol fiber, a composite foaming agent, a silicone amide foam stabilizer and a lignosulfonate water reducing agent, wherein the weight of the polyvinyl alcohol fiber is 1% of that of the second layered gel material, the weight of the composite foaming agent is 0.16% of that of the second layered gel material, the weight of the silicone amide is 0.2% of that of the second layered gel material, and the weight of the sodium lignosulfonate is 0.3% of that of the second layered gel material.

firstly, casting a second layering:

adding the second layered foaming agent and water into a foaming machine according to the volume ratio of 1:60 to prepare rich and fine foam, wherein the foam density is 0.05g/cm³；

Firstly, weighing and adding second layered cement, a second layered admixture, second layered aggregate and second layered fiber into a stirrer in proportion, and performing dry stirring for 45 s; adding a second layered water reducing agent, a second layered foam stabilizer and 80% of water, stirring for 4min, and stirring into a thick slurry;

then adding the rest 20% of water, stirring for 2min, and stirring into a slurry state, wherein the expansion degree is 250 mm;

finally, adding the prepared foam into a stirring pot, and continuously stirring uniformly to obtain second layered slurry; and pouring the second layered slurry on a rammed earth layer or a gravel cushion layer (or a cement-stabilized gravel layer) to obtain a second layered layer.

Wherein: the second layered casting thickness is 300mm, and the second layered density is 700kg/m³。

Secondly, casting a first layer:

adding the first layered foaming agent and water into a foaming machine according to the ratio of 1:60 to prepare rich and fine foam with the foam density of 0.05g/cm³；

Firstly, weighing and adding first layered cement, a first layered admixture, first layered aggregate and first layered fiber into a stirrer in proportion, and carrying out dry stirring for 45 s; adding a first layered water reducing agent, a first layered foam stabilizer and 80% of water, stirring for 4min, and stirring into a thick slurry;

then stirring the rest 20% of water for 2min, and stirring into a slurry with an expansion degree of 220 mm;

and finally, adding the prepared foam into a stirring pot, and continuously stirring uniformly to obtain the first layered slurry. And pouring the first layered slurry above the second layered to obtain the permeable pavement paving layer of the embodiment.

Wherein the first layered casting thickness is 50mm, and the first layered density is 1200kg/m³。

After the pouring is finished, carrying out maintenance and post-treatment:

after watering natural maintenance or moisture-retaining maintenance for 3 days, cutting shrinkage and expansion joints, wherein the width of the shrinkage joint is 4mm, and the depth is 2/3 of the section thickness; the expansion joint is 2cm, and the depth penetrates through the whole section. And spraying hydrophilic finishing agent on the surface of the poured permeable pavement paving layer for hardening treatment, so that the surface strength and the attractiveness of the permeable pavement paving layer are improved.

Example 7

This example 7 provides a permeable pavement paving layer, including first layering, second layering and third layering. Referring to fig. 3, fig. 3 shows a structure layer of the permeable pavement paving layer of example 7, wherein 4 is a first layer, 5 is a second layer, and 6 is a third layer.

In this embodiment 7, the third sub-layer 6 of the permeable pavement paving layer is poured with a rammed earth layer or a gravel cushion layer (or cement)Stabilized gravel layer), the second layer 5 is cast over the third layer 6, and the first layer 4 is cast over the second layer 5. The pouring thickness of the third layer 6 is 200mm, and the density of the third layer 6 is 500kg/m³。

The components and contents of the first layer 4, the second layer 5 and the third layer 6 in this example are shown in the following table:

ingredient table 7

First layered cement	Portland cement	20％
			First layered admixture	Silica powder and gypsum powder	25％
First layered aggregate	40-120 mesh quartz sand	45％
			First layered fiber	Polyvinyl alcohol fiber	10％
Second stratified cement	Portland cement	15％
			Second layered admixture	Silica powder and gypsum	35％
Second layered aggregate	40-120 mesh quartz sand	40％
			Second stratified water		10％
Third layer cement	Sulphoaluminate cement	20％
			Third layered admixture	Silica powder and gypsum powder	30％
Third layered aggregate	40-120 mesh quartz sand	40％
			Third stratified water		10％

The third layered product also comprises a polyvinyl alcohol fiber, an animal protein foaming agent, a silicone amide foam stabilizer and a lignosulfonate water reducing agent, wherein the polyvinyl alcohol fiber accounts for 1% of the weight of the third layered gel material, the animal protein foaming agent accounts for 0.25% of the weight of the third layered gel material, the silicone amide accounts for 0.2% of the weight of the third layered gel material, and the sodium lignosulfonate accounts for 0.3% of the weight of the third layered gel material.

firstly, pouring a third layering;

adding the third layered foaming agent and water into a foaming machine according to the volume ratio of 1:60 to prepare rich and fine foam, wherein the foam density is 0.05g/cm³；

Firstly, weighing the third-layer cement, the third-layer admixture, the third-layer aggregate and the third-layer fiber in proportion, adding into a stirrer, and carrying out dry stirring for 45 s; adding the third-layer water reducing agent, the third-layer foam stabilizer and 80% of water, stirring for 4min, and stirring into a thick slurry;

then adding the rest 20% of water, stirring for 2min, and stirring into a slurry with an expansion degree of 260 mm;

finally, adding the prepared foam into a stirring pot, and continuously stirring uniformly to obtain third layered slurry; and pouring the third layered slurry on a rammed earth layer or a gravel cushion layer (or a cement-stabilized gravel layer) to form a third layer.

Wherein the third layered casting thickness is 200mm, and the density of the third layered casting is 500kg/m³。

Secondly, casting a second layered structure:

mixing the second mixture according to the volume ratio of 1:60Adding the layered foaming agent and water into a foaming machine to prepare rich and fine foam with the foam density of 0.05g/cm³；

adding the rest 20% of water, stirring for 2min, and stirring into slurry with an expansion degree of 250 mm;

finally, adding the prepared foam into a stirring pot, and continuously mixing and stirring for 2min till the foam is uniform, thereby obtaining second layered slurry; and pouring the second layered slurry on the third layered layer to form a second layered layer.

Wherein: the second layered casting thickness is 200mm, and the density of the second layered casting is 700kg/m³。

Thirdly, casting a first layer:

Firstly, weighing and adding first layered cement, a first layered admixture, first layered aggregate and first layered fiber into a stirrer according to a proportion, and carrying out dry stirring for 60 s; adding a first layered water reducing agent, a first layered foam stabilizer and 80% of water, stirring for 5min, and stirring into a thick slurry;

then adding the rest 20% of water, stirring for 2min to form a slurry state, wherein the expansion degree is 220 mm;

finally, adding the prepared foam into a stirring pot, and continuously mixing and stirring for 2min till the foam is uniform, thereby obtaining first layered slurry; and pouring the first layered slurry on the second layered layer to obtain the permeable pavement paving layer of the embodiment.

Wherein the first layered casting thickness is 50mm, and the density of the first layered casting is 1200kg/m³。

After the pouring is finished, carrying out maintenance and post-treatment:

Comparative example 1

The present comparative example provides a permeable pavement paving comprising only a first layer.

The first layer is conventional foam concrete on the market.

Comparative example 2

The first layer is conventional light ceramsite concrete on the market.

Comparative example 3

In this comparative example, a permeable pavement layer is provided that includes only a first layer and a second layer, and the density of the first layer is less than the density of the second layer. Comparative example 3 and example 6 differ in that the first layer density is the second layer density in the examples and the second layer density is the first layer density in the examples.

Comparative example 3 ingredient table

First layered cement	Portland cement	15％
			First layered admixture	Silica powder and gypsum	35％
First layered aggregate	40-120 mesh carborundum	40％
			First stratified water		10％
Second stratified cement	Portland cement	20％
			Second layered admixture	Silica powder and gypsum	25％
Second layered aggregate	40-120 mesh quartz sand	45％
			Second stratified water		10％

The first layered structure also comprises a polyvinyl alcohol fiber, a composite foaming agent, a silicone amide foam stabilizer and a lignosulfonate water reducing agent, wherein the weight of the polyvinyl alcohol fiber is 1% of that of the second layered gel material, the weight of the composite foaming agent is 0.16% of that of the second layered gel material, the weight of the silicone amide is 0.2% of that of the second layered gel material, and the weight of the sodium lignosulfonate is 0.3% of that of the second layered gel material.

The second layered structure also comprises a polyvinyl alcohol fiber, a composite and animal protein foaming agent, a silicone amide foam stabilizer and a lignosulfonate water reducing agent, wherein the weight of the polyvinyl alcohol fiber is 1% of that of the first layered gel material, the weight of the composite and animal protein foaming agent is 0.03% of that of the first layered gel material, the weight of the silicone amide is 0.2% of that of the first layered gel material, and the weight of the sodium lignosulfonate is 0.3% of that of the first layered gel material.

The preparation method of the permeable pavement paving layer of the comparative example comprises the following steps:

firstly, casting a second layering:

Weighing the second layered cement, the second layered admixture, the second layered aggregate and the second layered fiber according to a ratio, adding into a stirrer, stirring for 45s, adding the second layered water reducer and 80% of water, stirring for 4min, and stirring into a slurry shape with the expansion degree of 250 mm;

adding the second layered foam stabilizer, stirring for 1min, adding the rest 20% of water, and stirring for 2 min;

adding the prepared foam into a stirring pot, and continuously stirring uniformly to obtain second layered slurry; and pouring the second layered slurry on a rammed earth layer or a gravel cushion layer (or a cement-stabilized gravel layer) to obtain a second layered layer.

Wherein the second layered casting thickness is 300mm, and the second layered density is 1200kg/m³。

Secondly, casting a first layer:

adding the first layered foaming agent and water into a foaming machine according to the volume ratio of 1:30 to prepare rich and fine foam, wherein the foam density is 0.02g/cm³；

Weighing the first layered cement, the first layered admixture, the first layered aggregate and the first layered fiber according to a proportion, adding into a stirrer, stirring for 30s, adding the first layered water reducer and 80% of water, stirring for 3min, and stirring into a slurry shape with the expansion degree of 220 mm;

adding the first layered foam stabilizer, stirring for 1min, adding the rest 20% of water, and stirring for 2 min;

adding the prepared foam into a stirring pot, and continuously stirring uniformly to obtain the first layering layer. And (3) pouring a rammed earth layer or a broken stone cushion layer (or a cement-stabilized broken stone layer) on the first layered concrete layer to obtain the permeable pavement paving layer of the comparative example.

Wherein: the first layered casting thickness is 50mm, and the density of the first layered casting is 700kg/m³。

After the pouring is finished, carrying out maintenance and post-treatment:

Comparative example 4

The comparison example provides a permeable pavement paving layer, which comprises a first layer, a second layer and a third layer.

The density of the third segment in this comparative example is greater than the density of the second segment and greater than the density of the first segment. Comparative example 4 and example 7 differ in that the first density of stratification is the second density of stratification in the example, the second density of stratification is the third density of stratification in the example, and the third density of stratification is the first density of stratification in the example.

The components and contents of the first, second and third layers are shown in the following table:

comparative example 4 ingredient table

The second sub-layer also comprises a polyvinyl alcohol fiber, an animal protein foaming agent, a silicone amide foam stabilizer and a lignosulfonate water reducing agent, wherein the polyvinyl alcohol fiber accounts for 1% of the weight of the third layered gel material, the animal protein foaming agent accounts for 0.25% of the weight of the third layered gel material, the silicone amide accounts for 0.2% of the weight of the third layered gel material, and the sodium lignosulfonate accounts for 0.3% of the weight of the third layered gel material.

The third layered structure also comprises a polyvinyl alcohol fiber, a composite and animal protein foaming agent, a silicone amide foam stabilizer and a lignosulfonate water reducing agent, wherein the weight of the polyvinyl alcohol fiber is 1% of that of the first layered gel material, the weight of the composite and animal protein foaming agent is 0.03% of that of the first layered gel material, the weight of the silicone amide is 0.2% of that of the first layered gel material, and the weight of the sodium lignosulfonate is 0.3% of that of the first layered gel material.

firstly, pouring a third layering:

Weighing the third-layer cement, the third-layer admixture, the third-layer aggregate and the third-layer fiber according to a proportion, adding into a stirrer, stirring for 45s in a dry mode, adding a third-layer water reducing agent and 80% of water, stirring for 4min, and stirring into a slurry shape, wherein the expansion degree is 250 mm;

adding the third layered foam stabilizer, stirring for 1min, adding the rest 20% of water, and stirring for 2 min;

adding the prepared foam into a stirring pot, and continuously stirring uniformly to obtain third layered slurry; and pouring the slurry of the third layer on a rammed earth layer or a gravel cushion layer (or a cement-stabilized gravel layer) to obtain the third layer.

Wherein: the third layer has a casting thickness of 200mm and a density of 1200kg/m³。

Secondly, casting a second layered structure:

adding the prepared foam into a stirring pot, and continuously stirring uniformly to obtain second layered slurry; and pouring the second layered slurry on the third layer to obtain a second layer.

Wherein: the second layered casting thickness is 200mm, and the second layered density is 500kg/m³。

Thirdly, casting a first layer:

Weighing the first layered cement, the first layered admixture, the first layered aggregate and the first layered fiber according to a proportion, adding into a stirrer, stirring for 60s, adding the first layered water reducer and 80% of water, stirring for 5min, and stirring into a slurry shape with the expansion degree of 220 mm;

adding the prepared foam into a stirring pot, and continuously stirring uniformly to obtain the first layering layer. The second layer is poured above the plain soil compacted layer or the broken stone cushion layer, and the first layer is poured on the second layer, so that the permeable pavement paving layer of the comparative example is obtained.

Wherein the first layered casting thickness is 50mm, and the first layered density is 700kg/m³。

After the pouring is finished, carrying out maintenance and post-treatment:

Comparative example 5

In this comparative example the density of the third segment is greater than the density of the second segment, which is greater than the density of the first segment. Comparative example 5 and example 7 are different in that the first density of stratification is the third density of stratification in example, and the third density of stratification is the first density of stratification in example.

comparative example 5 ingredient table

The first layering also comprises a polyvinyl alcohol fiber, an animal protein foaming agent, a silicone amide foam stabilizer and a lignosulfonate water reducing agent, wherein the weight of the polyvinyl alcohol fiber is 1% of that of the third layering gel material, the weight of the animal protein foaming agent is 0.25% of that of the third layering gel material, the weight of the silicone amide is 0.2% of that of the third layering gel material, and the weight of the sodium lignosulfonate is 0.3% of that of the third layering gel material.

firstly, pouring a third layering:

adding the third layered foaming agent and water into a foaming machine according to the volume ratio of 1:60 to prepare rich and fine foam, wherein the foam density is 0.05g/cm³. And weighing the third-layer cement, the third-layer admixture, the third-layer aggregate and the third-layer fiber according to the proportion, adding into a stirrer, stirring for 45s in a dry mode, adding the third-layer water reducer and 80% of water, stirring for 4min, and stirring into a slurry shape, wherein the expansion degree is 220 mm. Adding the third layer foam stabilizer, stirring for 1min, adding the rest 20% water, and stirring for 2 min. Adding the prepared foam into a stirring pot, and continuously stirring uniformly to obtain third layered slurry. And pouring the third layered slurry on a rammed earth layer or a gravel cushion layer (or a cement-stabilized gravel layer) to form a third layer.

Secondly, casting a second layered structure:

adding the second layered foaming agent and water into a foaming machine according to the volume ratio of 1:60 to prepare rich and fine foam, wherein the foam density is 0.05g/cm³. And weighing the second layered cement, the second layered admixture, the second layered aggregate and the second layered fiber according to the proportion, adding into a stirrer, stirring for 45s in a dry mode, adding a second layered water reducing agent and 80% of water, stirring for 4min, and stirring into a slurry shape, wherein the expansion degree is 250 mm. After the second layered foam stabilizer is added,after stirring for 1min, the remaining 20% water was added and stirred for 2 min. And adding the prepared foam into a stirring pot, and continuously stirring uniformly to obtain second layered slurry. And pouring the second layered slurry on the third layered layer to form a second layered layer.

Wherein: the second layered casting thickness is 200mm, and the second layered density is 700kg/m³。

Thirdly, casting a first layer:

adding the first layered foaming agent and water into a foaming machine according to the ratio of 1:100 to prepare rich and fine foam with the foam density of 0.08g/cm³. Weighing the first layered cement, the first layered admixture, the first layered aggregate and the first layered fiber according to a proportion, adding into a stirrer, stirring for 60s, adding the first layered water reducer and 80% of water, stirring for 5min, and stirring into a slurry shape with the expansion degree of 260 mm. Adding the first layered foam stabilizer, stirring for 1min, adding the rest 20% water, and stirring for 2 min. And adding the prepared foam into a stirring pot, and continuously stirring uniformly to obtain the first layered slurry. And pouring the first layered slurry on the second layered layer to form a first layered layer, thus obtaining the permeable pavement paving layer of the comparative example.

Wherein: the first layered casting thickness is 50mm, and the first layered density is 500kg/m³。

After the pouring is finished, carrying out maintenance and post-treatment:

after watering natural maintenance or moisture-keeping maintenance for 3 days, cutting shrinkage and expansion joints, wherein the width of the shrinkage joint is 1-5mm, and the depth is not less than 1/3 of the section thickness; the expansion joint is 1-3cm deep and penetrates the whole cross section. And spraying hydrophilic finishing agent on the surface of the poured permeable pavement paving layer for hardening treatment, so that the surface strength and the attractiveness of the permeable pavement paving layer are improved.

The test method comprises the following steps:

the following experiments were conducted on the permeable pavement materials prepared in examples 1 to 5 and comparative examples 1 to 2.

(1) Carrying out compression test, dry apparent density test and dry shrinkage value test on the pavement layer material according to JC/T1062 and 2007 foam concrete block;

(2) the water permeability coefficient determination method is used for determining the water permeability, and the water permeability coefficient is determined according to GB/T25993-;

(3) the bending resistance test is carried out according to GB/T50081-2019 concrete physical and mechanical property test method Standard, and the obtained data are summarized as the following table 1.

(4) The permeable pavement layers prepared in examples 1, 6 to 7 and comparative examples 3 to 5 were maintained for 28 days and then subjected to a vehicle test. The car was about 2 tons, maintaining a speed of 10km/h through the test section. After the car passed through the test section, the road surface condition of the test section of each water permeable pavement layer was observed and recorded in table 2.

And (3) testing results:

TABLE 1 test data sheet

TABLE 2 test data sheet

And (4) conclusion:

the test results of the examples 1 to 5 in table 1 show that the permeable pavement layer of the present invention has good flexural strength and compressive strength, and meets the bearing requirements of the pavement; the water permeability coefficients are all larger than 0.12mm/s and higher than the standard 0.1mm/s, and the requirements of water permeable pavement of the pavement can be met; the drying shrinkage values are all less than 0.42mm/m, and the requirements of the standard of less than or equal to 0.9mm/m are met.

In table 1, as can be seen from the comparison between the test results of the example 2 and the conventional foam concrete of the comparative example 1 and the test results of the conventional lightweight ceramsite concrete of the comparative example 2, under the condition of the same density, the permeable pavement layer of the present invention has more excellent flexural strength, compressive strength, water permeability and smaller dry shrinkage value compared with other materials under the condition of the same volume weight.

The results of the test section vehicle-passing test in table 2 show that: the embodiment 1, the embodiment 6 and the embodiment 7 can meet the requirement of passing the vehicle (light load type), and the comprehensive performance is good; the road surfaces of comparative examples 3, 4 and 5 were cracked or broken, and could not satisfy the passing requirements.

Those skilled in the art will appreciate that the figures are merely schematic representations of one preferred implementation scenario and that the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.

Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.

The above-mentioned invention numbers are merely for description and do not represent the merits of the implementation scenarios.

The above disclosure is only a few specific implementation scenarios of the present invention, however, the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.

Claims

1. The utility model provides a permeable pavement layer, its characterized in that, permeable pavement layer includes first layering, first layering is laid in native rammed mass layer or rubble bed course top, first layering includes following component according to weight ratio:

2. The permeable pavement paving layer of claim 1, further comprising a second layer disposed between the first layer and the rammed earth layer or gravel layer, wherein the second layer comprises the following components in weight percent:

3. The permeable pavement paving layer of claim 2, further comprising a third layer, wherein the third layer is laid between the second layer and the soil compacting layer or the gravel cushion layer, and comprises the following components in parts by weight:

4. The permeable pavement paving according to claim 2, wherein when the permeable pavement paving is composed of the first and second sublayers, the first sublayer material density is greater than the second sublayer material density.

5. The permeable pavement paving according to claim 3, wherein when the permeable pavement paving is composed of the first, second and third segments, the first segment has a material density greater than the second segment, and the second segment has a material density greater than the third segment.

6. The permeable pavement paving layer as recited in claim 1, wherein the first layer has a thickness of 150-400mm and a density of 800-1300kg/m³The density of the first layer is preferably 1000-³。

7. The permeable pavement paving layer as recited in claim 2, wherein the first layer has a thickness of 50-350mm and a density of 800-³The thickness of the second layer is 100-300mm, and the density is 400-900kg/m³The density of the first layer is preferably 1000-³The density of the second layer is preferably 800-900kg/m³。

8. The permeable pavement paving layer as recited in claim 3, wherein the first layer has a thickness of 50-150mm and a density of 800-³Said secondThe thickness of the layers is 50-200mm, and the density is 500-900kg/m³The thickness of the third layer is 50-350mm, and the density is 300-^3，The density of the first layer is preferably 1000-³The density of the second layer is preferably 500-900kg/m³The density of the third layer is preferably 500-600kg/m³。

9. The permeable pavement according to any one of claims 1 to 3, characterized in that,

the cement of the first layer, the second layer or the third layer is at least one of ordinary portland cement, aluminate cement, sulphoaluminate cement and phosphate cement;

the admixture of the first layer, the second layer or the third layer is mineral powder, fly ash, silicon powder and CaSO₄At least one of a powder and a volume stabilizer;

the aggregate of the first layer, the second layer or the third layer is at least one of quartz sand, carborundum or pottery sand of 20-120 meshes;

the fibers of the first layer, the second layer or the third layer are all selected from at least one of polypropylene fibers, polyvinyl alcohol fibers, polyethylene fibers, polyvinyl alcohol fibers, polyformaldehyde fibers, glass fibers, graphene fibers and carbon fibers, and the fiber length of the fibers is 1.5-30 mm;

the foaming agent of the first layer, the second layer or the third layer is selected from a composite or animal protein foaming agent;

the foam stabilizer for the first layer, the second layer or the third layer is at least one selected from hydroxypropyl methyl cellulose ether, methyl cellulose or silicone amide;

the water reducing agent of the first layer, the second layer or the third layer is selected from one of polycarboxylic acid high-efficiency water reducing agent, sodium lignosulfonate or naphthalene high-efficiency water reducing agent and the like.

10. The method for preparing a water permeable pavement paving layer according to claim 1, comprising the steps of:

s1: adding the first layered foaming agent and water into a foaming machine according to a proportion to prepare foam; weighing the first-layered cement, the admixture, the aggregate and the fiber in proportion, adding into a stirrer, performing dry stirring, adding the first-layered water reducing agent, the foam stabilizer and the water, and stirring; adding the prepared foam into a stirring pot according to a certain amount, and continuously stirring uniformly to obtain a first layering layer.

11. The method for producing a water permeable pavement paving layer according to claim 10, comprising the steps of:

s01: adding the second layered foaming agent and water into a foaming machine according to a proportion to prepare rich and fine foam; weighing the cement, the admixture, the aggregate and the fiber in the second layer according to the proportion, adding the mixture into a stirrer for dry stirring, and then adding the water reducing agent, the foam stabilizer and the water in the second layer for stirring; adding the prepared foam into a stirring pot according to a certain amount, and continuously stirring uniformly to obtain a second layered product; the first sub-layer is poured above the second sub-layer in a layered mode, and one side, away from the rammed earth layer or the broken stone cushion layer, of the first sub-layer is far away from the rammed earth layer or the broken stone cushion layer;

s01 is a step performed before S1.

12. The method for producing a water permeable pavement paving layer according to claim 11, comprising the steps of:

s001: adding the third layered foaming agent and water into a foaming machine according to a proportion to prepare rich and fine foam; weighing the cement, the admixture, the aggregate and the fiber in the third layer according to the proportion, adding the mixture into a stirrer for dry stirring, and then adding the water reducing agent, the foam stabilizer and the water in the third layer for stirring; adding the prepared foam into a stirring pot according to a certain amount, and continuously stirring uniformly to obtain a third layering layer; pouring the third layer on the rammed earth layer or the broken stone cushion layer, pouring the second layer on the third layer, and pouring the first layer on the second layer;

s001 is a step performed before S01.

13. The method for producing a water-permeable pavement paving according to any one of claims 10 to 12,

the use ratio of the foaming agent to water in the first layer, the second layer and the third layer is 1:20-1: 100;

the foam density is 0.02-0.08g/cm³；

The dry stirring time is 30-60 s;

and (3) adding one of the first layering water reducing agent, the second layering water reducing agent or the third layering water reducing agent, the foam stabilizer and the mixing water which are layered in the same way, and then carrying out secondary wet stirring: firstly, adding a water reducing agent, a foam stabilizer and 80-90% of water, stirring for 3-5min, and stirring into a thick slurry; then adding the rest 10-20% of water, stirring for 1-3min, and stirring the slurry to form a slurry state with the expansion degree of 160-300 mm.

14. The method for producing a water permeable pavement paving according to any one of claims 10 to 12, comprising the steps of:

s2: after watering natural maintenance or moisture-keeping maintenance for 1-7 days, cutting shrinkage and expansion joints, wherein the width of the shrinkage joint is 1-5mm, and the depth is more than or equal to 1/3 of the thickness of the section; the expansion joint is 1-3cm deep and penetrates the whole cross section. And spraying a hydrophilic finishing agent on the surface of the poured permeable pavement paving layer, namely the first layer or the second layer, to perform hardening treatment, so that the surface strength and the attractiveness of the permeable pavement paving layer are improved.

15. The method for preparing a permeable pavement paving layer according to claim 10, wherein the first layered casting thickness is 150-400 mm.

16. The method for preparing a permeable pavement paving layer according to claim 11, wherein the first layered casting thickness is 50-350mm, and the second layered casting thickness is 100-300 mm.

17. The method for preparing a water permeable pavement paving layer according to claim 12, wherein the first layer casting thickness is 50-150mm, the second layer casting thickness is 50-200mm, and the third layer casting thickness is 50-350 mm.