CN109734399B - Method for laying composite impermeable layer - Google Patents
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Abstract
The invention provides a laying method of a composite impermeable layer, which comprises the following steps: paving a gel material A on a target site to form a bottom layer, and carrying out first moisture maintenance on the bottom layer; paving a gel material B on the bottom layer to form an intermediate layer, and carrying out secondary moisture curing on the intermediate layer; paving a gel material A on the intermediate layer to form a surface layer; and carrying out integral maintenance. The permeability coefficient of the composite impermeable layer formed by the laying method is less than 10‑7cm/s, compressive strength>20MPa, and does not cause the pH value of the water body to be higher than 8 after being soaked in water for a long time.
Description
Technical Field
The invention belongs to the field of engineering construction, and particularly relates to a method for paving a composite impermeable layer.
Background
The current impermeable materials for reservoir/river, especially solid waste landfill underlayment are mainly geotextile, clay, bentonite, asphalt, concrete, industrial plastics, etc. which are suitable for different waterproof conditions. Usually, a bottom lining laid on an anti-seepage site is formed into a continuous liquid water-resisting layer for resisting water and the like by adopting a certain construction process (such as leveling a substrate, laying a cushion layer, splicing or welding, compacting, rolling, mixing, maintaining and the like) according to a certain technical standard, so that the aim of preventing water and other liquids from penetrating and permeating is fulfilled.
With the rapid development of industrial production and construction, a large amount of industrial solid wastes such as fly ash and desulfurized gypsum discharged from thermal power plants, various waste residues discharged from metallurgical industry (including blast furnace slag and steel slag, high-temperature furnace lining rock wool and the like) and metal ore dressing tailing sand and the like are generated. These industrial solids waste take up a large amount of land and cause great harm to the environment, such as dust pollution, leaching and infiltration may pollute underground water and surface water. Therefore, the industrial solid wastes are fully utilized, the wastes are changed into valuables, the recycling value is realized, the environmental hazard is reduced, and the urgent and great trend is realized.
Based on the industrial solid waste recycling and environmental benefit consideration, the industrial solid waste is applied to reservoirs or riverways, particularly the impermeable material of the solid waste landfill substrate is a two-purpose technology, and has wide prospect and application prospect. Has double benefits of environment and material recycling.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, a method for laying a composite impermeable layer is provided. Specifically, the technical scheme of the invention is as follows:
a laying method of a composite impermeable layer comprises the following steps: paving a gel material A on a target site to form a bottom layer, and carrying out first moisture maintenance on the bottom layer; paving a gel material B on the bottom layer to form an intermediate layer, and carrying out secondary moisture curing on the intermediate layer; paving a gel material A on the intermediate layer to form a surface layer; and carrying out integral maintenance.
The technical scheme of the invention has the following beneficial effects:
the composite gel impermeable material is prepared by taking the industrial solid waste as a raw material, so that the industrial solid waste can be effectively and fully utilized in a large amount, the reutilization of the industrial solid waste is realized, and the environmental hazard is greatly relieved. Industrial solid wastes are used as raw materials, so that the environmental protection requirement is met, energy conservation and emission reduction can be realized, the replacement of the anti-seepage material is promoted, and the material cost is reduced.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. Technical terms involved in the present invention have meanings commonly understood in the art unless otherwise specified.
Aiming at the problem that the industrial solid wastes such as fly ash, desulfurized gypsum, metallurgical blast furnace slag, high-temperature furnace lining waste rock wool, mineral dressing tailings and the like in China greatly exceed the environmental capacity, the inventor of the invention provides a method for producing the composite gel impermeable material by taking the industrial solid wastes as raw materials, thereby fully realizing the reutilization of the industrial solid wastes and reducing the environmental hazard.
In a first aspect, the present invention provides a composite gel barrier material. The composite gel impermeable material consists of a gel material A and a gel material B; wherein:
the gel material A comprises the following components in parts by weight: 70-95 parts of fly ash, 5-15 parts of lime, 1-5 parts of desulfurized gypsum and one selected from 4-30 parts of blast furnace granulated slag, 4-30 parts of steel slag, 4-30 parts of mineral dressing tailings or 15-30 parts of stone powder with the grain size of 1-3 mm;
the gel material B comprises the following components in parts by weight: 70-95 parts of fly ash, 5-15 parts of lime, 1-5 parts of desulfurized gypsum and 1-10 parts of rock wool or industrial rock wool.
In a preferred embodiment, the gel material a comprises the following components in parts by weight:
70-80 parts of fly ash, 5-8 parts of lime, 2-5 parts of desulfurized gypsum and 15-20 parts of blast furnace granulated slag;
or 70-80 parts of fly ash, 5-8 parts of lime, 2-5 parts of desulfurized gypsum and 15-20 parts of steel slag;
or 80-90 parts of fly ash, 5-8 parts of lime, 1-2 parts of desulfurized gypsum and 4-14 parts of mineral dressing tailings;
or 75-85 parts of fly ash, 8-10 parts of lime, 2-5 parts of desulfurized gypsum and 15-20 parts of stone powder with the grain size of 1-3 mm.
In another preferred embodiment, the gel material B comprises the following components in parts by weight: 80-95 parts of fly ash, 10-15 parts of lime, 2-5 parts of desulfurized gypsum and 5-10 parts of rock wool or industrial rock wool.
The fly ash is fine ash collected from flue gas generated after coal combustion, is main solid waste discharged from a coal-fired power plant, and mainly comprises the following chemical components: SiO 22、Al2O3、FeO、Fe2O3、CaO、TiO2Etc.; the main mineral phase is the glass phase. In the present invention, dry fly ash that is not affected by water or moisture factors can be used in the present invention.
Lime is an air-hardening inorganic gelling material with calcium oxide as a main component. In the present invention, dry lime that is not affected by water or moisture can be used in the present invention.
The desulfurized gypsum is also called flue gas desulfurization gypsum, sulfur gypsum or FGD gypsum, and has the same main component as natural gypsum, namely calcium sulfate dihydrate CaSO4·2H2O, the content is more than or equal to 93 percent.
The granulated blast furnace slag is a solid waste formed by gangue in ores, ash in fuel and non-volatile components in solvent (generally limestone) in the blast furnace iron-making process, mainly contains oxides and a small amount of sulfides of calcium, silicon, aluminum, magnesium and iron, and a main mineral phase is also a glass phase.
Steel slag is a by-product in the steel-making process, and is composed of various oxides formed by oxidizing impurities in pig iron, such as silicon, manganese, phosphorus, sulfur, etc., in the smelting process, and salts generated by the reaction of the oxides and a solvent. The steel slag comprises, for example, 2-8% of metallic iron, 40-60% of calcium oxide, 3-10% of magnesium oxide, 1-8% of manganese oxide, and a large amount of mineral phases which are also glass phases.
The mineral dressing tailings refer to wastes discharged after mineral dressing plants grind ores under specific economic and technical conditions and select useful components.
The rock wool is waste rock wool of a high-temperature furnace lining. Rock wool is an indispensable material for the composite gel impermeable material, and is a key material for ensuring that the impermeable material has the advantages of settlement deformation resistance, frost heaving cracking prevention and freeze thawing resistance.
When the composite gel impermeable material is used, water is adopted for mixing, the pH value is greater than 10, gelation and solidification are started along with time, and certain strength can be obtained after solidification for 24-48 hours. Specifically, uniformly mixing the components of the gel material A to obtain a mixture A, and then mixing the mixture A with water according to a liquid-solid ratio of 10:1 to 0.4: 1; similarly, the components of the gel material B are uniformly mixed to obtain a mixture B, and then the mixture B is mixed by using water according to the liquid-solid ratio of 10:1 to 0.4: 1.
The water consumption is adjusted according to the use purpose and the use environment. When the construction condition needs to adopt slurry for paving, the liquid-solid ratio is controlled to be between 10:1 and 1: 1; when the construction condition needs to adopt the semi-dry material for laying, the liquid-solid ratio is controlled between 1:1 and 0.4:1, and measures such as rolling, compaction and the like are adopted to ensure that the material particles can be fully contacted with each other.
In a second aspect, the invention provides a composite impermeable layer, which is made of the composite gel impermeable material, and comprises a bottom layer, a middle layer and a surface layer which are sequentially laid; the bottom layer and the surface layer are respectively made of gel materials A, and the middle layer is made of gel materials B.
The thicknesses of the bottom layer and the surface layer can be the same or different, and the thickness ranges from 10 cm to 50 cm; the thickness of the intermediate layer is in the range of 20-50 cm; and the thickness of the middle layer is not greater than the thickness of the bottom layer.
In a third aspect, the invention provides a method for laying a composite impermeable layer, which comprises the following steps:
paving a gel material A on a target site to form a bottom layer, and carrying out first moisture maintenance on the bottom layer;
paving a gel material B on the bottom layer to form an intermediate layer, and carrying out secondary moisture curing on the intermediate layer;
paving a gel material A on the intermediate layer to form a surface layer;
and carrying out integral maintenance.
Preferably, the first wet-cure is to maintain the humidity of the substrate at 30% -60% for 45-50 hours (preferably 48 hours).
Preferably, the second wet-cure is to maintain the moisture of the interlayer at 30% -60% for 48 hours to 7 days.
Preferably, the overall curing is to keep the humidity of the composite impermeable layer at 30% -60% until the compressive strength > of the composite impermeable layer is 20 MPa.
Preferably, the gel material a and the gel material B are prepared before the composite barrier layer is laid.
In a preferred embodiment, the method for laying the composite barrier layer of the present invention comprises the following steps:
step 1: the gel material A and the gel material B are respectively weighed according to the proportion provided by the first aspect of the invention through manual or mechanical weighing, and are conveyed to a storage bin.
Step 2: respectively mixing the raw materials to obtain a mixture A and a mixture B, and respectively adding water to mix into a slurry state according to the liquid-solid ratio of 10:1 to 1:1 to obtain a gel material A and a gel material B.
And step 3: paving a gel material A on a target site according to the thickness of a bottom layer of 10-50cm to form the bottom layer, and then carrying out first wet curing on the bottom layer for 45-50 hours (preferably 48 hours), namely carrying out non-floating curing, namely maintaining the humidity of the bottom layer material at 30% -60% for 45-50 hours, and not soaking the material with excessive water.
And 4, step 4: and paving a gel material B on the bottom layer according to the thickness of the middle layer of 20-50cm to form a middle layer, and then carrying out secondary wet curing on the middle layer for 48 hours to 7 days, namely, carrying out non-floating curing, namely, keeping the humidity of the middle layer material at 30% -60%, keeping the humidity for 48 hours to 7 days, and not soaking the material with excessive water. In this step, the thickness of the middle layer may not be greater than that of the bottom layer, and the wet curing time of the middle layer may be slightly longer than that of the bottom layer.
And 5: and paving the gel material A on the intermediate layer according to the thickness of the surface layer of 10-50cm to form the surface layer.
Step 6: and carrying out integral moist curing on the bottom layer, the middle layer and the surface layer until 28 days later, namely, carrying out non-floating curing, namely, keeping the humidity of the materials of each layer at 30-60%, and keeping the humidity of the materials of each layer until 28 days later, wherein the materials cannot be soaked in excessive water.
The inventor of the invention creatively designs the materials, the thicknesses and the laying methods of different layers of the composite impermeable layer through research, so that the different layers can realize different functions, and the layers can realize a synergistic effect after being combined, and the method comprises the following specific steps:
in the composite impermeable layer, the bottom layer and the surface layer respectively adopt the gel material A, and due to the interaction among various specific components of the gel material A, the bottom layer and the surface layer play the following roles in the composite impermeable layer: the compressive strength is increased, the porosity is reduced to increase the impermeability, and the gelled material is cured strongly to prevent dissolved alkaline substances from influencing the pH value of the water body.
In the composite impermeable layer, the middle layer adopts the gel material B, and the gel material B plays the following roles in the composite impermeable layer due to the interaction of various specific components: the breaking strength, the tensile strength and the shearing strength are improved.
In the composite impermeable layer, the bottom layer, the middle layer and the surface layer are compounded according to the thickness, so that the composite impermeable layer has the effects of synergistically increasing the mechanical strength, eliminating stress concentration and reducing the probability of material damage caused by stress action.
In the method for laying the composite impermeable layer, the first wet curing, the second wet curing and the overall wet curing are strictly performed, so that sufficient curing strength can be integrally obtained.
In conclusion, the invention makes creative design on the materials, thicknesses and laying methods of different layers of the composite impermeable layer, and finally realizes that the composite impermeable layer has beneficial impermeable performance, can meet the mechanical performance requirements, and is resistant to water immersion and acid-base corrosion. Through testing, the compressive strength of the composite impermeable layer of the invention>20MPa, permeability coefficient less than 10-7cm/s, can effectively prevent liquid such as water and the like from penetrating and permeating, and can not cause the pH value of the water body to be higher than 8 after being soaked by water for a long time.
Examples
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
The sources of the raw materials used in the examples are as follows:
| raw materials | Source |
| Fly ash | Inner Mongolia baotou second power plant |
| Lime | native-Mermet Right-flag trench gate Zhentong bay marine lime plant |
| Desulfurized gypsum | Inner Mongolia baotou second power plant |
| Granulated blast furnace slag | Water slag reservoir of iron and steel works of Baotou iron and Steel group company of inner Mongolia autonomous region |
| Steel slag | Steel-making slag pile of Baotou iron and Steel group company in inner Mongolia autonomous region |
| Tailing of ore dressing | Factory-selection tailing pond of Baotou iron and steel group company in inner Mongolia autonomous region |
| Stone powder | Mountain Qingqing mountain flour after shallow basket paving of shallow basket in inner Mongolian autonomous region |
| Rock wool | Refractory material factory of Baotou iron and Steel group company in inner Mongolia autonomous region |
| Industrial asbestos | Refractory material factory of Baotou iron and Steel group company in inner Mongolia autonomous region |
The test methods employed in the examples are as follows:
compressive strength: the test was carried out using an MHY-14989 model 100T press.
Permeability coefficient: the method is completed by adopting an HP-4.0 type automatic pressure regulating concrete impermeability instrument.
The pH value of the water body is as follows: and (3) injecting water into the composite impermeable layer and replacing the water injection once every 24 hours, recording the pH value and the water quantity of the water before and after each water injection, repeating for 7 days, changing the water replacement interval time from 24 hours to 1 week, measuring the pH value of the water for 1 time, and recording.
Example 1
In this example, the composition of gel material a is: 80 kg of fly ash, 5 kg of lime, 2 kg of desulfurized gypsum and 15 kg of blast furnace granulated slag; the composition of gel material B was: 95 kg of fly ash, 10 kg of lime, 2 kg of desulfurized gypsum and 5 kg of rock wool.
In this embodiment, the composite impermeable layer is laid by the following method:
step 1: weighing 80 kg of fly ash, 5 kg of lime, 2 kg of desulfurized gypsum, 15 kg of blast furnace granulated slag, 95 kg of fly ash, 10 kg of lime, 2 kg of desulfurized gypsum and 5 kg of rock wool, and conveying the materials to a storage bin.
Step 2: uniformly mixing 80 kg of fly ash, 5 kg of lime, 2 kg of desulfurized gypsum and 15 kg of blast furnace granulated slag to obtain a mixture A, and uniformly mixing 95 kg of fly ash, 10 kg of lime, 2 kg of desulfurized gypsum and 5 kg of rock wool to obtain a mixture B; adding water into the mixture A according to the liquid-solid ratio of 8:1, mixing to obtain a gel material A, and adding water into the mixture B according to the liquid-solid ratio of 8:1, mixing to obtain a gel material B.
And step 3: paving a gel material A on a target site according to the thickness of the bottom layer of 20cm to form the bottom layer, and then carrying out first wet curing on the bottom layer for 48 hours, namely keeping the humidity of the material of the bottom layer at about 60 percent for 48 hours, wherein the material cannot be soaked in excessive water.
And 4, step 4: and paving a gel material B on the bottom layer according to the thickness of the middle layer being 30cm to form the middle layer, and then carrying out secondary wet curing on the middle layer for 3 days, namely keeping the humidity of the middle layer material at about 60 percent and keeping for 3 days without soaking the material in excessive water.
And 5: and paving the gel material A on the intermediate layer according to the thickness of the surface layer of 20cm to form the surface layer.
Step 6: and carrying out integral wet curing on the bottom layer, the middle layer and the surface layer until 28 days, namely maintaining the humidity of each layer at about 60%, and carrying out curing until 28 days before being put into use.
Example 2
In this example, the composition of gel material a is: 70 kg of fly ash, 8 kg of lime, 2 kg of desulfurized gypsum and 20 kg of steel slag; the composition of gel material B was: 80 kg of fly ash, 15 kg of lime, 2 kg of desulfurized gypsum and 5 kg of industrial asbestos.
In this embodiment, the composite impermeable layer is laid by the following method:
step 1: weighing 70 kg of fly ash, 8 kg of lime, 2 kg of desulfurized gypsum, 20 kg of steel slag, 80 kg of fly ash, 15 kg of lime, 2 kg of desulfurized gypsum and 5 kg of industrial asbestos, and conveying the materials to a storage bin.
Step 2: uniformly mixing 70 kg of fly ash, 8 kg of lime, 2 kg of desulfurized gypsum and 20 kg of steel slag to obtain a mixture A, and uniformly mixing 80 kg of fly ash, 15 kg of lime, 2 kg of desulfurized gypsum and 5 kg of industrial asbestos to obtain a mixture B; adding water into the mixture A according to the liquid-solid ratio of 1:1, mixing to obtain a gel material A, and adding water into the mixture B according to the liquid-solid ratio of 1.5:1, mixing to obtain a gel material B.
And step 3: paving a gel material A on a target site according to the thickness of the bottom layer of 15cm to form the bottom layer, and then carrying out first moisture curing on the bottom layer for 50 hours, namely keeping the humidity of the material of the bottom layer at about 30% for 50 hours, wherein the material cannot be soaked in excessive water.
And 4, step 4: and paving a gel material B on the bottom layer according to the thickness of the middle layer being 30cm to form the middle layer, and then carrying out secondary wet curing on the middle layer for 5 days, namely keeping the humidity of the material of the middle layer at about 40% for 5 days without soaking the material in excessive water.
And 5: and paving the gel material A on the intermediate layer according to the thickness of the surface layer of 20cm to form the surface layer.
Step 6: the bottom layer, the middle layer and the surface layer are subjected to overall wet curing for up to 28 days, namely, the humidity of each layer of material is kept at about 40%, and the materials are subjected to curing until being put into use after 28 days.
Example 3
In this example, the composition of gel material a is: 72 kg of fly ash, 6 kg of lime, 3 kg of desulfurized gypsum and 17 kg of blast furnace granulated slag; the composition of gel material B was: 85 kg of fly ash, 11 kg of lime, 3 kg of desulfurized gypsum and 7 kg of rock wool.
In this embodiment, the composite impermeable layer is laid by the following method:
step 1: weighing 72 kg of fly ash, 6 kg of lime, 3 kg of desulfurized gypsum, 17 kg of blast furnace granulated slag, 85 kg of fly ash, 11 kg of lime, 3 kg of desulfurized gypsum and 7 kg of rock wool, and conveying the materials to a storage bin.
Step 2: uniformly mixing 72 kg of fly ash, 6 kg of lime, 3 kg of desulfurized gypsum and 17 kg of blast furnace granulated slag to obtain a mixture A, and uniformly mixing 85 kg of fly ash, 11 kg of lime, 3 kg of desulfurized gypsum and 7 kg of rock wool to obtain a mixture B; adding water into the mixture A according to the liquid-solid ratio of 0.4:1, mixing to obtain a gel material A, and adding water into the mixture B according to the liquid-solid ratio of 0.4:1, mixing to obtain a gel material B.
And step 3: paving the gel material A on a target site according to the thickness of the bottom layer of 30cm to form the bottom layer, rolling and compacting, and then carrying out first moisture curing on the bottom layer for 46 hours, namely keeping the humidity of the material of the bottom layer at about 30%, and keeping the moisture for 46 hours without soaking the material in excessive water.
And 4, step 4: and paving a gel material B on the bottom layer according to the thickness of the middle layer of 50cm to form the middle layer, rolling and compacting the middle layer, and then carrying out secondary wet curing on the middle layer for 48 hours, namely maintaining the humidity of the material of the middle layer at about 30% for 48 hours without soaking the material in excessive water.
And 5: and paving the gel material A on the intermediate layer according to the thickness of the surface layer of 35cm to form the surface layer.
Step 6: the bottom layer, the middle layer and the surface layer are subjected to overall wet curing for up to 28 days, namely, the humidity of each layer of material is kept at about 30%, and the materials are subjected to curing until being put into use after 28 days.
Example 4 to example 7
The compositions of gel material a and gel material B used in examples 4 to 7 are shown in table 1.
The laying method used in examples 4 to 7 is the same as in example 1, except that the components of gel material a and gel material B were adjusted as in table 1.
Table 1 units: kilogram (kilogram)
The composite impermeable layers of examples 1 to 7 were tested for compressive strength, permeability coefficient, and pH of water after being soaked in water for 14 days, and the results are shown in table 2
TABLE 2
As can be seen from the data in Table 2, the compressive strength of the composite impermeable layer finally obtained by adopting the technical scheme of the invention>20MPa, permeability coefficient less than 10-7cm/s, can effectively prevent the penetration of water and other liquids, and can not cause the pH value of the water body after being soaked by water for a long timeHigher than 8.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other substitutions, modifications, combinations, changes, simplifications, etc., which are made without departing from the spirit and principle of the present invention, should be construed as equivalents and included in the scope of the present invention.
Claims (8)
1. A method for laying a composite impermeable layer, characterized in that it comprises the following steps:
paving a gel material A on a target site to form a bottom layer, and carrying out first moisture maintenance on the bottom layer;
paving a gel material B on the bottom layer to form an intermediate layer, and carrying out secondary moisture curing on the intermediate layer;
paving a gel material A on the intermediate layer to form a surface layer;
carrying out integral maintenance; wherein:
the gel material A comprises the following components in parts by weight: 70-95 parts of fly ash, 5-15 parts of lime, 1-5 parts of desulfurized gypsum and one selected from 4-30 parts of blast furnace granulated slag, 4-30 parts of steel slag, 4-30 parts of mineral dressing tailings or 15-30 parts of stone powder with the grain size of 1-3 mm; the gel material A is obtained by adopting the following method: uniformly mixing the components to obtain a mixture A, and then mixing the mixture A by using water according to the liquid-solid ratio of 10:1 to 0.4: 1;
the gel material B comprises the following components in parts by weight: 70-95 parts of fly ash, 5-15 parts of lime, 1-5 parts of desulfurized gypsum and 1-10 parts of rock wool or industrial rock wool; the gel material B is obtained by adopting the following method: the components are mixed uniformly to obtain a mixture B, and then the mixture B is mixed by using water according to the liquid-solid ratio of 10:1 to 0.4: 1.
2. The laying method according to claim 1, wherein the gel material A comprises the following components in parts by weight:
70-80 parts of fly ash, 5-8 parts of lime, 2-5 parts of desulfurized gypsum and 15-20 parts of blast furnace granulated slag;
or 70-80 parts of fly ash, 5-8 parts of lime, 2-5 parts of desulfurized gypsum and 15-20 parts of steel slag;
or 80-90 parts of fly ash, 5-8 parts of lime, 1-2 parts of desulfurized gypsum and 4-14 parts of mineral dressing tailings;
or 75-85 parts of fly ash, 8-10 parts of lime, 2-5 parts of desulfurized gypsum and 15-20 parts of stone powder with the grain size of 1-3 mm.
3. The laying method according to claim 1, wherein the gel material B comprises the following components in parts by weight: 80-95 parts of fly ash, 10-15 parts of lime, 2-5 parts of desulfurized gypsum and 5-10 parts of rock wool or industrial rock wool.
4. A laying method according to any one of claims 1 to 3 wherein the thickness of the base layer and the face layer are in the range 10-50cm, respectively; the thickness of the intermediate layer is in the range of 20-50 cm; and the thickness of the middle layer is not more than that of the bottom layer.
5. A laying method according to any one of claims 1 to 3 wherein the first wet-cure is a humidity of the substrate of between 30% and 60% for between 45 and 50 hours.
6. A laying method according to any one of claims 1 to 3 wherein the first wet-cure is a humidity hold of the substrate of 30-60% for 48 hours.
7. A laying method according to any one of claims 1 to 3, wherein the second wet-curing is carried out by maintaining the moisture content of the interlayer at 30-60% for 48 hours to 7 days.
8. A laying method according to any one of claims 1 to 3, wherein said overall curing is such as to maintain the humidity of said composite barrier layer between 30% and 60% until the compressive strength > -20 MPa of said composite barrier layer.
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