KR102146728B1 - Compositions and Method to make multiple bio-liner of waste landfill by bio-barrier - Google Patents

Abstract

The present invention relates to a composite waterproof layer composition and a waterproof layer composing method using the same, wherein the composite waterproof layer composition can minimize harmful leachate generated in a daily or specified waste landfill from being leaked into the ground and, more specifically, to a composition and a composing method, wherein the composition is used in two safe and hygienic composite waterproof layers having an upper layer having a function of minimizing damage caused by freeze-thawing and drying action by mixing a specific material with earth subordinately generated in a waterproof layer forming site or earth and sand introduced from surroundings, a self-swelling function and a function of blocking a gap of soil particles and removing contaminants by proliferating microorganisms and forming a bio-film and a lower layer having strength increase action by self-stiffening.

Description

Compositions and Method to make multiple bio-liner of waste landfill by bio-barrier}

The present invention relates to a water-repellent composition capable of forming a water-repellent facility (a water-repellent layer and/or a barrier layer) of a landfill, and a method of forming a water-repelling facility for a landfill using the same.

Currently, the method of forming the landfill floor and/or the barrier layer (and/or barrier layer) of the final cover is to have a certain thickness that satisfies the water permeability coefficient stipulated in the Waste Management Act through compaction by mixing the barrier material with the original alumina. It is mainly used to form an order layer.

In the conventional method of forming a water layer (and/or barrier layer) in a landfill, it may be difficult to secure a water permeability coefficient depending on the physical properties of the original alumina, and if the original alumina has a high water permeability coefficient such as sandy soil, the amount of water intake The increase in construction cost is also an inevitable reality because it has to be increased.

Therefore, there is a need for an ordering layer composition material and an environment-friendly and economical waste landfill construction method that can improve the performance of the existing water-filling material, and that the original alumina can stably secure the water permeability coefficient in the case of sandy soil as well as clay soil.

In addition, the order layer (and/or barrier layer) of the existing landfill has a three-layer structure: the upper layer (BLT layer), the middle layer (BLM layer), and the lower layer (BLL layer), so the construction time and labor cost are increased due to the complicated process. There was a problem.

Korean Registered Patent Publication No. 10-0418560 (announcement date 2004.02.11.)

The present invention relates to a water barrier material for forming a complex order layer that can minimize ground leakage of harmful leachate from a landfill site (landfill site) for living or designated waste, and a method of forming a chasing layer using the same. An upper layer (BLT) that can minimize damage caused by freezing and thawing and dry-humidity by mixing specific materials with incidental soils or soils brought in from the vicinity, and microbial growth and bio-film with self-swelling function. ) The order layer was formed by forming a three-layered composite order layer composed of an intermediate layer (BLM) having an effect of closing the gaps of earth particles and removing contaminants by formation, and a lower layer (BLL) having an effect of increasing strength by self-hardening. A composition capable of forming an existing three-layered order layer into a two-layered order layer by replacing the upper layer (BLT) and the intermediate layer (BLM) with one layer, while having all the functions and effects of the existing BLT and BLM. It is intended to provide a method and a barrier material used therein.

That is, it is an object of the present invention to provide a nature-friendly barrier material used for forming an aqueous layer of a landfill, and a method of forming (forming) a waste landfill layer having excellent impermeability using the same.

In order to achieve the above object, the method of forming a composite water-repellent layer in a waste landfill by a bio-barrier of the present invention comprises: 1 step of preparing an upper layer and a lower layer, respectively; A second step of forming a lower layer by laying and compacting the lower layer laying material; And a third step of forming a lower layer by laying and compacting the upper layer laying material on the upper part of the lower layer to form a two-layered ordering layer, wherein the upper layer laying material is CMC (Carboxymethyl Celluose)-containing barrier material, soil, and water. And the lower layer paving material was prepared by mixing the silica fume-containing water shield, soil and water.

In addition, the present invention relates to a water barrier composition used in the method for forming a composite water barrier of a waste landfill by the bio-barrier, wherein the water barrier layer is a two-layer structure composed of a lower layer and an upper layer, and is used for forming an upper layer, The upper layer of the barrier material is CCMC (Carboxymethyl Celluose) 0.1 ~ 3% by weight, silicon dioxide (SiO ₂ ) 45 ~ 70% by weight, aluminum oxide (Al ₂ O ₃ ) 5 ~ 15% by weight, sulfur trioxide (SO ₃ ) 0.1 ~ 2 It may include weight %, iron oxide (Fe ₂ O ₃ ) 2.0 to 8.0 weight %, calcium oxide (CaO) 0.1 to 10 weight %, and the balance of calcium mixture.

In addition, the present invention relates to a water barrier composition used in the method for forming a composite water barrier of a landfill by the bio-barrier, wherein the water barrier layer is a two-layer structure composed of a lower layer and an upper layer, and as a water barrier material for forming a lower layer, the lower layer The forming material is silica fume (Sillica fume) 0.1 to 3.0 wt%, calcium oxide (CaO) 50 to 70 wt%, silicon dioxide (SiO ₂ ) 5 to 20 wt%, aluminum oxide (Al ₂ O ₃ ) 2 to 10 It may include a weight %, sulfur trioxide (SO ₃ ) 5 to 20 weight %, iron oxide (Fe ₂ O ₃ ) 0.5 to 5.0 weight %, magnesium oxide (MgO) 1.0 to 4.0 weight %, and a balance of calcium mixture.

The water-repellent layer formed by the composition method of the present invention exhibits sufficient strength to support the load of working vehicles and landfill wastes, while at the same time securing low permeability of 1×10 ^-7 cm/sec or less, and by freezing and thawing. It can prevent surface deterioration, remove contaminants in leachate by forming a bio-barrier by microorganisms in the water layer and reduce the water permeability coefficient, and even when crack damage of the order water layer due to external impact such as differential settlement, the damaged area It can be usefully used to minimize ground leakage of harmful leachate because it can restore a large part of the damaged area by proliferation of microorganisms and the creation of new minerals (CaCO ₃ , BaCO ₃ ).

1 is a photograph (or process chart) schematically showing a method of forming an aqueous layer of a landfill using a barrier material according to an embodiment of the present invention.
2 is a measurement result of a freezing and melting test of an upper layer (or BLM).
3 is a measurement result of the permeation test of the upper layer (or BLM).
4 is a result of measuring the moisture absorption capacity of the upper layer (or BLM).
5 is a result of measuring the uniaxial compressive strength of the lower layer (or BLL).
6 is a result of measuring the permeability coefficient of the lower layer (or BLL).
7 is a schematic process diagram showing a process of manufacturing a paving material for forming an upper layer and/or a lower layer by using a selective mixing device.

The present invention is intended to illustrate specific embodiments and to be described in detail in the detailed description, since various transformations can be applied and various embodiments can be provided. However, this is not intended to limit the present invention to a specific embodiment, it is to be understood as including all conversions, equivalents, and substitutes included in the spirit and scope of the present invention.

The first step of manufacturing an upper layer laying material and a lower layer laying material as an order layer of a two-layer structure, unlike the existing three-layered order layer, in the order layer formed by the method of forming the order layer of the present invention; A second step of forming a lower layer by laying and compacting the lower layer laying material; And a third step of forming a lower layer by laying and compacting the upper layer laying material on the upper part of the lower layer. The order layer having a two-layer structure may be formed.

The upper layer laying material and the lower layer laying material of the first step are prepared by mixing the soil and the barrier material, and may be carried out using a conventional mixing method or a mixing device, and specifically, a selective mixing device as shown in FIG. 7 is used. It may be desirable to mix.

The sorting mixing device of FIG. 7 is a first transport device including a screening device 1 for sorting soil, a conveyor 2a for transporting the sorted soil to a soil metering device, and a motor 2b for operating the conveyor. A second transport comprising a soil metering device (3) for weighing the soil, a conveyor (4a) for conveying the measured soil to a mixing device for mixing with the soil hardener composition, and a motor (4b) for operating the conveyor Device, mixing device (5) for supplying and mixing the measured soil barrier material composition to the transported soil, metering supply device (6) for supplying CMC powder and silica fume powder at a predetermined mixing ratio according to the weight of the soil, mixing A third transport device including a conveyor 7a for transporting the mixed soil mixed in the device and a motor 7b for operating the conveyor, the content controlled to have an optimum water content ratio from the water content in the natural state of the soil for the mixed soil It includes an automatic water spraying device (8) for spraying water with an automatic water spray device (8), and an outlet (9) for discharging the resulting paving material, and for uniform mixing of the soil and soil hardener composition while blocking the generation of scattering dust. It may optionally further include a stirring device (10).

By using the selective mixing device as described above, it is difficult to quantitatively improve the soil and the barrier material, and unlike conventional selective mixing equipment that cannot adjust the water content of the original soil during the mixing process, the original soil and the soil barrier material composition are selected and In the process of mixing, the mixing flavor of the water barrier composition according to the weight of the soil can be constantly improved and added, and since the water spraying device can maintain an appropriate water content, uniform quality can be achieved.

The upper layer paving material may be prepared by mixing CMC (Carboxymethyl Celluose)-containing barrier material, soil and water, and the lower layer laying material may be prepared by mixing silica fume-containing barrier material, soil and water. In this case, the maximum dry density and the optimum water content are calculated through the moisture content of the soil and the power at the time of compaction, and water can be further mixed in an amount that satisfies the water content. It can be manufactured so that the laying material has an appropriate moisture content. In addition, it may be preferable that the water content in the paving material be included in an amount of 5% by weight or less based on the total weight of the mixture of the soil and the soil hardener composition. If the water content exceeds 5% by weight, it is not preferable because it takes a lot of time to cure.

In addition, it is preferable to mix the barrier material and soil in a ratio of 5 to 10: 90 to 95 by weight in consideration of the workability and economics.

The upper layer formed by the upper layer laying material contains CMC, which activates the generation of bio-barriers, has excellent effect of reducing the water permeability, and imparts resistance to freezing and thawing due to climate change.

Among the components of the top layer laying material, the carboxymethyl celluose (CMC)-containing carbohydrate is CMC (Carboxymethyl Celluose) 0.1 to 3% by weight, silicon dioxide (SiO ₂ ) 45 to 70% by weight, aluminum oxide (Al ₂ O ₃ ) 5 to 15% by weight %, iron oxide (Fe ₂ O ₃ ) 2.0 to 8.0 wt%, magnesium oxide (MgO) 1 to 4 wt%, sulfur trioxide (SO ₃ ) 0.1 to 2 wt%, calcium oxide (CaO) 0.1 to 10 wt% and the balance It may include a calcium mixture, preferably CMC 2.0 to 3.0 wt%, silicon dioxide 52 to 65 wt%, aluminum oxide 8.0 to 14.5 wt%, iron oxide 3.0 to 7.5 wt%, magnesium oxide 2.0 to 3.8 wt%, sulfur trioxide It may contain 0.1 to 1.0% by weight, 2.5 to 6.5% by weight of calcium oxide, and the balance of calcium mixture.

Among the CMC-containing waterproofing material, which is the upper layer's waterproofing material, CMC is responsible for reducing the water permeability since it can maximize moisture absorption to fill the voids between soil particles and activate bio-barrier formation. Silver is preferably 0.1 to 3% by weight, and if the CMC content is less than 0.1% by weight, there may be a problem that the moisture absorption and expansion effect is insignificant because the content is too small, and if it exceeds 3% by weight, there is a problem in terms of workability and economy. Since there may be, it is better to include within the above range.

In addition, silicon dioxide, aluminum oxide, iron oxide, magnesium oxide, sulfur trioxide, calcium oxide, and calcium mixtures, which are other top layer insulating components, are preferably used in the above content ranges in terms of ease of construction and economy.

The lower layer formed by the lower layer laying material among the order layers improves the compressive strength of the order layer and enables early strength to be secured, thereby securing stability against settlement and shortening the construction period.

The silica fume-containing waterproofing material for the lower layer is 0.1 to 3.0% by weight of silica fume, 5 to 20% by weight of silicon dioxide (SiO ₂ ), 2 to 10% by weight of aluminum oxide (Al ₂ O ₃ ), iron oxide ( Fe ₂ O ₃ ) 0.5 to 5.0 wt%, magnesium oxide (MgO) 1.0 to 4.0 wt%, sulfur trioxide (SO ₃ ) 5 to 20 wt%, calcium oxide (CaO) 50 to 70 wt%, and the balance of calcium mixture It may contain, and preferably, silica fume 1.0 to 3.0 wt%, silicon dioxide 8.5 to 17.5 wt%, aluminum oxide 3.0 to 8.0 wt%, iron oxide 0.8 to 3.5 wt%, magnesium oxide 1.0 to 3.0 wt%, sulfur trioxide 8.0 to It may contain 15.5% by weight, 55 to 65% by weight of calcium oxide, and a balance of calcium mixture.

Among the insulating materials containing silica fume, silica fume can improve the strength due to the filling effect required due to the characteristics of the lower layer, and also shorten the construction period by shortening the curing period for the construction of the upper layer, thereby expressing early strength. As such, the content in the barrier material is preferably 0.1 to 3.0% by weight, and if the silica fume content is less than 0.1% by weight, the content may be too small and there may be a problem of expressing early strength, and if it exceeds 3.0% by weight, it is economical. Since there may be problems such as deterioration and generation of cracks after construction, it is better to include them within the above range.

Other waterproofing materials for the lower layer are content ranges that can secure appropriate compressive strength and water permeability through chemical reactions, and if they are outside this content range, there may be problems such as difficulty in construction and economical deterioration. good.

And, the calcium mixture of the CMC-containing barrier material and/or silica fume-containing barrier material is 50 to 500 parts by weight of calcium oxide (CaO) and calcium hydroxide (Ca(OH) ₂ ) based on 100 parts by weight of calcium carbonate (CaC0 ₃ ). It may contain 1 to 50 parts by weight, preferably calcium oxide (CaO) 300 to 460 parts by weight and calcium hydroxide (Ca (OH) ₂ ) 4 to 30 parts by weight based on 100 parts by weight of calcium carbonate (CaC0 ₃ ), further Preferably, it may contain 350 to 450 parts by weight of calcium oxide (CaO) and 5 to 20 parts by weight of calcium hydroxide (Ca(OH) ₂ ) based on 100 parts by weight of calcium carbonate (CaC0 ₃ ).

The moisture content of the laying material in the 2nd and/or 3rd steps should be measured through a pre-indoor test before construction, and the optimal water content ratio of the site soil should be measured, and the process to match the optimal water content ratio is to maintain a constant moisture content through the automatic water spraying device shown in FIG. It is possible.

In addition, the laying process of step 2 and/or step 3 may be carried out according to a conventional laying method, and in detail, after transporting the laying material to a place where packaging is required, equipment such as an excavator or bulldozer is used. It is carried out by a mechanical laying process in which an approximate amount is spread on the ground to be packaged, and a manpower laying process in which the worker forms the laying material on the ground to be evenly packaged in a state that is spread on the ground in a continuous process. It may be desirable.

As a result of the laying process, a compaction process of compacting the laying material formed with a uniform pavement height on the ground to be packaged may be performed. The laying process may be carried out according to a conventional laying method, and in detail, after transporting the laying material to a place requiring order, a mechanical spreading an approximate amount on the target resin using equipment such as an excavator or bulldozer It may be preferable to perform the laying process and a manpower laying process in which the worker forms the mixed soil to have a uniform laying height on the ground to be placed in a state that is spread on the resin to be placed in a continuous process.

As a result of the laying process, a compaction process in which the mixed soil formed with a uniform thickness on the resin to be charged may be compacted using a device such as a tire roller may be performed.

Fig. 1 shows an example of forming the order layer of the final covered soil by using the method of forming a composite order layer in a landfill site using the bio-barrier of the present invention.

Hereinafter, the present invention will be described in more detail by specific examples. However, the following examples are only to specifically illustrate the present invention, and the content of the present invention is not limited by the following examples.

[Example]

Example 1: Preparation of the upper layer shielding material

In the reactor, CMC (Carboxymethyl Celluose) 3.0% by weight, Si0 ₂ 58.7% by weight, Al ₂ 0 ₃ 12.9% by weight, Fe ₂ 0 ₃ 5.0% by weight, MgO 2.9% by weight, SO ₃ 0.4% by weight and the balance of calcium mixture are mixed Then, the mixture was stirred to prepare a water shield for the upper layer. At this time, the calcium mixture is prepared by mixing 417 parts by weight of CaO and 8.3 parts by weight of Ca(OH) _{2 based} on 100 parts by weight of CaC0 ₃ .

Example 2: Fabrication of the waterproofing material for the lower layer

In the reactor, silica fume 3.0 wt%, Si0 ₂ 13.9 wt%, Al ₂ 0 ₃ 5 wt%, Fe ₂ 0 ₃ 1.6 wt%, MgO 1.9 wt%, SO ₃ 10.0 wt%, CaO 61.1 wt%, and the balance of calcium mixture After mixing, the mixture was stirred to prepare a water barrier material for the lower layer.

The calcium mixture is prepared by mixing 417 parts by weight of CaO and 8.3 parts by weight of Ca(OH) _{2 based} on 100 parts by weight of CaC0 ₃ .

Comparative Example 1

The composition and composition ratio as shown in Table 1 were mixed to prepare a waterproofing material for the upper layer.

Comparative Example 2

The composition and composition ratio as shown in Table 1 were mixed to prepare a waterproofing material for the lower layer.

division Composition (% by weight) Example 1
(Upper floor) CMC SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ MgCO ₃ MgO SO ₃ CaO Calcium mixture 3.0 58.7 12.9 5.0 - 2.9 0.4 4.1 Remaining balance Comparative Example 1
(Upper floor) CMC SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ MgCO ₃ MgO SO ₃ CaO Calcium mixture - 58.7 12.9 5.0 - 2.9 0.4 Remaining balance - Example 2
(Lower floor) Silica fume SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ MgCO ₃ MgO SO ₃ CaO Calcium mixture 3.0 13.9 5.0 1.6 - 1.9 10.0 61.1 Remaining balance Comparative Example 2
(Lower floor) Silica fume SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ MgCO ₃ MgO SO ₃ CaO Calcium mixture - 13.9 5.0 1.6 - 1.9 10.0 Remaining balance -

Experimental Example 1: Basic physical property test of the soil to be tested

Basic physical property tests, specific gravity tests, compaction tests, and water permeability tests were performed on the soil used in the formation of the aqueous layer according to the present invention. The results are described in Table 2 together with the test method.

Item Test Methods Test result Soil particle density (Gs) KS F 2308: 2006 2.678 Water content ratio (Wn) KS F 2306: 2000 11.7% Particle size analysis (engineering classification) KS F 2324: 2006 *SM Liquid limit (LL) KS F 2303: 2000 **NP Firing limit (PL) KS F 2303: 2000 **NP Maximum dry density (γdmax, t/m ³ ) KS F 2312: 2002 1.998 Optimal function ratio (O.M.C) KS F 2312: 2002 10.4% Permeability coefficient (cm/sec) KS F 2322: 2002 8.8×10 ^-6 * SM: Coarse soil sand, containing 12% by weight or more of fine powder (mo)
**NP: Non Plastic

As a result, the soil used for the formation of the aqueous layer was analyzed as a sandy soil system in which silt and sand were mixed as SM-series soil under the unified classification method. In addition, the maximum dry density of the soil was 1.998t/m ³ and the optimum moisture content (OMC) was 10.4%.

Practice Example 2: Hazardous Substance Dissolution Test for Carrying Materials

The dissolution test of hazardous substances for environmental review was performed on the shielding material prepared in Examples 1 to 2. The results are shown in Table 3 below.

Detecting whether or not the light ^- as a toxic substance dissolution test according to the Waste Management Act based, lead (Pb), cadmium (Cd), 6 a chromium (Cr ^6+), arsenic (As), mercury (Hg), cyanide ion (CN) Was confirmed. The results are shown in Table 3 below.

division Hazardous substances (ppm) Pb CD Cr ⁶⁺ As Hg CN Acceptance standards under the Waste Management Act 3 0.3 1.5 1.5 0.005 1.0 Example 1 (upper layer shielding material) ND* ND ND ND ND ND Example 2 (lower layer shielding material) ND* ND ND ND ND ND * ND: Not Detectable

As shown in Table 3, the heavy metal component in the interior material of Examples 1 and 2 was not detected, and from this, it can be confirmed that the interior material according to the present invention is an eco-friendly material.

Experimental Example 3: Freeze-thawing test of the upper layer barrier material

Freeze-thawing test to evaluate whether the constructed water-repellent layer has sufficient durability and stability to withstand the climate change phenomenon of Samhansaon, which is the winter climate characteristic of Korea, when constructing the water-repellent layer with the upper layer shielding material (Example 1) according to the present invention And observed whether cracks occurred due to freezing and thawing.

Specifically, the freeze-thaw test was performed according to the freeze-thaw test (KS F 2332) shown in Table 4 below for a mixture of soil and cement, which was ground according to the KS F test regulations issued by the Korean Standards Association.

Test name Freeze-thawing test of crushed soil and cement mixture (KS F 2332) Cycle standard 1 cycle (48 hours): Test under -23℃ (24 hours) and then under 21℃ (23 hours) (12 cycles in total) Evaluation item Weight reduction rate of specimen according to freeze-thaw cycle (%)

A sample was prepared by mixing the soil containing a mixture of minced soil and cement and the barrier material of Example 1 at a mixing ratio (soil: mixing weight ratio of additives = 90:10), and the weight change of the specimen after damage according to the freeze-thaw test The trend was observed to evaluate the resistance to freezing and thawing. At this time, as a control, a specimen molded only from soil was used.

The weight reduction ratio of these three specimens was calculated every three cycles until the end of the 12 cycles, and the results are shown in Table 5 and Fig. 2 below.

division Specimen composition Weight reduction rate (%) 3 cycles 6 cycles 9 cycles 12 cycles Control 100% soil 4.3 4.9 5.5 5.9 Comparative Production Example 1 10% of the repellent material of Comparative Example 1 + 90% of soil 2.3 2.8 3.1 3.3 Manufacturing Example 1 10% repellent material of Example 1 + 90% soil 0.9 1.3 1.5 1.6

As shown in Table 5 and FIG. 2, as a result of calculating the weight reduction rate after 12 cycles, in the case of the control specimen made only with ordinary soil, a rapid increase to the level of 4.3% after 3 cycles and 5.9% after 12 cycles Indicated. On the other hand, in the case of Comparative Production Example 1, which included Comparative Example 1, which is an existing vehicle, as 10% by weight of the total weight of the specimen, the weight reduction rate was 3.3% after the end of 12 cycles. In the case of Preparation Example 1, the weight reduction ratio of the specimen was 1.6% even after 12 cycles, and the weight reduction ratio of the specimen showed a gentle change.

From these experimental results, it can be confirmed that the specimen manufactured using the shielding material according to the present invention exhibits excellent freeze-thaw resistance against a rapid temperature change phenomenon.

Experimental Example 4: Water permeability test of the upper layer using the upper layer barrier material

The most important design factor in constructing the water layer is the water permeability. In this test, the permeability coefficient of the specimen was measured using the variable head test method and shown in Table 6 and FIG. 3.

The permeability coefficients for each formulation were measured. As a result of the measurement, in the case of specimens made only of ordinary soil, 8.8×10 ^-6 cm/sec, which did not satisfy the design standard of 1.0×10 ^-7 cm/sec, which is the design standard of the bottom order layer of the waste landfill. sec, but in the case of Example 1 specimen in which the existing BLM additive was blended, 7.5 × 10 ^-8 cm/sec, in the case of the specimen in Preparation Example 1 (using the shielding material of Example 1), in which the improved BLM additive was blended, 3.3 × 10 ^{As -8} cm/sec, the impermeability is improved.

division Specimen composition Permeability coefficient (cm/sec) Control 100% soil 8.8×10 ^-6 Comparative Production Example 1 10% of the repellent material of Comparative Example 1 + 90% of soil 7.5×10 ^-8 Manufacturing Example 1 10% of the repellent material of Preparation Example 1 + 90% of soil 2.3×10 ^-8

As shown in Table 6 and FIG. 3, Preparation Example 1 was significantly improved and stable impermeable performance compared to the test sample using the control material of 100% general soil and the water shield of Comparative Example 1.

Experimental Example 5: Water absorption test

After each of the waterproofing materials of the same composition and composition ratio was prepared by only different types of CMC of the upper layer barrier material prepared in Example 1, the moisture absorption rate was measured, and the results are shown in Table 7 and FIG. 4 below. Each of Preparation Example 1 and Comparative Preparation Example 1-1 to Comparative Preparation Examples 1 to 3 of Table 8 is a specimen containing 10% by weight of a water shield and 90% by weight of soil.

division Ingredients in the vehicle Water absorption ability (g/g) Manufacturing Example 1 CMC 62 Comparative Production Example 1-1 Starch 4 Comparative Production Example 1-2 Wheat fiber 5 Comparative Production Example 1-3 Bentonite 24

Looking at Tables 7 and 4, it was confirmed that a specimen prepared using a water shielding material in which CMC was introduced as a water shielding material had a very high moisture absorption ability.

Experimental Example 6: Uniaxial compressive strength test

For the early construction of the upper layer (BLM layer) that is continuously constructed after the construction of the lower layer (BLL layer) of the order layer, securing the early strength of the lower layer is a requirement to shorten the construction period of the order layer.

In order to check whether the early strength was developed by comparing the strength of each of the specimens containing the lower layer of the present invention, the case where the general soil was applied (control) and the existing watering material (Comparative Example 2) A uniaxial compressive strength test was conducted.

In the preparation of the specimens used in the experiment, 10% by weight was added to the waterproofing material based on the maximum dry density (γmax) of each soil. After that, it was cured in a constant temperature and humidity state. In addition, the uniaxial compressive strength by age of 3, 7, 14, and 28 days was tested, and the results are shown in Tables 8 and 5 below.

division Components of the specimen Uniaxial compressive strength (kg/cm ² ) 3 days 7 days 14 days 28 days Control 100% by weight of general soil 0.5 1.0 1.3 1.5 Comparative Production Example 2 90% by weight of general soil
10% by weight of the waterproofing material of Comparative Example 2 3.3 5.8 8.1 9.2 Manufacturing Example 2 90% by weight of general soil
10% by weight of the waterproofing material for the lower layer of Example 2 8.1 10.5 12.0 13.7

Looking at the measurement results of the uniaxial compressive strength in Table 8 and FIG. 5, in the case of the control group produced only with general soil, it was only 0.5 kg/cm ^{2 for} 3 days of age and 1.5 kg/cm ² for 28 days. Comparative Production example 2 of specimens age 3 days in the specimen 3.3㎏ / ㎝ ^2, the 28 days 9.2㎏ / ㎝ ² showing the other hand, in example 2, the order of the lower layer material formulation for preparation 2 is age 3 days 8.1㎏ /Cm ² , it was confirmed that there is an excellent strength enhancing effect as 13.7 kg/cm ^{2 on} 28 days. In particular, it was confirmed that the construction schedule can be shortened due to the early strength development when considering the site schedule where the upper layer (BLM layer) is continuously constructed after the construction of the lower layer (BLL layer) on the construction schedule.

Experimental Example 7: Water permeability test of the lower layer using the lower layer barrier material

Unlike the existing waterproofing material, the lower layer barrier material of Example 2 is a material obtained by adding silica fume, and the silica fume is an ultrafine powder having an average particle diameter of 0.1 μm, and the amorphous silica (SiO ₂ ) component occupies most of the material. When mixed and used, the pores and discontinuities between the repellent particles are filled, and the structure is made more dense by the pozzolanic reaction along with the microfilter effect, thereby enhancing the strength. In fact, according to the trend of ultra-high-rise concrete structures, the proper use of silica fume and high-fine powder binders is becoming common for the purpose of improving durability and strength when mixing design of ultra-high-strength concrete.

The change of the water permeability was measured by comparing the case of using the lower layer barrier material (Example 2) of the present invention and the case where the existing barrier material (Comparative Example 2) was mixed with soil, and the results are shown in Table 9 below. It is shown in 6.

division Components of the specimen Permeability coefficient (cm/sec) Comparative example 100% by weight of general soil 8.8×10 ^-6 Comparative Production Example 2 90% by weight of general soil and 10% by weight of the waterproofing material of Comparative Example 2 8.2×10 ^-8 Manufacturing Example 2 90% by weight of general soil and 10% by weight of the waterproofing material of Example 2 5.4×10 ^-8

As a result of the measurement, in the case of the specimen of Comparative Production Example 2, in which the existing water shielding material of Comparative Example 2 was blended, the water permeability coefficient was about 8.2×10 ^-8 cm/sec, whereas the specimen of Preparation Example 2 containing the water shielding material of Example 2 In this case, it was confirmed that the water permeability coefficient was 5.4 × 10 ^-8 cm/sec, which improves the water impermeability required for the construction of the order layer.

From the above experimental results, the bottom water layer composition according to the present invention is an eco-friendly material that has secured water impermeability that meets the acceptance criteria under the Waste Management Act, and when constructing the water layer using this, the construction body is It can be seen that it has durability that can exhibit sufficient resistance.

As described above, one embodiment of the present invention has been described, but those of ordinary skill in the relevant technical field add, change, delete, or add components within the scope not departing from the spirit of the present invention described in the claims. Various modifications and changes can be made to the present invention by means of the like, and it will be said that this is also included within the scope of the present invention.

1: screening device
2a, 4a, 6a: conveyor
2b, 4b, 6b: motor
3: soil metering device
5: mixing device
7: Automatic water spraying device
8: outlet
9: stirring device

Claims (8)

delete Step 1 of each of the upper layer laying material and the lower layer laying material;
A second step of forming a lower layer by laying and compacting the lower layer laying material; And
3 step of forming a lower layer by laying and compacting the upper layer laying material on the upper portion of the lower layer; forming a two-layered order layer comprising,
The upper layer laying material is prepared by mixing carboxymethyl celluose (CMC)-containing carbohydrate, soil and water,
The lower layer laying material is prepared by mixing a silica fume-containing water shield, soil and water,
The carboxymethyl celluose (CMC) containing carboxy material is CMC (Carboxymethyl celluose) 0.1 to 3% by weight, silicon dioxide (SiO ₂ ) 45 to 70% by weight, aluminum oxide (Al ₂ O ₃ ) 5 to 15% by weight, iron oxide (Fe ₂ O ₃ ) 2.0 to 8.0% by weight, magnesium oxide (MgO) 1 to 4% by weight, sulfur trioxide (SO ₃ ) 0.1 to 2% by weight, calcium oxide (CaO) 0.1 to 10% by weight, and the balance of calcium mixture A method of forming a complex water-repellent layer in a waste landfill site by bio-barrier, characterized in that. The method of claim 2, wherein the silica fume-containing barrier material is silica fume 0.1 to 3.0% by weight, silicon dioxide (SiO ₂ ) 5 to 20% by weight, aluminum oxide (Al ₂ O ₃ ) 2 to 10% by weight, Iron oxide (Fe ₂ O ₃ ) 0.5 to 5.0 wt%, magnesium oxide (MgO) 1.0 to 4.0 wt%, sulfur trioxide (SO ₃ ) 5 to 20 wt%, calcium oxide (CaO) 50 to 70 wt%, and the balance of calcium Bio-barrier, characterized in that it comprises a mixture, a method of forming a complex order layer of a waste landfill. The method of claim 2, wherein the upper layer laying material comprises a CMC-containing water shield and soil in a weight ratio of 5 to 10: 90 to 95,
The lower layer laying material is a bio-barrier, characterized in that it comprises a silica fume-containing barrier material and soil in a weight ratio of 5 to 10: 90 to 95. The method of claim 2 or 3, wherein the calcium mixture is
Composite of a waste landfill by bio-barrier, characterized in that it contains 50 to 500 parts by weight of calcium oxide (CaO) and 1 to 50 parts by weight of calcium hydroxide (Ca(OH) ₂ ) based on 100 parts by weight of calcium carbonate (CaC0 ₃ ) How to create an order layer. [3] The method of claim 2, wherein the ordering layer is one layer selected from the ordering layer of the floor ordering facility of the waste landfill and the blocking layer of the final covering layer. As a barrier material used to form the barrier layer of a landfill,
The water-order layer is a two-layer structure composed of a lower layer and an upper layer, the water-shielding material is a water-shielding material for forming an upper layer,
The upper layer forming material is CMC (Carboxymethyl Celluose) containing carboxymethyl celluose (CMC) 0.1 ~ 3% by weight, silicon dioxide (SiO ₂ ) 45 ~ 70% by weight, aluminum oxide (Al ₂ O ₃ ) 5 ~ 15% by weight , Iron oxide (Fe ₂ O ₃ ) 2.0 to 8.0 wt%, magnesium oxide (MgO) 1 to 4 wt%, sulfur trioxide (SO ₃ ) 0.1 to 2 wt%, calcium oxide (CaO) 0.1 to 10 wt% and the balance of calcium A composite layer composition of a waste landfill by bio-barrier, characterized in that it comprises a mixture. As a barrier material used to form the barrier layer of a landfill,
The waterproofing layer is a two-layer structure composed of a lower layer and an upper layer, and the waterproofing material is a waterproofing material for forming a lower layer,
The insulating material for forming the lower layer is silica fume (Sillica fume) 0.1 to 3.0% by weight, calcium oxide (CaO) 50 to 70% by weight, silicon dioxide (SiO ₂ ) 5 to 20% by weight, aluminum oxide (Al ₂ O ₃ ) 2 ~ 10% by weight, iron oxide (Fe ₂ O ₃ ) 0.5 ~ 5.0% by weight, magnesium oxide (MgO) 1.0 ~ 4.0% by weight, sulfur trioxide (SO ₃ ) 5 ~ 20% by weight, calcium oxide (CaO) 50 ~ 70% by weight , And a residual amount of a calcium mixture, characterized in that the composite water-repellent layer composition of a waste landfill by a bio-barrier.

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