KR20010037993A - Soil concreting composition and process for executing soft ground of filled-up-land for household wastes and lndustrial wastes using the same - Google Patents

Abstract

PURPOSE: Provided are a soil concreting composition and a construction method for treating soft ground of a reclaimed land for garbage and industrial wastes by using the composition, which can prevent leachate from permeating into soil and groundwater of the reclaimed land. CONSTITUTION: The soil concreting composition comprises 2-5wt.% of unslaked MgO and gypsum powder, 80wt.% of field soil such as mountain or coastal soil, 2-5wt.% of unslaked lime, 10-15wt.% of cement, 1-2wt.% of clear waterproof liquid and urine, 1-2wt.% of water, and 1-2wt.% of a soil concreting mixture comprising 0.05-0.35wt.% of potassium chloride, 0.03-0.25wt.% of calcium chloride, 0.03-0.20wt.% of magnesium chloride, 0.03-0.20wt.% of sodium chloride, 0.0002-0.01wt.% of cobalt chloride, 0.0002-0.01wt.% of silica, 0.001-0.02wt.% of sodium sulfate. The construction method for treating the soft ground of the reclaimed land is performed by concreting a groundwater flowing layer(12) to have a thickness of 0.3-0.4m, a groundwater efflux freeze protection layer(13) to have a thickness of 0.2-0.3m, and a leachate shielding and waterproof surface layer(14) to have a thickness of 0.1-0.3m by using the soil concreting composition.

Description

Soil concreting composition and process for executing soft ground of filled-up-land for household wastes and lndustrial wastes using the same}

This invention is a civil engineering technology that concretely mixes local soil (field soil, paddy soil, mountain soil, coastal soil, mud flat, polluted solid waste, etc.) with soil concrete composition, mineral powder and cement without using sand and gravel. As a field, the present invention relates to a treatment method for concreteizing the soft ground of landfill and industrial waste landfill, and a soil concrete composition for concreteizing the soil of the ground.

When landfilling industrial wastes and industrial wastes, they are landfilled without any construction treatment, and the leachate generated from the household wastes and various industrial wastes contaminates the landfill soil and further contaminates the groundwater of the landfills. Destroy the environment.

Conventionally, when landfills of household waste and industrial wastes are landfilled, they are landfilled at random without any treatment or treated with vinyl sheet lining (polyethylene sheet lining) and earth lining (low viscosity, bentonite). Although they were landfilled, their construction methods caused various problems in the prevention of pulp and required excessive facility expenses.

In addition, when the civil engineering work on the soft ground, heavy equipment should be put in, but because the construction of heavy equipment can not be settled, there is a problem to cover the soil using a large amount of soil and stone, there is a problem to spend excessive construction costs.

The vinyl sheet lining method and the earth lining method are generally used, but there is a problem in precision construction.

Not only can it be installed on soft ground such as coastal landfills, but also after the construction, it can not withstand the load of landfills such as household waste and various industrial wastes, and the sheet tends to be damaged. Broken bottles, sharp metal debris, sharp stone debris, etc. are applied to the sheet to form holes, and harmful substances (poisons) caused by the decay of various wastes are damaged in the sheet, which is a practical problem.

In addition, the earth lining method causes the outflow of leachate to the surface and the bottom surface of the landfill, but there is a problem in the adhesion of clay particles having a permeability coefficient of 10 ⁻⁷ cm / sec or more and cannot be used.

Furthermore, the soft ground injection mixing method (Korean Patent Publication No. 92-4021,1992.5.22.) Can solidify the site soil of each landfill, but the rainwater and heavy metals generated when landfills of industrial wastes and industrial wastes are reclaimed. The containing leachate is impervious to permeate in the cracks generated by solidification without forming a completely waterproof concrete and contaminate the landfill soil of the groundwater.

That is, as a result of the test, the solidified soil is not obtained with a permeability coefficient of 10 ^-7 cm / sec or more, and contaminates the groundwater or soil through the solidified soil.

Leachate cannot be prevented because it falls short of environmental legislation enforced by the Ministry of Environment.

Therefore, the injection-mixing method of the above-cited patent cannot be used and has a disadvantage of requiring 7 days of solidification period.

Therefore, the present invention is to investigate the root cause of such pollution and to study effective countermeasures, and in order to block the groundwater inflow of the leachate and to prevent the contamination of the soil, the leachate is recovered without being lost to a certain treatment place. It is possible to achieve the object of the present invention by effectively treating the soft ground of the landfill by the soil concrete composition to prevent the leachate without the occurrence of cracks and to facilitate the construction and use of the structure on the soft ground. There is a technical problem.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic explanatory drawing of the processing method which concreteized the soft ground of the domestic waste and industrial waste landfill by this invention.

FIG. 2 is a schematic diagram of the first layer (groundwater distribution auxiliary base layer) of FIG. 1; FIG.

3 is a perspective view of the third layer of FIG. 1.

FIG. 4 is a schematic view of forming a leachate inflow path (bone) on the third layer of FIGS. 2 and 3;

5 is a schematic diagram of a method for constructing a soft ground civil construction according to the present invention.

<Description of the code | symbol about the principal part of drawing>

10: bottom plate

11: law

12,12 ": Groundwater distribution auxiliary layer on the first floor

13,13 ": Groundwater outflow freeze protection layer of the second layer

14,14 ": Leachate Completely Sealed Surface Layer 3

15: Vibration and load crack prevention pillar

a: Leachate inflow passage (gol)

Q: Slope

①, ②, ③, ④, ⑤, ⑥: Display construction order of each floor

Therefore, the present invention eliminates various problems that occur when landfilling the household waste and various industrial wastes by performing concrete conversion of the soil completely treated without cracking within 48 hours without simply solidifying the soil. Soft ground treatment of household waste and various industrial waste landfills, which prevents the leachate from the landfill of waste and wastes from penetrating into the land and groundwater of the landfill, and collects the leachate to a certain collection point. It is about a construction method.

In addition, the present invention is a raw MgO and gypsum powder, cement, landfill site soil (mountain soil, coastal soil, etc.), soil concrete mixture (potassium chloride, calcium chloride, magnesium chloride, sodium chloride, cobalt chloride, silicic acid, urine)尿), composed of sodium sulfate), transparent waterproofing liquid and water, to shorten curing time by concrete treatment (reduced from 3 days to 12 hours) and at the same time the coefficient of permeability is 10 ^-4 ~ 10 ^-10 cm / sec. The present invention relates to a soil concrete composition arbitrarily adjusted as possible.

Specific technical configurations for realizing the object of the present invention will be described below.

The soil concrete composition to be treated on the suspended landfill and the ground of the civil works will be described below.

This soil concrete composition is excellent in water resistance and resistant to acid alkali.

In terms of concentrated load, strength can be made strong and there is no fear of damage in case of any loads of foreign materials in waste and local soil. In the civil engineering works site, it is mainly composed of three floors to prevent permeation of leachate by floor and waterproof.

As a result, a permeability coefficient of 10 ^-4 -10 ^-10 cm / sec was established.

In addition, it has the adsorption capacity and the discharge capacity of water and plays the role of soil concrete with ion exchange capacity.

Moreover, even if the ground of the landfill is soft, it is safe because it is evenly settled by the support force of the strong concrete.

This is because this composition has elasticity.

It can be installed in any amount of rain and is permanently safe as it forms soil rock walls.

Compared with other methods (seat lining method, earth lining method), the construction cost is cheaper, the air is shorter, and the follow-up management is simple and economical.

As such, it is preferable that the soil concrete composition has the following composition.

Raw MgO and gypsum powder 25wt%, preferably 11wt%, quicklime 2-5wt%, local soil (mountain soil, coastal soil, etc.) 80wt%, soil concrete mixture (potassium chloride, calcium chloride, magnesium chloride, sodium chloride) , Cobalt chloride, silicic acid, urine, sodium sulfate) 1-2 wt%, particularly preferably 1wt%, water 1-2wt%, particularly preferably 2wt%.

The soil concrete mixture is potassium chloride 0.05-0.35w%, calcium chloride 0.03-0.25wt%, magnesium chloride 0.03-0.20wt%, sodium chloride 0.03-0.20wt%, cobalt chloride 0.0002-0.01wt%, silicic acid 0.0002-0.01wt%, It is preferable to test the composition of 0.001-0.02wt% sodium sulfate.

The composition as described above can change the composition ratio according to the properties of the local soil to form the concrete of the soil as a strong, and can adsorb and discharge the water (waterproof).

Thus, in the soil concrete composition, according to the mixing ratio of the production composition, the soil concrete has the effect of absorbing and discharging the soil (cationic ion exchange capacity) and water, and the leachate itself is effective in preventing leachate from the surface layer.

This effect is due to the mixing of urine in the soil concrete mixture, two bacteria, Bacillus pastiri and sporosarsina, inhabiting the soil, filling the gap of the cement unlike the waterproofing agent. This is because it forms a waterproof film on the surface of the particles of local soil.

At the same time, even if it is dropped into water and concrete, it will not only act as an emulsifier but also rapidly solidify the cement to solidify even coastal soil containing salts such as waste and tidal flats within 12 hours of test results.

And over time, it concretes.

In general, the soil is composed of clay and sand, and has various soil types according to the soil. The soil color becomes dark brown by plants, and the number of attachments around the soil particles such as complex polymer mixtures generated by decomposition of organic matter. It dissolves in and reacts with calcium ions in the cement paste to form a non-hydrophobic film on the surface of the cement hydrate and negatively interferes with the progress of after-crystallization.

Therefore, by using the soil concrete composition of the present invention, it is possible to eliminate the state of charge of the soil and to make the arrangement between particles by using ion exchange, and the component of urine generates carbon dioxide and ammonia, and water By reacting with the limestone of ammonium hydroxide, the bacteria in the soil can improve the adhesion and waterproofness of cement and improve the interparticle bonding, so that it can be improved to the concrete ground which is stable in the soft ground such as corrosive soil and clay.

The ground by the treatment of this invention inherits the properties of cement and the life of quicklime to stabilize the bearing capacity for a longer time than the concrete life of sand gravel in hydroponic state, and there is no fear of secondary pollution as pollution-free material.

The soil concrete composition of the present invention eliminates defects due to secondary pollution and aging due to lack of strength, elution of calcium ions, and the like.

Each element and mineral component contained in the soil concrete composition is ionized and actively active.

R-COOH forms a non-oil film by reacting with ions that inhibit the invasion of calcium ions by forming a group of ions near the soil particles. In addition to having adsorbed water containing water, the water molecules around the soil particles also have the effect of salting out of the ion group.

By such a mechanism, the gap between the soil particles is narrowed, and as the potential decreases, the soil particles become solidified and fine particles are connected between the soil particles which prevent the invasion of calcium ions, thereby forming an aggregation.

In addition, by forming an alkaline liquid phase, a hydrate such as calcium silica, which is a hydration reaction of cement, forms a half-phase crystal that becomes an intermediate role between soil particles, thereby rapidly growing.

That is, the fluidity of the cement paste is lost and the condensation reaction proceeds, thereby significantly improving the resistance to shear strength deformation required for the soil structure.

The soil concrete composition thus constructed is manufactured as follows.

Inject the required amount of water into the water tank, mix the prescribed soil concrete mixture, add the transparent waterproofing solution (required amount) and mix the mineral mixture.

The obtained mixed liquid is mixed and stirred with a mixing device such as ready-mixed concrete while spraying onto a sample (local soil + cement) 1 m ³ previously mixed with a liquid spraying device to obtain a soil concrete composition.

Pour the obtained concrete composition on the floor and surface of the landfiller to be constructed and compact it with a roller.

The construction method by this invention is demonstrated below according to drawing.

After stopping the landfill selected using the obtained soil concrete composition according to the present invention, the landfill 11 and the bottom 10 were constructed as shown in FIG. do.

The three layers consist of a first layer, a second layer and a third layer.

The groundwater distribution layer (12, 12 ') of the first layer is made of concrete with soil concrete composition so that one side compressive strength is 2kg / cm ³ or more and permeability coefficient is 10 ^-4 cm / sec or more. The layer thickness is preferably 0.3-0.4m.

The groundwater outflow freezing prevention layer (13,13 ') of the second layer was concreted by using the soil concrete composition on the groundwater distribution layer after the groundwater distribution layer (12,12') was solidified. One side compressive strength should be more than 5kg / cm ² and permeability coefficient 10 ^-8 cm / sec or more to cure concrete.

The layer thickness is preferably 0.2-0.3 m.

The leachate complete shielding prevention layer 14 and 14 'of the third layer is a contact layer where household waste and various industrial wastes are in contact with each other, and is a surface layer that completely shields and protects leachate generated from the household waste or its waste.

The leachate barrier layer (14,14 ') is constructed after the second layer of groundwater leakage freeze prevention layer (13,13') is concrete cured and cured with concrete, compressive strength 10kg / cm ² Or more (cement compressive strength of 200kg / cm ² or more) and permeability coefficient of 10 ^-10 cm / sec or more.

In addition, when the landfill has a soft ground, there is a fear that cracks may occur due to landfill subsidence and vibration on the ground, as shown in FIGS. 2 and 5. It is cured by concrete construction.

Furthermore, in order to efficiently collect the leachate generated from the household waste and various wastes as shown in FIGS. 3 and 4, the leachate complete shielding prevention layer 14 of the third layer is inclined at a constant inclination θ. Also, one or more bones (cross section is semicircular) (leached water inflow passage) (a) for collecting and collecting the leached water in one place are constituted.

The leachate forms semicircular grooves 16, which are collected through the valleys a, at the connecting surface of the bottom surface and the bottom of the third layer.

In this case, the inclination θ is preferably about 5%, and it is preferable to form a plurality of radial valleys (debt-shape of the fan) around the groove 16.

The leachate collected in the semicircular groove 16 is treated by separate treatment means.

This valley (a) can be similarly applied not only to the leachate complete shielding waterproofing layer 14 of the third layer, but also to the front surface 14 '.

In this valley, the gravel of the appropriate size is stored to help the leachate flow due to waste obstruction.

As for the total thickness of the 1st-3rd layer which carried out the concrete-hardening by the construction process, 0.6-1.0m is preferable.

Therefore, the construction procedure effectively processed by this invention is as follows.

As shown in Fig. 1, 1. ① ②: The concrete surface curing 12 'and the bottom plate 12 of the groundwater distribution layer 12, 12' of the first layer are concretely cured, and then,

2. ③④: The concrete 13 'and the bottom 13 of the groundwater freeze prevention layer (13,13') of the second floor are constructed and cured into concrete. Finally, ⑤⑥: The leachate of the third floor is completely completed. The surface 14 'and the bottom 14 of the anti-shielding waterproofing layers 14 and 14' are constructed to perform concrete curing.

4. In FIG. 5, when constructing the soft ground, construct the third floor of ②④⑥ and install the soft soil storage pillars 15 to prevent vibration and cracking of the load.

In this way, the leachate can be completely waterproofed.

Example

a) Preparation of soil concrete composition (coastal zone)

20 liters of water was injected into a water tank and 1 cc of the soil concrete mixture was mixed.

Then, the mineral powder was mixed and stirred, and the mixture obtained above was sprayed onto 1 m ³ of the soil mixture (soil + cement) previously mixed using a liquid spraying device, and mixed and stirred with heavy equipment such as remiton.

In this way, the soil concrete composition was obtained.

b) construction of landfills;

Landfill sites were selected for coastal land (drying up to 20% soil moisture content).

0.3m thickness of groundwater distribution layer (12,12 ') of the first layer, 0.3m thickness of the groundwater leakage freeze protection layer (13,13') of the second layer, leachate complete shielding prevention surface layer (14,14 ') of the third layer ) Constructed by following the construction process as shown in the construction procedure ① ~ ⑥ of the above using the above-mentioned soil concrete composition so that the total thickness of 1m to 1m thick.

At this time, the slope of the leachate complete shielding prevention layer 14 of the third layer was inclined to 5%, and the leachate inflow passage (bone) (cross section is semicircular) (a) was radially collected and collected in one place. The recess 16 was configured.

At this time, gravel of appropriate size was laid for smooth flow of waste obstructed leachate.

In addition, as a result of investigating the site of the landfill, the ground was soft, and thus, the crack preventing column 15 due to vibration and load was formed as shown in FIGS. 2 and 5.

Compressive strength and permeability coefficient for each layer are as follows.

1st layer (12,12 '): One side compressive strength 2kg / cm ² _a

Permeability 10 ^-4 kg / cm ²

2nd layer (13,13 '): Uniaxial compressive strength 5kg / cm ²

Permeability Factor 10^-8cm / sec

3rd layer (14,14 '): uniaxial compressive strength 10kg / cm ² (cement compressive strength 200kg / cm ² or more)

Permeability coefficient 10 ^-10 cm / sec (complete waterproof)

The present invention can block the groundwater inflow of leachate and prevent soil contamination, and can effectively construct the leachate by completely treating the ground such as landfills with the soil concrete composition.

It can also make the construction and use of structures on soft ground easier.

Since the soft ground can be effectively constructed by the composition of the present invention, the construction of landfill and agricultural waterway ground construction, landfill construction of living and industrial waste, ground construction of airfield runways and highways and general roads, ground construction of railways and subways, underground storage Ground works for tank facilities, ground works for ground drainage, ground and periphery and dike construction of rivers, shore reclamation works, ground works for golf and playgrounds, road walks, recycling works for landfills, solid waste, rivers and It can be used for solidification of sea sediment, ground reclamation work, soil building construction, and ground safety reinforcement facilities of bridge work.

Claims (6)

Raw MgO and gypsum powder 2-5wt% of minerals, local soil (mountain soil or coastal soil) 80wt%, quicklime 2-5wt%, cement 10-15wt%, transparent waterproofing and urine 1-2wt%, soil Soil concrete composition for soft ground treatment of household waste and industrial waste landfill, characterized in that the concrete mixture is composed of 1-2wt%, water 1-2wt%. The method of claim 1, The soil concrete mixture is potassium chloride 0.05-0.35wt%, calcium chloride 0.03-0.25wt%, magnesium chloride 0.03-0.20wt%, sodium chloride 0.03-0.20wt%, cobalt chloride 0.0002-0.01wt%, silicic acid 0.0002-0.01wt%, Soil sulfate 0.001-0.02wt% The composition of the soil concrete composition characterized in that it is used. In the soft ground civil engineering work and soft ground treatment construction method of household waste and industrial waste landfill, soil concrete composition is used to remove the surface and bottom of groundwater distribution layer (12, 12 ') of the first layer in the suspended landfill. Curing the concrete to a thickness of 0.3-0.4 m; Next, install the surface and bottom of the groundwater outflow freeze protection layer (13, 13 ') of the second layer to concretely cure to a thickness of 0.2-0.3m, and then to prevent the total shielding of the leachate of the third layer. The surface and bottom of the surface layer (14,14 ') are constructed and concrete cured to a thickness of 0.1-0.3m to make the total concrete cured layer 0.6-1.0m so that the leachate is completely waterproof. Soft ground treatment construction method. The method of claim 3, wherein If the bottom of groundwater distribution layer (12, 12 ') of the first floor has soft ground, the soft ground is subjected to vibration and load to prevent cracking due to the load and vibration of civil works and its household waste and industrial waste. Constructed in the shape of a column for preventing cracks 15 to cure concrete, and the leachate complete shielding waterproofing layer 14 of the third layer is a leachate recovery means, and the leachate is cured at the same time as the waterproof layer 14 is inclined. Semicircular grooves, which are composed of a plurality of leachate inflow passages (bones) having a semicircular cross section on the completely shielded waterproofing surface layer (14) and which collect gravel with a certain size of gravel on the valleys. 16) Soft ground treatment construction method characterized in that the construction to constitute. The method of claim 3, wherein Soil concrete composition consists of 2 ~ 5wt% of raw MgO and gypsum powder, 80wt% of local soil (mountain soil or coastal soil), 2-5wt% of quicklime, 10-15wt% of cement, transparent waterproof solution and urine 1-2wT% , Soil concrete mixture (potassium chloride 0.05-0.35wt%, calcium chloride 0.03-0.25wt%, magnesium chloride 0.03-0.20wt%, sodium chloride 0.03-0.20wt%, cobalt chloride 0.0002-0.01wt%, silicic acid 0.0002-0.01wt%, Sodium sulfate 0.0001-0.02wt%) 1-2wt%, 1-2wt% of water, soft ground treatment method characterized in that it is used. Construction of agricultural and agricultural waterways, construction of landfills for household waste and industrial waste, construction of airfield runways and highways and general roads, construction of railways and subways, construction of underground storage tank facilities, waterproofing of underground storage tank facilities, construction of underground drainage facilities, river floors And surrounding cleanup and embankment construction, construction of coastal landfill site, ground construction of golf course and playground, solid waste, river and sea sediment solidification and riverbed reclamation work, road sidewalk construction, waste landfill recycling, solid waste, river and sea sediment A method of using the soil concrete composition according to claim 1, which is used in any one of solidification and reclamation work of a riverbed, manufacture of soil building materials, and ground work of a safety reinforcement facility of a bridge.