KR102160579B1 - Composition for hardening - Google Patents

Abstract

The present invention provides a composition for hardening which contains, based on 100 parts by weight of the composition, 0.1 to 1 part by weight of sodium silicate (Na_2SiO_3), 0.1 to 1 part by weight of calcium carbonate (CaCO_3), 0.1 to 1 part by weight of aluminum oxide (Al_2O_3), 2 to 4 parts by weight of silica fume (SiO_2), 10 to 25 parts by weight of potassium hydroxide (KOH), 10 to 30 parts by weight of magnesium chloride, 10 to 30 parts by weight of sodium chloride, 10 to 25 parts by weight of potassium chloride, 10 to 25 parts by weight of calcium chloride, 1 to 10 parts by weight of sodium sulfate, 1 to 10 parts by weight of sodium tripolyphosphate, 1 to 5 parts by weight of lignin sulfonate, and 1 to 10 wt% of metakaolin. In addition, the present invention is to provide a body of hardening which contains at least one mixture selected from a group consisting of cement, soil, industrial waste, marine sand, and desert sand, and the composition for hardening according to claim 1. A hardener composition of the present invention provides an effect of hardening soil, industrial waste, marine sand, and desert sand to have fast hardening speed, excellent strength, and excellent elasticity. In addition, a body of hardening composition containing the hardener composition, soil, industrial waste, marine sand, and desert sand, etc., has fast hardening speed, excellent strength, and excellent elasticity, thereby being able to be economically useful for construction and civil engineering.

Description

Composition for hardening {Composition for hardening}

The present invention relates to a curing composition and a cured body composition comprising the same.

In recent years, the construction period is delayed due to the difficulty of securing high-quality construction materials when performing civil works and construction projects, and it acts as a factor to increase expenses, and by developing masonry or collecting aggregate from rivers and seas to secure construction materials. There are problems that damage the natural environment and disturb the ecosystem.

Specifically, the existing harbor reclamation method and the existing asphalt and concrete paving method use granular materials such as stone, so the fields are damaged for quarrying, and quarrying, transporting, and breaking work are factors that increase the construction cost.

In order to solve the above problems, there is a need for a plan to recycle soil, industrial waste, river dredging sludge, marine sand, desert sand, etc., which are widely distributed throughout Korea as a substitute for stone in various civil works and other construction projects.

As such a method, cement stabilization and LAC (Lignin Rosin Asphalt Concrete) methods have been developed and utilized, but it is difficult to obtain early compressive strength due to a long finishing curing time, and compressive strength is also less than 30kgf/㎠ The application was very low because the field that could be used was limited to the auxiliary base material of road construction.

An object of the present invention is to provide a curing agent composition capable of curing soil, waste, marine sand, and desert sand to have a fast curing speed, excellent strength, and excellent elasticity.

In addition, the present invention includes the curing agent composition and soil, industrial waste, maritime sand, desert sand, etc., and it is an object of the present invention to provide a cured body composition that can be economically used in construction and civil engineering due to fast curing speed, excellent strength and excellent durability. To do.

Another object of the present invention is to provide a road pavement construction method using a curing agent composition.

The present invention is sodium silicate (Na ₂ SiO ₃ ) 0.1 to 1 parts by weight, calcium carbonate (CaCO ₃ ) 0.1 to 1 parts by weight, aluminum oxide (Al ₂ O ₃ ) 0.1 to 1 parts by weight, silica fume (SiO ₂ ) 2 ~4 parts by weight, potassium hydroxide (KOH) 10 to 25 parts by weight, magnesium chloride 10 to 30 parts by weight, sodium chloride 10 to 30 parts by weight, potassium chloride 10 to 25 parts by weight, calcium chloride 10 to 25 parts by weight, sodium sulfate 1 to 10 parts by weight Parts, sodium tripolyphosphate 1 to 10 parts by weight, lignin sulfonate 1 to 5 parts by weight, and a composition for curing comprising 1 to 10% by weight of metakaolin.

The present invention is characterized in to provide a cured body comprising at least one mixture selected from the group consisting of cement, soil, industrial waste, marine sand and desert sand, and the curing composition according to claim 1.

In addition, the curing composition is characterized in that 0.05 to 0.1 parts by weight based on 100 parts by weight of one or more mixtures selected from the group consisting of cement, soil, industrial waste, marine sand and desert sand.

On the other hand, in the hardened body, the cement is characterized in that 5 to 10 parts by weight based on 100 parts by weight of one or more mixtures selected from the group consisting of the soil, industrial waste, marine sand, and desert sand.

In addition, the soil is characterized in that it is a mixture of at least one selected from the group consisting of granite soil, mud soil, river sand, sea sand, and natural soil.

On the other hand, the present invention is the curing composition; At least one mixture selected from the group consisting of soil, industrial waste, marine sand, and desert sand; And it provides a method of manufacturing a hardened body containing cement.

The present invention comprises the steps of determining the thickness of soil and sand, preparing equipment, and obtaining an appropriate mixing ratio and an optimum water content (OMC) through a preliminary indoor test;

Stirring the soil 2 to 4 times using a rotary mixer or a stabilizer so that the soil and sand are well mixed with cement, followed by laying;

The step of evenly laying cement to a certain thickness on the road to be constructed on the soil by using equipment such as an asphalt finisher;

A step of preparing a solution by mixing the curing composition of claim 1 with water; (The standard mixing ratio is to dissolve 10 kilograms of PMX per 200 liters of water, but the amount is adjusted in consideration of the optimum water content of soil (14%).)

Spraying the water and the curing composition mixture solution evenly on the road where soil and cement are mixed;

Mixing the soil and cement mixture evenly 2 to 3 times using a rotary mixer or a stabilizer so that the mixture solution of the soil and cement mixture and water and the curing composition are evenly mixed;

Arranging the pavement surface to be constructed using a motor grader equipment;

Compacting 3 to 4 times using a tire roller (8 tons to 15 tons);

Compacting 3 to 5 times using a vibrating roller (8 to 10 tons);

Step of finishing compaction 1 to 2 times using a tire roller; And

It characterized in that it provides the on-site stirring construction method comprising a; step of paving the surface layer after curing.

On the other hand, determining the thickness of the soil and sand pavement, preparing equipment, and obtaining an appropriate mixing ratio and an optimum water content (OMC) through a pre-indoor test;

Adding the soil and cement to the soil mixer and then sufficiently mixing it;

Putting the mixed and dissolved solution of claim 1 with water in a soil mixer, and mixing evenly so as to be about 2-3% higher than the optimum water content ratio until sufficiently mixed with soil and cement;

Laying the mixture of the soil, cement, and hardened composition solution on a road with an even thickness using an asphalt finisher;

Arranging the road pavement using a motor grader device;

Compacting 3-4 times using a tire roller (8 tons to 15 tons);

Compacting 3-4 times using a vibrating roller (8-10 tons);

Completion of 1 to 2 times using a tire roller (TIRE ROLLER);

It characterized in that it provides a dry pre-stirring construction method comprising a; step of paving the surface layer after curing.

On the other hand, determining the thickness of the soil and sand pavement, preparing the equipment, and obtaining an appropriate mixing ratio and an optimum water content (OMC) through a preliminary indoor test;

Adding the soil and cement to the soil mixer and then sufficiently mixing it;

Putting the mixed and dissolved solution of claim 1 with water in a soil mixer, and then mixing evenly so that the water content is 25-30% until sufficiently mixed with soil and cement;

Installing a form (FORM) with a height of 150% or more of the construction thickness with wood or the like so that the mixture does not overflow along the road;

Placing on the road surface a material capable of blocking drainage, such as a vinyl mat, if necessary in consideration of the characteristics of the road or the soil quality;

Paving the soil, cement, and hardener composition solution mixture on a road with an even thickness using a leveling finisher;

Removing the formwork after the packaging is cured

It characterized in that it provides a wet pre-stirring construction method comprising a; step of paving the surface layer after curing.

The curing agent composition of the present invention provides an effect of curing soil, waste, marine sand, and desert sand to have a fast curing speed, excellent strength, and excellent elasticity.

In addition, since the curing agent composition and the cured body composition including soil, industrial waste, marine sand, desert sand, etc. have a fast curing speed, excellent strength, and excellent durability, they can be economically used in construction and civil engineering.

Hereinafter, the present invention will be described with reference to preferred embodiments.

The present invention is based on 100 parts by weight of the composition sodium silicate (Na ₂ SiO ₃ ) 0.1 to 1 parts by weight, calcium carbonate (CaCO ₃ ) 0.1 to 1 parts by weight, aluminum oxide (Al ₂ O ₃ ) 0.1 to 1 parts by weight, silica 2 to 4 parts by weight of fume (SiO ₂ ), 10 to 25 parts by weight of potassium hydroxide (KOH), 10 to 30 parts by weight of magnesium chloride, 10 to 30 parts by weight of sodium chloride, 10 to 25 parts by weight of potassium chloride, 10 to 25 parts by weight of calcium chloride , 1 to 10 parts by weight of sodium sulfate, 1 to 10 parts by weight of sodium tripolyphosphate, and 1 to 5 parts by weight of lignin sulfonate, and 1 to 10 parts by weight of metakaolin.

Sodium silicate (Na ₂ SiO ₃ ) plays a role of alkalinization as 0.1 to 1 parts by weight. If it is contained in an amount of less than 0.1 part by weight, it is difficult to obtain the desired effect, and if it exceeds 1 part by weight, the alkalinity is too high, which may cause a problem.

Calcium carbonate (CaCO ₃ ) is a calcium salt of carbonate and has the formula CaCO ₃ , and is the most common salt existing in nature. The shape is also various, and exists as marble, calcite, berth, limestone, chalk, ice tin, seashell, egg shell, coral, etc. In general, colorless crystals or white solids, specific gravity 293, decompose at 825 ℃. When heated, carbon dioxide is produced and quicklime is obtained. This reaction is an important reaction for industrially obtaining carbon dioxide and quicklime. In the present invention, it contains 0.1 to 1 parts by weight.

Aluminum oxide (Al ₂ O ₃ ) is also industrially referred to as alumina, and has a molecular weight of 101.96. Naturally, it is produced as a crystalline mineral, corundum, and there are also rubies and sapphires colored with pure corundum. It is known that it has various forms, and α-aluminum oxide, which is produced when aluminum hydroxide is heated to 300°C or less, is the purest and most stable form. In addition, there is aluminum oxide, which has poor crystallinity, resulting from dehydration of β-aluminum oxide hydrate containing a little alkali. Body image 1-aluminum oxide, and δ, ζ, η, θ, κ, x, ρ, etc. are also known. In the present invention, it contains 0.1 to 1 parts by weight.

Silica fume (SiO ₂ ) is a very fine pozzolanic material that is mainly produced as a by-product in the process of producing metallic silicon or silicon iron in an electric furnace, and is mostly composed of amorphous silicon. The physical properties of silica fume are known to have a spherical shape of about 90% or more, a particle diameter of 1 or less, an average particle diameter of 01, a specific surface area (BET) of about 20 m²/g, and a specific gravity of about 21 to 22. Silica fume is a by-product generated in the manufacture of metallic silicon or silicon alloy, its shape is spherical, and its chemical composition is almost SiO2. When this is added to concrete or the like, the viscosity increases and the slump decreases, so the combination of a high-performance water-reducing material is indispensable. When this is used, the structure of the hardened body is made more compact and high compressive strength is obtained. In the present invention, it contains 2 to 4 parts by weight.

Potassium hydroxide (KOH) is a colorless solid, KOH that dissolves by strong heat in water. Caustic is a common name. In addition to anhydrous salts, there are 1, 2 and tetrahydrates. For a long time, the causticization method of reacting potassium carbonate with lime oil was used and produced in large quantities, but now it is obtained by electrolysis of potassium chloride aqueous solution. As it is deliquescent, when placed in the air, it absorbs water and dissolves, absorbs carbon dioxide, and becomes potassium carbonate. The aqueous solution is alkaline. Its chemical properties are almost the same as sodium hydroxide, but it is more corrosive and has a stronger ability to absorb carbon dioxide than sodium hydroxide. Potassium carbonate is also used to absorb carbon dioxide in the laboratory because less precipitation occurs than sodium carbonate. In the present invention, it contains 10 to 25 parts by weight.

Magnesium chloride plays a role of condensation and connection between soft earth particles by reacting with water of cement and soft earth particles to produce ethrinzite (3CaO·Al ₂ O ₃ ·3CaSO ₄ ·32H ₂ O), a stable mineral with high moisture. . In the present invention, it contains 10 to 30 parts by weight of magnesium chloride.

Sodium chloride is colorless crystal, contains salts such as magnesium, and is deliquescent. As a raw material for producing sodium salt, it plays a role in accelerating the hydration reaction of cement. If contained in an amount of less than 1 part by weight, heat of hydration may not be smoothly accommodated with moisture, resulting in high heat of hydration, which may cause cracks in the hardened sphere. When contained in an amount of 3 parts by weight, strength is achieved by suppressing the smooth pozzolanic reaction of cement. May cause problems. In the present invention, it contains 10 to 30 parts by weight of sodium chloride.

Potassium chloride is a crystal belonging to the white tetragonal system, and is industrially used as a raw material for the manufacture of potassium salts and is used as a water reducing agent because of its strong water absorption properties. If it is contained in an amount of less than 10 parts by weight, it affects the air by slowing the curing speed and curing time of the cured product, and if it is contained in an amount of more than 25 parts by weight, it suppresses the smooth pozzolanic reaction of the cement and has a problem in realizing strength. In addition, the premature hardening of the hardened body can lead to a decrease in construction quality. It is contained in an amount of 15 to 28 parts by weight based on the total weight of the curing composition. In the present invention, it contains 10 to 25 parts by weight.

Calcium chloride acts as a catalyst and coagulant to promote absorption and prevent freezing by mixing with cement. If it is contained in an amount less than 10 parts by weight, there may be a problem that the freeze-preventing effect is weakened due to the lack of smooth acceptance with moisture. If it is contained in an amount exceeding 25 parts by weight, a large amount of anhydride is generated and the curing agent may meet with moisture. When it may be difficult to achieve a liquid phase, it is contained in an amount of 10 to 25 parts by weight based on the total weight of the curing composition.

Sodium sulfate is a relatively stable colorless crystal and is used in the manufacture of glass or sodium sulfide. In the cured product reaction, it is used for drying organic matter in soil. If it is contained in an amount less than 1 part by weight, it may not be able to sufficiently perform the smooth hydration (pozzolan reaction) of the cement, and there may be a problem in strength. If it is contained in an amount of more than 10 parts by weight, it is helpful to improve the hydration function. Since it increases product cost, it is contained in an amount of 1 to 10 parts by weight based on the total weight of the curing composition.

Sodium triphosphate is a white crystalline powder and has been used as a single product in the civil engineering field as a cement aid and soft ground improver. As a deliquescent solid, it has the property of blocking metal ions and acts as a coagulant. If it is contained in an amount less than 1 part by weight, the overall strength of the cured product may be a problem, and if it is contained in an amount more than 10 parts by weight, it lacks economical efficiency and becomes an environmental factor. Therefore, the total weight of the curing composition It is contained in an amount of 1 to 10 parts by weight.

Sodium lignosulfonate plays a role in reducing and dispersing mixtures such as soil, industrial waste, river dredging sludge, marine sand, desert sand, and cement, and increases strength by combining cement and mixture. If it is contained in an amount of less than 1 part by weight, there may be a problem of inhibiting particle dispersion and lowering the strength after completion of the material. If it is contained in an amount of more than 5 parts by weight, it is a three-dimensional network structure due to the nature of the material. There may be a problem that inhibits the chemical reaction.

Metakaolin increases the initial strength of concrete by generating ettringite and activating C ₃ S in cement due to its high reaction rate, and pozzolanic reaction with calcium hydroxide of cement makes the pores between particles dense, resulting in strength and durability. Increase Metakaolin is preferably 1 to 10% by weight.

As the cement, any cement known in the field of construction may be used without limitation. For example, Portland cement, which is most commonly used, can be used.

The curing composition of the present invention may be used for curing at least one selected from the group consisting of soil, industrial waste, marine sand, and desert sand, but is not limited thereto.

It is preferably used in an amount of 3 to 15 parts by weight based on 100 parts by weight of at least one selected from the group consisting of the soil, industrial waste, marine sand, and desert sand. When it is contained in less than 3 parts by weight, it is difficult to achieve the objective effect, and when it exceeds 15 parts by weight, it is not economically preferable.

The soil may be granite soil, mud soil, river sand, sea sand, natural soil, etc., but is not limited thereto.

The industrial waste may be sludge, residue, volcanic ash, environmental waste, slag, powder slag, waste concrete, sludge, etc., but is not limited thereto.

The present invention is also a cured body composition comprising 100 parts by weight of at least one selected from the group consisting of soil, industrial waste, marine sand, and desert sand and 3-15 parts by weight of a curing composition.

The hardened composition may be used as a landfill material for a harbor hinterland, a container yard composition, a road base material, a road auxiliary base material, a core wall construction material of a river embankment and a soil dam, or a soft ground improvement material, but is not limited thereto.

The cured body composition can be used as a building material, a civil engineering material, etc. as a substitute for a stone, and it is economical and environmentally friendly because it can use the on-site generated soil.

Hereinafter, the present invention will be described in more detail through examples. However, the following examples are for explaining the present invention more specifically, and the scope of the present invention is not limited by the following examples. The following examples can be appropriately modified and changed by those skilled in the art within the scope of the present invention.

Example 1: Preparation of curing composition

Based on 100 parts by weight of the total composition, sodium silicate (Na ₂ SiO ₃ ) 0.1 to 1 parts by weight, calcium carbonate (CaCO ₃ ) 0.1 to 1 parts by weight, aluminum oxide (Al ₂ O ₃ ) 0.1 to 1 parts by weight, silica fume ( SiO ₂ ) 2 to 4 parts by weight, potassium hydroxide (KOH) 10 to 25 parts by weight, magnesium chloride 10 to 30 parts by weight, sodium chloride 10 to 30 parts by weight, potassium chloride 10 to 25 parts by weight, calcium chloride 10 to 25 parts by weight, sodium sulfate A curing composition comprising 1 to 10 parts by weight, 1 to 10 parts by weight of sodium tripolyphosphate, and 1 to 5 parts by weight of lignin sulfonate was prepared.

Examples 2 to 4 and Comparative Example 1: Preparation of cured body

The cured product of Example 2-4 was prepared using the curing composition of Example 1, and the cured product of Comparative Example 1 was prepared using only cement. The composition ratio of each cured product composition was shown in Table 1 below.

The cured composition of Examples 2-4 and Comparative Example 1 was put into a cylindrical mold having a diameter of 30 cm and a height of 60 cm, and cured through water immersion for 7 days. After the curing period was over, the mold was separated to complete the cured body.

Example 2 Example 3 Example 4 Comparative Example 1 Curing composition Example 1 15 15 15 cement - - - 15 Earth and sand, industrial waste Granite 100 - - 100 Slag - 100 - - Maritime - - 100 -

(Unit: parts by weight)

Test Example 1: Evaluation of physical properties of the cured product

After curing each of the cured articles prepared in Examples 2 to 4 and Comparative Example 1 for 7 and 28 days, the compressive strength of the cured article was measured using a tester according to KS F 2405.

The load was made so that the increase in compressive stress was 2~3 kgf/cm2 every second, and after the hardened body started to rapidly deform, stop adjusting the speed of applying the load and continue applying the load to measure the uniaxial compressive strength, and the results are as follows. It is shown in Table 2.

Uniaxial compressive strength (kgf/㎠) 7 days curing 28 days curing Comparative Example 1 Granite 37.93 78.51 Example 2 Granite 51.67 90.34 Example 3 Slag 41.31 67.14 Example 4 Maritime 40.21 65.28

As can be seen from the test results in Table 2, the cured articles of Examples 2 to 4 using the curing composition of the present invention exhibited very excellent compressive strength. On the other hand, the hardened body of Comparative Example 1 using only Portland cement showed very deteriorated compressive strength compared to the hardened body of Example 2. Therefore, the curing agent composition and the cured body composition including soil, industrial waste, marine sand, desert sand, etc. have a fast curing speed, excellent strength, and excellent durability, and thus can be economically used in construction and civil engineering.

Hereinafter, when the soil cement method is used as a soil stability construction, soil cement pavement (selective layer, auxiliary base layer and base layer pavement) construction by adding the curing composition of the present invention for its quality improvement and economy In the following, the construction method applied for mixing, laying, compaction, etc. will be described.

Road pavement construction method using soil cement hardening composition

1) Material

Remove foreign substances such as gravel, soil lumps, tree branches, vinyl, etc. over Ø 100 mm in the soil In the case of soil with a plasticity index (PI) of 20 or higher and a liquid limit (LL) of 40 or higher, special attention should be paid to agitation such as mixing with other soils or pre-drying. Determine the water content of soil and calculate the optimum water content through an indoor test.

Cement uses Portland cement for structural purposes. In principle, drinking water should be used, but if it is unavoidable, general water or sea water may be used under the command of a site supervisor. However, it should not contain excessive substances that affect the quality of the base layer, such as oil, acid, salt, and organic matter.

The curing composition ('PMX') and cement must be covered with vinyl and tents so that they do not come into contact with moisture such as rainfall, and the floor must be loaded and stored at a height of about 10 to 20 cm from the ground. The opened curing composition ('PMX') and cement should be thoroughly wrapped with vinyl or the like after use to prevent hardening. The hardened curing composition ('PMX') is pulverized using a grinder and then dissolved in water for use.

If the minimum temperature is below 5℃, construction should not be performed, and roads constructed for at least 7 days after construction should not be below 0℃. In case of rainfall, the work should not be performed unless the supervisor (manager) has approved it. When constructing the anti-frost layer (blocking layer), sub-base, and base layer using the soil cement method, the contents are reflected in the design . In this case, the thickness of each layer is determined according to the site situation and reflected in the design, but the standard thickness is shown in the table below.

Road type Layer thickness First class road 40 Cm or more Second class road 30 Cm 3rd class road 20 Cm

The base layer and the auxiliary base layer of the existing construction method are integrated and constructed as one layer, and the case of the frostbite prevention layer (blocking layer) is decided according to the site situation. Class 1 roads are high-speed national highways and general national highways with high traffic. Class 2 roads are classified into general national roads, and level 3 roads are divided into local roads and other roads, but the details are based on the government road design standards. Layer thickness refers to the thickness after compaction.

As with the existing road pavement, the earthwork (road) must be completed, and construction must be initiated after confirming that the preliminary work related to adjacent drainage facilities and structures has been completed. In particular, after carefully checking the condition of the roadbed, that is, the degree of compaction (compact density) and the condition of the earthwork, such as the condition of soft ground and subsidence, take necessary measures. The construction method is decided according to the type of road and the characteristics of the site. There are two methods of construction: on-site stirring method and pre-agitation method (dry/wet).

2) Determination of mixing ratio and water content

The mixing ratio and optimum water content of cement, soil and PMX are determined through a preliminary indoor test by collecting soil from the site. In principle, the site soil collection and experiment should be conducted once every 500m ³ , but the supervisor can adjust the collection and interval according to the site situation. The standard mixing ratio for each type of soil is shown in Table 5-1 below. The standard water content is 14% to 16%, but the optimum water content is obtained through an indoor experiment according to the type of soil and site conditions.

*Standard mixing ratio by soil

Sediment classification Cement amount (%) PMX amount
(%) AASHTO USCS A-1-a GW, GP, GM, SW, SP, SM 6


1% of the amount of cement A-1-b GM, GP, SM, SP 7 A-2 GM, GC, SM, SC 7 A-3 SP 8 A-4 CL, ML 9 A-5 ML, MH, CH 10 A-6 CL, CH 11 A-7 MH, CH 12

* The amount of cement is% of the maximum dry weight of soil.

3) On-site stirring method

Determine the thickness of the soil and sand pavement, prepare the equipment, and obtain the appropriate mixing ratio and optimal water content (OMC) through a preliminary indoor test.

The thickness of soil and sand at the site is 120% of the thickness to be constructed. Foreign matter in the soil to be constructed and large (normally 10cm in diameter) stones and soil mass are picked out.

Cement is evenly laid on the soil by using equipment or personnel such as an asphalt finisher. Stir 2~4 times using a rotary mixer or a stabilizer so that the on-site soil is well mixed with cement. However, if the road surface is hardened a lot, first dig up the soil to the required thickness using equipment, and then crush it so that it can be stirred well. The soil to be filled is installed on the road to be constructed with a certain thickness.

Mix and dissolve water and a curing composition in a sprinkler truck (SPRINKLER TRUCK). The standard mixing ratio is to dissolve 10 kilograms of the curing composition per 200 liters of water, but the amount is adjusted in consideration of the optimum water content (14%) of soil. The sprinkler truck must be a vehicle that can control the amount of solution sprayed per hour (adjusts the amount of additional water in consideration of the existing water content of the site soil).

The mixed solution of water and PMX is evenly sprayed on the road where soil and cement are mixed. In the same manner as in Item 7, mix the soil and cement mixture and the hardening composition solution 2 to 3 times using a rotary mixer or stabilizer so that the mixture is evenly mixed.

Use the motor grader equipment to arrange the pavement surface to be constructed.

Compact 3 to 4 times using a tire roller (8 tons to 15 tons).

Compact 3~5 times using a vibrating roller (8~10 tons).

When it is judged that the compaction has been completed to some extent, finish compaction once or twice using a tire roller. Corners and corners that cannot be compacted with rollers are compacted with manpower or compact.

The compaction thickness of one layer should be within 20cm, and if the compaction thickness is more than that, it is divided into two or more compactions. All compaction work must be completed within 4 hours of mixing the soil and cement. For curing, it is recommended to spray enough water on the pavement surface for 3 days after construction (in case of rain, it is not necessary to sprinkle it naturally), and pedestrians or vehicles should not be allowed to enter during the curing period. Surface packaging work is carried out 7 days after compaction work.

* Type of resolution

promise RAMMER MOLD inner diameter The number of layers of compaction Number of compactions per floor Allowable maximum particle diameter A 2.5 Kg 10 Cm 3 25 19 mm B 2.5 Kg 15 Cm 3 55 37.5 mm C 4.5 Kg 10 Cm 5 25 19 mm D 4.5 Kg 15 Cm 5 55 19 mm E 4.5 Kg 15 Cm 3 92 37.5 mm

4) Pre-stirring method (dry)

Determine the thickness of the soil and prepare the equipment. Calculate the appropriate mixing ratio and the optimum water content (OMC) through a preliminary indoor experiment. (The preliminary indoor test is conducted in accordance with KS F 2312 soil compaction test.)

After deciding whether to stir or need to be filled with on-site soil, determine the amount of soil to be filled in the case of only on-site soil construction, and transport to a soil mixer. The plant should be a facility that is easy to move, and in principle, it should be installed within about 2km of the road construction site, but it is installed in consideration of the transportation environment, and the plant is moved according to the progress of the construction site.

Before putting the soil into the soil mixer, pick out foreign matter, large stones, and soil (diameter 5 cm or more) in the soil.

After adding the soil and cement to the soil mixer, mix well.

After mixing the water and the curing composition and dissolving the solution, put it in a soil mixer and mix evenly until it is sufficiently mixed with soil and cement. The standard mixing ratio of the solution is to dissolve 10 kilograms of the curing composition per 200 liters of water, but the amount is adjusted in consideration of the optimum water content of soil.

The water content is mixed so that it is about 2~3% higher than the optimal water content ratio in consideration of evaporation during transport and installation. Using an asphalt finisher, the soil, cement and hardening composition solution mixture of Item 6 is laid on a road with even thickness. In this case, the laying thickness shall be at the level of 120% of the compaction thickness.

Use the motor grader equipment to clean the road pavement.

Compact 3-4 times using a tire roller (8 tons to 15 tons).

Compact 3-4 times using a vibrating roller (8-10 tons).

When it is judged that the compaction has been completed to some extent, finish compaction once or twice using a tire roller. Corners and corners that cannot be compacted with a roller are compacted with manpower or compact.

If the thickness of one compaction is less than 20cm, if the thickness of compaction is more than that, it should be divided into two or more times. All compaction work must be completed within 4 hours of mixing the soil and cement.

For curing, it is recommended to spray enough water on the pavement surface for 2 to 3 days after construction, and do not walk or enter vehicles during the curing period (about 7 days before and after).

Surface packaging work is carried out 7 days after compaction work. However, the period can be adjusted at the discretion of the supervisor in consideration of the road surface condition.

5) Pre-stirring method (wet)

In special circumstances, such as when compaction using rollers is not possible, use wet construction. Determine the thickness of the soil and prepare the equipment.

After deciding whether to stir or fill with on-site soil, determine the amount of soil to be filled when working with only on-site soil and transport to a soil mixer (or plant).

Before putting the soil into the soil mixer, pick out foreign substances, large stones, and soil (diameter 5cm or more) in the soil.

After adding the soil and cement to the soil mixer, mix well.

After mixing and dissolving water and the curing composition of the present invention into a soil mixer, the mixture is evenly mixed until sufficiently mixed with soil and cement. The standard mixing ratio of the solution is to dissolve 10 kg of the curing composition per 200 liters of water, but the amount is adjusted in consideration of the optimum water content of soil.

The water content is mixed so that it becomes thick (about 25-30%) like concrete.

Install a form with wood, etc. to prevent the mixture from overflowing along the road. At this time, the height of the formwork should be at least 150% of the construction thickness.

Considering the characteristics of the road and the soil, if necessary, a material that can block drainage such as a vinyl mat should be laid on the road surface.

Using a leveling finisher, the soil, cement and hardening composition solution mixture of item 6 above is laid on the road to an even thickness. After the pavement has been cured to some extent, remove the formwork.

For curing, do not walk or enter a vehicle during the curing period (about 7 days). The surface paving work is carried out 7 days after the compaction work. However, the period may be adjusted at the discretion of the supervisor in consideration of the road surface condition.

Claims (9)

delete delete delete delete delete delete Determining the thickness of the soil and sand pavement, preparing equipment, and obtaining an appropriate mixing ratio and water content through a preliminary indoor test;
Agitating the soil 4 times using a rotary mixer or a stabilizer (STABILIZER) so that the soil is well mixed with the cement and then laying it;
The step of evenly laying cement to a certain thickness on the road to be constructed on the soil by using equipment such as an asphalt finisher;
Making a solution by mixing the curing composition with water,
Here, the curing composition is sodium silicate (Na ₂ SiO ₃ ) 0.1 to 1 parts by weight, calcium carbonate (CaCO ₃ ) 0.1 to 1 parts by weight, aluminum oxide (Al ₂ O ₃ ) 0.1 to 1 parts by weight based on 100 parts by weight of the composition Parts, silica fume (SiO ₂ ) 2 to 4 parts by weight, potassium hydroxide (KOH) 10 to 25 parts by weight, magnesium chloride 10 to 30 parts by weight, sodium chloride 10 to 30 parts by weight, potassium chloride 10 to 25 parts by weight, calcium chloride 10 to It is a composition for curing comprising 25 parts by weight, 1 to 10 parts by weight of sodium sulfate, 1 to 10 parts by weight of sodium tripolyphosphate, 1 to 5 parts by weight of lignin sulfonate, and 1 to 10 parts by weight of metakaolin;
Spraying the water and the curing composition mixture solution evenly on the road where soil and cement are mixed;
Mixing the soil, cement mixture, water, and the curing composition mixture 3 times using a rotary mixer or a stabilizer so that the mixture solution is evenly mixed;
Arranging the pavement surface to be constructed using a motor grader equipment;
Compacting four times using a tire roller;
Compacting four times using a vibrating roller;
Step of finalizing two times using a tire roller (TIRE ROLLER); And
Curing the pavement surface for 3 days after construction, and then performing surface pavement 7 days after the compaction operation; On-site stirring construction method comprising a. Determining the thickness of the soil and sand pavement, preparing equipment, and obtaining an appropriate mixing ratio and water content through a preliminary indoor test;
Adding the soil and cement to the soil mixer and then sufficiently mixing it;
Mixing and dissolving water and the curing composition into a soil mixer, and mixing evenly at a water content of 14-16% until sufficiently mixed with soil and cement,
Here, the curing composition is sodium silicate (Na ₂ SiO ₃ ) 0.1 to 1 parts by weight, calcium carbonate (CaCO ₃ ) 0.1 to 1 parts by weight, aluminum oxide (Al ₂ O ₃ ) 0.1 to 1 parts by weight based on 100 parts by weight of the composition Parts, silica fume (SiO ₂ ) 2 to 4 parts by weight, potassium hydroxide (KOH) 10 to 25 parts by weight, magnesium chloride 10 to 30 parts by weight, sodium chloride 10 to 30 parts by weight, potassium chloride 10 to 25 parts by weight, calcium chloride 10 to It is a composition for curing comprising 25 parts by weight, 1 to 10 parts by weight of sodium sulfate, 1 to 10 parts by weight of sodium tripolyphosphate, 1 to 5 parts by weight of lignin sulfonate, and 1 to 10 parts by weight of metakaolin;
Laying the mixture of the soil, cement and hardened composition solution on the road with an even thickness of 120% of the compaction thickness using an asphalt finisher;
Arranging the road pavement using a motor grader device;
Compacting four times using a tire roller;
Compacting four times using a vibrating roller;
Step of finalizing two times using a tire roller (TIRE ROLLER); And
Dry pre-stirring construction method comprising; curing the pavement surface for 3 days after construction, and then performing the surface layer paving 7 days after the compaction operation. Determining the thickness of the soil and sand pavement, preparing equipment, and obtaining an appropriate mixing ratio and water content through a preliminary indoor test;
Adding the soil and cement to the soil mixer and then sufficiently mixing it;
Mixing and dissolving water and hardening composition into a soil mixer, and then mixing evenly so that the water content is 25-30% until sufficiently mixed with soil and cement,
Here, the curing composition is sodium silicate (Na ₂ SiO ₃ ) 0.1 to 1 parts by weight, calcium carbonate (CaCO ₃ ) 0.1 to 1 parts by weight, aluminum oxide (Al ₂ O ₃ ) 0.1 to 1 parts by weight based on 100 parts by weight of the composition Parts, silica fume (SiO ₂ ) 2 to 4 parts by weight, potassium hydroxide (KOH) 10 to 25 parts by weight, magnesium chloride 10 to 30 parts by weight, sodium chloride 10 to 30 parts by weight, potassium chloride 10 to 25 parts by weight, calcium chloride 10 to It is a composition for curing comprising 25 parts by weight, 1 to 10 parts by weight of sodium sulfate, 1 to 10 parts by weight of sodium tripolyphosphate, 1 to 5 parts by weight of lignin sulfonate, and 1 to 10 parts by weight of metakaolin;
Installing a form (FORM) at a height of 150% or more of the construction thickness so that the mixture does not overflow along the road;
Applying a material capable of blocking drainage, such as a vinyl mat, on the road surface in consideration of the characteristics of the road or the soil quality;
Paving the soil, cement, and hardener composition solution mixture on a road with an even thickness using a leveling finisher;
Removing the formwork after the packaging is cured; And
Wet pre-stirring construction method comprising; curing the pavement surface for 3 days after construction, and then performing surface layer pavement 7 days after the compaction operation.