KR101911830B1 - A cement concrete pavement composite including functions of waterproof and anti-corrosive and cement concrete pavement method using the composite - Google Patents

Abstract

The present invention proposes a cement concrete pavement composition including waterproof and anti-corrosive functions and a monolithic exposed cement concrete pavement method using the composition. The composition for cement concrete pavement comprises a cement binder, fine aggregate, coarse aggregate and water, and 2.0 to 3.4 parts by weight of a cement binder, 3.4 to 4.8 parts by weight of fine aggregate, and 5.7 to 7.1 parts by weight of a coarse aggregate are contained on the basis of 1 parts by weight of water. The monolithic exposed cement concrete pavement method using the composition for cement concrete pavement composition is composed of a preliminary preparation step, a depositing step, a planarization step, a surface treatment step, and a curing agent application step.

Description

Technical Field [0001] The present invention relates to a composition for cement concrete pavement having waterproofing and rustproofing properties, and a method for packaging a single-unit exposed cement concrete using the composition,

The present invention relates to a composition for cement concrete pavement, and more particularly to a waterproof and rustproofing material having strength and crack resistance suitable for repeated traffic loads and satisfying both rust resistance, salt penetration resistance, freezing and thaw resistance, scaling resistance and abrasion resistance The present invention relates to a composition for cement concrete pavement and a packaging method for unified exposure cement concrete using the composition.

Generally, road pavement can be divided into two types, asphalt pavement and cement concrete pavement. The asphalt pavement method is a method of forming a pavement layer by installing asphalt concrete (ASCON) mixed with asphalt and concrete. It has good workability, low initial investment cost, and excellent flatness. However, it is disadvantageous in that it is required to repackage periodically in order to prevent the inconvenience due to plastic deformation and surface deterioration from being ensured, thereby causing excessive traffic management cost as well as excessive maintenance cost. Particularly, when the asphalt is installed on the upper surface of the existing concrete, there is a disadvantage that the packing layer may be separated or eliminated due to the combination of different heterogeneous materials.

The concrete pavement method is advantageous in that it is economical because it uses Portland cement as the whole thickness of the pavement, and is excellent in workability because it is low in material cost. On the other hand, there is a disadvantage that concrete cracks easily occur due to repeated vibration . In addition, since the permeability is high, it is difficult to prevent the corrosion of the reinforcing bar due to penetration of harmful chemicals such as chloride from the upper part, which causes economic loss.

As described above, in order to effectively prevent the penetration of chloride or moisture which directly affects the durability of the concrete, it is required in the latex modified concrete (LMC) pavement method and the cross-pavement pavement, in which synthetic rubber latex resin (SBR) A surface coating material such as a VES-LMC method, an HPC method, a PCMC method, a self-healing type modified latex concrete or the like is proposed and used. This method uses a method of packing 2 ~ 3 ~ 7 cm thickness of existing concrete on the concrete, but it shows excellent adhesion performance in the laboratory, but as a result of applying to the actual site, the temperature of the bottom of the road in summer is high, As the stability of the resin is lowered, there is a disadvantage that frequent problems of initial plastic shrinkage cracking and lack of adhesion with the floor concrete occur frequently due to the change of the hardening film formation time of the silicone modified latex.

From the viewpoint of flatness and running noise, general cement concrete pavement can be made to make the longitudinal grooves in the road (selected from the pavement or exposed side) to maintain the running and comfort, but the exposed cement concrete pavement has micro cement , Silica fume, quick - speed cement, etc. To improve the physical properties such as watertightness. It has a disadvantage that it does not satisfy chloride ion penetration resistance and complex durability performance requirements.

Since the exposed cement concrete pavement is a part directly conveying the traffic load, it is necessary to have strength and crack resistance suitable for repeated traffic loads. Considering that it is exposed to moisture such as rainwater, it is also effective to prevent corrosion of the reinforcing steel due to securing the waterproof performance of the concrete itself and penetration of chloride ion, resistance to salt penetration, freezing and thawing resistance, scaling resistance, abrasion resistance And so on.

Korean Patent No. 10-1619288 (May 02, 2016)

It is an object of the present invention to provide a waterproof coating composition which is capable of imparting durability such as salt permeability, freezing and thaw resistance, scaling resistance, crack resistance and abrasion resistance, self-healing function and waterproof performance, The present invention provides a cement concrete pavement composition having waterproofing and anticorrosive properties, which can significantly shorten the life span and maintenance cost of cement concrete pavement with improved shrinkage resistance.

Another technical problem to be solved by the present invention is to provide a cement concrete pavement composition having a waterproof and rust-inhibiting function by a two-step method using a single layer type concrete pavement And a method of packaging the exposed cement concrete.

In order to accomplish the above object, according to the present invention, there is provided a cement concrete paving composition having a waterproof and rustproofing function, which comprises cement binder, fine aggregate, coarse aggregate and water, wherein 2.0 to 3.4 parts by weight 3.4 to 4.8 parts by weight of fine aggregate, and 5.7 to 7.1 parts by weight of coarse aggregate. Wherein the cement binder contains 7.5 to 8.25 parts by weight of Portland cement, 2.5 to 3.175 parts by weight of blast furnace slag, 0.125 to 0.625 parts by weight of silica fume, 0.0375 to 0.125 parts by weight of chemical admixture, and 0.1625 to 0.125 parts by weight of chemical admixture, 0.5 part by weight.

According to another aspect of the present invention, there is provided a method of packaging an unified exposure cement concrete using a composition for cement concrete paving according to the present invention, which comprises performing a preliminary preparation step, a pouring step, a planarization step, a surface treatment step and a curing agent application step. In the preliminary preparation step, water is sprayed onto the auxiliary layer or the upper part of the form to keep the paved floor in a wet state. In the pouring step, the composition for cement concrete paving as set forth in claim 1 is placed on the floor of the auxiliary equipment layer or the upper surface of the workpiece, that is, the wetted floor surface. In the planarizing step, the surface of the composition for cement concrete paving installed in the pouring step is planarized. In the surface treatment step, the exposed pavement surface planarized in the planarizing step forms vertical (or horizontal) grooves in the direction of travel of the road or horizontally. In the curing agent application step, the curing agent is applied to the surface of the surface treated in the surface treatment step.

The integrated unvulcanized cement concrete pavement according to the present invention improves the durability limit due to the salt penetration resistance against excessive use of calcium chloride in winter and the freezing and thaw resistance and scaling resistance, crack resistance and abrasion resistance due to moisture absorption of concrete, The effect of extending the life of the concrete pavement can be greatly reduced and the maintenance cost can be greatly reduced. When fine cracks occur on the exposed concrete pavement surface, the precipitate of the pozzolanic substance among the inorganic cement binders and the waterproof composition reaction generate self- healing microcrystal particles, It can be expected to improve durability by reducing the reduction of physical performance due to water or chloride penetration and recovery performance of damaged area. It is also possible to provide various durability-related characteristics such as securing waterproof performance of concrete itself and salt- Satisfied Cement concrete monolithic exposed cement concrete pavement construction method using concrete paving composition can achieve the effect of preventing the construction of a resource-saving and environment pollution.

1 shows the composition of a cement concrete paving composition having a waterproof and rustproof function according to the present invention.
FIG. 2 is a workflow diagram of a method of packaging an unified impregnated cement concrete using the composition according to the present invention.
3 is a photograph of a waterproof composition undergoing a mock-up test to confirm self-healing properties.

In order to fully understand the present invention and the operational advantages of the present invention and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings, which are provided for explaining exemplary embodiments of the present invention, and the contents of the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

1 shows the composition of a cement concrete paving composition having a waterproof and rustproof function according to the present invention.

1, a composition for cement concrete pavement 100 (hereinafter, referred to as a composition for cement concrete pavement) having a waterproof and rustproofing function according to the present invention comprises 2.0 to 3.4 parts by weight of cement binder, 3.4 to 4.8 parts by weight of fine aggregate And 5.7 to 7.1 parts by weight of coarse aggregate.

The aggregate can be classified into a fine aggregate and a coarse aggregate. In the following description, it is assumed that the aggregate having a particle diameter of 5 mm or less is called a fine aggregate and the aggregate is a coarse aggregate having a diameter of 5 mm to 25 mm.

Wherein the cement binder is a mixture of 7.5 to 8.25 parts by weight of Portland cement, 2.5 to 3.175 parts by weight of blast furnace slag, 0.125 to 0.625 parts by weight of silica fume, 0.0375 to 0.125 parts by weight of chemical admixture and 0.1625 to 0.5 By weight.

In the present invention, it is proposed to use one or a combination of Portland cement (one kind, two kinds, three kinds, five kinds), blast furnace slag cement, fly ash cement and silica cement.

The blast furnace slag has a specific surface area of 4,000 cm 2 / g to 5,500 cm 2 / g, which is obtained by rapidly cooling the molten slag produced together with the pig iron in a blast furnace at about 1500 ° C. and then milling the glass- The blast furnace slag is latent hydraulic and has a property of being hardened by itself but hardened by the stimulation of alkali. When blast furnace slag is mixed with ordinary Portland cement, hardening can be promoted by the action of calcium hydroxide or sulfate. Due to the latent hydraulic properties of blast furnace slag, it is usually used in binders of Portland cement to improve permeability, long-term strength development and durability.

The fly ash has a specific surface area of 3,000 cm 2 / g to 4,500 cm 2 / g, which is a fine powder as a by-product produced at a rate of about 15% to 45% of the raw coal when the pulverized coal as a fuel of a thermal power plant is burned at a high temperature of 1400 ° C. to 1500 ° C. It refers to ash collected by dust collector. Fly ash belongs to the artificial pozzolan and has no hydraulic property itself, but the silica component slowly reacts with calcium hydroxide, the hydration product of lime and cement, at a room temperature to generate a stable insoluble compound and cure. Therefore, there is a long-term strength, durability, and self-healing property of a cement-based material to fill a minute crack.

Silica fume is an ultrafine particle by-product that is produced by floating silicon oxide such as silicon or ferrosilicon in exhaust gas when it has a specific surface area of 150,000 cm 2 / g to 300,000 cm 2 / g. The main component is amorphous It is silica. The silica fume typically has a specific gravity of about 2.2 and a particle size of about 1 탆 or less on the average of about 0.1 탆 and improves the mechanical performance and chemical resistance of the concrete because of its high pozzolanic reaction and large specific surface area.

The chemical admixture is used to improve resistance to workability and freezing and thawing by carrying a high performance water reducing agent used to improve the strength and durability of the composition by reducing the water-cement mixing ratio of the composition and a myriad of fine air pockets independent of the concrete It is suggested to use AE which is air entraining agent. The high performance water reducing agent includes at least one of a naphthalenesulfonate type, a melamine formalin resin sulfonate type and a polycarboxylic acid type, and the AE agent includes at least one of a resin type, an alkylbenzenesulfonic acid type, a high alcohol fatty acid ester type and a non- do.

The powder waterproofing material is one of the important characteristics required in exposed cement concrete, that is, resistance to cracks caused by repetitive passive vibration and plastic shrinkage, ability to heal naturally by precipitates formed in pozzolanic materials, and waterproofing performance , And includes a high fatty acid metal salt, a lignin sulfonate surfactant, and a re-oil type powder resin. The powdery waterproofing material may further include calcium nitrite or sodium nitrite as the positive electrode type inorganic salt to further improve the antirust performance to prevent corrosion of the reinforcing steel.

The powdery waterproofing material can be divided into waterproofing and waterproofing and anti-rusting. For waterproofing, 1 part by weight of a re-oiling type powder resin including a styrene-acrylic copolymer polymer is mixed with 5.4 to 8.2 parts by weight of high fatty acid type zinc stearate, 0.17 to 1.31 parts by weight of a high fatty acid-based zinc stearate, 0.1 to 3 parts by weight of a higher fatty acid-based stearic acid surfactant, And 0.9 to 1.35 parts by weight of a re-firing powder resin containing a phenol-acryl-co-polymer.

Although not shown in Fig. 1, it is preferable to use a redispersible powder resin for waterproofing and rustproofing, in which a styrene-acrylic copolymer polymer and sodium nitrite or calcium nitrite are mixed at a weight ratio of 1: 6.

The higher fatty acid metal salt is preferably composed of at least one material selected from zinc stearate, calcium stearate, ammonium stearate, calcium oleate, aluminum oleate and butyl stearate.

When a water-repellent agent such as a melamine-based or naphthalene-based surfactant is used in a powdery waterproofing composition, the surfactant is not compatible with a concrete material, and slump is remarkably reduced to deteriorate workability. In order to solve this problem, the present invention uses a lignin sulphonate-based surfactant which is compatible with the chemical admixture and improves the dispersibility of the cement, thereby lowering the water binding ratio and improving the workability with appropriate fluidity .

The re-oiling type powder resin is preferably made of at least one material selected from a vinyl acetate monopolymerized polymer, a vinyl acetate / ethylene copolymerized polymer, a styrene-acrylic copolymerized polymer, and an ethylene / vinyl laurate / vinyl chloride tritiated polymer.

FIG. 2 is a workflow diagram of a method of packaging an unified impregnated cement concrete using the composition according to the present invention.

Referring to FIG. 2, a method 200 for packaging an integrated exposed cement concrete using a composition according to the present invention comprises a preliminary preparation step 210, a pouring step 220, Step 230, surface treatment step 240 and curing agent application step 250 are performed.

In the preliminary preparation step 210, water is sprayed on the auxiliary layer or the upper part of the form to keep the paved floor in a wet state. First, generally, soil and non body are formed by using soil. Then, a primer coating (Prime Coating), which is a waterproof layer, is constructed on the completion of the frost protection layer and the auxiliary layer by using the crushed stone. In the concrete unified exposure cement concrete pavement method, Wet the surface of the layer or the upper surface of the bridge slab to wet condition before applying.

In the casting step 220, a composition for cement concrete paving having the structure shown in FIG. 1 is placed in a wetted floor surface (an auxiliary layer or an upper part of the formwork) through the preparation step 210. The composition for cement concrete pavement is poured in a certain thickness on an auxiliary layer or an upper part of the formwork, taking into consideration the thickness to be laid using a batcher mixer or a mobile mixer.

In the planarizing step 230, the pavement surface laid by the composition for cement concrete paving may be flattened. At least one of screed, roller tube, and roller paper may be used for planarization.

In the surface treatment step 240, grooves in a certain direction are formed on the planarized exposed packaging surface. For example, surface treatment is performed to form grooves in the vertical or horizontal direction with respect to the traveling direction of the road. The surface treatment can be realized by increasing the running noise and drainage of the vehicle after planarization and forming longitudinal grooves by tinning or grooving on exposed cement concrete surface to prevent water film phenomenon and slip.

In the curing agent application step 250, the curing agent is applied so that the surface treated road pavement surface is less affected by the temperature change. The concrete curing by applying the curing agent after the surface treatment depends on the installation amount of the cement concrete pavement composition, the weather, etc. However, it is generally preferable to perform the wet curing for 48 to 72 hours and the curing for 3 to 10 days Do.

Table 1 shows three examples and comparative examples of cement concrete paving compositions according to the present invention.

division Example 1 Example 2 Example 3 Comparative Example Portland cement 60 62 66 64 Blast furnace slag 25.4 23 20 25 Fly ash 8 8 8 8 Silica fume 5 3.4 One 2 Chemical admixture 0.3 0.6 One One Powder waterproofing material Waterproof 1.3 2 4 - rust - One - -

Referring to FIG. 1, the mixing ratio of the fine aggregate, the coarse aggregate, the water, and the cementitious binder is the same in the three kinds of Examples and Comparative Examples, and therefore, the description thereof will not be repeated.

Referring to Table 1, the composition 100 for cement concrete pavement according to the present invention can be divided into Examples 1 and 3 that perform only waterproof functions and Example 2 that performs waterproof and antirust functions. The composition ratio of the unused comparative example is also known.

Of the compositions for cement concrete pavement according to the present invention, Examples 1 and 3, which are waterproof only, were prepared by mixing Portland cement, blast furnace slag, fly ash, silica fume, chemical admixture and powder waterproofing material as cement binders at a weight ratio of 60: 25.4 1: 1: 4 by weight of Portland cement, blast furnace slag, fly ash, silica fume, chemical admixture and powder waterproofing material as a cement binder at a weight ratio of 8: 5: 0.3: .

Example 2 including a waterproof and rust-inhibiting function is a mixture of Portland cement, blast furnace slag, fly ash, silica fume, chemical admixture and powder waterproofing material in a weight ratio of 62: 23: 8: 3.4: 0.6: 3 as a cement binder. Here, the powder waterproofing material is a mixture of waterproofing material 2 and rustproofing material 1 in a weight ratio.

The comparative example shows that the composition of the portland cement, the blast furnace slag and the silica fume was adjusted instead of using the powdery waterproofing material in Example 1.

The composition ratios described in the following description all mean a weight ratio.

division Example 1 Example 2 Example 3 Comparative Example Salt penetration resistance (Coulomb) 954 913 927 1,131

Table 2 shows the result of performing the salt penetration resistance test according to the method specified in ASTM C 1202 " Electrical Indication of Concrete Ability to Resist Chloride Ion Penetration "according to the blending ratios shown in the three examples and the comparative examples. It is estimated that the measured amount of passing charge is higher than 4,000 Coulombs, it is usually in the range of 2,000 to 4,000 coulons, low in 1,000 to 2,000 coulombs, and very low in 100 to 1,000 coulombs. Performance of less than 1,000 coulombs is required. Referring to Table 2, it can be seen that the salt penetration resistance of the three examples is lower than that of the comparative example.

Table 3 shows the relative resistance values of the test specimens for 300 cycles with the method A of KS F 2456 "Test method for resistance of concrete to rapid freezing and thawing " according to the mixing ratios shown in the three examples and the comparative examples. And the results are shown in the comparative test with elastic modulus.

division Example 1 Example 2 Example 3 Comparative Example Freeze-thaw resistance (%) 83.0 83.2 82.8 75.5

As shown in Table 3, the relative freeze-thaw resistance measured in the test is required to be 80% or more for the unified cement concrete pavement. In the case of the comparative example not including the powder waterproofing material, It can be seen that all embodiments pass this criterion.

Table 4 shows the results of performing a scaling (peeling) resistance test according to SS 13 72 44 "Peeling Resistance Test in Freezing " according to the compounding ratios shown in the three Examples and Comparative Examples.

division Example 1 Example 2 Example 3 Comparative Example Scaling Resistance Kg / ㎡ 0.41 0.38 0.37 0.85 m ₅₆ / m ₂₈ 1.85 1.83 1.86 2.05

The average peel amount (m ₅₆ ) after 56 cycles estimated in the test is 1.0 kg / m 2, and at the same time the m ₅₆ / m ₂₈ is less than 2, and the peel resistance is Acceptable grade, which is required in the integrated cement concrete pavement Performance. Table 4 shows that the compositions for cement concrete pavement according to the three examples have lower peel resistance than those of the comparative examples, and the peel resistance of the concrete pavement surface due to freezing and thawing in winter is high.

Table 5 shows the test results of the crack resistance test of concrete according to AASHTO PP 34-99 "Standard Method of Test for Estimating the Cracking Tendency of Concrete" according to the blending ratios shown in the Examples and Comparative Examples.

division Example 1 Example 2 Example 3 Comparative Example Crack resistance No cracking No cracking No cracking Constraint Dry shrinkage crack Yes

Proceeding according to this test method procedure, proceeding with visual observation without attaching strain gauge, and observation of occurrence of cracks in aged 56 days at constant temperature and humidity room. As shown in Table 5, the compositions for cement concrete pavement prepared according to the three examples did not cause cracking, but it was confirmed that the comparative example caused constrained drying shrinkage cracks.

Table 6 shows the results of performing the concrete wear resistance test according to the method specified in ASTM C 779 " Standard Test Method for Abrasion Resistance of Horizontal Concrete Surfaces "according to the blending ratios shown in the three examples and the comparative examples.

division Example 1 Example 2 Example 3 Comparative Example Abrasion Resistance (mm) 0.67 0.52 0.62 1.23

After the test piece is fixed, the abrasive depth is measured by rotating the abrasive blade for 30 minutes while the abrasive blade is in contact with the surface of the concrete. In the unified exposure cement concrete pavement, the performance of 2.0 mm or less at 28 days is required. Referring to Table 6, it can be seen that the composition for cement concrete pavement according to the three examples has a lower wear depth than that of the comparative example and shows high resistance to abrasion.

Table 7 shows the results of the concrete compressive strength test according to the method specified in KS F 2405 "Test method for compressive strength of concrete" according to the mixing ratios shown in the three examples and the comparative examples.

division Example 1 Example 2 Example 3 Comparative Example Compressive strength
(MPa) 28 days old 32.9 34.2 35.4 31.5 56 days a year 41.3 39.6 41.2 39.4

The test specimens were prepared in three sets each with a slump of 130 ± 25 mm and an air quantity of 6.5 ± 1.5%, respectively, and tested at the age of 28 and at the age of 56. In case of unified exposure cement concrete pavement, performance of 30 MPa or more at 28 days is required. Table 7 shows that the compositions for cement concrete pavement according to the three examples show higher compressive strength than the comparative examples.

Table 8 shows the results of conducting a length change test by concrete drying shrinkage according to the method specified in KS F 2424 "Method for testing length change of mortar and concrete" according to the mixing ratios shown in the three examples and the comparative examples.

division Example 1 Example 2 Example 3 Comparative Example Dry shrinkage (%) -0.0452 -0.0438 -0.0412 -0.0632

Three test specimens were prepared and tested on the 14th day of age. In case of integrated pavement cement concrete pavement, performance of less than 0.15 on the age of 14 days is required. Referring to Table 8, it was confirmed that the composition for cement concrete pavement prepared according to the three examples showed a somewhat similar composition shrinkage (rate of change in length) to the composition according to the comparative example.

Table 9 shows the results of performing an absorption resistance performance test according to the method specified in KS F 4926 "water-tight admixture for concrete" according to the mixing ratios shown in the three examples and the comparative examples.

division Example 1 Example 2 Example 3 Comparative Example Water absorption coefficient ratio 0.55 0.50 0.48 1.0

The specimens of the comparative examples were used as reference values and tested in a manner of comparing with the specimens of the three examples. Five sets of test specimens were prepared, and the maximum and minimum test specimens were discarded, and the average of the remaining three specimens was determined. Water-based admixtures for concrete require performance of 0.7 or less on the 28th day of age. As shown in Table 9, mortar except for coarse aggregate was prepared as a sample in the composition for cement concrete pavement prepared according to the three examples, and the water absorption coefficient ratio was measured. As a result, it can be confirmed that the absorption resistance is high.

Table 10 shows the results of carrying out the water permeability test according to the method specified in KS F 4926 "water-tight admixture for concrete" according to the mixing ratios shown in the three examples and the comparative examples.

division Example 1 Example 2 Example 3 Comparative Example Pitch ratio 0.53 0.48 0.45 1.0

The specimens of the comparative examples were used as reference values and the specimens of the three examples were compared with the comparative method. Five sets of test specimens were prepared, and the maximum and minimum test specimens were discarded, and the average of the remaining three specimens was determined. Water-based admixtures for concrete require performance of 0.7 or less on the 28th day of age.

Referring to Table 10, mortar except for coarse aggregate was prepared as a specimen in the composition for cement concrete pavement manufactured according to the three examples, and the permeability ratio was measured to confirm that the permeability was high.

Table 11 shows that the rust-inhibitive performance improving agent was not added to the concrete compositions of Examples 1, 3, and Comparative Example, while the cement concrete composition prepared using the rust-inhibitive performance-improving agent for preventing rebar corrosion was KS F 2561 "Rustproofing agent for reinforced concrete" This shows the results of performing a rust-proof performance test according to the corrosion promotion test method for reinforcing steel in concrete.

division Example 1 Example 2 Example 3 Comparative Example Rust prevention rate (%) 39.8 96.2 42.5 25.6

Referring to Table 11, it was confirmed that the composition of Example 2, which was prepared by using the anticorrosion performance improving agent in Examples 1 and 3, which did not use the anticorrosion performance improving agent, exhibited a higher anticorrosion rate to prevent corrosion of the reinforcing steel .

The reaction between the alumina component contained in the pozzolanic substance and the gypsum contained in the cement, among the inorganic cement binders contained in the composition for cement concrete pavement used in the present invention, resulted in the formation of the precipitate in which the acicular crystals of the ettringite were actively formed and the water- It reacts with water and prevents harmful ion movement and is filled in microcracks and healed. Therefore, durability is improved by reducing the physical performance of the concrete surface, preventing water and chloride ion penetration, and improving the recovery performance against the damaged area. Water is essential for the natural healing process, and the four mechanisms are as follows.

1) Moisture and harmful ion movement disturbance by reaction of waterproofing composition

2) Calcium carbonate precipitation by reacting calcium ion (Ca ²⁺ ) and carbonate (CO ₃ ^2- ) of calcium hydroxide (Ca (OH) ² )

₃₎ SiO 3 ² which activity is eluted from a strong component of SiO _2, Al ₂ O ₃ in the chemical composition contains a pozzolanic ^{substance-insoluble} compound by reaction with the calcium ions (Ca ^{2 +) -} or AL ^₂ O _{4 2} Calcium silicate production.

3 is a photograph of a waterproof composition undergoing a mock-up test to confirm self-healing properties.

4) When the pozzolanic substance and the waterproofing composition remaining in the cracked section are in contact with water for a long time, the self-healing properties of filling the minute cracks within 0.4 mm due to rehydration of unreacted materials are as shown in FIG. 3 The healing performance can be confirmed by the mock test.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

210: Preparatory step
220: Step of casting
230: planarization step
240: Surface treatment step
250: Curing agent application step

Claims (4)

With respect to 1 part by weight of water,
2.0 to 3.4 parts by weight of a cement binder;
3.4 to 4.8 parts by weight of fine aggregate; And
5.7 to 7.1 parts by weight of coarse aggregate; Lt; / RTI >
The cement-
For 1 part by weight of fly ash,
7.50 to 8.25 parts by weight of Portland cement;
2.5 to 3.175 parts by weight of blast furnace slag;
0.125 to 0.625 parts by weight of silica fume;
0.0375 to 0.125 parts by weight of chemical admixture; And
0.1625 ~ 0.5 part by weight of powdery waterproofing material; Lt; / RTI >
The powder water-
Resin type powdered resins including high fatty acid zinc stearate, lignin sulphonate surfactant and styrene-acrylic copolymer polymer are mixed in weight ratio of 0.87 to 1.31: 1: 0.9 to 1.35, respectively, ego,
In the waterproofing and rustproofing,
The re-
Wherein the styrene-acrylic copolymer polymer is mixed with sodium nitrite or calcium nitrite at a weight ratio of 1: 6. The chemical admixture according to claim 1,
A high performance water reducing agent comprising at least one of a naphthalene sulfonate type, a melamine formalin resin sulfonate type and a polycarboxylic acid type; And
A resin system, an alkylbenzenesulfonic acid system, a higher alcohol esterified ester system, and a nonionic system. delete A preliminary preparation step for spraying water on the auxiliary layer or the upper part of the formwork so as to keep the paved floor in a wet state;
A pouring step of placing the composition for cement concrete paving according to claim 1 on the floor of the auxiliary equipment layer or the upper surface of the workpiece, that is, the wetted floor surface;
A planarizing step of flattening the surface of the cement concrete paving composition placed in the pouring step;
A surface treatment step of forming a planarized exposed packaging surface in a longitudinal direction (or a transverse direction) in a vertical direction or a horizontal direction in a traveling direction of the road; And
A curing agent application step of applying a curing agent to the packaging surface surface-treated in the surface treatment step; To
The method of claim 1,

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