KR101911824B1 - Initial Reaction Control Type Concrete Pavement Composition and Pavement Method Using the Concrete - Google Patents

Abstract

The present invention relates to technology for concrete road pavement, and more specifically, to a rapid-hardening ceramic binder composition capable of controlling an initial reaction, which effectively inhibits heat of an initial reaction to enable mass-production and mass-construction and have excellent bonding strength and permeation resistance to salts as well as compressive strength and bending strength, thereby being able to be advantageously used as a binder for a concrete road pavement material; a concrete road pavement material preferably including the composition; and a method for concrete road pavement preferably using the road pavement material. According to the present invention, the rapid-hardening ceramic binder composition capable of controlling an initial reaction comprises: 15-45 parts by weight of phosphate; 1-10 parts by weight of sodium metaphosphate (NaPO_3)_6; 1-10 parts by weight of borate; 10-40 parts by weight of an extender; 0.5-7 parts by weight of urea (CO(NH_2)_2; and 0.3-4 parts by weight of alkali salt, based on 100 parts by weight of water-repellent magnesia wherein the water-repellent magnesia is generated by mixing 100 parts by weight of magnesia with 0.5-5 parts by weight of a water-repellent agent and grinding the mixture in a grinder to have 1,500-3,000 g/cm^2cm^2 of fineness in a mixed state.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete pavement method and a concrete pavement method,

The present invention relates to a concrete road pavement technology, and more particularly, to a concrete road pavement technology which effectively suppresses the initial reaction heat to enable mass production and mass construction, and exhibits excellent performance in terms of bond strength and salt penetration resistance as well as compressive strength and bending strength, The present invention relates to an initial reaction-controlled ultra-light ceramic binder composition which can be advantageously used as a refractory binder, a concrete road pavement material preferably containing the same, and a concrete road pavement method using the road pavement material.

Cement is used in many kinds of construction and industrial fields due to its economical and excellent physical properties. However, it has relatively low initial strength, wintertime construction restriction, volume change (plastic shrinkage, autogenous shrinkage and drying shrinkage) And weak chemical resistance.

Phosphate based ceramics binders can replace cement. Prior art patents related to phosphate-based ultra-rapid ceramic binders include Published Applications 10-2009-0093612, Registered Patent No. 10-1187409, and Registered Patent No. 10-1339584. Phosphate based ceramics binders have very good initial strength compared to cement and have no limitations for winter construction and do not involve volume change during curing process. It is also excellent in sulfates and chemical resistance because C3A is not vulnerable to sulfate. However, the conventional ginseng base ceramics ceramics binder has a disadvantage in that the water resistance is poor in the initial curing step, and since it uses dead burned magnesia raw materials and phosphates at a temperature of 1500 ° C or higher, there is a limit in price. If the raw material of the magnet is not underconsumed, it reacts rapidly with stirring with water, so it is difficult to ensure appropriate working time and sufficient reaction can not be induced.

As a technique for improving the disadvantages of the conventional phosphate based ultra rapid ceramic binder, there are the registered patent No. 10-1580991 and the registered patent No. 10-1580989. The binders proposed in these patents are characterized in that the magnesia is mixed and pulverized together with the hydrophobic water repellent agent so that the surface of the magnesia is dispersedly coated with a water repellent agent, and phosphate, sodium metaphosphate, borate, and an extender are appropriately prepared. When such a binder is used, it exhibits excellent performance in terms of water resistance, freeze-thaw resistance and chlorine ion penetration resistance, as well as compressive strength and adhesion strength, and exhibits excellent strength characteristics without a significant delay in curing time, particularly at low temperatures. However, in case of production of 1 to 3 m < 3 > or more, the temperature rise is large due to a strong exothermic reaction, which further promotes the reaction, thereby making it difficult to ensure appropriate working time and securing fluidity at a level that can be applied on site. As a result, it is difficult to mass-produce and mass-install, and thus it is limited to be used for paving concrete roads.

Korean Patent No. 10-1580991 Korean Patent No. 10-1580989

The present invention has been developed to improve the disadvantages of the conventional rapid ceramic binder and is capable of effectively suppressing the initial reaction heat to enable mass production and large-scale construction, and exhibits excellent performance in terms of the bonding strength and the salt permeation resistance as well as the compressive strength and bending strength, There is a technical problem in providing an initial reaction-controlled ultra-rapid ceramic binder composition which can be advantageously used as a binder for road paving materials.

Also, the present invention provides a concrete road paving material suitably blended with an initial reaction-controlled ultra-rapid ceramic binder composition, and a concrete road pavement method or a concrete pavement repairing method using the pavement material.

(KH ₂ PO ₄ ), sodium dihydrogenphosphate (NaH ₂ PO ₄ ), ammonium dihydrogenphosphate ((NH ₄ ) 2), and the like are added to 100 parts by weight of water repellent magnesia. ₂ HPO ₄ ) and ammonium dihydrogen phosphate (NH ₄ H ₂ PO ₄ ); Sodium metaphosphate (NaPO ₃ ) ₆ 1 to 10 parts by weight; 1 to 10 parts by weight of a borate selected from boric acid (H ₃ BO ₃ ) and borax (Na ₂ B ₄ O ₇ · 10H ₂ O); 10 to 40 parts by weight of an extender selected from at least one of a pozzolana powder and a mineral powder; 0.5 to 7 parts by weight of urea (CO (NH ₂ ) ₂ ); 0.3 to 4 parts by weight of an alkali salt, wherein the water repellent magnesia is prepared by mixing 100 parts by weight of magnesia with 0.5 to 5 parts by weight of a water repellent agent in a pulverizer so as to have a powdery viscosity of 1500 to 3000 g / Wherein the initial reaction-controlled ultra-light ceramic binder composition has an initial reaction-controlled ultra-light ceramic binder composition.

In addition, the present invention relates to a method for preparing a concrete road pavement using the above-mentioned initial reaction-controlled ultra-rapid ceramic binder composition, wherein the binder (B) Fine aggregate ratio (S / a) of 45 to 55% by weight; Water binding ratio (W / B) of 20 to 24% by weight; Largest aggregate size 10 ~ 25mm; And a slump of 150 to 220 mm.

Further, the present invention is characterized in that the concrete road pavement material is laid on the base layer of the road, or the concrete road pavement method or the concrete pavement road is cleaned by removing the deteriorated portion of the concrete pavement surface, It provides a concrete road pavement maintenance method which is characterized by.

According to the present invention, the following effects can be expected.

First, since the ultra rapid ceramic binder and the concrete roadway pavement material according to the present invention can effectively suppress the initial reaction heat, it is possible to secure a proper working time, and mass production and mass construction are possible, which can be advantageously applied in the field. In addition to that, the initial strength can be secured early, so that the curing process can be omitted and it can be advantageously applied to emergency work. Therefore, the present invention can be utilized not only for repairing partial road pavement but also for pavement construction over the entire road.

Second, the ultra rapid ceramic binder and concrete road pavement according to the present invention exhibit excellent durability because they exhibit excellent performance in terms of compressive strength and bending strength, as well as bond strength and salt penetration resistance.

1 is a view showing a construction procedure of a concrete road pavement repairing method according to the present invention.

The present invention relates to a ultra rapid ceramic binder having a water-repellent magnesia and a phosphate as a binder, and is characterized in that it further comprises urea and an alkali salt so as to effectively suppress the initial reaction heat. As a result, the ultra rapid ceramic binder composition of the present invention can be mass-produced and mass-produced by securing a suitable working time.

Specifically, the initial reaction-controlled ultra-rapid ceramic binder composition according to the present invention is characterized in that 15 to 45 parts by weight of a phosphate is added to 100 parts by weight of water repellent magnesia; Sodium metaphosphate (NaPO ₃ ) ₆ 1 to 10 parts by weight; 1 to 10 parts by weight of a borate; 10 to 40 parts by weight of an extender; 0.5 to 7 parts by weight of urea (CO (NH ₂ ) ₂ ); And 0.3 to 4 parts by weight of an alkali salt.

In the present invention, the water repellent magnesia is prepared by mixing 0.5 to 5 parts by weight of water repellent with 100 parts by weight of magnesia in a pulverizer to obtain a powder having a particle size of 1500 to 3000 g / cm < 2 > In this case, the magnesia may be prepared in any one or more of MgO, MgO and CaO, but it is preferable that MgO + CaO is more than 97% by weight and MgO / CaO (weight ratio) is more than 2.5. Particularly, magnesia is suitable when firing magnesium carbonate (MgCO ₃ ) or dolomite (CaMg (CO ₃ ) ₂ ) in the range of 1100 to 1350 ° C and supplying it. When the firing temperature is 1100 ° C or less, If it is not cured, and it is over 1350 ℃, economical efficiency is lost. However, since the firing temperature at 1100 to 1200 ° C is somewhat low, it is advantageous to secure the firing time at least 3H or more (preferably 6H or more).

In water repellent magnesia, the water repellent agent suppresses the sudden reaction of magnesia through the manifestation of water repellent effect, and at least one of wax emulsion, calcium stearate, and aluminum stearate is selected and used. Among commonly used water repellent agents, stearic acid and oleic acid, which react with cement hydrate and exhibit a water repellent effect, are unsuitable.

Water repellent magnesia is prepared by mixing and pulverizing 100 parts by weight of magnesia with 0.5 to 5 parts by weight of a water repellent agent in a pulverizer (ball mill / vibrating mill or the like). If the water repellent agent is less than 0.5 part by weight, the water repellency effect is insufficient and it is difficult to secure a proper working time. If the water repellent agent is more than 5 parts by weight, it is difficult to induce the reaction with excessive water repellency. The water repellent agent is appropriately dispersed and coated on the surface of the magnesia according to the mixed pulverization, thereby maximizing the water repellent effect. The magnesia may be in the form of a pulverized fine powder as well as a pre-milled clinker. However, it is appropriate that the magnesia clinker has a particle size of 5 mm. If the particle size is too large, the efficiency of dispersing and coating the water repellent agent on the surface of the magnesia is lowered. The powder milling condition (milling time, method, pulverizing media, etc.) can be suitably adjusted so that the water repellency of the water repellent magnesia is in the range of 1500-3000 g / cm 2. If the powdering degree is too large, It is difficult to secure initial strength.

Zinnia light inde major material which is cured by hydration reaction with phosphate magnesia in the ceramic binder, 2 potassium dihydrogenphosphate (KH ₂ PO _4), dihydrogen phosphate, sodium (NaH ₂ PO _4), dibasic ammonium ((NH _{4) 2} HPO ₄ ) and ammonium dihydrogen phosphate (NH ₄ H ₂ PO ₄ ). These phosphates react with the magnesia in a hydration reaction as follows.

MgO + 2 (NH ₄ ) H ₂ PO ₄ + 3H ₂ O -> Mg (NH ₄ ) ₂ (HPO ₄ ) ₂ .4H ₂ O

MgO + (NH ₄ ) ₂ HPO ₄ + 5H ₂ O -> MgNH ₄ PO ₄ .6H ₂ O + NH ₃

MgO + KH ₂ PO ₄ + 5H ₂ O -> MgKPO ₄ .6H ₂ O

MgO + NaH ₂ PO ₄ + 5H ₂ O -> MgNaPO ₄ .6H ₂ O

It is preferable that 15 to 45 parts by weight of phosphate is used in the ultra rapid ceramic binder in 100 parts by weight of water repellent magnesia. When the amount of the phosphate is less than 15 parts by weight, an appropriate reaction can not be induced, so that high strength can not be secured at an early stage. If the amount is more than 45 parts by weight, heat generation is severe and the working time can not be secured. On the other hand, potassium dihydrogenphosphate and sodium dihydrogenphosphate in phosphates are good in reactivity but have a high heat generation. On the other hand, ammonium dihydrogenphosphate and ammonium dihydrogenphosphate have a characteristic that the generation of odor is generated due to the generation of ammonia gas. Accordingly, it is preferable to use a mixture of a first phosphate by at least one of potassium dihydrogenphosphate and sodium dihydrogen phosphate, and a second phosphate by at least one of ammonium dihydrogenphosphate and ammonium dihydrogenphosphate. However, in order to suppress excessive heat generation and to prevent odor generation, 70 to 90% by weight of the primary phosphate is preferably used. 10 to 30% by weight of a second phosphate;

Sodium metaphosphate (NaPO ₃ ) ₆ in ultra rapid ceramic binders suppresses heat generation in the reaction with magnesia, contributes to ensuring proper working time, and also contributes to the strength of the cured product. The sodium metaphosphate is preferably used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the water-repellent magnesia in an amount of 5% by weight or more based on the phosphate. If the amount of sodium metaphosphate used is too small, the effect of securing the working time is insignificant. If the amount is too much, the reaction delay effect is not further improved and the economical efficiency is lost.

Borate is a material that contributes to ensuring proper working time due to the delay of reaction in the ceramics binder. It is appropriate to select one or more of boric acid (Boric acid, H ₃ BO ₃ ) and borax (Borax, Na ₂ B ₄ O ₇ · 10H ₂ O). The borate is preferably used in an amount of 0.1 wt% or more of the phosphate in the range of 1 to 10 parts by weight based on 100 parts by weight of the water-repellent magnesia. If the borate is too small, the reaction delay effect does not exist. Is lost.

In the ceramics binders with a very high initial speed, the expanding agent becomes a filler for the increasing effect, and a pozzolan powder such as fly ash or meta kaolin, or a mineral powder such as a limestone fine powder is suitable. In particular, pozzolan powder is effective as a reactive extender, not only for increasing effect but also for improving strength after 1 day of age. The amount of the extender is preferably in the range of 10 to 40 parts by weight based on 100 parts by weight of the water-repellent magnesia.

Urea (CO (NH ₂ ) ₂ ) in the ultra rapid ceramic binder suppresses the rise of the reaction heat, thereby ensuring an appropriate working time, and also serves to improve dispersion and fluidity. The urea is preferably 0.5 to 7.0 parts by weight based on 100 parts by weight of the water-repellent magnesia. If the amount is too small, the effect is insignificant. If the amount is more than 7 parts by weight, the initial strength is greatly reduced.

Alkali salt (Alkali salt) in ultra fast ceramic binders plays a role in securing the working time and securing the fluidity by suppressing the acid environment and alleviating the hardening hardening. Potassium sulphate (K ₂ SO ₄ ) and sodium sulphate (Na ₂ SO ₄ ) are economical and effective. The alkali salt is preferably 0.3 to 4.0 parts by weight based on 100 parts by weight of the water repellent magnesia. If the amount is too small, the effect is insignificant. If the amount is more than 4 parts by weight, the initial curing is delayed and the strength performance is deteriorated.

Ceramic binder with the above-mentioned composition can be used as paste (mixed with water), mortar (mixed with fine aggregate, water), concrete (mixed with fine aggregate, coarse aggregate, water) However, in order to suitably use it as a concrete road pavement material for mass production and large-scale construction, the present invention is characterized in that it comprises 380 to 600 kg / m < 3 > Fine aggregate ratio (S / a) of 45 to 55% by weight; Water binding ratio (W / B) of 20 to 24% by weight; Largest aggregate size 10 ~ 25mm; It is suggested to formulate slump with 150 ~ 220mm; In the case of such a concrete road pavement material, it is difficult to obtain appropriate performance if the unit material amount is less than 380 kg / m 3, and the economic efficiency is lost if the unit material amount exceeds 600 kg / m 3. When the amount of fine aggregate (S / a) is less than 45% by weight, the amount of coarse aggregate is excessively large, resulting in poor workability and roughness on the surface. When the amount exceeds 55% by weight, excessive mixing water is required. When the water-binding ratio (W / B) is more than 20% by weight, it is difficult to secure workability. When the water-binding ratio is more than 24% by weight, The maximum size of coarse aggregate is usually in the range of aggregate, but a smaller size is suitable as far as improvement of workability is considered. When the slump is more than 150 mm, it is difficult to ensure quick workability. When the slump is more than 220 mm, the strength performance sharply drops due to an excessive amount of mixing.

The concrete road pavement material having the above composition is advantageously applied to the concrete road pavement method because it exhibits excellent performance in compressive strength, bending strength, adhesion strength, salt penetration resistance and length change as in the following [Test Examples 2 and 3] . Especially, it is possible to express the required strength very quickly (3hr), so that when the concrete pavement is re-packed or the existing pavement is repaired, the construction can be started within a few hours and the road can be opened quickly. Concrete new road pavement can be carried out by laying concrete pavement material on the road base like the usual way. The repair of existing concrete pavement is performed as shown in Fig. 1, and the concrete pavement is cut to remove the deteriorated parts, and then the road pavement is laid and finishing (finisher, tinning, etc.) is performed.

Hereinafter, the present invention will be described in detail based on a test example. However, the following test examples are only for illustrating the present invention, and the scope of the present invention is not limited thereto.

[ Test Example 1 ] Fast speed  ceramic Binders

1. Ceramic binder composition

The ceramic fasteners were prepared as shown in Table 1 below.

Material composition (parts by weight) division Comparative Example Example Remarks Water repellent magnesia 100 100 97% by weight of magnesia (MgO 97.5% 1300 ° C 3H calcination) and 3% by weight of a water repellent agent (calcium stearate) were mixed and milled in a ball mill for 30 minutes.
The powder also has a density of 2,350 cm < phosphate 35 35 Potassium dihydrogen phosphate: ammonium dihydrogen phosphate
= 8: 2 (weight ratio) Sodium metaphosphate 7 7 - Borate 11 11 - Reactive extender 28 28 Fly Ash: specific gravity 2.23, powder 3450 cm2 / g
Urea - 3.5 Formula CO (NH _{2) 2,} specific gravity 1.335,
NITROGEN CONTENT> 46 wt%, IRON <1 ppm, MOISTURE <0.5 wt%, FREE AMMONIA <150 ppm Alkaline salt - 1.5 Sodium sulfate (Na ₂ SO ₄ ): specific gravity 2.69,
A content of > 99 wt%, an insoluble content of < 0.05 wt%

2. Mortar formulation

The mortar was compounded with the binder prepared in the same composition as the above [Table 1] under the conditions as shown in Table 2 below.

Mortar combination division Comparative Example / Example Aggregate rain Binder material: standard yarn = 1: 1 (weight ratio) Mixed water Mixed water / binder = 14 wt%

3. Mortar characteristics

The flowability, curing time, compressive strength and length variation at different ages were tested for the mortar according to Table 2 above. The fluidity test was carried out by the flow test according to KS L 5105 and the circle diameter was expressed in mm. The compressive strength test was carried out in accordance with KS F 2405 by preparing a specimen according to KS F 2403. A 40 × 40 × 160 mm test specimen was prepared, and attached strain strain gage was attached and measured continuously for 56 days in a temperature and humidity chamber at 20 ± 2 ° C and a relative humidity of 60 ± 5%. The test results are shown in [Table 3] below.

Mortar performance division Comparative Example Example Flow (mm) 160mm 225mm Curing time (based on initials) 8 minutes 21 minutes Heating temperature (1H) 45 34 Heating temperature (3H) 63 56 Strength (MPa) 2 hours 38 28 4 hours 43 37 1 day 56 57 3 days 78 76 7 days 86 91

As shown in the above [Table 3], the initial reaction heat was suppressed, the curing time was delayed and the fluidity was improved as compared with the comparative example, and the phenomenon was recovered again at the strength after 4 hours.

[ Test Example 2 ] Concrete road packaging material

1. Concrete road packaging material formulation

The mortar was compounded with the composition as shown in Table 4 below using the ceramics binder of initial speed [Table 1] above. The most rapidly known CSA (calcium sulfoaluminate) based ultra rapid cement among portland cement based fast curing cement was compared and the performance of the ultra rapid ceramic binder according to the present invention was compared with the first and second embodiments.

Concrete road packaging material combination division Coarse aggregate
Maximum dimensions
(mm) Water coupling ratio
(W / C) (%) Fine aggregate rate
S / a (%) Unit quantity (kg / m³) Water (W) CSA system
Fast speed
cement Examples of [Table 1] Fine aggregate
(S) Coarse aggregate
(G) Latex Comparative Example 19 38 54 76 360 - 906 783 115 Example 1 13 22 52 119 - 540 844 794 - Example 2 13 23 50 110 - 480 864 880 -

2. Performance of concrete road pavement material

For the concrete road pavement in Table 4, fluidity, compressive strength / bending strength / bond strength, and salt penetration resistance according to ages were tested. The test results are shown in Table 5 below.

Performance of concrete roadway packaging material division Example 1 Example 2 Comparative Example Standard of road construction specification Slump (mm) 200 210 190 160 ~ 220 Air volume (%) 4.9 4.1 4.3 3 to 6% Compressive strength
(MPa) 3hr 28.2 23.6 - 21 MPa or more
(Based on opening time) 4hr - - 23.1 7 days 36.9 31.2 28.3 28th 49.3 40.2 35.8 Flexural strength (MPa) 3hr 4.7 4.1 - 3.15MPa or more
(Based on opening time) 4hr - - 3.7 7 days 7.2 5.8 4.6 28th 9.8 8.7 7.8 Bond strength (MPa) 3hr 2.4 1.9 - 1.4Mpa or more
(Based on opening time) 4hr - - 1.5 7 days 2.6 2.4 1.6 28th 3.2 2.9 1.6 Salt penetration resistance 7 days 322 387 1420 Below 1000 Coulombs

As shown in [Table 5], it was confirmed that the comparative example and examples 1 and 2 satisfied the road construction specifications, and the compressive strength / flexural strength / 1 and 2 exhibited a strength of more than the open time reference (3 hr) faster than the comparative example. In the comparative example, the salt penetration resistance did not satisfy the road construction specification standard, but in Examples 1 and 2, it is confirmed that the road construction specification criterion satisfies the excellent level.

[ Test Example 3 ] Field application characteristics

1. Field production

The concrete road pavement was produced in the same manner as in [Table 6].

Field Production Scheme division Coarse aggregate
Maximum dimensions
(mm) slump
(cm) Water coupling ratio
(W / B) (%) Fine aggregate rate
S / a (%) Unit quantity (kg / m³) water
(W) Example (B) of Table 1 [ Fine aggregate
(S) Coarse aggregate
(G) combination 13 16 to 22 22 54 119 540 847 730

2. Performance Evaluation

The performance of the concrete road pavement of Table 6 was evaluated, and the results are shown in Table 7 below.

Performance of Concrete Road Packaging Materials division result Assessment Methods Compressive strength (MPa) 28.6 (3 hours) KS F 2405 Flexural strength (MPa) 4.6 (3 hours) KS F 2408 7.4 (7 days) Bond strength (MPa) 1.82 (3 hours) KS F 2762 2.12 (7 days) Salt penetration resistance (Coulombs) 470 (7 days) KS F 2711 Dry shrinkage (%) 0.0317 (7 days) KS F 2424

As shown in [Table 7] above, even in the case of continuous mass production of concrete pavement materials, excellent performance was shown in compressive strength / bending strength / bond strength / construction shrinkage. Accordingly, the concrete road pavement material according to the present invention is expected to be applied in a large amount to road paving work or road pavement repair work.

Claims (5)

delete delete In concrete road pavement formulations,
Unit bonding disposal amount (B) 380 to 600 kg / m 3; Fine aggregate ratio (S / a) of 45 to 55% by weight; Water binding ratio (W / B) of 20 to 24% by weight; Largest aggregate size 25mm; Slump 150 ~ 220mm; designed to be mixed,
The binder is composed of 70 to 90% by weight of a primary phosphate based on at least one of potassium dihydrogen phosphate (KH ₂ PO ₄ ) and sodium dihydrogen phosphate (NaH ₂ PO ₄ ), 100 to 2% 15 to 45 parts by weight of a phosphate composed of 10 to 30% by weight of a second phosphate by at least one of (NH ₄ ) ₂ HPO ₄ and ammonium dihydrogen phosphate (NH ₄ H ₂ PO ₄ ); 1 to 10 parts by weight of sodium metaphosphate (NaPO ₃ ) ₆ ; 1 to 10 parts by weight of a borate selected from boric acid (H ₃ BO ₃ ) and borax (Na ₂ B ₄ O ₇ · 10H ₂ O); 10 to 40 parts by weight of an extender selected from at least one of a pozzolana powder and a mineral powder; 0.5 to 7 parts by weight of urea (CO (NH ₂ ) ₂ ); 0.3 to 4 parts by weight of an alkali salt prepared from at least one of potassium sulfate (K ₂ SO ₄ ) and sodium sulfate (Na ₂ SO ₄ ), wherein the water repellent magnesia is magnesium carbonate (MgCO 3) or dolomite 0.5 to 5 parts by weight of a water repellent selected from wax emulsion, calcium stearate and aluminum stearate are mixed and ground in 100 parts by weight of magnesia calcined at 1100 to 1350 캜 at a temperature of 1500 to 3000 g / Cm &lt; 2 &gt;. A concrete road paving method according to claim 3, characterized in that a concrete road pavement material according to claim 3 is laid on the base layer of the road. The concrete road pavement repairing method is characterized in that the concrete pavement is cleaned by removing the deteriorated part of the concrete pavement surface, and then the concrete road pavement material according to claim 3 is laid.

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