KR20060099465A - Paving method of bridge having the excellent waterproofing performance and fatigue resistance - Google Patents

Abstract

According to the present invention, the strain hardening property of the stress increases again with the increase of the strain without the decrease of the stress by the bridging of the fiber even after the initial cracking under the bending and tensile load action, and the initial occurrence in the process High toughness mortar composition for bridge pavement that exhibits multiple crack characteristics without crack width progressing and multiple cracks occur around the initial crack and various new and old bridge decks It is about the construction method. That is, the high toughness mortar composition for cross-linking packaging of the present invention is 500 to 750 parts by weight of cement, 1 to 200 parts by weight of fly ash, 1 to 100 parts by weight of silica fume, 1 to 200 parts by weight of limestone fine powder, 500 to 750 parts by weight of fine aggregate, ash oil. 10 to 80 parts by weight of a fire-resisting powder resin, 10 to 100 parts by weight of CAS-based expander, 0.1 to 5.0 parts by weight of methyl cellulose thickener, 5 to 45 parts by weight of water reducing agent, 1 to 15 parts by weight of air conditioner (AE), 275 parts by weight It is characterized in that it is composed of ~ 365 parts by weight, 5 to 35 parts by weight of micro short fibers.

Mortar, composition, cross-packaging, construction method, short fiber, tensile deformation performance, fatigue performance, multiple cracks, waterproof, crack control performance

Description

Paving method of bridge having the excellent waterproofing performance and fatigue resistance}

1 is a view showing the configuration of the cross-packaging excellent in waterproof performance and fatigue resistance of the present invention.

Figure 2 is a graph showing the flexural load-displacement curve by the three-point bending test of the test body (10 x 10 x 40 cm) using the high toughness mortar of the present invention.

3 is a photograph showing an example of multiple cracks generated on the bottom of the test body after the bending test of the test body (10 × 10 × 40 cm) using the high toughness mortar of the present invention.

** Description of the symbols for the main parts of the drawings **

01: Bridge deck (concrete deck or steel deck)

02: toughness mortar

03: waterproof layer

04: Asphalt Paving Layer

The present invention relates to a bridge paving method of concrete and steel plates on bridge structures. The present invention also relates to a high toughness mortar composition for cross-linking packaging having a direct tensile modulus of at least 0.5%. In more detail, the present invention is a background treatment process for removing foreign matter from the bridge deck, the process of pouring a high toughness mortar having multiple crack characteristics and direct tensile deformation ability of more than 0.5% to a thickness of 1 ~ 5cm, immediately after pouring high toughness mortar It relates to a cross-linking method to improve the waterproofing performance and fatigue resistance, characterized in that the coating cure is formed, the step of forming a waterproof layer on the surface of the high toughness mortar, asphalt paving step of laying the asphalt after forming the waterproof layer. . In addition, the present invention is 500 ~ 750 parts by weight of cement, fly ash 1 ~ 200 parts by weight, silica fume 1 ~ 100 parts by weight, limestone fine powder 1 ~ 200 parts by weight, fine aggregate 500 ~ 750 parts by weight, re-emulsified powder resin 10 ~ 80 parts by weight Part, 10 to 100 parts by weight of the CAS-based expander, 0.1 to 5.0 parts by weight of a methyl cellulose thickener, 5 to 45 parts by weight of a water reducing agent, 1 to 15 parts by weight of an air conditioner (AE agent), 275 to 365 parts by weight of mixed water, micro It relates to a cross-linking high toughness mortar composition expressing a direct tensile deformation ability of 0.5% or more, characterized in that 5 to 35 parts by weight of short fibers.

In the existing method, the method of paving the waterproof layer on the bridge deck and paving the asphalt on it as a bridge paving protection bridge for bridges is mainly used for economic and construction reasons. Due to the difference in coefficients, various defects such as cracks, potholes, and plastic deformations are generated. As a result, various problems such as destruction of the waterproof layer, moisture penetrating into the bridge deck, and various deterioration phenomena are generated.

As the existing bridge pavement method, first, the method of forming the asphalt mixture into 5 ~ 8cm after forming the waterproof layer on the bridge deck is the most commonly applied method. However, the above method has a problem in that deterioration factors such as water or Cl ^- ions penetrate into the cracked part of the asphalt, and the bridge deck deteriorates due to freezing and thawing, or the reinforcing bar is corroded, thereby deteriorating the life of the bridge structure. Due to this, there is a problem that causes traffic jams due to this frequent repair work.

Second, a method of placing LMC (Latex Modified Concrete) on a bridge deck is disclosed in the Republic of Korea Patent No. 312599, which incorporates SBR-based latex to improve the bending strength, dry shrinkage resistance and waterproof performance of concrete for bridge construction. . However, while flexural strength is increased, flexural toughness and tensile deformation ability are similar to those of conventional concrete, they cannot resist cracking due to thermal behavior and fatigue load, and harmful cracking occurs, requiring frequent crack repair work after construction. There is a problem. In addition, since the finishing surface of the pavement is concrete, there is a problem that the runability and ride comfort is significantly lower than that of asphalt.

Third, a bridge packaging method that adds the characteristics of a super speed mirror for placing VES-LMC (Very Early Strength-Latex Modified Concrete) on a bridge deck is disclosed in Korean Patent Laid-Open Publication No. 10-2000-0071932. The above method has the same flexural toughness and tensile deformation ability as conventional concrete in the same way as the LMC bridge pavement method. Since it is a super-speed mirror, harmful cracks are frequently generated immediately after construction due to construction errors. There is a problem that the construction cost is greatly increased.

Accordingly, the present inventors have made diligent efforts to improve the problems of the prior art. As a result, no harmful cracks (crack widths exceeding about 100 μm) occur under bending or tensile load, and the waterproof performance is considered in consideration of the use environment of the bridge. And it was confirmed that the development of cross-linking mortar and the method excellent in fatigue resistance was completed the present invention.

SUMMARY OF THE INVENTION An object of the present invention is to provide a high toughness mortar composition for crosslinking packaging that exhibits multiple cracks with a plurality of microcracks (100 μm or less in width) under flexural and tensile loads, as well as expressing direct tensile deformation ability of 0.5% or more.

Still another object of the present invention is to provide a crosslinking paving method comprising an asphalt mixture using a high toughness mortar composition exhibiting a direct tensile deformation ability of 0.5% or more when crosslinking to ensure driving performance or ride comfort.

In order to achieve the above objects, the present invention is a cement 500 ~ 750 parts by weight, fly ash 1 ~ 200 parts by weight, silica fume 1 ~ 100 parts by weight, limestone fine powder 1 ~ 200 parts by weight, fine aggregate 500 ~ 750 parts by weight, re-emulsification 10 to 80 parts by weight of the powder resin, 10 to 100 parts by weight of the CAS-based expander, 0.1 to 5.0 parts by weight of the methyl cellulose thickener, 5 to 45 parts by weight of the water reducing agent, 1 to 15 parts by weight of the air conditioner (AE agent), compounded water 275 It provides a high toughness mortar composition for cross-packaging exhibiting a direct tensile deformation ability of 0.5% or more, characterized in that the composition is composed of ~ 365 parts by weight, 5 to 35 parts by weight of micro short fibers.

In the present invention, the micro short fibers are PVA fibers (diameter 30 to 100 μm, length 6 to 12 mm) or high tensile PET fibers (diameter 5 to 50 μm, length 6 to 15 mm) alone, or PVA fibers and high tensile strength. It relates to a cross-linking high toughness mortar composition exhibiting a direct tensile deformation ability of 0.5% or more, characterized by mixing PE fibers (diameter 5-50 μm, length 6-15 mm) at a weight ratio of 0.75-0.95: 0.05-0.25. .

In addition, in the present invention, in order to induce a more stable multiple cracks while lowering the unit volume weight of the high toughness mortar, 1 to 100 parts by weight of PE beads having a particle size of 2.5 to 5.0 mm or 2.5 to 8.0 mm are further added. .

In addition, the present invention, a) a ground treatment process for removing foreign matter in the bridge deck, b) a process of pouring a high toughness mortar having a multiple crack characteristics and direct tensile deformation ability of more than 0.5% to a thickness of 1 ~ 5cm, c) high Waterproofing performance and fatigue resistance, characterized in that it comprises the step of applying the coating curing agent after the tough mortar, d) forming a waterproof layer on the surface of the high toughness mortar, e) asphalt paving process of laying the asphalt after forming the waterproof layer It is about improved pavement method.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings.

As a binder used in the high toughness mortar composition for cross-linking packaging of the present invention, cement is usually used as a portland cement, a crude steel portland cement, a crude steel portland cement, and a cemented carbide cement. The use of light cement is preferred. As a binder, 500 to 750 parts by weight of cement is used, and preferably 570 to 650 parts by weight. In addition, fly ash, which is an industrial by-product, is used in an amount of 1 to 200 parts by weight, preferably 120 to 160 parts by weight, and limestone powder is used in an amount of 1 to 200 parts by weight. Preferably 110 to 150 parts by weight. In the case of silica fume, 1 to 100 parts by weight is used, and preferably 30 to 50 parts by weight. In the case of fine aggregate, 500 to 750 parts by weight is selected by selecting from No. 7 silica sand or mixed silica sand of No. 7 and No. 6 silica (the No. 7: No. 6 weight mixing ratio is 0.7 to 0.3: 0.3 to 0.7). Parts by weight are used. In addition, the re-emulsified powder resin used to improve the bending performance of the high toughness mortar is used 10 to 80 parts by weight, preferably 60 to 75 parts by weight, CAS-based expander is 10 to 100 parts by weight is preferred Preferably 60 to 80 parts by weight. The methylcellulose thickener is used in an amount of 0.1 to 5.0 parts by weight, a reducing agent is used in an amount of 5 to 45 parts by weight, and an air conditioner (AE agent) is used in an amount of 1 to 15 parts by weight, preferably 4 to 7 parts by weight. Micro short fibers are PVA fibers (diameter 30-100㎛, length 6-12mm) or high-strength PET fibers (diameter 5-50㎛, length 6-15mm) alone are used in 3 to 35 parts by weight, or It is preferable to mix and use high tension PE fiber (diameter 5-50 micrometers, length 6-15 mm) by 0.75-0.95: 0.05-0.25 weight ratio. 275-365 weight part of compounding water is used, Preferably 300-340 weight part of tap water is used. In addition, 1 to 100 parts by weight of PE beads having a particle diameter of 2.5 to 5.0 mm or 2.5 to 8.0 mm are added to induce a more stable multiple crack while lowering the unit volume weight of the high toughness mortar. PE beads are preferably used in 20 to 50 parts by weight. Artificial lightweight aggregate or PP beads may be used instead of PE beads.

Next, a description will be made of a cross-packaging method using a high toughness mortar composition of the present invention configured as described above with reference to FIG.

That is, when resurfacing the bridge, the existing packaging material is first removed, and when the bridge is newly packed, this process is omitted. Subsequently, the process of removing foreign matters from the bridge deck that cleans and cleans the base surface while keeping the concrete in a wet state (base treatment process), and the process of pouring high toughness mortar to a thickness of 1 to 5 cm after the ground treatment process. The high toughness mortar of the present invention is carried and poured (FIG. 1-02), the minimum pouring thickness is 1 cm or more, and the pouring height is poured about 3 to 10 mm higher than the planned height. At this time, it is excellent in adhesion with the matrix (bridge top plate) 01 and integrated with the high toughness mortar layer 02. After the high toughness mortar casting process, the coating curing agent is applied. A waterproof layer is formed on the surface of the high toughness mortar, and after the waterproofing layer is formed, the asphalt packaging method improves the waterproofing performance and the fatigue resistance. The bridge packaging method according to the present invention forms a high toughness mortar layer (02) having excellent crack control performance (multiple crack characteristics) and tensile strain (direct tensile strain of 0.5% or more) in the middle of the bridge packaging as described above. In the construction process, it is possible to completely control the cracks caused by dry shrinkage, and has excellent adhesion to the matrix (bridge deck) (01), so that it is integrated with the high toughness mortar layer (02) to change the volume due to temperature change (shrinkage / expansion). ), Even if harmful cracks are generated in the bridge deck due to vibration fatigue (such as the vehicle's wheel load), the toughness mortar layer (02) relieves the progress of the crack width, so that no harmful crack is generated. In addition, even if the deterioration factors such as water or Cl ^- ions penetrate into the crack portion of the asphalt layer 04, the deterioration factor does not penetrate to the bridge deck 01 due to the excellent waterproofing and crack control performance of the high toughness mortar layer 02. It is a bridge paving method that improves waterproof performance and fatigue resistance.

Hereinafter, embodiments of the present invention will be described in detail, and the scope of the present invention is not limited to these examples.

(Examples and Comparative Examples)

Table 1 Formulations of Examples and Comparative Examples of the Invention

division Material Unit weight (kg / m ³ ) Remarks Example 1 Example 2 Example 3 Comparative Example 1 Compound Formulation water 320 320 320 320 Tap water cement 600 600 600 600 Common Portland Cement Fly ash 145 145 140 145 - Silica fume 40 40 40 40 - Limestone fine powder 140 140 120 140 - Fine aggregate 600 600 600 600 No. 7: No. 6 = 0.5: 0.5 Reemulsifying Powder Resin 60 60 60 75 RE-5010N CSA type expander 70 70 70 70 Denka No-20 MC thickener 1.1 1.1 1.1 1.1 HPMC Water reducing agent 25 25 25 25 Naphthalene Water-Resistant AE 4.8 4.8 4.8 4.8 - PVA Fiber 26 20 18 0 39㎛ Diameter, 12mm Length High tension PET fiber 0 0 8 0 18㎛ diameter, 12mm length High tensile PE fiber 0 6 0 0 Diameter 12㎛, Length 15mm PE Bead 0 0 30 0 Diameter 2.5 ~ 5mm

In the examples and comparative examples of the present invention, the mortar bibeam was carried out using a 10-liter vent type mortar mixer. The mortar after the bibeam was filled in each mold for 24 hours in a constant temperature room at a temperature of 20 ± 3 ℃, 60 ± 5% humidity, then demolded to a temperature of 20 ± 3 ℃, 60 ± 5% humidity The specimens were cured by 28 days of age in a greenhouse to prepare test specimens.

Experimental Example

In this Example and Comparative Examples, the values of adhesion strength (test specimen 10 × 20 cm) and flexural strength (test specimen 10 × 10 × 40 cm) were carried out on specimens cured up to 28 days of age in water of 20 ± 3 ° C.

26 parts by weight of PVA (39 μm in diameter, 12 mm in length) as a micro short fiber (Example 1), 20 parts by weight of PVA (39 μm in diameter, 12 mm in length) and 6 parts by weight of high tensile PE fiber (12 μm in diameter, 15 mm in length) Example 2) was used, and Example 3 is a micro short fiber PE beads having 18 parts by weight of PVA (39 μm in diameter, 12 mm in length), 8 parts by weight of high tension PET (18 μm in diameter, 12 mm in length), and 2.5-5 mm in diameter. 30 parts by weight was used. As a result of the test with the comparative example in which no micro short fibers were added, Examples 1, 2, and 3 significantly improved the bending performance and durability compared with the comparative example (no fiber incorporation). Compared with the comparative example (fiber-free), the overall physical properties were greatly improved, and the flexural strength was increased by about twice as compared with the comparative example, and the example showed stable multiple crack characteristics, and the average crack width at the bending test was 100 μm or less. 2 and 3, the comparative example showed brittle fracture shape as one crack was confirmed during flexural failure, and the crack width could not be measured. Tensile strength was 4.2 MPa or more in the example but was relatively low at 2.9 MPa in the comparative example. Tensile strain at the time of tensile fracture in the direct tensile test was more than 2.01% in the case of the example, 0.015% in the comparative example was found to be similar to that of the general concrete.

Table 2 Experimental Results of Examples and Comparative Examples of the Present Invention

division Example 1 Example 2 Example 3 Comparative Example 1 Remarks Test result Adhesion Strength (MPa) 2.9 3.1 2.7 2.4 KS F 4042 Flexural strength (MPa) 13.8 15.6 13.4 7.6 KS F 4042 Number of cracks in flexural test 29 41 36 One Visual observation Average crack width during bending test (㎛) 57 42 40 Not measurable Crack Gauge With / Without Multiple Cracks U U U radish Visual observation Direct tensile strength (MPa) 4.2 4.8 4.7 2.9 Direct Tensile Test Direct tensile strain (%) 2.01 3.54 3.12 0.015 Intensity test Permeability (g) 6.2 5.8 6.8 6.8 KS F 4042 Comprehensive Evaluation Great Very good Great Bad -

The high-strength mortar composition for cross-packaging of the present invention is manufactured by properly combining the parameters related to the interfacial adhesion characteristics of the fiber, the matrix and the fiber / matrix so that the deformation hardening behavior and the multiple crack characteristics can be stably exhibited under the bending and tensile loads. Compared to the existing steel fiber reinforced concrete, LMC paving concrete, or high toughness cement composite, high bending and tensile strength can be expressed, and crack control performance, fatigue performance, deformation performance, and durability can be greatly improved.

By using the high toughness mortar composition for bridge pavement with such performance in new or aged bridges, it improves the crack dispersibility of the bridge pavement material and controls the crack width to prevent waterproofing and penetration of harmful substances such as Cl ^- or CO ₂ . Not only can it improve significantly, but also it exhibits direct tensile deformation performance of more than 0.5% to improve the flexural toughness and deformation performance, which greatly improves the fatigue performance against the lubricating load of the bridge, which enables high durability and long life of new and existing bridges. Finally, there is an effect to reduce the maintenance cost.

Claims (4)

500 to 750 parts by weight of cement, 1 to 200 parts by weight of fly ash, 1 to 100 parts by weight of silica fume, 1 to 200 parts by weight of limestone fine powder, 500 to 750 parts by weight of fine aggregate, 10 to 80 parts by weight of reemulsified powder resin, CAS 10 to 100 parts by weight of expanding material, 0.1 to 5.0 parts by weight of a methylcellulose thickener, 5 to 45 parts by weight of a water reducing agent, 1 to 15 parts by weight of an air conditioner (made by AE), 275 to 365 parts by weight of mixed water, and 5 to 5 micro short fibers Cross-linking high toughness mortar composition exhibiting a direct tensile deformation capacity of 0.5% or more, characterized in that the composition is 35 parts by weight. The method of claim 1, wherein the micro short fibers are PVA fibers (diameter 30-100 μm, length 6-12 mm) or high tensile PET fibers (diameter 5-50 μm, length 6-15 mm) alone, or PVA fibers and high tensile PE. A high toughness mortar composition for cross-linking packaging having a tensile strength of at least 0.5%, characterized in that a mixture of fibers (diameter of 5 to 50 µm and length of 6 to 15 mm) in a weight ratio of 0.75 to 0.95: 0.05 to 0.25 is used. The method according to claim 1, wherein 0.5 to 5.0 parts by weight of PE beads having a particle size of 2.5 to 5.0mm or 2.5 to 8.0mm is further added in order to induce a more stable multiple crack while lowering the unit volume weight of the high toughness mortar. A high toughness mortar composition for cross-linking packaging having a direct tensile modulus of at least%. In the bridge paving method of concrete slabs and steel slabs on bridge structures, a) a background treatment process for removing foreign matter from the bridge deck; b) pouring a high toughness mortar having a multiple cracking property and a direct tensile deformation capacity of 0.5% or more to a thickness of 1 to 5 cm; c) applying a coating curing agent immediately after high toughness mortar casting; d) forming a waterproof layer on the surface of the high toughness mortar; And e) Bridge paving method to improve the waterproof performance and fatigue resistance, characterized in that the asphalt paving process of laying the asphalt after forming the waterproof layer.

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