KR20050019161A - Geogrid for reinforceing and repairing the paved road and its manufacturing method - Google Patents

Abstract

PURPOSE: A geotextile grid for reinforcing and repairing asphalt and concrete pavements is provided to effectively inhibit plastic deformation and reflective cracking of asphalt and concrete pavements and have excellent adhesion to pavement surface. CONSTITUTION: The geotextile grid for reinforcing and repairing asphalt and concrete pavements is manufactured by a process comprising the steps of: (a) supplying glass fiber roving yarn from a creel(1) to a weaver(2) with constant tension by a rotation of a delivery beam(3), an automatic tension controller; (b) weaving a geogrid by crossing a rib of 2-4 warp glass fiber roving yarns and a rib of 1-4 weft glass fiber roving yarns in a lattice, and simultaneously tying the intersection of the warp roving yarns and the weft roving yarns in a leno weave; (c) coating the both sides of the geogrid with coatings; and (d) applying a polymer adhesive to the one side of the coated geogrid.

Description

Geogrid for reinforcement and repair of pavement roads and its manufacturing method {Geogrid for reinforceing and repairing the paved road and its manufacturing method}

The present invention relates to geogrid for reinforcement, repair of asphalt and concrete pavement, and a method of manufacturing the same.

More specifically, the present invention relates to a reinforcement for a pavement, a geogrid for repair, and a method of manufacturing the same, having excellent adhesion to a road surface and workability.

Asphalt pavement used as an overlay on asphalt or concrete pavement is a structure that reacts sensitively to climate and environment. The pavement is the structure of the asphalt mixture due to consolidation of the asphalt mixture due to overload of the running vehicle and repeated loading of the vehicle. The so-called 'plastic deformation' occurs due to the reduction of voids, the settlement of the ground, and the stress due to the continuous load, and the strength and stability of the road layer due to the asphalt overlay at the discontinuous step such as the bridge, the shift entrance and the joint of the concrete pavement. As it falls, cracks occur and 'reflective cracks' occur, which propagate to the upper layers of the asphalt.

In order to cope with the structural damage of the asphalt pavement, wire mesh (USP 5106227) or mesh metal plate (USP 5600929) is used as a reinforcement in the asphalt pavement layer in North America and Europe. It is evaluated that the plastic deformation and crack of can be reduced.

However, the metal reinforcement had poor adhesion with asphalt during construction, and later caused complex problems in the disassembly and recycling of the package.

In addition, various geotextile products made of more flexible materials have been attempted to solve construction problems.

Among them, the asphalt pavement reinforcing fiber (USP 6207593) coated with a needle punched nonwoven fabric (USP 6207593) has a lower rigidity than asphalt concrete, so it is difficult to expect a reinforcing effect due to tensile force, and polyester geogrid (USP 5091247, Japanese Patent Application Laid-Open No. Hei 9-100527) has a large heat shrinkage ratio of the material itself, so that when the asphalt concrete is packaged at a high temperature of 100 ° C. or higher, the morphological stability is reduced due to thermal deformation, the elastic modulus is decreased, and the elongation at break is increased. There is a problem of this deterioration.

It is an object of the present invention to provide a reinforcement, repair geogrid for asphalt and concrete pavement that can effectively suppress plastic deformation and reflection cracking of asphalt and concrete roads and a method of manufacturing the same.

Hereinafter, the present invention will be described in detail with reference to FIG. 1.

In supplying the glass fiber roving yarn directly from the krill stand 1 to the loom 2 without undergoing the canoning process, the tension of the delivery beam 3 is reduced in response to the tension sensed through the separately produced delivery beam 3. Rotating the delivery beam (3) to be automatically controlled to impose a uniform tension on the glass fiber roving yarn and supply it to the loom to weaving efficiently.

At the same time, the polyester yarn is stitched into a lattice-like fabric by stitching single or double lenostatics at the intersection of warp and weft yarns.

The fabric thus made is continuously immersed in the coating liquid while passing through the bath 4 of the coating liquid, and after removing and adjusting the excess coating liquid through the pressing roller 5, the coating liquid is solidified while passing through the heat treatment section 6, In response to the sensed tension for equalization of the winding tension, several upper rollers pass through the buffer accumulator 7 which moves up and down.

One side of the solidified geogrid product is passed through the roller 8 of the bath containing the adhesive liquid, and then passed through another heat treatment section 9 to impart a surface adhesive performance and the buffer transfer device 10. The geogrid is wound around the winding roller 11 via a plurality of rollers.

The glass fiber roving yarn used in the present invention is a conventional long fiber glass fiber roving yarn, and may be used by fusing these fibers as necessary.

The geogrid according to the present invention is woven using the fiberglass roving yarn as warp and weft yarn and the grid size is 5 to 30 mm.

At this time, each rib in the warp direction and the weft direction forming the lattice is made of plain weave by several strands of fiberglass roving yarns, and polyester which is a squeezing yarn when weaving with fiberglass roving yarns to strengthen the fabric structure. Sag tilt This is connected to the intersection of the warp and the weft in a single or double leno weave form to form a solid lattice-like structure to fix the warp not close.

The geogrid according to the present invention has a lattice size of 5 to 30 mm, more preferably 10 to 25 mm, of the geogrid structure.

The grid size as described above is considered that the nominal maximum dimension of the coarse aggregate currently used for asphalt surface layer is 19mm and the nominal maximum dimension of the coarse aggregate used for base layer is 25mm or less, and damage of glass fiber geogrid by external impact It is designed to suppress as much as possible and make effective reinforcement.

If the lattice size is less than 5 mm, the voids of the ribs constituted are too small than the aggregate particle size of the asphalt concrete to be used in construction, thereby reducing the strength reinforcing effect by the aggregate penetration of the upper and lower portions of the geogrid.

In addition, when the lattice size exceeds 30mm, the fineness of the fiberglass constituting the ribs and the surface area of the ribs are increased when weaving the geogrid of the same strength, so that it is difficult to effectively control the tension of the fiberglass, and the joining workability of the steep slope is deteriorated. there is a problem.

In the present invention, the ratio of the area of the opening to the total area of the geogrid, that is, the area percentage (porosity) occupied by the voids is 50% or more and 75% or less.

In addition, in the present invention, the total thickness of the warp and the lattice size between the ribs can be changed according to the desired product design, but the number of warp yarns in the radial direction forming one rib is 2 to 4 and the number of weft yarns in the upper direction is 1 to It is preferable to make four pieces so that each may not exceed four pieces.

If the number of heads of the warp and weft yarns exceeds 4, the weaving yarns are focused on the weft warp, so that uniform tension is not formed, and the weaving workability is lowered, resulting in a non-uniform geogrid.

2a and 2b is an example of the fabric structure of the geogrid fabric for road reinforcement, repair of the present invention.

Cross wefts 21, 22, 23, 24 and wefts 21 '22' 23 '24' during the weaving process to prevent warp phenomena when forming warp ribs and weft ribs in a grid In order to fix the shape of the fabric, weaving the intersection of the warp and weft yarns with lenojik using Ik slope 25 or 26 as shown in FIG. 2a or Ik slope 25 and 26 as shown in FIG. To be in close contact with each other.

In the present invention, the material of the coating liquid is a high molecular compound such as bitumen, acrylic resin, such as asphalt bitumen, in consideration of the shape stability of the geogrid, durability, adhesion to glass fibers, and the like.

Particularly, the coating material for road reinforcement and repair geogrid has 10 ~ 40 penetration at 25 ° C, softening point of 80 ° C or higher, and toluene solubility of 40% or more in blown asphalt or polymer modified blown asphalt modified with modified polymer. It was chosen.

Polymer Modified Blown Asphalt is composed of modified polymers such as PE (Polyethylene), SBS (Styrene-Butadiene Block Copolymer), SIS (Styrene-Isoprene Block Copolymer), SBR (Styrene Butadiene Block Copolymer) 20 wt% of the mixture is mixed and stirred at 180 ° C. for 2 hours.

Polymer modified blown asphalt has no stickiness, adhesion to asphalt is improved, and physical properties change little due to temperature change.

Blown asphalt or polymer modified blown asphalt is solidified by heat treatment at 100 ° C. or higher after coating the fabric by an immersion method or spraying method as shown in FIG. 1.

One side of the coated geogrid is treated with a pressure-sensitive adhesive through a roller touch, and solidified for 2 minutes in a heat treatment section at 120 ° C. to give adhesive performance.

This is to express the adhesive force with the road surface at the time of installation to ensure excellent installation work in the field.

As the adhesive, acrylic emulsion type (40% or more solids) or solvent type (40% or more solids) is used.Adhesive power makes it easy to release the rolled geogrid in the form of a roll when working in the field, while maintaining adhesiveness with the road surface. In accordance with KS 1107, the range is 300 to 900 gf.

In addition, by combining the geotextiles of woven or nonwoven fabrics on one side of the glass fiber geogrid, it is possible to further impart a degree effect.

At this time, the woven fabric used is a unit weight of 200 ~ 1000 g / m ² , the nonwoven fabric is a polyester or polyethylene-based product having a unit weight of 100 ~ 300g / m ² .

The woven or nonwoven fabric is bonded to the glass fiber geogrid using a bonding method by an adhesive or a sealing method by edge squeezing.

At this time, it can also be used by treating the pressure-sensitive adhesive on one side of the woven or non-woven fabric as described above so as to adhere well to the construction road surface.

* Assessment Methods

 1. The strength and elongation of geogrid were evaluated by the method of ASTM D 4595.

 2. The grid size of the geogrid is as follows with reference to FIG.

    Grid size = a × b

 3. The porosity of the geogrid is the area that the rib does not occupy in the total area of the geogrid.

    That is, it is expressed as a percentage of the area occupied by the voids, referring to FIG. 2 as follows.

    All.

    Porosity = (c × d) × 100 / (a × b)

 3. The crack resistance test method is as follows.

   As shown in Fig. 3, in order to simulate the paving condition of the asphalt overlay, a reinforcement 2 is inserted onto the discontinuous concrete block 1 having a thickness of 100 mm, a width of 100 mm, and a length of 300 mm, and a thickness of 50 mm, a width of 100 mm, and a length of 300 mm. Asphalt beam specimen (3) was produced and attached in the form of overlay.

   The concrete block (1) was given an initial crack of 10 mm from the upper surface to 1/3 depth, and a 75 × 75 mm square steel plate 4 was loaded on the asphalt specimen at a speed of 10 Hz using a hydraulic material tester.

   At this time, a rubber pad 5 was inserted between the load plate and the asphalt specimen to simulate the contact between the tire and the pavement surface.

The maximum load for the square steel loading board was 7kgf / cm ² (100psi) to simulate the tire pressure.

    The fatigue life was evaluated by measuring the number of cycles of cumulative load, that is, the number of repetitions of the load when the vertical crack reached the total height of the asphalt specimen.

 4. Plastic deformation resistance test method is as follows.

    As shown in Fig. 4, in order to simulate the asphalt overlay pavement state, the asphalt specimen 3 was attached on the two concrete blocks 1 having a thickness of 30 mm, a width of 80 mm, and a length of 145 mm.

    At the center of the two pieces of concrete blocks, the top surface was tack-coated at intervals of 10 mm to insert the reinforcement (2), and the asphalt specimen 3 of thickness 50 mm, width 80 mm, and length 300 mm was attached.

    A 10 mm thick rubber sheet 4 was laid on the concrete floor to simulate the elastic support under the concrete.

    This specimen was cured for 2 days at room temperature, and then placed in a constant temperature chamber at 25 ° C five hours before the test, and then a 200 mm diameter steel wheel reciprocated a distance of 200 mm in a chamber maintained at 25 ° C (wheel tracking tester). (5) was used and the wheel load was 100kgf at a rate of 0.5Hz.

    Every 500 cycles, the plastic strain settling of the asphalt specimen was measured and stopped at 2000 cycles.

Example 1.

The glass fiber roving yarn 1150 tex is used as one warp yarn, and the two warp yarns form one rib in the radial direction, and the 1150 tex is used as one weft yarn, and the two weft yarns use one rib in the upward direction. In addition to weaving to form, at the same time, the intersection of the warp and weft yarns are stitched into a single lennosic form by using a steep slope to form a lattice-like structure, and the gap between the ribs and the ribs, that is, the lattice The size was 16.5 x 16.5 mm.

The coating solution was added to the blown asphalt with 50% toluene soluble content, SBS 2% was added to make a modified bitumen by high-speed stirring at 180 ℃ for 2 hours, the heat treatment temperature during coating was 180 ℃.

One side of the coated geogrid was tackified with an acrylic emulsion of 50% solids and solidified at 160 ° C. for 2 minutes.

Table 1 shows the results of evaluating the radial, upward physical properties, crack resistance, and plastic deformation resistance of the geogrid thus prepared.

Example 2.

Weaving two weft yarns to form one rib in the upper direction using a glass fiber roving 2200 tex as a weft yarn, and manufactured a geogrid in the same manner as in Example 1, and the evaluation results are shown in Table 1.

Example 3.

The coating solution was prepared in the same manner as in Example 1 using only blown asphalt with 50% toluene soluble content without mixing the modified polymer compound, and the evaluation results are shown in Table 1.

Example 4.

A composite fabric was prepared by attaching a polypropylene needle-biased nonwoven fabric having a unit weight of 150 g / m ² to the geogrid prepared in Example 1, and the evaluation results are shown in Table 1.

Comparative Example 1.

The specimens were prepared without inserting the reinforcing material, and the evaluation and the results are shown in Table 1.

Comparative Example 2.

Two inclined yarns form one rib in the radial direction, with 2200 tex of fiberglass roving yarn as one warp yarn, and two weft yarns forming one rib in the upper direction with 2200 tex as one weft yarn. The distance between the ribs and the ribs, i.e., the lattice size was woven to 33.0 x 33.0 mm, was fabricated in the same manner as in Example 1, and the evaluation results are shown in Table 1.

Comparative Example 3.

Five warp yarns form one rib in the radial direction with 450 fiberglass roving yarns as one warp yarn, and five weft yarns form one rib in the upper direction with 450 texes as one weft yarn. Geogrid was prepared in the same manner as in Example 1, and the evaluation results are shown in Table 1.

Comparative Example 4.

Glass fiber geogrid was prepared without adhesive treatment on the coated geogrid prepared in Example 1, the evaluation results are shown in Table 1.

Comparative Example 5.

After weaving into plain weave using only fiberglass roving yarn without using an inclined yarn, geogrid was prepared in the same manner as in Example 1, and the evaluation results are shown in Table 1.

Comparative Example 6.

The polyester high-strength yarn 1500 denier yarn manufactured by the conventional method is combined to make 3000 denier, which is made of one warp and weft yarn, and four warp yarns form one rib in the radial direction. Weaving was done in plain weave to form one rib, so that the gap between the rib and the rib, i.e. the lattice size, was 16.5 * 16.5 mm.

The coating solution was mixed with 100 parts of polyvinyl chloride resin for paste, 60 parts of dioctylphthalate, a phthalic acid-based plasticizer, and mixed with a small amount of a thermal stabilizer, a viscosity control agent, and carbon black. The heat treatment temperature at the time was 180 degreeC.

<Table 1>

Item Radial strength (kN / m) Upward strength (kN / m) Longitudinal Elongation (%) Porosity (%) Fatigue Life (Number of Repeated Loads) (times) Plastic deformation settlement (mm) Example 1 6.2 6.3 3.0 64.3 37,000 0.3 Example 2 6.2 12.5 3.1 57.0 46,000 0.2 Example 3 6.2 6.2 3.2 64.3 30,000 0.6 Example 4 7.0 6.8 3.2 0 34,000 0.4 Comparative Example 1 - - - - 4,300 9.0 Comparative Example 2 6.0 6.1 3.0 73.2 16,000 2.4 Comparative Example 3 6.2 6.3 3.2 66.8 14,500 3.7 Comparative Example 4 6.1 6.2 3.0 64.3 13,000 3.8 Comparative Example 5 6.1 6.0 3.2 59.7 9,800 3.6 Comparative Example 6 6.3 6.3 12.8 70.0 6,000 6.7

Geogrid according to the present invention is excellent in adhesion to the road surface and construction workability, at the same time high fatigue life and plastic deformation resistance.

1 is a schematic view of a continuous manufacturing apparatus of reinforcing, repairing geogrid for pavement according to the present invention.

Figure 2a and Figure 2b is an illustration of the fabric structure of the geogrid for reinforcement, repairing pavement according to the present invention.

3 is a view illustrating a crack resistance test method related to the present invention.

4 is a diagram illustrating a plastic deformation resistance test method according to the present invention.

Claims (9)

Method for producing a geogrid for reinforcement, repairing pavement comprising the following steps of manufacturing. 1) feeding the glass fiber roving yarn from the creel to the loom with a uniform tension by the rotational movement of the delivery beam which is an automatic tension control device; 2) 2 to 4 radial fiberglass roving yarns forming one rib in the loom and 1 to 4 upward fiberglass roving yarns forming one rib so as to cross each other in a lattice shape. At the same time, the tilt of the intersection of the glass fiber roving yarn in the light and upward direction Weaving the geogrid by engaging in a leno weave form using; 3) coating both sides of the geogrid with a polymer coating material; 4) coating one side of the coated geogrid with a polymer adhesive; The method of manufacturing a geogrid for reinforcement and repair of a pavement according to claim 1, wherein the one or two blades are woven into single or double lenoits. The method of claim 1, wherein the grid size is 5 ~ 30mm reinforcement, pavement geogrid manufacturing method for the road. The method of claim 1, wherein the coating material is selected from bitumen to polymer modified blown asphalt. The method of claim 1, wherein the adhesive material is selected from an acrylic emulsion type or a solvent type having an adhesive strength of 300 to 900 gf. The method of claim 1, wherein the one or more selected from woven or non-woven fabric is bonded to one surface of the geogrid. Geogrid for reinforcement and repair of pavement made by the manufacturing method of claim 1. 8. The geogrid for reinforcement and repair of pavement according to claim 7, wherein the grid size is 5 to 30 mm. 8. The reinforcing and repairing geogrid of pavement according to claim 7, characterized in that one selected from woven or nonwoven fabric is bonded to one side.