KR101138875B1 - Method of constructing asphalt using rubberized asphalt self-adhesion type waterproof sheet - Google Patents

Abstract

The present invention provides a construction method for preventing cracks in construction joints (cold joints) generated when asphalt paving using rubberized asphalt-based self-adhesive sheet. Rubberized asphalt-based self-adhesive sheet according to the present invention is basically excellent in waterproofing, crack tracking, low temperature flexibility to block moisture, excellent adhesive strength possessed by the self-adhesive sheet itself to reduce the durability of the asphalt pavement Construction on the joint site can contribute to the extension of the life of the asphalt pavement.

Description

Method of constructing asphalt using rubberized asphalt self-adhesion type waterproof sheet}

The present invention relates to a construction method of asphalt using a soft rubberized asphalt-based self-adhesive sheet.

Asphalt pavement, which accounts for about 80% of the road pavement in Korea, has advantages such as rapid traffic opening and ease of maintenance, while occurring in permanent deformation rutting, cracking due to environmental impact, and construction process. There are many inherent disadvantages such as joint cracks due to joints. In the meantime, studies on reducing plastic deformation have been continuously made through the development of asphalt modifier and the improvement of aggregate particle size, while the study of cracks is relatively inadequate in Korea.

Recently, road pavement work is increasing due to the rapid increase of environmental conditions and traffic volume, but it is first laid and pavement pavement (previous ascon layer) during the construction of asphalt pavement expansion and repair method using cutting overlay method. Then, a cold joint is generated between the laid and compacted pavement (melted ascon layer).

These construction joints are the joints where the already-packed surface and the newly-packed surface are bonded. Early cracking occurs due to the adhesion failure of new and old packaging within a short period of time, and rainwater penetrates into the crack during rainfall. Gradually enlarged cracks lead to labeling, peeling and pothole generation, leading to reduced durability and longevity of the packaging layer.

Therefore, there is an urgent need for a preventive material capable of suppressing the expansion of construction joint cracks by absorbing the load and impact of the vehicle and the perfect adhesion and waterproofness of construction joints generated during asphalt pavement.

For example, in Korea, it is not possible to fundamentally solve the problem of cracks in construction joints in the longitudinal direction of asphalt pavement, and cracks are generated at the joints after one or two years after the asphalt concrete pavement. It is sealed with an asphalt binder but is only a temporary prescription, not a permanent method.

In addition, Patent Literature 1 discloses 40 to 60 wt% of vulcanized asphalt asphalt, 3 to 15 wt% of special rubbers, 3 to 15 wt% of special minerals, 3 to 15 wt% of fillers, 12 to 30 wt% of glass fibers, and 18 to 18 solvents. 28wt%, 0.1 ~ 3wt% of UV stabilizer, 0.1 ~ 1wt% of antioxidant, and apply it as if it is plastered by brush, spatula, etc., or spray it on road joint by laying part installed integrally with finisher A construction method is disclosed.

However, referring to Figure 1, the composition used in the construction method is applied in a thickness of 3 ~ 5mm to the junction (C) where the adhesion between the surface (A) already packaged and the newly packaged surface (H), The composition containing the solvent component requires a long time until fully cured, and the solvent component may cause the aggregate and the asphalt binder to peel off from the existing asphalt mixture or the new asphalt mixture, thereby further expanding the construction joint crack.

In addition, the composition described in the patent described only the contents related to the adhesion of the old and new packaging, the moisture does not accommodate the contraction / expansion of the pavement generated by the construction joint (cold joint) (C) and the load and impact of the vehicle Penetration can cause cracks that can cause serious problems such as damage to the pavement. In addition, in the construction method between the surface (A) and the newly packaged surface (B) is described as applying with a brush or spatula, there is a problem in forming a constant thickness.

On the other hand, in the United States, the asphalt joint finisher (F), which can be used to pack more than two secondary pavings, is used in one batch, or the hot joint method using two finishers (F) solves the construction joint problem. have. Cracks caused by longitudinal cold joints (C) caused by laying asphalt mixture in one lane use the same sealing method as in Korea, but this also prevents only penetration by rain (rainwater), but also cracks followability and load on the vehicle. It does not absorb excessive shocks and cannot be a permanent solution.

In addition, in Europe, as in the United States, an overlay of one lane is avoided as much as possible, and a method of simultaneously laying two lanes is used.

Patent Document 1: Korean Patent No. 10-0552470

Therefore, in the present invention, the crack tracking property and low temperature flexibility are excellent, and the bonding method of the existing ascon layer and the newly wrapped ascon layer joint is not the adhesive method using heat fusion or an adhesive but using the adhesive property possessed by the self-adhesive sheet itself. When leaking with the non-fused / non-heated adhesive method, the leakage problem for the most frequent joints was fundamentally solved using the rubberized asphalt-based self-adhesive sheet.

Accordingly, an object of the present invention is to provide a construction method using the rubberized asphalt-based self-adhesive sheet capable of shortening the construction process by using the rubberized asphalt-based self-adhesive sheet can reduce the air shortage, work stability, construction cost.

Asphalt construction method using a rubberized asphalt self-supporting waterproof sheet according to the present invention for achieving the above object:

Removing foreign matter from the vertical surface of the existing ascon layer joint;

Applying and curing an asphalt primer on the joint vertical surface;

30 to 70% by weight of asphalt on the vertical surface of the joint to which the primer is applied; 1 to 30% by weight of styrenic block copolymer; 70 ~ 80% by weight of the mixture of hydrogenated lubricating base oil and 20 ~ 30% by weight of additives consisting of pour point lowering agent and viscosity index improver. Synthetic oil with pour point -60 ℃, viscosity index (25 ℃) 200cp, flash point 0.5-20 wt% of paraffinic viscoelastic synthetic oil having a temperature of 250 ° C. or higher; Petroleum resin 0.5-20 wt%; And attaching a rubberized asphalt-based self-adhesive sheet comprising 5 to 20% by weight of polybutene having physical properties of viscosity index (100 ° C.) 230 cps, flash point 190 ° C., and pour point −10 ° C .; And

After attaching the sheet, the step of laying a molten ascon layer.

In the asphalt construction method of the present invention, the rubberized asphalt-based self-adhesive sheet thickness is 2 to 4 mm.

In the asphalt construction method of the present invention, the rubberized asphalt-based self-adhesive sheet thickness further comprises 0.5 to 5% by weight of each additive selected from the group consisting of antioxidants, light stabilizers and thermal stabilizers. do.

The present invention, after attaching the rubberized asphalt-based self-adhesive sheet to the vertical surface of the existing ascon layer joint excavated, laying molten ascon to maintain and improve the adhesive strength of the construction joint (cold joint), and to block moisture by rain By preventing the occurrence of cracks in the construction joint (cold joint) generated during pavement, it is effective to extend the life of the pavement, and to reduce the maintenance cost of the pavement.

In addition, the present invention is a non-fusion / non-heated adhesive method to be attached using the adhesiveness of the self-adhesive sheet itself, not the heat-sealing or adhesive method using an adhesive, the construction is simple, and the working time is required even without a professional technician Since it is shortened, there are many effects that can improve the quality of the pavement.

Figure 1a is a plan view schematically showing a construction joint (cold joint) generated when asphalt concrete pavement.
1B is a cross-sectional view schematically showing a construction joint (cold joint) generated when asphalt concrete pavement.
2 is a schematic view of the rubberized asphalt-based self-adhesive sheet according to the present invention.
Figure 3a to 3d is a process diagram schematically showing the sequence of construction on the construction joint (cold joint) site generated when asphalt concrete pavement using the rubberized asphalt-based self-adhesive sheet according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

As described above, referring to FIGS. 1A and 1B, the joint (construction joint) C, in which the existing paved surface A and the newly paved surface H, of the asphalt is adhered, has a structure of new packaging within a short period of time. Premature cracking occurs due to adhesive failure, and rainwater penetrates into the crack during rainfall, and the crack gradually expands due to the load of the vehicle, which leads to labeling, peeling, and porthole generation, resulting in reduced durability and longevity of the pavement layer. do.

Therefore, in the present invention, by attaching a rubberized asphalt self-supporting sheet to the vertical surface of the existing ascon layer joint excavated during the expansion and cutting overlay of asphalt pavement, and by installing a melted ascon layer, perfect adhesion and waterproofness of the old and new paving Provides a preventive construction method that can absorb the load and impact and can suppress the expansion of construction joint cracks.

The rubberized asphalt-based self-adhesive sheet, as shown in Figure 2, the rubberized asphalt-based self-adhesive composition and the release paper of the present invention can be used commercially laminated structure on the release paper coated with a silicone resin sequentially. .

The construction method of the present invention includes a washing step of removing foreign matter from the vertical surface of the joint of the existing ascon layer excavated; Applying an asphalt primer to the joint vertical surface to cure; Attaching a rubberized asphalt self-adhesive sheet to a vertical surface of the joint to which the primer is applied; And laying the molten ascon layer after treating the sheet. Looking at each step as follows.

1. Cleaning step to remove foreign substances from the vertical surface of the existing asphalt concrete joint

Referring to Figure 3a, by suction cleaning and cleaning the foreign matter, such as dirt, dust on the joint vertical surface of the conventional ascon layer (A), it is cleaned by using a vacuum suction device to maintain a dry state.

2. Applying Asphalt Primer and Curing

Referring to Figure 3b, in order to smooth the surface of the joint vertical surface of the conventional ascon layer (A) and to increase the adhesion with the rubberized asphalt-based self-adhesive sheet is applied asphalt primer (P) by about 0.2 ~ 0.3l per m 2 .

3. Attaching rubberized asphalt self-adhesive sheet

Referring to Figure 3c, the rubberized asphalt-based self-adhesive sheet (S) is attached to the joint vertical surface to which the asphalt primer is applied.

The rubberized asphalt-based self-adhesive sheet (S) optionally mixes asphalt, styrene-based block copolymers, paraffinic viscoelastic synthetic oils, petroleum resins and polybutenes with weatherable additives such as antioxidants, heat stabilizers and / or light stabilizers. It is manufactured by using the non-fused / non-heated adhesive method because it is excellent in crack tracking, heat resistance and low temperature characteristics, and it can fundamentally solve the problem of leakage for the most frequent joints.

In the present invention, the asphalt constituting the preferred rubberized asphalt-based self-adhesive sheet has a softening point of 30 to 100 ° C. and a penetration of 30 to 175 dmm in terms of good compatibility with ascon and good adhesion. It is very preferable that the softening point is 50-70 degreeC and penetration is 50-90dmm.

The amount of the asphalt used is preferably 30 to 70% by weight, and less than 30% by weight results in poor adhesion due to less content. When it exceeds 70% by weight, strength and adhesive strength are increased, but low temperature brittleness is increased and elasticity disappears. Tends to get worse.

The rubberized asphalt-based self-adhesive sheet according to the present invention must not only increase the softening point but also increase the elasticity to prevent permanent deformation at high temperatures and cracking at low temperatures. Therefore, the rubberized asphalt-based self-adhesive sheet of the present invention includes a styrene block copolymer in order to increase elasticity and heat resistance. The styrene-based block copolymer forms a network with asphalt to improve the interfacial adhesion to increase the elasticity and heat resistance of the sheet, and the increase in elasticity and heat resistance may cause deformation and cracking at high temperatures and external shocks. Can be significantly improved.

As for content of the styrene-type block copolymer contained in the sheet | seat of this invention, 1-30 weight% is preferable. If the content of the styrenic block copolymer is less than 1% by weight, the elasticity and heat resistance of the sheet are hardly improved. If the content of the styrenic block copolymer is more than 30% by weight, the adhesive force of the sheet is lowered and a high viscosity is obtained.

According to the present invention, the styrenic block copolymer is completely dispersed in the asphalt matrix by high-speed mixing by a high shear mixer or the like at a high temperature (180 ° C) to form a special type of network structure, and the content thereof As this increases, elasticity and mechanical strength increase, but it is more preferable to add 1 to 15% by weight because it is relatively expensive compared to asphalt. On the other hand, the form of the product is preferred because the powder form has a short dissolution time advantage.

In the present invention, paraffinic viscoelastic synthetic oil is used as a plasticizer or softener. The paraffinic viscoelastic synthetic oil is a synthetic oil synthesized by adding a pour point lowering agent and a viscosity index improver 20-30 wt% as an additive to a mixture of 70-80 wt% of a hydrogenated lubricated base oil. Viscosity index (25 ℃) has a characteristic of 200cp, flash point of 250 ℃ or more. Here, the mixing ratio of the pour point lowering agent and the viscosity index improver may be mixed in a weight ratio of 1: 9 to 9: 1, and preferably in a weight ratio of 1: 1.

When the paraffin-based viscoelastic synthetic oil is added to the rubberized asphalt-based self-adhesive sheet of the present invention constituting the present invention, normal temperature adhesion is maintained even in summer, and has flexibility to maintain flexibility at low temperatures in winter.

In addition, the amount of the paraffinic viscoelastic synthetic oil added to the rubberized asphalt-based self-adhesive sheet constituting the present invention is preferably 0.5 to 20% by weight, and less than 0.5% by weight has almost no additive effect, and exceeds 20% by weight. There is a tendency for the plasticization of the lower surface to oxidize the base surface of the ascon structure, which is the adhesive surface.

On the other hand, the petroleum resin used in the rubberized asphalt-based self-adhesive sheet of the present invention serves as a tackifying agent, aromatic petroleum resin, coumarone indene resin, aliphatic petroleum resin, hydrogenated dicyclopentadiene-based At least one selected from hydrocarbon resin or petroleum resin such as hydrogenated dicyclopentadiene hydrocarbon resin can be used. In particular, it is most preferable to use the hydrogenated dicyclopentadiene type resin which is excellent in adhesive force and low brittleness.

If the content of the petroleum resin is 0.5 to 20% by weight, the content is less than 0.5% by weight is almost no additive effect, if the content exceeds 20% by weight there is a problem that the elasticity of the composition is lowered and low temperature brittleness occurs.

In addition, the rubberized asphalt-based self-adhesive sheet of the present invention is added to 5 ~ 20% by weight of polybutene having physical properties of viscosity index (100 ℃) 230cp, flash point 190 ℃, pour point -10 ℃ to increase the adhesive strength of the sheet itself It is desirable to. If the content of polybutene is less than 5% by weight, it is difficult to achieve the desired purpose due to the slight increase in adhesive strength of the sheet. If the content is more than 20% by weight, the softening point and elasticity of the sheet are reduced to lower the heat resistance.

In addition, an antioxidant, a light stabilizer (ultraviolet absorber or HALS-based light stabilizer), a heat stabilizer, etc. may be further added to the rubberized asphalt-based self-adhesive sheet of the present invention. Each preferable addition amount of these is 0.5 to 5 weight%. It was confirmed that when the content of the other additives was less than 0.5% by weight, a change in the physical properties of the sheet and cracks occurred on the surface when repeated heating and exposure to ultraviolet rays were performed by repeated experiments. Since the unit price is high, the unit price of the sheet becomes high, resulting in a phenomenon that the competitiveness is lowered.

Rubberized self-adhesive sheet in the present invention can be produced regardless of the type and mixing order of the mixer, such as impeller mixer, high shear mixer. It is preferable here to use a high shear or high viscosity mixer in order to obtain a more uniformly dispersed composition of the respective components and to mix them in a shorter time.

According to a preferred embodiment of the present invention, first, a styrene block copolymer and paraffin-based viscoelastic synthetic oil are added to the asphalt and stirred at about 180 ° C. Optionally, various small amounts of additives can be added. As such, the reason why the asphalt, the styrene block copolymer and the paraffinic viscoelastic synthetic oil is mixed first is that the paraffinic viscoelastic synthetic oil gives a plasticizing effect to the asphalt and the styrene block copolymer so that it is more uniformly dispersed. This is because it exhibits low temperature flexibility.

Then, polybutene, petroleum resin, and other weathering additives are added to the mixture and stirred at a temperature of 150 ° C. to homogenize to prepare a rubberized asphalt-based self-adhesive sheet constituting the present invention.

According to the present invention, it is preferable that the thickness of the rubberized asphalt-based self-adhesive sheet is 2 to 4 mm, and if it is less than 2 mm, the rubberized asphalt self-adhesive by the aggregate contained in the ascon layer when laying the molten ascon layer. As the sheet is damaged, it can not prevent the perfect adhesion and waterproofness of old and new packaging, and it can't absorb the load and impact of the vehicle, preventing expansion of construction joint cracks. The construction joint (cold joint) to which the sheet is applied becomes thick, causing weakening of the shear stress of the adhesive surface of the new and old packaging layers, which tends to cause separation of the new and old packaging layers.

4. Step of laying molten ascon layer

After attaching the rubberized asphalt-based self-adhesive sheet S, the molten ascon layer H is laid and compacted using a compactor in a conventional manner.

Hereinafter, the construction method according to the present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited thereto.

Manufacture example 1

Hydrogenated Lubricant Base Oil (Korea Ultra Chemtech Co., Ltd., S-3300, Cas No. 64741-88-44) 40 wt% and other Hydrogenated Lubricant Base Oil (Korea Ultra Chemtech Co., Ltd., S-9500, Cas No. 64742-65-0) Pour point lowering agent (35% by weight of mixed lubricant base oil) Korea Ultra Chemtech Co., Ltd. Condensate of chlorinated paraffin and phenol, Cas No. N / A and viscosity index improver Korean Ultra Chemtech manufacturer, olefin copolymer, Cas No. N / A) was mixed at a weight ratio of 1: 1 to synthesize 25% by weight to prepare a paraffinic viscoelastic synthetic oil. The pour point of the paraffinic viscoelastic synthetic oil was -60 ° C, the viscosity index (25 ° C) was 200cp, and the flash point was 265 ° C.

Manufacture example 2

5 wt% of paraffin-based viscoelastic synthetic oil obtained in Preparation Example 1 and 10 wt% of styrene-based block copolymer (Kumho Petrochemical, KTR 401P) in 60 wt% of AP-5 (SK energy), an asphalt having a penetration of about 50 dmm. % Was added and stirred at 600 rpm for about 3 hours at 180 ° C, 15% by weight of polybutene (Daelim Industry, PB450), 9% by weight of petroleum resin (Koloon Oil, SU-120), and antioxidant (SONGNOX 210B) 1% by weight was added and stirred at 600 rpm for about 1 hour at 150 ° C to homogenize.

Example 1

The composition obtained in Preparation Example 2 was melted at about 100 to 120 ° C. with an extruder equipped with a heating device, and then extruded into a thickness of about 2 mm and a width of 100 cm through a T-die of the extruder, The coated release paper and the release paper were laminated on the upper and lower parts with a three-stage laminate roller apparatus. The sheet coming out through the three-stage laminate roller apparatus is cooled by a cooling roller, and then manufactured by finishing rolling the cooled rubberized asphalt-based self-adhesive sheet using a winding machine.

The finished rolled sheet is rolled while cutting to a size of 5 cm or 10 cm in width by using a rewinder to which a cutting device is attached to produce a rubberized asphalt-based self-adhesive sheet.

The physical property test results of the rubberized asphalt self-adhesive sheet thus prepared are shown in Tables 1 to 2 below.

Test result value of the present invention (crack traceability, heat resistance, low temperature characteristics) Test Items Result value Reference value (ASTM D 6690 Type) Test Methods Cone penetration (dmm) 45 90 or less ASTM D 5 Flowability (mm) 0.2 3 or less ASTM D 5329 Low Temperature Adhesive (-29 ℃, 3cycles) clear No problem ASTM D 5329 Asphalt Compatibility clear No problem ASTM D 5329 Recovery rate (%) 63 60 or more ASTM D 5329 Low Temperature Flexibility (-23 ℃) clear No problem ASTM D 5329

Test result value of the present invention (adhesive performance) Test Items unit Reference value (KS F 4932) Results Test Methods
Tensile adhesiveness burglar -20 ° C ㎏f / ㎠
12 or more 18 KS F 4932 20 ℃ 6 or more 8.0 KS F 4932
Shear adhesive

burglar -20 ° C ㎏f / ㎠
8 or more 13 KS F 4932 20 ℃ 1.5 or more 3.5 KS F 4932 Elongation -20 ° C %
0.5 or more 1.0 KS F 4932 20 ℃ 1.0 or higher 3.0 KS F 4932

Example 2

As shown in Figure 3a, by applying an asphalt primer (Pat Industries) at about 0.3L per vertical surface (height: about 40mm) of the conventional ascon layer joint excavated in the "b" shape and cured at room temperature, in Example 1 The obtained rubberized asphalt-based self-adhesive sheet was attached, a molten ascon layer was laid, and then compacted with a compactor to prepare an asphalt specimen. The specimen was cut to a size of 750 × 500 × 80 mm so that the vertical plane (construction joint) was located at the center, and then the self-adhesion performance and the water resistance were measured, and the results are shown in Table 3 below.

Test result value of the present invention (self-adhesive performance and waterproof) Test Items Reference value (KS F 4934) Results Test Methods Junction Stable Performance
Hydrostatic pressure performance Not pitched clear KS F 4934 Peel Resistance (N / mm) 1.5 or more 2.4 KS F 4934 Peel-Out, N / mm 1.5 or more 1.9 KS F 4934

As can be seen from Tables 1 to 3 above, the rubberized asphalt-based self-adhesive sheet used in the present invention is adhered to the vertical surface of the excavated asphalt concrete joint used by the present invention by completely satisfying crack tracking, adhesiveness, low temperature flexibility, heat resistance, and water resistance. After paving the molten ascon, the adhesive strength of the construction joint (cold joint) part is maintained and improved, and the moisture is prevented by rainwater to prevent cracking in the construction joint (cold joint) generated during asphalt pavement. It has the effect of extending the service life and reducing the maintenance cost of the pavement.

In addition, the present invention is a non-fusion / non-heated adhesive method to be attached using the adhesiveness of the self-adhesive sheet itself, not the heat-sealing or adhesive method using an adhesive, the construction is simple, and the working time is required even without a professional technician Since it is shortened, there are many effects that can improve the quality of the pavement.

10 and 12: release paper
11 and S: rubberized asphalt self-supporting sheet
A: Cold asphalt concrete pavement or conventional paved cotton
F: Finisher
H: Hot mix asphalt concrete pavement or freshly packed cotton
T: compaction equipment C: cold longitudinal joint
P: asphalt primer

Claims (3)

Removing foreign matter from the vertical surface of the existing ascon layer joint;
Applying and curing an asphalt primer on the joint vertical surface;
30 to 70% by weight of asphalt on the vertical surface of the joint to which the primer is applied; 1 to 30% by weight of styrenic block copolymer; 70 ~ 80% by weight of the mixture of hydrogenated lubricating base oil and 20 ~ 30% by weight of additives consisting of pour point lowering agent and viscosity index improver. Synthetic oil with pour point -60 ℃, viscosity index (25 ℃) 200cp, flash point 0.5-20 wt% of paraffinic viscoelastic synthetic oil having a temperature of 250 ° C. or higher; Petroleum resin 0.5-20 wt%; And attaching a rubberized asphalt-based self-adhesive sheet comprising 5 to 20% by weight of polybutene having physical properties of viscosity index (100 ° C.) 230 cps, flash point 190 ° C., and pour point −10 ° C .; And
After attaching the sheet, the asphalt construction method using the rubberized asphalt-based self-adhesive waterproof sheet comprising the step of laying a molten ascon layer.
The method according to claim 1,
The rubberized asphalt-based self-adhesive sheet thickness is 2 to 4 mm, the construction method of asphalt using the rubberized asphalt-based self-adhesive sheet.
The method according to claim 1,
The rubberized asphalt-based self-adhesive sheet thickness of the rubberized asphalt-based self-adhesive waterproof sheet further comprises 0.5 to 5% by weight of each additive selected from the group consisting of antioxidants, light stabilizers and thermal stabilizers. Construction method of used asphalt.

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