EP-4741461-A2 - NON-VOLATILE ROOM-TEMPERATURE MODIFIED ASPHALT BINDER, NON-VOLATILE ROOM TEMPERATURE RECYCLED ASPHALT MIXTURE CONTAINING THE SAME, AND METHOD FOR REPAIRING POTHOLES AND CRACKS USING THE SAME

EP4741461A2EP 4741461 A2EP4741461 A2EP 4741461A2EP-4741461-A2

Abstract

Provided are a non-volatile room-temperature modified asphalt binder, a non-volatile room-temperature recycled asphalt mixture containing the same, and a method for repairing potholes and cracks using the same. The non-volatile room temperature recycled asphalt mixture according to an example embodiment has improved fluidity, which prevents the occurrence of cracks in existing asphalt, and has the advantages of improved delamination and thermal stability.

Inventors

PARK, JOUNG-HO
KIM, YOUNG-IK

Assignees

Hansoo Road Industry Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20251107

Claims (13)

A non-volatile room-temperature modified asphalt binder comprising: a) 0.1 to 30 wt% of petroleum asphalt selected from one or more of straight asphalt and blown asphalt; b) 0.1 to 30 wt% of natural asphalt selected from one or more of gilsonite, glance pitch, and grahamite; c) 0.1 to 15 wt% of rubber modification compound (RMC) polymer modifier, which is a vinyl aromatic hydrocarbon-conjugated diene block copolymer using one or more selected from styrene-butadiene block copolymer (SBS), styrene-isoprene block copolymer (SIS), and styrene-ethylene-butylene block copolymer (SEBS); d) 20 to 50 wt% of process oil selected from one or more of paraffin oil, naphthenic oil, aromatic oil, natural oil, and mineral oil; e) 0.5 to 30 wt% of adhesion enhancers selected from one of more of rosin ester-based, modified acrylic-based, modified silicone-based, polyvinyl ester-based, and silicone based resin; f) 2 to 5 wt% of crack inhibitors selected from one or more of polypropylene glycol and polyethylene glycol; g) 0.2 to 0.5 wt% of water-repellent additives selected from one or more of siloxane and silicone oil; h) 0.1 to 1wt% of carboxymethyl cellulose having a carboxylation degree of 0.5 to 1 and a Brookfield viscosity of 3000 to 4000 cps at 25°C; and i) 0.1 to 0.5 wt% of carbon nanotubes.
A non-volatile room-temperature recycled asphalt mixture comprising: 1 to 3 wt% of the non-volatile room-temperature modified asphalt binder; 93 to 97 wt% of recycled aggregate; 2 to 4 wt% of filler; and 0.5 to 2 wt% of graphene.
The non-volatile room-temperature recycled asphalt mixture of claim 2, wherein the non-volatile room-temperature recycled asphalt mixture is characterized by being applied to sidewalks, bicycle paths, or walking paths.
The non-volatile room-temperature recycled asphalt mixture of claim 2, wherein the non-volatile room-temperature recycled asphalt mixture is mixed and manufactured at room temperature.
A non-volatile room-temperature recycled asphalt pouch manufactured by putting the non-volatile recycled asphalt mixture according to claim 2 into a packaging container, wherein the non-volatile room-temperature recycled asphalt pouch is introduced into potholes and cracks.
The non-volatile room-temperature recycled asphalt pouch of claim 5, wherein the non-volatile room-temperature recycled asphalt pouch is introduced to potholes and cracks and then filled into the potholes and cracks by pressure from the tires of passing vehicles.
The non-volatile room-temperature recycled asphalt pouch of claim 5, wherein introducing the non-volatile room-temperature recycled asphalt pouches to the potholes and cracks involves introducing non-volatile room-temperature recycled asphalt pouches of different sizes depending on the size of the potholes and cracks as vehicles move.
The non-volatile room-temperature recycled asphalt pouch of claim 5, the packaging container is made of an elastic fabric.
The non-volatile room-temperature recycled asphalt pouch of claim 8, the elastic fabric comprises one or more selected from a group consisting of polyurethane, polyethylene, high-density polyethylene, nylon, and spandex.
A method for repairing potholes and cracks in a road surface, comprising the steps of: 1) operating a road maintenance vehicle to automatically detect potholes and cracks in the road surface; 2) introducing non-volatile room-temperature recycled asphalt pouches into the automatically detected potholes and cracks; and 3) compacting the non-volatile room-temperature recycled asphalt pouches that are placed in potholes and cracks by the tire pressure of vehicles traveling on the road.
The method for repairing potholes and cracks in a road surface of claim 10, wherein introducing the non-volatile room-temperature recycled asphalt pouches is introducing non-volatile room-temperature recycled asphalt pouches of different sizes depending on the size of the potholes and cracks.
The method for repairing potholes and cracks in a road surface of claim 10, wherein introducing the non-volatile room-temperature recycled asphalt pouch is performed automatically by a sensor or manually by a person.
The method for repairing potholes and cracks in a road surface of claim 12, wherein the sensor comprises a robot.

Description

TECHNICAL FIELD The following disclosure relates to a non-volatile room-temperature modified asphalt binder, a non-volatile room-temperature recycled asphalt mixture containing the same, and a method for repairing potholes and cracks using the same. BACKGROUND More than 90% of domestic road pavements are concrete or asphalt, but due to increased traffic and heavy vehicles, the durability and service life of roads are significantly deteriorating due to deformation and cracking. Localized heavy rains, heavy snowfall, global warming, etc. have caused road surface temperatures to rise and increased the use of calcium chloride, placing paved roads and sidewalks in much worse conditions than in the past, accelerating damage such as cracking, breakage, and wear. There are overlay methods and full- and partial-cutting overlay methods for repairing concrete or asphalt pavement, but these methods cause environmental problems and increased treatment costs due to the waste generated from crushing and cutting the existing pavement. In addition to the overlay method and the cutting overlay method mentioned above, room-temperature asphalt mixtures are used to repair asphalt pavement. Currently, the binders for room-temperature asphalt mixtures primarily include cutback asphalt containing volatile solvents or emulsified asphalt modified with an emulsifier. Specific examples of room-temperature asphalt mixtures are as follows: (a) to (e). (a) Room-temperature asphalt mixture using cement, fly ash, blast furnace slag powder, limestone, and early curing agent as inorganic binders with emulsified asphalt, modified emulsified asphalt binder (cationic, anionic, etc.), or cutback asphalt;(b) Room-temperature asphalt mixtures using polymer-modified additives, such as EVA, acrylic polymers, polyvinyl acetate, and acrylic emulsions, as well as surfactants and binders, with emulsified asphalt, modified emulsified asphalt binders (cationic, anionic, moisture vaporization type, etc.);(c) Room-temperature recycled asphalt mixture manufactured by mixing recycled aggregates with modified additives, recycled additives (vegetable oil, base oil, emulsion, non-heated water-based type, etc.) and fiber additives with emulsified asphalt or modified emulsified asphalt binder;(d) Room-temperature asphalt mixture manufactured by mixing a polymer-based binder (polyurethane, water-based polyacrylic binder, etc.) with aggregates;(e) Room-temperature asphalt binders manufactured by mixing straight asphalt, solvents, petroleum resins, colorants, crosslinking agents, etc., and room-temperature asphalt mixtures using these binders; The problems with conventional room-temperature asphalt binders or room-temperature asphalt mixtures are as follows. ① Problems with emulsified asphalt or modified emulsified asphalt-based room-temperature asphalt Emulsified asphalt refers to asphalt mixed with an emulsifier to prevent it from separating in water and maintain its dispersion. Water is added to asphalt, which is semi-solid at room-temperature, to maintain its liquid state at room-temperature, so its physical properties (penetration, softening point, peel resistance, moisture resistance, elongation, etc.) are inferior to those of straight asphalt. To overcome the above disadvantages of general emulsified asphalt, modified emulsified asphalt was manufactured and used by adding latex and rubber-based modifiers. Modified emulsified asphalt has greatly improved the above physical properties compared to general emulsified asphalt, but it does not satisfy the fundamental physical properties of asphalt binders. In other words, room-temperature asphalt mixtures using emulsified asphalt or modified emulsified asphalt do not have excellent mechanical properties such as Marshall stability, peel resistance, and indirect tensile strength. In order to improve the strength properties of emulsified asphalt and modified emulsified asphalt, inorganic binders are used in combination. In this case, although it is advantageous in terms of strength, it reduces the inherent ductility of asphalt, making it very vulnerable to fatigue and low-temperature cracking, requiring continuous maintenance. In addition, the use of inorganic binders such as cement poses a structural problem in that waste asphalt cannot be recycled after cutting for repaving. ② Problems with cutback asphalt-based room-temperature asphalt Asphalt cement, which is semi-solid at room-temperature, is mixed with a volatile petroleum solvent to make it liquid so that it can be used at room-temperature without heating. This is called cutback asphalt. Cutback asphalt varies in its evaporation, drying, and curing rates depending on the type of solvent mixed, and is classified into rapid-curing (RC), medium-curing (MC), and slow-curing (SC) types. Common solvents used in cutback asphalt include gasoline, kerosene, and diesel fuel. Cutback asphalt uses volatile solvents, which can reduce the mechanical properties of asphalt. In