KR101845653B1 - Constructing method for mastic asphalt lump composition for permanent repair - Google Patents

Abstract

The present invention relates to a method to construct a permanent repair type mastic asphalt lump composition for an emergency repair, capable of minimizing the height difference on a pavement surface unlike an existing temporary repair; thereby securing safety to vehicle property, reducing inconvenience to repeatedly repair a surface repaired by a temporary repair material with a permanent repair material in the future, reducing an economic loss to pay construction expenses twice, and reducing an accident likely to occur in pavement construction for emergency repair. According to the present invention, the method comprises: a step of manufacturing mastic asphalt through a melting and mixing device; a step of attaching powder including polymer with a glass transition temperature of 40 to 210°C on the outside to prevent the mastic asphalt from sticking; and a step of injecting the mastic asphalt on which the powder is attached into a pot hole.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for constructing a mastic asphalt block composition for permanent maintenance,

The present invention relates to a method of constructing a mastic asphalt block composition for emergency repair, particularly when applied to emergency repair when potholes on a concrete pavement surface are subjected to permanent maintenance, not temporary maintenance, The present invention relates to a method of constructing an asphalt concrete composition,

Asphalt concrete mixture (hereinafter referred to as "ascon mixture") is a mixture of asphalt and aggregate and is used for road pavement. Domestic roads generally consist of a base layer and an asphalt layer on a bedrock, or a layer of asphalt on concrete.

The asphalt pavement layer is divided into the middle layer and the surface layer, but the two layers of the asphalt layer are generally composed of two layers for good compaction and there is no difference in composition between the two layers. The porosity of the asphalt layer can vary depending on how much porosity is about 4% and how much is compaction using a roller.

The `gap` of this asphalt layer is a structure that water can penetrate, and the rainfall such as rainy season causes a partial pressure of the asphalt by applying a strong pressure to the gap by the pressing action of the wheel when the automobile is running. These partial departures are called "pot holes" and they can cause traffic accidents and cause major accidents depending on the size of the asphalt.

These portholes are more likely to occur in the bridge section because the bridge is made of concrete and the amount of asphalt of the surface layer asphalt layer on the bottom concrete of the bridge is as low as 4 to 5% For this reason, when rainfall rains in the rainy season, a large number of portholes will be generated, and traffic accidents will occur if the portholes are not quickly repaired. During the winter season, the water passing through the asphalt of the surface layer is frozen when a cold wave occurs, and the frozen moisture weakens the bonding force between the concrete and the surface layer asphalt, thereby generating a porthole.

Currently, there are two ways to repair domestic portholes. First, asphalt for patching is used. Patching asphalt is made by mixing asphalt and aggregate with process oil or light oil that is difficult to dry, so that the asphalt does not harden even at room temperature. The pavement asphalt is poured into a porthole and then passed through a swelling agent Of the wheels are used. This patching method should be permanently repaired in an appropriate manner after a few days or weeks in a `temporary 'repair method.

Secondly, it is a more sophisticated method to store the surface asphalt mixture produced in the asphalt mixture manufacturing plant by keeping it in a portable hot-air warming vehicle which is well-maintained, bringing it to the place where the porthole is generated, and pouring it. This repair method can be repaired permanently, but when the asphalt for surface layer is stored for a long time, the oil contained in the surface layer asphalt mixture may evaporate and may be transformed into a slippery asphalt mixture. In addition, it is difficult to maintain the heat for a long time, and when the temperature is lowered, it is difficult to complete repair due to poor compaction.

Portholes are directly related to traffic accidents and cause human accidents, and therefore must be repaired. In addition, maintenance should be repaired in the form of permanent remuneration instead of temporary remuneration to reduce economic losses. The present invention proposes a composition capable of easily repairing breakage such as a pontoon hole, a manufacturing method of the composition, and a construction method using the composition, thereby reducing traffic accidents or human accidents.

Unlike conventional asphalt mixtures, mastic asphalt mixtures are highly pumped asphalt mixtures with good fluidity and full waterproofness with magnetic leveling. However, in an asphalt mixture plant, it is manufactured at a high temperature of about 200 ° C or higher, and the asphalt mixture is delivered to the site using a device called `cooker` to construct it. The cooker consists of a heating device and a mixer as a kind of mobile heating mixer. The mastic asphalt mixture is produced in an asphalt plant and heated and stirred for about 1 to 2 hours to produce a mastic asphalt mixture.

Through this process, Mastic asphalt is produced and installed. The construction temperature is very high, about 220 ~ 260 ℃. Mastic Asphalt is a high quality packaging method used both on the surface and in the middle layer of asphalt pavement in overseas. However, due to the lack of slip resistance, it is currently used in the lower part of the surface layer of the asphalt pavement with a thickness of 3 to 4 cm in Korea, and is used as a waterproof layer, a crack prevention layer and an adhesive layer, and the surface layer and the lower layer of the upper layer are completely bonded It is an excellent material with excellent adhesion. However, since mastic asphalt is applied at a very high temperature, the water in the lower layer changes to water vapor when it comes into contact with water, and it may cause a blistering phenomenon that the surface of the mastic asphalt is swollen after paving.

Emergency repair work such as a porthole is often in a state where the concrete is completely wet after rain or when it stops raining. Therefore, when the mastic asphalt is used, it is possible to prevent deformation of the table surface in the wet surface, Adhesion between the asphalt and the lower surface can also be achieved well. Therefore, it is necessary to change the properties of such an asphalt mixture.

In addition, the use of cookers, a device for heating mastic asphalt, should be minimized. A common cooker unit is a large scale unit which melts and transports mastic asphalt of about 5 to 25 tons, but usually requires a volume of 30 to 50 liters for partial maintenance such as a porthole. Therefore, when such a cooker is used, the oil contained in the asphalt evaporates due to heating at a high temperature for a long time, and necessary workability is lost. Therefore, partial repair such as emergency repair requires a proper melting device rather than using a cooker, and it needs to be composed of components that can adhere well to the bottom even under rain conditions.

In order to suitably use mastic asphalt for repairing, the following manufacturing and construction methods are proposed: 1) mastic asphalt which can be applied in rainy weather is prepared and cured to a suitable size, 2) 3) It is a method to minimize the difference in the level of the broken part by pouring the required amount into the site using a continuous feeder.

This is illustrated by the conceptual diagram of FIG. For this purpose, 1) a composition of mastic asphalt which can be applied to a wet surface in rainy weather and can be easily melted should be prepared, and 2) a device capable of remelting already produced mastic asphalt should be constructed efficiently .

When applied to emergency repair such as a porthole by using the composition and the manufacturing apparatus of the mastic asphalt, the height difference of the packed pavement surface can be minimized unlike the existing temporary maintenance, thereby ensuring safe driving of the vehicle. In addition, it is possible to reduce the inconvenience of having to repair the surface with the temporary repair material, and to reduce the economic loss of paying the twice construction cost. It is also expected to be a remarkable repair method because it can reduce accidents that may occur in road pavement construction that the vehicle is running on.

In order to solve the above-mentioned problem, the present invention proposes a method of manufacturing a mastic asphalt, cooling it by subdividing the mastic asphalt into an appropriate size, and reusing it if necessary. The mastic asphalt mixture should be adhered on the wet surface unlike the conventional mastic asphalt mixture, and the high-temperature Mastic asphalt mixture should be applied to the surface to be repaired in an emergency It should not be adversely influenced by swelling caused by water vapor generated when swollen.

Mastic asphalt was modified to have excellent adhesion to the wet surface using conventional aggregate formulations, and it was recognized that there was a flow path of water vapor prior to asphalt hardening to prevent swelling due to the generated water vapor As a countermeasure for this, as a result of incorporating a water-hardening material such as a slaked lime or the like which can make use of a surfactant and water vapor to improve adhesion to a wet surface, it is possible to exhibit excellent adhesion on the wet side, And it is confirmed that permanent repair such as a porthole is possible because there is no bad influence of water absorption after curing.

The mastic asphalt composition of the present invention comprises 7 to 12% by weight of modified asphalt, 1 to 6% by weight of natural asphalt, 0.01 to 0.5% by weight of surfactant, 0.5 to 4% by weight of slaked lime, 12 to 32% 13 to 45% by weight, and 0.5 to 50.99% by weight of coarse aggregate of 13 mm or less (1 mm or more).

① Modified asphalt contains SBS rubber and PG grade 76-22 or 82-22 should be used. If other materials are used, the final physical property value should be separately designed to meet the standard. When the amount of the modified asphalt is less than 7 wt%, it is difficult to obtain the required workability and when the amount is more than 12 wt%, the plastic deformation easily occurs. The amount of the modified asphalt is preferably 7 to 10% by weight.

② Natural asphalt can use T.L.A (Trinidad lake asphalt) or ginsonite. If natural asphalt is not used, the PG grade 82-22 may be used. However, when the amount of natural asphalt is less than 1 wt%, plastic deformation due to summer heat may occur, and when it is larger than 6 wt%, cracks may occur in the winter season. The preferred amount is 2 to 6% by weight.

③ Surfactant may be either amine type or fatty acid type among the cationic surfactants, or a mixture of these two types may be used. In case of anionic surfactant, it is not suitable for use because it is likely to be eluted into water. When the amount of the anionic surfactant is less than 0.01 wt%, the asphalt mixture does not adhere to the wet surface in case of rain. have. The amount of the surfactant is preferably 0.05 to 0.3% by weight.

④ If you use less than 0.5% by weight of lime, 100 times of 100% of the lime should be used. If the amount is less than 0.5% by weight, it is difficult to stabilize by binding moisture present in the lower part during rain maintenance. If it exceeds 4% by weight, hardened mastic asphalt mixture This continuous hydroponic reaction can cause cracking. The amount of the slaked lime is preferably 1 to 3% by weight.

⑤ When the amount of filler is less than 12% by weight, a dense structure is not formed and the waterproofness is poor. When the amount is more than 32% by weight, workability may be drastically deteriorated. The preferred amount of filler is 14-30%.

⑥ The stones should be less than 5mm in diameter and not specified as granite. This is because all the domestic stones are produced in the process of producing concrete or asbestos coarse aggregate, and they are sold without being separated from crushed stones. If less than 13% by weight of the stearic acid is used, the granulation ratio is not suitable, and the porosity is increased, and the water resistance may be drastically deteriorated. If the stearic acid content is more than 45% by weight, the workability may be lowered. The preferred amount of the salt is 12 to 42% by weight.

⑦ In the case of coarse aggregate, it is 5 ~ 13 mm. However, in order to complete the present invention, the particle size distribution must be strictly observed. When it is smaller than 0.5% by weight, plastic deformation is easy. When it is larger than 50.99% by weight, asphalt flows, It can be easily broken. Details of this will be clearly defined through formulation standards and examples.

Meanwhile, the asphalt hot-melt waterproofing composition for road use using natural asphalt according to the present invention may further contain 2 to 3% by weight of pozzolan. Pozzolan is a natural mineral material such as Diatomite, which is responsible for discharging the toxicity of petrochemicals by anion release, deodorization effect and antibacterial action. Natural pozzolanic diatomaceous earth is a soft rock or clay deposited on the bottom of a sea or a lake, and more than 95% of it consists of a silica component and emits a large amount of far infrared rays, and has fine pores. When the pozzolan is less than 2% by weight, the cleaning effect is low, and when it is more than 3% by weight, the binding force is decreased.

And 3 to 4% by weight of wax or paraffin. The wax or paraffin has a melting point of 40 to 60 DEG C and serves to lower the production temperature of the asphalt, to melt the asphalt with chemical resistance, and to provide the effect of not being volatilized after the curing and not deteriorating the quality. When the wax or paraffin is added in an amount of less than 3% by weight, the effect of addition is scarcely added. When the amount of the wax or paraffin is more than 4% by weight, the brittleness of the asphalt increases and the product is easily broken.

The styrene thermoplastic elastomer may also be contained in an amount of 1 to 2% by weight. It has a hard segment of polystyrene block in the short term of the sock and a soft segment structure of polybutadiene in the middle. It has a low viscosity when it is dissolved in a mixed solvent and has high elasticity and low temperature durability. The synthetic zeolite powder dispersed in the particulate state exhibits a function of preventing cracking of the waterproof coating film caused by elapsing time and lifting of the waterproof coating caused by lack of low temperature durability during the winter season. The waterproof coating has the advantage of showing additional functions such as soundproofing and sound absorption

And 2.5 to 3.5% by weight of an amine-based curing agent. If the content of the amine-based curing agent is less than 2.5% by weight, the strength and durability may be lowered and the physical properties may be deteriorated. If the content of the amine-based curing agent is more than 3.5% by weight, the viscosity is increased and the workability is deteriorated.

And 1.5 to 3% by weight of an amorphous polyolefin. This amorphous polyolefin (APO) is a strong adhesive material added with olefins such as ethylene and propylene to lower the thermal conductivity of asphalt concrete during the summer season.

Further, it may further contain 0.5 to 0.7% by weight of iron slag. This iron slag is a slag generated when refining steel and scrap in an electric furnace to produce steel, preventing plastic deformation of the asphalt concrete, preventing the port hole on the pavement, preventing slip of the road Feature. When the content of the iron slag is less than 0.5% by weight, the effect thereof is not high. When the content of the iron slag is more than 0.7% by weight, the increase in the effect is insignificant.

The present invention provides a permanent repair mastic asphalt composition, method of manufacture, and construction method using the same, wherein the presently used maintenance can be repaired permanently even when weather conditions such as rainfall are very bad, It is possible to reduce the occurrence of traffic accidents due to the fact that the level difference of the surface is not negligible and the vehicle can not be wobbled. In addition, since the adhesion force penetrates into the tacked and dropped part, It is expected that the economic effect will be enormous.

FIG. 1 is a photograph showing the integration of a mastic asphalt sample with a surface layer and a construction photograph;
FIG. 2 is a conceptual view illustrating a mastic asphalt block manufacturing process of the present invention; FIG.
Figure 3 is a mastic asphalt round mass photograph according to the present invention;
Figure 4 is a photograph of the flow test of MEL asphalt of a mastic asphalt according to the present invention;
5 is a photograph of the penetration test of mastic asphalt according to the present invention; And,
6 is a photograph of the adhesion strength test of mastic asphalt according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail.

As a special method of the present invention, a mastic asphalt mixture is prepared so that it does not adhere to each other. Subsequently, it is subdivided into an appropriate size, and it is cooled well to prepare a re-melting easily. Usually, mastic asphalt consists of a specific mixture. When they are hardened and stored for a long time, they stick to each other easily due to the stickiness of the asphalt, and it takes a lot of time and heat when re-melting. However, the present invention does not adhere to the above-mentioned drawbacks, and it can be evenly cooled to a proper size, sealed and stored in a turtle, and heated and melted quickly when required.

The manufacturing method is divided into two steps. The first step includes preparing the mastic asphalt through the melting and mixing apparatus, and the second step includes the steps of causing the powdered mastic asphalt to adhere to the exterior of the mastic asphalt so that the mastic asphalt is not adhered to each other and packaging the same. The powder used herein is a polymer suitable, and as the polymer, any of the thermoplastic resins may be used, but the glass transition temperature should be 40 to 210 占 폚. If the glass transition temperature is lower than 40 ° C, the mastic asphalt mixture may adversely affect the asphalt pavement during the summer phase. If the glass transition temperature is higher than 210 ° C, the mastic asphalt mixture may serve as a filler in the mastic asphalt mixture. It is also possible to use inexpensive waste powder such as calcium carbonate, slaked lime, fly ash and slag, but these can be used as a part of the filler in the entire formulation.

The first stage consists of a heating mixer, extruder and chiller which are commonly used. The heating and mixing apparatus should be able to raise the heating temperature to 20 to 260 ° C. As a heating medium, there may be a direct heating method using fossil fuels such as LNG and LPG. However, since the heating plate is heated too much to cause carbonization of the internal material, it is not preferable. However, It can be used when there is a structure. On the other hand, the indirect heating method using the heating medium inside can prevent the carbonization of the internal material, but the heating time may be somewhat slow. The most convenient method is the method using hot wire and it can be a great advantage because it can be heated within the accurate temperature range when hot wire is used.

The heating and mixing apparatus should be equipped with a heating tank and a heater, a temperature sensor and a controller as shown in the conceptual diagram of FIG. The heating system should be constructed so that the molten mastic asphalt can be exported to the outside, and the mastic asphalt is extruded through the extruder in a certain form. The extruded mastic asphalt forms a certain shape through a suitable shape such as a triangle, a square, a circle, and the like, and the discharge port can be made to this shape. However, in the case of the circular outlet, the discharged mastic asphalt forms a circular rod shape, which is convenient to handle. The size of the aggregate is closely related to the size of the coarse aggregate and is preferably larger than the aggregate size by 30% or more. If it is smaller than a lot of coarse material, it may cause clogging of the mastic asphalt mixture frequently. If the size of one side or the diameter is larger than 100 mm, it is heavy and difficult to handle. The length of the specimen is preferably a size that can be handled by a person, and it is generally preferable that the length does not exceed 30 cm.

Finally, the discharged mastic asphalt is cooled down to room temperature while the powdery material adheres to the surface while descending down the inclined surface in the path to be introduced into the cooling device. Thus, the material of the present invention is completed. The mass of the mastic asphalt mixture of the present invention thus produced is melted through reheating and melting, and when the remelted mastic asphalt is used to treat potholes such as potholes, the change of the physical properties compared to the original asphalt None were identified.

Table 1 is a formulation table of mastic asphalt for the examples. The mastic asphalt prepared in the formulations of the Examples is remelted after being made into a cylindrical form and then melted through the above-mentioned manufacturing process, and is made into a specimen, and the physical properties of mastic asphalt, such as flowability, dynamic stability, Strength, and other properties, and proved that there is no change in physical properties.

※ Only modified asphalt is asphalt binder of SK's PG grade 82-22 and T.L.A is used as natural asphalt. The surfactant used was a Gripper from G company in Japan. The slaked lime was made of domestic white light. The filler was calcium carbonate of domestically manufactured product having an average particle diameter of 38 to 45 μm. Example 2 A normal-temperature asphalt repair agent of domestic company S was used.

FIG. 3 is a conceptual diagram of a mastic asphalt mixture round mass produced by the present invention, and FIG. 4 is a photograph of a fluidity test of a remelted mastic asphalt mixture. FIG. 5 is a photograph of the dynamic stability test of a mastic asphalt mixture. As shown in the figure, there is no difference in dynamic stability values between the remelted sample and the comparative sample. Fig. 6 is a photograph of the adhesion strength test of the remelted mastic asphalt mixture. It can be seen that there is a very strong adhesion force due to fracture at the attachment surface without falling off the attachment surface.

The results of physical properties test are shown in Table 2. In order to determine the workability of the flow, the flow rate of the ULE liquidity test was measured by filling the standardized vessel with the sample taken from the laboratory or the field as shown in the photograph. The 995g weight with the scale was inserted into the vessel, The time required for intrusion is checked in sec. However, the temperature range of the mixture should be in the range of 200 ~ 260 ℃. In this case, the weight does not fall between the aggregates due to its own weight, but it measures the time of additional sinking that has already been buried. The penetration test is a test to measure the stability of the mixture. The specimen is taken from the laboratory or field and the specimen is prepared without the mold (7 * 7 * 7 cm).

After immersing the specimens at 40 ° C for 1 hour, the load of 52.5 kg was loaded for 30 minutes as shown in the photograph, and the penetration depth was measured to be 1 to 4 mm. First of all, the fluidity test, which is a measure of workability, satisfied 3 ~ 20 seconds and the dynamic stability exceeded the minimum value of 300ghl / mm. The penetration resistance also satisfied 1 to 4 mm in both the comparative example and the example. However, in the case of the emergency repair, the adhesive force on the wet side was 1.5 and 1.6 in the case of Examples, whereas in Comparative Examples 1 and 2, It should be installed only in the state. On the other hand, the present invention confirmed that it is possible to construct immediately after bad weather such as rain.

Claims (4)

Preparing a mastic asphalt through a melting and mixing apparatus;
Attaching a powder comprising a polymer having a glass transition temperature of 40 to 210 DEG C to the outside so that the mastic asphalt does not adhere to each other; And
Injecting the mastic asphalt having the powder attached thereto into a porthole;
Lt; / RTI >
The mastic asphalt is uniformly cooled to a predetermined size, sealed and stored in a bag, placed through a reheat melting process,
The mastic asphalt comprises: 7 to 12 wt.% Modified asphalt; 1 to 6% by weight of natural asphalt; 0.01 to 0.5% by weight of a surfactant; 0.5 to 4 wt% of slaked lime; 12 to 32% by weight filler; 13 to 45% by weight of an abrasive; 0.5 to 50.99% by weight of coarse aggregate of 13 mm or less,
Wherein the natural asphalt comprises Trinidad lake asphalt (TLA) or gilsonite, and the surfactant comprises one of an amine type and a fatty acid type,
Wherein the mastic asphalt comprises 2 to 3% by weight of pozzolan, 3 to 4% by weight of wax or paraffin, 1 to 2% by weight of a styrene thermoplastic elastomer, 2.5 to 3.5% by weight of an amine curing agent, 1.5 to 3% by weight of an amorphous polyolefin, And 0.5 to 0.7% by weight of iron slag, based on the total weight of the asphalt composition. delete delete delete

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