KR102222058B1 - Sand mastic asphalt mixture and construction method thereof - Google Patents

Abstract

The present invention relates to a sand mastic asphalt mixture and a construction method thereof. More particularly, the present invention is composed of 10 to 30 wt% of a sand mastic binder, 5 to 35 wt% of aggregate of 4.75 to 10 mm, 45 to 80 wt% of sand of 0.075 to 4.75 mm, and 1 to 24 wt% of a filler of 0.075 mm or less. Therefore, the sand mastic asphalt mixture is easily produced by measuring the same in a factory using a sand mastic binder that has storage stability at room temperature and can prevent adhesion between the binders; and is movable, thereby not requiring a separate heating device and reducing energy consumption. Also, the sand mastic asphalt mixture is to be used as a waterproof layer and an intermediate layer of a pavement body by heating and melting the same in the field and laying the same to a thickness of 1 to 3 cm, and can finish the pavement construction by laying pavement fibers on the top, and then laying asphalt concrete with a thickness of 5 to 8 cm on the pavement fibers without tack coating, thereby reducing fuel consumption and construction cost. In addition, the present invention is advantageous for maintenance and the environment by re-utilizing a thick sand mastic intermediate layer during resurfacing, and laying only the asphalt concrete.

Description

Sandmastic asphalt mixture and its construction method {SAND MASTIC ASPHALT MIXTURE AND CONSTRUCTION METHOD THEREOF}

The present invention relates to a sandmastic asphalt mixture and a construction method thereof, and in particular, since it is possible to transport the sandmastic mixture in a solid state at room temperature, the storage stability of the mixture is improved, and a separate heating device is not required for the transport vehicle. The sandmastic asphalt mixture, which can reduce energy consumption and improve the workability problem according to the capacity limit of the transport vehicle and the transport distance, is melted at the site and installed to a thickness of 1 to 3 cm. It is used as an intermediate layer, and after paving fibers are laid on the top, asphalt concrete can be laid on top of the paving fibers in a thickness of 5 to 8 cm to complete the pavement work, so the installation of the waterproof layer is omitted and fuel consumption due to transportation is reduced. It is possible to obtain a construction cost reduction effect, and since it is possible to cut and re-lay only asphalt concrete even during repaving construction, it relates to a sandmastic asphalt mixture that is advantageous for maintenance and environment and its construction method.

Cement concrete floor plates and pavements subjected to domestic traffic loads are damaged by freezing and thawing due to moisture at joints or cracks, or alkali aggregate reaction of concrete by wet salt deicing agent, fatigue cracking or plastic deformation by heavy vehicles. As a repair method for this, a method of repairing the section of the deteriorated area and repaving with asphalt concrete is widely used.

However, when the above section repair and asphalt concrete are covered without a stress-absorbing layer or barrier layer, horizontal and vertical movements due to temperature and traffic loads occur at the deteriorated area, joints, and repair areas located at the bottom, so that the upper asphalt concrete is paved. There is a problem that reflection cracks occur in the sieve.

As the reflective crack suppression method, there are a method of thickening the overlying layer and a method of crushing the base layer, but the method of delaying the reflective cracking by increasing the thickness of the overlying layer has a disadvantage of increasing the construction cost due to the thickening of the pavement. The in-situ crushing method, in which the pavement is crushed to form a base layer, can induce stress distribution, but a separate drainage system must be installed, the construction cost is high, and there is a problem of reducing the bearing capacity by crushing.

Another reflection crack suppression method is a method of installing a high-elastic asphalt stress absorbing layer that can simultaneously satisfy the function of a waterproofing agent for blocking water penetration and a pavement function for distributing stress, but there is still a lack of research on this in Korea.

In most concrete-paved highways in Korea, chloride or moisture penetrated into the concrete deck, causing alkali aggregate reactions, causing cracks and damage to the deck and pavement. Have been using

The waterproofing layer of a structure subjected to traffic load is installed to increase the durability of the structure by preventing corrosion of the reinforcing bar by preventing moisture penetration into the structure floor plate rather than the pavement function of stress distribution. In addition, the penetration-type waterproofing method lacks responsiveness to large cracks or behavior of the floor plate, and it is difficult to penetrate due to the use of high-strength concrete, and the sheet-type waterproofing method is difficult to connect joints between sheets and the surface of the concrete floor plate. Due to irregularities, the sheet may not be in close contact, and a lifting phenomenon may occur.

In addition, as described above, when the asphalt pavement body above the concrete slab is repaved, the existing waterproofing layer with a thickness of 1 to 2mm is damaged during the cutting of the existing pavement layer, so that the waterproof function is impaired, so that the waterproofing layer including the pavement layer is also After cutting them together, a waterproof layer of 1 to 2 mm thick is re-installed and an asphalt concrete pavement layer of 5 to 10 cm thick is installed.

This method is not efficient in terms of securing work time and constructability because the pavement layer and the lower waterproof layer must be removed and repackaged within the time available for traffic control. There is a problem that is not economical due to premature damage to the floor and excessive cost of maintenance of roads and bridges.

In many advanced countries such as Germany and Japan, asphalt mastic (goose asphalt), which does not require installation of a waterproofing layer and can function as a pavement body, is installed in a thickness of 3 to 4 cm, but its production and construction are difficult in Korea. There is a lot of research on this.

Natural asphalt, which is widely used in asphalt mastic such as goose asphalt, refers to asphalt that is calculated in the form of residues after the hard content of petroleum is evaporated by solar heat or geothermal heat. As natural asphalt with a lot of impurities is imported, there may be a problem that the properties of the asphalt mixture are not homogeneous.

In addition, high-strength mastic asphalt (goose asphalt) has advantages such as increased viscosity of asphalt, improved oxidation resistance, improved adhesion and deformation with aggregates, and excellent adhesion under high temperature and long-term conditions. In comparison, the asphalt content is more than 50%, so it is about three times more expensive than the general density asphalt mixture.

Most of the goose asphalt used in Korea is in the form of a plantmix, and a mixture of TLA natural asphalt, coarse aggregate, fine aggregate, and filler manufactured at the factory is blended from 220℃ to 260 through a dedicated warming mobile vehicle for more than 1 hour. Because it is mixed at a high temperature at ℃ and transported to the site, oxidation of the mixture and material phase separation by heat may occur, and the physical properties of the asphalt mixture may change due to ash (insoluble content) in TLA, and adverse environmental effects such as odor of oil vapor and smoke emission due to high temperature The application is limited in remote or small-scale sites due to the influence of the transport capacity and transport distance of the mobile vehicle.

Registered Patent No. 10-2034560 Registered Patent No. 10-1757233 Registered Patent No. 10-1594516

The present invention, conceived to solve the above problems, melts a solid sandmastic asphalt mixture that can be transported at room temperature at room temperature without a dedicated thermal insulation vehicle of 220°C to 260°C and installs it in a thickness of 1 to 3 cm. And by forming the intermediate layer of the pavement, it increases the durability life of the deck and pavement under the traffic load of vehicles such as bridges and boxes, and reduces energy consumption by continuing to use the waterproofing and intermediate layers without re-installing the waterproofing layer even during repaving construction. Its purpose is to provide a sandmastic asphalt mixture and its construction method that enable economical long-life facility maintenance.

The above object is 10 to 30% by weight of sandmastic binder, 5 to 35% by weight of aggregate of 4.75 to 10mm, 45 to 80% by weight of sand of 0.075 to 4.75mm, and 1 to 24% by weight of filler of 0.075mm or less. It is achieved by a sandmastic asphalt mixture, characterized in that the composition.

Here, the sandmastic binder is, straight asphalt (AP-3 or AP-5) 70 to 92% by weight: 60 to 80% by weight of petroleum asphalt mixed with 8 to 30% by weight of blown asphalt; It is composed of 5 to 20% by weight of process oil, 5 to 20% by weight of a thermoplastic elastomeric modifier, 5 to 20% by weight of a tackifier, and 1 to 20% by weight of a reinforcing material.

On the other hand, the above object, and a mixed manufacturing step of preparing the sandmastic asphalt mixture; A heating and stirring step of putting the sandmastic asphalt mixture prepared by mixing in the mixing manufacturing step into a heating mixer, and shearing the mixture at 150°C to 230°C for 30 minutes or more; A base surface arrangement step of removing foreign substances from the concrete base surface and maintaining a dry surface; An adhesive laying step of laying an asphalt-based, resin-based adhesive that is dried and cured within 1 hour on the concrete base surface by the base surface arrangement step; An asphalt mixture laying step for flattening after laying 1 to 3 cm of the sandmastic asphalt mixture heated and melted in the heating mixer of the heating and stirring step; It is achieved by the construction method of the sandmastic asphalt mixture, characterized in that it comprises an asphalt concrete laying step of laying asphalt concrete with a thickness of 5 to 8 cm on the top of the sandmastic asphalt mixture laid in the mixture laying step.

In addition, the above object, and a mixed manufacturing step of preparing the sandmastic asphalt mixture; A heating and stirring step of putting the sandmastic asphalt mixture prepared by mixing in the mixing manufacturing step into a heating mixer, and shearing the mixture at 150°C to 230°C for 30 minutes or more; A base surface arrangement step of removing foreign substances from the concrete base surface and maintaining a dry surface; An adhesive laying step of laying an asphalt-based, resin-based adhesive that is dried and cured within 1 hour on the concrete base surface by the base surface arrangement step; An asphalt mixture laying step for flattening after laying 1 to 3 cm of the sandmastic asphalt mixture heated and melted in the heating mixer of the heating and stirring step; A paving fiber installation step of installing sheet-shaped paving fibers having a thickness of 0.5 to 2.5 mm on an upper portion of the paved asphalt mixture; It is also achieved by the construction method of a sandmastic asphalt mixture, characterized in that it comprises an asphalt concrete laying step of laying asphalt concrete with a thickness of 5 to 8 cm on the top of the paving fiber.

In addition, the sheet-type packaging fiber is a non-woven fabric made of at least one of cellulose fibers, ceramic fibers, carbon fibers, glass fibers, and polyester fibers, or 50 to 60 g of rubber asphalt containing ionomers in a packaging fiber of 90 g/m 2 or more in the form of a woven fabric. It is preferable to impregnate /m2 or coat it with a thickness of 0.5 to 2.5mm.

In addition, the sheet-type packaging fiber is a non-woven fabric made of at least one or more of cellulose fiber, ceramic fiber, carbon fiber, glass fiber, and polyester fiber, or by laminating reinforcing fibers in a mesh or grid form on a packing fiber of 90 g/m2 or more in a woven fabric form. It is preferable that the rubber asphalt containing ionomer is impregnated with 50 to 60 g/m 2 or coated with a thickness of 0.5 to 2.5 mm.

The sandmastic asphalt mixture according to the present invention is manufactured with a sandmastic binder in the form of small lumps such as pellets, so that a separate heating device is not required during transport, so energy consumption can be reduced, and small production and long-distance transport are easy. Since the solid binder and aggregate are stored respectively, it has the effect of preventing material separation of the binder and aggregate.

In addition, in the construction method of the sandmastic asphalt mixture according to the present invention, after forming the sandmastic asphalt mixture using a sandmastic binder that has storage stability at room temperature and preventing adhesion between the binders, heating, melting, and heating in a heating agitator. After stirring, it is installed at 1 ~ 3cm to be used as an intermediate layer of the pavement, and after paving fibers are laid on the top, asphalt concrete is placed on the top of the paving fibers in a thickness of 5 ~ 8cm to complete the pavement work. Therefore, fuel consumption and construction cost can be reduced, and since only asphalt concrete can be laid during repaving, it has a beneficial effect on maintenance and environment.

1 is a flow chart showing in time series a construction method of a sandmastic asphalt mixture according to the present invention.
Figure 2 is a view showing the structure of the sheet-shaped packaging fiber according to the present invention.

The sandmastic asphalt mixture according to the present invention includes 10 to 30% by weight of a sandmastic binder, 5 to 35% by weight of aggregate of 4.75 to 10 mm, 45 to 80% by weight of sand of 0.075 to 4.75 mm, and a filler of 0.075 mm or less It is composed of 1 to 24% by weight.

The sandmastic asphalt mixture is preferably mixed after weighing the sandmastic binder mass and aggregate at a factory to meet the quality standards of the goose asphalt mixture.

For general asphalt mixtures where aggregate particle size distribution is important, the composition ratio of the mixture should be checked whenever the aggregate to be mixed is changed because the properties of the mixture vary depending on the type, size, and shape of the aggregate, as well as the physical properties of the asphalt binder itself. As the particle diameter of is increased, the surface area in contact with the highly elastic asphalt binder decreases, so the amount of binder decreases, but there is a disadvantage in that the porosity increases and thus watertightness is not possible.In the present invention, watertightness is made by increasing the sand content of 4.75mm or less than the maximum size aggregate One mixture can be obtained.

That is, 10 to 30% by weight of a sandmastic binder is added to 100% by weight of the sandmastic asphalt mixture, and 5 to 35% by weight of an aggregate of 4.75 to 10 mm, and 45 to 80% by weight of sand of 0.075 to 4.75 mm. It is preferable to add, and it is also possible to mix and use recycled aggregate.

In the sandmastic asphalt mixture, a filler of 0.075mm or less may be mixed with one or more types of stone powder, oxidized slag, and coal ash. Oxidized slag has a crushed surface, so it can obtain a meshing effect with the aggregate, which can increase plastic deformation resistance, and has excellent compatibility with the aggregate because there is little risk due to volume expansion.

If the filler is excessive, the crack resistance of the mixture may decrease and brittle fracture may occur. If the filler is insufficient, voids are generated and water tightness is not possible.

On the other hand, the sandmastic binder added to the sandmastic asphalt mixture according to the present invention is 70 to 92% by weight of straight asphalt (AP-3 or AP-5): petroleum asphalt mixed with 8 to 30% by weight of blown asphalt 60 to 80% by weight; It is composed of 5 to 20% by weight of process oil, 5 to 20% by weight of a thermoplastic elastomeric modifier, 5 to 20% by weight of a tackifier, and 1 to 20% by weight of a reinforcing material.

In the sandmastic binder composition, petroleum asphalt is a mixture of straight asphalt and blown asphalt, and straight asphalt is used to increase the adhesive strength with the aggregate, and the types are AP-3 and AP- It is distinguished by 5.

Straight asphalt has a penetration rate of 80 ~ 100, and contains a lot of bitumen that does not decompose into the last remaining material when crude oil is removed through an atmospheric pressure, vacuum distillation device, etc. Is preferably about 40 or more.

In the present invention, when straight asphalt is used alone, it flows at a high temperature, is damaged by a small impact from the outside, and is easily separated due to a decrease in bonding strength with each mixture. By mixing a modifier having a modifier to remove the aromatic (Arimatic) maltenin in the asphalt and adding a blown asphalt to increase the asphaltene content to obtain a high rigidity asphalt, straight asphalt and a modifier having a polybutadiene chain block and heating shear When agitating, the rubber modifier swells and the storage stability deteriorates. Therefore, the storage stability and high elasticity can be increased by adding more blown asphalt containing a lot of asphaltene.

In order to obtain petroleum asphalt with good rigidity while its softening point and penetration is lower than that of straight asphalt, it is well mixed with asphalt, and blown asphalt with a penetration index of 2.0 or more is used. Straight asphalt 70 ~ 92% by weight: blown asphalt 8 ~ 30 It is preferable to mix petroleum asphalt by weight %, and it is preferable that 60 to 80 weight% of petroleum asphalt is added to the total weight of the sandmastic binder composition.

When the petroleum asphalt is added in an amount of less than 60% by weight, the asphaltene content is low and high rigidity asphalt cannot be obtained, and when 80% by weight or more is added, the asphaltene content is too high to increase brittleness, and thus high elastic asphalt cannot be obtained.

Among the sandmastic binder compositions, the process oil can be selected from one or more vegetable oils such as soybeans and corn, and is used as an enhancer of the fluidity, dispersibility and physical properties of asphalt of the composition, and its viscosity is low when added to improve initial adhesion. , It is helpful in improving the permeability to the adherend.

When adding less than 5% by weight of process oil to the total weight of the sandmastic binder composition, it is not possible to suppress rapid physical property changes, it is difficult to properly control the working temperature, and it is difficult to secure improvement in tensile performance or heat resistance performance. And, when more than 20% by weight is added, plasticity is lost and morphological stability cannot be maintained.

Among the sandmastic binder compositions, thermoplastic carbonaceous modifiers are SBS (Styrene Butadiene Styrene), SBR (Styrene Butadiene Rubber), SEBS (Styrene Ethylene Butadiene Styrene), (L)LDPE ((Linear) Low Density Polyethylene), EVA (Ethylene). -Vinyl Acetate copolymer), PIB (Poly Iso Butylene), CR (Chloroprene Rubber), CSM (Chlorosulphonated Polyethylene), IR (Isoprene Rubber), IIR (Isoprene Isobutylene Rubber), EPDM (Eethylene Propylene Diene Monomer), PVC (Poly Vinyl) Chloride), PP (PolyPropylene), one or more selected, improves the high elastic modulus of the impact between sandmastic asphalt mixtures, absorbs the impact during external (repetitive heavy impact) pressure, and improves the durability of sandmastic asphalt. .

The thermoplastic elastomeric modifier is a high elastomer and a plastic polymer (plastomer) in a weight ratio of 4:1 to 1:1 by heating and mixing first at a shear rate of 300 rpm at 160 to 180°C, followed by mixing and shearing with petroleum asphalt. In addition, it is preferable to use a block copolymer, and the block copolymer has the advantage of being able to self-healing because it has reversible crosslinking and easy mixing with polar asphalt.

Prior to mixing with the petroleum asphalt, the high elastomer and the plastic polymer are first mixed in a shear stirrer to prevent phase separation due to physical properties such as specific gravity and polarity when mixing with petroleum asphalt, and it can be produced by mixing recycled rubber and plastic. .

The thermoplastic elastomeric modifier improves interfacial adhesion by forming a network with asphalt to increase high elasticity, heat resistance, tensile strength and plastic deformation resistance, thereby improving flow or deformation at high temperatures and cracks and breakages in a low temperature environment in winter. can do.

As an example of a thermoplastic elastic modifier, the butadiene chain block of a high-elastic copolymer of SBS (Styrene Butadiene Styrene) reacts with maltenes such as aromatic compounds of petroleum asphalt by heat and shear force, and the volume swells by about 20%, increasing the physical crosslinking point. As the density of the network structure increases, as the amount of SBS input increases, the penetration degree decreases, the softening point increases, and the crack resistance at low temperatures increases.

As an example of a thermoplastic plastic modifier, polypropylene resins such as Atactic PP, thermoplastic polyethylene resins such as LDPE, and ethylene copolymers such as EVA increase plastic deformation resistance at high temperatures.

Polypropylene and polyethylene resins with excellent cold resistance are non-polar resins composed of carbon and hydrogen, and because storage stability is difficult when mixed with polar asphalt, they have good affinity with other resins, have low melting points, and are mixed with EVA having polarity. It is preferable to use it.

If less than 5% by weight of the thermoplastic elastomeric modifier is added to the total weight of the sandmastic binder composition, the high elasticity is lowered, the shock absorption rate is lowered, the durability is lowered, and when it is added more than 20% by weight, it is highly stiff. It can be easily broken.

In the sandmastic binder composition, the tackifier is added with one or two or more of acrylic resin, phenol resin, terpene resin, natural resin, petrochemical resin, and PVB resin, and the bonding strength, adhesion, heat resistance, etc. between each polymer are improved. , Rosin ester, which is a high molecular weight obtained by reacting a petrochemical resin with a natural resin, may be added, or a terpene phenol resin may be added to maximize late adhesion, heat resistance, and bonding strength.

In addition, it increases the adhesion and processability of the composition, and serves to increase the adhesion with aggregate and slag, thereby preventing the detachment and peeling of the aggregate and slag.

If less than 5% by weight of the tackifier is added to the total weight of the sandmastic binder composition, the effect of improving the bonding performance and improving the adhesion between the mixed raw materials is insignificant. The phenomenon occurs, and the price of the product increases due to the increase in the content of the tackifier, which is relatively higher in cost than the low-cost raw material.

In the sandmastic binder composition, the reinforcing material is one or two or more of ionomer, asphaltite, sulfur, petroleum pitch, carbon black, slaked lime, and fly ash added, and ionomer Is a copolymer of ethylene and methylacrylic acid, an olefin-based carboxylated ionomer, and is a generic term for a polymer having a crosslinking bond by metal ions such as Na, K, Mg, and Zn to a carboxyl group. Is characterized by good adhesion to other polymers or metal foils and good adhesion to oil or oil.

The ionomer used in the present invention is an olefin-based carboxyl ionomer in the form of powder or granules. It is a polymer in which ethylene and (meth)acrylic acid are copolymerized, and the carboxy anion is an electrostatic neutralization cation of sodium (Na) or zinc (Zn). Due to the attractive force, it plays a role of crosslinking to increase the bonding strength between the polymer network chains in the sandmastic binder and the bonding strength with the anionic aggregate.

As an example of the asphaltite, when gilsonite is used together, the durability of the mixture is improved, and the quality control is easy and the rigidity of the asphalt mixture can be increased because it has almost no mineral material compared to other natural asphalt.

In addition, if the basic slaked lime is added, it is possible to chemically bond with ionomer and asphalt to maximize the bonding strength of the mixture, and increase the effective volume of the particles to prevent cracks with large organic rings in advance (improving fatigue resistance). It binds with the polar molecules of asphalt to inhibit the formation of asphaltenes to inhibit asphalt aging, improves the stiffness of the binder to increase plastic deformation resistance, and the particle diameter is smaller than 150 mesh and penetrates between each polymer to increase the bonding strength. Let it.

In addition, the surface of the aggregate is an anion, and if slaked lime, which is the basic (cation), is added, it is chemically bonded to maximize the bonding force, and the effective volume of the particles is increased by polar bonding with asphalt to prevent cracking into a large organic ring. It can be prevented (improved fatigue resistance), inhibits the formation of asphaltene by binding to the polar molecules of asphalt with an insoluble ionic compound, inhibits aging of asphalt, improves the stiffness of the binder, and increases plastic deformation resistance. It is smaller than 150 mesh and penetrates between each polymer to increase the bonding strength.

If less than 1% by weight of the reinforcing material is added to the total weight of the sandmastic binder composition, the above-described functions and desired effects cannot be obtained, and when more than 20% by weight is added, the temperature sensitivity of asphalt is increased and brittle fracture may occur at low temperatures. have.

The sandmastic binder formed as described above is produced by mixing with shear stirring at a high temperature, cooled and dried, and then processed into small lumps or pellets with a size of 1mm to 200mm in diameter or length using an extruder or a press machine. By allowing the storage and movement of the binder in the storage, it does not require a separate heating device, so energy consumption can be reduced, it is also easy to mix with aggregates to increase productivity, and it is easy to produce in small quantities and transport over long distances, and material separation occurs during storage. There is an advantage that can be prevented.

At this time, it is preferable that the small lumps or pellets are coated with sand or converter slag (BOS, Basic Oxygen Steelmaking Slag) to prevent adhesion between the respective sandmastic binders and increase the room temperature storage stability.

The sandmastic binder formed as described above is mixed with aggregate, sand, and filler, melted, and stirred to form a sandmastic asphalt mixture, and the sandmastic asphalt mixture thus formed is used as a waterproof layer and an intermediate layer or a base layer of the pavement. It is installed to be utilized.

The method of constructing the mixed sandmastic asphalt mixture as described above is as follows.

First, as shown in FIG. 1, a mixing manufacturing step (S1) of manufacturing a sandmastic binder, aggregate, sand, and packing material by weighing and mixing in a factory is performed.

That is, the sandmastic binder and aggregate processed in the form of small lumps are weighed and mixed at a factory to meet quality standards, construction thickness and quantity, and sand and filler are mixed, and when mixing, about 10kg ~ Packed in units of 30kg.

There is no need for a heating device for storage and transportation, and it can prevent the phase separation of materials, and because it is easy to mix and measure other materials such as fibers and medium temperature additives in the primarily weighed sandmastic mixture, it has excellent quality control and workability. Do.

Other additives may include at least one of an ether-based, ester-based, mineral-based, silica-silicone-based, and fatty acid-based antifoaming agent in the form of a powder in order to suppress the generation of internal bubbles and increase adhesion when mixed with a sandmastic binder. have.

In addition, fiber reinforcement can be performed because expansion by solar and geothermal heat in summer and contraction of the cabinet due to cold, snow and rain in winter can occur. When the aggregate is heated and dried, the fiber is also dried to activate the fiber surface to prevent fiber agglomeration. Can be prevented and distributed evenly.

At this time, if necessary, medium temperature additives such as wax may be mixed together. In particular, it is preferably used to shorten the curing time of the mixture laid by high temperature in summer.

In addition, the sandmastic asphalt mixture prepared by mixing in the mixing manufacturing step (S1) is introduced into a vehicle mobile heating mixer, and the mixture is evenly dispersed through a heating agitation step (S2) of shear stirring at 150°C to 230°C for 30 minutes or more. do.

At this time, if necessary, medium temperature additives such as wax may be mixed together. In particular, it is preferably used to shorten the curing time of the mixture laid by high temperature in summer.

During heating and melting, since the surface area of the sandmastic binder in the form of small lumps is large, the sandmastic binder melts at a faster rate, and the aggregate is also heated at the same time, so that the mixture can be evenly mixed, improving workability and quality, and for a long time. It is easy for quality control as it can prevent carbonization and oxidation of physical properties by mixed heating.

In addition, by using a blasting, water jet, or dust collecting device to remove foreign substances such as latency and rust on the base surface of the structure, and perform a base surface cleaning step (S3) of maintaining a dry surface.

In addition, the solid content of organic additives and inorganic additives comprising at least one of asphalt, process oil, and rubber on the base surface of the base surface arrangement step (S3) is 70% or more, and an asphalt-based or resin-based material that is dried within 1 hour. Perform the adhesive installation step (S4) to install the adhesive.

The asphalt-based adhesive is an adhesive that has a solid content of 70% or more of organic additives and inorganic additives such as asphalt, process oil, and rubber, and is dried within 1 hour, and it is preferable to use a solvent type or an emulsion type, but the present invention is limited thereto. It can be used in various ways, and the asphalt-based adhesive should have a softening point lower than the laying temperature (about 170~190℃) of the sandmastic asphalt mixture to be laid on the top.

In addition, the asphalt mixture laying step (S5) for flattening after laying the sandmastic asphalt mixture heated and melted in the heating mixer of the heating and stirring step (S2) at 1 to 3 cm above the asphalt-based adhesive was laid. Conduct.

In addition, the asphalt concrete laying step (S7) of laying asphalt concrete with a thickness of 5 to 8 cm on the top of the sandmastic asphalt mixture laid in the mixture laying step is carried out to finish.

Here, the present invention is a step before performing the above-described asphalt concrete laying step (S7), as shown in FIG. 2 on the top of the laid asphalt mixture, ceramic fiber, carbon fiber, glass fiber, polyester fiber, and heat resistance. About 0.5 ~ 0.5 ~ 0.5 ~ coated with or impregnated with asphalt of about 50 g / ㎡ or more in at least one fiber 102 of 90 g / ㎡ or more or reinforcing fiber 104 in the form of mesh or grid in the form of an excellent non-woven fabric or woven fabric A packing fiber installation step (S6) of installing a sheet-shaped packing fiber 100 having a thickness of 2.5mm may be performed.

The non-woven or woven paving fiber 102 is integrated with the pavement layer by the laying temperature of the asphalt concrete pavement layer located above while preventing bleeding of the sandmastic asphalt mixture due to high temperature, and prevents damage caused by heavy equipment such as finishers. I can.

In the present invention, high-strength fibers such as geotextiles such as grids or carbon fibers may be used depending on the degree of reinforcement according to the site situation and the condition of the floor plate. It is preferable to use fibers, and about 30 minutes after the wrapping fibers are laid on the top of the sandmastic layer, by compacting them with a tire roller, the trapped air can be compressed, and it can be brought into close contact with the bottom plate.

In other words, in the present invention, after performing the paving fiber installation step (S6) as described above, the asphalt concrete laying step (S7) of laying asphalt concrete with a thickness of 5 to 8 cm on the top of the sheet-shaped paving fiber 100 is performed. It can be done by doing it.

In the end, in general, the asphalt pavement layer is laid with a thickness of 5 ~ 8cm in the bridge pavement, but a waterproof layer of 1 ~ 2mm is installed and the asphalt concrete is laid on it with a thickness of about 4 ~ 5cm two times to proceed with the pavement construction. However, in the present invention, it is economical in terms of fuel consumption and construction cost because the pavement construction can be completed by installing the sandmastic in about 1 to 3 cm and installing asphalt concrete pavement with a thickness of about 5 to 6 cm only once.

In addition, there is an advantage in maintenance and environmental aspects because the thick waterproof layer and the intermediate layer are reused and only the asphalt concrete pavement layer is reinstalled without re-installing the waterproof layer during repaving construction.

Claims (6)

Sandmastic composed of 10 to 30% by weight of sandmastic binder, 5 to 35% by weight of aggregate of 4.75 to 10㎜, 45 to 80% by weight of sand of 0.075 to 4.75㎜, and 1 to 24% by weight of filler less than 0.075㎜ A mixed manufacturing step of preparing an asphalt mixture;
A heating and stirring step in which the sandmastic asphalt mixture prepared by mixing in the mixing manufacturing step is added to a heating mixer, and sheared and stirred at 150°C to 230°C for 30 minutes or more;
A base surface arrangement step of removing foreign substances from the concrete base surface and maintaining a dry surface;
An adhesive laying step of laying an asphalt-based, resin-based adhesive that is dry and cured within 1 hour on the concrete base surface by the base surface arrangement step;
An asphalt mixture laying step of laying 1 to 3 cm of sandmastic asphalt mixture heated and melted in the heating mixer of the heating and stirring step and then performing a planarization operation;
The sheet-shaped paving fiber on the top of the paved asphalt mixture is a non-woven fabric made of at least one of cellulose fiber, ceramic fiber, carbon fiber, glass fiber, and polyester fiber, or a rubber containing ionomer in a paving fiber of 90 g/m 2 or more in the form of a woven fabric. A paving fiber installation step of installing a sheet-shaped paving fiber having a thickness of 0.5 to 2.5 mm by impregnating asphalt with 50 to 60 g/m 2 or coating it to a thickness of 0.5 to 2.5 mm;
Construction method of a sandmastic asphalt mixture, characterized in that it comprises an asphalt concrete laying step of laying asphalt concrete with a thickness of 5 to 8 cm on the top of the paving fiber.
Sandmastic composed of 10 to 30% by weight of sandmastic binder, 5 to 35% by weight of aggregate of 4.75 to 10㎜, 45 to 80% by weight of sand of 0.075 to 4.75㎜, and 1 to 24% by weight of filler less than 0.075㎜ A mixed manufacturing step of preparing an asphalt mixture;
A heating and stirring step in which the sandmastic asphalt mixture prepared by mixing in the mixing manufacturing step is added to a heating mixer, and sheared and stirred at 150°C to 230°C for 30 minutes or more;
A base surface arrangement step of removing foreign substances from the concrete base surface and maintaining a dry surface;
An adhesive laying step of laying an asphalt-based, resin-based adhesive that is dry and cured within 1 hour on the concrete base surface by the base surface arrangement step;
An asphalt mixture laying step of laying 1 to 3 cm of sandmastic asphalt mixture heated and melted in the heating mixer of the heating and stirring step and then performing a planarization operation;
Reinforcing fibers in a mesh or grid form are laminated on a non-woven fabric made of at least one or more of cellulose fibers, ceramic fibers, carbon fibers, glass fibers, and polyester fibers on top of the paved asphalt mixture. A packing fiber installation step of installing a sheet-shaped packing fiber having a thickness of 0.5 to 2.5 mm, which is made by impregnating 50 to 60 g/m 2 of rubber asphalt containing an ionomer or coating it to a thickness of 0.5 to 2.5 mm;
Construction method of a sandmastic asphalt mixture, characterized in that it comprises an asphalt concrete laying step of laying asphalt concrete with a thickness of 5 to 8 cm on the top of the paving fiber.
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