KR102570964B1 - Asphalt modifier composition, asphalt concrete composition including the same and construction method using the same - Google Patents

Abstract

The present invention relates to an asphalt modifier composition comprising a thermoplastic polyolefin, a thermoplastic rubber, an amorphous polyalphaolefin, a viscosity modifier, an anti-stripping agent and a surface coating agent, an asphalt concrete composition comprising the same, and a construction method thereof, the asphalt of the present invention The modifying additive composition can significantly improve the strength, plastic deformation resistance and crack resistance of asphalt concrete pavement, improve the demanding productivity and workability of high-viscosity, impervious, non-porous asphalt mixture, and secure excellent construction quality.

Description

Asphalt modifier composition, asphalt concrete composition including the same and construction method using the same}

The present invention relates to an asphalt modifier composition, an asphalt concrete composition containing the same, and a construction method thereof, and more particularly, an asphalt modifier composition capable of significantly improving the strength of an asphalt concrete pavement, an asphalt concrete composition containing the same, and It's about how to build it.

Asphalt is a residue after evaporation of most of the volatile oils among petroleum components, and maintains a highly viscous liquid or semi-solid state at high temperatures, but has physical properties that harden at temperatures below room temperature.

Asphalt is mainly used as a binding material or adhesive material because it has excellent adhesion and adhesion to mineral materials, and is also used as a waterproof material because it is not soluble in water and is impermeable. This has great advantages. Due to these advantages and characteristics, asphalt has a wide range of applications and is used for various purposes such as road pavement, repair such as dam construction, waterproofing, general industrial use, and agricultural use.

Looking at the case where the asphalt is applied to road pavement, it is rare that the asphalt itself is usually used alone, and it is used as asphalt concrete made by mixing aggregates and fillers. The aggregate serves as a framework in asphalt concrete to provide bearing capacity, load distribution and frictional resistance, and is divided into coarse aggregate mainly used for crushed stone and fine aggregate mainly used for crushed sand and river sand. In addition, the filler used to fill the voids of the coarse aggregate and the fine aggregate serves to improve exfoliation resistance by being mixed with asphalt, and fine powders of inorganic materials such as stone powder are mainly used.

However, asphalt is liquefied and transferred to a liquid phase as the temperature rises without a clear melting point, and the change in consistency with temperature is very large. Accordingly, cracks due to brittleness occur in the asphalt concrete structure under low-temperature conditions, and plastic deformation due to severe ductility occurs under high-temperature conditions, thereby shortening the durability and life span of asphalt concrete.

Asphalt modifiers are widely used for the purpose of preventing these problems and improving the performance of asphalt paved roads. Efforts for the application of and research and development of new materials are increasing.

Registered Patent No. 10-1924793 (registered on November 28, 2018)

An object of the present invention is to provide an asphalt modifier composition capable of significantly improving the strength of an asphalt concrete pavement, an asphalt concrete composition containing the same, and a construction method thereof.

One embodiment of the present invention for achieving the above object, 100 parts by weight of thermoplastic polyolefin, 5 to 32 parts by weight of thermoplastic rubber, 10 to 45 parts by weight of amorphous polyalphaolefin, 9 to 40 parts by weight of a viscosity modifier, peeling It relates to an asphalt modifying additive composition comprising 1 to 20 parts by weight of an inhibitor and 1 to 18 parts by weight of a surface coating agent.

The thermoplastic rubber may include at least one or more of butyl rubber, nitrile rubber, and styrene-isoprene-styrene (SIS) rubber.

The weight average molecular weight of the amorphous polyalpha olefin may be 4,000 to 100,000 g/mol.

The viscosity modifier may include wax.

The asphalt modifier additive composition may further include a function improver.

The functional enhancer may include at least one or more of a terpene phenol resin and a benzimidazole compound.

Another embodiment of the present invention relates to an asphalt concrete composition comprising 3 to 20 parts by weight of an asphalt binder and 1 to 8 parts by weight of an asphalt modifier composition according to an embodiment, based on 100 parts by weight of aggregate.

Another embodiment of the present invention relates to a construction method of an asphalt concrete composition according to another embodiment, comprising the steps of arranging a surface to be constructed; Preparing an asphalt concrete composition by mixing 3 to 20 parts by weight of an asphalt binder and 1 to 8 parts by weight of an asphalt modifier composition according to an embodiment with respect to 100 parts by weight of aggregate; Paving by pouring the asphalt concrete composition on the surface to be constructed from which foreign substances are removed; and curing the poured asphalt concrete composition.

The asphalt modifier composition of the present invention can significantly improve the strength of an asphalt concrete pavement.

In addition, it is possible to improve the difficult productivity and workability of high-viscosity, impervious, non-porous asphalt mixtures, and to secure excellent construction quality.

In addition, it has the advantage of being able to improve the resistance to plastic deformation due to its excellent elasticity and resilience of paved roads, and significantly improving its crack resistance due to its excellent cold resistance and heat resistance.

In addition, it is possible to improve the impermeability, moisture resistance and waterproofness of the impervious asphalt concrete pavement.

Prior to a detailed description of the preferred embodiments of the present invention below, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and meanings consistent with the technical spirit of the present invention. and should be interpreted as a concept.

Throughout this specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

Throughout this specification, “%” used to indicate the concentration of a specific substance is (weight/weight)% for solid/solid, (weight/volume)% for solid/liquid, and liquid (weight/volume)%, unless otherwise specified. /liquid means (volume/volume)%.

In each step, the identification code is used for convenience of description, and the identification code does not explain the order of each step, and each step may be performed in a different order from the specified order unless a specific order is clearly described in context. there is. That is, each step may be performed in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

Hereinafter, look at an embodiment of the present invention. However, the scope of the present invention is not limited to the following preferred embodiments, and those skilled in the art can implement various modified forms of the contents described herein within the scope of the present invention.

The present invention relates to an asphalt modifier composition, an asphalt concrete composition comprising the same, and a construction method thereof.

Asphalt modifier composition according to an embodiment of the present invention contains 100 parts by weight of thermoplastic polyolefin, 5 to 32 parts by weight of thermoplastic rubber, 10 to 45 parts by weight of amorphous polyalphaolefin, 9 to 40 parts by weight of a viscosity modifier, and 1 to 20 parts by weight of an anti-stripping agent. Including parts by weight and 1 to 18 parts by weight of the surface coating agent, it is possible to improve the demanding productivity and workability of high-viscosity, impermeable, non-porous asphalt mixtures, and to secure excellent construction quality. In addition, the asphalt concrete pavement prepared by adding it has excellent elasticity and resilience, so it has excellent resistance to plastic deformation, and has excellent cold resistance and heat resistance, so it has the advantage of significantly improving crack resistance. In addition, it is possible to improve the impermeability, moisture resistance and waterproofness of the impervious asphalt concrete pavement.

Thermoplastic polyolefin is a more advanced material than commonly used thermoplastic resins such as polyethylene and polypropylene, and is a soft raw material having elasticity. Thermoplastic polyolefin is a material that has both rubber-like ductility, elasticity, and resilience and plastic-like hard properties, and can improve cold resistance and heat resistance without impairing the strength of an asphalt concrete composition.

The thermoplastic rubber is a rubber that is not vulcanized, and at least one of butyl rubber, nitrile rubber, and styrene-isoprene-styrene (SIS) rubber may be used. Since thermoplastic rubber has high physical strength and elasticity, it can improve the strength and resistance to plastic deformation of the asphalt concrete composition.

Thermoplastic rubber may be included in an amount of 5 to 32 parts by weight based on 100 parts by weight of thermoplastic polyolefin. If the content is insufficient beyond the above range, it is difficult to obtain the effect of securing strength and plastic deformation resistance by adding thermoplastic rubber, and exceeding the above range When it is included, the hardness and strength of the asphalt concrete pavement are reduced, so it is preferably included within the above-mentioned weight range.

The amorphous polyalpha olefin is an amorphous olefin-based polymer, and includes, for example, a propylene homopolymer, a propylene-ethylene copolymer, a propylene-1-butene copolymer, and the like. Amorphous polyalpha olefin has excellent adhesiveness to improve the bonding strength between the raw materials included in the asphalt concrete composition, has excellent cold resistance to mitigate or prevent cracks caused by the temperature sensitivity of asphalt, and has excellent processability to improve overall workability. There are advantages to improving. If the molecular weight of the amorphous polyalpha olefin is too low, the strength of the asphalt concrete pavement may be lowered, and if the molecular weight is too high, workability is poor. .

Amorphous polyalphaolefin (APAO) may be included in an amount of 10 to 45 parts by weight based on 100 parts by weight of thermoplastic polyolefin. Since the elasticity and strength of the asphalt concrete pavement are lowered and the durability of the paved road is lowered due to repeated load application, it is preferable to be included within the above-mentioned weight range.

The viscosity modifier is added to prevent a rapid increase in viscosity that occurs when the asphalt modifier composition is mixed with the asphalt binder, and the viscosity modifier may include wax. The wax includes polyethylene wax, polypropylene wax, and amide wax. At least one or more of them may be used, and various commonly used waxes may be applied without being limited thereto.

The viscosity modifier may be included in an amount of 9 to 40 parts by weight based on 100 parts by weight of thermoplastic polyolefin, and when it is included in less than 9 parts by weight, the viscosity lowering effect is insignificant, reducing workability and uniform stirring of the asphalt concrete composition. It is difficult to secure one physical property, and when it is included in excess of 40 parts by weight, a phase separation problem occurs due to excessive viscosity drop, so it is preferably included within the above-described weight range.

The anti-peeling agent is added to prevent peeling of asphalt and aggregate, asphalt and the surface to be coated by moisture penetration and to improve their bonding strength. And at least any one or more of slaked lime may be used, and any material that is not limited thereto and is commonly used may be used.

The anti-stripping agent may be included in an amount of 1 to 20 parts by weight based on 100 parts by weight of thermoplastic polyolefin. Since it can be lowered, it is preferable to be included within the above-mentioned weight range.

The surface coating agent is added to prevent a blocking phenomenon in which each particle sticks to each other when the asphalt modifier composition is formed in a granular form such as a pellet, and commonly used antiblocking agents such as talc, calcium carbonate, and zinc stearate can be used. there is.

The surface coating agent may be included in an amount of 1 to 18 parts by weight based on 100 parts by weight of thermoplastic polyolefin, and when included in less than the above weight range, sufficient blocking resistance is not obtained, and when included in excess of the above weight range, asphalt concrete pavement Since it can reduce the physical properties of, it is preferably included within the above-described weight range. In addition, the surface coating agent may be applied by mixing the remaining components except for the surface coating agent in the asphalt modifier composition, molding them into granules, and then mixing them to coat the surface of the particles.

Meanwhile, the asphalt modifier composition according to an embodiment of the present invention may further include a function improver, and the function improver may include at least one of a terpene phenol resin and a benzimidazole compound, preferably can include both of these.

The functional enhancer may be included in an amount of 0.5 to 3 parts by weight based on 100 parts by weight of thermoplastic polyolefin. In this case, since the strength of the asphalt concrete pavement is lowered and may rather cause a shortening of life, it is preferable to be included within the above-described weight range.

The terpene phenol resin is a polymer containing a terpene residue and a phenol residue, and is a concept including both a copolymer of a terpene and a phenol compound and a phenol-modified terpene resin. It is preferable to use a terpene phenol resin having a softening point of 110 to 160° C. in order to secure heat resistance and improve cohesion.

The benzimidazole compound is an aromatic heterocyclic organic compound having a two-ring structure in which a benzene ring and an imidazole ring are fused, and is added to improve the durability of an asphalt concrete pavement. In particular, when phenyl benzimidazole sulfonic acid is used as the benzimidazole compound, heat resistance, chemical resistance and weather resistance are further improved, so it is preferable to use phenyl benzimidazole sulfonic acid.

When the terpene phenol resin and the benzimidazole compound are used together as the functional improver, weatherability and durability are further improved, so it is preferable to use both together. In this case, the terpene phenol resin and the benzimidazole compound are 1: It is preferable to use in a weight ratio of 0.3 to 0.7. If it is out of this weight range, durability or strength is rather deteriorated, and waterproofness may cause problems, so it is preferable to be included within the above-mentioned weight ratio.

An asphalt concrete composition according to another embodiment of the present invention includes 3 to 20 parts by weight of an asphalt binder and 1 to 8 parts by weight of an asphalt modifier composition according to an embodiment of the present invention, based on 100 parts by weight of aggregate.

Aggregates act as a framework within asphalt concrete to provide bearing capacity, load distribution and frictional resistance. Aggregates are combined with rubber or polymer materials in an asphalt binder or asphalt modifier composition to form a single mass to provide stronger bearing capacity and strength.

Aggregate includes coarse aggregate with an average particle diameter of 10 to 15 mm, fine aggregate with an average particle diameter of 0.08 to 10 mm, and filler material with an average particle diameter of 1 mm or less. Coarse aggregate serves as the basic frame of the paving material, fine aggregate is located between the coarse aggregates and provides support between the aggregates, and the filler fills the empty space formed by the coarse and fine aggregates to provide a stronger and more stable skeletal structure of the paving material. form

These aggregates may include 80 to 200 parts by weight of fine aggregate and 10 to 30 parts by weight of filler with respect to 100 parts by weight of coarse aggregate, and when included within this weight range, the strength and durability of the basic skeleton of the paving material can be formed high.

Inorganic materials such as sand, gravel, crushed stone, basalt, granite, stone dust, and silica sand may be used as the coarse or fine aggregate, and any aggregate used in construction or road paving may be used without limitation thereto. Further, as the filling material, limestone powder, Portland cement, slaked lime, fly ash, recovered dust, casting dust, and steelmaking dust may be used, but are not limited thereto.

Asphalt binder provides bonding strength between aggregates. A road formed by pouring an asphalt concrete composition to which an asphalt binder is added has high fluidity and elasticity, thereby reducing noise or vibration generated during vehicle driving, thereby improving drivability.

The asphalt binder may be included in an amount of 3 to 20 parts by weight based on 100 parts by weight of the aggregate. If the asphalt binder is insufficient outside the above range, it is difficult to provide sufficient bonding strength between the aggregates, resulting in poor or impossible road pavement, and the asphalt binder When is excessively included, since the area occupied by asphalt having relatively low strength and good elasticity in the paved road is large, it leads to road deformation and consequent reduction in life span, so it is preferably included within the above-mentioned weight range.

Asphalt is not particularly limited as long as it is commonly used in the art, and various types of asphalt may be used. For example, straight asphalt, lake asphalt, rock asphalt, sand asphalt, asphaltite, cutback asphalt, blown asphalt, and the like may be used. At this time, it is preferable to use asphalt having a penetration of 20 to 40.

The asphalt modifier composition is described in one embodiment of the present invention, and duplicate descriptions are omitted. The asphalt modifier composition may be included in an amount of 1 to 8 parts by weight based on 100 parts by weight of aggregate, and when included in an amount less than the above range, it is difficult to see the effect of enhancing durability and thus improving the life of the road, and included in excess of the above weight range In this case, since the area occupied by the asphalt binder or aggregate in the road pavement is relatively reduced, strength, bonding strength, and durability may be deteriorated accordingly, so it is preferably included within the above-described weight range.

The asphalt concrete composition according to the present embodiment may be a composition for forming an impervious asphalt concrete pavement.

Another embodiment of the present invention relates to a construction method of the asphalt concrete composition described above, comprising the steps of arranging the surface to be coated; Preparing an asphalt concrete composition by mixing 3 to 20 parts by weight of an asphalt binder and 1 to 8 parts by weight of an asphalt modifier composition according to an embodiment of the present invention with respect to 100 parts by weight of aggregate; Paving by pouring the asphalt concrete composition on the surface to be constructed from which foreign substances are removed; and curing the poured asphalt concrete composition.

The step of arranging the surface to be installed is a step of flattening the surface to be installed and removing foreign substances to arrange the surface to be easily installed.

Preparing the asphalt concrete composition is a step of preparing an asphalt concrete composition by mixing 3 to 20 parts by weight of an asphalt binder and 1 to 8 parts by weight of an asphalt modifier composition according to an embodiment of the present invention with respect to 100 parts by weight of aggregate. am. This step may be performed by heating the aggregate and mixing the asphalt binder and the asphalt modifier composition therein. Since the asphalt concrete composition has already been described in one embodiment of the present invention, redundant description will be omitted.

Next, a step of pouring and paving the asphalt concrete composition on the surface to be constructed from which the foreign matter is removed is performed, and after the pouring, one or more compaction operations may be performed. Then, the step of curing the poured asphalt concrete composition proceeds in sequence. Curing conditions are not particularly limited, and curing may be performed under various conditions suitable for the season, weather, and temperature.

Hereinafter, specific actions and effects of the present invention will be described through an embodiment of the present invention. However, this is presented as a preferred example of the present invention, and the scope of the present invention is not limited according to the examples.

[Production Example]

Asphalt Modifying Additive Manufacture

1kg of thermoplastic polyolefin, 83g of thermoplastic rubber, butyl rubber, 35g of nitrile rubber, 268g of amorphous polyalphaolefin (propylene-ethylene copolymer), 200g of viscosity modifier (polyethylene wax), and 50g of phosphoric acid ester stripping inhibitor were put into an extruder and heated at 200±10℃ After melting and extruding at a temperature of about 5 mm in the form of a circular rope in diameter, after cooling it and cutting it into a length of about 10 mm, it is molded into a granular shape, uniformly mixed with 35 g of calcium carbonate, and coated on the surface to form a pellet. An asphalt modifying additive was prepared.

Asphalt concrete specimen manufacturing

After heating 1 kg of aggregate, a mixture of coarse aggregate, fine aggregate and filler, at 155 ± 5 ° C for 2 hours, 80 g of straight asphalt (AP-5) and 35 g of the previously prepared asphalt modifier were mixed and stirred to form asphalt concrete. After preparing, it was placed in a mold having a thickness of 60 mm and a diameter of 150 mm and cured to prepare an asphalt concrete specimen of Example 1. Coarse aggregate with a particle size distribution of 6 to 25 mm and an average particle size of 13 mm, fine aggregate with a particle size of 6 mm or less and an average particle size of 1 mm, and mixed aggregate mixed with limestone as a filler in a weight ratio of 1:1.3:0.2 are used. did

[Experimental Example 1]

The basic physical properties of the specimen of Example 1 prepared in Preparation Example were measured, and the results are shown in Table 1.

measurement method measurement result Marshall stability (N) KS F 2337 22,538 Flow value (1/100 cm) KS F 2337 30 Dynamic stability (times/mm) KS F 2374 3,156 water permeability KS F 4936 non-pitcher

As a result of quality measurement, it was confirmed that the specimen of Example 1 exhibited good performance in all items while being impervious to water.

[Experimental Example 2]

A specimen was prepared using the same method as in Preparation Example, but the specimen was prepared by changing the content of amorphous polyalphaolefin (APAO). The weight of APAO shown in Table 2 means a weight ratio with respect to 100 parts by weight of thermoplastic polyolefin. Then, the length change rate (KS F 2424), adhesive strength (KS F 2476) and compressive strength (KS F 2406) of each specimen were measured and listed in Table 3.

public body number APA
weight Test Items Length change rate (%) Adhesive strength (N/㎟) Compressive strength (N/㎟) #One 5.1 0.02 1.6 43.1 #2 10.8 0.03 2.1 43.5 #3 21.6 0.02 2.3 44.0 #4 32.0 0.04 2.4 42.8 #5 44.5 0.05 2.5 41.8 #6 49.7 0.09 2.5 37.5

Referring to the experimental results of Table 2, it can be confirmed that the result of reducing the length change rate of the specimen and increasing the adhesive strength and compressive strength by adding an appropriate amount of APAO. However, when the content of APAO is insufficient (#1), the adhesive strength is lowered, and when it is included in an excessive amount (#6), the strength is lowered and the length change rate increases, so APAO is 10 parts by weight of thermoplastic polyolefin. It was confirmed that it is preferably included in ~ 45 parts by weight.

[Experimental Example 3]

A specimen was prepared in the same manner as the specimen of Example 1, but a function enhancer was further added to prepare a specimen. As the functional improver, one or more of terpene phenol resin (TP) and phenyl benzimidazole sulfonic acid (PBIS) was used, and specimens having variously changed contents thereof were prepared as shown in Table 3. In Table 3, the content of each component means the weight ratio with respect to 100 parts by weight of the thermoplastic polyolefin, and the converted weight ratio means the weight ratio converted based on 1 part by weight of the terpene phenol resin.

public body number TP PBIS Sum converted weight ratio
(TP: PBIS) #7 2.5 0 2.5 2.5:0 #8 2.4 0.3 2.7 1:0.1 #9 2.1 0.7 2.8 1:0.3 #10 1.8 1.0 2.8 1:0.6 #11 1.6 1.1 2.7 1:0.7 #12 1.4 1.2 2.6 1:0.9 #13 0 2.5 2.5 0:2.5

Next, for each specimen, dynamic stability and water permeability were measured using the same method as Experimental Example 1, and each physical property was measured by the same method as the method used for measuring the length change rate, adhesive strength, and compressive strength of Experimental Example 2. and listed in Table 4. At this time, the specimen of #3 prepared in Experimental Example 2 was used as a control example.

public body number dynamic stability
(times/mm) water permeability length change rate
(%) adhesive strength
(N/㎟) compressive strength
(N/㎟) #3 3,211 non-pitcher 0.02 2.3 44.0 #7 3,428 non-pitcher 0.03 2.2 44.3 #8 3,356 non-pitcher 0.03 2.5 44.9 #9 4,028 non-pitcher 0.03 2.7 49.5 #10 4,133 non-pitcher 0.04 2.8 50.1 #11 4,250 non-pitcher 0.04 2.8 49.2 #12 3,853 non-pitcher 0.04 2.8 39.9 #13 3,492 non-pitcher 0.05 2.3 38.1

Referring to Table 3 and Table 4, it was found that the overall length change rate slightly increased, and the dynamic stability, adhesive strength and compressive strength were improved when the functional improver was added. In particular, in the case of specimens #9 to #11 using TP and PBIS together as functional improvers, it was confirmed that dynamic stability, adhesive strength and compressive strength were significantly improved.

However, when TP was used alone as a function enhancer (#7) or when PBIS was used alone (#13), the degree of change was not significant, and even when the two components were mixed and used, TP was excessive (#8) Conversely, when PBIS was excessive (#12), the change was also insignificant. In particular, in the case of #12 and #13, the compressive strength was rather poor.

Therefore, as a result of this experiment, it was confirmed that it is preferable to use terpene phenol resin and phenyl benzimidazole sulfonic acid together as a functional improver, but mixing them so that their weight ratio is 1: 0.3 to 0.7.

The present invention is not limited to the specific embodiments and descriptions described above, and various modifications can be made by anyone skilled in the art without departing from the gist of the present invention claimed in the claims. and such modifications are within the protection scope of the present invention.

Claims (7)

100 parts by weight of thermoplastic polyolefin, 5 to 32 parts by weight of thermoplastic rubber, 10 to 45 parts by weight of amorphous polyalphaolefin, 9 to 40 parts by weight of a viscosity modifier, 1 to 20 parts by weight of an anti-peeling agent, 1 to 18 parts by weight of a surface coating agent and a functional improver 0.5 to 3 parts by weight,
The functional improver is an asphalt modifier additive composition, characterized in that the terpene phenol resin and the benzimidazole compound are mixed in a weight ratio of 1: 0.3 to 0.7.
According to claim 1,
The thermoplastic rubber is characterized in that it comprises at least one or more of butyl rubber, nitrile rubber and styrene-isoprene-styrene (SIS) rubber, asphalt modifier composition.
According to claim 1,
The weight average molecular weight of the amorphous polyalphaolefin is 4,000 to 100,000 g / mol, characterized in that, the asphalt modifier additive composition.
According to claim 1,
The viscosity modifier is an asphalt modifier composition, characterized in that it comprises a wax.
delete An asphalt concrete composition comprising 3 to 20 parts by weight of an asphalt binder and 1 to 8 parts by weight of the asphalt modifier composition according to any one of claims 1 to 4, based on 100 parts by weight of aggregate.
arranging the surface to be installed;
Preparing an asphalt concrete composition by mixing 3 to 20 parts by weight of an asphalt binder and 1 to 8 parts by weight of the asphalt modifier composition of any one of claims 1 to 4 with respect to 100 parts by weight of aggregate;
Paving by pouring the asphalt concrete composition on the surface to be constructed from which foreign substances are removed; and
A method of constructing an asphalt concrete composition comprising the steps of curing the poured asphalt concrete composition.