KR20130037738A - Additive for warm mix asphalt - Google Patents

Abstract

PURPOSE: An additive for warm mix asphalt is provided to prevent physical property degradation phenomenon by having a resolution temperature which is 30°C lower than a hot mix asphalt mixture. CONSTITUTION: An additive for warm mix asphalt comprises an ethylene oxide or propylene oxide-derived amine as a surfactant. In the ethylene oxide-derived amine(NRR^1R^2), R is C1-30 saturated or unsaturated, substituted or unsubstituted, selectively branched or cyclic hydrocarbon group and has 3-61 hydrogen atoms; and each of R^1 and R^2 is ethylene oxide. In the ethylene oxide-derived amine(NRR^1R^2), R is C1-30 saturated or unsaturated, substituted or unsubstituted, selectively branched or cyclic hydrocarbon group and has 3-61 hydrogen atoms; and each of R^1 and R^2 is propylene oxide.

Description

Low Carbon Medium Temperature Asphalt Additive {Additive For Warm Mix Asphalt}

The present invention relates to an additive for a low carbon medium temperature asphalt mixture (Warm Mix Asphalt: WMA), which will be described in more detail in an amine (Ethylene oxide) or propylene oxide (Propylene oxide) derived from the additive. The low-carbon medium-temperature asphalt additive that can prevent the degradation of physical properties at low temperature as the additive is completely dissolved and at the same time the additive is completely dissolved at a temperature lower than the heated asphalt mixture (HMA) by allowing the surfactant to be included. To provide.

Due to the recent global warming, the world average temperature has risen by 0.74 ℃ for 100 years, resulting in droughts, floods, heat waves, and destruction of ecosystems. As Korea is directly affected by global warming, it is showing high interest in eco-friendly green growth. The main factor in global warming is the increase in greenhouse gas emissions caused by the overuse of fossil fuels. In the asphalt concrete field, techniques for reducing carbon dioxide emission are actively studied in accordance with this atmosphere. Among them, the hot asphalt (Warm Mix Asphalt) paving technology that lowered the heated asphalt (HMA), which was previously produced at 160 to 180 ° C., to 30 ° C. to 130 ° C. to 150 ° C., is drawing attention.

As a rule, asphalt mixtures are produced at high temperatures of 160-180 ° C, consuming a lot of fuel. As a result, carbon dioxide and various harmful substances are generated, which causes problems in the environment and health of workers who construct asphalt pavement. In addition, there is a problem that the traffic opening time is delayed as the time for cooling the asphalt produced at 160 ~ 180 ℃ close to room temperature becomes longer. In addition, as the asphalt is produced at a high temperature, oxidation aging proceeds relatively quickly, causing early pavement cracking, and thus shortening the pavement life.

For this reason, in order to solve the problem of the heated asphalt mixture (HMA), the development of the packaging technology of WMA, which can be manufactured at a low temperature of 30 ℃ production and compaction is actively progressing. The medium-temperature asphalt mixture (WMA) reduces the production of the HMA and the compaction temperature by 30 ° C, reducing the bunker C fuel, which is the main culprit of harmful and greenhouse gases, by about 25-30%. It has the advantage of being possible to construct.

Meanwhile, the main paving technology for the medium temperature asphalt mixture (WMA) is a technique of increasing the aggregate and bonding strength by lowering the viscosity of the asphalt binder even at a low temperature of 30 ° C. One of these technologies is Sasobit wax promoted by Sasol Gmbh International. Sasobit wax is manufactured by Fischer Tropsch process to reduce the viscosity of binder with viscosity induction enhancer to reduce mixing and compaction temperature. Sasobit wax does not completely dissolve at 110 ~ 130 ℃ temperature has a problem that the dispersibility and compaction is reduced. Accordingly, there is a need to develop a material capable of completely dissolving at a temperature of 110 to 130 ° C. to secure powder separation and compaction performance.

Accordingly, an object of the present invention is to provide a low-carbon medium-temperature asphalt additive that can prevent the degradation of physical properties at low temperatures by enabling the production and compaction of the additive is completely dissolved at 30 ℃ lower than the heated asphalt mixture (HMA) to be.

In order to achieve the above object, the low carbon medium temperature asphalt additive of the present invention relates to an additive for low carbon medium temperature asphalt mixture (Warm Mix Asphalt: WMA), and as an surfactant, ethylene oxide or propylene oxide. It is characterized in that it comprises an induced amine (amine).

As such, the present invention is to produce and compact asphalt, which was generally produced at 160 to 180 ° C. even at a low temperature of 30 ° C., by including amine derived from ethylene oxide or propylene oxide in the surfactant. It is to enable this and at the same time to solve the problem of low temperature properties. In other words, by lowering the asphalt viscosity using the principle of the surfactant is a technology that can improve the asphalt performance by improving the adhesion and coating power of the aggregate even at low temperatures.

In the present invention, the above-mentioned amine derived ethylene oxide is,

R is a saturated or fluorinated, substituted or unsubstituted, optionally branched or cyclic hydrocarbon group having 1 to 30 carbon atoms, and it is reasonable to have 3 to 61 hydrogen atoms. In addition, R ¹ and R ² is characterized in that the ethylene oxide.

More preferably, the amine derived from ethylene oxide is oleyl amine derived from ethylene oxide, and its molecular formula is

It is characterized by that.

Further, in the present invention, the amine from which propylene oxide is derived,

R is a saturated or fluorinated, substituted or unsubstituted, optionally branched or cyclic hydrocarbon group having 1 to 30 carbon atoms, and it is reasonable to have 3 to 61 hydrogen atoms. In addition, R ¹ and R ² is characterized in that the propylene oxide.

In this case, more preferably, the amine derived from propylene oxide is an oleyl amine derived from propylene oxide, and its molecular formula is

It is characterized by that.

In addition, the additive of the present invention includes an amine derived from ethylene oxide or propylene oxide as a surfactant, characterized in that R is tallow (Tallow), for example, the molecular formula,

R is tallow.

In addition, the additive of the present invention may be configured to include ethylene oxide and propylene oxide derived in oleyl amine. The molecular formula is

to be. Preferably, the ratio of ethylene oxide / propylene oxide is 1: 3, and AV (Amine Value) is 33.

As described above, the additive of the present invention includes an amine derived from ethylene oxide or propylene oxide, so that the additive is dissolved in a liquid to significantly lower the surface tension, thereby improving the viscosity and fluidity of the asphalt. In other words, the additive of the present invention is divided into lipophilic moieties (hydrocarbon groups, tallow) and hydrophilic moieties (ethylene oxide and / or propylene oxide) in the molecule. In the above, the molecular assembly called micelles is formed. By this action, the surfactant is adsorbed to the interface in the dilute solution to reduce the surface tension of the asphalt binder. As a result, when the additive of the present invention is added to the asphalt mixture, asphalt can be produced and compacted at a low temperature of 30 ° C., thereby enabling low carbon generation and economical construction in terms of energy compared with existing high temperature asphalt.

In addition, the additive of the present invention is an unsaturated fatty acid is further added to the surfactant including an amine derived from ethylene oxide or propylene oxide (Propylene oxide), 12 to 20 carbon atoms and even number It may further comprise one or more surfactants selected from mixtures and combinations of linolenic acid, divinyl methane type, oleic acid, glycerides, acrylic acid, methacrylic acid.

Low carbon medium temperature asphalt additive of the present invention can be reduced by about 25 ~ 30% bunker C oil fuel, the main culprit of harmful gases and greenhouse gases by allowing the asphalt production and compaction temperature can be installed at a low temperature 30 ℃, traffic open time It has the advantage of shortening and winter construction.

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

Proper Amine Value , ratio  And molecular weight test

In this test, Samples 1 to 5 were prepared by mixing 414 kg of coarse aggregate (13 mm), 499 kg of crushed sand, 28 kg of limestone powder, 59 kg of asphalt binder, and 0.18 kg of additives, and the additive is an embodiment of the low carbon medium temperature asphalt additive of the present invention. As an surfactant, additives including oleyl amine derived from ethylene oxide and propylene oxide are used as surfactants, and as shown in Table 1, AV (Amine Value) is 33 to 40 and ethylene oxide / propylene oxide, respectively. The density (g / cm 3) based on KS F2446 and flow value (1) based on KS F2349 for each sample were included so as to include a surfactant having a ratio of 1: 1 to 1: 3 and a molecular weight of 1400 to 2000. / 100cm), and the measured Marshall stability (N) value according to KS F2349 are shown in Table 2, indirect tensile strength (N / mm2) according to KS F2376, tensile strength ratio according to KS F2398, and based on KS F2374. Dynamic Stability (times / mm) The measurement is shown in Table 3.

division Amine Value EO / PO ratio Molecular Weight One 33 1: 1 1700 2 33 1: 2 1700 3 33 1: 3 1700 4 28 1: 3 2000 5 40 1: 3 1400

division Density (g / cm 3)
(KS F2446) Flow value (1/100 cm)
(KS F 2349) Marshall Stability (N)
(KS F2349) One 2.314 32 8500 2 2.334 33 9700 3 2.367 35 13700 4 2.363 42 11800 5 2.344 33 10500

division Indirect tensile strength (N / ㎡)
(KS F2376) Tensile Strength Ratio
(KS F2398) Dynamic Stability (times / mm)
(KS F2374) One 0.7 0.65 1200 2 1.05 0.9 1560 3 1.25 1.1 1850 4 1.17 0.95 1720 5 1.12 0.93 1630

As can be seen from the test values, Samples 1 to 5 were added to the asphalt mixture by the additive of the present invention. but is can be seen that all the samples are satisfied, the flow value (1 / 100㎝) 20 to 40 and, except for sample 4 all satisfied, if tensile strength (N / ㎟) or more and a tensile strength ratio of 0.8 or more 0.75 sample It can be seen that all but 1 is satisfied. Accordingly, the additive of the present invention has an oleyl derived from ethylene oxide and propylene oxide having an ethylene oxide / propylene oxide ratio of 1: 2 to 1: 3, an AV value of 33 to 40, and a molecular weight of 1400 to 1700. It can be seen that it is preferable to include an amine (oleyl amine).

More preferably, Sample 3 shows the closest result with a density of 2.367 g / cm 3, the most fluid with a flow value of 35 1/100 cm, and also has a stability of 13700 N, indirect tensile strength of 1.25 N / mm 2, and a tensile strength ratio of 1.1. The dynamic stability is 1850 times / mm, which shows the best value in density, flowability, and strength. As a result, the additive of the present invention includes a surfactant including oleyl amine derived from ethylene oxide and propylene oxide as a surfactant, wherein the ratio of ethylene oxide / propylene oxide is 1: 3, and AV (Amine Value) is 33 and the molecular weight of 1700 ethylene oxide and propylene oxide is derived from the use of the oleyl amine (oleyl amine) derived from the use it can be seen that it is advantageous in terms of construction properties and strength after construction.

Performance by Additive Dosing

In the test, Samples 1 to 5 were prepared by mixing 414 kg of coarse aggregate (13 mm), 499 kg of crushed sand, 28 kg of limestone powder, and 59 kg of asphalt binder, to prepare an asphalt mixture. Samples 2 to 5 are samples by medium temperature asphalt mixture (WMA) in which additives are added in an amount of 0.2 to 1.0 parts by weight based on the total asphalt mixture. Here, the additive uses an additive including oleyl amine derived from ethylene oxide and propylene oxide as a surfactant as an example of the low carbon mesophilic asphalt additive of the present invention, and the results are shown in Table 4.

division Compaction temperature Additive amount density Marshall Stability One 145 ℃ - 2.363 13000 2 115 ℃ 0.2 parts by weight 2.355 13050 3 0.3 parts by weight 2.368 13700 4 0.5 parts by weight 2.357 13300 5 1.0 parts by weight 2.351 12900

As shown in the test value, Samples 2 to 4 have a density similar to that of Sample 1, and a higher value is obtained in Marshall stability. The additive is preferably 0.2 to 0.5 parts by weight based on 100 parts by weight of the asphalt mixture. When it exceeds 0.5 parts by weight it can be seen that rather unfavorable effect is derived from the density and the stability of the Marshall, the optimum addition of 0.3 parts by weight can be seen that the highest value in the density, Marshall stability.

At compaction temperature  According to heating asphalt Middle temperature  Asphalt Performance Comparison

In the present test, the comparative example of the heating asphalt mixture (HMA) according to the prior art, that is, the low carbon mesophilic asphalt additive of the present invention and the mesophilic asphalt mixture (WMA) to which the low carbon mesophilic asphalt additive of the present invention was added, Density and stability were measured and the results are shown in Table 5. Here, the heated asphalt mixture (HMA) and the medium temperature asphalt mixture (WMA) were prepared by mixing 414 kg of coarse aggregate (13 mm), 499 kg of crushed sand, 28 kg of limestone powder, and 59 kg of asphalt binder in the same manner as the above test. In addition, (WMA) used a sample prepared by adding 0.3 parts by weight of an additive. In addition, the medium temperature asphalt mixture (WMA) is an oleyl amine derived from ethylene oxide and propylene oxide as a surfactant in an additive as seen in the above test, and the ratio of ethylene oxide / propylene oxide is 1: 3, and AV (Amine Value) was 33 and the molecular weight is 1700 to include a surfactant.

Compaction temperature
(℃) HMA WMA density Stability density Stability 140 2.365 13241 2.365 13928 130 2.356 12660 2.362 13794 120 2.347 10647 2.363 13639 110 2.320 9054 2.361 12452 100 2.310 7500 2.359 12106 90 2.281 7200 2.349 11000 80 2.261 6500 2.338 10500

As can be seen from the test value, the medium-temperature asphalt mixture (WMA) has a close and stable result in density and stability according to the compaction temperature compared to the heated asphalt mixture (HMA). In the results, for example, the high temperature asphalt mixture (HMA) according to the prior art shows 2.347 and 10647 respectively at density and stability at 110 ° C, while the density and stability at 90 ° C are 2.349 and 11000, respectively. It can be seen that the medium temperature asphalt mixture (WMA) is compacted at a temperature about 30 ° C. lower than that of the conventional hot asphalt mixture (HMA).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (10)

In the additive for low carbon medium temperature asphalt mixture (Warm Mix Asphalt: WMA),
A low carbon mesophilic asphalt additive comprising amine derived from ethylene oxide or propylene oxide as a surfactant.
The method of claim 1,
The amine from which ethylene oxide is derived,

R is a saturated or fluorinated, substituted or unsubstituted, optionally branched or cyclic hydrocarbon group having 1 to 30 carbon atoms, has 3 to 61 hydrogen atoms, and R ¹ and R ² are ethylene oxide Low carbon medium temperature asphalt additive.
The method of claim 2,
The amine from which ethylene oxide is derived,
Oleyl amine derived from ethylene oxide, the molecular formula of which is

Low carbon medium temperature asphalt additive, characterized in that.
The method of claim 1,
The amine from which propylene oxide is derived,

R is a saturated or fluorinated, substituted or unsubstituted, optionally branched or cyclic hydrocarbon group having 1 to 30 carbon atoms, has 3 to 61 hydrogen atoms, and R ¹ And R ² is propylene oxide.
5. The method of claim 4,
The amine from which propylene oxide is derived,
Oleyl amine derived from propylene oxide, whose molecular formula is

Low carbon medium temperature asphalt additive, characterized in that.
The method according to claim 2 or 4,
Low carbon medium temperature asphalt additive, characterized in that T is tallow.
The method of claim 1,
Amines derived from ethylene oxide or propylene oxide as surfactants,
Ethylene oxide and propylene oxide are derived from oleyl amine, the ratio of ethylene oxide / propylene oxide is 1: 2 to 1: 3, AV (Amine Value) is 33 to 40, and molecular weight is 1400 to Low carbon medium temperature asphalt additive, characterized in that 1700.
8. The method of claim 7,
A low carbon mesophilic asphalt additive, characterized in that the ratio of ethylene oxide / propylene oxide is 1: 3, AV value is 33 and molecular weight is 1700. The method of claim 1,
The surfactant further contains unsaturated fatty acids, including at least one surfactant selected from mixtures and combinations of linolenic acid, divinyl methane type, oleic acid, glycerides, acrylic acid, methacrylic acid having 12 to 20 carbon atoms and an even number. Low carbon medium temperature asphalt additive, characterized in that.
10. The low carbon mesophilic asphalt mixture of any one of claims 1 to 9, wherein the low carbon mesophilic asphalt additive is 0.2 to 0.5 parts by weight based on 100 parts by weight of the total asphalt mixture.