KR101100416B1 - Warm-mix asphalt additive containing anti-stripping effects and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A warm-mix additive for a middle temperature asphalt mixture containing an exfoliation preventing composition, and a producing method thereof are provided to reduce the production and construction temperature of the middle temperature asphalt mixture. CONSTITUTION: A warm-mix additive for a middle temperature asphalt mixture contains the following: 100 parts of polyethylene wax by weight; 10-60 parts of modified fatty acid by weight having the melting point of 110-140 deg C, obtained by melt-reacting fatty acid including 12-24 carbons with calcium hydroxide, magnesium hydroxide, zinc hydroxide, or zinc oxide; and 10-60 parts of viscosity improver by weight.

Description

Medium warming additive for medium temperature asphalt mixture with anti-peeling property and its manufacturing method {WARM-MIX ASPHALT ADDITIVE CONTAINING ANTI-STRIPPING EFFECTS AND MANUFACTURING METHOD THEREOF}

The present invention relates to a mesophilic additive for mesophilic asphalt mixture having a peeling prevention composition and a method of manufacturing the same, and more particularly, to reduce the production and construction temperature of mesophilic asphalt mixture, and to improve the moisture sensitivity of the asphalt mixture. The present invention relates to a mesophilic additive for mesophilic asphalt mixture having an anti-peel composition and a method for producing the same.

Asphalt mixtures are commonly referred to as ascones, and after the addition of asphalt, aggregates, fillers, etc. to an asphalt mixing plant, these materials are placed at 160-180 ° C. After being manufactured by heating to a high temperature, the process is cooled to room temperature in the road installation and compaction process.

Therefore, not only a large amount of energy is required for high temperature heating, but there is a problem that emissions of harmful gases such as carbon dioxide, sulfur oxides, and nitrogen oxides increase during the manufacture and construction of the asphalt mixture. In addition, since the road paving takes a long time to cool the high temperature asphalt mixture to room temperature, there is a problem that the traffic opening time is delayed, and workers are exposed to the risk of safety accidents.

Recently, in order to solve this problem, Warm-Mix Asphalt Mixture (WMA), which mixes and compacts the asphalt mixture at a temperature of 20 to 40 ° C. lower than that of a conventional heated asphalt mixture (HMA), has been developed. There is an active research on.

As such a medium-temperature asphalt mixture, an asphalt mixture using polyethylene wax-based sasobit manufactured by Fischer Tropsch Synthesis method is known. Sasobit is a compound that is solid at room temperature, and melts and turns into a fluid when the temperature is increased. It rapidly drops the viscosity of the asphalt above the melting temperature and solidifies below the melting temperature, thereby adding an additive to improve the performance of the medium-temperature asphalt mixture. Has been used as.

However, according to such a medium-temperature asphalt mixture paving technology, since the aggregate is heated at a lower temperature than the conventional heated asphalt mixture, there is a limit in removing moisture present in the aggregate during the manufacture of the asphalt mixture, and the asphalt viscosity is relatively high. Disadvantageous for aggregate coating.

As a result, the intermediate asphalt mixture is less sensitive to moisture than the heated asphalt mixture, so the cohesion and adhesion between the aggregate and the asphalt are weakened by the water entering the asphalt pavement, causing the aggregate and the asphalt to desorb. do. As a result, pavement breakage problems such as labeling, potholes, plastic deformation, and cracking are generated due to the stress generated by the traffic load and the environmental load.

Therefore, there is a need to develop a mesophilic additive that can increase the long-term durability of the asphalt mixture by improving moisture sensitivity in the mesophilic asphalt mixture.

The present invention improves the long-term durability by improving the moisture sensitivity of the asphalt mixture while lowering the viscosity such that the optimum viscosity of the asphalt mixture is expressed at a lower temperature than the heated asphalt mixture, and the optimum compaction density is expressed at a temperature lower than the heated asphalt pavement. It is an object of the present invention to provide a neutralizing additive for a medium-temperature asphalt mixture having an anti-peeling composition, and a method of manufacturing the same.

The mesophilic additive for mesophilic asphalt mixture having the anti-peel composition of the present invention for solving the above problems is iii) polyethylene wax; Ii) 10 to 60 parts by weight of modified fatty acid based on 100 parts by weight of the polyethylene wax; And iii) 10 to 60 parts by weight of a viscosity improver based on 100 parts by weight of the polyethylene wax.

In addition, the method for producing a mesophilic additive for mesophilic asphalt mixture having an anti-peel composition of the present invention is iii) polyethylene wax, 10 to 60 parts by weight of 12 to 24 carbon atoms fatty acid and the polyethylene wax with respect to 100 parts by weight of the polyethylene wax Melt mixing 10 to 60 parts by weight of the viscosity improver based on 100 parts by weight; Ii) adding and stirring at least one selected from the group consisting of 10 to 20 parts by weight of calcium hydroxide, magnesium hydroxide, zinc hydroxide and zinc oxide to 100 parts by weight of the fatty acid; And iii) shaping the stirred melt mixture.

According to the neutralizing additive of the present invention, the asphalt mixture preparation and construction temperature can be lowered by about 20 to 40 ° C. as compared to the conventional method, thereby minimizing the emission of carbon dioxide and harmful substances.

In addition, it is possible to significantly improve the long-term durability of the asphalt mixture by significantly improving the moisture sensitivity, which is a problem of the conventional neutralizing additives, and preventing pavement damage due to the detachment of asphalt and aggregate.

Furthermore, the neutralizing additive of the present invention can be applied to both dry and wet type asphalt mixtures, and can be usefully applied to various asphalt paving methods.

Hereinafter, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the technical idea of the present invention.

The mesophilic additive for mesophilic asphalt mixture having the anti-peel composition according to an embodiment of the present invention is iii) polyethylene wax; Ii) 10 to 60 parts by weight of modified fatty acid based on 100 parts by weight of the polyethylene wax; And iii) 10 to 60 parts by weight of a viscosity improver based on 100 parts by weight of the polyethylene wax.

Polyethylene wax contained in the mesophilic additive for mesophilic asphalt mixture having the anti-peel composition of the present invention rapidly drops the viscosity of the asphalt above the melting temperature of the wax, and solidifies below the melting temperature of the meso asphalt mixture. Used as an additive to enhance performance.

It is preferable that polyethylene wax has melting | fusing point of 95-125 degreeC, and melt viscosity in 140 degreeC is 80-400 cPs.

If the melting point of the polyethylene wax is less than 95 ° C, the stiffness of the asphalt may be weakened when mixed with the asphalt. If the melting point is more than 125 ° C, the polyethylene wax may not be sufficiently dispersed in the asphalt during the manufacture of the medium-temperature asphalt mixture, which may cause deterioration of physical properties. .

In addition, when the melt viscosity of the polyethylene wax at 140 ° C. is less than 80 cPs, the high temperature property is weakened and is not suitable as road pavement asphalt. When the melt viscosity at 140 ° C. exceeds 400 cPs, the viscosity of the asphalt is too high to be moderate. In the manufacture and packaging of asphalt mixtures, problems may occur that are not properly performed.

The modified fatty acid included in the mesophilic additive for mesophilic asphalt mixture having the anti-peel composition of the present invention serves to improve the moisture sensitivity of the asphalt mixture while supplementing the mesophilic function of the polyethylene wax.

The modified fatty acid is preferably included in an amount of 10 to 60 parts by weight based on 100 parts by weight of polyethylene wax. When the modified fatty acid content is less than 10 parts by weight based on 100 parts by weight of polyethylene wax, the effect of improving moisture sensitivity and neutralizing function is insignificant, and when it exceeds 60 parts by weight, there is a problem of lowering the high temperature properties of the asphalt.

The modified fatty acid is preferably obtained by melting and reacting a fatty acid having 12 to 24 carbon atoms with at least one selected from the group consisting of calcium hydroxide, magnesium hydroxide, zinc hydroxide and zinc oxide in view of improving the moisture sensitivity of the asphalt mixture.

In addition, the modified fatty acid preferably has a melting point in the range of 110 to 140 ° C. When the melting point of the modified fatty acid is out of the above range and higher than the production temperature of the asphalt mixture, the neutralizing function supplementation effect and the water sensitivity improvement effect cannot be obtained.

Modified fatty acids can be prepared in-situ in the preparation of the neutralizing additive for mesophilic asphalt mixtures having the anti-peel composition of the invention. Specifically, the modified fatty acid is melt-mixed polyethylene wax, 10 to 60 parts by weight of fatty acid having 12 to 24 carbon atoms with respect to 100 parts by weight of the polyethylene wax and 10 to 60 parts by weight of viscosity improving agent based on 100 parts by weight of the polyethylene wax, The mixture may be prepared by adding at least one selected from the group consisting of 10 to 20 parts by weight of calcium hydroxide, magnesium hydroxide, zinc hydroxide and zinc oxide to 100 parts by weight of the fatty acid.

The viscosity improving agent included in the neutralizing additive for mesophilic asphalt mixture having the anti-peel composition of the present invention enhances the mesophilic function of polyethylene wax, and serves to prevent the low temperature properties of the asphalt.

The viscosity improving agent is preferably included in an amount of 10 to 60 parts by weight based on 100 parts by weight of polyethylene wax. When the content of the viscosity improving agent is less than 10 parts by weight based on 100 parts by weight of polyethylene wax, the effect of improving the low temperature properties and viscosity of the asphalt is insignificant, and when it exceeds 60 parts by weight, there is a problem of lowering the high temperature properties of the asphalt.

The viscosity improving agent is preferably at least one selected from the group consisting of stearic acid, palm wax, palm oil, paraffin wax and polyolefin wax.

Palm wax is preferably a palm wax obtained through a hydrogenation process of the wax obtained from vegetable palm oil extracted from the palm fruit, the melting temperature is 55 ~ 65 ℃.

The paraffin wax has a melting temperature of 50 to 65 ° C and a melt viscosity at 100 ° C of 1 to 10 cPs.

It is preferable that melting | fusing point of a polyolefin pin wax is 60-115 degreeC, and melt viscosity in 140 degreeC is 10-80 cPs.

In addition, the neutralizing additive for mesophilic asphalt mixture having the anti-peel composition of the present invention may further include at least one selected from the group consisting of antioxidants, heat stabilizers, antistatic agents and lubricants.

On the other hand, the method for producing a moderate temperature additive for mesophilic asphalt mixture having an anti-peel composition according to another embodiment of the present invention is i) polyethylene wax, 10 to 60 parts by weight of carbon number 12 to 24 parts by weight based on 100 parts by weight of the polyethylene wax Melting and mixing 10 to 60 parts by weight of a viscosity improving agent based on 100 fatty acids and 100 parts by weight of the polyethylene wax; Ii) adding and stirring at least one selected from the group consisting of 10 to 20 parts by weight of calcium hydroxide, magnesium hydroxide, zinc hydroxide and zinc oxide to 100 parts by weight of the fatty acid; And iii) shaping the stirred melt mixture.

(Iii) Melting and mixing the polyethylene wax, fatty acid and viscosity improving agent is preferably performed at a temperature of 140 ~ 200 ℃.

In one embodiment, step iii) may further comprise mixing one or more selected from the group consisting of antioxidants, heat stabilizers, antistatic agents and lubricants.

Stirring in step ii) can take place between 30 minutes and 4 hours, preferably about 2 hours.

In addition, the method may further include cooling the stirred melt mixture after step ii).

The shaping of step iii) may be accomplished by molding into a predetermined form such as pellet form or plate form using a conventionally known molding method.

The mesophilic additive for mesophilic asphalt mixture having the anti-peel composition of the present invention can lower the asphalt mixture production and construction temperature by 20 ~ 40 ℃ compared to the conventional method, can minimize the emission of carbon dioxide and harmful substances, dry and It can be applied to both wet type asphalt mixtures and can be usefully applied to various asphalt pavement methods.

In addition, it is possible to improve the long-term durability of the asphalt mixture by improving the moisture sensitivity, which is a problem of the conventional neutralizing additive, to prevent pavement damage due to the detachment of asphalt and aggregate.

Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are merely illustrative of the present invention, and the scope of the present invention is not limited to the following examples.

[Example]

(1) Experimental material

AP: Asphalt with a grade of invasion of 60 to 80 (infiltration degree 70, PG64-22).

PE wax: polyethylene wax having a melting point of 114 ° C. and a viscosity of 140 ° C. of 200 cPs and a specific gravity of 0.93.

PE-H wax: Polyethylene wax with melting point of 120 ° C. and 140 ° C. of 500 cPs and specific gravity 0.93.

Paraffin Wax: A paraffin wax having a viscosity of 6 cPs at a melting point of 60 ° C. and 100 ° C.

Modified fatty acid: A modified fatty acid having a melting point of 120 ° C. obtained by using a 20-carbon-carbon fatty acid and zinc hydroxide prepared according to the method for producing a neutralizing additive of the present invention.

Modified fatty acid-H: A modified fatty acid having a melting point of 160 ° C. obtained by using a 20-carbon C fatty acid and sodium hydroxide prepared according to the method for producing a neutralizing additive of the present invention.

Fatty acid-ca: A modified fatty acid prepared separately by reacting a 20-carbon carbonic acid with calcium hydroxide, not according to the method for producing a neutralizing additive of the present invention.

Sasobit ^® : A neutralizing additive in wax form with a viscosity of 40 cPs at 112 ° C. and 140 ° C. sold by Sasol.

(2) Evaluation of binder properties of asphalt

Performance evaluation of the asphalt containing the neutralizing additive of the present invention was evaluated based on the PG test.

In order to evaluate the low temperature properties, the asphalt was measured by PAV (Pressure Aging Vessel), and then m-value was measured by BBR (Bending Beam Rheometer). In the BBR test, when the m-value is more than 0.3, the low-temperature properties of asphalt can be evaluated as excellent. If the m-value is less than 0.3, the low-temperature property of asphalt is not good, and it is vulnerable to fatigue and cracking, so it is used in low temperature areas. This may be limited.

In order to evaluate the high temperature properties, asphalt mixed with aggregate at high temperatures in the initial plant during the production of ascon, and then subjected to the Rolling Thin Film Oven Test (RTFO), which simulates the aging of the process of moving and laying the site, is subjected to DSR (Dynamic). Shear Rheometer) was used to measure G * / sinδ at 64 ° C. If the G * / sinδ value is lower than 2.2 kPa at 64 ° C, the plastic deformation resistance is not good at high temperatures, and thus it is difficult to be applied to the road.

Polyethylene wax and viscosity improving agent were mixed according to the composition shown in Table 1 to prepare a neutralizing additive, and then this neutralizing additive was mixed with asphalt. At this time, the asphalt content in the asphalt binder was 97% by weight. The prepared asphalt binder was subjected to BBR test after PAV, and DSR test after RTFO. Table 1 shows the composition ratio of the polyethylene wax and the viscosity improving agent and the measured values. The content of each component described in Table 1 is expressed in parts by weight of each component relative to 100 parts by weight of polyethylene wax.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Neutralization additive composition ratio PE wax 100 100 100 100 100 Paraffin wax 20 40 - 70 20 Modified fatty acids 30 30 30 30 70 Neutralization additive amount (% by weight) 3 3 3 3 3 Asphalt usage (% by weight) 97 97 97 97 97 m-value 0.32 0.34 0.28 0.36 0.34 G * / sinδ (64 ° C., kPa) 2.5 2.3 2.8 2.0 2.0

As shown in Table 1, in Examples 1 and 2, the m-value value is 0.3 or more, which is excellent in low temperature physical properties of asphalt, has strong crack resistance after aging, and the G * / sinδ value is higher than 2.2 kPa, thereby causing plastic deformation. The resistance was excellent. On the other hand, Comparative Example 1 has excellent plastic deformation resistance, but the m-value is less than 0.3, the low temperature properties of the asphalt is not good, it can be confirmed that the use in the low temperature region is vulnerable to fatigue and cracking. In addition, in Comparative Examples 2 and 3 it can be seen that the low temperature physical properties of the asphalt, but the plastic deformation resistance is very low.

(3) Preparation of neutralizing additives and asphalt mixtures

Polyethylene wax, a fatty acid having 20 carbon atoms, and a viscosity improver were added to a vessel equipped with a stirrer controlled at 140 to 200 ° C., followed by melt mixing. Zinc hydroxide or sodium hydroxide was added thereto, followed by stirring for about 2 hours. After the cooling process was prepared to the neutralizing additives of Examples 3 to 6, and Comparative Examples 4 and 5 in the form of pellets. After the neutralization additive prepared above was added to the asphalt heated to 130 ° C. and uniformly mixed, the mixtures of asphalt and the neutralizing additive were added to the aggregate heated to 130 ° C. and mixed to compare Examples 3 to 6, and the comparison. Asphalt mixtures of Examples 4 and 5 were prepared. The sum of the amounts of asphalt and neutralizing additives added was 5.3% by weight based on the total weight of the asphalt mixture.

Comparative Example 6 is an asphalt mixture prepared at 130 ° C. using commercially available additive sasobit, and Comparative Example 7 is a straight asphalt mixture prepared at 160 ° C. without using an additive.

Comparative Example 8 uses modified fatty acids prepared according to the method for preparing a neutralizing additive of the present invention. Specifically, polyethylene wax, paraffin wax and modified fatty acid (fatty acid-ca) are evenly distributed on asphalt heated to 130 ° C. After mixing, the asphalt mixture of Comparative Example 8 was prepared by adding a mixture of asphalt and a neutralizing additive to the aggregate heated to 130 ° C. The sum of the amounts of asphalt and neutralizing additives added was 5.3% by weight based on the total weight of the asphalt mixture.

The composition ratio of each component of the neutralization additive, the amount of asphalt and the neutralization additive used, and the preparation temperature of the mixture are shown in Tables 2 and 3 below. The content of each component described in Tables 2 and 3 is expressed in parts by weight of each component relative to 100 parts by weight of polyethylene wax, and the amount of asphalt and the neutralizing additive is expressed based on the sum of the amount of the asphalt and the neutralizing additive.

(4) performance evaluation of asphalt mixture

The neutralization effect of the asphalt mixture thus prepared was evaluated by measuring porosity and dynamic stability after compaction. If the porosity is the same or lower than that of the asphalt mixture compacted at 160 ° C without using a neutralizing additive, the compaction property is evaluated as excellent.

In addition, the moisture sensitivity of the asphalt mixture is saturated by the vacuum mixture according to the AASHTO T-238 method, followed by freeze-thaw treatment, and measure the indirect tensile strength (IDT) before and after the water treatment. It evaluated as the ratio (Tensile Strength Ratio; TSR). If the difference in indirect tensile strength before and after the water treatment is small, it is evaluated as having excellent water sensitivity.

Dynamic Immersion Test (DIT) is the most basic method for assessing the adhesion of aggregates and asphalt to assess moisture sensitivity.It is mainly used in Europe and prevents road breakage such as portholes and peeling that may occur during rainy weather. Test method used to predict. In the present invention, the dynamic immersion test was carried out according to the test rule of PrEN-12697-11, which is a European regulation, and analyzed the degree of aggregate coating through three or more visual inspections, and at the same time, the weight loss rate caused by the peeling of the asphalt from the aggregate was analyzed. Moisture sensitivity was evaluated by measuring.

Both the TSR method and the dynamic immersion test method in evaluating moisture sensitivity have the disadvantage that they cannot simulate the variables generated in the field as the test method performed indoors. In comparison, MMLS3 (Model Mobile Load Simulation 3) can be applied to 1/3 of the vehicle load generated in the field, and the same vehicle load can be applied even when immersed. It can be equipment. Tests using MMLS3 were conducted with the water immersion temperature set at 54 ° C to maximize the moisture damage of the asphalt mixture, and the vehicle loaded at 2.7 psi. Moisture sensitivity was evaluated by measuring the deflection of asphalt mixture due to vehicle load and the weight loss rate caused by aggregate detachment and peeling.

The evaluation results are shown in Tables 2 and 3.

Example 3 Example 4 Example 5 Example 6 Mesophilic additive
Creation costs
PE wax 100 100 100 100 Paraffin wax 20 20 20 20 Modified fatty acids 30 30 50 50 Neutralization additive amount (% by weight) 2 3 2 3 Asphalt usage (% by weight) 98 97 98 97 Mixture manufacturing temperature (℃) 130 130 130 130 Porosity (%) 3.9 3.8 3.8 3.7 Dynamic Stability (times / mm) 1,800 2,100 1,700 2,300 TSR (%) 83 85 84 86 Dynamic Immersion Test (DIT) Weight loss rate (%) 60.2 37.3 62.8 40.1 Visual survey (%) 64 38 60 39 Model Mobile Load System 3 (MMLS3) Deflection amount (mm) 2.414 2.262 2.389 2.113 Weight loss rate (%) 6.9 5.7 6.2 5.4

Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8

Mesophilic additive
Creation costs
PE wax - 100 - - 100 PE-H wax 100 - - - - Paraffin wax 20 20 - - 20 Modified fatty acids 30 - - - - Modified Fatty Acids-H - 30 - - - Fatty Acid-Ca - - - - 30 Trivial - - 100 - - Neutralization additive amount (% by weight) 3 3 3 0 3 Asphalt usage (% by weight) 97 97 97 100 97 Mixture manufacturing temperature (℃) 130 130 130 160 130 Porosity (%) 4.5 4.2 3.9 4.0 4.5 Dynamic Stability (times / mm) 600 800 1,400 700 620 TSR (%) 55 62 60 80 56 Dynamic Immersion Test (DIT) Weight loss rate (%) 73.4 71.2 84.9 74.8 76.2 Visual survey (%) 73 74 88 77 78 Model Mobile Load System 3 (MMLS3) Deflection amount (mm) 2.994 3.015 3.146 2.858 2.868 Weight loss rate (%) 11.5 11.8 12.5 10.8 10.2

1) Evaluation of neutralization effect

As can be seen from Tables 2 and 3, Examples 3 to 6 exhibited low porosity and high dynamic stability values compared to Comparative Example 7 without using the neutralizing additive. From this, in the case of Examples 3 to 6 it can be confirmed that the compaction performance and mesophilic performance of the asphalt mixture is excellent. Therefore, the use of such a neutralizing additive of the present invention can exhibit excellent physical properties even when producing an asphalt mixture at a low temperature.

In addition, comparing Comparative Example 4 using high-viscosity polyethylene wax with Example 4 using the neutralizing additive according to the present invention, in Comparative Example 4, the porosity value is high, the compaction performance is lowered, and the dynamic stability value is low. have.

In addition, comparing Comparative Example 5 using a modified fatty acid having a high melting point and Example 4 using a neutralizing additive according to the present invention, Comparative Example 5 shows a higher porosity value and a lower dynamic stability value compared to Example 4 , The lowering of the neutralization effect, it can be seen that the physical properties are poor when producing the asphalt mixture at a low temperature.

On the other hand, Comparative Example 6 using commercially available neutralizing additive sasobit can be seen to exhibit high dynamic stability and excellent compaction characteristics.

In addition, Comparative Example 8 and Example 4 prepared by separately mixing polyethylene wax, paraffin wax, and modified fatty acid (fatty acid-ca) with asphalt, according to the method for preparing the neutralizing additive of the present invention, Example 4 prepared according to the neutralization additive manufacturing method was well made, while Comparative Example 8 can be confirmed that the compaction is not made.

2) Moisture Sensitivity Evaluation

Comparing the TSR values of Examples 3 to 6 and Comparative Examples 4 and 5 from Tables 2 and 3, Comparative Examples 4 using high viscosity polyethylene wax or Comparative Example 5 using modified fatty acids having high melting points Compared with the low TSR value, it can be confirmed that the moisture sensitivity is excellent.

In addition, when the TSR values of Examples 3 to 6 and Comparative Examples 6 and 7 were compared, Examples 3 to 6 were compared with Comparative Example 6 using Sasobit, which is a commercially available neutralizing additive, or Comparative Example 7, without using an additive. Low TSR values indicate good moisture sensitivity. In particular, in the case of Comparative Example 6 using a small bit, but excellent in the neutralization effect such as dynamic stability and compaction characteristics, it can be seen that the moisture sensitivity is inferior.

According to the results of the dynamic immersion test and the MMLS3 test, it can be seen that the moisture sensitivity of Examples 3 to 6 is significantly increased compared to Comparative Examples 4 to 8. Particularly, from the weight loss rate in the dynamic numerical test, that is, the aggregate film peeling test result, the water sensitivity was increased by about 10% when 2% of the neutralizing additive of the present invention was added, and by about 50% when 3% was added. You can check it.

In addition, according to the results of the deflection and weight loss test results of MMLS3, Comparative Example 6 using sasobit showed higher dynamic stability than other comparative examples in the condition where moisture was not penetrated, but results from the experiment by artificially adding moisture damage According to, it can be seen that not only the deflection of the vehicle load but also the weight loss rate is drastically reduced.

In addition, the neutralizing additive of the present invention was found to be about 2 times lower than the amount of deflection caused by the vehicle load in the immersion state than the comparative example that is currently commercialized and used, which withstands the vehicle load even during the process of water damage That means that the adhesion and adhesion, aggregate engagement, etc. can occur.

In addition, comparing Example 4 and Comparative Example 8, it can be seen that Example 4 prepared according to the neutralizing additive manufacturing method of the present invention has excellent moisture sensitivity compared to Comparative Example 8 prepared by mixing each component individually Can be.

Therefore, according to the neutralizing additive of the present invention, when manufacturing and constructing the asphalt mixture at a temperature of 20 to 40 ° C. lower than that of the conventional paving method, excellent physical properties can be secured, and moisture sensitivity can be improved.

The present invention is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be apparent to those who have knowledge.

Claims (12)

Iii) polyethylene wax;
Ii) a melting point of 10 to 60 parts by weight based on 100 parts by weight of the polyethylene wax by melting and reacting at least one fatty acid having 12 to 24 carbon atoms with at least one member selected from the group consisting of calcium hydroxide, magnesium hydroxide, zinc hydroxide and zinc oxide Modified fatty acids in the range of ˜140 ° C .; And
Iii) 10 to 60 parts by weight of a viscosity improving agent based on 100 parts by weight of the polyethylene wax
Medium temperature additive for medium temperature asphalt mixtures with anti-separation properties.
The method of claim 1,
The polyethylene wax has a melting point of 95 ~ 125 ℃, characterized in that the melt viscosity at 140 ℃ 80 ~ 400 cPs
Medium temperature additive for medium temperature asphalt mixtures with anti-separation properties.
delete delete The method of claim 1,
The viscosity improving agent is characterized in that at least one selected from the group consisting of stearic acid, palm wax, palm oil, paraffin wax and polyolefin wax.
Medium temperature additive for medium temperature asphalt mixtures with anti-separation properties.
The method of claim 5,
The polyolefin wax has a melting point of 60 ~ 115 ℃, characterized in that the melt viscosity at 140 ℃ 10 ~ 80 cPs
Medium temperature additive for medium temperature asphalt mixtures with anti-separation properties.
The method of claim 1,
It further comprises one or more selected from the group consisting of antioxidants, heat stabilizers, antistatic agents and lubricants
Medium temperature additive for medium temperature asphalt mixtures with anti-separation properties.
Iii) melt mixing polyethylene wax, 10 to 60 parts by weight of fatty acid having 12 to 24 carbon atoms per 100 parts by weight of polyethylene wax and 10 to 60 parts by weight of viscosity improving agent based on 100 parts by weight of polyethylene wax;
Ii) adding and stirring at least one selected from the group consisting of 10 to 20 parts by weight of calcium hydroxide, magnesium hydroxide, zinc hydroxide and zinc oxide to 100 parts by weight of the fatty acid; And
Iii) shaping the stirred melt mixture;
Method for producing a mesophilic additive for mesophilic asphalt mixture having anti-peel properties.
The method of claim 8,
The step iii) is made at a temperature of 140 ~ 220 ℃
Method for producing a mesophilic additive for mesophilic asphalt mixture having anti-peel properties.
The method of claim 8,
The step iii) further comprises mixing at least one selected from the group consisting of antioxidants, heat stabilizers, antistatic agents and lubricants.
Method for producing a mesophilic additive for mesophilic asphalt mixture having anti-peel properties.
The method of claim 8,
Step ii) is made for 30 minutes to 4 hours
Method for producing a mesophilic additive for mesophilic asphalt mixture having anti-peel properties.
The method of claim 8,
After step ii), further comprising cooling the stirred melt mixture.
Method for producing a mesophilic additive for mesophilic asphalt mixture having anti-peel properties.