KR100840055B1 - Anti-fluidity asphalt concrete mixture & method of preparation - Google Patents

Abstract

An anti-fluidity asphalt concrete mixture and a manufacturing method thereof are provided to reduce odor caused by waste tire powder by using plastic based modifier. An anti-fluidity asphalt concrete mixture includes aggregates, asphalt, high density polyethylene, low density polyethylene, and waste tire powder. The maximum grain size of the aggregate is 13mm. Based on sieve-passing weight percent, 10~100% of 13mm aggregates, 73~90% of 10mm aggregates, 40~60% of 5mm aggregates, 25~40% of 2.5mm aggregates, 11~22% of 0.6mm aggregates, 4~12% of 0.15mm aggregates, and 3~9% of 0.8mm aggregates are mixed. When it comes to aggregates, 40~65% of rough aggregates, 30~55% of fine aggregates, 3~6% of filling material are mixed. Reformed asphalt is 4.4~5.6% for the entire aggregates. The reformed asphalt's main components has 60~80((25°C,100g, 5 seconds),0.1mm) of penetration and over 250000 poise of absolute viscosity. The high density polyethylene, additives, is 2~5% for the entire asphalt amount. The low density polyethylene is 0.5~3% for the entire asphalt amount. The waste tire powder is 2~5% for the entire asphalt amount.

Description

Anti-fluidity asphalt concrete mixture ＆ method of preparation

The present invention relates to a flow-resistant asphalt mixture, and particularly to a flow-resistant asphalt mixture prepared by mixing a modifier in order to ensure the resistance performance improvement and durability due to fatigue and cracking of asphalt according to the temperature variation in summer and winter. It is about.

The deformation of the conventional asphalt pavement is interpreted as a settlement problem of each layer of pavement, which leads to the settlement of roadbed, but the problem of deformation caused by asphalt mixture is urgently solved due to the rapid increase of heavy vehicles and the occurrence of congestion section. It was soybean.

The destruction of roads is an indirect risk factor for road users, such as reduced ride comfort due to plastic deformation, increased risk of traffic accidents, and traffic congestion due to maintenance.

Therefore, in order to prevent such plastic deformation resistance and road breakage, a method of improving the properties of the SMA (Stone Mastic Asphalt) pavement and asphalt binder using the interlocking characteristics of the aggregate was applied.

To this end, the methods for improving the physical properties of asphalt binders are largely classified into a wet method (Pre-Mix) and a dry method (Plant Mix). Economic investment conditions, such as the construction of facilities, have created a burden on relatively poor manufacturers.

In addition, in the dry method, most of them are manufactured using additives such as waste tire rubber powder (CRM), SBS, and SBR, but other environmental problems such as a bad smell of burning due to deterioration by rubber powder during asphalt mixture production Is causing.

Modified asphalt binders using such modifiers have the effect of improving the mixture such as increase in viscosity, adhesion between aggregates, and improvement of low temperature cracking, but most of modified asphalt binders in Korea are rubber-based and double CRM is the total weight. It accounts for more than 80% of the percentage, there is a limit that can only improve the performance of improving the adhesion between the aggregates, and therefore, the resistance to road damage also has a limit.

Therefore, there is an urgent need to develop a highly functional asphalt binder considering the bad smell caused by the deterioration of rubber during production and the improvement of the working environment of drivers when transporting the asphalt mixture.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to improve the characteristics of the asphalt binder, such as improvement of plastic deformation resistance, improvement of low temperature crack resistance by improving the disadvantages of the existing flow-resistant asphalt pavement And the high content of CRM (waste tire rubber powder) prevents odors caused by odor generated during production, and prevents mucosal irritation and headaches of drivers during on-site transportation, and develops a new modifier to improve the working environment. It is to provide a flow resistant asphalt mixture and a manufacturing method through this excellent optimum particle size configuration.

The properties of this flow resistant asphalt mixture depend on the optimization of the particle size composition of the mixture and the modification properties of the asphalt binder. To this end, the formulation design to minimize the plastic deformation resistance was carried out by Mashall method, and the optimum formulation design was derived to develop the plastic-based modifier which is not yet introduced in Korea.

In addition, plastic-based asphalt modifiers are not currently used well in Korea, but are used mainly in PE and EVA in foreign countries. Plastic-based asphalt modifiers increase the stiffness and plastic deformation resistance of the asphalt mixture, and increase the resistance to temperature cracking by lowering the temperature sensitivity of the asphalt, thereby improving durability, plastic deformation resistance and low temperature crack resistance. To be prepared. Asphalt modifiers in plastics have no odor due to deterioration in the production of asphalt mixtures compared to rubber-based modifiers, so that drivers are prevented by the odor generated by waste tire rubber powder (CRM) that is aged in the asphalt mixture during production odor and transportation. It can solve environmental problems such as eye pain and headaches.

Accordingly, the present invention is to develop a modified asphalt binder of a plastic-based flow-resistant mixture with excellent environmental problems, plastic deformation resistance and low temperature cracking ability to escape from rubber-based asphalt modifiers distributed in Korea, and to manufacture a highly durable flow-resistant asphalt mixture and its production To provide a way.

In order to achieve the above object, the first feature of the flow resistant asphalt mixture of the present invention and the manufacturing method thereof is the aggregate maximum particle size is 13mm, 13mm 90-100%, 10mm 73-90%, Composite particle size ratio of 40-60% for 5mm, 25-40% for 2.5mm, 11-22% for 0.6mm, 7-16% for 0.3mm, 4-12% for 0.15mm, 3-9% for 0.08mm Aggregate having a coarse aggregate weight ratio of 40-65% of the total aggregate weight, fine aggregate weight ratio of 30-55%, aggregate weight ratio of 3-6%, and modified asphalt of 4.4-5.6% of the aggregate weight, the main component invaded 60 ~ 80 ((25 ℃, 100g, 5 seconds), 0.1mm), the absolute viscosity is 250,000 poise or more asphalt, high density polyethylene used as an additive is 2-5% of the total amount of asphalt, low density polyethylene 0.5-3%, the waste tire powder is characterized by having a composition containing these components by mixing modified asphalt, which is 2-5% of the total amount of asphalt.

In addition, it characterized in that it comprises the step of mixing the aggregate and the modified asphalt having a synthetic aggregate particle size and weight ratio of the first feature to contain these components.

The second feature is that the maximum particle size of the aggregate is 19mm, 19mm 90-100%, 13mm 68-84%, 10mm 56-74%, 5mm 35-55%, 2.5mm 23 Aggregate with a composite particle size ratio of -38%, 0.6mm for 10-23%, 0.3mm for 5-16%, 0.15mm for 3-12%, and 0.08mm for 2-10%. 40-65% of aggregate, 30-55% of aggregate weight, aggregate of 3-6% of filling material weight, and modified asphalt of 4.4-5.6% of aggregate weight.The main component is 60 ~ 80 ((25 ℃, 100g, 5 seconds), 0.1mm), asphalt with an absolute viscosity of more than 250,000 poise, high density polyethylene used as an additive is 2-5% of the total asphalt content, low density polyethylene is 0.5-3%, waste tire powder is total asphalt It is characterized by having a composition containing these components by mixing modified asphalt of 2-5% of the amount.

In addition, it characterized in that it comprises the step of mixing the aggregate and the modified asphalt having a synthetic aggregate particle size and weight ratio of the second feature to contain these components.

As described above, the flow-resistant asphalt mixture of the present invention and its manufacturing method have significantly improved anti-firing resistance and low temperature cracking property through excellent grasping force and point coking force improvement, and pavement surface due to plastic deformation and low temperature cracking of general asphalt pavement. To prevent the breakage of the excellent flow resistant asphalt can be manufactured, and by inventing a plastic-based modifier unlike the existing product, the odor caused by the waste tire rubber powder produced during production and related phenomena were solved.

In addition, in terms of economics, the durability of the pavement is improved, and thus there is a direct or indirect economic effect such as reduction of maintenance costs and reduction of human physical loss due to congestion and air during road maintenance.

Example 1

Flow resistant 13mm modified asphalt concrete,

In order to achieve the above objectives, when the aggregate maximum particle size is 13mm, 13mm is 90-100%, 10mm is 73-90%, 5mm is 40-60%, 2.5mm is 25-40%, 0.6 based on the percentage of sieve weight. Aggregate with a composite particle size ratio of 11-22% in mm, 7-16% in 0.3mm, 4-12% in 0.15mm, and 3-9% in 0.08mm, 45% coarse aggregate weight to total aggregate weight, fine aggregate Aggregate with 51% by weight and 4% by weight of filler and modified asphalt with 6.0% of aggregate weight.The main components are 60 ~ 80 invasion (25 ℃, 100g, 5 seconds), 0.1mm), and 250,000 absolute viscosity. High-density polyethylene used as an additive and used as an additive is 2-5% of the total asphalt, 0.5-3% of low-density polyethylene, and waste tire powder is mixed with modified asphalt of 2-5% of the total asphalt. Asphalt mixtures were prepared.

As a result of performing PG test (Performance Grade, quality test) and quality test of the modified asphalt binder thus prepared, it satisfies PG 88-22 and various quality test results satisfy the following criteria.

              Item       Quality standards   Invention Modified Asphalt Penetration Rate (25 ℃, 100g, 5s), 0.1mm 40 or more 59 Softening point, ℃ More than 70 81 Elongation (15 ℃, 5cm / min) cm 50 or more 59 Mass change rate after heating the thin film,% 0.6 or less 0.38 Permeability Residual Rate after Thin Film Heating,% 65 or more 78 Viscosity (60 ℃), Poise More than 200,000 280,000

In addition, the quality test of the flow resistant asphalt mixture prepared using the modified asphalt binder was performed according to the Korean Industrial Standards. The quality test results are as follows.

division thickness  Air mass   Underwater mass Surface dry mass  volume  density Theoretical density  Porosity  Stability   Flow value One 6.28 1164.4 675.2 1168.6 493.4 2.360 3.31 13710 30.24 2 6.12 1153.0 668.0 1154.5 486.5 2.370 2.90 13090 33.20 3 6.37 1188.7 686.1 1190.5 504.4 2.357 3.45 15910 31.52 4 6.20 1187.5 688.2 1188.5 500.3 2.374 2.76 14260 37.44 5 6.30 1167.8 677.9 1170.0 492.1 2.373 2.78 13505 43.28 6 6.22 1168.8 675.4 1170.6 495.2 2.360 3.30 14335 28.74 Average 2.365 2.441 3.11 14135 34.07

In addition, as in Example 1, the aggregate maximum particle size is 13mm, 13mm 90-100%, 10mm 73-90%, 5mm 40-60%, 2.5mm 25-40%, 0.6 based on the sieve weight percentage Aggregate with a composite particle size ratio of 11-22% in mm, 7-16% in 0.3mm, 4-12% in 0.15mm, and 3-9% in 0.08mm, with a coarse aggregate weight ratio of 40-65% Aggregate with 30-55% of aggregate weight, 3-6% of filling material weight, and modified asphalt with 4.4-5.6% of aggregate weight, with main components 60 ~ 80 ((25 ℃, 100g, 5 seconds), 0.1 mm), asphalt having an absolute viscosity of more than 250,000 poise, high density polyethylene used as an additive is 2-5% of the total asphalt content, low density polyethylene is 0.5-3%, waste tire powder is 2-5% of the total asphalt content Bringing to%; Mixing the aggregate and the modified asphalt having the above-described synthetic aggregate particle size and weight ratio so as to contain these components; It can be prepared to include.

Example 2

Flow resistant 19mm modified asphalt concrete,

When the maximum particle size of aggregate is 19mm, it is 90-100%, 13mm 68-84%, 10mm 56-74%, 5mm 35-55%, 2.5mm 23-38%, Aggregate with a composite particle size ratio of 0.6-mm at 10-23%, 0.3-mm at 5-16%, 0.15-mm at 3-12%, and 0.08-mm at 2-10%, with a coarse aggregate weight ratio of 52.1%, Aggregate with 40% by weight of aggregate and 4% by weight of filler, and modified asphalt with 6.0% of aggregate weight.The main components are 60 ~ 80 ((25 ℃, 100g, 5 seconds), 0.1mm) intrusion rate and 250,000 absolute viscosity. Asphalt is more than poise, and high density polyethylene used as an additive is mixed with modified asphalt of 2-5% of total asphalt, 0.5-3% of low density polyethylene and 2-5% of waste tire powder. A flow resistant asphalt mixture was prepared.

The quality test of the flow resistant asphalt mixture prepared using modified asphalt binder was carried out according to the Korean Industrial Standard. The quality test results are as follows.

division thickness Air mass   Underwater mass Surface dry mass  volume  density Theoretical density Porosity Stability Flow value One 6.40 1151.1 670.0 1161.9 491.9 2.340 4.99 12405 32.18 2 6.51 1142.7 658.6 1148.7 490.1 2.332 5.34 12500 29.06 3 6.20 1154.1 668.0 1164.8 496.8 2.323 5.68 10285 31.86 Average 2.345 2.463 5.34 11730 31.03

In addition, the degree of plastic deformation of the asphalt concrete pavement was measured through the repeated running test.

Accordingly, the quality test results showed that the dynamic stability greatly exceeded the standard value of 4,000 pass / mm.

         division Dynamic Stability (pass / min) Final settlement depth (mm) Flow resistant asphalt mixture 13mm 9700 0.0043 Flow resistant asphalt mixture 19mm 8670 0.0049

In addition, a counter blow loss rate test was conducted to evaluate the scattering resistance of the aggregate in the amount of asphalt design.

The experimental results are as follows.

                             Counter Blow Loss Rate Reference value Drainage Asphalt Mixture  Plain ascone mixture PQFC Flow-resistant Asphalt 20% 7.4% 15.7% 3.4%

On the other hand, in the test for evaluating the resistance performance of the aggregates by high-speed driving, it can be seen that the PQFC 13mm flow-resistant asphalt has significantly improved physical properties compared to the drainage mixture or general asphalt mixture.

Accordingly, the experimental results for the freeze-thaw resistance is as follows.

          division Indirect tensile strength before freeze thawing (kgf / cm 3) Indirect tensile strength after freeze thawing (kgf / cm 3) Freeze thaw resistance Plain asphalt mixture 7.9 5.4 0.68 PQFC Flow-resistant Asphalt Mixture 11.4 9.8 0.85

In addition, in order to evaluate the crack resistance performance due to the low temperature in winter, the results of indirect tensile strength before and after freeze-thawing on the general asphalt mixture and PQFC 13mm flow-resistant asphalt were found to exceed 0.70.

Accordingly, the experimental results for the field driving test (FCWT) are as follows.

division AP-5 PG 76-22 PQFC DS (pass / mm) 857.4 2543.8 3169.1

Through these experiments, it can be seen that even in the prototype driving test using the actual vehicle load, physical properties exceeding 25% are higher than that of the modified asphalt binder, which is 3.5 times the general asphalt mixture and PG 76-22 of similar products. .

In addition, as in Example 2, the aggregate maximum particle size is 19mm, 19mm is 90-100%, 13mm is 68-84%, 10mm is 56-74%, 5mm is 35-55%, 2.5mm on the basis of the sieve weight percentage Aggregate with a composite particle size ratio of 23-38%, 0.6mm 10-23%, 0.3mm 5-16%, 0.15mm 3-12%, and 0.08mm 2-10%. Aggregate with an aggregate weight ratio of 40-65%, fine aggregate weight ratio of 30-55%, filler weight ratio of 3-6%, and modified asphalt with 4.4-5.6% of aggregate weight. 100g, 5 seconds), 0.1mm), asphalt having an absolute viscosity of more than 250,000 poise, high density polyethylene used as an additive is 2-5% of the total asphalt, 0.5-3% of low density polyethylene, waste tire powder Making 2-5% of the total amount of asphalt; Mixing the aggregate and the modified asphalt having the above-described synthetic aggregate particle size and weight ratio so as to contain these components; It may be prepared to include a.

As a result, the flow-resistant asphalt mixture and the method of manufacturing the structure as described above is significantly improved anti-firing resistance and low-temperature cracking resistance through excellent grasping force and improved coking force, pavement by plastic deformation, low temperature cracking characteristics of ordinary asphalt pavement It prevented the breakage of the surface to make the flow-resistant asphalt with excellent durability, and unlike the existing products by inventing a plastic-based modifier to solve the odor caused by the waste tire rubber powder produced during production and related phenomena. In addition, it can be seen that in terms of economics, the durability of the pavement is improved, thereby directly or indirectly having an economic effect such as reduction of maintenance costs and reduction of human physical loss due to congestion and air during road maintenance.

Although the present invention has been described by means of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains, as well as the following claims. It should be noted that various modifications and variations can be made within the equivalent range of the range.

Claims (4)

Aggregate maximum particle size is 13mm, 13mm is 90-100%, 10mm is 73-90%, 5mm is 40-60%, 2.5mm is 25-40%, 0.6mm is 11-22%, Aggregate having a composite particle size ratio of 0.3mm in 7-16%, 0.15mm in 4-12%, and 0.08mm in 3-9%. The coarse aggregate weight ratio is 40-65% and the total aggregate weight ratio is 30-55 %, Aggregates with 3-6% by weight of the filler and modified asphalt with 4.4-5.6% of the aggregate weight, the main components of which are 60 ~ 80 ((25 ℃, 100g, 5 seconds), 0.1mm) invasiveness and 250,000 absolute viscosity. Asphalt is more than poise, and high density polyethylene used as an additive is mixed with modified asphalt of 2-5% of total asphalt, 0.5-3% of low density polyethylene and 2-5% of waste tire powder. A flow resistant asphalt mixture having a composition containing these components. Aggregate maximum particle size is 13mm, 13mm is 90-100%, 10mm is 73-90%, 5mm is 40-60%, 2.5mm is 25-40%, 0.6mm is 11-22%, Aggregate having a composite particle size ratio of 0.3mm in 7-16%, 0.15mm in 4-12%, and 0.08mm in 3-9%. The coarse aggregate weight ratio is 40-65% and the total aggregate weight ratio is 30-55 %, Aggregates with 3-6% by weight of the filler and modified asphalt with 4.4-5.6% of the aggregate weight. Asphalt of more than poise, and the high density polyethylene used as an additive is 2-5% of the total amount of asphalt, 0.5-3% of the low density polyethylene, waste tire powder is 2-5% of the total amount of asphalt; Mixing the aggregate and the modified asphalt having the above-described synthetic aggregate particle size and weight ratio so as to contain these components; Method of producing a flow-resistant asphalt mixture comprising a. Aggregate maximum particle size is 19mm, 19mm is 90-100%, 13mm is 68-84%, 10mm is 56-74%, 5mm is 35-55%, 2.5mm is 23-38%, 0.6 Aggregate with a composite particle size ratio of 10-23% in mm, 5-16% in 0.3mm, 3-12% in 0.15mm, and 2-10% in 0.08mm, and 40-65% of the coarse aggregate weight to the total aggregate weight. Aggregate with 30-55% of aggregate weight, 3-6% of filling material weight, and modified asphalt with 4.4-5.6% of aggregate weight, with main components 60 ~ 80 ((25 ℃, 100g, 5 seconds), 0.1 mm), asphalt having an absolute viscosity of more than 250,000 poise, high density polyethylene used as an additive is 2-5% of the total asphalt content, low density polyethylene is 0.5-3%, waste tire powder is 2-5% of the total asphalt content A flow resistant asphalt mixture, characterized in that the modified asphalt is mixed with a component containing these components. Aggregate maximum particle size is 19mm, 19mm is 90-100%, 13mm is 68-84%, 10mm is 56-74%, 5mm is 35-55%, 2.5mm is 23-38%, 0.6 Aggregate with a composite particle size ratio of 10-23% in mm, 5-16% in 0.3mm, 3-12% in 0.15mm, and 2-10% in 0.08mm, and 40-65% of the coarse aggregate weight to the total aggregate weight. Aggregate with 30-55% of aggregate weight, 3-6% of filling material weight, and modified asphalt with 4.4-5.6% of aggregate weight, with main components 60 ~ 80 ((25 ℃, 100g, 5 seconds), 0.1 mm), asphalt having an absolute viscosity of more than 250,000 poise, high density polyethylene used as an additive is 2-5% of the total asphalt content, low density polyethylene is 0.5-3%, waste tire powder is 2-5% of the total asphalt content Bringing to%; Mixing the aggregate and the modified asphalt having the above-described synthetic aggregate particle size and weight ratio so as to contain these components; Method of producing a flow-resistant asphalt mixture comprising a.