KR20010079274A - Method for manufacturing and drainage asphalt - Google Patents

Abstract

PURPOSE: A drainage asphalt is provided to enhance arsenate resistance, weather resistance, water resistance, fluidity resistance and strength of aggregate, and to improve security for driving vehicles. CONSTITUTION: A drainage asphalt is manufactured by adding 4.5-5.5 wt.% of thermoplastic styrene-butadiene-styrene copolymer having the average molecular weight of 70,000-110,000 by weight of asphalt to the aggregate mixture comprising 85-87 wt.% of aggregate, 8-10 wt.% of sand, and 4.5-5.5 wt.% of filler. Then, 11-13 wt.% of modifier is additionally added in order to manufacture modified asphalt with a high viscosity. Preferably, the viscosity of the modified asphalt at 60 deg.C is 200,000 poises and over.

Description

Drainage asphalt and its manufacturing method {METHOD FOR MANUFACTURING AND DRAINAGE ASPHALT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to drainage paving asphalt, in which a modifier containing a thermoplastic elastomer, styrene-butadiene-styrene copolymer, is added to improve physical properties in the manufacture of drainage asphalt for paving roadways having high porosity. The present invention relates to a drainage asphalt having a high porosity and a method for producing the same, wherein the aggregate is composed of coarse aggregate as a main component. More specifically, water that has penetrated the drainage layer from the road surface during rainy weather flows to the drainage facility quickly by using drainage asphalt having high porosity in the surface layer or the surface layer and the base layer and installing an impermeable layer thereunder. The characteristics of the present invention are to provide drainage asphalt which exhibits excellent scattering resistance, weather resistance, water resistance, and flow resistance of aggregates.

In general, general asphalt composition (density mixture) has a low porosity (3-6%), so the drainage function in the rain is low, the vehicle running safety due to water pooling, and the ratio of coarse aggregates has a weak durability because it is low. . In addition, due to the high flow resistance, the plastic deformation is likely to be high, and the wear resistance is small.

Accordingly, an object of the present invention for solving the above problems is to provide a pavement drainage asphalt for road pavement and its manufacturing method that can improve the drainage function in rainy weather, and improve the vehicle running safety.

The present invention according to the first aspect for achieving the above object is weight average compared to the amount of asphalt of 4.5 to 5.5% in the aggregate formulation of 85 to 87% of coarse aggregate, 8 to 10% of sand, 4.5 to 5.5% of filling material A method for producing drained asphalt consisting of a process for producing modified asphalt having high viscosity by adding 11 to 13% of a modifier mainly composed of a thermoplastic styrene-butadiene-styrene copolymer having a molecular weight in the range of 70,000 to 110,000 is implemented.

At this time, more preferably, a drainage asphalt to which a modifier having a viscosity at 60 ° C. of 200,000 or more is added is implemented.

Hereinafter, preferred embodiments of the present invention will be described in detail. It should be noted that in the following description, only parts necessary for understanding the present invention will be described, and descriptions of other parts will be omitted so as not to obscure the subject matter of the present invention.

Looking at the concept of the present invention implemented first, the main purpose is to ensure the safety of the vehicle driving in the rain and to produce a drainage asphalt composition that can be drained quickly without the occurrence of water film phenomenon on the road surface. That is, the present invention has a styrene-butadiene-styrene having a weight average molecular weight in the range of 70,000 to 110,000 with respect to the amount of asphalt having a maximum particle size of 10 to 15 mm, preferably 13 mm of aggregate and sand, and 4.5 to 5.5% of asphalt in the filler blend. Improved bonding strength and internal friction angle and strength of the mixture by adding 11-13% of a modifier based on a linear block copolymer as a main component and mixing high viscosity modified asphalt having a viscosity of 200,000 poise or more at 60 ° C. It is to propose a drainage asphalt having a porosity of about 20 to 27% with an increase and a method of manufacturing the same.

As described above, according to the present invention, since the ratio of rain on the road surface penetrates through the pores of the surface asphalt and is drained through the base layer beneath it, it must maintain the same physical properties as the existing surface layer while having a large porosity. In addition, since it has a large void, it is more susceptible to water, air, and sunlight than conventional asphalt, and thus, physical properties required for drainage asphalt shown in Table 1 must be satisfied.

Table 1 Properties required for drainable asphalt compositions

Item City method division Composition asphalt Scattering of aggregates ① Use asphalt with strong grasp of aggregate (large Tarunes, Ternity) ② Increase the coating of binder. (Use of high viscosity binder, plant fiber MC) ③ Improve low temperature embrittlement. use) 4.5% ?? As amount of MC can be combined 20% Toughness 200kgf cmTurnant 150kgfcm -20 ℃ Flow of mixture ①We use asphalt with strong grasp of aggregate (big toughness, largeness) ②We use high viscosity binder. (We raise viscosity of 60 degrees Celsius.) Stability ?? 500㎏f ・ cmDS ?? 1500 (times / mm) Toughness 200 kgf cm Size 150 kg f cm 60 ℃ Viscosity 200,000 poise Peeling of asphalt ① Use binder with large peeling resistance ② Use parallel with lime ③ ③ Increase the size of binder. Peeling rate by immersion WT ?? 5% lime can be used together Peeling rate of coarse aggregate ?? 5% Asphalt deterioration ① Increase the coating of the binder. 4.5% ?? As amount ?? 5.5% Decreased drainage performance (pore clogging) ① Increase the design void. ② Reduce the flow of asphalt during construction. (High viscosity, use plant fiber MC) ③ Increase the deformation resistance of the mixture. Porosity> 15% Permeability coefficient 10 ^-2 cm / sMC Possible DS 1,500 (times / mm) 60 ℃ Viscosity 200,000 poise Softening point 70 ℃

In the actual construction of drainage asphalt, an impermeable layer is installed directly underneath. An impermeable layer often uses a dense heated asphalt mixture or cement system, but when the pavement installed by cutting overlay is used as a drainage pavement, it may be used actively if the already installed layer is impermeable. In order to improve the adhesion between the upper and lower layers and to improve impermeability, the asphalt coating agent containing rubber as a top coat is generally applied at about 0.4 to 0.6 l / m 2.

On the other hand, since the drainage asphalt pavement is intended as a roadway, the water does not penetrate into the subgrade so that the strength of the subgrade or less is not lowered.

The drainage asphalt pavement can be drained quickly to drainage facilities (drainage, sideways, etc.) such as to secure the gradient (inclined) of the upper surface of the impermeable layer, flatness and, if necessary, install an underground drainage hole to fully exhibit the drainage function. It is a structure. In addition, the materials used should be selected to maintain the durability and durability of the drainage pavement. In particular, the quality, shape, and particle size of the aggregates greatly affect the physical properties of the drainage asphalt composition. . The coarse aggregate should be uniform and clean and very hard and durable while not containing harmful substances such as flat stones, rubbish, mud and organic matter.

Fine aggregates are made of artificial sand, natural sand, screening goose, and special sand, and the filling material is, in principle, limestone containing 1% or less of water from which limestone is crushed.

Hereinafter, the present invention will be described in detail based on the preferred embodiment of the present invention, but the present invention is not limited to the embodiment.

{Example 1}

Drainage asphalt mixed with 83% coarse aggregates with a maximum aggregate particle diameter of 12%, sand 12%, and fillers 5% with high viscosity modified asphalt 4.5% added with thermoplastic SBS elastomer as a main component 12% modifier in comparison to the amount of asphalt. The composition was prepared.

Basic property measurement and permeability test of the test piece prepared in the same manner as described above, which is shown in detail in Table 2 and Table 3 below.

{Example 2}

A drainage asphalt composition was prepared by mixing 5% of the high viscosity modified asphalt used in Example 1 with an aggregate formulation of 86% coarse aggregate with a maximum aggregate particle diameter of 13 mm, sand 9%, and 5% filler.

Basic property measurement and permeability test of the test piece prepared in the same manner as described above, which is shown in detail in Table 2 and Table 3 below.

{Example 3}

A drainage asphalt composition was prepared by mixing a high viscosity modified asphalt 5.5% used in Example 1 with an aggregate formulation of 88% coarse aggregate, 7% sand, and 5% filler material having a maximum aggregate particle size.

Basic property measurement and permeability test of the test piece prepared in the same manner as described above, which is shown in detail in Table 2 and Table 3 below.

{Example 4}

A granularity mixture was prepared by mixing 44% coarse aggregate with a maximum aggregate particle diameter of 44 mm, 44% with 8 mm coarse aggregate, 9% with sand, and 3% with aggregate.

Basic property measurement and permeability test of the test piece prepared in the same manner as described above, which is shown in detail in Table 2 and Table 3 below.

Table 2 Basic Properties of Drainable Asphalt Compositions

Test Items Example 1 Example 2 Example 3 Example 4 Theoretical density (g / cm3) 2.537 2.557 2.577 2.468 Marshall test Density (g / cm 3) 2.034 2.030 2.041 2.363 Porosity (%) 21.4 19.9 21.3 4.1 Stability (KN) 3.96 5.21 4.56 9.26 Flow value (1 / 10mm) 27.0 32.7 30.7 34.0 Cantabros Loss Rate (%) 10.2 13.3 17.9 16.8 Wheel tracking Specimen density (g / cm 3) 2.038 2.021 2.038 2.033 Net high density (%) 100.2 100.4 99.9 86.0 Consolidation strain (mm) 0.4600 0.0093 0.5000 1.0400 Final deformation (mm) 1.00 0.98 1.02 2.12 Dynamic Stability (times / mm) 4500 4500 4500 2500

Permeability Test of Drainable Asphalt Composition

No. Test Items unit Example 1 Example 2 Example 3 Example 4 One Specimen average thickness Cm 6.09 5.95 5.93 5.92 2 Specimen mean diameter Cm 9.98 9.98 9.98 9.98 3 Specimen average cross-sectional area ㎠ 78.2 78.2 78.2 78.2 4 Water height Cm 8.5 8.5 8.5 8.5 5 Measuring time sec 120 120 120 120 6 flow ㎠ 5305.7 5146.9 5466.3 0 7 Water temperature ℃ 7 7 7 7 8 Correction Factor for Water Temperature 1.248 1.248 1.248 1.248 9 1 ÷ 4 0.7165 0.7000 0.6976 0.6965 10 6 ÷ (3 × 5) 0.5339 0.5486 0.5826 0.5196 11 K = 9 × 10 Cm / sec 0.3825 0.3840 0.4065 0.3619 12 K15 = 8 × 11 Cm / sec 0.4774 0.4792 0.5073 0.4516 13 K15 average Cm / sec 0.4774 0.4792 0.5073 0.4516 14 Specimen porosity % 21.4 19.9 21.3 4.1 15 Specimen continuous porosity % 14.8 12.3 15.0 2.8

As described above, the present invention improves the drainage function during rainy weather, thereby reducing water disturbance caused by driving vehicles and reducing visual disturbances due to relieving spray, reducing water film phenomenon and slip resistance during high-speed driving during rainy weather, that is, reducing hydroplaning phenomenon. There is an advantage to this.

In addition, the present invention is to reduce the road reflection by the headlights at night and improve the recognition of the road marking line in the rain, and to reduce the road traffic noise (3 to 5 dB) due to the driving of the vehicle, and to improve the vehicle driving safety There is a synergistic effect that can be improved.

In particular, the present invention has the advantage that the physical properties such as fly ash resistance, weather resistance, water resistance, flow resistance and the like of the aggregate is better than the compactness mixture by mixing the modified high viscosity asphalt, it is possible to obtain a porosity of about 20 to 27%.

Claims (4)

In the manufacturing method of drainage asphalt, The main component is a thermoplastic styrene-butadiene-styrene copolymer having a weight average molecular weight in the range of 70,000 to 110,000 in comparison to the amount of asphalt of 4.5 to 5.5% in the aggregate formulation of 85 to 87% of aggregate, 8 to 10% of sand, and 4.5 to 5.5% of filler. A method for producing drainage asphalt, characterized by comprising a process for producing a high viscosity modified asphalt by adding a modifier of 11 to 13%. The method of claim 1, wherein the modified asphalt is manufactured so that the viscosity at 60 ° C is 200,000 poise or more. The method of claim 1 or 2, wherein the aggregate is a coarse aggregate having a maximum aggregate particle size of 10 to 15 mm. Drainage asphalt prepared from the composition of any one of claims 1 to 3.