JPS5821449A - Colored asphalt mixture - Google Patents

Abstract

PURPOSE:A mixture having stable strength, improved high-temperature properties and brittleness resistance at low temperature free from reduction in strength by water immersion, obained by dispersing red mud into hot asphalt by a flashing method consisting of a fatty oil and an alkylamide, followed by blending the dispersion with sand and crushed stone. CONSTITUTION:Red mud is dispersed into hot asphalt by a flashing method consisting of a fatty oil and an alkylamide to give a dispersion, which is blended with sand and crushed stone. The alkylamide has preferably a boiling point of 120-220 deg.C(3mm.Hg), a freezing point of -8-16 deg.C, a specific gravity of 0.87- 0.88(25 deg.C), a viscosity of 13-19(25 deg.C, cps), and water-solubility of 8-38 (25 deg.C, g in 100g).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the invention by adding sand or sand and crushed stone to a colored asphalt mixture, more specifically an As7alsi composition in which red mud is dispersed in heated asphalt using a flushing method comprising fatty oil and an alkylamide. Red mud, which relates to mixed colored asphalt mixtures, is a reddish-brown muddy extraction residue produced in large quantities when alumina is extracted by treating Bauxai F with an alkaline solution in the aluminum industry, and its constituent components are listed below. As shown in I.

Table ■ (Example of analysis of red mud constituents) By the way, in addition to the alkali-insoluble iron oxide, quartz, etc. present in bauxite, red mud also contains alkali-ready silica dissolved into the solution during alumina extraction. The main component is fine precipitates of sodium aluminum silicate, which is precipitated by fusion with alumina and sodium in the liquid, and it has a moisture content of 200 to 300 degrees, so it is used as a coloring material for asphalt. If it is used, a large amount of moisture must be removed, and its properties are poor in peeling resistance, and strength decreases due to water immersion, and this tendency becomes more pronounced over time. Its side cannot be used. Therefore, as a means of using this red mud as a coloring material for asphalt, it is necessary to
Either by firing it at a high temperature and mechanically refining it, or by
Although it is conceivable to use it as an aqueous emulsion, the present invention was invented in view of this point. Therefore, the purpose of the present invention is to provide a colored asphalt mixture that effectively utilizes red mud. In order to achieve this, the present invention creates a colored asphalt mixture by blending sand or sand and crushed stone into an asphalt composition in which red mud is dispersed in heated asphalt using a brushing method using fatty oil and an alkylamide. .

As mentioned above, the present invention uses red mud as a coloring material for heated asphalt, so the red mud containing a large amount of water is weakened by a hydrophilic activating agent to weaken the cohesive force, widen the interparticle gaps, and allow oils to penetrate. This made it possible to separate water droplets and make it hydrophilic so that it could be easily dispersed in heated asphalt. That is, the alkylamide used for 7 lashing of red mud is a saturated fat (R is an alkyl group, 2 is a methyl group or an ethyl group).
Indicated by

This thing has the following properties.

1. Soluble: Well soluble in hydrocarbons, plasticizers, fatty acids, animal and vegetable oils, and esters, and also soluble in water.

It has electron-donating properties because it has a 2-electron-donating carbonyl group, and shows affinity with electron acceptors such as alcohols, phenols, acids, and other water ion donors, and forms a complex with red mud. Possible 3a Thermal stability: Stable at high temperatures and prevents deterioration of oils due to heating during evaporation of water in red mud.

4. Chemical stability and physical properties Red mud does not undergo hydrolysis due to the water it contains, and is stable in an alkali solution of sodium silica aluminum. It also improves mechanical dispersibility during kneading, etc.

Because of these characteristics, red mud could be dispersed in heated asphalt as described above.

Therefore, the property range of the alkylamide compound that is effective in the present invention is as shown in Table (2).

In addition, the alkylamide compound reduces the oil absorption of fatty oil, which is an auxiliary agent used for dispersion, and causes water to migrate as water droplets in several songs. This is mixed with heated and melted asphalt (7Al) with stirring, and various adjustments are made depending on the preparation and coloring properties to obtain a colored asphalt composition,
This is a colored asphalt mixture made by blending sand or sand with crushed stone.

Next, the method for producing the colored asphalt mixture of the present invention will be explained based on the illustrated chart 70.

Fatty oil, fatty oil residue, petroleum heavy oil, tar mixture (C
).

Red mud (D) and mixture (C) in a ratio of 90-60:10-40
Weigh out the parts by weight, mix and stir while heating at 100°C for 1 hour, and then knead the red mud particles with a roll mill or ball mill. During this kneading, the temperature is gradually raised to 110 to 150°C to evaporate the water that has migrated to the mixed oil, producing a reddish-brown slurry (E).

Next, asphalt C heated and melted at 150 to 160°C
F) Add 5 to 35 parts of the slurry (IE) to 95 to 35 parts.
Add within 65 parts and mix well and stir until uniform to form a colored asphalt composition (G). Add the required amount of sand or sand and crushed stone to this composition (G) and color it. It was made into an asphalt mixture.

Next, one embodiment of the present invention will be described.

5 parts of fatty acid distillation residue 15Z (same parts by weight below) and 7.5 parts of unsaturated fatty acid demethylamine were mixed, 165 parts of this mixture was mixed with 318 parts of red mud, and mixed and stirred while heating at 100 ° C. , the red mud particles were crushed in a roll.

During this kneading, the temperature was gradually raised to 130° C. to evaporate the moisture transferred to the distillation residue of the fatty acid. 85 parts of asphalt with a penetration of 100 (25°C) heated and melted at 150°C was blended with 15 parts of the reddish brown slurry obtained in this way,
Mix and stir well to obtain a colored asphalt composition, and add 28 parts of crushed stone No. 7 and 66 parts of sand to 9 parts of this colored asphalt composition.
of the asphalt and stirred for ms to obtain a colored asphalt mixture. (Example 1) Also, the reddish brown asphalt composition 6.5
21.5 parts of crushed stone No. 6, 35 parts of crushed stone No. 7, and 67 parts of sand were blended into the mixture to obtain a colored asphalt mixture. (Example 2) Next, Table I shows examples of the properties of asphalt (penetration 25°C 40-200) and two types of reddish-brown slurry for asphalt (with different mixing ratios of l), a total of six types.
Shown as

However, the above (M) is a mixture of As7Al) (F) 10011 and 4 parts of a reddish brown slurry (z), and the above (B)
) indicates a mixture of 85 parts of As7al) (F) and 15 parts of a reddish-brown slurry (IE), in other words, the product obtained in the above example.

In addition, the colorability of asphalt (ν) is better as the amount of reddish-brown slurry (IL) increases;
95 parts of Al) (F) and 5 parts of reddish-brown slurry (IC) exhibited a chocolate color close to blackish brown;
CF) 35 parts and reddish brown slurry (1) 65 parts have a certain brightness.

Next, the mixing ratio and coloring properties of asphalt (F) and reddish-brown slurry (rich) are shown in Table 2.

Next, examples of the properties of the colored asphalt mixtures obtained in Examples 1 and 2 are shown in Table 2.

m) can be used as a filler for asphalt like limestone, igneous rock, slaked lime, etc.

Since the colored asphalt mixture of the present invention is constructed as described above, it exhibits a reddish-brown color, has stable strength, and has no decrease in water immersion strength.
However, it has the remarkable effect of having good high-temperature properties and low-temperature brittleness.

[Brief explanation of the drawing]

The drawing is a flowchart showing the method for manufacturing the product of the present invention. (M)...Mixed oil (B)...Alkylamide CC)...Mixture (D) -...Red mud (E)...Reddish brown slurry CF) -...Asphalt (G)・・Colored asphalt composition

Claims (1)

[Claims] A colored asphalt mixture characterized by blending sand or sand and crushed stone with an As7alsi composition in which red mud is dispersed in heated asphalt using a flushing method using fatty oil and an alkylamide.