JPH0699418A - Molding method for recurrent reflective material for pavement - Google Patents

Abstract

PURPOSE:To retain the recurrent reflecting properties for a period of long time by scattering aggregates composed of a mixture of recurrent reflective glass beads, cement and the like mixed with synthetic resin emulsion for mixing cement over a non-slump mortar layer, pressurizing and integrating. CONSTITUTION:As a mixed material, a mixed aggregate composed of natural stones, ceramic color rubbles and recurrent reflective beads making 90-75wt.% and cement of 10-25wt.% to which synthetic resin emulsion for mixing cement having the viscosity of 500-100CP at 20 deg.C of 10-5wt.% is preferably used. Non- slump mortar is fed into a mold and pressure molded. The mixed material is scattered over the layer and pressurized to mold a recurrent reflective emulsion mortar layer, and cemented with the non-slump mortar layer integrally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a retroreflective pavement material suitable for use in road stop lines and the like.

[0002]

2. Description of the Related Art As is well known in the art, lane marks such as painted white lines and yellow lines are generally used in roadways as road stop lines, pedestrian crossings, and character displays. Conventionally, these lane marks have to be paved on the road with asphalt, concrete, interlocking, concrete slabs, etc., and then apply the paint to the paved surface, such as car stop lines, pedestrian crossings, character display, division pairs etc. It was generally formed by.

[0003]

However, since the white line and the yellow line of the lane mark made of the above-mentioned paint are formed by applying the paint, the thickness is thin, and they are worn on a short-term day at a frequent intersection at traffic. There was a problem that I had to constantly repaint. For this reason, it is necessary to carry out construction with all traffic closed,
There was a problem that it was expensive.

Further, the white line and the yellow line of the lane mark made by the conventional paint do not have the effect of retroreflection for returning incident light to the light source direction because water accumulates and is irregularly reflected when it rains.
There was also a problem of easy dirt. Further, when the pavement is asphalt, the asphalt contracts due to the difference in temperature and temperature, which causes a problem that a crack is formed on the lane mark line.

The object of the present invention is to solve the above problems,
An object of the present invention is to provide a method for molding a retroreflective pavement material which can maintain retroreflectivity semipermanently only by being buried in a road and does not require repair such as repainting.

[0006]

A method of molding a retroreflective pavement material according to the present invention is a method in which a synthetic resin emulsion for cement admixture is added to an aggregate mixed with natural stone, crushed ceramic color stone, retroreflective glass beads, cement and the like. It is characterized in that the mixed material added and mixed is sprinkled on the upper surface or the lower surface of the North lamp mortar layer, pressure-molded, and then integrally molded by immediate release.

[0007]

In the above-mentioned structure, a mixture prepared by previously adding a mixture of a synthetic resin emulsion for cement admixture as a binder to an aggregate containing retroreflective glass beads in addition to natural stone and the like is previously formed. Since it is provided on one surface of the lamp mortar layer and is integrally molded by immediate release, it is possible to obtain a block-shaped paving material with glass beads having retroreflective properties exposed on one surface. It is possible to achieve semi-permanent retroreflectivity by burying the as the surface in the road.

In the present invention, in order to expose the retroreactive glass beads to the surface of the paving material, the total amount of the mixed material is 90 to 75% by weight of natural stone, ceramic color crushed stone, and retroreflective glass beads. , 25 to 10% by weight
Of 10 to 5% by weight with respect to the mixed aggregate of the cement and the mixed aggregate, and the viscosity is 5 at 20 ° C.
It is preferable to use an emulsion composed of a cement-mixing synthetic resin emulsion having a viscosity of 100 to 100 cP.

[0009] For the same reason, aggregates of natural stone and ceramic color crushed stone having a grain size of 6 to 4 mm are 15% in total, and aggregates of natural stone and ceramic color crushed stone having a grain size of 2 to 1 mm are total. 20%, and total retroreflective beads with a particle size of 1 to 0.5 mm are 60
%, A total of 5% of other inorganic pigments and a binder, and 20% of cement with respect to 100% of these totals are preferably used.

[0010]

EXAMPLE FIG. 1 is a flow chart for explaining an example of a method for molding a retroreflective pavement material according to the present invention. Figure 1
According to the present invention, first, the north lamp mortar is put in a predetermined mold and molded by the molding pressure. In this case, if a hydraulic press is used, it is 800 to 1000.
Pressures in the kg / cm ² range are desirable. Of course, a pneumatic press can be used while applying vibration, and in this case, a pressure in the range of 0.3 to 1.0 kg / cm ² is desirable. When molded in this way, a north lamp mortar layer having a predetermined thickness is formed.

Next, 90 to 75% by weight of natural stones in total,
Ceramic color crushed stone, retro-reflective glass beads and 2
Mix aggregate with 5-10 wt% cement and 10-5 wt% with respect to the mix aggregate, with a viscosity of 2
A mixing material prepared by mixing with a cement-mixing synthetic resin emulsion which is 500 to 100 cP at 0 ° C is prepared. Next, the prepared mixed material is sprinkled on the upper surface or the lower surface of the Northland mortar layer previously formed, and molding is performed with the molding pressure. In this case as well, if a hydraulic press is used,
A pressure in the range of 0 to 1000 kg / cm ² is desirable,
When using a pneumatic press while giving vibration, 0.
Pressures in the range of ^{3 to} 1.0 kg / cm ² are desirable.

In this way, the mixture is molded as an emulsion mortar layer, and the retroreflective emulsion mortar layer is integrally attached to the north lamp mortar layer by the action of the cement-mixing synthetic resin emulsion. Then, if this is immediately released from the mold, the retroreflective pavement material of the present invention in which the retroreflective glass beads are exposed on the surface can be obtained.

Any of natural stone, ceramic color crushed stone, and retroreflective glass beads constituting the mixed material may be used in a total amount of 90 to 75% by weight, preferably 8
5% by weight is preferable, and the cement content is 25 to 10
Any weight range may be used, but 20 weight% is preferred. Then, the synthetic resin emulsion for cement admixture constituting the admixture is in the range of 10 to 5% by weight with respect to the mixed aggregate consisting of natural stone, crushed ceramic color stone, retroreflective glass beads and cement, and 10% by weight. If the content exceeds 5%, the resin tends to become sticky, making it difficult to carry out the connection molding, and if it is less than 5% by weight, it becomes an uncured state, the hardness decreases, and the abrasion resistance,
It has been confirmed that it is inferior in terms of water resistance. Furthermore, the viscosity of the above-mentioned cement admixture may be in the range of 500 to 100 cP at 20 ° C., preferably 200 cP. If it exceeds 500 cP, the viscosity becomes high and molding becomes difficult.

Any kind of natural stone, ceramic color crushed stone, and other materials such as ceramics, rocks, and ores may be used as a material for the mixed aggregate, but when coloring, ceramic color crushed stones and pieces of ceramics are used. ,marble,
It is desirable to use granite or crushed stone. Further, as the above-mentioned cement-mixing synthetic resin emulsion, a styrene-butadiene rubber type, a vinyl acetate type or the like can be used, but an acrylic type copolymer resin emulsion is preferable.

The retroreflective glass beads that compose the mixed aggregate are spherical and have, for example, a specific gravity as their properties:
2.5, refractive index: 1.52, softening temperature: 730 ° C., Mohs hardness: 6.5, preferably 1.0 to 0.5 m
Use a particle size of m. The hue is preferably white or yellow because it is used for the white line and the yellow line of the lane mark. Further, as described above, since the retroreflective glass beads are exposed on the surface of the pavement material as the final product and the bead space is filled with various ceramic aggregates, the effect is particularly great at night and in the rain. In addition to exhibiting retroreflectivity, it is possible to prevent abrasion of the beads, prevent the beads from falling off the surface, and make the surface layer water-permeable.

A specific example of the molding method of the present invention will be described below. First, a north lamp mortar layer was formed by putting north lamp mortar in a mold and applying a pressure of 300 kg / cm ² using a hydraulic press. Next, a mixed material having the following composition was sprayed on the north lamp mortar layer. As a mixing material, a total of 35% by weight of natural stone and ceramic color crushed stone, 60% by weight of retroreflective glass beads, a total of 5% by weight of an inorganic pigment, methylcellulose and a thickener, and 20% by weight based on a mixture thereof. Mix aggregate consisting of white cement and this mix aggregate 10
A synthetic resin emulsion for cement admixture consisting of 7% by weight of an acrylic copolymer resin emulsion having a viscosity of 200 cP with respect to 0% by weight was used.

The particle size distribution of the mixed aggregate used
Is a natural stone or ceramic color with a particle size of 6-4 mm
15% by weight of aggregate and a natural stone with a particle size of 2-1 mm
20% by weight of ceramic color aggregate and 1 to 0.5 m
60% by weight of retroreflective glass beads having a particle size of 0.
5% by weight of pigments and thickeners with a particle size of 5 to 0.1 mm
there were. Use the resulting mixed material with a hydraulic press as above.
1000 kg / cm ² Pressurize at
Molding a lujon mortar layer
It is integrally joined on the upper layer.

According to the paving material of the present invention obtained according to the above-mentioned manufacturing method, a retroreflective glass bead layer having a thickness of 6 to 8 mm is formed on the surface layer, and since the surface layer has water permeability, even if it rains. It was confirmed that the efficiency of retroreflection was good, the retroreflectivity could be maintained for a long period of time, and that stains did not adhere. Also, since only one liquid of the synthetic resin emulsion for cement admixture is mixed as the binder, it does not take time to obtain the mixture, and when it is integrally molded with Northramp mortar, it is integrally molded with Northramp mortar. There was no problem with it, and the manufacturing work was easy.

[0019]

As is apparent from the above description, according to the present invention, since the retroreflective glass bead layer can be formed on the surface layer, the retroreflectivity can be maintained for a long time, and the surface layer is water-permeable. Since the water has no effect even if it rains and the retroreflective effect is great, it is possible to obtain a paving material suitable as a road lane mark or the like.

[Brief description of drawings]

FIG. 1 is a flow chart for explaining an example of a method for molding a retroreflective pavement material of the present invention.

Claims (3)

[Claims] 1. An aggregate obtained by mixing natural stone, crushed ceramic color stone, retroreflective glass beads, cement, etc.,
Molding of a retroreflective paving material characterized by spraying a mixed material mixed with a synthetic resin emulsion for cement admixture on the upper or lower surface of the north lamp mortar layer, press-molding it, and then integrally molding it with immediate release. Method. 2. The total content of the mixed material is 90 to 75% by weight.
Natural stone, crushed ceramic color stone, retroreflective glass beads and 25 to 10% by weight of cement, and 10 to 5% by weight based on the mixed aggregate, and the viscosity is 500 at 20 ° C. A synthetic resin emulsion for cement admixture having a viscosity of about 100 cP.
A method for molding the retroreflective paving material described. 3. The aggregate comprises 15% in total of natural stone and crushed ceramic color crushed stone having a particle size of 6 to 4 mm,
Similarly, the particle size of natural stone and crushed ceramic color stone is 2
20% in total for 1 mm, 60% in total for retroreflective beads having a particle size of 1 to 0.5 mm, 5% in total for other inorganic pigments and binders, and a total of 10% of these.
The method of molding a retroreflective paving material according to claim 1 or 2, which comprises 0% to 20% cement.