JPH0633409A - Composition for resin mortar water permeable pavement - Google Patents

Abstract

PURPOSE:To improve the workability and strength by a method wherein sepiolite fibers the lengths of which are specified are added to a water permeable pavement material formed of a colored aggregate with a single grain size and cold- setting resin. CONSTITUTION:A water permeable pavement material with a high porosity formed of a colored aggregate with a single grain size, such as natural cobble stones, crushed stones or a colored porcelain aggregate, and cold thermosetting resin, such as epoxy resin, is prepared. Sepiolite fibers are added thereto, and even when temperature is changed owing to oil suction operation during construction and curing, the thickness of a resin film is kept at a constant value. This constitution stabilizes a strength without being influenced by a change in the outside air temperature, prevents the occurrence of separation through the increase of an interaggregate fastening force, prevents the change of an aggregate color tone, and improves the bending strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin mortar permeable pavement composition applied to park roads, sidewalks, roads and the like.

[0002]

2. Description of the Related Art Heretofore, as a composition for mortar water-permeable pavement of this type of resin, a single-grain aggregate such as natural stone boulders and a room temperature thermosetting resin such as a highly flexible modified epoxy resin (hereinafter referred to as a fastening material) ) Is used to mix these aggregates and fasteners,
It is used by being constructed on paved road surfaces such as park roads, sidewalks, and roadways. That is, the composition is applied on a water-permeable asphalt or cement concrete pavement or a water-impermeable asphalt or cement concrete pavement with a trowel or mechanically leveled to a certain thickness. As a characteristic of this composition, as shown in FIG. 1, since it is composed of a single-grain aggregate a and a fastening material b, a first continuous high porosity can be obtained. Therefore, the composition is applied on the pavement described above. Therefore, it has a function of transmitting or draining rainwater on the road surface under the pavement surface, and secondly, by using the colorless and transparent fastening material b, it is possible to obtain the color tone of the aggregate a. Therefore, the composition is widely used for improving the landscape of the pavement surface, lightening, and the like.

[0003]

By the way, in order to obtain a high porosity in the above-mentioned water-permeable pavement compositions generally used in the past, as shown in FIG. 2, the fastening material b is mixed with the aggregate c having different particle sizes. In addition, instead of using a dense composition having no voids, a composition which can form a large number of voids by adding a small amount of the fastening material b to the single-grain aggregate a as described above is adopted. However, when using a single-grain aggregate a,
Compared to the case of using aggregates c having different grain sizes, the effect of meshing between the aggregates is less, so the strength of the composition is greatly influenced by the bonding area between the aggregates a as well as the strength of the fastener b. become.

The adhesive area changes depending on the viscosity of the fastening material b. As shown in FIG. 3, if the viscosity of the fastening material b is high and the thickness of the fastening material b with respect to the aggregate a is large, the adhesion area is large. However, as shown in FIG. 4, when the viscosity of the fastening material b is low and the thickness of the fastening material b with respect to the aggregate a is small, the adhesion area is reduced, and therefore, In order to increase the thickness of the fastening material b, it is necessary to increase the addition amount of the fastening material b and increase the viscosity of the fastening material b.
Therefore, it is particularly important to control the viscosity of the fastening material b.

However, regarding this viscosity control, it is possible to obtain a uniform thickness of the fastening material b by controlling the temperature at the time of working with a heating composition like an asphalt composition, but mixing at room temperature With a resin mortar permeable composition that is applied at room temperature, the viscosity of the fastening material b is affected by the temperature and road surface temperature during construction, and the viscosity cannot be controlled, and a uniform thickness of the fastening material b cannot be obtained throughout the year. there were.
As a result, the strength of the resin mortar water-permeable composition thus applied varies depending on the temperature conditions at the time of application.

To cope with this variation in strength, a fine powder silicic acid thickener (colloidal silica) has been used to impart thixotropic viscosity to the fastening material to prevent sagging, and several types of fastening materials b having different viscosities are prepared. Although it has been dealt with to make the film thickness of the fastening material b constant with respect to the aggregate a by using the fastening material b having a viscosity adapted to each season, the finely divided silicic acid-based thickener delusters the luster of the fastening material b. Since it has a function, it can reduce the color tone of the aggregate a and cannot be used except in special cases, and even in the case of the fastener b whose viscosity is adjusted to adapt to each season, the temperature and the road surface during daytime and nighttime It cannot be handled in the season when the temperature difference is large, and inventory management becomes complicated, so
A resin mortar permeable pavement composition that solves these problems with a single fastening material b throughout the year is desired.

In the present invention, as a result of intensive research on this requirement, attention was paid to sepiolite fiber which is a natural fibrous clay mineral. That is, this sepiolite fiber is a kind of hydrous magnesium silicate, has a brick-laying structure, and is 5.6 ×
Since it has many tunnels with a long 11.0Å hole diameter, it is used as an absorptive filler. In addition, since it has a large number of bundle pores of 10 ² to 10 ³ Å generated by the entanglement of single fibers, this sepiolite fiber In Fig. 5, the oil absorption effect between the sepiolite fiber and the epoxy resin is inversely proportional to the viscosity, as shown in Fig. 5.
The point that the oil absorption rate increases with the decrease in viscosity of the epoxy resin whose viscosity decreases due to the increase in temperature, and further, since this sepiolite fiber has hydroxyl groups on the surface, it is well compatible with fastening materials such as epoxy resin and aggregates, In addition, it has characteristics such as good dispersion with respect to the fastening material.
The present invention pays attention to this characteristic, and by adding this sepiolite fiber to a water-permeable pavement material, even if the temperature during construction and curing changes due to its oil absorption effect, a fastening material with a constant film thickness is always formed on the aggregate surface. Can be ensured, the required strength of the resin mortar water-permeable composition can be stabilized, and an action of increasing the fastening force between the aggregates and preventing the aggregates from separating can also occur. It was found that the effect was exhibited even when the amount used was extremely small, and the color tone of the aggregate used did not change.

Therefore, in the present invention, by adding the sepiolite fiber having such an oil absorbing effect, stable physical properties are produced irrespective of the construction time and the presence or absence of sunlight, and the fastening force between aggregates is improved. Thus, it is an object of the present invention to provide a resin mortar water-permeable composition that does not change the color tone of the aggregate used.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, however, the present invention provides a single-grain colored aggregate such as natural stone boulders, crushed stone, or colored porcelain aggregate, and epoxy resin, urethane resin, acrylic resin, etc. It is a water-permeable pavement material made of a room temperature thermosetting resin, to which sepiolite fibers are added.

The sepiolite fiber preferably has a fiber length of less than 50 μm.

[0011]

With the above structure, a high porosity can be obtained by adding sepiolite fiber, which is a natural fibrous viscosity mineral, to a water-permeable pavement material composed of a single-grain colored aggregate such as natural stone cobblestone and the room temperature thermosetting resin. Even if the temperature during construction and curing changes due to the oil absorption effect of the sepiolite fiber while still being obtained, it is possible to always secure a fastening material with a constant film thickness on the aggregate surface, and as a result, the construction time and the presence or absence of sunshine It is possible to obtain the stabilization of the strength of the resin mortar water-permeable composition regardless of the outside air conditions, and to increase the fastening force between the aggregates to prevent the aggregates from coming off. The effect is exhibited even with a very small amount, and the color tone of the aggregate used is not changed.

Further, the sepiolite fiber having a fiber length of less than 50 μ has good dispersibility in the binder and can improve bending strength.
It should be noted that even with a fiber length of 50 μm or more, a constant film thickness can be obtained on the surface of the aggregate, the strength thereof can be stabilized, and the initial object of the present invention can be achieved. However, the fibers are locally concentrated, and conversely, the strain is reduced and the bending strength is also reduced. Further, the lower limit of the fiber length is not particularly limited, but when a powdery appearance is used, the dispersibility is good, and the bending strength of the composition can be improved, but the strain is reduced, so that it will be described later. Short fibrous and medium fibrous ones are preferred.

[0013]

EXAMPLES Examples will be described below. The room temperature thermosetting resins used in Examples 1 to 6 and Comparative Examples 1 to 3 described here were epoxy resins having the physical properties shown in Table 1. .

[0014]

[Table 1]

The sepiolite fibers used in Examples 1 to 6 and Comparative Examples 2 and 3 are long fibrous sepiolite fibers A having a fiber length of 50 μm or more and a fiber diameter of 0.2 μm shown in Table 2, and fibers. Medium fibrous sepiolite fibers B having a length of less than 50 μm and a fiber diameter of 0.2 μ, short fiber sepiolite fibers C having a fiber length of 5 μm and a fiber diameter of 0.2 μm, and a fiber length of 5
4 of fine pulverized sepiolite fiber D having a fiber diameter of 0.1 μ
Table 2 shows the oil absorption rate of each of these sepiolite fibers A to D according to the oil absorption rate measurement method shown in JIS K-5101. In addition, the specimen used in the experiment was molded using the bending test mold shown in JIS R-5201, and Example 1 using sepiolite fiber was used.
For # 6, the dispersibility was observed, and after curing for 7 days, a bending test was performed, and the bending strength was measured according to the same method. The preparation, curing, and test temperatures of the specimen are 20 ° C.

[0016]

[Table 2]

Example 1 0.5 part of medium fibrous sepiolite fiber B having a fiber length of less than 50 μm and a fiber diameter of 0.2 μm was added to a water-permeable pavement material composed of 94 parts of single-grain gravel and 6 parts of epoxy resin. did.

Example 2 One part of medium fibrous sepiolite fiber B having a fiber length of less than 50 μm and a fiber diameter of 0.2 μm was added to a water-permeable pavement material consisting of 94 parts of single-grain gravel and 6 parts of epoxy resin.

Example 3 0.5 part of short fibrous sepiolite fiber C having a fiber length of 5 μ and a fiber diameter of 0.2 μ was added to a water-permeable pavement material consisting of 94 parts of single-grain gravel and 6 parts of epoxy resin. .

Example 4 One part of short fibrous sepiolite fiber C having a fiber length of 5 μ and a fiber diameter of 0.2 μ was added to a water-permeable pavement material consisting of 94 parts of single-grain gravel and 6 parts of epoxy resin.

Example 5 0.5 part of fine powder sepiolite fiber D having a fiber length of 5 μ and a fiber diameter of 0.1 μ was added to a water-permeable pavement material consisting of 94 parts of single-grain gravel and 6 parts of epoxy resin.

Example 6 One part of a fine powder sepiolite fiber D having a fiber length of 5 μ and a fiber diameter of 0.1 μ was added to a water-permeable pavement material consisting of 94 parts of single-grain gravel and 6 parts of epoxy resin.

When the properties of each of the above examples were measured, the results shown in Table 3 were obtained. In Table 3, Comparative Examples 1 to 3 are Comparative Examples prepared for comparison with Examples 1 to 6, and among these Comparative Examples, Comparative Example 1 is an example in which sepiolite fiber is not added. No. 2 was obtained by adding 0.5 part of long fibrous sepiolite fiber A having a fiber length of 50 μ or more and a fiber diameter of 0.2 μ, and Comparative Example 3
Is the one in which 1 part of the long fibrous sepiolite fiber A having a fiber length of 50 μm or more and a fiber diameter of 0.2 μm is added.

[0024]

[Table 3]

From the results shown in Table 3, in Examples 1 and 2 using the medium fibrous sepiolite fiber B and Examples 3 and 4 using the short fibrous sepiolite fiber C, the dispersibility in the composition was good and Comparative Example Compared with the composition shown in No. 1 in which the sepiolite fiber is not added, the bending strength is increased and the fastening force between the aggregates is increased. On the other hand, Comparative Examples 2 and 3
As can be seen in Figure 5, the fiber length is 50μ or more and the fiber diameter is 0.2.
When the long fiber sepiolite fiber A of μ was used, the dispersibility in the composition was poor as compared with Examples 1 to 4, the fibers were locally concentrated, and therefore the bending strength and strain were reduced. . On the other hand, the fiber length is less than 50 μm and the fiber diameter is 0.
2μ medium fibrous or short fibrous sepiolite fibers B, C
Examples 1 to 4 in which the bending strength is increased as compared with Comparative Example 1 as well as Comparative Examples 2 and 3 are small in distortion reduction and increase the fastening force between aggregates. It can be found to obtain a composition capable of When a finely powdered product is used, the dispersibility is good and the bending strength of the composition can be improved, but since the strain is slightly reduced, short fiber and medium fiber products are preferred.

Table 4 shows the results of a bending test conducted by changing the amount of the epoxy resin added to the composition of Example 1 to 6 parts, 7 parts and 8 parts. However, the preparation of the specimen and the curing temperature were performed at 20 ° C. In addition, as comparative examples, those in which the addition amount of the epoxy resin in the composition of Comparative Example 1 in which the sepiolite fiber was not added was changed to 6, 7, and 8 parts were also listed.

[0027]

[Table 4]

According to the results shown in Table 4, when the amount of the fastening material added was changed in the example 1 in which the sepiolite fiber was added, the bending strength was increased and the strain was reduced as compared with the example 1. Since there is almost no change in bending strength and strain and many aggregates are destroyed in the state of the fracture cross section, it can be seen that strong fastening is performed even with a small amount of fastening material. On the other hand, in Comparative Example 1, when the addition amount of the fastening material was changed, the increase in the addition amount, that is, the increase in the bonding area between the aggregates, the increase in the strength and the decrease in the strain were found. Further, since the fracture rate of the aggregate increases in the state of the fracture cross section, it can be judged that the fastening force exceeds the strength of the aggregate by increasing the amount of the fastener. Therefore, it is revealed that, in order to generate the same fastening force, the composition of Example 1 can be produced in a smaller amount than the amount of the fastening material to which the sepiolite fiber is not added.

Further, Table 5 shows the composition of Example 1 using the medium fibrous sepiolite fiber B having a fiber length of less than 50 μm and a fiber diameter of 0.2 μm, and the curing temperature is 10, 20, 3
The change in bending strength was measured by changing the temperature to 0, 40, and 50 ° C., and the state of the sagging of the fastening material was observed. As a comparative example, a comparative example 1 in which no sepiolite fiber was added
Of the composition and curing temperature of 10, 20, 30, 4
The change in bending strength and the state of the sagging of the fastening material when changed to 0 and 50 ° C are also listed.

[0030]

[Table 5]

From the results shown in Table 5, in the case of Example 1 to which the sepiolite fiber B was added, there was almost no change in the bending strength and strain even when the production and curing temperature of the sample was changed, and the fastening material was used. No sagging was observed, but in Comparative Example 1 in which the sepiolite fiber was not added, the flexural strength and strain values changed due to changes in composition preparation and curing temperatures, and as the temperature increased, The sagging of the fastening material is also significant, that is, it is not possible to always secure a fastening material having a constant film thickness on the aggregate surface, and the values of bending strength and strain are reduced.

[0032]

As described above, according to the present invention, a single-grain colored aggregate such as natural stone boulders, crushed stone, or colored porcelain aggregate and normal temperature thermosetting resin such as epoxy resin, urethane resin or acrylic resin are used. Since it is made by adding sepiolite fiber which is a natural fibrous viscosity mineral to the water-permeable pavement material,
Even if the temperature during construction and curing changes due to the oil absorption effect of sepiolite fibers while maintaining a high porosity, it is possible to always secure a fastening material with a constant film thickness on the aggregate surface. It is possible to obtain the stabilization of the strength of the resin mortar water-permeable composition irrespective of the outside air conditions such as the presence or absence of, and also the effect of increasing the fastening force between the aggregates and preventing the aggregates from separating, Moreover, the effect is exhibited even when the amount used is extremely small, and the color tone of the used aggregate is not changed.

When the sepiolite fiber has a fiber length of less than 50 μm, the dispersibility in the binder is improved and the bending strength can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a resin mortar water-permeable pavement composition comprising a single-grain aggregate and a fastening material.

FIG. 2 is an explanatory view of a resin mortar water-permeable pavement composition composed of an aggregate having different particle sizes and a fastening material.

FIG. 3 is an explanatory diagram showing an adhesion area in the case where the thickness of the fastening material with respect to the aggregate is large.

FIG. 4 is an explanatory diagram showing an adhesion area in the case where the thickness of the fastening material with respect to the aggregate is thin.

FIG. 5 is a characteristic diagram showing a correlation between oil absorption and viscosity of sepiolite fiber with respect to an epoxy resin.

Claims (2)

[Claims] 1. A sepiolite fiber is added to a water-permeable pavement material composed of a colored aggregate having a single particle size such as natural stone boulders, crushed stone, or colored porcelain aggregate and a room temperature thermosetting resin such as epoxy resin, urethane resin, or acrylic resin. A resin mortar water-permeable pavement composition characterized by the above. 2. The resin mortar water-permeable pavement composition according to claim 1, wherein the fiber length of the sepiolite fibers is less than 50 μm.