JPH0593405A - Cold type paving method using pumice and pumiceous sand (shirasu) - Google Patents

Abstract

PURPOSE:To form an excellent surface layer having durability and to make it possible to maintain a natural view by paving admixture mixing liquid synthetic resin with pumice and shirasu on the foundation, and leveling it. CONSTITUTION:Admixture mixing liquid synthetic resin such as epoxy resin or single liquid urethane resin, etc., with pumice and shirasu yielded as shirasu sandy soil is compounded. Then, after a sand-layer 2 is laid on a road surface 1, crusher run is spread and leveled and is rolled with a roller to construct a crusher run layer 3, and a subbase course is formed. After that, a water permeable heat asphalt mixing spinning substance is spread and leveled thereon and is rolled with the roller to construct a water permeable asphalt concrete layer 4 as the foundation. An admixture layer 5 consisting of pumice and shirasu is formed as a surface layer thereon. According to the constitution, brittleness in pumice and shirasu can be greatly improved.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is to construct a pavement surface layer using pumice and shirasu contained in shirasu produced as volcanic ash sandy soil, and to develop the natural texture of pumice and shirasu that have particle size permeability. The present invention relates to a room-temperature pavement construction method for constructing a natural-colored pavement that also has a water permeability that does not destroy the natural landscape such as a walkway, a promenade, or a park.

[0002]

BACKGROUND ART Pumice stone is contained in shirasu. Shirasu is mainly distributed in southern Kyushu and is distributed throughout Hokkaido and Tohoku. Especially, it is a volcanic ash sandy soil widely distributed from Kagoshima prefecture to Miyazaki prefecture, and occupies about 50% of the area in Kagoshima prefecture. The shirasu was easily eroded by water, and it was regarded as troublesome because damage was caused by the collapse of slopes and the like every heavy rain.
Therefore, various attempts have been made so far to effectively use this inexhaustible Shirasu for industrial purposes.
In terms of pavement, shirasu has been used as a roadbed and a lower roadbed, and as a roadbed after cement stabilization treatment of shirasu, because shirasu has a relatively large bearing capacity. However, shirasu has a property that it is easily crushed because the particles are porous and has not been used as a surface layer of pavement.

[0003] On the other hand, pumice stone has been conventionally used mainly as a culture soil for horticulture or as a drainage layer material such as a ground. Pumice stone is porous and easily crushed like shirasu, so that it is used for pavement. Is not used. Therefore, there is a demand for a room temperature pavement method using pumice and shirasu for the surface layer of an excellent pavement without crushing.

[0004]

The object of the present invention is to meet such a demand, and in order to significantly improve the durability of pumice and shirasu, liquid synthetic resin is mixed with pumice and shirasu. And then solidified, using pumice and shirasu as the surface layer of pavement, compressing pumice and shirasu pavement,
Natural landscapes such as sidewalks, promenades, parks, etc. that significantly improve bending, bending and abrasion resistance, eliminate the brittleness of pumice and shirasu, and make use of the natural texture of pumice and shirasu that have particle size permeability It is intended to provide a room temperature pavement method using pumice and shirasu for constructing a natural color pavement that also has a water permeability that does not destroy the concrete.

That is, the gist of the present invention is a room temperature pavement method using pumice and shirasu, which is characterized in that a pumice stone and a mixture of shirasu and a liquid synthetic resin are paved and shaped. To do.

According to the room temperature pavement method using pumice and shirasu according to the present invention, since the composite material can be mixed at room temperature, there is no need to control the temperature of the composite material. Since the material is a mixture of liquid synthetic resin in pumice and shirasu, the liquid synthetic resin binds the particles of pumice and shirasu, and the synthetic resin is impregnated and permeated into the porous parts of the pumice and shirasu particles. The pumice and shirasu can now be used as the surface layer of a pavement having excellent durability. At the same time, it is possible to construct a natural color pavement that is water-permeable and does not destroy the natural landscape such as sidewalks, promenades, parks, etc. that take advantage of the natural texture of pumice and shirasu that have particle size water permeability.

The room temperature pavement method using pumice and shirasu of the present invention will be specifically described below.

The base in the present invention is a roadbed made of water-permeable asphalt concrete, cement concrete or crushed stone.

The constituent materials of the composite material used in the room temperature pavement method of the present invention are pumice, shirasu and liquid synthetic resin.

Pumice stone is a composition contained in a large amount in shirasu.

Shirasu is a magma that was active as a submarine volcano in the Tertiary era, and melted a large amount of pumice by melting the granitic basement widely distributed underground at the end of the Quaternary Glacial Age (Pleistocene). It is a volcanic ash sandy soil that was ejected together with the gas. Volcanic glass occupies most of its mineral composition,
In addition, it contains plagioclase and perishite. Table 1 shows the general properties of shirasu.

[0012]

[Table 1]

The liquid synthetic resin is, for example, an epoxy resin, a one-component urethane resin or the like.

The epoxy resin in the present invention is a liquid resin containing a compound having one or more epoxy groups in one molecule as a main component. As the epoxy resin, there is generally a liquid resin which is a condensate of bisphenol A and epichlorohydrin (containing glycidyl ether of bisphenol A as a main component). In addition, glycidyl ether of bisphenol F, dimer acid glycidyl ether, polyalkylene glycol glycidyl ether,
Examples include glycidyl ether of bisphenol A alkylene oxide adduct, aliphatic glycidyl ether, urethane-modified bisphenol glycidyl ether, aliphatic aromatic co-condensed glycidyl ether, vinylcyclohexane dioxide, dicyclopentadiene oxide, hydrogenated bisphenol glycidyl ether, and the like.

These epoxy resins may be used either individually or in combination of two or more. In addition, as a diluent, for example, higher alcohols, plasticizers (eg, phthalic acid esters, fatty acid esters), phenols, alkylphenols, salicylic acid, alkyldiphenyls, phosphoric acid esters (eg, triesters) may be used as necessary. Phenyl phosphate), castor oil, pine oil, furfuryl alcohol and the like can also be appropriately used.

The curing agent is mainly composed of a compound having a functional group which reacts with an epoxy group in one molecule. Specifically, a generally known one is used. For example, aliphatic polyamine, aromatic polyamine, cycloaliphatic polyamine,
They are aliphatic hydroxypolyamines, modified polyamines thereof, amine adducts thereof, polyamides, keteimine, tertiary amines, imidazoles, BF ₃ amine complexes, acid anhydrides, dimer acids, trimer acids, liquid polysulfide rubbers and the like.

The quantitative ratio of the epoxy resin and the curing agent used in the present invention may be in a relatively wide range centered on the equivalent value which is the basis of the binding reaction between them, but the ratio should be close to the equivalent value. Is desirable.

The one-pack type urethane resin in the present invention is composed mainly of, for example, polyether polyols, polyester polyols and polyisocyanates, the molecular end of which is 1 to 15% by weight of an isocyanate group.
It is preferably a urethane prepolymer having 2 to 12% by weight. Further, as the diluent, one or more solvents such as toluene, xylene, methyl ethyl ketone, and ethyl acetate may be used. The solid content of the urethane resin in the urethane prepolymer is preferably 70% by weight or more.

As the polyether polyols, the polyether polyols conventionally used in the production of polyurethane foams can be used. For example, propylene glycol, glycerin, trimethylolpropane, other polyols and polyamines, and propylene oxide (P
O), ethylene oxide (EO), butylene oxide, methyltrimethylene oxide, dimethyltrimethylene oxide and the like are added.

Examples of the polyester polyols include dicarboxylic acids such as adipic acid, phthalic acid, dimerized linoleic acid and maleic acid, and ethylene, propylene,
Butylene, glycol such as diethylene, glycerin,
Examples include trimethylolpropane, diols such as pentaerythritol, triols, polyols obtained by reacting with polyols, and castor oil. Preferably, a liquid at normal temperature can be used.

As the polyisocyanates, polyisocyanates used in the production of polyurethane foam can be used. For example, tolylene diisocyanate (TD)
I), diphenylmethane diisocyanate (MDI),
Crude MDI, hexamethylene diisocyanate (HMD
I), xylylene diisocyanate (XDI), hydrogenated TDI, hydrogenated MDI, metaxylylene diisocyanate, polymethylene polyphenyl isocyanate (P
API) etc.

In addition to the liquid synthetic resin described above, an acrylic resin can also be used.

The acrylic resin is a polymer resin whose main component is a derivative of acrylic acid or methacrylic acid. Acrylic resins are usually classified into acrylic rubber type and acrylic resin type.

The acrylic rubber type is a flexible polymer based on a higher acrylic ester which is a soft monomer, and as a cross-linking agent, amines such as ethyltetramine and tetraethylenepentamine, sulfur and polyvalent metal compounds. It is obtained by adding and mixing. The higher acrylic acid ester used is, for example, butyl acrylate (Tg: -5
4 ° C.), 2-ethylhexyl acrylate (Tg: -8
5 ° C.) and the like, and it is generally used in an amount of 85% or more based on the total amount of the monomer (() indicates glass transition temperature).

Higher acrylic acid esters are used as the acrylic resin type, but the amount thereof is small, and in addition to lower acrylic acid esters such as methyl acrylate, ethyl acrylate and methyl methacrylate, vinyl acetate, styrene, acrylonitrile and the like are used. Hard monomers with high glass transition temperatures are used. Therefore, since the acrylic resin system has poor flexibility, plasticity (for example, phthalic acid esters, fatty acid esters) is generally used together.

Acrylic resins have the advantage of excellent weather resistance.

The mixing ratio of pumice, shirasu and liquid synthetic resin is 2 to 4 parts by weight of pumice and 70 to 90 parts by weight of a mixture of 1 part by weight of shirasu, and 30 to 10 parts by weight of liquid synthetic resin. A range of parts is preferred. Of course, pumice stone can be used alone. In this case, the mixing ratio is 70 pumice.
A range of 30 to 10 parts by weight of liquid synthetic resin is preferable with respect to 90 to 90 parts by weight.

Mixing of the mixture is carried out by using a pug mill mixer, a pan type mixer, etc. while confirming the construction situation at the site.

Next, a general example of the room temperature pavement method using pumice and shirasu of the present invention will be described with reference to the drawings.

First, after laying a sand layer on a road surface to be paved, cut crushed stones are laid and rolled by a roller to form a cut crushed stone layer to make a roadbed. Then, the heated asphalt mixture for water permeability is spread on the cut crushed stone layer and rolled by a roller to construct a water-permeable asphalt concrete layer to obtain the base of the present invention. On this base, a mixture of purified pumice in an amount of 2 to 4 parts by weight and purified shirasu in an amount of 1 part by weight, and a liquid synthetic resin, 90:10 to 7
Mix with a pan mixer at a weight ratio of 0:30 to create a mixture with pumice and shirasu that has a water permeability and a natural texture, and shape with a laying iron with a rake and press and press. A composite layer as a surface layer of the present invention using finish, pumice stone and shirasu is obtained.

[0031]

EXAMPLES Examples of the present invention will be described below.

[0032]

[Materials used]

(1) Purified pumice and shirasu (commercially available)

The particle sizes of the purified pumice and shirasu are shown in Table 2.
As shown in.

[0035]

[Table 2]

(2) Liquid synthetic resin

I) Epoxy resin main agent: Color Palt TO-A (trade name, manufactured by Nisso Chemical Co., Ltd.) Viscosity (23 ° C.) = 1100 cps Specific gravity (23 ° C.) = 1.15

Ii) Epoxy resin curing agent: Colorphalt TO-B (trade name, manufactured by Nisso Chemical Co., Ltd.) Viscosity (23 ° C.) = 300 cps Specific gravity (23 ° C.) = 1.03

[0039]

[Example-1]

In a laboratory test, the physical properties of a mixture of pumice and shirasu mixed with an epoxy resin (main component: hardening agent = 2: 1) were measured. For the measurement, a test piece of 4 × 4 × 16 cm was prepared, and the compression, bending and deflection were measured by JI.
A measurement test was performed according to the test method shown in SR5201. The results are shown in Table 3.

[0041]

[Table 3]

[0042]

[Example-2]

The sidewalk was paved. First of all, spread the sand on the road surface to be paved by hand and roll it with a Bomac roller to make a 10 cm thick sand layer. Spread the cut crushed stone on this upper surface with a guide and roll it with a Bomak roller to roll it to 10 cm. A thick crushed stone layer was constructed to make a roadbed.
Then, the water-permeable heated asphalt mixture is laid on this roadbed by hand, and it is rolled with a Bomak roller to produce 3
Build a permeable asphalt concrete layer of cm thickness,
A pavement and a base for paving a room temperature mixture using shirasu were made.

Next, the production of the room temperature mixture using pumice and shirasu was carried out in a simple plant installed on site. First, pumice stone is put into a 200 kg kneading pan mixer, then shirasu is put into it, and then an epoxy resin prepared by adding 1 part by weight of a hardening material to 2 parts by weight of a main ingredient in advance is mixed and mixed for about 3 minutes. After that, it was discharged. The mixing ratio of pumice, shirasu and epoxy resin was 25 parts by weight of epoxy resin with respect to 75 parts by weight of a mixture of pumice 2 parts by weight and shirasu 1 part by weight.

The manufactured room temperature composite material was carried by a unicycle to a pavement location and paved at a thickness of 1 cm of the room temperature composite material on the base.
That is, the room temperature mixture was laid with a rake and a metal iron together, and further shaped and pressed with the metal iron to finish. The laying property with a metal iron was good, the spread was good, and the work was easy. The finished state is also good, and the pavement after curing is a durable pavement having the same physical property values as the physical property values of the composite material shown in Example-1, and forms a water-permeable pavement, In addition, epoxy resin is a colorless and transparent binder, unlike asphalt or cement, which is a binder usually used for paving,
It was possible to form a natural color pavement that had the texture of pumice and shirasu.

[0046]

The pumice stone has hitherto been used mainly as a culture soil for horticulture or as a drainage material for a ground or the like, and has not been used for pavement. Also, shirasu was used only for a part of pavement. That is, it was used only as a subgrade and a subgrade, and also as a subgrade by stabilizing shirasu with cement. This is a room temperature pavement method using pumice and shirasu of the present invention,
Pumice stone and shirasu can now be used for the surface of pavements.

That is, since pumice and shirasu are mixed with a liquid synthetic resin as a binder,
The liquid synthetic resin binds between the particles of pumice and shirasu, and the synthetic resin is impregnated and impregnated into the porous parts of the particles of pumice and shirasu, and the physical properties of the mixture shown in Example-1 are As shown, the disadvantages of the conventional pumice and shirasu, which are brittle, have been dramatically improved, and pumice and shirasu can be used as the surface layer of a durable pavement.

Further, since pumice and shirasu can be used for the surface layer, the natural texture of pumice and shirasu that have particle size permeability can be used to create a natural environment such as sidewalks, promenades, and parks. It is now possible to build a natural color pavement that also has water permeability that does not destroy the landscape.

Furthermore, since the surface layer mixture can be manufactured and applied at room temperature, there is a practical advantage that there is no need for temperature control.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a main part illustrating an embodiment.

[Explanation of symbols]

(1) is the road surface, (2) is a sand layer, (3) is a crushed stone layer,
(4) is a water-permeable asphalt concrete layer, (5) is a mixture layer as a surface layer

Claims (1)

[Claims] 1. A room-temperature pavement method using pumice and shirasu, characterized in that a pumice stone and a shirasu mixed with a liquid synthetic resin are paved and shaped.