JPH04252289A - Soil stabilizing material - Google Patents

Abstract

PURPOSE:To obtain a soil stabilizer capable of absorbing water in soil, fixing and stabilizing state of soil. CONSTITUTION:A soil stabilizer having structure of a highly water absorbing resin at least partially introduced into pores of active carbon, composed of an integrated composite material of highly water absorbing resin and active carbon, showing a granular, lump, pillar-shaped or fibrous shape. The soil stabilizer is mixed with hydrous soil, used, shows a solid shape after absorption of water in soil, prevents soil from flowing, fixes and stabilizes state of soil.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a soil stabilizing material that has a remarkable effect on absorbing water in soil. This invention relates to a soil stabilizing material that can absorb, fix and stabilize the form of soil.

0002

BACKGROUND OF THE INVENTION Soil is stable in its form when dry, but once it becomes saturated with water due to rainfall, it becomes less stable and more fluid. For example, there is a problem with sand and dirt flowing on slopes and steep slopes. In addition, since the hydrated soil produced in civil engineering works has high fluidity, it is difficult to carry it out by truck or dump truck, and there are problems in that it falls off both ends of the belt when being transported by a belt conveyor. In order to solve this problem, in recent years, as soil stabilizers, water glass-based agents have been used to stabilize the lumps with their adhesive strength, and inorganic hydrating agents such as cement and lime have been used to improve their hydration effects. A number of methods have been developed, including stabilization methods and methods for improving coagulation using polymer superabsorbent resins made of crosslinked starch and acrylic acid. However, since cement-based solidifying materials are strongly alkaline, handling of earth and sand becomes a problem. Furthermore, although polymer superabsorbent resins can absorb several hundred times their own weight in water, they have the problem of becoming pasty after absorbing water and not being able to sufficiently fix and stabilize soil.

0003

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems. In other words, the present invention can absorb water in the soil, fix the soil morphology, and
The purpose is to provide a soil improvement material with a high stabilizing effect.

0004

Means for Solving the Problems In order to achieve the above object, the present invention has the following configuration.

That is, the soil stabilizing material of the present invention is made of a composite integrated product of a super absorbent resin and activated carbon, and has a structure in which at least a part of the super absorbent resin has entered the pores of the activated carbon. It is a soil stabilizing material that has a granular, lumpy, columnar or fibrous form.

[0006] Furthermore, the soil stabilizer of the present invention is more preferably characterized in that it contains a fibrous material.

[0007]

[Operation] The present invention will be explained in more detail below. The soil stabilizing material of the present invention is a soil stabilizing material in which activated carbon in the form of granules, blocks, columns, or fibers is integrated into a composite with a super absorbent resin. Even after the resin part absorbs water, it is strongly bonded to the activated carbon, which has a high soil stabilizing effect, and is completely different in concept and method from proposals that simply use superabsorbent resin.

[0008] In the present invention, the activated carbon may be made of any raw material such as wood, sawdust, coconut shell, lignin, cow bone, blood, lignite, copper charcoal, day charcoal, coal, or other organic fibers. However, as for its form, granular, lumpy, columnar or fibrous forms can be used for the purpose of the present invention, and powder forms are not suitable. As for the size of the granular, lumpy, or columnar form, the diameter or length is preferably 1 to 300 mm, more preferably 5 to 100 mm because excellent effects can be obtained. Further, a fibrous activated carbon having a longer length than its diameter is also a preferable form because the fibrous activated carbon can be entangled with each other. In the case of a fibrous form, the diameter may be very thin, such as less than 1 mm, and the diameter may be from several tens to several tens of microns.
It may be 0 micron. Such fibrous activated carbon can be produced by carbonizing raw material fibers and then activating them. For example, it can be obtained by forming pulverized charcoal powder into appropriate granules or lumps using tar, pitch, or the like as a binder, drying, firing, and activating the powder. For activation, a method using steam activation, a method using chemical activation, a method using oxidation in air or chlorine gas, etc. can be used. In addition to such activated carbon, zeolite, activated alumina, molecular sieves, silica gel, silica alumina, etc. may be mixed and used.

[0009] As the super absorbent resin, water-insoluble resins such as modified starch, cellulose type, starch-acrylonitrile graft copolymer, polyacrylonitrile derivative, polyacrylamide type and polyacrylate type, vinyl acetate/ Super absorbent resins with extremely high water absorption capacity, such as saponified methyl acrylate copolymers and crosslinked polyacrylate polyvinyl alcohol copolymers, can be used. Among them, starch-acrylonitrile graft copolymers and crosslinked polyacrylate polyvinyl alcohol copolymers have high water absorption ability and can be preferably used.

These polymer superabsorbent resins may be used alone or in combination of two or more.

The soil stabilizing material of the present invention is constructed as a composite integrated product of the activated carbon and the super absorbent resin, and at least a part of the super absorbent resin has entered the pores of the activated carbon. It is characterized by having a structure. Due to this structure, the detailed reason is not clear, but even after the superabsorbent resin absorbs water, it becomes a solid structure rather than a paste-like one, and has a high effect on stabilizing the soil. .

[0012] The composite integration ratio of activated carbon and super absorbent resin is activated carbon/super absorbent resin = 20/80 to 80/
A content ratio (volume ratio) of 20 is preferred.

[0013] Further, such a composite integration method is not particularly limited, and for example, using equipment such as a rice cracker, a stirrer, or a kneader, adding an appropriate amount of liquid such as water,
A method of mixing while stirring, a method of mixing while kneading, or a method of making both components absorb water under a high humidity condition and combining them into a composite body can be used. In this way, the composite and integrated product can be made into, for example, granular, granular,
It can be obtained by molding into an appropriate shape such as a lump, a column, or a fiber, and then drying it. Further, the shape of the composite integrated product may be a mixture of a plurality of these types, an amorphous shape, a mixture of sizes, a mixture of various shapes, etc. The thus obtained composite integrated mixture no longer returns to its original individual form, but has a strongly bonded structure. In the process of such composite integral molding, it is particularly preferable to mix fibrous materials made of natural fibers, synthetic fibers, etc., because the form remains stable even after absorbing a large amount of water, and the soil stabilizing effect is also excellent. . Thus, the soil stabilizing material of the present invention can be used to prevent soil runoff in places where sand and earth and sand easily flow, such as slopes and slopes, and to stabilize various soft soils and grounds that occur during civil engineering work. Stabilize the form
It can be preferably used for immobilization.

[0014]

Effects of the Invention The soil stabilizing material of the present invention is a composite body of a porous adsorbent and a superabsorbent resin, which has a structure in which at least a part of the superabsorbent resin enters the pores of the porous adsorbent. It is a chemical substance that maintains a firm form even after absorbing water in the soil, suppressing the fluidity of the soil, and fixing and stabilizing the form of the soil.

The soil stabilizing material of the present invention can fix the soft form of water-containing soil generated in civil engineering work, etc., and therefore can facilitate the work of transporting water-containing soil. In addition, it not only simplifies work in various civil engineering works by preventing the runoff of sand and earth from slopes and slopes, stabilizing soft soil and ground, but also stabilizing footing and fixing the soil form. , can be preferably used for stabilization.

[0016]

EXAMPLES The present invention will be explained in more detail with reference to examples below, but the validity and scope of the rights of the present invention are not limited or restricted by these examples. Rather, it brings about the next application and development. In addition, in the examples, all "proportions" are based on weight.

Example 1 Zinc chloride-activated activated carbon granules and starch-acrylate graft polymer powder were mixed into zinc chloride-activated activated carbon granules/starch-acrylate graft polymer powder = 30/
A mixture was prepared at a ratio of 70% and kneaded using a kneader while adding water. Approximately 1 such mixture
It was crushed into granules of 0 mm square and dried in a dryer to obtain granules. Such granules had an extremely strong bond and had a structure that could no longer be easily separated into individual components.

When 2% of the thus obtained granular material was mixed into the soil, which contained water and became easy to flow, the morphology of the soil became stable. As a comparative example, 2% of the same starch-acrylate graft polymer powder used in the example was added and mixed directly into soil, but the morphological stability of the soil was inferior to that of the example. was.

Example 2 Particles of zinc chloride-activated activated carbon, starch-acrylate graft polymer powder, and 10 mm long polyester short fibers were mixed into zinc chloride-activated activated carbon/starch-acrylate graft polymer/polyester short fibers. = 30/65/5 ratio, kneaded and mixed using a kneader while adding water, and cast the slurry mixture onto a belt and dried it with a hot air dryer to form a sheet. I created something. Next, the sheet-like material was finely cut into strips to obtain a composite mixture in the form of chips. When the thus obtained composite integrated product in the form of chips was mixed into water-containing soil, the morphology of the soil became stable.

Claims (2)

[Claims] Claim 1: Comprised of a composite integrated product of a super absorbent resin and activated carbon, in which at least a part of the super absorbent resin has entered into the pores of the activated carbon, and is in the form of granules, lumps, columns, or fibers. A soil stabilizing material that takes the form of: 2. The soil stabilizing material according to claim 1, wherein the composite material contains a fibrous material.