JP2003119705A - Artificial roadbed material using waste, and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a problem of limited usage of coal ash in order to effectively use the coal ash as aggregate, by mixing the coal ash, cement, and bentonite with each other to produce a granulated body, and enhancing the strength of the granulated body as the aggregate. SOLUTION: The problem is solved by providing an artificial roadbed material using waste, and a method for producing the same. In implementation of the method, one or more waste materials consisting of glass, earthenware, concrete crusts, etc., are crushed to prepare a crushed material which is then mixed to the coal ash together with waste sand, and further cement and a cement admixture are added to the resultant mixture, to thereby produce the granulated body. In this manner the granulated body as the waste is available as the artificial roadbed material.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the treatment of coal ash and its effective use.

[0002]

2. Description of the Related Art Direct disposal of coal ash is prohibited by the Waste Management Law because coal ash may contaminate groundwater. Therefore, in general, landfill processing is performed at a managed landfill site. However, the landfill site will soon be full, and it will be difficult to establish a new landfill site thereafter.

Therefore, as one of the coal ash treatments, coal ash is mixed with cement and bentonite to form a granule, which is effectively used as a sea sand substitute for revetment work. .

On the other hand, most of wastes such as glass and pottery are also landfilled, but they are partially processed into lightweight aggregate for use.

[0005]

However, there are the following problems in how to use these.

Even if coal ash, cement, and bentonite are mixed to produce a granulated product, its strength as an aggregate is low, so that its use is limited.

Further, in order to manufacture glass, earthenware and the like as a lightweight aggregate, a crushing and shaping process must be performed, so a large amount of energy is required, and the product is more expensive than the current competitive products. The marketability is low and it is difficult to use.

[0008]

The present invention is intended to solve the above-mentioned problems by the means described below.

The artificial roadbed material using waste according to the present invention is a mixture of coal ash with a crushed material obtained by crushing one or more wastes such as glass, pottery and concrete waste, and waste sand, and cement and It is characterized in that a mixture containing a cement admixture is formed into granules.

In the method for manufacturing an artificial roadbed material using waste according to the present invention, coal ash is mixed with a crushed material obtained by crushing one or more wastes such as glass, pottery, and concrete waste, and waste sand. Along with this, cement and a cement admixture are added to form a granulated body with a granulator.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to FIG.

Glass, pottery, concrete debris, etc. are crushed by a crusher into a crushed product, mixed with waste sand by a mixer, and then combined with coal ash, cement, cement admixture, and water in a granulator. It Cement and cement admixtures are used as binders in mixtures. Even if these are partly or wholly mixed together and then mixed in the granulator,
They may be separately supplied to the granulator by a feeder or the like and mixed. These mixtures are kneaded in a granulator,
Granulate to the required size. However, it must be within the range of the particle size regulation in the sieving test of the roadbed material, that is, 40 mm or less. After curing, it becomes a roadbed material.

The blending amount of each material forming the granulated body is preferably determined in a preferable range in consideration of the following circumstances.

When the proportion of the crushed mixture of glass, earthenware, concrete glass, etc. increases, the strength of the granule increases,
The throughput of coal ash is reduced. Since the main purpose of the present invention is to treat coal ash, it is possible to increase the proportion of coal ash and maintain the required strength.

With respect to the cement and the cement mixture used as the binder, the strength of the granule increases as the mixing ratio increases, but the manufacturing cost increases. Consider the proportion that can retain the required strength.

That is, in the roadbed material test for use as a reclaimed crusher, the abrasion loss is standard 5
It is necessary that the corrected CBR value (%) is 0% or less and the standard is 20 or more.

Next, examples of blending each material in the present invention are as follows. The blending amount is% by weight.

[0018]   Formulation example     Coal ash 52%     Crushed glass, pottery and concrete waste + waste sand 22%     Cement 7%     Cement admixture 1%     Water 18%         Total 100%

The mixture is granulated with a granulator to a size of 40 mm or less and cured to obtain a roadbed material. The curing was carried out for 7 days.

Table 1 shows the test results of the roadbed material obtained as described above.

[0021]

[Table 1]

As is clear from Table 1 above, the roadbed material according to the present invention satisfies the standards for the roadbed material in terms of grain size, abrasion loss and corrected CBR value.

[0023]

As described above, the present invention has the following effects.

The crushed material obtained by crushing glass, pottery and concrete waste was added to coal ash together with the waste sand so as to serve as the core of the granulated body, so that the strength of the granulated body was increased, and further, the cement as a binder was used. By adding a cement admixture in addition, the strength was further increased, and it was possible to manufacture a granulated body satisfying the standard as a roadbed material.

[Brief description of drawings]

FIG. 1 is a block diagram showing a process of manufacturing an artificial roadbed material using waste according to the present invention.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshihiro Tokashiki             1176-1, Kokuba, Naha City, Okinawa Prefecture (72) Inventor Toshikatsu Higa             Toro, Inc. 5-1 Kakizaki, Gushikawa City, Okinawa Prefecture             Inside Pical Techno Center (72) Inventor Yuji Miyagi             12-2 Kakizaki, Gushikawa City, Okinawa Prefecture Industrial Technology, Okinawa Prefecture             Inside the surgery center (72) Inventor Eiyasu Hira             5-2-1 Makiminato, Urasoe City, Okinawa Prefecture             Inside the corporation (72) Inventor Ken Katori             1-9-6 Ginowan, Ginowan City, Okinawa Prefecture F-term (reference) 2D051 AD07 AF02 AF03 AF04 AF06                       AF07 AH02 CA09 EA01 EA06                 4G012 PA26 PA30 PE04

Claims (2)

[Claims] 1. A granulated product is a mixture of coal ash, crushed material obtained by crushing one or more wastes such as glass, pottery and concrete husk and waste sand, and cement and cement admixture. Artificial roadbed material using waste that is formed 2. A method of mixing coal ash with crushed material obtained by crushing one or more wastes such as glass, pottery, concrete waste, etc. and waste sand, adding cement and a cement admixture, and granulating with a granulator. A method for manufacturing an artificial roadbed material using waste, which is characterized as a body.