JPH02102161A - Concrete flat board - Google Patents

Abstract

PURPOSE:To provide an inexpensive concrete flat board having a sufficient strength by dispersing and containing a stone sludge which is an industrial waste and iron powder in a concrete board having a two-layer structure of a surface and base layer parts. CONSTITUTION:Sand is kneaded with gravel, dried powder of stone sludge which is an industrial waste produced in quarrying out or working stone, iron powder generated in iron manufacturing processes, a cement and water and the resultant kneaded material is cast into a box-shaped mold form, dewatered while pressing the kneaded material with a flat plate, etc., thereon and somewhat hardened to form a base layer part 2. A kneaded material prepared by kneading quartz sand with dried powder of stone sludge, iron powder, a cement, pigment and water is then cast from the upper side of the base layer 2 and dewatered while pressing the resultant material thereon to form a surface layer part 3, which is simultaneously integrated with the base layer part 2. The obtained concrete flat board 1 of the two-layer structure is suitably used for paving parks, sidewalks, etc.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a technology for making effective use of stone sludge, which is industrial waste,
This relates to concrete slabs used for parks, sidewalks, exterior floor finishing of buildings, etc.

(Conventional technology and its problems) In the former case, waste stones and sludge, which are industrial waste generated during stone processing and mining, are simply crushed to an appropriate size or particle size and are directly deposited under the road. It is reused as roadbed material, etc., but in the latter case, the fine powder with a particle size of 0.1 mm or less contains water in the amount of S and forms a sludge-like shape.
Difficult to reuse. Therefore, conventional techniques have been used to remove some of the moisture from the sludge, dry it, mix it with clay, bake it into a plate shape, and incorporate microorganisms into it to use it as a deodorizing material or soil improvement material. ing. However, these sludge utilization techniques require baking and hardening, which is not cost-effective for reusing this type of waste. For this reason, in reality, such sludge is disposed of by burying it in the ground.

On the other hand, for paving parks, sidewalks, poolsides, parking lots, etc., and for finishing the exterior floors of buildings, interlocking, which is superior in terms of cost but less beautiful than tiles and granite, is used.
Blocks are widely used, and interlocking blocks are generally formed by integrally molding two layers: a base concrete layer and a surface layer mortar. However, recently, paved surfaces in parks and the like have been constructed with emphasis on design, requiring complex shapes, and for this reason, there is a problem that ordinary mortar is insufficient in terms of strength and wear. For this,
Some materials are made to be reinforced by dispersing short fibers such as steel fibers, but they are expensive.

(Purpose) The present invention was made in view of the above-mentioned problems, and its purpose is to effectively utilize stone sludge as industrial waste, and to sufficiently cover paved surfaces with strong design requirements such as parks. An object of the present invention is to provide a concrete flat plate that can be formed at a low cost while maintaining a high strength (means for solving the problem). It has a two-layer structure with the base layer and the surface layer consists of silica sand, dry powder of stone sludge, iron powder, cement,
The base layer is made by kneading and press-molding sand, gravel, dry powder of stone sludge, iron powder, and cement. It has a two-layer structure with a base layer.The surface layer is made by kneading and press-molding silica sand, dry powder of stone sludge, and cement pigment, and the base layer is made of dry powder of sand, gravel, stone sludge,
It is characterized by being made by kneading and pressing cement.

The concrete slab 1 shown in the drawings will be explained in more detail using a general wet manufacturing method.

This concrete flat plate 1 consists of a surface layer 3 as a first layer and a base layer 2 as a second layer.

The surface layer 3 is made by adding water to silica sand, sludge generated when cutting or processing stones such as granite, iron powder dust generated during iron manufacturing, cement, and a desired pigment. It is formed from a kneaded material.

These mixing ratios are, for example, as shown in the examples described below, but the amount of sludge is preferably about the same amount or about twice that of cement. Further, it is desirable that the amount of dust is about half the amount of sludge.

The base layer 2 is formed of a semi-fluid kneaded mixture of sand, gravel, the sludge, the dust, and cement with water added thereto. The mixing ratio of these sludges etc. that compose the base layer portion 2 may be determined by the examples described below, for example.
It is desirable to maintain the amount of sludge or dust within the same range as in the surface layer described above.

Then, the kneaded material constituting the base layer part 2 is poured into a box-shaped mold with an open top, and water is removed while being pressed from above with a flat plate, etc., and the base layer part 2 is formed by solidifying to some extent.

Thereafter, the above-mentioned kneaded material constituting the surface layer 3 is poured from above the base layer 2, water is removed while pressing from above, and the mixture is integrated with the base layer 2, thereby forming the two-layer concrete flat plate 1. It is formed.

The pressing surface of the press plate used when pressing the surface layer 3 has a mold shape that can form a desired surface shape on the concrete flat plate 1, for example, a concave mold surface that can form a large number of convex protrusions on the concrete flat plate. It becomes.

The surface layer 3 of this two-layer concrete plate 1 is hard because hard granite powder and dust are dispersed therein, compared to the case of ordinary mortar made only of silica sand and cement, and the surface layer 3 has various fine grains on the surface. Not only is it possible to construct a new design, but the strength is also increased.

Furthermore, since the fine-grained stone sludge and dust act as aggregates for the base layer 2 and surface layer 3, the bonding force of cement is also improved.

In this way, the sludge such as the above-mentioned stone powder as industrial waste can be effectively used, and the concrete flat plate 1 can be manufactured at low cost since the amount of cement is reduced by the amount of sludge and the like.

Note that a two-layer concrete slab can also be manufactured by the dry method. In this case, as well as the wet method, sand and
Water is added to gravel, cement, sludge produced when cutting granite, and iron powder dust produced during iron manufacturing to make it semi-fluid, and the mixture is poured into a box-shaped formwork with an open top. Forming the base layer 2, silica sand, cement,
A suitable amount of pigment, the above-mentioned sludge, and a mixture obtained by stirring these thoroughly without adding water to the dust are added to the above-mentioned base layer part 2.
A two-layer concrete flat plate 1 is formed by forming the surface layer 3 by forming 41 layers, and removing water while pressing from above, and solidifying the base layer 2 and the surface layer 3 integrally.

This concrete flat plate 1 also has sufficient strength and is inexpensive, like the one made by the wet method described above.

In addition, during pressing, although not shown, a paper pattern forming a predetermined uneven surface is laid on top of the concrete flat plate 1 formed as described above (on the back surface of the base layer), and the second stage is Pour the semi-fluid kneaded material forming the surface layer 3, further layer the kneaded material for forming the base layer 2, and repeat this operation several times to stack the concrete slabs 1 in several tiers for curing. Therefore, this type of concrete flat plate 1 can be easily manufactured without using any other press equipment.

In the above structure, both the surface layer 3 and the base layer 2 contain dust in addition to stone sludge, but a concrete flat plate with excellent strength can be obtained even without containing dust.

(Example) Example-1 Base layer: 20% sand, 20% gravel, 30% sludge
, 10% dust, and 20% cement are mixed, water is added to make it semi-fluid, and the mixture is poured into a mold to a thickness of about 25 to 57 mm and solidified.

In addition, the surface layer contains 50% silica sand, 20% sludge, and 1 dust.
0% cement, 19% cement, and 1% pigment, and is formed on the base layer to a thickness of about 3 to 5 mm.

The two-layer concrete slab will be approximately 30 am square in size.

The bending strength of the concrete slab obtained by this method is
800Kg/cm~1, OO0Kg7cm.

Example-2 Base layer: 20% sand, 20% gravel, 40% sludge
, cement at a ratio of 20% is mixed, water is added to make it semi-fluid, and the mixture is poured into a mold to a thickness of about 25 to 57 mm and solidified.

The surface layer is 50% silica sand and 30% sludge.

The composition has a ratio of 19% cement and 1% pigment, and is formed on the base layer to a thickness of about 3 to 5 mm.

The two-layer concrete slab will be approximately 30 am square in size.

The strength of the concrete slab obtained by this is 60
0 g/cm to 800 g/cm.

(Effects of the Invention) As described above, the present invention provides a two-layered concrete plate with a surface layer and a base layer, in which stone sludge, which is an industrial waste, is added to the base layer and the surface layer, or in addition to this, iron from steel manufacturing is added. powder(
Since the concrete is mixed and dispersed as aggregate by the amount of cement reduced, it is possible to provide an inexpensive concrete flat plate that has sufficient strength and can be adapted to various design shapes.

Furthermore, it is possible to effectively utilize industrial waste such as sludge.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a concrete flat plate according to an embodiment of the present invention. 1. Concrete flat plate 2. Base layer 3. Surface layer Applicant: Kawai Kaken Kogyo Co., Ltd. Ace Electronics Co., Ltd.

Claims (6)

[Claims] (1) It consists of a two-layer structure of a surface layer and a base layer.The surface layer is made of silica sand, dry powder of stone sludge, iron powder, cement, and pigments kneaded and pressed, and the base layer is made of sand, gravel, and stone. A concrete flat plate made by kneading and pressing dry sludge powder, iron powder, and cement. (2) The surface layer is composed of silica sand, dry powder of stone sludge, iron powder, cement, and pigment in a weight ratio of 5:2:1:2:1. Concrete slab as described in Scope 1. (3) The base layer is composed of dry powder of sand, gravel, stone sludge, iron powder, and cement in a weight ratio of 2:2:3:1:2. The concrete slab described in paragraph 1. (4) It consists of a two-layer structure of a surface layer and a base layer.The surface layer is made by kneading and pressing silica sand, dry powder of stone sludge, cement, and pigment, and the base layer is made of dry sand, gravel, and stone sludge. A concrete slab characterized by being made by kneading and pressing powder and cement. (5) The surface layer portion is composed of silica sand, dry stone sludge powder, cement, and pigment in a weight ratio of 5:3:2:1. concrete slab. (6) The base layer is composed of sand, gravel, dry powder of stone sludge, and cement in a weight ratio of 2:2:4:2. concrete slab.