JPH02233544A - Concrete composition - Google Patents

Abstract

PURPOSE:To effectively utilize an industrial waste by blending a latent hydraulic material with an alkaline waste water having >=pH8. CONSTITUTION:With a latent hydraulic material consisting of a glassy material containing large amounts of a granulated blastfurnace slag, a converter slag, SiO2, Al2O3 and CaO and having >=90% glass formation degree, >=1.5 basicity and 1000-10000cm<2>/g Blaine specific surface area, an alkaline waste water generated from a concrete-producing factory, etc., having >=pH8 and adjusted to be <=10wt.% slag concentration by addition of water is blended. A plasticizer such as a lignin- or melamine-based one is used in combination therewith as necessary, thus obtaining the objective concrete composition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Production] The present invention relates to concrete compositions, particularly concrete compositions utilizing alkaline drainage gold.

[Conventional technology and its discussion]

Alkaline wastewater is generated in concrete manufacturing factories and concrete product factories, and has a rating of about -12 to 16.
To prevent pollution, the water is discharged after neutralization.

Normally, it is neutralized with a chemical consisting of an acidic substance and then drained, but concrete washing water generated at a concrete IJ-t manufacturing plant and concrete centrifugal fjy. For slag water etc. generated in a mold manufacturing factory, use a drain bit to precipitate the cement content, neutralize the top and bottom, and then drain the water.The precipitated portion should be disposed of with water remaining, or the water should be removed. The method used is to compress and dehydrate the waste before disposing of it.

However, such wastewater treatment is expensive;
There were issues such as the limited number of disposal sites for the sediment.

As a result of various studies to solve the above problems, the inventor of the present invention found that
The present invention was completed based on the knowledge that by using a specific material, concrete can be manufactured without requiring the expense of treating alkaline wastewater.

[Ninth means to solve the problem]

That is, the present invention is a concrete composition whose main components are a latent hydraulic material and an alkaline wastewater having a rating of -8 or higher.

The present invention will be explained in detail below.

Latent hydraulic material used in the present invention (hereinafter referred to as hydraulic material)
The term refers to granulated blast furnace slag (hereinafter referred to as granulated slag), converter slag, and other slags produced as by-products when refining metals, as well as volcanic ash, S102, Al20, etc.
3. It contains a large amount of CaO and is glassy.

Among these, it is particularly preferable to use granulated slag. stomach.

The lathization rate of the granulated slag is preferably 90% or more, and the basicity is preferably 1.5 or more, particularly preferably 1.7 or more.

The fineness of the granulated slag is preferably 1,000 Gm''/9 or more in Blaine specific surface & (hereinafter referred to as Blaine value), and particularly preferably 4.000 to 10,000 2/&. If it is less than 1,000α2/g, the hydraulic properties tend to decrease; if it exceeds io,oooα2/!I, the hydraulic properties increase, but the fluidity tends to deteriorate.

The alkaline wastewater used in the present invention is wastewater generated in various industrial plants, especially concrete IJ-to manufacturing factories and concrete product factories, and has a P} of 18 or more, preferably 12 to 14. If it is less than -8, the hydraulic properties of the hydraulic material become small. Ma7'
If the cpH exceeds 14t, the hydraulic properties will increase, but normally,
In particular, wastewater from concrete manufacturing plants rarely exceeds pH 14.

Alkaline wastewater from a concrete factory usually contains most of slag. There is almost no difference in the concentration of slag solids contained in alkaline wastewater (hereinafter referred to as slag concentration), and hydraulic materials harden regardless of the concentration. However, when using it for producing hardened mortar or concrete, it is preferable to add water and adjust the slag concentration to 10% by weight or less in order to control fluidity. The use of wastewater adjusted in this way, t, is
Use the appropriate amount to meet the required strength and fluidity. In other words, it can be used in the same way as water for ordinary cement. Therefore, if necessary, for example, a fluidizing agent or the like may be used in combination. Examples of the fluidizing agent include β-NS type, lignin type, melamine type, oxycarboxylate type, polyol type, mollusc type and polycarboxylic acid type.

In the present invention, the method of mixing the hydraulic material and the alkaline waste water is not particularly limited.

From the viewpoint of transportation costs, it is preferable to use the concrete composition of the present invention for concrete products in factories where alkaline wastewater is generated. The curing conditions are the same as for ordinary concrete products.

〔Example〕

Hereinafter, the present invention will be further explained based on Examples.

Example 1 Using granulated slag with a lathization rate of 90%, basicity of 1.85, and Blaine values changed as shown in Table 2, Table 1
A mortar was prepared with the composition shown below.

Table-1 Sex measurements were conducted. The results are also listed in Table-2. The compressive strength ratio is 315kgf/cr for the experimental 1-1 compressive strength! L2
This is the ratio when 1.00.

Materials used: Cement-a: Ordinary boltland cement, manufactured by Denki Kagaku Kogyo Co., Ltd. -b: Granulated slag, sand manufactured by Nippon Steel Muroran:
Produced in Himekawa, Niigata Prefecture, 5 1m sewage 10: Tap water - d: Alkaline wastewater, concrete manufacturing factory wastewater, slag #k degree 10 weight ratio, pH 12.7 Mixed mortar k 4 x 4 x 16 cm poured into a formwork, A specimen was created. Compressive strength at 7 days old. ! Engineering
Flow Example 2 based on the flow trial sales method of R 5 2 0 1 Brain * 5,9 6 0 (:Fn2/ .!i'
Example 1 was carried out in the same manner as in Example 1, except that the granulated slag was used and the alkaline waste water value of pH 12.7 was adjusted with n2so or NaOH as shown in Table 6. The results are also listed in Table-6.

Materials used> H2So, manufactured by B San Kagaku Co., Ltd., concentration 98 weight water-e
: NaOH, Tokuyama 1st Sha Rip,! 10 times! Amount % Other details are the same as in Example 1.

〔Effect of the invention〕

The following effects can be expected from the present invention.

1. Since alkaline wastewater is used, neutralization treatment of alkaline wastewater is not required.

2. Alkaline wastewater from concrete manufacturing plants is used in conjunction with latent hydraulic materials to harden it and make it easier to dispose of.

6. It is now possible to manufacture concrete products using alkaline wastewater, which conventionally does not harden on its own and requires a large amount of money to treat water and water.

4. Industrial waste such as granulated slag and alkaline wastewater can be effectively used.

Patent applicant: Denki Kagaku Kogyo Co., Ltd.

Claims (1)

[Claims] (1) A concrete composition whose main components are a latent hydraulic substance and alkaline waste water with a pH of 8 or more.