JPS63159249A - Manufacture of inorganic hardened body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to an inexpensive method for producing an inorganic cured product which is mainly composed of a hydraulic inorganic material and is used as a mm construction material.

[Background Art 1] Conventionally, a method has been implemented in which defective products generated in the manufacturing process of inorganic hardened bodies such as cement products are crushed and mixed as a filler, and the defective products are reused. However, since this defective crushed product does not contribute to the development of the strength of the product, the strength decreases as the amount of contamination increases, as shown in Figure 1. Therefore, the contamination of this crushed product is It is limited to about %.

On the other hand, a large amount of cement product waste is generated from the demolition of buildings, etc., and this waste is often used in landfills or dumped into mountains, resulting in wasted resources.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to reuse a hardened product such as cement 11 to produce a low-cost, high-strength inorganic hardened product. It is to do 91R.

[Disclosure of the Invention] The method for producing an inorganic cured body of the present invention comprises: 10% by weight or more of hydraulic inorganic material and 10 to 50% by weight of hydraulic inorganic material pulverized to a particle size of 300 μm or less based on the total solid content. A molding material is prepared by mixing the material with a hardened body as a binder by adding water, and after forming the molding material into a hollow shape, it is fired at a firing temperature of 400 ° C. or higher, This configuration achieves the above object.

Hydraulic property j in the present invention! ! The fibrous material refers to a binding material that hardens by reacting with water, and includes, but is not particularly limited to, cement, slag, gypsum, and the like. Of these,
As the cement, ordinary Portland cement, alumina cement, early strength cement, jet cement, blast furnace cement, etc. can be used. The amount of this hydraulic inorganic material is 10% by weight based on the total solid content of the molding material to be prepared.

The hardened body using a hydraulic inorganic material as a binder includes the inorganic hardened body obtained by the present invention, general cement-based building materials such as slate, and the hardened concrete generated during the demolition of buildings. I can do it. This cured product is 1G-5 based on the total solid content of the molding material to be prepared.
Add 0% by weight.

If it is less than 10% by weight, sufficient strength can be obtained without adding a firing process, which does not meet the purpose of the present invention of reusing resources, and if it exceeds 50% by weight, sufficient strength cannot be obtained. It is something that cannot be obtained. Further, this cured product is crushed to a size of 300 μm or less.

If the size exceeds 300 μm, the strength of the final product cannot be ensured.

Aggregates may be added to this hydraulic inorganic material and hardened material. As the aggregates, so-called igneous rock, silica sand, chamotte, sillben, brick powder, anti-flame stone, etc. can be used, and in particular, It is preferable to use a heat-resistant aggregate that does not cause chemical changes or rapid weight and dimensional changes at a temperature lower than the firing temperature when firing the molded product.This aggregate is not particularly limited, but may be a hydraulic inorganic material 100% by weight. 5 for part
It is used in a range of 0 to 200 parts by weight. If the amount of aggregate is less than 50 parts by weight, the molded product may break or crack during the high-temperature firing process, resulting in a decrease in strength.On the other hand, if it exceeds 200 parts by weight, the amount of pine goo will If it becomes too small, there is a risk that the strength will decrease.

Other fibers may be blended, and as these fibers, non-W1 fibers such as asbestos and thorastonite, and organic fibers such as polypropylene and vinylon can be used. Additionally, various additives may be added as desired.

Also, depending on the molding method, a plasticizer may be added. Preferred plasticizers are those that dissolve in water and have a thickening effect, such as methylcellulose, hydroxypropylmethylcellulose, carboxymethylcellulose, and hydroxyethylcellulose.

Water is added to these to prepare a molding material. Water may be added in an amount equal to or greater than that necessary to impart moldability to the molding material within a moldable range and to harden the hydraulic inorganic material, and it is preferable to add as little water as possible.

This molding material is molded according to conventional methods such as pressure molding, extrusion molding, and casting. A pattern can be applied to the surface of the molded product at the same time as molding, or a pattern can be applied secondarily by pressure molding, roll pressing, or the like.

The molded article thus obtained is preliminarily hydrated and cured, if necessary. The degree of curing may be as long as it can be handled.

Next, this molded article is fired at a temperature of 400° C. or higher. The reason why the firing temperature was set at 400°C or higher is because the pulverized product contains ^120. 2 of all hydration products including Fe20s and calcium silicate hydration products.
This is because approximately 0% of retained water is dehydrated, and this dehydrated product is later hardened again by causing a water utilization reaction. If the calcination is performed at a temperature of 700°C or higher, all the moisture retained in the calcium silicate can be dehydrated, so the calcination temperature is preferably 700°C or higher. If fired at temperatures above 1000°C, the cement components will begin to sinter, making hydration hardening difficult, so it is desirable to fire at temperatures below 1000°C.Before firing, do not apply glaze or other paints to the surface of the molded product. It is okay to paint and make up the surface at the same time.

After firing, it is preferable to perform rewater treatment to restore the strength of the molded product. Rewatering treatment can be carried out by conventional methods such as moist heat curing, underwater curing, and autoclave curing.

In this way, a high-strength inorganic cured body is produced at low cost.

Next, examples of the present invention will be shown, but the present invention is not limited to the following examples.

(Example 1) A molding material prepared by mixing and kneading 100 parts by weight of ordinary Portland cement, 20 parts by weight of No. 8 silica sand, 20 parts by weight of asbeth, and 4 parts by weight of methyl cellulose was molded by vacuum extrusion molding. Shape the obtained molded product at 80℃
After heat curing for 7 days, the material was pulverized and passed through a 60-mesh sieve and used as a pulverized hardened product.

Next, 100 parts by weight of this pulverized hardened material, 100 parts by weight of ordinary Portland cement, 20 parts by weight of No. 8 silica sand, 20 parts by weight of asbestos, and 4 parts by weight of methyl cellulose were mixed with water and kneaded to prepare a molding material. did.

Thereafter, the molded product obtained by vacuum forming the molding material was naturally aged for 7 days, then baked at 400°C, allowed to absorb water for 1 day, and then heat cured for 3 days to produce an inorganic cured body.

The bending strength of this inorganic cured body was measured. The results are shown in Table 1.

(Example 2) A molding material was prepared by blending 140 parts by weight of the pulverized hardened body, and an inorganic hardened body was produced in the same manner as in Example 1, except that the firing temperature was 700°C. The bending strength of this product was measured. It is also shown in Table 1.

(Example 3) 501 pieces of crushed hardened material! A cured inorganic body was produced in the same manner as in Example 1, except that a molding material was prepared by blending the following amounts and the firing temperature was 700°C. The bending strength of this material was measured. It is also shown in Table 1.

(Example 4) An inorganic cured body was produced in the same manner as in Example 2, except that a cured body and a molding material were prepared without using methylcellulose, and cast molding was performed. The self-strength of this material was measured. It is also shown in Table 1.

(Example 5) An inorganic cured body was produced in the same manner as in Example 2, except that a cured body and a molding material were prepared without using methylcellulose, and paper molding was performed. The bending strength of this product was measured. It is also shown in Table 1.

(Comparative Example 1) A molding material was prepared by blending 200 parts by weight of the cured product, and inorganic curing was carried out in the same manner as in Example 1, except that the molded product obtained was not baked but subjected to moist heat curing at 80°C for 3 days. manufactured a body. The bending strength of this material was measured. It is also shown in Table 1.

(Comparative Example 2) Il'l was prepared in the same manner as in Comparative Example 1, except that a molding material was prepared without adding a cured product, and a molded product was manufactured by cast molding.
A solid hardened body was produced. The bending strength of this product was measured. It is also shown in Table 1.

(Comparative Example 3) An inorganic cured body was produced in the same manner as in Comparative Example 1, except that a molding material was prepared without adding a cured body, and a molded product was produced by paper forming. The bending strength of this material was measured. 1st
Also shown in the table.

As a result of Table 1, in the examples of the present invention, even if the pulverized hardened material was blended, strength comparable to Comparative Examples 2 and 3 in which the pulverized hardened material was not blended was ensured. It can be seen that the strength does not decrease.

[Effects of the Invention] In the present invention, 10% by weight or more of hydraulic inorganic material and 10 to 50% by weight of a particle size of 300μ based on the total solid content.
A molding material is prepared by adding water and kneading a hardened product that has been crushed to a size of less than m and has a hydraulic inorganic material as a binder, and after shaping this molding material, it is fired at a firing temperature of 400°C or higher. Since it is fired at a temperature of 400°C or higher, it is possible to dehydrate the water contained in the hydration product contained in the crushed product of the hardened product. Therefore, even if this hardened product is used in large quantities, The strength of the obtained inorganic material does not decrease, and as a result, we can effectively utilize the hardened cement products that were conventionally used in landfills or dumped in the mountains to produce high-strength hardened inorganic materials at low cost. can do.

[Brief explanation of the drawing]

The tJs1 diagram is a graph showing the relationship between the blending ratio of the pulverized hardened body and the bending strength of the obtained inorganic hardened body in the conventional art.

Claims (1)

[Claims] (1) Water is added to the total solid content of 10% by weight or more of a hydraulic inorganic material and 10 to 50% by weight of a cured product that has been ground to a particle size of 300 μm or less and has the hydraulic inorganic material as a binder. A method for producing an inorganic cured body, which comprises preparing a molding material, shaping the molding material, and then firing it at a firing temperature of 400° C. or higher.