JPS59164658A - 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] The present invention relates to a method for producing an inorganic hardened body using a Portland cement-slag based binder.

r Office technology] The inorganic hardened material obtained by curing and curing a kneaded material whose main component is an inorganic binder containing slag blended with Portland cement and a small amount of gypsum as needed is the It has higher strength than the cured product used as a binder. This is because in the hardened material [[1], ettringite viscous crystals are generated in the gaps between the hydrate particles of Portland cement or slag, and these crystals become entangled with each other or with the hydrate particles.

However, ettringite has the disadvantage that it undergoes large dimensional shrinkage because it is easily dehydrated by heating, and on the other hand, it also has large water absorption expansion upon rehydration.

Therefore, a solution to this problem has been desired with a Portland cement-slag based inorganic hardened body.

[Purpose of the invention]

In view of the above circumstances, this invention has been made to
Slag type no IJI! The purpose is to cure and improve the dimensional stability of the body.

[Disclosure of the invention]

According to the findings of the inventors, it is possible to select the Portland cement/slag weight ratio and mixed wood ratio of the kneaded product, and to add a fine inorganic filler with a specific surface area of 10,000oJ/g or more to the kneaded product. If you do this, you will be able to achieve the purpose stated in item 1.

Therefore, in this invention, the main component of the Portland cement rag is an inorganic binder having a weight ratio of 50% or more,
The amount of mixed water is 15 to 3 in terms of weight ratio to the inorganic binder.
In order to obtain an inorganic cured product by curing the kneaded product with a specific surface area of 10.0%,
The gist of the present invention is a method for producing an inorganic cured product, which is characterized by adding at least 0 cd/g of filler. This will be explained in detail below.

As an inorganic binder, Portland cement slag is used as an essential ingredient. These may be formulated in the form of blast furnace cement. In addition, a small amount of gypsum or the like may be added. The weight ratio of slag in the entire inorganic binder is 50% or more. As the amount of slag increases, the gel-like cured product decreases and dimensional shrinkage decreases. When the amount of slag is less than 50%, the pH of the mixed water in the kneaded material becomes high (pH 1.3 or more), and ettringite
(TSH) becomes difficult to generate.

In addition, the specific surface fi' ((Brane value) is 10, O
OOcd/g or more, preferably 20. OOOcd/
Ultrafine inorganic filler of 1.5 g or more is blended. Examples of the material include calcium carbonate (C a COs ). A commonly used inorganic filler whose specific surface area is not so large may also be used, and an organic filler may also be used. The inorganic filler having a specific surface area of In,000c+J/g or more is preferably 3 to 30% based on mTJ of the solid content in the mixed material. This is because if it is less than 3%, the degree of curing will be poor, and if it exceeds 30%, there is a risk of deterioration of other physical properties.

Specific surface area 10. Since the inorganic filler of 000 cJ/g or more is very fine, it can enter the gaps formed between the hardened particles of Portland cement or slag and the ettringite crystals when they are entangled with each other. Then, fill the gap in whole or in part. This makes it possible to prevent dimensional changes in the inorganic hardened body that occur due to dehydration and rehydration of ettringite.

If necessary, other additives are blended, mixing water is added, and the mixture is kneaded. The amount of mixed water is 15 to 30% by weight based on the inorganic binder. If it is less than 15%, the moisture necessary for curing the matrix cannot be obtained. On the other hand, 3
If it exceeds 0%, voids due to moisture evaporation will occur in the cured product,
Significant dimensional shrinkage begins to occur.

When this kneaded material is molded into a desired shape and cured, an inorganic cured product is obtained.

Next, examples will be described together with comparative examples.

25 fi 1% to the inorganic binder in the formulation of Table 1
Add water in the ratio, mix thoroughly, and make a 16cm x 4
Filled into a cm x 4 cm mold and cured at 80°C for 72 hours.
An inorganic cured product was obtained. The Blaine value was determined by the BET method after milling.

(Leaving space below) Table 1 (Part 1) Table 1 (Part 2) After curing described in Section 2, each cured product was heated at 40°C for 24 hours, followed by 6
Determine the dimensional shrinkage rate when drying at 0°C for 24 hours.
It appeared in the picture. As shown in the figure, in each example,
The dimensional shrinkage rate was smaller than that of the comparative example.

〔Effect of the invention〕

This invention utilizes a special inorganic binder such as
The kneaded material with the ratio and water mixing ratio has a specific surface area of 10,000
Since the ultrafine inorganic filler of aJ/g or more is added, the obtained inorganic cured product has high strength and good dimensional stability.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the dimensional shrinkage rates of the inorganic cured bodies obtained in Examples and Comparative Examples. In the figure, the numbers represent the hardened product numbers. Agent: Patent attorney Takehiko Matsumoto - TJ19 city official (voluntary) 1. Display of the case IMftl 5841' Bamboo Permit No. 041109 2, Name of the invention Process for producing inorganic hardened body 3, Person making the amendment Relationship to the case Patent applicant Address 1048 Kadoma, Kadoma City, Osaka Name (583) Matsushita Representative of Denko Co., Ltd. Representative Iku Kobayashi 4, No representative 6, Subject of amendment (Q!1II) 1111/(Contents of amendment regarding No. 5+1-041.109) 7, Contents of amendment (1) Akiso In Book Box 4, Line 5, ``pH 1, 3J is corrected to rpH 13J.'' (2) In Page 4, Line 16 of the specification, ``Cure degree is poor ← 1'' is changed to ``Low effect.'' Correct. 316

Claims (2)

[Claims] (1) In addition to having Portland cement and slag as essential components, the main component is an inorganic binder in which the weight ratio of slag in the whole is 50% or more, and the amount of mixed water is 15 to 30% in weight ratio to the inorganic binder. A method for producing an inorganic cured product, which comprises adding an inorganic filler having a specific surface area of 10,000 c+J/g or more to the kneaded product, in which the inorganic cured product is obtained by curing the kneaded product. (2) The inorganic cured product according to claim 1, wherein the amount of the inorganic filler having a specific surface area of 10.000c+J/g or more is set to be 3 to 30% based on the weight of the solid content. manufacturing method.