JPS60221356A - 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 cured body used for inorganic building materials.

High-strength concrete has been proposed by mixing cement (for example, Portland cement, etc.) and filler (aggregate, etc.) and molding it at a low water mixing ratio using a water reducing agent. only increases, but the specific strength (the relationship between bulk density and strength) does not increase. Further, the above-mentioned method is performed by a casting method, and is not suitable for factory production such as secondary cement products.

(Objective of the Invention) The present invention was proposed to improve the above-mentioned drawbacks.
By mixing the 10□ component and the OaO component, molding by extrusion or pressing at a low water mixing ratio, curing and drying, the product has a relatively high The purpose is to provide an inorganic cured product with high strength.

(Disclosure of the Invention) The method of the present invention involves mixing an inorganic binder with a low water mixing ratio in 1. It is characterized by hardening, curing, and hardening using a pressing method.

The inorganic binder used in this invention is composed of a silica component having a pozzolanic reaction, such as silicon dust or diatomaceous earth generated during the smelting of silicon steel, and a CaO component, and the mixing ratio is 100% of the silica component (S102 component). ] The amount of CaO component is 20 to 100 parts by weight based on i part.

(The CaO component may be either slaked lime or quicklime.) In addition, the particle size of OaO is 100 μm or less, preferably 50 μm or less.
Pm or less. If the mixing ratio is less than 2 parts by weight of the CaO component per 100 parts by weight of the S102 component, the specific strength due to the small amount of hydraulic components cannot be obtained. Further, if the CaO component is 100 parts by weight or more, a large amount of the CaO component remains, which adversely affects the physical properties of the cured product. Further, if particles with a particle size larger than 100 μm are present, large voids are likely to be formed in the grain, which leads to a decrease in the strength of the cured product.

The mixing ratio of water to solid content is 30 parts by weight or less, preferably 10 to 25 parts by weight. If it exceeds 30 parts by weight,
The remaining moisture forms voids in the cured product, which hinders molding. The mixture may be sufficiently mixed.

Molding is done by extrusion, pressing, etc. Also, curing is 50°
C or higher, preferably 60 C or higher for 3 days or more.

At room temperature, the pozzolan reaction takes too long, so
Steam curing at temperatures below 00°C is preferred. Drying is best when free water evaporates. Next, an example will be described.

The mixing ratio of the silica component and CaO component and the mixing ratio of water are
This is the front page. For mixing, the powders are mixed in a coffee mill for 1 minute. Next, add the appropriate amount of water, mix for 5 minutes, and use a mold at a molding pressure of 150-200 Kp/
, 2, size 20 wb x 150 wrb, thickness 1
A sample of 011 was prepared, cured at 60°C for one week, and then dried at 60°C for 24 hours.

Using an autograph (manufactured by Takashi), the sample observed in this way was measured with a span of 10 crn and a head speed of 0.51.
The bending strength was measured. The specific gravity was also measured and the results are shown in Table 2.

Table 2 The relationship between bending strength and density is shown in Figure 1. The comparative example in the figure is the data of a mixture made with Portland cement and silica aggregate at a hot water ratio of 0.20 to 0.30.

Next, other embodiments will be described.

In this example, a silica component with a pozzolanic reaction, C
In addition to the aO component, fillers such as silica sand and calcium carbonate are added to further improve the specific strength. The fillers to be added include silica components and Ca
10 to 5 parts per 100 parts by weight of solids including O component
0 parts by weight, particle size is 100 μm or less, preferably 50 μm
Add silica sand or calcium carbonate.

If the amount added is less than 10 parts by weight, there is no effect, and if it is more than 50 parts by weight, no improvement in physical properties is observed, and in some cases, a decrease in physical properties is caused. Moreover, if there are many particles with a particle size of 100 μm or more, large voids are likely to be formed around them, leading to a decrease in the strength of the cured product.

Addition of this non-reactive filler brings about the following effects. If only the silica component and CaO component are combined, the cured product will dry out and absorb water, causing changes over time.
A fine rack is generated.

Adding filler has the effect of preventing this. Furthermore, it is also possible to add fiber to the above system.

Table 3 shows the mixing proportions. Table 4 shows its properties.

The relationship between density and bending strength is illustrated in Figure 2. In FIG. 2, the comparative example shows the characteristics of a composite made of Portland cement + aggregate Kui 2-system (silica filler, silica sand) with a water mixing ratio of 0.20 to 0.30.

(Effects of the Invention) As mentioned above, according to the present invention, an inorganic cured body with high specific strength can be easily manufactured.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 each show the characteristics of the inorganic cured product produced according to the present invention. 11 patents Matsushita Electric Works Co., Ltd. Fig. 1 1.0 1.5 2.0 Kashiyaku, l (g/cm3) Fig. 2 Heat & ((If/Cm3)

Claims (2)

[Claims] (1) 20 to 100 parts by weight of the OaO component is added to 100 parts by weight of the silica component having a pozzolanic reaction, and 30 parts by weight or less of water is added to the entire solid content, followed by mixing, molding, and curing. , a method for producing an inorganic cured product characterized by drying. (2) Solid content including silica component and OaO component 100
Particle size of 10 to 50 parts by weight is 100 μm
The method for producing an inorganic cured product according to claim 1, wherein a filler such as silica sand or calcium carbonate preferably having a diameter of 50 μm or less is added, mixed, molded, cured, and dried.