JPS6144749A - 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.

(Background technology) In order to increase the strength of cement and concrete, it is currently common practice to lower the water mixing ratio and add fluidity to concrete by adding water reducers, etc. There is.

However, when considering the so-called dry type 1 method in which molding is performed at a low water mixing ratio, the use of water reducing agents is limited. Therefore, in press molding, roll extrusion molding, etc., the degree of filling cannot be sufficiently increased due to the shape or size of the cement particles used, and therefore, it is not possible to increase the particle size. This dry method 1 is extremely important from the viewpoint of productivity or production efficiency of industrial secondary products.

On the other hand, a method has also been proposed in which the particle size distribution of cement is taken into account, so that the particle size distributions do not overlap, and a synthetic resin is added to the cement to give it viscosity and high strength is obtained by extrusion, etc. It is difficult to process the cement so that the particle size distributions do not overlap, and it is considered that it takes a lot of effort to classify the cement. In addition, as for the method of adding viscosity to extruded sheets to make them hard and strong, there are many cases in which a certain amount of synthetic resin is added, and as a result, nonflammable inorganic materials It can damage your sexuality.

(Object of the Invention) The present invention was proposed to improve the above-mentioned drawbacks, and includes a dry method 1 (roll extrusion method or self-propelled extrusion method) in the production of an inorganic cured product.

The purpose is to scale a high-strength cured product using a press method, etc.).

(Disclosure of the Invention) The present invention aims to increase the degree of filling (reducing voids in the inorganic hardened material) when using the dry method 1 in the production method of an inorganic hardened material, and to reduce heat generation and shrinkage during cement hardening. The present invention relates to a technology that achieves high strength by preventing a decrease in strength due to fine cracks caused by stress and by preventing the occurrence of cracks due to moisture drying.

This will be explained in detail next.

As the cement material, a hydraulic substance such as ordinary Portland cement or blast furnace slag is used.

The filler is a commonly used filler such as silica sand or cacos, and the fine filler preferably has a particle size of 10 μm or less, and more preferably a reactive filler. For example, diatomaceous earth, microsilica, etc. In addition, fine grain cement is made with a particle size of 10 μm or less, and the reactivity is determined by the starting time and
One hour or more is better.

Portland cement, slag is usually 3000 d/7
It has a Blaine value of about 20 μm, an average particle size of about 20 μm,
A material having a wide distribution from about 00 μm to about lpm is used. With such a particle size, large voids remain between the cement particles. In order to fill this void, the particle size is 10 μm.
Fill with the following fine cement or fine filler.

The amount of fine cement or filler used is preferably 5% by weight or more and 5% by weight or less of the total weight. Usage amount is 5f
If the amount is less than 1, large voids will remain, whereas if it is more than 40% by weight, the amount of fine particles will increase too much and voids will remain.

Moreover, if the particle size is 10 μm or more, the voids cannot be filled.

Preferably, the thickness is 5 μm or less.

When cement hardens, it generates heat and shrinks, generating stress. When curing a highly filled molded body, if all of the cement reacts at the same time, the cement will not remain in that state until it hardens when pressure is applied with a press, etc., and fine racks will form, resulting in a decrease in strength. It is an invitation.

Therefore, it is important to combine cements with different reactivities.
This prevents the above phenomenon.

In this case, the mixing ratio of fast-reacting cement and slow-reacting cement is as follows:
5010 is preferred. In this case, if the aggregate weight of highly reactive cement increases by ↓9, there is a risk of cracking.
If the weight is less than 1,000 yen, the reactivity is slow and it takes a long time to develop sufficient strength.

Highly filled fcoJ! In cement, a large amount of stress is generated due to drying, and with cement alone, it is difficult to disperse stress and cracks occur. Therefore, some filler is added. The amount of filler added is 15% by weight or more, 501% by weight.
The following are preferred.

If it is less than 15% by weight, cracks cannot be prevented,
Moreover, if the amount exceeds 50M, the strength will decrease.

There are no particular restrictions on the water mixing ratio, but the lower the water ratio, the higher the density.

High strength. The amount of water is preferably % or less by weight based on the solid content.

Molding is performed using a press, roll extrusion, etc.

There are no particular restrictions on curing or drying.

Next, examples and comparative examples will be described.

(Example) In Examples 1 to 5 and Comparative Examples 1 to 6, ordinary Portland cement (Blaine value 3100) was used as the cement.
, blast furnace slag (Blaine value 3200).

Arrowfix DU (particle size 10 μm or less, Blaine value 8820), micro silica as filler (average particle size 0.1 μm), No. 8 silica sand (average particle size (capital) ~8 μm)
The ingredients were blended in weight percent as shown in Table 1, mixed in a mixer, molded at a press pressure of 200 kg/d, preheated for 6 hours, cured at 0°C for 100 hours, and then dried at 0°C for 24 hours. It was commercialized.

Next, the bulk density and bending strength of this product were measured. The music was played using an autograph made by Takasugi, with a span of 10 cIn and head speed of 0.5 trw' minutes. The results are shown in Table 2.

Looking at the test results shown in Table 2 and above, it is recognized that the products produced by the method of the present invention are superior to conventional products, especially in terms of bending strength.

(Effect of the invention) As described in the paper, the present invention uses fine grain cement with a particle size of 10 μm or less as a part of the cement, and also uses a slow-reactive cement and a fast-reactive cement, and in this case, the ratio of the two is and filler is added to this, the amount of filler added is in the range of 15% to 50% by weight, part of the filler is fine filler with a particle size of 10 μm or less, and the amount is equal to the total amount. L5 has the effect of producing a high-strength inorganic cured product by producing a blend of 5% to 40% by weight at a low water mixing ratio.

Claims (1)

[Claims] Fine grain cement with a particle size of 10 μm or less is used as a part of the cement, and a slow-reactive cement and a fast-reactive cement are used together, and in this case, the ratio of the two is determined by the reactivity by weight. slow cement/fast reactivity cement = 50/
50 to 90/10, and filler is added to this, the amount of filler added is in the range of 15 weight % to 50 weight %, part of the filler is fine filler with a particle size of 10 μm or less, and the amount is The formulation is 5% to 40% by weight,
A method for producing an inorganic cured product characterized by producing it at a low water mixing ratio.