JP2619932B2 - Manufacturing method of inorganic products - Google Patents

Description

The present invention relates to a method for producing an inorganic product.

[Conventional technology]

Conventionally, various attempts have been made to use these hydraulic properties as raw materials for inorganic products in order to effectively utilize blast furnace slag that is discharged in large quantities.

[Problems of the prior art]

However, when the granulated blast furnace slag is used in a large amount, the strength development of the shaped body is delayed, a long curing period is required to reach the required strength, and there is a disadvantage that productivity is poor.

Of course, it is conceivable to add Portland cement or the like to the granulated blast furnace slag to increase the bonding strength of the matrix.However, when the shaped body obtained from these raw materials is subjected to high-temperature and high-pressure steam curing, for example, the granulated blast furnace slag is The reaction of the aluminum oxide component contained therein hindered the development of the strength of the cement matrix, and there was a drawback that the strength could not be achieved as expected.

[Problems to be solved by the invention]

In view of the above drawbacks, the present invention aims to effectively utilize granulated blast furnace slag discharged in large quantities and to produce an inorganic product that can be expected to exhibit sufficient strength early and sufficiently even when subjected to high-temperature and high-pressure steam curing by an autoclave. It is intended to provide a method.

[Technology that solved the problem]

That is, the method for producing an inorganic product of the present invention is 40% by weight or less.
70% by weight of granulated blast furnace slag, 5 to 10% by weight of Portland cement, and 5 to 10% by weight of early-strength cement and 5%
A required amount of reinforcing fiber and lightweight aggregate is added to a hydraulic matrix raw material composed of ~ 10% by weight of silica fume, and a molded body is formed from a mixed raw material of these blends, followed by steam curing. It is.

[Action]

In the present invention, granulated blast furnace slag is used as a main component of an inorganic product.

Although this granulated blast furnace slag has a certain degree of hydraulicity, it cannot be made practically strong as described above.

So, add early strength cement and silica fume,
These are made to act additively to increase the strength of the inorganic compound mainly composed of granulated blast furnace slag and shorten the curing period.

40% by weight of granulated blast furnace slag
If the content is less than 40% by weight, the purpose of the present invention is not achieved if the content is less than 40% by weight, and the purpose of effectively utilizing industrial waste is not achieved. If the content is more than 70% by weight, This is because a sufficient strength cannot be obtained even if a cement component and a silica component described below are added.

Portland cement acts as a forming aid for the granulated blast furnace slag and serves as a binder for the granulated blast furnace slag.

Therefore, if the addition amount is less than 5% by weight, a sufficient bonding force cannot be obtained. If the addition amount is more than 10% by weight, the bonding strength increases but the required strength corresponding to the addition amount cannot be obtained. This is uneconomical.

The reason why the amount of the early-strength cement is set to 5% by weight to 10% by weight is that if the amount is less than 5% by weight, the bonding strength of Portland cement as a binder cannot be sufficiently increased and 10% by weight.
This is because even if the amount is increased, the strength development corresponding to the added amount cannot be obtained, which is uneconomical.

The reason why the addition amount of silica fume is set to 5% by weight to 10% by weight is that if it is less than 5% by weight, the additive effect with the above-mentioned high-strength cement is not exhibited, and even if it is more than 10% by weight, it is added. This is because it is not economical because the effect on the amount cannot be improved.

In addition, as the reinforcing fiber, any material such as pulp fiber and synthetic fiber can be used, and can be added within a range that does not adversely affect the bonding strength of the cement matrix.

Perlite or artificial lightweight aggregate can be used as the lightweight aggregate, and the addition amount thereof can be arbitrarily determined in the same manner as described above.

The above blend is mixed, and the product is molded and cured by any molding means, for example, a dry method, a papermaking method, a casting method, and in this case, the granulated blast furnace slag is mainly used even when cured at a high temperature of 60 ° C or more. Regardless of the components, the reaction mechanism is unknown, but sufficient bond strength is exhibited, and the required strength can be obtained by curing for about 24 hours.

〔Example〕

 Next, an embodiment of the present invention will be described.

The raw materials were adjusted according to the composition shown in Table 1, and the raw materials were dry-mixed. Then, the raw materials were supplied in layers on a forming belt, and a test plate having a thickness of 5 mm, a length of 45 cm, and a width of 90 cm was obtained by a conventional dry manufacturing method. Molded in large numbers and cured at high temperature under the curing conditions shown in the right column of Table 1.
When a bending strength test was performed on the obtained molded plate, the results shown in the rightmost column of Table 1 were obtained.

[Effect] As described above, the present invention does not know the reaction mechanism, but due to the surplus effect of the early-strength cement and the silica fume, the molded product of the granulated blast furnace granulated slag, which has been considered unsuitable in the past, This enabled high-temperature curing and early onset of strength, making practical and effective use of industrial waste possible.

Claims (1)

(57) [Claims] 1. A granulated blast furnace slag of 40% to 70% by weight,
A necessary amount of reinforcing fiber and lightweight aggregate is added to a hydraulic matrix raw material comprising 5 to 10% by weight of Portland cement, 5 to 10% by weight of early-strength cement and 5 to 10% by weight of silica fume. A method for producing an inorganic product, comprising forming a molded body from a mixed raw material of materials and performing steam curing.