JPS6028787B2 - Method of manufacturing cellular concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing aerated concrete made from cement, water, a protein foaming agent, and a cationic surfactant, and its purpose is to produce a lightweight and high-strength material for construction and civil engineering. It's about getting.

Currently, most aerated concrete is produced by foaming aluminum powder in a slurry and then curing it in an autoclave. Although this method is very effective in producing uniform products in large quantities, it has the disadvantage that it is not suitable for on-site construction. In addition, in the expanded styrene construction method used for on-site construction, the polystyrene interposed inside cannot be expected to have the strength as an aggregate, and if an attempt is made to reduce the weight, the flame resistance will be insufficient.

Furthermore, because expanded polystyrene is expensive, it can only be applied to limited fields such as architecture and wood. At present, there is no material that is lightweight, flame-resistant, and easy to construct on-site. The present inventor focused on a protein foaming agent that does not require autoclave curing as a foaming agent, and succeeded in strengthening the foam film as a method of increasing the strength of cellular concrete.

Generally, surfactants have foaming properties.

This is due to an abnormal decrease in interfacial tension and unique adsorption at the interface, but foams caused by surfactants tend to be difficult to disappear when protein-based substances are added, and furthermore, foams created by protein-based blowing agents tend to be difficult to disappear. They found that not only did the bubbles not disappear due to the surfactant, but the film was actually strengthened. On the other hand, cement particles are negatively charged in water before hardening, and among surfactants, cationic surfactants have a high cohesive force.

Based on this series of knowledge, the present inventor has discovered that the foam generated from the cationic surfactant and the protein foaming agent has excellent adsorption at the interface, causes cement particles to aggregate into a foam film, and forms a dense layer near the foam film. It was confirmed that the foam was further strengthened. Aerated cement slurry made by combining a protein foaming agent, cationic surfactant, cement, and water can be easily applied on-site.
It also has the advantage that curing is sufficient just by covering it with a vinyl sheet and adding moisture, and if it is applied around reinforcing bars that have high strength by themselves, they will become even stronger.

Preferred among the cationic surfactants used are quaternary ammonium salts, whose alkyl groups, .
It is even better if it is between C, 5 and C, . Below C.5, the quality of the foam becomes coarse, and above C.5, the foaming power at low temperatures weakens.

The protein foaming agent used in cellular concrete has a weight ratio of 0.1% to 1%, especially 0.3%.
to 0.5% produces good results.

Further, the amount of the cationic surfactant used is such that the weight ratio to the protein foaming agent is 0.1% to 5%. The particularly preferable range varies depending on which of bending strength, compressive strength, or specific gravity is more important.
5 to 2% is good, and if you want to emphasize compressive strength and specific gravity, 2% to 5% is good.

When the amount of cationic surfactant is less than 0.1%, no significant increase in bending strength and compressive strength is observed, and when it is more than 5%, cement particles aggregate in the foam film so much that the foam disappears, resulting in a decrease in density and light weight. It is no longer possible to expect change.

As for the production method of aerated concrete, the foaming machine used, the raw material input force method, and the order of input are important.
For example, the Takaazusa machine rotates at high speed to increase the amount of foam, and there are many points to be careful about when adding cement, such as adding a constant amount in small portions to prevent clumping.

The following three methods are effective for producing foamed cement slurry, and method (1) is particularly preferred. ■ Mix water, a protein foaming agent, and a cationic surfactant to create foam using a foaming machine, and then inject this foam into a cement slurry consisting of water and cement to create a foamed cement slurry. .

■ Mix water, proteinaceous foaming agent, and cationic surfactant,
Foam is created by forming a false frame, and the foam is poured into a cement slurry consisting of water and cement to form a foamed cement slurry.

■ Mix water, protein foaming agent, and cationic surfactant,
Foam is created by stirring, and cement powder is mixed into the foam little by little, and foamed cement slurry is made by stirring.

Examples of the present invention are shown below.

EXAMPLE Esocard C-12 (manufactured by Lion Oil Co., Ltd.) was used as a cationic surfactant, and Marcrete P liquid (manufactured by Marl Corporation, USA) was used as a protein foaming agent.

A foamed mixed aqueous solution was prepared by adding 3 parts by weight of Marcrete P liquid to 3 parts by weight of Marcrete P liquid and diluting it with water to make 60 parts by weight of Esocard C-12, based on 100 parts by weight of Bortland Cement. Aerated concrete plates were made by adding

Table 1 shows a comparison of the strengths of the plates. The results show that the products containing Esocard C-12 have an increase in bending strength and compressive strength compared to those without Esocard C-12, and the bending strength is 0.
It reached a peak at 0.3 parts, and the compressive strength continued to increase.

Table 1 (note) Song Lena Female Kenpaku Fist Compression specific strength = whip bonito

[Brief explanation of the drawing]

The drawings show the Esocard C-1 in the above embodiment of the present invention.
2 is a graph showing the relationship between the amount added to the foaming agent No. 2 and the strength.

Claims (1)

[Claims] 1. A method for producing aerated concrete using cement, water and a proteinaceous foaming agent, characterized in that a cationic surfactant is mixed in the proteinaceous foaming agent in an amount of 0.1 to 5% by weight. Manufacturing method.