JPS6011313A - Manufacture of light aerated concrete - 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] Conventionally, in a method for manufacturing cellular concrete, after stirring a lightweight cellular concrete raw material slurry with a mixer,
During injection into the mold, air bubbles are mixed in, creating rough cavities on the surface and inside of the product, causing problems such as poor appearance. One cause of this was the occurrence of turbulent flow conditions in the passageway during injection where air was present.

In addition, in order to prevent this, it was known that the appearance could be improved by inserting a rod-shaped ζibrator into the formwork and applying vibrational acceleration after the injection was completed, but the time required to apply vibrational acceleration was If it is too long, or if the reaction rate of the blowing agent in the raw material becomes too fast, the generated bubbles will be destroyed, the foaming height will become low, and the specific gravity of the product will become too high.

Therefore, in order to solve this problem, the present invention applies vibrational acceleration to the slurry at the location where turbulence occurs, specifically in the injection pipe or near the injection port, thereby eliminating air bubbles that are about to get mixed in. This is an injection method for immediate removal. It is effective to apply vibrational acceleration to the slurry at a curved point in the piping where turbulence is likely to occur, or at a point where the slurry flows out from the injection pipe into the formwork (referred to as an injection port). The method of applying vibrational acceleration is preferably one using a rod-shaped ζibrator to directly apply acceleration to the slurry, or an indirect method in which a plate or the like is vibrated with an ibrator and the plate applies acceleration to the slurry.

The outstanding features of the present invention are, firstly, that the equipment for applying vibrational acceleration is integrated with the injection equipment, so no new process is required and the equipment itself is simple; secondly, By applying the imaging acceleration before the reaction of the foaming agent starts, the bubbles generated by the foaming agent should not burst at all.
Thirdly, the degassed slurry is applied vibrational acceleration and spreads into the formwork, so the effect is wide-ranging.

Next, the effects of the present invention will be specifically explained with reference to FIG.

The slurry used contained 6 parts by weight of crushed silica stone.
0 parts of quicklime, 10 parts of quicklime, and 30 parts of ordinary moromi lutran r cement were mixed.To 100 parts of rostrum, 70 parts of water was added, and 0.07 parts of a foaming agent was added to the solid form. This slurry is poured into the formwork (4) (i, sm width, 6.0m length, 9.7m) through the injection pipe (3) connected to the mixer (1).
height) from near the bottom of the formwork.

At this time, in the present invention, three nonoibrators (6) were placed under the injection port supported by the support frame (5), and a photographic acceleration was applied during the injection for about 3 minutes. In addition, for comparison, one without using a nonoibrator and one in which vibration acceleration was applied for 60 seconds and 3 minutes after the injection was completed were manufactured. The nono isolator used had a frequency of 12,000 vibrations/MfR1 amplitude of 2×10'' and a vibration acceleration of 5G (actually measured [direct)].

After curing and curing, these slurries were cut at the center in the width direction, the air bubble diameter was measured, and the air bubble inclusion coefficient was calculated. This air bubble mixing coefficient means that the air bubble diameter is 2-
31 or more and less than 31 n/nI, 3-1 or more and 5 and less than 21, 5-
1 or more and less than 7--, north of 7-ra and less than 10-1, 10""
/ln or more and counted, 5.16 and 36 respectively.
, 64, and 100, and indicates the degree of air bubble inclusion.

The results are shown in Table 1.

In addition, the air bubble mixing coefficient distinguishes the area 1 m from the injection inlet to area h, 2mD) and the area after it to area B, and the foaming height is defined as the injection inlet at point C, the point 0.5m away from the injection inlet at point D,
A point 1 m 1 qft-h from the injection port was distinguished from point E.

(Left below) Table Matada soup stock contains air bubbles! The number of threads is rounded off to the negative digit,
Foaming height/soil, decimal place - rounded to the nearest whole number.

From this, it can be seen that the effect of the present invention is very large, that the range of young fruit is still wide, and that the air bubbles generated by the foaming agent are destroyed.
Since there was no L, the foaming height remained unchanged.

Center, Akira 1st row 1 ;';i) Figure 1? Using the injection equipment shown in FIG. A mixture of 27 parts of Siltoned cement, 2 θttli of recovered waste, and 2 parts of stone if 10
70 parts of water was added to 0 parts, and 0.07 parts of a foaming agent was added to each solid material. There were three Ibrators (6) used, each with a frequency of 120.
00 times/-, amplitude 2×1O-sX, historical acceleration 5G (actual measurement value). It takes about 3 minutes for the slurry stirred in the mixer (1) to be poured into the mold (4).
During that time, vibration acceleration was continued to be applied. After the injection is completed, the set injection tube (3) is moved upward via the support column (2) and pulley (8) by the wires (7) and (7'),
The foaming/curing process was made to have no adverse effect. After this product was cured, it was cut at the center in the width direction and the air bubble inclusion coefficient was measured, and a good result of 16 per ml was obtained.

Practical Example 2' Using the injection equipment in which two ibrators (6) are installed in the injection piping (3) shown in Figs. 3 and 4, 45 parts by weight of crushed silica stone as slurry, 6 parts of quicklime, 27 parts of ordinary Portland ment, 20 parts of recovered waste
part, stone 111 [70 parts of water to 100 parts of the mixture of 2 parts]
A foaming agent was added in an amount of 0.07 parts based on the solid material. Two ibrators (6) were used, each with a frequency of 12,000 times/R1 width of 2X.
I (1-3, flying acceleration 5G (actual measurement). The slurry stirred in the mixer is poured into the mold (4) after about 3 minutes, during which time vibration acceleration is continued to be applied. After the injection was completed, the set injection tube (3) was moved upward to prevent it from adversely affecting the foaming and curing process.The product was cut at the center of the width direction after curing, and air bubbles were removed. The coefficient was set to 71111, and a good result of 105 per m2 was obtained.

[Brief explanation of drawings]

Figure 1 is a schematic side view of the mixer, mold, and slurry injection tube/nono crater arrangement applied to the actual vertebrae of the Akira method of the present invention, Figure 2 is its plan view, and Figure 3 is the (ill, A schematic side view of an example of the device, and FIG. 4 is a plan view thereof. (1) Mixer, support column, (3)...
・Injection pipe, (4)...Formwork, (5)...Support frame, (
6)...Rod-shaped vibrator-1 (7n, (7')...
・Wire, (8)...pulley.

Claims (1)

[Claims] A method for producing lightweight cellular concrete, which is characterized in that when pouring a raw material slurry of lightweight cellular concrete into a formwork from a mixer, the slurry is injected while giving a photographic acceleration to the slurry during the route or near the point where the slurry is being poured.