JPS59195567A - Vibration defoaming treatment for lightweight foamed concrete manufacture - 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] + Product version of 逢二抛C′-packed concrete (called ALC in Hf), crushed into fine powder, fc 硅抰原ノ, -
1-5 Lime trace] Add water and foaming agent to the 11-type 1q [Material], mix it all with a mixer (・Make it into a raw material slurry, and make it into a raw material slurry.9) After pouring into the mold set by salt reinforcement, it solidifies to a certain half lJJ
' In the fc1 world that is in the % state, the formwork is removed and the heddle diameter is 0.
It is manufactured by cutting a whole gland of 2 to 1.2 mm into a predetermined size and curing it in steam under conditions of high temperature and pressure.

The air bubbles in the product version, which are generated by the hydrogen gas generated by the reaction of aluminum fine powder in the foam packaging agent with water and alkaline components, are minute air bubbles with a box diameter of 2 Trm or less, but when mixed in the mixer. When the base phase and slurry are injected into the formwork, air and hydrogen gas are completely mixed in, creating coarse bubbles with a diameter of 20 or more, which results in poor product appearance and the accompanying pinhole filling process. was occurring.

The power stroke of the present invention was developed to solve this problem.

In other words, 1 bottle is used for the production of foam concrete, with cf2 raw materials, quicklime and l'Bi (water and other fine solid raw materials) and 6 foaming agents added to 1, When vibrating the formwork for mortar slurry with a liquid specific gravity of 2.0 or less and a viscosity of 200 to 2000 pcm, apply vibrations of 0.5 to 30 times the gravitational acceleration to vibrate the mortar slurry or reinforcing bars in the formwork. is a vibration defoaming treatment method that applies vibration acceleration of 25 to 200 times and removes only coarse bubbles with a diameter of 2 cm or more.

In the present invention, the method of vibration that applies the above-mentioned vibration acceleration to the mortar slurry is A) a method in which the formwork is placed on a vibrating table as shown in Fig. 1, and the entire formwork is vibrated. As shown in Figure 2, there are two methods for attaching a vibrator to the formwork: a method that vibrates the formwork like the red frame itself (hereinafter referred to as method A), and B) a method shown in Figure 2. As shown in the figure, there are other methods such as the method of inserting a rod vibrator or a vibrating plate of a bale-type vibrator into the formwork and vibrating only the reinforcing bars and mortar (hereinafter referred to as method B).

Therefore, if the deformation of the formwork is not a problem, method A) is preferable because it improves the efficiency of defoaming and does not cause uneven defoaming, and if the deformation of the formwork is a problem, method B) is preferable.
-Delicious. However, since uneven defoaming is likely to occur in method B), it is better to move the vibrating part in the mortar or to use multiple vibrating parts.

Next, the conditions for vibration are as follows: a) Vibration start: I] - During the period, it is better to vibrate before the start of injection because the vibration is more effective than when the liquid depth is low, so the defoaming effect is higher and the time until foaming starts. It is desirable because it can be obtained for a long time.

Mouth) Vibration frequency, blood and vibration acceleration (1) The higher the frequency is, the smaller the particle size of the solid content, the better the defoaming effect, and if it is too low, the effect will decrease.

JIS standards for compaction of vibrating parts (A8610, A361
Similar to 1), in method (A) where the formwork is vibrated, 30
00 vpm or more is desirable, and for method (B) in which only mortar and reinforcing bars are vibrated, 8000 vpm or more is desirable.

(2) The total swing width is (B) JIS86 for the brush type.
Similar to 10, 0.8 birds or more is desirable.

As a result of conducting experiments by changing the amplitude and frequency, it is determined how many times the vibration acceleration: α (g) is compared to the Ubukata acceleration. The following formula % Formula % Here, it was confirmed that there is an effective range for n: frequency [S”] and a: total amplitude [α].

It should be noted that it is preferable to apply vibration in both vertical and horizontal directions, rather than in one direction.The details will be explained based on the results of experiments.

A liquid ratio type in which water is added to the raw materials mixed at a ratio of 60 kg of sandstone powder with a particle size of 88μ bus 95 or higher, 5 kg of quicklime powder, and 35 parts of Portland cement, and mixed with fine aluminum powder as a foaming agent at a ratio of 659. Width 1 with reinforcing bars set with raw material slurries of various viscosities of 2.0 or less
80CrnX length 420m x depth 18z formwork with depth 9
Injected up to tYn (A).

(B) In both methods, various vibrational accelerations were applied in two cases: from the start of injection and after the completion of injection.

After the test specimen was foamed and solidified, it was cut horizontally at a position 125 mm from the bottom of the formwork using a steel wire with a diameter of 0.8 mm.
When the number of coarse air bubbles on the cut surface of the cured heel was cut by 3 u at high temperature and high pressure, the following results were obtained.

Table IK shows the results of applying vibration for 120 seconds with the vibration frequency set to 0.05 on. In this case, the effect can be obtained if the vibration is 0.5G or more, the vibration acceleration is high in the column, and the degassing effect is in the cylinder a.
If the temperature exceeds 0G, scratches will occur on the surface of the raw material slurry and separation of solids will occur, which is considered undesirable.In addition, the effect of starting vibration was obtained.

The time for applying vibration is viscosity 2000 ft:
When a vibration acceleration of 30 G was applied to the raw material slurry of 100 g and the vibration time before injection was varied, the results shown in Table 2 below were obtained.

Table 2 Therefore, even in the case of high viscosity, where coarse bubbles are difficult to degas,
It is thought that it can be removed by applying high vibration acceleration for a long time.

However, if the time is longer than 300 seconds, even small bubbles generated due to the foaming effect of the foaming agent will be removed, and solid content will separate, which is not preferable. In addition, the raw material slurry liquid specific gravity is 2.0
When the temperature exceeds that level, the problem has changed that solid content separation tends to occur.

In addition, regarding the (B) method of vibrating the mortar or reinforcing bars in the formwork using a rod-like or wall-based large-shake mJ machine in the same way as the method (A) of vibrating the formwork, vibrations with various vibration accelerations were applied. However, the propagation distance of vibration into the mortar was limited and uneven degassing occurred. Therefore, the experimental results regarding the propagation distance are shown in Table 3 below.

Table 3 As shown in Table 3, the propagation distance has little to do with viscosity, but depends on vibration acceleration, which is generally said to be about 10 times the diameter of the rod-shaped vibration root.

Therefore, to eliminate uneven defoaming (=: <l) rod-shaped or wall-type type 1 movement 1. moving the sink 2
) The method of using a single piece of stick-shaped chirui or a large swing M11 that hits the wall, and 3) Those swings] 8'
Tiff! It is better to use one of the methods of transmitting +. ]11- to IJ
Vibration is applied for 120 seconds after transmitting the motion history/Number of bubbles (number of bubbles/rri') Table 4 below for VC
vt boss 0 table 4 vibration frequency 8000 12000 12000 vpr
r blight, 7. Width. , 08 cm , 08 cm
O,12゜n O,24cn+(r-,)
, Eka D Yu 28° 50.3G 96.5°, 9301
d From the start of injection o-0(F=il'nrO(H
About 20056 After completion of injection (24)
(16) (7) (0) From the start of injection 0
0 0 0 approx. 500 196
After completion of injection (36) (ts) (io)
(4) From the start of injection 22 12
7 06θ1ooo,, 330 After completion of injection (52) (32) (26) (
9), 2--m-411,, from the start of injection 52
26 12 6 As shown in Table 4, when the mortar and reinforcing bars in the formwork are vibrated, a degassing effect can be obtained if the vibration is 25 G or more. In addition, the defoaming effect was higher when vibration was applied at the beginning of injection.

In addition, when the viscosity of the raw material slurry is cylindrical, it has been found that, similar to the combination of vibration of the Vi formwork, it is sufficient to add vibration acceleration during the time when the foaming of the foaming agent does not proceed.

Example 1 A raw material-slurry with a specific gravity of 1.6 in which the water content was 70% by weight with respect to the solid content in the weight ratio of fine stone powder 60 with a particle size of 88 μ bath 95% or more, quicklime powder 5, and Portland cement 35 was prepared. After kneading for 2 minutes, the solid content weight ratio is 0.
The slurry with a viscosity of 5ooty m] was prepared by adding aluminum fine powder of 07 and kneading it continuously for 30 seconds.
i's? ID acceleration from the start of pouring into the formwork when pouring to depth Q an 4.5? (nl: M number 450
0 vpm.

] Vibration with an amplitude of 0.05 ci) was applied for 2 minutes.

When the wire strength reached a semi-plastic state of 1.5 Kg/at', the formwork was removed from the mold, and a steel wire with a diameter of 0-871M was cut horizontally at a distance of 125m5 from the bottom of the formwork. Afterwards, it was cured under high pressure in a tube vortex. Then, the cut surface was cut to a thickness of about 3nπ and the number of coarse bubbles with a diameter of 2u or more was measured.
.

The number of m′ parts was 196 when no vibration was applied, but 0 when vibration was applied, which resulted in a high defoaming effect.

LOL mj Example 2 Under the same conditions as Example 1, the formwork was not vibrated except for the addition of photography, but instead of vibrating the formwork, a rod-shaped vibration transmitter was applied to the reinforcing bars in the formwork for 2 minutes from the start of injection, shaking 5w acceleration = 64.3
G (frequency 12000 Vpnl, amplitude o, os v
pm)'s] (From what I learned from the vibration sound, the number of axes of coarse bubbles with a diameter of 2 fat or more was 196 in the case without vibration, but 0 in the case with vibration. It worked.

[Brief explanation of the drawing]

&'/-1 Figure shows the entire formwork being moved by a vibrating table]
11Ii 1st view of Sound Sound Sound Aso, 2nd figure is a side view of the device that vibrates the entire formwork, and 3rd figure is a side view of the device that vibrates the entire formwork. is a side view of a device that vibrates only reinforcing bars and mortar. In the diagram, 1 is a bottle, Frame 2 is reinforcing bar 3, Mortar 4 is a table large vibrator 5, Formwork mounting type vibrator 6 is a mortar insertion type vibrator, Applicant Asahi Kaji Bokume Co., Ltd. No. 1 Figure 2 Figure 3 Procedural amendment (voluntary) June 1981! Kazuo Wakasugi, Commissioner of the Japan Patent Office, 1, Indication of the case, 1981 Patent Application No. 68313
No. 2 Name of the invention Vibration defoaming treatment method in the production of lightweight foamed concrete Column 5 of ``Scope of the Invention'' and ``Detailed Description of the Invention,'' Contents of the Amendment (1) Clarity; . (J Pino j: j +, 'Ill '4'' Ni Nii Upper = J,...) Line 16, 'Product version of, j to'Nihike;
]:, J and I, ・:4 Correct. (Jino times ((Page 41, line 19, 1-Salt muscle) All "reinforcing bars" and corrected.
I corrected him by saying, ``It's a fine powder.'' (ri) Second negative line 20, 1-25 to 200 times” to 11
0 to 200 times,” I’ll say 1,! (overturned) (
36 is the first line, "0.05 spent" is corrected as "0.04 saw". (7) Same H-)! J6 Sada 2,153rd line onwards 41 5th
~7th column, 2nd row l jji4 Il] [tv+)
U, 05 cnl, 0.05 on. Q, 05 Cl7r J respectively f [o, 04 I
Correct it with IJ. (2.) The 7th shell, 2nd line from the bottom, "also" in the first order,
”→11! Correct. (・l)・No. 80ζ5I ÷ 4th column of Table 3 from the 6th row =
2nd line (19 same, ': ↓ also page 9, 12th line, 1 to entry, 4th column = 1 error, 2nd line, "0.08 cm J f [0,
Correct as 03crt J. q's Mr. 4's 44 ij = 6'); 3 lines, [2
8,5 (, iJ gold 1-10.7GJ and ne i'A positive. q [Yes] Same 10th negative A'r Q line, "2sGJ"
・l (, i-1 and correct it. (”' 1LTJijlW l O Tomi 11.1chij
, 9 lines, 10.05 crtt J at 1” 0.0
Correct 4 cm 1 and 1111. The scope of the requirements for 911 is as follows: 1. In the production of foamed concrete, silicic acid raw material raw lime raw material and its minute isomorphic raw material are added with water and a flooding agent with a liquid ratio of 2.0 or less and a viscosity of 2.0 or less. 200-2000]
- Vibrate 49 frames in Kinuta's mortar slurry.・Proportionality is -Xl-Force speed of 0.5 to 30 -1 When the mortar slurry in the formwork is 5 or 0 or when the reinforcing steel is vibrated (-1 (3-2) It is characterized by adding the transmission acceleration of 4.

Claims (1)

[Claims] 11τ silica raw material in the production of foamed concrete,
The liquid specific gravity is 2.0 or less and the viscosity is 200 to 2000, which is obtained by cooling Oishi member raw materials and other fine solid raw materials with water and a blowing agent.
Add the frame to the mortar slurry of the t-on (2).
If the vibration acceleration is 15 to 30 times the gravitational velocity, or 25 to 200 times the mortar slurry in the frame circle or 25 to 200 times the reinforcing steel when vibrating. Vibration defoaming treatment method used in the production of foamed concrete