JPS6089305A - Mortar injection method of light-weight 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 producing lightweight cellular concrete, after stirring the @edible cellular concrete raw material slurry with a mixer,
Air bubbles get mixed in during pouring into the mold, creating rough cavities on the surface and inside of the product, causing problems such as poor appearance.

One cause of this is the occurrence of turbulent flow at a location where air is present in the path during injection and the entrainment of air due to this.

In addition, to prevent this, it was known that a rod-shaped vibrator was inserted into the mold after injection was completed, and the ink that applied vibration acceleration improved the appearance, but it was difficult to remove bubbles uniformly over the entire mold. Also, localized heavy mortar could not be avoided. This is particularly the case when the vibration acceleration is applied for too long or when the foaming agent in the raw material partially foams.

Therefore, in the present invention, in order to solve this problem, the mortar slurry passing through the injection port is degassed inside the injection port by vibrating the injection port itself which contains air, and the mortar slurry is transferred from the injection port to the formwork. This is to remove air entrainment at the part where the gas flows through by transmitting vibrations from the inlet device. In the present invention, defoaming includes a phenomenon in which coarse bubbles are destroyed by vibration and become small bubbles.

An excellent feature of the present invention is that the injection port itself is vibrated in the tool 1, so the vibration transmission area is wide (vibration is efficient, and leakage is prevented).
The vibrations are transmitted to the mortar and can be defoamed in the injection port, and rough air bubbles can be efficiently removed from the mortar near the injection port due to the vibration from the injection port. Secondly, the mortar is free of coarse air bubbles at the time of pouring, and since this mortar spreads, the mortar can be uniform throughout the entire pouring mold.

(Partial weighting can be suppressed to a minimum.) In terms of equipment, the fangs 3 may be equipped with a device that vibrates the injection port (a relatively simple device can be used).

Next, the effects of the present invention will be explained in detail with reference to FIG. The mortar slurry used was 60 parts of crushed stone and 1 part of quicklime.
0 parts, ordinary Portland cement) 30 parts mixture 100
0.055 to 0.075 parts of a foaming agent to the solid material and mixed. The mortar viscosity at the time of pouring is about 500 to 750 hours using a Yamazaki rotational viscometer at torque detection temperature. This slurry was injected into the mold (5) from near the bottom of the mold through an injection pipe (2) connected to the mixer (1). The injection pipe has a valve for opening and closing midway. The injection pipe (2) and injection pipe (3) have an open part and are not sealed, and from this part the pie break attached to the injection port (3) - (7)
7 allows defoamed air, etc. of the mortar slurry that remains in the inlet and passes through to escape. Also, by placing a copper pot or the like in this area, it is possible to easily prevent foreign matter from entering the molded product. Regarding the shape of the injection port, it may have a multi-port (6) (also expressed as multi-legged) at the bottom of the injection port as shown in Figures 1 and 2, or it may have a multi-port (6) (also expressed as multi-legged) at the bottom of the injection port as shown in Figures 3 and 4. (The lower part of the injection port (8) is a long and narrow rectangular slit (9)
). In short, it is sufficient to have a structure that is as close to the formwork floor plate as possible and that allows the mortar to flow horizontally to the bottom plate. or,
Since the injection ports (3) and (6) are forced to vibrate by the vibrator (7), it is necessary to avoid a structure in which the resonance is large or the (6) part is damaged.

Further, the injection port is moved up and down by the elevating device (4), and naturally a spring, vibration-proof rubber, etc. are incorporated in this connecting portion. If the mortar injection is completed within 1 minute from the start of the mortar injection, the mortar near the injection port will hardly become heavy, but if the injection takes a long time, the injection port should be closed as the injection level increases. By gradually lifting the liquid upward, it is possible to avoid the area near the injection port becoming heavy.

The vibrator (7) has a vibration acceleration of 10 or more, preferably 5G or more, and a vibration frequency of C1000VPM or more, more preferably 11 when the injection port is filled with mortar.
Any material may be used as long as it can be applied with a frequency of 00OOVP or more. Since the method of applying vibration changes depending on the viscosity of the mortar slurry, etc., a variable speed vibrator is more preferable.

In addition, after hardening and curing, these slurries are cut horizontally at 2,001 m below the top of the block.
The air bubble diameter was measured over the entire length and the air bubble inclusion coefficient was calculated. This air entrainment coefficient is calculated by classifying the air bubble diameter into 3 m or more and less than 51 parts, 511 parts m or more and less than 7 parts, 7 m or more and less than IQm, and 10 parts or more.
,64. This value is multiplied by Zoo and summed, and indicates the degree of the amount of air bubbles mixed in. The larger the amount of air bubbles mixed in, the higher the value.

I showed this result to 1. In addition, the air bubble mixing amount coefficient was classified as kA in the section 11H from the injection port, B in the range from 1 m to 2 m, and C in the further range.

Table 1 However, the air bubble inclusion coefficient was rounded off to the first digit.

Further, the term "difference in absolute dry specific gravity" in Table 1 indicates whether each part becomes heavier due to vibration, and indicates the difference in absolute dry specific gravity when area C is taken as a reference of 100. 110 compared to 100 means that the specific gravity is 10% higher.

From now on, it is clear that the effects of the present invention are very large, that the scope of the effects is wide, and that there is little localized increase in weight.
It was done.

Example 1 Using the injection equipment shown in FIGS. 1 and 2, a mold (5) with internal dimensions of 4M length, 1.8M width, and 0.2M height was used as a slurry, and each part by weight was used as a slurry. Crushed sand stone 4
5 parts, quicklime 6 parts, ordinary Portland cement 27 parts,
7 parts of water to 100 parts of a mixture of 20 parts of recovered waste and 2 parts of gypsum.
In addition, 0.07 part of a foaming agent was added to the solid material.

Two vibrators (7) were used, each having a frequency of 10,000 vibrations/a residual vibration width of 100 μ and a vibration acceleration s G (actually measured value) at the time of injection. It took about 2 minutes for the slurry stirred in the mixer (1) to be poured into the mold (5), during which time vibrations were continued. After the injection was completed, the injection port (3) was moved upward by a hanger so as not to adversely affect the curing process.

After curing, this product was cut horizontally at a height of 150 days from the bottom plate surface of the form, and the air bubble inclusion coefficient was measured at the center of the plate.
A good result of 16 per 2 was obtained.

Example 2 As shown in Fig. 3 and Fig.
) with internal dimensions of 4M length, 1.5M width, and 0.7M height, and slurry containing 45 parts by weight of crushed sandstone, 6 parts quicklime, and 27 parts ordinary Portland cement.
For 100 parts of a mixture of 20 parts of recovered waste and 2 parts of gypsum,
Add 70 parts of water and add 0.07 parts of foaming agent to the solid material.
I used the one with 100% added. Vibrator used (7)
There are two, each with a frequency of 12000@/min at the time of injection,
The amplitude was 100μ, and the vibration acceleration was 5G (actually measured values). It took about 2.5 minutes for the slurry stirred in the mixer (1) to be poured into the mold (10), during which time vibrations were continued. This embodiment has a structure in which copper is attached to the injection port (8) to prevent foreign matter from entering. Also, part (9) at the tip of the injection port has a rectangular slit, and the inside of this rectangular slit (9) is 5cIrL.
The structure is such that the injection slit is divided by pitches, and consideration has been given to increasing the contact area of the injection port with the mortar.

Also, during pouring, the pouring ports (8) and (9) were lifted every 30 seconds so that pouring and vibration were always applied at a position where the pouring slit was close to the mortar liquid level in the mold. After the injection was completed, the set injection ports (8) and (9) were moved upward so as not to affect the foaming and curing process. After curing this product, cut horizontally at a position of 45011111 from the bottom plate of the form,
The air bubble entrainment coefficient was measured and a good result of -48 was obtained.

[Brief explanation of drawings]

Figure 1 shows an apparatus 1t of a mixer, a mold, a slurry injection pipe, and a vibrator, which are used to carry out the method of the present invention.
FIG. 2 is a plan view thereof, FIG. 3 is a schematic side view of another example of the inlet device, and FIG. 4 is a plan view thereof. (1) Mixer (2) Injection pipe (3) Inlet (4) Inlet device (5) M frame (6)
...Inlet tip (multi-port type) (7)...Vibrator (8)...Inlet (9)...Inlet tip (slit type) (10)...Formwork patent Applicant: Asahi Kasei Industries, Ltd. Figure 1 Figure 3

Claims (1)

[Claims] 1 @ A method for pouring mortar into lightweight aerated concrete, which is characterized in that when injecting aerated concrete mortar slurry into a formwork from a mixer, the inlet device itself is vibrated, and the slurry is injected while giving vibration acceleration to the slurry.