JPS61168578A - Lightweight foamed concrete board and 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] (Industrial Application Field) The present invention is a lightweight aerated concrete slab using a flat casting method, with the release surface of the bottom plate of the form being used as the product surface, resulting in improved smoothness, design, and water resistance. This invention relates to an excellent lightweight cellular concrete slab and its manufacturing method.

Examples of lightweight aerated concrete include ALC and preformed lightweight aerated concrete plates.

(Prior technology) In the past, there were almost no lightweight aerated concrete plates in which the surface released with a mold release agent was used as the product surface, and the mold release surface was cut off with a cutting line such as piano wire, or it was cut after auto-curing. It was processed and exposed.

This is different from concrete such as PC version, and with lightweight aerated concrete mortar, the strength of the mortar block itself is several times weaker, and when demolding the formwork, the releasability is greatly increased and the mold can be removed without chipping. Also, the mortar viscosity is extremely low, ranging from 300 to 1000 centipoise, and by pouring this mortar, the dispersing agent is flowed away, and the flowed part is
From the viewpoint of quality, it is not recommended to use the mold release surface of the bottom plate of the form as the product surface in lightweight aerated concrete because the peeling of the block or the part where the released mold release agent is deposited will cause the mortar to become unreacted. However, it was also considered not to be an economically sound method.

In addition, some of the relief plates had a mold release surface exposed, but defects due to oil entrainment of the mold release agent were noticeable, and there was peeling of the mortar due to poor mold release. Furthermore, the pattern of the plate obtained was not clear, and the sharp pattern obtained with concrete plates was not obtained. In other words, the surface of the original was not faithfully reflected on the surface of the plate, much like (,) in Figure 2.

(Purpose of the invention) Although the growth of lightweight aerated concrete is remarkable, its use is also expanding into fields with higher design characteristics.
) There is also a growing demand for a version with a sense of depth equal to or greater than the PC version.

The present invention aims to use the mold release surface of the bottom plate of the formwork as the product surface even in lightweight aerated concrete plates, and moreover, that surface has a sharp surface and is intended to produce a product with a sharp sense of solidity. The aim is to supply plates with excellent water resistance. At the same time, we aim to provide a simplified manufacturing process.

(Structure of the Invention) The lightweight aerated concrete slab of the present invention has at least one plate surface of the plate product surface of 2.
The main feature is that it has the original part of the mold release surface of the mold bottom plate shown in . Adjacent parts of this prototype part 2 are on almost straight lines, and y depends on the plane precision of the mold used.

Conventionally, the prototype part indicated by 2 has not been available, and the surface has been forced to resemble that shown in (,) in Fig. 2. This was due to the fact that appropriate mold release agents, coating methods, and injection methods had not yet been developed, and
This is because the need for it was low.

Furthermore, the mold release agent-impregnated layer shown by 5 in FIG. ~500μ). The impregnated layer increases water permeation resistance and improves water resistance. When a film-like mold release agent such as PVA is used, a mold release agent-impregnated layer cannot be obtained. The impregnated layer referred to here can be identified as follows. 1) Identify the layer by the color change of the release agent during auto-curing. 2) Identify the presence or absence of that layer by comparing water permeability. 3) Methods such as identification based on changes in crystals by powder X-ray diffraction.

The manufacturing method of the present invention provides such a novel lightweight cellular concrete slab by applying a mold release agent to the bottom plate of the formwork at a rate of 20 to log/
The feature is that after uniformly applying the mortar, mortar is injected from a mortar injection port close to the bottom plate of the form.

In the present invention, the mold release agent refers to mineral oil, mineral oil containing a surfactant such as metal soap, silicone oil,
It is made by dispersing low-molecular polyethylene in mineral oil, and may contain as additives a chicken tropism imparting agent (charcoal, silica, etc.) and a film-strengthening and retaining agent (polyisobutylene, etc.).

Other than this, there are no particular limitations as long as it can be applied uniformly.

Alternatively, a film-type mold release agent such as polyvinyl alcohol may be used. Due to the cost of mold release agents and the ease of application, metal soap, sulfonate, and polyisobutylene are dispersed in mineral oil that forms a non-drying oil film.
℃ Viscotester) is more preferred.

In addition, the adsorption of molecules such as metal soap molecules and sulfone lid salts in this mold release agent also helps in mold release properties.

Next, as for the method of applying the mold release agent, the mold release agent is applied to a thin film of 20 to 60 μm in a thin film as follows. That is,
The amount of coating per square meter of formwork is set in advance, and the amount is applied to the bottom plate of the formwork by a spray method or a mopping method, and then it is evened out over the entire bottom plate surface with a roller. It is also possible to apply an excess amount of mold release agent in advance than the final required amount and squeeze out the excess release agent in the next roller treatment, but it is better to apply only the required amount in advance with a spray etc. and smooth it out with a roller. is most preferable. A uniform coating film can also be obtained by securing a predetermined amount of the release agent using an intaglio plate or the like, transferring it to a rubber roller as in an offset printing method, and further transferring it to the bottom plate of the mold. Any roller may be used as long as it is oil-resistant and has a soft surface, but rolls with oil retention properties such as mohair rolls, felt rolls, and foamed polyurethane rolls are particularly preferred.

The amount of the release agent applied to the bottom plate of the mold is preferably 20 to 60 g/m2. Among them, 30 to sag/m2 is practically more preferable.

Next, the mortar applied to the formwork bottom plate by the above method is injected by placing the mortar injection port close to the formwork bottom plate as shown in the examples in Figures 3 and 4. The mortar block can be prevented from chipping due to the release agent, and it is possible to manufacture a lightweight cellular concrete slab having a release surface that faithfully mirrors the surface of the bottom plate of the formwork described above. More preferable pouring conditions are to pour along the bottom plate of the mold and to keep the pouring mortar at a gentle flow rate of 82/min.F2 or less at the pouring inlet.

(Example) ALC mortar slurry mortar using aluminum as a foaming agent was prepared into a mold with internal dimensions of 1.8M width x 3. OM length x 0.
When injecting into a 2M height mold using the injector 7 shown in Fig. 3 with the injection port close to the surface of the bottom plate of the mold, the bottom plate of the mold was filled with mineral oil and calcium chloride metal soap. , sulfonate, and polyisobutylene were added in small amounts. A mold release agent (specific gravity 1.1) with a viscosity of 120 seconds (30°C Viscotester),
It was applied with a mop and then smoothed out evenly with a mohair roller. After this, I wiped off the mold release agent and checked the amount of application, which was 40.
g/m2. In addition, the syringe shown in Fig. 3 flows mortar from the mortar supply pipe 14, and the syringe 7 is filled with mortar.
After stocking and removing foreign matter with gilt copper, etc., the bottom plate of the form is injected along the injection guide plate 8. 9Fi is a holding guide to prevent flow from being disturbed. 70 The main body is tightly attached to the bottom plate of the form. The reason why there is no mold is to allow injection even if reinforcing mold exists under the main body of the guide plate 7.The material and shape of the guide plate 8 are rust-resistant and flexible.
It can be held in an S-shape. I used something. In other words, it is made of plastic and molded into a tingling 8 shape.

It may also be made of tin plate with the ends coated with resin. The syringe guide 9 was made of thick vinyl chloride film.

The mortar flow rate at the mortar outlet slit in No. 10 was 6 to 7 minutes/crn2, and the mortar was poured to a height of 96n from the bottom plate of the form.
After foaming the mortar and pre-curing the mortar, the side plates of the form were demolded, the upper surface of the mortar was cut and removed with piano wire, and the mortar blocks were removed from the bottom plate of the form by vacuum suction. Then autoclave cured and 125m
A large thick ALC plate was obtained. The external appearance of the mold release surface shows no bottom peeling, no missing parts, and no curing defects due to oil entrainment, and when the surface part is enlarged 10 times and the cross section is observed, it is shown as 2 in t8) in Figure 1. A plate with a solid appearance similar to a concrete casting plate was obtained, which had a formwork release surface with an original part of the formwork bottom plate. In addition, it was confirmed that the mold release surface had good water resistance as follows. i
The time required for water to be absorbed by dropping CE water onto the plate was measured, and found that it took 10 minutes for the release surface of the bottom plate of the mold, but 1 minute for the cut surface of the piano wire.

In addition, after cutting and removing the mortar on the top surface with piano wire, the bottom plate of the formwork was placed in an autoclave, but the mortar did not adhere to the bottom plate of the formwork, and it had the same good appearance as described above. A version was obtained. The method of curing the entire formwork bottom plate is more preferable because it is less likely to cause damage when the mortar and the formwork bottom plate are separated from each other in the block, and the preliminary curing time can be shortened.

When the syringe shown in FIG. 4 was used and manufactured under the same conditions as described above, a product having a good appearance as described above was obtained.

(Effects of the Invention) According to the present invention, in the lightweight aerated concrete slab, the release surface of the formwork bottom plate is used as the product surface, and the surface faithfully reflects the original shape of the formwork bottom plate, giving it a sharp and solid feel. A new lightweight cellular concrete slab can be obtained, without defects such as poor curing, and if an impregnating oil-based mold release agent is used, it is possible to supply a slab with excellent water resistance.

In addition, cutting processing after autoclave curing, and 1. molding.

It is possible to obtain a manufacturing process for lightweight aerated concrete slabs using an economical flat casting method that does not require cutting, and also provides a manufacturing process for high-quality plates that does not cause damage to the mortar when the form bottom plate is released. can.

[Brief explanation of drawings]

FIG. 1 is an ALC smooth plate according to the present invention, and (a) is
(b) is an enlarged cross-sectional view of a part of the arrowed part cut very thinly and enlarged 10 times. (b) shows the surface condition of a 10α×10(7) plate. a) and (b) show a partially enlarged sectional view of a plate having a conventional mold release surface and its surface condition. Figures 3 and 4 show examples of mortar inlets close to the formwork bottom plate. The arrow in the figure indicates the direction in which mortar flows during injection. 1: Lightweight aerated concrete plate body 2: Flat part of the mold release surface of the bottom plate of the formwork 3: Surface that does not faithfully reflect the original formwork 4: Air bubbles
5: Release agent impregnated layer 6: Depth of recess 7: Injector body 8: Injection guide plate 9: Injector guide 10: Mortar outlet slit 11: Form bottom plate 12: Side plate 13: Hanging tool 14: Mortar supply pipe 15:
Injection guide tube 16: Tip sheet Patent applicant Asahi Kasei Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Procedural amendment (0 March 1985)

Claims (2)

[Claims] (1) A lightweight cellular concrete plate using a flat casting method, which has a mold release surface on the surface of the plate product, and the mold release surface is a mold release surface that faithfully copies the mold bottom plate surface. Concrete version. (2) In the manufacturing method of lightweight aerated concrete slab by flat casting method, 20 to 60 g/m^2 of mold release agent is added to the bottom plate of the form.
A method for producing a lightweight aerated concrete slab, characterized by injecting mortar from a mortar injection port close to the bottom plate of the formwork after uniformly applying it.