JPS61134202A - Manufacture of lightweight aerated concrete panel - 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 (Field of Industrial Application) The present invention relates to a method for producing a lightweight aerated concrete panel consisting of two layers: a dense layer and a lightweight layer. The present invention relates to a method for manufacturing lightweight aerated concrete panels consisting of two layers: a dense layer and a lightweight layer, which are cured in an autoclave.

(Conventional technology and its problems) Lightweight aerated concrete panels have excellent heat insulation and fire resistance,
Because it is lightweight and has excellent workability, it is widely used as an exterior wall material for buildings. However, it has the disadvantage that it is brittle and easily chipped, and its toughness is low, and when the panel is erected, it comes into contact with scaffolding and steel frames, causing the ends to be easily chipped. In addition, as shown in Part 1 @ IK, sealing and waterproofing should be performed between adjacent panels after the panels are erected, or if the exterior material construction is incomplete because the panel material is foam, which is more permeable than high-density concrete. There is a possibility that rainwater may leak from the incomplete 3° part of the exterior material construction through the panel edge part axis (where the sealant is bonded) to the edge part (Φ) on the indoor side from the sealant bond.

In order to compensate for the shortcomings of lightweight aerated concrete, such as the panel edges being prone to chipping and the sealing part being incompletely watertight, a high-strength, dense cement mortar layer is added to the surface or edge of the @keikai foam concrete. The idea of attaching a material has been known for a long time. (Actual Opening 51-58
No. 29, JP 5431434, JP 55-12198
(Refer to No. 0) Such a two-layer lightweight cellular concrete panel is manufactured by the method shown below.

(1) A method of bonding and integrating a cement mortar plate onto the surface of lightweight aerated concrete using an adhesive or the like.

(2) First, a cement mortar plate is manufactured, and this
In this method, a layer of lightweight aerated concrete is poured into the M-frame.

However, with these methods, there was a risk that the bond between the cement mortar layer and the lightweight cellular concrete layer would become a cold joint, resulting in insufficient adhesion.

In addition, conventional two-layer lightweight cellular concrete plates are easy to manufacture, and in order to obtain a high-strength, high-density surface adhesion layer, the raw materials for the cement mortar layer are different from those for the lightweight cellular concrete layer. In the production method (2) above, when curing with high-temperature, high-pressure steam in an autoclave, there is a problem of delamination due to the difference in thermal expansion coefficient between the cement mortar layer and the lightweight cellular concrete layer due to poor adhesion. becomes. Further, according to the above-mentioned method, there was a risk of cracking and peeling between the eyebrows due to the difference in coefficient of thermal expansion between the two layers after construction.

Furthermore, Japanese Patent Laid-Open No. 57-3774 discloses a method in which mortar for a light layer is first injected into the bottom of the mold, and after the mortar begins to set, a mortar for a dense layer is cast to improve adhesion. However, this method also has the following problems.

(1) Mortar for the dense layer, which has a large specific gravity, is placed on top of the mortar for the light layer, so if the mortar for the light layer is not sufficiently set, the mortar for the dense layer will settle, resulting in a uniform dense layer. No layer is formed. Therefore, it is necessary to set the mortar appropriately, and it is impossible to pour the mortar into a slurry before it starts setting, which causes problems in manufacturing productivity.

(2) In addition, in order to cut to the specified thickness, the upper part of the formwork is generally cut, so the hard layer mortar must be cut, and cutting with piano wire is not possible. There is.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned problems in two-layer lightweight cellular concrete, and includes: (1) manufacturing a lightweight cellular concrete panel consisting of two layers: a dense layer and a lightweight layer; To do this, after pouring all the specified amount of solid layer mortar into the formwork,
A method for manufacturing a lightweight aerated concrete panel, characterized in that mortar for a mass layer is injected while the mortar for a dense layer is not hardened. By doing so, and (2) injecting the mortar for the lightweight layer from the center of the formwork, it became possible to create a more uniform dense layer on the surface, which solved the above-mentioned problems. It is something.

It is preferable that the mortar for the solid layer and the mortar for the light layer have substantially the same raw material composition in terms of adhesiveness between the two layers. Further, even if the slurry is not cured, especially before it starts setting, according to the present method, it is poured into the solid layer mortar, so the above-mentioned problems do not occur.

(Example) The following will explain based on the illustrated example. The Kz diagram shows a cross-sectional view of a light foam concrete panel manufactured according to the present invention, where 4 represents a solid layer portion, 5 represents a glazed skin portion, and 6 represents a reinforcing reinforcing bar. As for the method of manufacturing this panel, first, mortar containing powdered silicic acid raw material and calcareous raw material for the solid layer as main raw materials is cast on the bottom plate of the form to a thickness of 10 to 50 m.

The composition of raw materials is: quicklime = 5 to 15 parts by weight, cement) = 3
0-40]i parts, sand stone = 40-60 parts by weight, total 10
The ratio is 20.about.80 parts by weight of water to 0 parts by weight.

A water reducing agent may be used as appropriate. Also, if necessary,
Natural fibers such as cotton linters, recycled fibers such as benbelub and rayon, inorganic fibers such as carbon fibers and glass fibers, and mineral fibers such as wollastonite, mica, and asbestos, at a volume mixing rate of O, S to 20 cm. It may be mixed in to further improve the impact resistance of the surface layer. This portion forms the dense layer portion 4. Next, after this, a mortar for the light layer, which is obtained by adding a foaming agent to the mortar, is cast and poured while the mortar for the solid layer that has been cast is not yet hardened. FIG. 4 shows the preferred location for placing the mortar for the IOK lightweight layer. It is preferable to pour the mold at a position that is at least 1/4L away from the side frame 9 in the longitudinal direction (L) of the formwork, and at a position that is at least W or more away from the side frame 9 in the width direction (W) of the formwork.

This portion forms a 5ft lightweight layer portion. When the lightweight layer portion 50 is cast in the above-mentioned position, the thickness of the dense layer portion 4 having a uniform thickness is such that the mortar in the center of the panel extends toward the edge of the panel, as shown in FIG. Because it is pushed away, it becomes smaller at the center of the panel and larger at the edges of the panel.

In this process, forming the thick solid portion 4 at the end of the panel to a large thickness prevents the end of the panel from coming into contact with the scaffolding or steel frame during erection and chipping, and also prevents the end of the panel from coming into contact with the scaffolding or steel frame during erection, and also prevents the panel from coming into contact with the scaffolding or steel frame during erection. It is very effective in ensuring watertight performance by making the material into a dense part with small water permeability, and also in terms of adhesiveness and uniform density. In addition, since the solid part is cast and poured into the formwork first, the compaction of the solid part is sufficient, and the block can be easily cut using piano wire, a knife, etc. since the part is lightweight. I can do it,
0 is preferable since it does not require trowel finishing. After pouring the mortar for the lightweight layer in this way, the side frame 9 is removed from the mold when it reaches an appropriate hardness.
The upper surface of the lightweight mortar layer is cut to a predetermined size and cured in an autoclave.

FIG. 3 is an enlarged view of the interface between the dense layer portion 4 and the light layer portion 5 indicated by C in FIG. 2. 7 represents a bubble, 8 represents a matrix portion, and 4 represents a dense layer portion.

Here, if the matrix part 8 and the dense layer part 4 have the same composition, their coefficients of thermal expansion (7X 1G-') are the same, and when they are cured in an autoclave or cured in high-temperature, high-pressure steam, the difference in their coefficient of thermal expansion is Therefore, the problem of peeling between the dense layer portion 4 and the light layer portion 5 does not occur, and even after the panel is constructed, there is no fear of cracking or delamination due to the difference in coefficient of thermal expansion between the two.

In addition, if the sea urchin dense layer portion 4 and the lightweight layer portion 5 are formed by blending the same raw materials, the raw material blending equipment may be the same as the manufacturing equipment for ordinary lightweight foam concrete panels,
The production line is simple and equipment costs are low.

(Effects of the Invention) As described above, the present invention & CL has the following advantages.

(1) The solid layer part and the light layer part are perfectly integrated 0 (2) The solid layer part at the edge of the panel can be made thick, and the solid layer part in the center can be made thin, allowing for rational reinforcement. becomes.

As described above, according to the present invention, it is possible to obtain an architectural exterior wall material with excellent impact resistance and watertightness, in which the dense layer portion on the surface is completely integrated with the light layer portion with high heat insulation properties, and the manufacturing equipment, The manufacturing process is also simple.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an ingress route of rainwater. FIG. 2 is a cross-sectional view of a panel according to the invention. FIG. 3 is an enlarged sectional view of the dense layer portion and the light layer portion indicated by C in FIG. 2. Figure 4 is an explanatory diagram showing the mortar injection part01...--Lightweight aerated concrete panel2...
...Rainwater intrusion route 3...Exterior material 3'...-Incomplete part of exterior material construction 4...-Dense layer portion 5...-Light layer portion 6... ... Reinforcement reinforcing bars 7 ... Air bubbles 8 ... Matrix portion 9 ... Formwork side frame 10 ... Mortar injection portion Patent applicant Asahi Kasei Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) When manufacturing a lightweight aerated concrete panel consisting of two layers, a dense layer and a lightweight layer, after pouring a predetermined amount of mortar for the dense layer into the formwork, while the mortar for the dense layer is not hardened, Method for manufacturing lightweight aerated concrete panels, characterized by injecting mortar for lightweight layers (2) A method for manufacturing a lightweight aerated concrete panel according to claim 1, characterized in that the mortar for the lightweight layer is poured from the center of the formwork.