JPS62122705A - Continuous molding method of fiber reinforced mortar board - 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 forming fiber-reinforced mortar plates commonly used for wall materials of buildings and the like.

(Prior art) Traditionally, wall materials for buildings, etc. have been manufactured by spraying or pouring fiber-reinforced mortar into formwork, etc., and hardening it. Even if quick-hardening materials are added to give quick-setting properties, the formwork is difficult to rotate during the manufacture of wall materials, etc., and it takes many days and labor to complete the product. There was a period when the unit price increased dramatically due to the use of fibers.

(Problem to be Solved by the Invention) As a result of various studies, the present inventor found that in order to continuously manufacture inexpensive fiber-reinforced mortar plates without degrading the physical properties of fiber-reinforced mortar, it is necessary to use a moving belt conveyor. The present invention was completed based on the knowledge that fiber-reinforced mortar plates can be manufactured continuously in a short time by alternately layering rapidly hardening fiber-reinforced mortar and mortar.

(Means for Solving the Problem) That is, the present invention supplies rapidly hardening fiber-reinforced mortar onto a moving belt conveyor, stacks the mortar on top of the mortar, further layers the rapidly hardening fiber-reinforced mortar on top of the mortar, and then cures the mortar. This is a method for continuously forming fiber reinforced mortar plates.

Hereinafter, the invention will be explained based on the drawings.

FIG. 1 is a process sectional view for explaining the present invention.
That is, the first step is the step of supplying the rapidly hardening fiber reinforced mortar (hereinafter referred to as "steep FRC") 2 onto the moving belt contest booth 1, the second step is the step of tightening it with the pressure roll 3, and the sixth step is is a step of supplying mortar 4, a fourth step is a step of tightening it with a pressure roll 3, a fifth step is a step of supplying rapid hardening FRC2, a sixth step is a step of tightening it with a pressure roll 3, a step of The 7th step is a hardening acceleration step in the curing tank 5, and the 8th step is a hardening mortar version (
This is a process of cutting the FRC board (hereinafter referred to as FRC board) using a cutter 6. Although not shown in the figure, usually any deposits such as mortar are removed by scraping at any point where the belt returns.
Next, a mold release agent such as oil or fat is applied.

The steps will be explained in detail below.

The first step is a step of supplying rapid hardening FRC.
41.
A mixture of fiber v1:J quality can also be supplied by a casting method. An example of the spraying method is shown in Figure 2.

In the mortar tank 9, the slurry-like mortar gold mortar bomb 7° 10 and the mortar 4-man pipe 11 are used to pump the slurry-like hardwood from the hardwood slurry 12 to the hardwood slurry pump 13. and rapid hardening materials are respectively introduced into a continuous mixer 15 through four pipes 14, continuously mixed as a rapid hardening mortar, and supplied to a mortar spraying machine 8 through a rapid hardening mortar introduction 17. Normally, the compressed gas is used to transport the compressed gas from the compressed gas nozzle 16 to the belt conveyor 1.
is sprayed towards. The injection pressure is preferably 7'9X*' or less, and preferably 1 to 3 kgA1n2. ) If the prize output pressure is greater than 7kMv2, the rebound will be large. Further, the ejection height is preferably within 1M, and more preferably 20 to 50 cIrL. Father, it can also be supplied by pouring.

An example of the continuous mixer 15 is a line mixer.

The rapid hardening FRC can be supplied either by jetting a certain fiber material from the chopper gaff 17 toward the belt conveyor 1 and mixing it in the air at the same time as the hard mortar is jetted, or by pouring the rapid hardening mortar and then blowing it into it. It is possible to attach it. To eject the fibrous material, use the fibrous roving 1
8 is introduced into the chopper gun 17, and while cutting it into pieces of about 5 to 3 degrees, it is preferable to blow it out using compressed gas from a compressor, for example.

It is preferable to provide a side wall on the heald conveyor 1, since this makes it possible to manufacture a strong FIIC board.

The material, size, moving speed, etc. of the belt of the belt conveyor 1 can be arbitrarily selected. The material is preferably yim, steel, etc., and the usual size is 0.9 to 6.6 m in width, and the moving speed is 3.5 m/min, but is not limited thereto.

Also, if the width is wide, adjust the moving speed of the belt conveyor.
If it hurts, move the nozzle itself in the width direction.

Next, the materials used will be explained.

Various types of Portolan V are used as cement for adjusting mortar.
Cement and various mixed cements can be used. For example, mix fine aggregate with cement in any proportion, then add water and cement! A water agent is added to form a mortar with a slurry consistency that can be pumped. The mixture is not particularly limited, but 50 to 2 parts of fine aggregate to 100 parts of cement.
A ratio of 1 part by weight of 0.00 weight, 25 to 50 parts by weight of water, and 0.25 to 1 part by weight of a cement water reducing agent (in terms of solid content) is preferable from the viewpoint of fluidity and strength development. As the cement water reducing agent, commercially available ones may be used, and β-7talenesulfonate is particularly preferred.

Rapid-hardening FRC is a mixture of fibers and rapid-hardening mortar, and rapid-hardening mortar is a mixture of mortar and cement.

Rapid cement hardening materials include inorganic salts such as sodium silicate, sodium aluminate, and calcium chloride, or alumina cement, calcium aluminate, or mixtures of these with stone minerals, which act to accelerate the setting and hardening of cement. All substances having the following properties can be used, and among these, a mixture mainly composed of calcium aluminate and gypsum is preferred from the viewpoint of ease of setting start time, short-term strength development, and long-term stability. . In particular, as calcium aluminate, one having a CaQ content of 40 to 45% by weight is most preferable, and an amorphous material is most preferable because it has excellent short- and long-term strength development.

The ratio of gypsum to calcium aluminate is 0.5~
The amount is approximately 2 times the amount by weight, and there are no restrictions on the form of stones and burrs, but H-type anhydrite is suitable.

The amount of cement hardening material is 5 to 25% by weight based on the cement content.
, preferably 8 to 15% by weight. Normally, cement hardening materials are used in slurry form. The ratio of cement rapid hardening material to water in the rapid hardening material slurry (W/cement rapid hardening material) is 50 to 1.
It is about 0.00% by weight.

Further, it is preferable to add a setter to the rapidly hardening material slurry so that it hardens at any time after the completion of pressure tightening of the rapidly hardening FRC supplied to the belt conveyor.

There are no particular restrictions on the type of center, and all known types can be used, but among them, gluconic acid, tartaric acid, or their salts 5 to 20% by weight
A setter consisting of 60 to 10% by weight of citric acid or its salt and 50 to 85% by weight of an alkali carbonate is suitable because it provides a setting start time proportional to the amount added to the rapidly hardening material. The amount of setter added is usually 0.5 to 10% by weight based on the cement rapid hardening material.

In the present invention, the setting start time of the rapid hardening mortar can be freely changed depending on the type and amount of the cement rapid hardening material and setter used, but it is usually preferably 1 to 60 minutes, particularly 5 to 15 minutes. It is more preferable to set the amount to 1 minute.

If the condensation start time is shorter than 1 minute, there is a risk that the system may become clogged in the event of an unexpected accident. or,
If the time is longer than 30 minutes, the belt conveyor must be lengthened and accelerated curing becomes necessary, making it unsuitable for continuous molding lines.

Examples of the fiber material include glass fiber, organic fiber, and wood wool fiber, but from the viewpoint of durability, glass fiber, particularly alkali-resistant glass fiber, is preferred.

A ratio of glass fibers to cement of about 1 to 5% by weight is sufficient, but is not limited to this.

The second step is the rapid hardening FR supplied to the belt conveyor.
C is tightened by a pressure roll 3. This step is not an essential requirement of the present invention. From the viewpoint of adjusting the thickness variation in the width direction and the durability of the mortar, it is preferable to tighten the mortar to 6 to 15X' (2 to 1X). From the viewpoint of durability, it is more preferable to apply vibration to the belt conveyor beforehand.

Next, in the sixth step, mortar is further sprayed or poured into the rapidly hardening FRCK. The mortar thickness is preferably about 2 to 10 blades. If it is thicker than 10 mm, it will not be possible to harden at the same time as the rapid hardening FRC, and there is a risk that it will break during demolding or transportation.

Thereafter, it is similarly tightened to level the surface and apply rapid hardening mortar to a thickness of 1 m, and then sent to the curing tank 5 to accelerate hardening.

For acceleration of hardening, heating curing at a temperature of 40 to 80°C is preferable, and the FRC board is hardened to an extent that it can be easily cut. Next, it is cut to an appropriate length using a cutter 6, and if necessary, it can be cured sufficiently.

(Example) Next, examples will be given to further explain the invention.

Example 1 100 parts by weight of ordinary Portolan V cement manufactured by Denki Kagaku Kogyo ■, 80 parts by weight of No. 6 silica sand, 62 parts by weight of water, cement water reducer β-naphthalene sulfonic acid formaldehy metal-condensed metal "Mighty 150" Kao soap ■-J1m A cement mortar was prepared by kneading the clear part with a mortar mixer.

Apart from this, calcium aluminate, gypsum and 'fc
A quick hardening material slurry was prepared by kneading 1001 parts of cement rapid hardening material mixed in a ratio of 1:1:5, 70 parts by weight of water, and 5 parts by weight of sodium citrate so that the quick release FRC would harden after 10 minutes. I mixed it. These are adjusted so that the cement quick hardening material component is 15% by weight based on the cement in the mortar, and a mixer with a white line mixer (Tokushu Kikako @ Ura ) to the spray machine.

Thereafter, the compressed gas was uniformly sprayed onto a belt conveyor with a width of 0.9 M moving at a speed of 0.5 M/min. At the same time, a commercially available alkali-resistant glass fiber roving was fed into a chopper gun, where it was cut into 20 fiber lengths and mixed in the air with rapid-hardening mortar so that the proportion was 6% by weight based on the cement. It was sprayed with compressed gas so that the

In this way, rapidly hardening FRCi is continuously supplied to a thickness of 4
A rapidly hardening FRC layer of MYT was used, and mortar was not sprayed on the top surface to a thickness of 4 r+Im. Furthermore, 4 layers of rapidly hardening FRC'f are laminated on top of that, total thickness 12m.
The FRC' board was made of m. After 5 minutes, this FRc&k was placed in a steam curing tank (temperature 50″C1 length 5M) for 10 minutes.
After a further 5 minutes, the product was cut into 1ffr pieces of 1.8M to obtain a product.

A specimen of length 12 degrees, width 5 crrL, thickness 12 was made from this product, and its bending strength after 4 weeks of age was measured by the center loading method. The results are shown in the table.

Comparative Example 1 The same procedure as in Example 1+111 was carried out except that alkali-resistant glass fiber was sprayed onto the mortar in the middle in an amount of 6M relative to the cement. The results are shown in the table.

Comparative Example 2 Actual filtration example 1 except that rapidly hardening FRC was used as a single layer.
I did the same thing. The results are shown in the table.

As can be seen from the table, according to the method of the present invention, the bending strength hardly decreases even though the amount of fiber is lower than that of the conventional method.

(Effects of the present invention) The present invention provides the following effects.

1. The amount of fiber is lower than before.

2. Formwork becomes unnecessary.

6. Labor can be reduced.

[Brief explanation of drawings]

Fig. 1 is a process sectional view explaining an embodiment of the present invention;
The figure is a supply process diagram of rapidly hardening FRC. Code 1... Belt conveyor 2... Rapid hardening a F'RC
3... Pressure roll 4... Mortar 5... Curing [6... FRC board cutter 7... Rapid hardening mortar 8... Mortar spraying 1 amount of introduction g 9... Mortar 4 soda 10 ... Mortar pump 11 ... Mortar introduction pipe 12 ... Rapidly hardened material slurry tank 13 ... Rapidly hardened material slurry pump 14 ... Rapidly hardened material introduction pipe 15 ... Continuous mixer 16 ...・Compressed gas nozzle 17... Chopper gun 18... Patent applicant for Yuwei Roving Denki Kagaku Kogyo Co., Ltd. yv
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Claims (1)

[Claims] 1) Continuous forming of a fiber-reinforced mortar board characterized by supplying rapidly-hardening fiber-reinforced mortar onto a moving belt conveyor, layering the mortar on top of the mortar, and then layering the rapidly-hardening fiber-reinforced mortar on top of the mortar and curing the mortar. Method.