JPS6047221B2 - Thermosetting molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a structure that is dense, hard, and has low water permeability by using a heat-fastening hydraulic bonding material (hereinafter referred to as thermoset cement) as the main material. It is based on a method of molding a multi-layered structure in a short time with the structure as a surface layer.

No molding method has ever been proposed that uses a hydraulic bonding material, provides a stable reuse time (or setting start time), can be quickly delivered by heating, and can be immediately removed from the mold.

In conventional methods, for example, heating early-strengthening cement does not make it urgent, and it takes a short time (within 1 hour).If you heat the early-strengthening cement without adjusting it, it becomes fast and strong, but the reuse time is short. It was short, and the re-stretching time was adjusted to 2 and a half hours, which is the same as that of ordinary cement, but even when heated, there was no rapid release.

In addition, even if heated by any heating means such as atmospheric temperature, heat conduction temperature, far infrared rays, and ultrasonic vibration at normal pressure, the temperature ranges from 91c7i to 100 to 91c7 to 350 within about 3 minutes.
There was no possibility of developing an extremely high de-fu type strength. Furthermore, there was no method of laminating thermoset cement hydrates of the same or different types with different types of hydrates or molded building materials, and then expediting and molding them by heating. However, the method of the present invention has made it possible for the first time to heat a single-layer or multi-layer structure to rapidly harden it, quickly demold it, and mass-produce it. In terms of time, a continuous production line can be used since it is possible to remove the mold after heating and grinding for 1 to 3 times. or,
When performing factory production, unless the time for each process is constant, it is not possible to set up a continuous or semi-continuous mass production line.

There is a rapid-hardening cement that hardens rapidly at room temperature at any time.
This has the advantage that the pot life can be adjusted according to the temperature, but has the disadvantage that the rapid hardening conditions set as specific conditions change according to changes in the temperature from morning to afternoon. Therefore, in Japan, where the temperature fluctuates throughout the four seasons, it is difficult to apply a production line that is limited to a fixed process time.It is therefore difficult to apply a production line that is limited to a fixed process time, and it is preferable that the molding process continues without solidification and hardening during the molding operation even if the temperature changes. There was a desire for thermoset cement, which has properties similar to thermosetting synthetic resins, but when heated and the hydrate reaches a certain temperature, it rapidly hardens and develops demolding strength. . The rapid hardening controlled cement that can be rapidly hardened at room temperature in any time at room temperature, published by the present inventor in Japanese Patent Publication No. 48-40444, and the jet cement of Onoda Co., Ltd., use a setting modifier (called a chelating agent) mainly consisting of an organic compound to perform the controlling action. However, under conditions without a chelating agent, it has a pot life of around 1 powder at room temperature, and if the pot life is extended, curing becomes slow and does not harden rapidly, so it cannot be used as a quick-hardening cement.

Also, even if you add a chelating agent to adjust the pot life to 1 hour at room temperature, in summer temperatures of 30°C or higher, the pot life will be shortened to around 2 gin, so it will naturally harden after 2 gin of heating. But, summer.
If the pot life is adjusted to 1 hour at a temperature of 30°C or higher, rapid hardening will not occur even if the hydrate reaches 80°C within two minutes of heating. Therefore, Japanese Patent Application No. 1983-5561 (Special Publication No. 53
- As proposed in Publication No. 24968), pot life 1
It is necessary to maintain the hydrated cement at a temperature of 15° C. or lower to extend its pot life and heat it to harden it. This is the first proposal in the art for a molding method in which a rapidly hardening hydraulic bonding material such as the one of the present invention is heated and rapidly hardened at any time during its pot life.
4 The method according to the present invention involves keeping a hydrate mainly composed of thermoset cement, which has a pot life sufficient for performing molding operations, at natural temperature and heating it at any time before it starts to set. By raising the temperature to 60° C. or higher, the material is rapidly hardened to develop demolding strength. The thermoset cement referred to in the present invention has a pot life sufficient to perform molding operations at atmospheric temperature, but it can be heated at any time before it starts setting and hardening to form hydrates. A hydraulic bonding material that rapidly hardens and develops demolding strength when heated above a certain temperature.

Such thermoset cement has a long and stable pot life in all seasons including summer. More specifically, the thermoset cement is CaO-Al. O
3 A hydraulic compound alone or a mixture of this and a CaO-SiO2 hydraulic compound, and a hydrofluoric acid by-product anhydrite containing hydrofluoric acid or calcium fluoride, or phosphoric acid or phosphoric acid.
Cement containing calcium and phosphoric acid by-product anhydrite containing hydrofluoric acid or calcium fluoride, or a segment in which an organic compound having a set adjustment effect is further added to such cement, which is heated at any time before the start of setting. Therefore, when the temperature of the molded hydrate reaches 60°C or higher, it is a rapidly curing hydraulic bonding material that hardens rapidly and generates demolding strength. The above cement may include gypsum hemihydrate and gypsum dihydrate (regardless of whether it is a by-product gypsum), as necessary.
Limes (quicklime, slaked lime, dolomite, dolomite plaster, calcined products thereof, etc.), water glass, synthetic resins, etc. may be added. Examples of the setting regulator include citric acid or a compound thereof, ketocarboxylic acid, ascorbic acid, 2-ketogluconic acid, ketoglutaric acid, and the like.

Thermoset cement is roughly divided into two types.

One type is a mixture of a CaO-Al2O3 hydraulic compound (hereinafter referred to as alumina cement) and by-product gypsum in any proportion, or a mixture of CaO-Al2O3 which becomes basic when hydrated with the mixture.
- Contains 30% or more of a base component, including inorganic compounds such as SlO2 hydraulic compounds (hereinafter referred to as Bortland cement) and limestone, or organic compounds such as amine compounds that exhibit strong alkalinity when hydrated. It is not a hydraulic bonding material. The other type is a hydraulic bonding material whose main component is Boltland cement, 10 to 10 parts of alumina cement (practically 15 to 25 parts), 5 to (9) parts of the above-mentioned gypsum, and a setting regulator. be. Further, a hydraulic bonding material obtained by arbitrarily adding one or more selected from lime, water glass, synthetic resin, etc. to the above two types of bonding materials also belongs to thermoset cement. The conditions are satisfied if the material is heated at any time before the start of solidification to rapidly harden it. Even if it is a rapidly hardening cement whose pot life can be adjusted without heating, it is within the scope of the present invention if it has a sufficient pot life and is rapidly hardened by heating at any time during the pot life. . However, these so-called room-temperature-curing rapid hardening cements cannot be unconditionally used in the present invention because they harden rapidly by heating only when the pot life is adjusted to within one hour at room temperature.
However, it is within the scope of the present invention to adjust the pot life to, for example, 2 hours, leave it to stand for 1.5 hours, and then rapidly harden it by heating. The curing time will vary due to changes in temperature.

Even if the amounts of alumina and SO3 components in cement are the same, the properties of the alumina and SO3 components are completely different depending on the type, so the action and effect cannot be limited by the ratio of the components contained.

It is also known that the coexistence of trace amounts of fluoride and phosphoric acid components in gypsum prolongs the setting time, but the coexistence of these components is not a problem as they do not hinder thermal curing. Also, depending on the firing temperature and powderiness, there may be cases where it is unsuitable for room temperature curing but effective for thermosetting. It is possible to modify the thermoset cement of the present invention as a main material by using thermosetting resins, thermoplastic resins, and organic compounds, and it is also within the scope of the present invention to rapidly harden by heating using such materials. . In the method according to the present invention, the thermoset cement as described above is kept at natural temperature for an arbitrary period of time before its scheduled setting start time, and heated at an arbitrary time to 60'C.
Raise the temperature to above.

If heating is continued for a certain period of time, thermoset cement will rapidly harden and develop high strength, easily achieving demolding strength. On the other hand, if it is not heated to 60'C, it will set but not harden. There are no particular limitations on the heating mode, but when thermocement hydrate is cast into a mold and heat-cured, the cast hydrate shrinks or expands when it is heated and cured. Conversely, it is desirable to use a surface forming material in the formwork that does not expand or contract when heated. If the surface forming material expands due to heating, or if the hydrate cures and contracts due to heating, the surface layer of the hydrate will necessarily be destroyed during curing and will not become dense. There is a well-known method of molding a glossy surface layer by casting alumina cement hydrate at room temperature using glass or hard or semi-hard synthetic resin as a base plate, but if this is heated and hardened, it will become glass. As the hard synthetic resin expands and the cured hydrate material contracts, the expansion and contraction of the plate and the molded product reverses, and the surface layer is destroyed, resulting in no gloss.

Normally, hydrates harden and shrink when heated, but in this case, if plastics, stretched films, sheets, etc. mixed with plasticizers, which have the property of shrinking when heated, are used for the support plate,
Even when heated, both the plate and the cured product become shrinkable, resulting in a dense surface layer. If metal or glass is to be used as the board, it will expand when heated, so thermoset cement must be used because it has the property of expanding when hardened. There is also a method of compressing with strong pressure to suppress the distortion caused by expansion and contraction, then heating and hardening molding, but the molding cycle is slow and
The defective rate is high and productivity is low. Clamping with strong pressure is theoretically possible but extremely difficult in practice in order to suppress expansion and contraction distortion caused by heating of the clamping plate and the cured product.

The method of the present invention enables high-cycle mass production with simple equipment without pressing under normal pressure. It goes without saying that clamping to a low pressure is within the scope of the present invention as long as the principles of the present invention are used. The present invention can also be used to form multi-layer thermoset cement moldings.

When the structure according to the present invention as described above is used as a surface layer and a backing layer is further provided to form a multi-layered structure, the amount of hydration water in the backing layer must be reduced while the surface layer is hardened by heating. It is desirable that the backing layer be molded in such a way that it retains water and maintains a moist state. For the backing layer 7, thermoset cement with the same or different composition as that of the surface layer, a hydrate of a room-temperature curing hydraulic bonding material, a pre-molded building material, etc. can be used. The surface layer hydrate treated and molded according to the present invention absorbs and dehydrates excess water and retains only hydration water close to the theoretical value. When the backing layer is heated, if the surface layer is also heated and the hydration water retained therein is reduced, curing will be poor and a dense surface layer will not be obtained. If the front and back layers are composed of thermoset cement hydrate, which has the same compounding material, if the water ratio of the backing layer is high, it will not dry before the surface layer hardens, and for example, the surface layer will harden at 60°C. It is also effective to use thermoset cement hydrates with different curing temperatures such that the backing layer is thermally cured at 80° C. and the surface layer remains moist until the surface layer is cured.

In addition, even hydrates like calcined gypsum that harden rapidly at room temperature have good water retention properties, so if they contain excess water, they retain water and maintain a moist state even when heated, so the backing layer It can be used for Furthermore, molded building materials that contain water and retain moisture, such as gypsum board, silicon calboard, asbestos valve board, and foamed concrete, can be used by impregnating them with water and keeping them moist until the surface layer hardens. You can also do it. Although slow-setting cement cannot be removed from the mold early, there is no problem in using it. However, cement that hardens rapidly in a short period of time is not suitable because it hardens rapidly, generates heat, dries, and dehydrates the surface layer. Furthermore, when thermoset cement hydrate is heat-cured and molded, especially when molding a multi-layer structure consisting of a surface layer and a back layer, it is necessary to close it almost completely, but avoid completely sealing it. It is desirable to perform heat curing.

In order to thermally cure thermoset cement hydrate, it is necessary to raise the temperature of the hydrate uniformly and rapidly so that it begins to harden, and it is also necessary to prevent water shortage, so the hydrate must be closed. However, since air bubbles will expand if they are sealed, it is desirable not to seal them. As in the present invention, thermoset cement hydrate is molded with the required water retention amount, and it hardens rapidly when heated. In some cases, lack of water can cause poor curing.

It is known that when cement is heated to accelerate its hardening, it is covered with a sheet to keep it warm, but even if it is not covered, it will not harden and cause poor hardening. It is sufficient to replenish the water by sprinkling water. Sir like the invention! If you want to rapidly harden moset cement by heating it without closing it, first of all, if you put the cast mold into a high ambient temperature, hardening will start from the surface in contact with the atmosphere and the surface layer of hydrates will form. is dehydrated, resulting in poor curing, and even if heated from the bottom of the mold, the heat is dissipated from Z due to the generation of heat of vaporization, and the temperature of the upper layer does not rise rapidly, causing water shortage and resulting in poor curing. Unless the temperature of the cast hydrate rises uniformly and rapidly, the object of the present invention cannot be fully achieved. Secondly, as mentioned above, since the hydrate is maintained at the required amount of water retention, it is obvious that if the water is evaporated by heating, there will be a lack of water and poor curing will occur. According to the invention, it is therefore highly desirable to close the cast hydrate. However, sealing them does not necessarily yield the desired results. If it is sealed, the backing layer retains excess water, which heats up and forms bubbles, destroying some of them. This is particularly noticeable in fibers and lightweight aggregates, which contain air bubbles. ) If a hydrate that hardens rapidly at room temperature, such as plaster, is used for the backing layer, it will not harden poorly because it has good water retention even if it is not closed, whereas the surface layer will not close when it comes into contact with the formwork, etc. Therefore, in such cases, heat forming without closure is especially effective.

Even if a moist/water-containing molded building material is used for the backing layer, heat molding can be similarly performed without closure as long as it retains moisture.
However, it can be said that in these cases the molded building material itself is used to close the thermoset cement surface layer. The expansion and contraction of the cured molded product that occurs when the hydrate of the molded surface layer treated as described above and the hydrate or molded product used for the backing layer are simultaneously heated and cured or dried is molded. Select the type of bonding material used for the shape of the body, the water mixture ratio to the bonding material, the water content ratio, the aggregate ratio, the amount and type of reinforcing material, and the molded product to create a hydrate and heat at the same time. It is desirable to cure, dry and form a dimensionally stable laminate. Using thermoset cement, a structure having a beautiful surface layer that is dense, hard, and has little water permeability can also be molded by thermosetting according to the present invention. In this case, for example, a hydrate is cast into a mold, pressurized to produce floating water, and excess water is almost completely removed to form a structure. If the water-cement ratio of the hydrate constituting the surface layer is large, cracks will occur in the surface layer after heat curing and drying, or a large number of dehydration holes will be formed, making it impossible to form a dense surface layer.

Also, if the water-cement ratio is reduced, high strength and hardness can be achieved, but many pores are created in the surface layer, making it impossible to reduce water permeability or make the surface beautiful. Even if excess water is simply removed by applying pressure while applying vibration, dehydration holes remain and a dense surface layer cannot be obtained. Further, even if vacuum dehydration is performed under pressure, the dehydration surface becomes clogged and almost complete dehydration cannot be achieved, and if vacuum dehydration is performed sufficiently, dehydration holes remain. Even when dehydrating in vacuum and then molding by applying pressure, it is impossible to remove only excess water from the hydrate, and excessive dehydration results in poor curing if heat curing occurs. or,
Even if vacuum kneading is carried out using the theoretical amount of water and cast molding is performed, it is not always possible to knead the product under conditions where there is no excess water due to differences in particle size, particle surface area, and solubility, and air bubbles may remain even if the material is simply cast. I can't pretend not to. In fact, with known techniques, it is nearly impossible to remove excess water from the hydrate before the hydrate is cured. Excessive water absorption would result in poor curing, and if excess water remained, pores would remain. Thus, it has been extremely difficult to reduce the water permeability from the surface without causing poor curing. A simple way to prove this is to mix pigments and check whether the color develops brightly or maintains the color. Unless the treatment of the present invention is carried out, the color develops for a long time and the bright color does not change. It does not develop color. In the present invention, the hydrate cast into a mold is pressurized to extrude excess water to the side to make it float, and by almost completely absorbing and dehydrating this excess water, the surface layer is formed after thermosetting molding. Do not leave any air bubbles or evaporation pores.

In the molding process of the present invention, the thermoset cement is heated to 60'C or higher to rapidly harden it, so if any excess water remains in the cement, it evaporates during heating, and evaporation holes are formed in the cement after the cement hardens. The method of the present invention enables the above-mentioned molding with such results.
To pressurize the hydrate and make the excess water float, pressurize with a shaping material so as not to destroy the surface of the hydrate. There are methods such as pressurizing a part of the water to spread it over the entire surface, or using a shaping material whose surface material is a spongy body, a foamed product, a fiber material, etc. to both apply pressure and absorb water.

These methods are more effective if they are performed while applying vibration. Although the embodiments of the present invention have been mainly explained above with a focus on molding by mold casting, it is clear that the present invention can also be used in molding without using a mold by using a mold. .

Next, examples will be shown.

Example 1 64 parts of Voltland cement, 2 parts of alumina cement,
A cement mixture of w parts of anhydrite, 5 parts of gypsum hemihydrate, and 1 part of gypsum dihydrate has a pot life of only about 1 powder at room temperature and requires a chelating agent to adjust, but it has 64 parts of Bortland cement, 18 parts of alumina cement, A mixed cement of 15 parts of hydrofluoric acid by-product anhydrite and 3 parts of phosphoric acid by-product dihydrate gypsum does not require a chelating agent and has a sufficient pot life and can be heated to a hydrate temperature of 80.
When it reached ℃, it suddenly hardened.

Example 2 Anhydrous gypsum (60%
(calcined at 0°C) in free proportions W/C = 0.35
Under these conditions, the pot life of all the samples was 20 gin or more at 20°C.

The pot life was measured when the Vicat needle sank 2m1m. 2c
In a metal formwork of m x 2c 7ft x 8cm, S/C = 1, W
/C = 0.45 After pouring various mixed cements, put them in a moist curing box and adjust the thermostat to 80°C and heat them for 3 minutes, then take them out and let them cool for a while, then immediately test the strength. was measured.

Typical results are shown in the table below. Example 3 Tests were carried out using the same test method as in Example 2, with the addition of ordinary cement and various types of gypsum. The results are shown in the table below.

5 Alumina cement electrification No. 1 Ordinary cement indicated by the letter K1 PC Nitto Fluorine by-product gypsum 6000 calcined anhydrite BCS Yoshino dihydrate gypsum
K Yoshino Sei Hanhydrate Gypsum
1-2CS Example 4 The alumina cement in Example 3 was made of Asahi Glass Co., Ltd.'s alumina cement (trade name: Asahi Fuonjiyu) (referred to as H2) containing ferrous oxide, ferric oxide, and titanium oxide as components, and ordinary cement was oxidized. Early-strength Voltland cement manufactured by Nippon Cement Co., Ltd. containing chromium and manganese oxide (product name: Super Velo)
(referred to as SVC), the pot life was extended and the initial strength was also good.

Example 5 Furthermore, the superbe used in Example 4 was 64%, Nippon Cement Co., Ltd.'s Alumina Cement No. 1 was 20%, anhydrite calcined at 600°C of the hydrofluoric acid by-product gypsum was 12%, and hemihydrate gypsum was 4%. % compounded cement had a pot life of only 25 minutes at 20°C, but when the alumina cement was replaced with Asahi Fuonjiyu, the pot life was extended to 12 gin at 35°C, and the 45-minute strength using the above method was 175k91d. .

In this example, if the alumina cement is 10% or more, it is 60%.
By raising the temperature of the hydrate between 100°C and 100°C, it was cured and demolded in a short time.

A standard mortar containing lυ1 or more with a pot life of 4 hours or more was heated with saturated steam at 70°C one hour after mixing.

Immediately removed from the mold, compressive strength after 3 hours after heating is 105K
The weight increased to 410 kg after 4 weeks. The compositions of the hydrofluoric acid by-product gypsum and the calcined acid by-product gypsum used in the present invention are as follows. Hydrofluoric acid by-product gypsum (Nitto Fluorine's hydrofluoric acid by-product gypsum) υB. 1 * Some fluorine exists in gypsum in the form of HF.

Phosphoric acid by-product gypsum (Yoshino by-product gypsum) *1 Some fluorine exists in gypsum in the form of HF.

*2 It exists in the form of phosphoric acid or calcium phosphate in gypsum.

Example 7 Denka No. 1 alumina cement 85%, ordinary cement 5%,
The cement mixed with 10% 600'C calcined anhydride of the hydrofluoric acid byproduct gypsum has a pot life of 200 degrees or more at 20°C, but this cement has an S/C of 1 and a W/C of 0.
．． 45 mortar was poured into an iron plate form, a thermocouple was inserted into the mortar as well as the form, and the temperature rise was observed while heating with an infrared ray lamp.

When the mortar temperature exceeded 60° C., there was a sudden rise in temperature, which is thought to indicate heat generation during curing. Also 6
When the temperature reached 0°C, the heating was stopped, but after that it still showed a rapid rise and hardened. Example 8 Mixed cement 9C8, w parts of green inorganic pigment and water-cement ratio (W/C
)=0.45. The embossed 0.17Tt. 1 of the above mortar was applied to a formwork with IrrL thick soft sheet as a side plate.
TrL, I7T1. It was cast to be thick.

Excess water was absorbed and dehydrated while pressurizing this with a semi-hard sponge having an uneven surface. After this, place the glass fiber and further W.
The above blended mortar with /C=0.6 was lined and cast to a thickness of 3 ml and 1 m. Gently shape this with a sponge while absorbing water, then cover it with a polyvinyl chloride film for 70 minutes.
The mold was placed in a steam curing room with a thermostat adjusted to 30 minutes and then removed from the mold for 30 minutes. There was no efflorescence at all and the color was beautiful. We also examined the length change of 1 m, and found that the warpage was slight. The cement used in this example had S/C=1, W/C=0.45, the pot life of the mortar at room temperature was 200 minutes or more, and the compressive strength after heating at 70℃ for 30 minutes was 340k91d. , and after 7 days it became 560k91cT1. Example 9 The mortar used in Example 8 was stamped into 0.2m1m
．． It was poured to a thickness of 0.5 TL'm into a formwork made of thick leather, and the excess water was made to float by hitting a hard comb with uneven surfaces.
After that, water is absorbed and dehydrated using a water-absorbing mat, a glass mat is placed on top of this, and a mixed cement containing 64 parts of alumina cement, 8 parts of hydrofluoric acid by-product anhydrite, 8 parts of calcium sulfite, 2 parts of dihydrate gypsum, and 18 parts of Bortland cement is added. W/C=0.7
, S/C=1 was adjusted to mortar, and this was poured into the backing layer.

A film was placed on top of this and heated with a far-infrared lamp.
When the molded body reached about 700C, the surface layer had already hardened and the backing layer showed rapid hardening. When the mold was removed directly, the surface layer showed a beautiful colored uneven pattern. Also, no warping occurred. The pot life of the cement using the backing layer at room temperature is 200 minutes or more, and its S/C = 1 and W/C.
When heat-curing three powders of =0.45 at an atmospheric temperature of 70'C, the strength was 180 kg1cIt 45 minutes after the start of heating and reached 490kgId after 7 days. Example 10 After placing a glass mat on the molded surface layer of Example 9, 0.03 parts of citric acid was mixed into the calcined gypsum to extend the pot life, pearlite was used as the aggregate, and W/C =0.8. S/
It was adjusted to C=0.5 and cast to 97n. It was made to have an IrrL thickness and was then cast with a mat added.

Since gypsum has good water retention properties, it was heated at an ambient temperature of 80° C. without being closed. After three powders, the heating was stopped, the product was taken out, cooled, and demolded.

The surface layer showed a beautiful pattern and was sufficiently hardened, and the plaster of the backing layer was hardened and still moist. The calcined gypsum used for the backing layer hardens rapidly even at room temperature, but if you combine alumina cement with dihydrate gypsum or anhydrite and make mortar with alkaline water, it will not harden rapidly at room temperature, but when heated, the temperature will vary depending on the composition. However, since it hardens rapidly, it could be used as a backing layer. However, the pot life was considerably shorter than when using by-product gypsum. Example 11 When molding under the conditions of Example 8, an iron plate was used as a surface plate, a mold was placed on top of it, a thermocouple was attached to the molded hydrate and the iron plate, and the iron plate was heated to form the molded hydrate. Heating was stopped when the temperature reached 60'C.

After 6 minutes, it was observed that the mold hardened and developed demolding strength, so it was cooled and demolded immediately. Example 12 Voltland cement 6'5, alumina cement nodule, and 18 parts of the above-mentioned hydrofluoric acid by-product anhydrite were mixed to make cement, and this was made into mortar (S/C=1, W/C=0.45). Then, cast a stretched polypropylene resin film into a formwork with a side plate to make it 17n, ITrL thickness, spread it over the entire part while applying pressure with a protruding rod, and make the excess water floating. Excess water was absorbed and dehydrated with silica gel, and then the same cement 5 with S/C=1. ．． Mortar with W/C=0.7 was heated to 2TrL. It was cast to have an ITrL thickness, and a chemical fiber woven fabric was press-fitted onto it while being vibrated, and water was absorbed while being shaped with a sponge.

This is covered with a film and heated with far infrared rays, and the molded product becomes 80%
Heating was continued until the temperature reached .degree. C., and after 3 degrees of O heating, the heating was stopped, cooled, and demolded. After one day, the molded body was subjected to a water permeability test using a cylinder water column, which is a known test method.
The amount of permeation was so small that it was impossible to measure it.

Moreover, the surface was smooth and shiny. I also tried using brass powder instead of sand for the surface layer, and the surface was made of metal, resulting in a beautiful and highly conductive surface layer. Reference Example In Example 10, S without using glass fiber
It was lined with mortar of /C=2 and W/C=0.45 and thermosetting molded in the same way, but it warped after 3 days.

Example 13 7% of a rust-colored pigment was added to a cement with a composition of Alumina Cement Co., Ltd., 5 parts of hydrofluoric acid by-product anhydrite, and 5 parts of Boltland cement, and S/C=1 and W/C=0. 17nm mortar was adjusted to a formwork made of polyvinyl chloride sheet with an uneven pattern resembling natural stone. Cast the mold to a thickness of Im and remove excess water while applying pressure as described above.
Furthermore, a glass mat was placed, and 1 part of alumina cement, 18 parts of anhydrite, and 3 parts of mortar with S/C = 1.5 and W/C = 0.7 of the blended cement of Boltland cement sitting part were added.
It was lined to a thickness of 771.1 m, then water was absorbed and dehydrated, and 0.3 parts of citric acid was added to jet cement manufactured by Onoda Cement Co., Ltd. to extend its pot life.
The concrete was mixed with a mixture of gravel 3 and W/C=0.6 and cast to a thickness of 507TLIm.

Claims (1)

[Claims] 1 CaO・Al_2O_3 hydraulic component alone or a mixture of this and CaO・SiO_2 hydraulic component, and hydrofluoric acid or hydrofluoric acid by-product anhydrite containing calcium fluoride or phosphoric acid or Contains phosphoric acid by-product anhydrite containing calcium phosphate and hydrofluoric acid or calcium fluoride, and can be rapidly hardened by heating to raise the temperature of the molded hydrate to 60 degrees Celsius or higher at any time before setting begins. A method of rapidly hardening and molding by placing a hydrate of a hydraulic bonding material that generates demolding hardness, and heating the hydrate while closing but avoiding sealing to raise the temperature of the hydrate. 2 CaO・Al_2O_3 hydraulic component alone or a mixture of this and CaO・SlO_2 hydraulic component, and hydrofluoric acid or hydrofluoric acid by-product anhydrite or phosphoric acid containing calcium fluoride or calcium phosphate and hydrofluoric acid or It contains phosphoric acid by-product anhydrite containing calcium fluoride, and further contains an organic compound that has a setting regulating effect, and the formed hydrate is heated to a temperature of 60 degrees Celsius or more at any time before the start of setting. A hydrate of a heated rapidly hardening hydraulic bonding material that hardens rapidly and generates demolding hardness when heated is poured, and the hydrate is heated to raise the temperature of the hydrate while being closed, avoiding airtightness. Method of rapid hardening.