JPS62202170A - Production of concrete/mortar - 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 (a) Industrial Application Field The present invention is directed to a mixture of cement and water in a solid particle state (hereinafter, water in a solid particle state is referred to as "solid particle water"). The present invention relates to a method for producing concrete and mortar suitable for transportation and pouring.

(b) In Japanese Patent Application Laid-Open No. 60-218100, the applicant of the prior art conducted dry kneading of cement and micronized ice in a sub-zero atmosphere, and the dry-mixed cement was similarly kneaded in a sub-zero temperature atmosphere. We proposed a method in which the cement is compressed by being placed in a formwork in an atmosphere, and then heated to melt the ice mixed in the cement, causing the melted ice to react with the surrounding cement and solidifying the cement. ing.

(C)0 Problems that the invention attempts to solve In this method,
It is now possible to solidify cement with water at a level equivalent to its theoretical hydration amount, making it possible to manufacture concrete and mortar components with high strength and durability. The problem is how to transport and place it.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a method for producing concrete and mortar that can efficiently transport and place concrete and mortar in the form of solid particles.

(d) Means for Solving Zero Problems That is, the present invention involves kneading cement and water in the state of solid particles of water to produce a cement solid particle water mixture; The water mixture is conveyed together with a carrier gas through a transport pipe to a predetermined casting location, and at the casting location, aggregate is added to the cement solid particle water mixture transported from the transport pipe and mixed to form concrete and mortar. Configured to manufacture.

(e) 0 effect With the above-described configuration, the present invention provides that the cement solid particle water mixture is transported in the transport pipe by the carrier gas to a predetermined casting site, and that the cement solid particle water mixture is Materials are added and mixed to produce concrete and mortar.

(f), Example Examples of the present invention will be specifically described below.

To manufacture concrete mortar, first, dry cement and ice in the form of solid fine particles are mixed to a uniform state to obtain a cement solid particle water mixture. This operation is carried out in sub-zero conditions and therefore the ice that is mixed with the cement is mixed as a solid. The particle size of ice is preferably similar to that of cement, and ice with this particle size is produced by applying ultrasonic vibrations to liquid water to atomize it, and then instantaneously cooling the atomized water. do. Further, the amount of water mixed in as ice is set to about the theoretical hydration amount that hydrates the cement.

In this way, once the drying of fine particle ice and cement at sub-zero temperatures is completed, the dry cement solid particle water mixture is used to connect the drying site and the concrete/mortar placement site. Using a conveying gas such as compressed air, the powder is transported under pressure to the pouring site through the installed transport pipe.

Since the concrete mortar at this point remains in a solid particle state, it can be transported smoothly through the transport pipe. In addition, the transported cement solid particle water mixture does not contain aggregates such as gravel, and therefore there is no extreme difference in weight between the ice and cement that make up the cement solid particle water mixture. There is no possibility that ice and cement will separate during pipe transportation. As for fine aggregate such as sand, there is little risk of it separating during transportation, so it should be added at the same time as mixing with ice.
May be transported.

Even if this transportation is carried out in an atmosphere below freezing, if the pouring site is close, that is, if the transportation distance is short, the atmospheric temperature (0°C
(above)) You can also do it inside. When carried out at atmospheric temperature,
There is a possibility that some of the ice in the cement solid particle water mixture will melt during the process and start a hydration reaction with the cement, but even in that case, it is best to arrive at the casting site during the reaction.

On the other hand, in a sub-zero atmosphere, the cement solid particle water mixture that has been pumped together with the carrier gas through a transport pipe is mixed with coarse aggregate such as gravel and fine aggregate such as sand at the casting site. . In this way, by mixing the aggregate at the pouring site, the aggregate, cement, and granular water are mixed in a homogeneous state to form a concrete mortar suitable for pouring. In this state, the concrete mortar is injected into the formwork. Since the concrete mortar is still in a dry particle state, it can be poured into the formwork smoothly. When the concrete/mortar that has been poured into the formwork is heated naturally or forcibly, it becomes concrete (concrete).
- The ice in the mortar melts and turns into water, causing a hydration reaction with the surrounding cement and solidifying and hardening. Since the ice in the concrete mortar is sufficiently and uniformly mixed with the cement by drying, the cement will undergo a sufficient hydration reaction and solidify with water at a theoretical hydration level i.

The heating operation described above can also be performed in the middle of the transport pipe, on the discharge side of the transport pipe, or even during kneading with the aggregate, depending on the site situation.

Furthermore, in the above embodiment, water is mixed with cement in the form of fine ice particles, but water and cement may be mixed in any form as long as they are mixed in the form of solid particles. Transport via transport pipes is possible.

For example, water encapsulated in microcapsules is poured into cement, and the water in the microcapsule state and cement are kneaded in the state of solid particles to obtain a cement solid particle water mixture, and the mixture is transported through a transport pipe. Transported with gas to the casting site, aggregate is added and kneaded, and poured, and then the microcapsules in the poured concrete/mortar are destroyed by heating or shaking using electromagnetic waves, etc. It is also possible to hydrate the water and cement in the microcapsules.

Furthermore, water is impregnated into a water-absorbing polymer in the form of fine particles, and the water is kneaded with cement in that state to obtain a mixture of cement and solid particles in the form of solid particles (the water in the polymer is not rapidly discharged to the outside). So, after kneading, for a while (yo,
(the cement solid particle water mixture can maintain a particle state), the cement solid particle water mixture in the particle state is transported to the casting site together with a gas supply through a transport pipe, and aggregate is added and kneaded. It is also possible to use a method in which the water contained in the polymer is discharged by applying pressure or vibration, and the water causes a hydration reaction.

(g) 0 Effects of the Invention As explained above, according to the present invention, cement and water are kneaded in the state of water solid particles to produce a cement solid particle water mixture, and the cement and water in the state of solid particles are produced. The solid particle water mixture is transported together with a carrier gas through a transport pipe to a predetermined casting location, and at the casting location, aggregate is added to and mixed with the cement solid particle water mixture transported from the transport pipe to form concrete. Since it is configured to produce mortar, the cement solid particle water mixture in the solid particle state can be continuously and efficiently transported. In addition, since the aggregate is mixed with the cement solid particle water mixture at the casting site, it is possible to avoid the situation where the relatively heavy aggregate separates from other cement and granular water during transportation. This makes it possible to produce uniform, high-quality concrete and mortar.

Applicant: Mitsui Construction Co., Ltd. Agent Patent attorney Phase 1) Shinji (1 other person)

Claims (1)

[Claims] Cement and water are kneaded in the solid particle state of water to produce a cement solid particle water mixture, and the cement solid particle water mixture in the solid particle state is conveyed together with a carrier gas through a transport pipe. Manufacture of concrete/mortar configured by transporting the cement to a predetermined placement site, and at the placement site, adding and mixing aggregate to the cement solid particle water mixture transported from the transportation pipe to produce concrete/mortar. Method.