JPH0414230B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a method for transporting concrete and mortar, which is used to transport concrete and mortar in particulate form.

(b) Prior art In Japanese Patent Application Laid-Open No. 60-218100, the applicant carried out dry kneading of cement and aggregate in an atmosphere of sub-zero temperature, and at that time, put micronized ice into the cement and mixed it in the air. The dry-kneaded cement is similarly put into a formwork in a sub-zero atmosphere, compressed and formed, and then heated to melt the ice mixed in the cement. We are proposing a method to solidify cement by causing the surrounding cement to react.

(c) Problems to be solved by the invention With this method, it is possible to solidify cement with water equivalent to its theoretical hydration amount, making it possible to manufacture concrete and mortar members with high strength and high durability. On the other hand, the problem is how to transport concrete and mortar in particle form.

In view of the above-mentioned circumstances, the present invention aims to provide a method for transporting concrete and mortar that can efficiently transport concrete in the form of particles.

(d) Means for Solving the Problems That is, the present invention involves kneading cement and water in the form of solid particles to produce concrete/mortar in the form of solid particles; The mortar is configured to be transported to a predetermined location along with a carrier gas via a transport pipe.

(e) Operation With the above-described configuration, the present invention operates so that the concrete mortar is transported to a predetermined location through the transport pipe by the carrier gas.

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

To manufacture concrete and mortar, first add aggregate such as sand to cement in a dry state and perform dry mixing. The purpose of this dry mixing is to mix cement and aggregate evenly, and during this dry mixing, ice in the form of solid fine particles is simultaneously introduced into the cement and mixed. This operation is carried out in sub-zero conditions, so that the ice that is mixed with the cement is mixed as a solid with the cement and other aggregates. 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 dry mixing of fine particulate ice, cement, and aggregate at below freezing temperatures is completed, the mixed concrete/mortar is laid to connect the dry mixing site and the concrete/mortar placement site. transportation pipe to the pouring site.
Powder is transported under pressure using a carrier gas such as compressed air. The concrete mortar at this point is
Since it remains in a solid particle state, it can be transported smoothly through transport pipes. This transportation may be carried out in an atmosphere below freezing, or at atmospheric temperature (0° C. or higher) if the casting site is close (that is, if the transportation distance is short). If the process is carried out at ambient temperature, there is a possibility that some of the ice in the concrete/mortar will melt and start hydrating with the cement, but even in this case, the concrete/mortar may not be able to stand during the hydration process. The product arrives at the installation site, is poured into a predetermined placement location, and is allowed to complete hydration at the placement location.

On the other hand, concrete and mortar, which is pumped together with a carrier gas through a transport pipe in a sub-zero atmosphere, is injected into formwork at the pouring site, but since concrete and mortar are still in a dry particle state, they cannot be placed inside the formwork. The pouring will be carried out smoothly. When the concrete and mortar that has been poured into the formwork is heated naturally or forcibly, the ice in the concrete and mortar melts and turns into water, which causes a hydration reaction with the surrounding cement and solidifies and hardens. The ice in concrete and mortar is thoroughly and uniformly mixed with the cement by dry mixing, so that the cement undergoes a sufficient hydration reaction with the theoretical hydration amount of water and hardens. Note that the above-described heating operation can also be performed in the middle of the transport pipe or on the discharge side of the transport pipe depending on the situation at the site.

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, the water in the microcapsule state and the cement are mixed in the state of solid particles, and the concrete mortar in the state of solid particles is poured with a transport gas through a transport pipe. Transported to the construction site and poured, the microcapsules in the poured concrete/mortar are then destroyed by heating or shaking using electromagnetic waves, etc., and the water and cement in the microcapsules are hydrated. It is also possible to do so.

Furthermore, water is impregnated into a water-absorbing polymer in the form of fine particles, and this state is kneaded with cement to obtain concrete mortar in the form of solid particles. After mixing, the concrete/mortar can maintain a solid particle state for a while), and the concrete/mortar in the particle state is transported to the casting site with a carrier gas through a transport pipe, and then poured. 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) Effects of the Invention As explained above, according to the present invention, cement and water are kneaded in the solid particle state to produce concrete mortar in the solid particle state, and the solid particle state is mixed. Since the concrete mortar is transported to a predetermined location together with the carrier gas via the transport pipe, it is possible to continuously and efficiently transport concrete and mortar in the form of solid particles.

Claims (1)

[Claims] 1. Producing concrete/mortar in the form of solid particles by kneading cement and water in the form of solid particles, and producing concrete/mortar in the form of solid particles,
A method for transporting concrete and mortar in which the concrete and mortar are transported to a predetermined location along with a transport gas via a transport pipe.