JPS62184808A - Manufacture 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) Field of Industrial Application The present invention relates to a method for producing concrete mortar using an added quick setting agent.

(b), Prior Art Conventionally, when adding an quick-setting agent to concrete or mortar, the quick-setting agent was added to the concrete or mortar at the site immediately before use.

(C) 0 Problems to be Solved by the Invention However, with these methods, it is difficult to uniformly mix the quick-setting agent into the concrete/mortar, and as a result, the solidification rate of the concrete/mortar is uneven. This causes the inconvenience that .

Another method is to add a quick-setting agent at the ready-mixed concrete factory, taking into consideration the time required for pouring, so that the quick-setting agent mixes evenly with the concrete, but in that case, depending on the traffic conditions along the way, The disadvantage is that the solidification state of the concrete upon arrival at the site is affected.

In order to eliminate the above-mentioned drawbacks, the present invention provides a method for producing concrete and mortar, which not only allows the addition of an accelerating agent in a uniform state, but also allows appropriate solidification control of the concrete and mortar. The purpose is to

(d) Means for solving the zero problem, that is, the present invention, when performing dry kneading of cement and aggregate, the quick-setting agent and water are added in the form of solid fine particles, and then the When dry-mixed cement I is used, the solid particulate state of the quick-setting agent and water is released, and the cement is made to react with the water and quick-setting agent, which have been released from the solid particulate state, to solidify the cement. It is composed of

(e) 6 Effects With the above-described structure, the present invention allows the quick-setting agent that has been made into solid microparticles and water to be uniformly mixed with the cement in a dry state during dry kneading of cement, so that the quick-setting agent and water can be mixed uniformly with the cement in a dry state, and the quick-setting agent can be rapidly set for the first time when the cement is used. agent and water and cement) - act to initiate which reaction.

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

When producing concrete and mortar, first, aggregate such as sand is added to cement in a dry state, and then dry mixing is performed. The purpose of this dry mixing is to evenly combine cement and aggregate, and during this dry mixing, an aqueous solution of an accelerating agent encapsulated in microcapsules is simultaneously introduced into the cement and mixed.

The quick-setting agent encapsulated in microcapsules can be prepared by ordinary dry kneading;
The capsule will not be destroyed by the operation, so
Dry kneading is properly performed in a dry state.

In addition, it is desirable that the particle size of the microcapsules is comparable to that of cement in order to obtain uniform air-mixed cement.

The amount of the quick-setting agent in the microcapsules depends on the desired solidification rate of the concrete/mortar to be manufactured, and microcapsules containing an appropriate concentration of the quick-setting agent can be used. In addition, the amount of water in the microcapsules should be adjusted in advance so that it is necessary and sufficient for concrete to solidify once the microcapsules containing an appropriate amount of quick-setting agent are added to the cement. .

After the aqueous solution of cement, aggregate, and quick-setting agent in microcapsule form has been dry-mixed in this manner, the dry-mixed cement is transported to the casting site using an appropriate transportation means. The cement dry mixing site and the concrete/mortar casting site do not necessarily have to be close to each other; if they are far apart, a dump truck or the like is used to transport them. As mentioned above, dry mixed cement is dry, so it is sufficient to transport it using a normal transport vehicle without using a special vehicle such as a concrete mixer truck.

When the dry mixed cement is transported to the pouring site, it is poured into the formwork to be poured. Next, the cement placed in the mold is irradiated with electromagnetic waves or the like to heat the microcapsules. Then, the heated microcapsules are destroyed, and an aqueous solution containing an accelerating agent flows out into the surroundings. Then, the surrounding cement and the outflowing water cause a hydration reaction, and further, due to the action of the quick-setting agent contained in the water, the cement rapidly solidifies in a predetermined period of time. Since the microcapsules are uniformly distributed in the cement by dry kneading, the destruction of the microcapsules causes the cement to harden in an overall uniform state.

In addition, although the above-mentioned example described the case where dry-mixed cement was poured into the formwork, this dry-mixed cement can be used not only for pouring into the formwork but also for tunnel lining. Naturally, it can also be used by spraying it from a nozzle, as in the case of constructing a . In this case, a heating means such as an electromagnetic wave oscillation means is provided at the tip of the nozzle to heat the dry, dry cement blown out from the nozzle, destroy the microcapsules, and hydrate the cement with the aqueous quick setting agent solution. The reaction takes place between the rocks where the concrete is sprayed from the tip of the nozzle, and the rocks are coated with water-retentive, rapidly solidifying concrete and mortar.

In addition, in the above embodiment, the quick-setting agent is made into an aqueous solution, encapsulated in microcapsules, and added to the cement during dry mixing. However, the quick-setting agent is in the form of solid fine particles containing water. In addition to encapsulating it in microcapsules, an aqueous solution of the quick-setting agent can be produced in the form of frozen solid particles, and then placed in a sub-zero atmosphere. Of course, it is also possible to dry mix it with cement. In this case, dry-mixed cement is used until it is used for pouring or spraying.
It must be transported and stored in an atmosphere below freezing. In addition, during use, the formwork into which the dry-mixed cement is charged is heated naturally or forcibly.

Then, the ice containing the quick-setting agent melts and the concrete mortar solidifies. In addition, when spraying, it is preferable to provide an appropriate heating device at the tip of the nozzle.

In addition, the amount of water in the aqueous solution of the quick-setting agent, which is added in the form of solid fine particles into the cement, is necessary to solidify the cement because the solid fine particles of the quick-setting agent are mixed with the cement in a sufficiently uniform state. A theory like Eiwakei is enough.

(g) 0 Effects of the Invention As explained above, according to the present invention, when dry mixing cement and aggregate, the quick-setting agent and water are added in the form of solid fine particles, and then , when using the dry kneaded t-cocement, release the quick-setting agent and water from the solid fine particle state,
Since the cement is made to react with the water released from the solid particulate state and the quick setting agent to solidify the cement,
Not only can the quick-setting agent be mixed into the cement in a uniform state, and therefore the solidification rate can be made uniform throughout, but the quick-setting agent starts working only when concrete and mortar are used. Since it is done on-site, it is easy to accurately control the solidification time of concrete and mortar.

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

Claims (1)

[Claims] When performing dry mixing of cement and aggregate, an accelerating agent and water are added in the form of solid fine particles, and then, when using the dry mixed cement, the above-mentioned A method for producing concrete/mortar comprising: releasing the solid particulate state of the quick setting agent and water; and causing cement to react with the water released from the solid particulate state and the quick setting agent to solidify the cement.