JPS6023557A - Kneading and forcibly sending method of ultra-light weight heat insulating concrete - 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) 0 Technical Field of the Invention The present invention relates to a method for kneading ultra-light insulating concrete used for insulating LPG or LNG tanks.

(b), Technological backstory Ultra-light insulating concrete C used for insulation of LPG and LNQ tanks, etc. As aggregate, East Tyrol foam, styrene foam, glass foam material, foam i1! A porous material with heat insulating properties, such as i-sakugan, is used.

However, if water-absorbing aggregates such as glass foam or foamed rock are used as aggregates, when pumping fresh concrete, the water in the concrete will be absorbed by the pressure of the pump into lightweight porous materials. The viscosity of the concrete is D (concrete 1.
This method has the drawback of causing a blockage phenomenon in the pressure-feeding pipe that transports the material.

Moreover, the squeeze-type, piston-type, and other pumps that have traditionally been widely used as pressure pumps have extremely large pressure fluctuations and maximum pressures during pumping, which promotes the absorption of water in fresh concrete into lightweight porous materials. There was an inconvenience.

In addition, since aggregate made from lightweight porous materials is lightweight,
There was also the problem that the aggregate and cement separated in the pressure pipe, resulting in uneven physical properties of the concrete that was placed under pressure.

Therefore, when using ultra-light insulating concrete as insulation material for LPG or LNG tanks, in order to avoid clogging phenomena in the pipes and changes in the physical properties of the concrete, it is necessary to use ultra-light insulating concrete intermittently in fixed amounts using crane packets, etc., without using a pressure pump. They were forced to carry out extremely inefficient work.

(d) 0 Purpose of the Invention The present invention is intended to solve the above-mentioned drawbacks (even if water-absorbing aggregate is used, water in concrete is rarely absorbed by the aggregate; Pressure feeding is possible with the physical properties of concrete 1 and 2 being kept uniform,
The purpose of this invention is to provide a method for kneading and pumping ultra-light insulating concrete.

(e) Configuration of the invention 0, that is, the present invention, during kneading, first places the aggregate in an input field, sprinkles an inorganic thickener on the aggregate, and then adds an organic admixture together with water. The system is configured so that it is allowed to cool for a predetermined period of time, then cement is added and mixed, and the mixed concrete is then pumped using a concrete pumping means.

(f) 0 Embodiments of the Invention Hereinafter, embodiments of the present invention will be specifically described based on the drawings.

FIG. 1 shows the super fI! according to the present invention! Figure 2 is a flowchart showing an example of a method for kneading and pressure-feeding heat-insulating concrete.
Figure 3 is a diagram comparing the blending example of ultra-lightweight insulating concrete used in the implementation of the present invention with the blending example of conventional ultra-lightweight insulating concrete. FIG. 4 is a diagram comparing the physical properties of ultra-light insulating concrete based on the formulation shown in FIG. 2 with the physical properties of ultra-light insulating concrete based on the conventional formulation.

An example of the method for kneading and pressure-feeding ultra-lightweight insulating concrete according to the present invention will be explained based on the flowchart shown in FIG. That is, aggregate made of a lightweight porous material for ultra-rIi insulating concrete is put into an omni mixer or the like which is an R# means, and then in step S2, an inorganic thickener such as silica magnesium is added to the injected bone. Sprinkle it on the surface of the material. Furthermore, in step S3, water and organic admixtures such as fatty soaps, soaps, synthetic surfactants, etc. are put into the mixer, and kneaded for about 1 minute in step S4. Appropriate moisture is absorbed into the aggregate, resulting in so-called pre-etching.
A water film with viscosity caused by the thickener is formed on the surface of the aggregate, which prevents further moisture from entering the aggregate.

Next, in step S5, cement is poured into the Miki tank, and in step s6, RtJI is carried out for about 3 to 4 minutes.

Since a water film has already formed on the surface of the aggregate, even when cement is added and mixed, the moisture in the cement does not penetrate into the aggregate, and the viscosity of the concrete is maintained at an appropriate value. I can do it. In addition, the viscosity between the aggregates and between the aggregate and cement particles increases due to the thickening effect of the thickener, so that aggregates with low specific gravity will not separate from the cement.

When the mixing is completed in this manner, in step S7, the mixed concrete is pumped to a concrete placement site using concrete pumping means having uniform pumping pressure, such as a Mono pump. At this time, as already mentioned, the viscosity between the aggregates and between the aggregate and cement particles increases due to the thickening effect of the thickener, so the aggregate and cement separate in the pumping pipe. Never.

For reference, Fig. 2 shows a comparison of a mixing example of the concrete used in the present invention with a conventional mixing example.
This blending example is just an example, and it goes without saying that various blends are possible.Furthermore, Fig. 3 shows the physical property values of the glass blowing agent-based aggregate used in the present invention, and Fig. 4 Figure 2 shows the physical properties of ultra-light insulating concrete based on the formulation shown in Figure 2 compared with the physical properties of ultra-light insulating concrete based on the conventional formulation. As can be seen from the figure, it is lighter and has better insulation performance than the conventional ultra-light insulation concrete 1. Although there are some differences in compressive strength as the strength of concrete, MJIiI
Insulating concrete is originally used for heat insulation and is not used as a structural member, so even if its strength is somewhat inferior, it is not a big problem.

However, it goes without saying that the present invention can also be applied to bone light porous aggregates that do not have water absorption properties, such as expanded polystyrene and expanded polystyrene. In this case, it is possible to prevent the separation of aggregate and cement from occurring during concrete pumping.

(g) 0 Effects of the Invention As explained above, according to the present invention, when pumping a mixture of ultra-light insulating concrete, aggregate is first added, and then an inorganic thickener is sprinkled on the aggregate. Furthermore, water and organic admixtures were added, and after mixing with water, cement was added.
! ! As a result, when the aggregate is mixed with cement, the surface of the aggregate is already covered with a water film that increases viscosity, preventing further water from entering the aggregate, and reducing the amount of water in the cement. ] is not absorbed into the aggregate, and the concrete maintains a good viscosity.

Moreover, since the thickener increases the viscosity between aggregates and between aggregate and cement particles, cement and aggregates do not separate during pumping, and the physical properties of concrete that is pumped are improved. It can be maintained in a uniform and good condition.

Moreover, when the concrete is pumped by a concrete pumping means having a uniform pumping pressure such as a mono pump, the pressure applied to the concrete in the pumping pipe is equalized, and the pressure applied to the concrete in the pumping pipe is equalized, and the pressure applied to the concrete in the pumping pipe is equalized. Extremely large pressure is not applied to the concrete unlike with other pressure pumps, and therefore there is no possibility that water in the cement will be absorbed by the aggregate in the concrete, causing blockage inside the pipe.

In addition, since a pressure pump can be used, the pouring of ultra-light insulating concrete can be done continuously instead of intermittent with conventional packets, making the pouring work as efficient as regular concrete. becomes possible.

[Brief explanation of drawings]

Fig. 1 is a flowchart showing an example of a method for kneading and pumping ultra-light insulating concrete according to the present invention, and Fig. 2 shows a mixing example of ultra-light insulating concrete used in carrying out the present invention compared to a conventional ultra-light insulating concrete mix. Figure 3 is a diagram showing the physical properties of the aggregate shown in Figure 2, which compares with the example.
FIG. 4 is a diagram comparing the physical properties of ultra-light insulating concrete based on the formulation shown in FIG. 2 with those of ultra-light insulating concrete based on a conventional formulation. 287

Claims (2)

[Claims] (1) In a method of kneading and pumping ultra-light insulating concrete, ultra-light insulating concrete is obtained by using a lightweight porous material with heat-insulating properties as aggregate and kneading the aggregate and an organic admixture with cement, At the time of kneading, first the aggregate is added and an inorganic thickener is sprinkled on the aggregate, then the organic admixture is added together with water and kneaded with water for a predetermined period of time, and then cement is added and kneaded. Further, there is provided a method for mixing and pumping ultra-light heat insulating concrete, comprising pumping the mixed concrete using a concrete pumping means. (2) The method for kneading and pumping ultra-light heat insulating concrete according to claim 1, characterized in that a pressure pump having a uniform pumping pressure is used as the means for pumping the concrete.