JPH0226882A - Method for packing aerated mortar - Google Patents

Abstract

PURPOSE:To pack aerated mortar into a vessel without leaving a gap by charging the aerated mortar contg. a prescribed volume percentage or more of air bubbles into the vessel set in a pressure chamber, applying a prescribed pressure or above to reduce the volume of the mortar and returning the pressure to atmospheric pressure to expand the mortar. CONSTITUTION:A vessel to be packed with aerated mortar is set in a pressure chamber, aerated mortar contg. >=40vol.% air bubbles is charged into the vessel and <=0.2kgf/cm<2> pressure is applied to the chamber to compress the air bubbles in the mortar. After the compressed state is held for a prescribed time, e.g., 10min, the pressure is returned to atmospheric pressure to expand the mortar. The air bubbles carry well through the vessel and the vessel can be perfectly packed with the aerated mortar.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for filling a container with cellular mortar, and more particularly to a method for filling a container with cellular mortar without any gaps.

Conventional Technology Conventionally, cellular mortar has been commonly used as a filling material for containers because of its excellent fluidity and no material separation, but it requires appropriate expandability in order to completely fill even the smallest voids. has been done. For this reason, in many cases, foam mortar is mixed with AI powder, etc., and the expanding force of the generated gas is utilized.

In addition to the problems that the invention attempts to solve, such A1. Foam mortar in which powder is mixed is easily affected by temperature and other factors, and has disadvantages such as unstable expansion. There is also a method that utilizes the hydration expansion of the material itself, but this method has a small expansion coefficient and is not sufficient.

For this reason, in this conventional method of filling with foam mortar, the foam mortar is not sufficiently filled into the partitions of the container, leaving spaces that often result in defects in product strength, insulation, etc. It was seen.

Therefore, an object of the present invention is to solve such problems in the prior art, and to fill a container with foam mortar in a compressed state in a pressure chamber so that the container is sufficiently filled with foam mortar. An object of the present invention is to provide a method for filling foam mortar in which air bubbles are expanded by being released into atmospheric pressure.

Means for Solving the Problem In order to achieve the above-mentioned object, according to the present invention, a foam mortar filling method is provided in which a container to be filled with foam mortar is placed in a pressure chamber, and a volume ratio of 40% or more is provided. A foam mortar containing air bubbles of
It is characterized by the step of keeping the volume of the injected foam mortar in a compressed state by pressurizing it at kgf/cm2 or less, and releasing it to atmospheric pressure after a predetermined time to expand the volume of the foam mortar.

Accordingly, the present invention uses the above-mentioned means to place a container to be filled with foam mortar in a pressure chamber, inject a predetermined amount of foam mortar into the container, and then pressurize the pressure chamber to a predetermined pressure to drain the contents of the foam mortar. To fully fill a container with cellular mortar by keeping the bubbles in a compressed state and then releasing them to atmospheric pressure after a predetermined period of time to expand the bubbles so that the bubbles are sufficiently spread to every corner of the container. I can do it.

The foam mortar filling method of the present invention will be explained in detail below based on experimental examples and examples.

In the cellular mortar filling method of the present invention, in the case of cellular mortar containing many bubbles, it is efficient to utilize the volume change of the cellular portion. Bubble volume changes depending on temperature and atmospheric pressure, but experiments have shown that changes in atmospheric pressure cause volume changes most quantitatively. Next, an experimental example will be shown.

50011 in an approximately 50cz square container with a viewing window on the front.
Place the graduated cylinder No. 1, fill it with foam mortar of the composition shown in the table below, and place a buoy on the surface. Next, the atmospheric pressure in the pressure vessel was increased little by little, and changes in the buoy were read to measure changes in volume. As a result of the measurements, it was found that the volume change of the foam mortar corresponded linearly with the change in air pressure with high precision. In addition, when the change in atmospheric pressure is small, the volume restores better when the pressure is reduced after pressurization, and when the change in pressure is 0.2
When exceeding kgf/cz2, a defoaming phenomenon was observed due to release, and the expansion of the foam mortar appeared to be slightly smaller.

In the foam mortar filling method of this invention, the composition of the foam mortar used is the foam volume of 4001/3 (cell ratio: 4001/3).
0%) or more, and the appropriate water-cement ratio is 45-65%.
When the amount of bubbles is less than this, the amount of expansion is small, and when the water-cement ratio is outside this range, the uniformity of the material may be impaired, making it difficult to obtain a sufficient effect.

Implementation Exception wall dimensions 40X40X40CI, inner wall dimensions 37X37X
An injection hole was provided at one end of the upper part of a 37 cz double-walled iron container, and air vent holes were provided at three locations at the other end. Approximately 21 mortar reservoirs were provided in the injection hole, and this container was placed in the pressure chamber.

As foam mortar, foaming agent Hiform (trade name, ingredient: higher alcohol sulfonic acid triethanolamine salt) is used in cement milk with a water-to-cement ratio of 55%, and the air bubbles obtained through a foaming nozzle are mixed in a volume ratio of 3 = 7. and thoroughly mixed with a hand mixer. The weight per unit volume of this foam mortar was 0.57Ag/&, and the foam content was 71%, but the specific gravity was 0.57 (air foam content was 71%).
) Gently pour the foam mortar from the injection hole of the container and check that the foam mortar overflows from each air vent hole.
Furthermore, the mortar reservoir was replenished with about 21 bubble mortar to bring the pressure inside the pressure chamber to 0.1 atm. Then about 10
After a few minutes, the pressure chamber was released, the injection hole and the air vent hole were both covered and closed, and the mixture was left for one week. After the foamed mortar had completely hardened, each section was cut to check the state of filling of the foamed mortar in each section, and it was confirmed that the entire beam was completely filled with the foamed mortar.

Effects of the Invention As described above, when backfilling a double-walled structure such as a steel product such as a fireproof safe, there are many corners, which tend to be incompletely filled. However, according to the foam mortar filling method of this invention, the pressure chamber In this pressure chamber, bubble mortar is injected into the container and pressurized, and then it is released to atmospheric pressure to increase the mortar volume to m.
By expanding the foam, the filling properties of the foam mortar are significantly improved, and the foam mortar can sufficiently spread to every corner of the container, making it possible to completely fill the container with the foam mortar. It can be widely applied to any product with a complex structure.

Claims (1)

[Claims] A container to be filled with foam mortar is placed in a pressure chamber, and foam mortar containing bubbles with a volume ratio of 40% or more is injected into the filling area of the container, and the pressure chamber containing the container filled with foam mortar is closed. It is characterized by the process of maintaining the volume of the injected foam mortar in a compressed state by pressurizing it at 0.2 kgf/cm^2 or less, and releasing it to atmospheric pressure after a predetermined time to expand the volume of the foam mortar. Foam mortar filling method.