JPH07148728A - Packaging body for underwater not disaggregative chemical admixture - Google Patents

Abstract

PURPOSE:To prevent dust from developing at the charging of chemical. admixture and contrive to quickly mix the chemical admixture with chemical admixture to be charged together with the cement and the aggregate in a mixer is packed by packaging body made of water-soluble film at the manufacturing of special underwater concrete in a plant. CONSTITUTION:In order to build a structure under water, special underwater concrete is employed. In order to manufacture the special underwater concrete in a plant, underwater not disaggregative chemicaladmixture is charged together with cement and aggregate in a mixer. In this case, since no standing private port of the admixture is provided, the admixture is charged by a worker. However, dust develops at the charging of the admixture, resulting in deteriorating the working environment of the worker. To cope with the deterioration, the admixture is packed with packaging body made of water-soluble film. In addition, heat sealability is given to the water-soluble film. Furthermore, the water- soluble film is selected from the group consisting of polyalkylene oxide, polyvinyl alcohol, polyvinyl pyrrolidone and their derivatives.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package for an underwater inseparable admixture, and in particular, packaging an underwater inseparable admixture so that no dust is generated when it is put into a concrete production plant and quickly. The present invention relates to a package for an underwater non-separable admixture, which is crushed and can sufficiently mix an underwater non-separable admixture with a concrete material, and which does not adversely affect the properties of the resulting underwater non-separable concrete.

[0002]

2. Description of the Related Art In recent years, in various civil engineering and construction works,
Special underwater concrete is used to build structures underwater. When manufacturing this underwater concrete in a conventional concrete manufacturing plant, while adding cement, aggregate, etc. into the mixer of the plant or immediately after adding it, after adding the underwater non-separable admixture into the mixer and mixing, water, etc. Is added and kneaded. By the way, in a concrete manufacturing plant in recent years, commonly used powder such as cement is input from a dedicated input port to a mixer, and it is not necessary for an operator to directly input the powder. However, since the water-separable admixture does not always have a dedicated inlet, the worker directly puts the water-separable admixture into the mixer during the production of the water-separable concrete. Since this inseparable admixture in water is a powder, dust is generated when it is put into a mixer of a concrete manufacturing plant, which has been a problem in working environment. In addition, a dust discharge device was required to maintain a good working environment.

By the way, a container containing various compounding materials to be added to a conventional concrete material, the container itself being opened, crushed and dispersed in the cement slurry while being added and stirred in the cement slurry, As a package configured such that the compounding agents and the like contained therein are added to the cement slurry, a package made of various poorly water-soluble or water-soluble materials has been proposed (JP-A-3-272808). JP-A-5-9900).

[0004]

However, there has hitherto been no proposal for a package for water-inseparable concrete.

The object of the present invention is to prevent dust from being generated when it is put into a plant for producing concrete, to promptly destroy the package, to mix the water-separable admixture with the concrete material, and to obtain the properties of fresh concrete. And a package that does not adversely affect the properties of concrete after curing.

[0006]

In order to solve the above problems, the present invention provides a package for an inseparable admixture in water comprising a water-soluble film.

Further, it is preferable that the water-soluble film has a heat-sealing property.

Further, it is preferable that the water-soluble film is a film made of at least one selected from polyalkylene oxide, polyvinyl alcohol, polyvinylpyrrolidone and derivatives thereof.

The water-inseparable admixture package for an admixture of the present invention (hereinafter referred to as "the package of the present invention") will be described in detail below.

In the present invention, the underwater non-separable concrete is made by adding an underwater non-separable admixture to the concrete so as to give the concrete viscous property, so that the concrete does not separate in the water and does not easily disperse in the water. Concrete with properties. This underwater non-separable concrete is a powder whose main component is a water-soluble polymer as an underwater non-separable admixture. This inseparable admixture in water is roughly classified into cellulose type and acrylic type. Cellulosics include, for example, those containing HPMC (hydroxypropylmethylcellulose), HEMC (hydroxyethylmethylcellulose), HEC (hydroxycellulose), and acrylics include, for example, partial hydrolysis of polyacrylamide. object,
Examples thereof include those containing a copolymer of acrylamide and sodium acrylate. Specific examples of the water-separable admixture include those marketed under the trade name: Hydrocrete UWB by Mitsui Ishikasan Co., Ltd.

The package of the present invention comprises a water-soluble film. Examples of the water-soluble film include at least one water-soluble film selected from polyalkylene oxide, polyvinyl alcohol, polyvinyl pyrrolidone, water-soluble cellulose such as methyl cellulose and hydroxypropyl cellulose, partial hydrolyzate of polyacrylamide, and derivatives thereof. Examples thereof include films made of a volatile substance. Further, in the present invention, among the films made of a water-soluble substance, a water-soluble film having heat sealability is preferable. Examples of the heat-soluble water-soluble film include polyalkylene oxide, polyvinyl alcohol, polyvinylpyrrolidone and their derivatives. In addition to these water-soluble substances, the water-soluble film may contain, for example, silica powder, filler such as calcium carbonate, powder such as cement, and the like. Further, the water-soluble film may be a film having a single-layer structure or a laminated film having two or more layers made of the same or different water-soluble substance. Since the water-soluble film has a surface-active effect, when mixed in ordinary concrete or the like, slump may increase and strength may decrease as the amount of air increases. However, the underwater non-separable concrete is usually mixed with a defoaming agent and the like, so that the amount of air does not increase and the strength does not decrease.

The thickness of the water-soluble film forming the package of the present invention is such that the package rapidly crushes when it is put into a mixer for a concrete manufacturing plant, and the water-separable admixture and other concrete materials are used. Is preferably 5 to 80 μm, more preferably 15 to 50 μm so that the package does not break during storage and transportation.

The production of this water-soluble film is not particularly limited and can be carried out according to a conventional method. For example,
It can be performed according to a casting method, a melt extrusion method, or the like.

The package of the present invention is formed by appropriately molding a water-soluble film depending on the amount of the inseparable admixture in water held therein, the ease of handling, the carrying form, and the like.
The package may be any bag, box, or the like having a shape of a sphere, a regular tetrahedron, a cube, a rectangular parallelepiped, a cylinder or the like, and is not particularly limited. The capacity of the package is appropriately determined depending on the type of the inseparable admixture in water, the capacity of the applied mixer, and the like. Usually, it is about 0.2 to 10 liters, and it is preferably about 0.5 to 6 liters in consideration of easiness of handling, the amount of addition per one time and the like.

The package of the present invention can be manufactured according to a method of bonding a water-soluble film by heat sealing, a method of bonding with an adhesive, a method of stitching or the like. In particular, the heat sealing method is preferable in that the quality of the obtained underwater non-separable concrete is not adversely affected by mixing components other than predetermined components into the underwater non-separable concrete.

The package of the present invention contains an underwater inseparable admixture for storage and transportation, is put into a mixer or the like together with other underwater inseparable concrete material, and is quickly crushed to be submerged in water. The non-separable admixture can be subjected to mixing with other in-water non-separable concrete materials.

[0017]

EXAMPLES Examples and comparative examples of the present invention will be given below.
The present invention will be specifically described.

Example 1 0.56 g (area: 174 cm ² ) of polyethylene oxide film having a thickness of 30 μm (Flexine manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) was folded in two,
Both ends were heat-sealed to produce an admixture packaging bag having an opening at one end. Into this admixture packaging bag, 106 g of a powdery in-water non-separable admixture (Hydrocrete UWB, manufactured by Mitsui Kasei Co., Ltd.) was placed, and the bag opening was heat-sealed to obtain Created a packaging pack.

Next, a concrete material equivalent to 45 liters having the composition shown in Table 1 was prepared, and among them, liquid water and materials other than the fluidizing agent were charged into the concrete mixer, and then the water-separable admixture packaging pack was prepared. Put one, 3
I kneaded it for 0 seconds. At this time, generation of dust due to the powder of the non-separable admixture in water was not observed at the time of charging and during kneading.

(Comparative Example 1) Of the concrete materials having the composition shown in Example 1, water other than liquid and a material other than a fluidizing agent were charged into a concrete mixer, and then a powdery water-separable admixture (Mitsui 106 g of Hydrocleat UWB manufactured by Petrochemical Co., Ltd. was added, and the mixture was kneaded for 30 seconds. At this time, generation of dust was observed at the time of adding the powdery non-separable admixture in water and at the initial stage of empty kneading.

(Example 2) Similar to Example 1, materials other than water and a fluidizing agent, which are liquids, and a packaging pack of an inseparable admixture in water were put into a concrete mixer and kneaded. The amounts of water and superplasticizer (indicating the amount per 45 liters of concrete material) shown in 1 were added and kneaded for 90 seconds to prepare an inseparable concrete in water.

The underwater non-separable concrete obtained was subjected to compressive strength and slump flow according to the test method described in the Japan Society of Civil Engineers Standard “Standard for water-inseparable admixture for concrete (draft)” (issued in May 1991). The change with time, the amount of air, the turbidity, and the setting time were measured. The compressive strength test was conducted according to JIS A1108 (concrete compressive strength test method) at each age of 7 days and 28 days. The size of the test piece is 10 cm in diameter and 20 cm in height, and the test atmosphere is of two kinds in water and in gas. For each test material age, the same kind of test piece made from concrete of each batch is used. The number was three. The slump flow test was carried out in accordance with the Japan Society of Civil Engineers Standard “Slump Flow Test Method for Concrete (Draft)” and the slump flow was measured 5 minutes after the slump cone was pulled up. The slump flow changes over time
The slump flow was measured 2 hours and 4 hours after the concrete was kneaded. The air volume test is based on JIS
A 1128 (testing method by pressure of air amount of concrete not yet solidified (air chamber pressure method)) was performed once for each batch of concrete. The turbidity and setting time tests were carried out according to Annex 1 of JIS A 6204 (concrete setting time test method), and the number of test pieces produced from each batch of concrete was one. On the other hand, an underwater non-separable concrete using only the underwater non-separable admixture instead of the packaging pack of the underwater non-separable admixture was prepared in the same manner, and a physical property test was conducted. The results are shown in Table 2.

As a result, the underwater non-separable concrete prepared using the packaging pack of the underwater non-separable admixture was added to the underwater non-separable admixture as it was without putting it in the packaging bag after the fresh state and after curing. It was found that the same performance as that of the non-separable concrete prepared in water was obtained.

(Example 3) Experiment No. The amount of polyethylene oxide film shown in 2 was used to make a packaging pack of the water inseparable admixture. Next, using the packaging pack of the underwater non-separable admixture, an underwater non-separable concrete was prepared in the same manner as in Example 2 and subjected to a physical property test. The results are shown in Table 2.

As a result, in the case of using the packaging pack of the inseparable admixture in water, which was packaged with a film made of polyethylene oxide in an amount three times the required amount (Table 2, Experiment N).
o. 4) Even, the underwater non-separable concrete obtained is
It was found that, in the fresh state and after curing, it exhibits the same performance as the underwater non-separable concrete prepared by adding the underwater non-separable admixture as it is without putting it in the packaging bag (Table 2, Experiment No. 1). .

(Example 4) Experiment No. 2 in Table 2 A packaging pack of the inseparable admixture in water was prepared by using the amount of polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., Hycelon) in the amount shown in FIG. Next, using the packaging pack of the underwater non-separable admixture, an underwater non-separable concrete was prepared in the same manner as in Example 2 and subjected to a physical property test. The results are shown in Experiment N of Table 2.
o. 5 shows. As a result, even when the packaging pack of the water-separable admixture packaged with a film made of polyvinyl alcohol was used (Table 2, Experiment No. 5), the obtained water-separable concrete had a fresh state and after curing. It was found that the same performance as that of the underwater non-separable concrete (Table 1, Experiment No. 1) prepared by adding as it was without adding the underwater non-separable admixture was obtained.

(Comparative Example 2) A concrete material having an ordinary composition shown in Table 3 was prepared in an amount corresponding to 45 liters, and among them, liquid water, materials other than AE water reducing agent and superplasticizer,
A packaging pack of the water-separable admixture prepared by using the amount of polyethylene oxide film shown in Table 4 was placed in a concrete mixer and kneaded for 30 seconds. further,
With the formulation shown in Table 3, water, an AE water reducing agent and a superplasticizer were added, and the mixture was kneaded with a concrete mixer for 90 seconds to prepare a non-separable concrete in water, and physical properties were examined in the same manner as in Example 1. . On the other hand, the concrete composition was kept the same, and the concrete without mixing the packaging pack of the inseparable admixture in water was kneaded to examine the physical properties. The results are shown in Table 4.

As a result, the setting time has little effect when Flexine is added to ordinary concrete.
However, slump, the amount of air increased, and the compressive strength decreased in the concrete to which Flexine was added. When the amount of flexine added was increased, the effect on the physical properties became even greater.

[0029]

[Table 1]

[0030]

[Table 2]

[0031]

[Table 3]

[0032]

[Table 4]

[0033]

INDUSTRIAL APPLICABILITY The underwater inseparable admixture package of the present invention is a powder for packaging an underwater inseparable admixture into a mixer of a concrete production plant during the production of underwater inseparable concrete. The non-separable admixture in water can be directly added without removing it from the bag.

Therefore, when the package of the present invention is used for packaging an inseparable admixture in water, the following effects can be obtained. (1) The underwater non-separable admixture can be packaged in a predetermined amount according to the adjustment of the concrete composition, and the time and effort of weighing at the time of use can be saved. In addition, the water-separable admixture does not spill or scatter during operation, and management is easy. (2) Since the package is dispersed in concrete, it is not necessary to treat the package. (3) The constituent substances of the package are uniformly dispersed in the concrete, and the cured concrete is not adversely affected.

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Claims (3)

[Claims] 1. An underwater inseparable admixture package comprising a water-soluble film. 2. The package for an inseparable admixture in water according to claim 1, wherein the water-soluble film has a heat-sealing property. 3. The water-insoluble admixture according to claim 1, wherein the water-soluble film is a film made of at least one selected from polyalkylene oxide, polyvinyl alcohol, polyvinylpyrrolidone and derivatives thereof. Packaging.