JP2001048627A - Hydraulic cement composition having expanding property and inorganic water stopping material using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hydraulic cement composition having expanding properties which can maintain cutoff properties without inhibiting a structural integration as a concrete member when the composition is applied to a connecting part of concrete. SOLUTION: The hydraulic cement composition having expanding properties is prepared by compounding (B) 5 to 20 pts.wt. hydrophilic organic solvent, (C) 5 to 25 pts.wt. nonionic surfactant, (D) 5 to 30 pts.wt. fine particle inorganic filler and (E) 1 to 15 pts.wt. cement expansion material and/or 2 to 30 pts.wt. inorganic expansion material in (A) 100 pts.wt. hydraulic cement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic cement composition having expandability and an inorganic water-blocking material using the same.

[0002]

2. Description of the Related Art In general, concrete used in civil engineering and building structures has a property in which cement undergoes a hydration reaction with the passage of time at the same time as the mixing water is added, and the cement goes from setting to hardening. However, since the volume is reduced during hardening, weak points are often generated at the joint between the pre-cast concrete and the post-cast concrete, which causes water leakage. Therefore, as a water stoppage treatment for the general concrete splicing part, that is, the construction splicing part, a water stop plate is embedded over the pre-cast concrete and the post-cast concrete, and the material that swells when the water channel is shut off or comes into contact with water is Water leakage is prevented by arranging it.

There is a so-called pre-installation method, in which a water-stopping material is disposed in advance on hardened pre-cast concrete and then post-cast concrete is poured. Soft materials such as water-swelling rubber, butyl rubber, and bentonite are often used as materials, but these water-stopping materials are sufficient for stopping water at joints. Since it contains a system material, its structural integrity is inevitably impaired.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an inflatable water which can secure water stoppage without impairing the structural integrity of a concrete member when it is disposed at a concrete joint. The purpose of the present invention is to provide a hard cement composition.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to develop a hydraulic cement composition having expandability, and as a result, a hydration reaction has occurred in the hydraulic cement as a main component. By using a hydrophilic organic solvent and a nonionic surfactant as a non-mixing solution, a clay-like hydraulic cement composition is obtained, and the mixing solution is replaced with water from the point of contact with water. The hydration reaction is initiated and thereby hardened, and the hydraulic cement composition is used in combination with a cement-based expansive material conventionally used for expansive concrete and / or an inorganic swelling having swelling properties It has been found that a hydraulic cement composition having expandability can be obtained by adding a material, and the present invention has been accomplished based on this finding.

That is, the present invention relates to (A) 100 parts by weight of hydraulic cement and (B) 5-20 hydrophilic organic solvents.
Parts by weight, (C) 5 to 25 parts by weight of a nonionic surfactant,
(D) 5 to 30 parts by weight of a particulate inorganic filler and (E) 1 to 15 parts by weight of a cement-based expanding material and / or an inorganic-based swelling material 2
The present invention provides an expandable hydraulic cement composition containing up to 30 parts by weight. The hydraulic cement composition having this expandability has no shrinkage due to the hydration reaction,
The strength of the hardened body exceeds the strength of concrete used for general structural members.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The hydraulic cement which is the component (A) of the composition of the present invention includes Portland cement, blast furnace cement, silica cement, fly ash cement,
Conventionally used hydraulic cements such as alumina cement, ultra-fast-setting cement, and colloid cement can be used.

Next, examples of the hydrophilic organic solvent as the component (B) include water-free polyethylene glycol and glycerin.

The component (B) is a component necessary as a kneading solution for obtaining a clay-like hydraulic cement composition, and further plays a role in controlling the rate of replacement with water. If the weight average molecular weight is too large, the solidification point becomes high and it becomes difficult to handle, and if the weight average molecular weight is small, the replacement with water is too fast and it is not possible to impart sufficient compressive strength at the time of curing Therefore, usually, the weight average molecular weight 150 ~
900, preferably in the range of 250-600.

As the nonionic surfactant of the component (C), any nonionic surfactant can be used as long as it is soluble in the polyalkylene glycol of the component (B). Those containing a polyoxyalkylene chain are particularly advantageous. Such nonionic surfactants include condensates of higher alcohols and polyalkylene oxides, such as condensates of octadecyl alcohol and 12 to 15 moles of ethylene oxide, condensates of oleyl alcohol and 7 to 9 moles of ethylene oxide, Condensates of monoglycerides of higher fatty acids with polyalkylene oxides, such as oleic acid, stearic acid, condensates of glycerides such as palmitic acid with 6 to 15 mol of ethylene oxide, condensates of sorbitan and esters of higher fatty acids with ethylene oxide, For example, sorbitan monoester or diester of coconut oil fatty acid and ethylene oxide 5-1
0 mol, a condensate of a higher alkylated phenol and ethylene oxide, such as a condensate of p-isooctylphenol with 5 to 10 mol of ethylene oxide or p-
There are condensates of isobutylphenol with 5 to 10 moles of ethylene oxide, condensates of polypropylene oxide and polyethylene oxide, and the like.

The components (B) and (C) in the present invention play a role as a plasticizer of the hydraulic cement of the component (A), and by blending them, a clay-like composition is formed. Is done. And in such a composition,
Formability and swellability are added by blending the fine particle inorganic filler of the component (D) and the cement-based expanding material and / or the inorganic swelling material of the component (E).

As the fine particle inorganic filler of the component (D), silica fume having a fineness of 8000 cm ² / g or more,
Silica-based fillers such as aerosil, talc, calcium carbonate and the like are used, and silica fume is particularly preferred. The component (D) is a component necessary particularly for smooth extrusion, and if it is omitted, extrusion cannot be performed. As the cement-based expanding agent (E), lime-based and calcium-sulfoaluminate-based swelling materials, and as the inorganic-based swelling material, bentonite, beidellite, nonterrorite, sepiolite, and the like containing montmorillonite as a main component may be used. Although it is possible, lime is particularly preferable.

In the composition of the present invention, component (A) 10
5 to 20 parts by weight of the component (B), 5 to 25 parts by weight of the component (C), 5 to 30 parts by weight of the component (D) and 1 to 15 parts by weight of a cement-based expanding material as the component (E) based on 0 part by weight. Alternatively, 2 to 30 parts by weight of the inorganic swelling material or both are blended. If the amounts of the component (B) and the component (C) are less than this, the moldability and the strength development during curing are adversely affected, so that the structural integrity is impaired, which is not practical. Next, if the amount of the component (D) is less than this, the moldability, especially the extrudability, deteriorates, and if it is more than this, the strength development after curing is adversely affected. Further, the component (E)
If the amount of the component for imparting the swelling property is smaller than this, the required swelling property cannot be obtained, so that sufficient water stopping property cannot be exhibited. Damages the surrounding concrete and impairs the structural integrity of the joint.

In the composition of the present invention, if necessary, a water-absorbing polymer can be blended as the component (F). By blending this water-absorbing polymer, it acts synergistically with the component (E) to further improve the water stoppage. Such a water-absorbing polymer can be arbitrarily selected from those known so far. Examples of such a water-absorbing polymer include a polyacrylic acid-based water-absorbing polymer, a modified polyvinyl alcohol-based water-absorbing polymer, a vinyl alcohol-acrylic acid copolymer-based water-absorbing polymer, an olefin-maleic anhydride copolymer-based water-absorbing polymer, and poly (N- Vinylacetamide) -based water-absorbing polymer. The component (F) is used in an amount ranging from 0.5 to 10 parts by weight per 100 parts by weight of the component (A).

In addition, the composition of the present invention may contain a binder, a reinforcing agent, a coloring agent, and the like commonly used in hydraulic cement compositions, as long as the essential physical properties are not impaired.
Water stoppage enhancers and the like can be added.

When the composition of the present invention is brought into contact with water, it undergoes a hydration reaction to harden, and at the same time, expands to compensate for the decrease in volume, so that it can be used as a waterproof material for concrete joints, pipe joints and the like. . When the composition of the present invention is used as a water-stopping material, the clay-like composition is rolled into a long shape with a water-permeable sheet and pressed into a necessary construction site, or the clay-like material is applied to a predetermined location. Then, mortar is poured and fixed. In addition, the composition of the present invention can be processed into a predetermined shape by extrusion molding or press molding, and applied to a water stop portion.

[0017]

Next, the present invention will be described in more detail with reference to examples.

EXAMPLE 1 100 parts by weight of ordinary Portland cement, 8 parts by weight of polyethylene glycol (molecular weight 400) and polyoxyethylene nonyl phenyl ether (nonionic surfactant)
8 parts by weight, 10 parts by weight of silica fume (fine particle inorganic filler) and 4 parts by weight of lime (cement-based expanding material) are kneaded,
A hydraulic cement composition having a clay-like expansive property was prepared. Next, this was extruded into a block having a thickness of 10 mm, a width of 40 mm, and a length of 1000 mm using an extruder. The extrudability at this time was good. When this molded product was cured and cured in water for 28 days while being in contact with water, the cured product expanded without cracking and had a compressive strength of 320 kgf / cm ² .

Example 2 To the same composition as in Example 1, 1 part by weight of poly- (N-vinylacetamide) [water-absorbing polymer; trade name NA-010, manufactured by Showa Denko KK] was added and kneaded. ,
An expandable hydraulic cement composition was prepared. Next, this was extruded into a block in the same manner as in Example 1. The extrudability at this time was good. When this molded product was cured and cured in water for 28 days while being in contact with water, the cured product expanded without cracking and had a compressive strength of 300 kgf / cm ² .

Comparative Example 1 A hydraulic cement composition having expandability was prepared by kneading 100 parts by weight of ordinary Portland cement, 20 parts by weight of polyethylene glycol (molecular weight: 400), 10 parts by weight of silica fume and 4 parts by weight of lime. . Next, this was extruded into a block in the same manner as in Example 1. The extrudability at this time was good. When this molded product was cured and cured in water for 28 days while being in contact with water, the cured product did not expand, and fine cracks were generated, and its compressive strength was 250 kgf / cm ² .

Comparative Example 2 100 parts by weight of ordinary Portland cement, 20 parts by weight of polyoxyethylene nonylphenyl ether, 10 parts by weight of silica fume and 4 parts by weight of lime were kneaded to prepare a clay-like cement composition. Next, this was extruded into a block in the same manner as in Example 1. The extrudability at this time was good. When this molded article was cured and cured in water by contact with water, the extraction of the nonionic surfactant was slow, and complete curing was not performed even after 28 days, resulting in numerous cracks.

Example 3 In the hydraulic cement composition of Example 1, except that 7 parts by weight of bentonite (inorganic swelling material) was used instead of lime, clay-like expansibility was measured in the same manner as in Example 1. A hydraulic cement composition was prepared. Next, this composition was extruded into a rectangular section having a thickness of 10 mm and a width of 40 mm using an extruder, and cut into a length of 1000 mm. Extrudability was good. When this molded product was cured and cured in water for 28 days while being in contact with water, the cured product expanded without cracking and had a compressive strength of 320 kgf / cm ² .

Example 4 The clay-like cement compositions obtained in Examples 1, 2 and 3 and Comparative Examples 1 and 2 were rolled into a poly (vinyl acetate-vinyl alcohol) film to have a thickness of 10 mm, a width of 20 mm and a length of 10
After making a 00 mm block, this was
When the cement composition obtained in the examples showed a water stopping property of 3 kgf / cm ² or more, all of the cement compositions obtained in the examples were compared with each other. None of the cement compositions obtained in the examples showed any water stopping properties.

[0024]

According to the present invention, when the clay-like composition is made into a clay-like composition with a kneading solution containing a hydraulic cement and a surfactant that does not contribute to the hydration reaction, when the clay-like composition comes into contact with water, Provided is a hydraulic cement composition capable of causing a hydration reaction by replacing a kneading solution with water. Further, by using a hydraulic cement and a cement-based expanding material and / or an inorganic-based swelling material in combination, a hydraulic cement composition having a novel expansive property, which compensates for hardening shrinkage caused by a hydration reaction, can be obtained. This can be suitably used as an inorganic water-stopping material that does not impair the water-stopping property and structural integrity of the joint part of the concrete structure.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C04B 22:06) 103: 40 103: 60 (71) Applicant 599112098 ITOCHU Systema Corporation Minato-ku, Tokyo (5-1) Inventor Katsuro Kokufu 5-3-3-104 Toyooka, Tama-shi, Tokyo (72) Inventor Naoto Watanabe 1-1-18 Kyobashi, Chuo-ku, Tokyo Inside CHI Kasei Co., Ltd. (72 ) Inventor Kazuhiro Takasaki 1-1-18 Kyobashi, Chuo-ku, Tokyo Inside C.I.Kasei Co., Ltd. (72) Kuniichi Amanuma 1-16-3 Miyanishi-cho, Fuchu-shi, Tokyo Inside Shin-A Master Corporation ( 72) Inventor Toru Nemoto 1-16-3 Miyanishi-cho, Fuchu-shi, Tokyo Shin-A Master Corporation (72) Inventor Masayuki Nakano 1-9-9 Wakabadai, Asahi-ku, Yokohama-shi, Kanagawa Earth 406 F term (reference) 2E001 DA01 DA05 FA30 GA03 GA07 GA24 HA01 JA01 JA06 JD02 MA08 4G012 PA06 PA28 PB12 PB15 PB16

Claims (5)

[Claims] (A) 5 to 20 parts by weight of a hydrophilic organic solvent, (C) 5 to 25 parts by weight of a nonionic surfactant, and (D) inorganic fine particles with respect to 100 parts by weight of hydraulic cement. 5 to 30 parts by weight of filler and (E) cement based expander 1 to 1
An expandable hydraulic cement composition comprising 5 parts by weight and / or 2 to 30 parts by weight of an inorganic swelling material. 2. The expandable hydraulic cement composition according to claim 1, wherein the nonionic surfactant (C) is a polyoxyalkylene-based nonionic surfactant. 3. The polyoxyalkylene-based nonionic surfactant is at least one selected from polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether and polyoxyethylene sorbitan fatty acid ester. A hydraulic cement composition having expandability. 4. The expandable hydraulic cement composition according to claim 1, further comprising (F) 0.5 to 10 parts by weight of a water-absorbing polymer per 100 parts by weight of the component (A). . 5. An inorganic water-blocking material comprising the hydraulic cement composition having expandability according to any one of claims 1 to 4.