JP2002316860A - Adhesive for mortar concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an adhesive for mortar concrete which has excellent initial appearing properties of adhesive strength between a porous concrete board and a normal concrete (or mortar) board, and can produce a concrete large-sized flat board suitably usable, e.g. as a flat board for a precast pavement in a short time. SOLUTION: This adhesive from mortar concrete consists of rapid-curing cement containing a 100 pts.mass hydraulic material, a 0 to 300 pts.mass fine aggregate, a 0.1 to 2.0 pts.mass (expressed in terms of a solid content) water- reducing admixture and 15 to 30 pts.mass water. The hydraulic material consists of a 20 to 60 mass% clinker essentially consisting of calcium sulfoaluminate, a 20 to 70 mass% Portland cement clinker, a 0.5 to 30 mass% anhydrous gypsum, 0.1 to 3.0 mass% carbonate of an alkali metal and 0.05 to 4.0 mass% organic acid. Also, the molar ratio of SO3 /Al2 O3 is 1.0 to 1.4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive for mortar concrete used for bonding mortar and hardened concrete to each other, and is particularly suitable for bonding hardened porous concrete to hardened ordinary concrete (or mortar). Adhesive for mortar concrete.

[0002]

2. Description of the Related Art Porous concrete blocks have been put to practical use as pavements for sidewalks and parking lots, because drainage of rainwater is improved. In recent years, a porous concrete block having both excellent water permeability and large bending strength has been developed, and application to a road with heavy traffic has been studied.
For example, Japanese Unexamined Patent Publication No. 9-87053 discloses an immediately deporous concrete molding having a large bending strength and a good water permeability.

[0003]

In the future, in order to use porous concrete extensively in applications such as pavement materials for roads with heavy traffic, it is necessary to construct large-sized flat plates such as precast pavement flat plates. However, when porous concrete is formed into a large flat plate such as a precast pavement flat plate, it does not have sufficient handling strength (strength enough to be transported to a laying site and withstand construction), and cracks and the like may occur during construction. There is.

[0004] Therefore, it is necessary to bond the porous concrete plate and the ordinary concrete (or mortar) plate and integrate them to increase the handling strength.
It is an important task to develop an adhesive capable of increasing the bonding strength between a porous concrete plate and a normal concrete (or mortar) plate.

In view of such circumstances, the present invention provides a large-sized concrete flat plate which is excellent in early development of adhesion strength between a porous concrete plate and a normal concrete (or mortar) plate and which can be suitably used as a flat plate for precast pavement. It is an object of the present invention to provide an adhesive for mortar concrete that can be manufactured by the method described above.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, if an adhesive material for mortar concrete is used which has a specific material and a specified mixing ratio. The present invention has been found to be capable of producing a large-sized concrete flat plate which is excellent in early development of adhesion strength between a porous concrete plate and a normal concrete (or mortar) plate and can be suitably used as a flat plate for precast pavement or the like in a short time. Is completed.

That is, the present invention comprises 100 parts by mass of hydraulic material, 0 to 300 parts by mass of fine aggregate, 0.1 to 2.0 parts by mass (in terms of solid content) of a water reducing agent, and 15 to 30 parts by mass of water. An adhesive for mortar concrete, wherein the hydraulic material is 20 to 60% by mass of clinker containing calcium sulfoaluminate as a main component, 20 to 70% by mass of Portland cement clinker, 0.5 to 30% by mass of anhydrous gypsum, alkali metal Carbonate of 0.1-3.0
%, Organic acid 0.05 to 4.0% by mass, and SO ₃ / A
An adhesive for mortar concrete, characterized by being a fast-setting cement having an l ₂ O ₃ molar ratio of 1.0 to 1.4 (claim 1).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The materials constituting the adhesive for mortar concrete of the present invention and the compounding ratio thereof are as follows. (1) Hydraulic material As a hydraulic material, clinker containing calcium sulfoaluminate as a main component is 20 to 60% by mass, Portland cement clinker is 20 to 70% by mass, anhydrous gypsum is 0.5 to 30% by mass,
0.1 to 3.0 mass% of alkali metal carbonate, 0.05 to 4.
A quick-setting cement consisting of 0% by mass and having a SO ₃ / Al ₂ O ₃ molar ratio of 1.0 to 1.4 is used.

In the adhesive for mortar concrete of the present invention, the use of the hydraulic material has fluidity up to about 60 minutes after kneading, thereby ensuring good workability. A bond strength of 1.0 N / mm ² or more can be developed within 6 hours after application of the material.
If the type and mixing ratio of the components of the hydraulic material (rapid-setting cement) deviate from the above-mentioned conditions, the time having fluidity is too short to ensure sufficient workable time,
It is not preferable because there are inconveniences such as a decrease in workability, a failure in early development of adhesive strength, and a decrease in long-term strength development of the adhesive itself.

The types and mixing ratios of the components of the hydraulic material (quick-setting cement) of the present invention are described in more detail below. A clinker containing calcium sulfoaluminate as a main component is a component for imparting early and long-term adhesive strength. The mixing ratio of the clinker in the hydraulic material is 20 to 60% by mass. When the blending ratio of the clinker is less than 20% by mass, the early development of the adhesive strength and the long-term development of the strength are inferior, and when it exceeds 60% by mass, the cost increases and the workability decreases.

[0011] Portland cement clinker is added to reduce cost, improve workability, and the like. The proportion of Portland cement clinker in the hydraulic material is 20
It is about 70% by mass. If the blending ratio of Portland cement clinker is less than 20% by mass, the above objects such as cost reduction cannot be sufficiently achieved.
The early and long-term strengths of adhesion strength are reduced.
As the Portland cement clinker, for example, ordinary Portland cement clinker is preferably used.

In the present invention, in order to further improve the workability of the adhesive for mortar concrete and the early and long-term development of adhesive strength, two types of particles having a specific particle size within a specific numerical range are used. Preferably, anhydrous gypsum is present. To give an example of a preferred embodiment, anhydrous gypsum is partially clinker (clinker containing calcium sulfoaluminate as a main component and Portland cement clinker)
When pulverized, it is mixed with the clinker and pulverized.
It can be configured so as to be added later in a coarse powder state having a Blaine specific surface area of 3000 cm ² / g or less. In this case, a clinker consisting mainly of calcium sulfoaluminate, and Portland cement clinker, the crushing of the mixture consisting of a part of anhydrite, and preferably no greater 4000~12000cm ² / g in Blaine specific surface area Done in

[0013] Other examples of preferred embodiments, anhydrous gypsum is partially, which is added in a fine powder state of Blaine specific surface area 4000~12000cm ² / g, the balance, Blaine specific surface area of 3000 cm ² / g It can be configured to be added in the following coarse powder state. In this case, in order to make a part of the anhydrous gypsum into a fine powder state, a method of pulverizing separately from pulverization of the clinker may be adopted. However, it is preferable to grind with clinker, because the work efficiency is improved. In anhydrous gypsum, the proportion of anhydrous gypsum that is mixed with a clinker and ground or added in a fine powder state is 45 to 75% by mass, preferably 55 to 65% by mass, and anhydrous gypsum added in a coarse powder state is used. The proportion of gypsum is 25-55% by mass, preferably 35
~ 45% by mass. Incidentally, anhydrite added in coarse powder state is preferably Blaine specific surface area of 1500~3000cm ² / g, more preferably 2000~2800cm ² / g.

The mixing ratio of anhydrous gypsum in the hydraulic material is 0.1%.
5 to 30% by mass. If the mixing ratio of the anhydrous gypsum is less than 0.5% by mass, the operable time cannot be sufficiently ensured, and the workability also decreases. If it exceeds 30% by mass, the early development of the adhesive strength decreases.

An alkali metal carbonate is added in order to improve the early development of adhesion strength. Specific examples of the alkali metal carbonate include lithium carbonate, sodium carbonate, potassium carbonate and the like. Among them, it is preferable to use lithium carbonate from the viewpoint of early development of adhesion strength at a low temperature and workability. Alkali metal carbonate can be used as long as it has a Blaine specific surface area of 2000 cm ² / g or more.
Those having a specific surface area of at least 3000 cm ² / g are preferable, and 4
More preferably, it is from 000 to 12000 cm ² / g.

The compounding ratio of the alkali metal carbonate in the hydraulic material is 0.1 to 3.0% by mass. When the mixing ratio of the alkali metal carbonate is less than 0.1% by mass, the early development of the adhesion strength is reduced, and when it exceeds 3.0% by mass, the strength development is reduced.

The organic acid is added to secure a workable time. As the organic acid, oxycarboxylic acid and the like are preferable. Examples of oxycarboxylic acids include citric acid, lactic acid, glycolic acid, gluconic acid, trioxybutyric acid, heptonic acid, tartaric acid, and the like. Among them, citric acid and / or heptonic acid are preferably used.

The mixing ratio of the organic acid in the hydraulic material is 0.05
~ 4.0% by mass. If the compounding ratio of the organic acid is less than 0.05% by mass, the operable time cannot be sufficiently secured,
If it exceeds 4.0% by mass, the early development of the adhesive strength is reduced.

SO in hydraulic material (quick-setting cement)
Molar ratio of ₃ / Al ₂ O ₃ is 1.0 to 1.4. If the molar ratio of SO ₃ / Al ₂ O ₃ is less than 1.0, the workability of the adhesive decreases, and if the molar ratio exceeds 1.4, the early development of the adhesive strength decreases.

(2) Fine aggregate The fine aggregate includes river sand, sea sand, mountain sand, crushed sand, or a mixture thereof. In the present invention, fine aggregate is
From the viewpoint of workability of the adhesive for mortar concrete, those having a maximum particle size of 2.5 mm or less are preferable, and those having a maximum particle size of 1.5 mm or less are more preferable. The amount of the fine aggregate is 0 to 300 parts by mass, preferably 20 to 200 parts by mass, more preferably 30 to 150 parts by mass with respect to 100 parts by mass of the hydraulic material (quick-setting cement). By adding fine aggregate, shrinkage due to drying after curing can be suppressed. If the amount of the fine aggregate exceeds 300 parts by mass, the workability of the adhesive is deteriorated, and the adhesive strength is undesirably reduced.

(3) Water reducing agent As the water reducing agent, a lignin-based, naphthalenesulfonic-acid-based, melamine-based, polycarboxylic acid-based water reducing agent, an AE water reducing agent, a high performance water reducing agent or a high performance AE water reducing agent is used. Can be. The amount of the water reducing agent is 0.1 to 2.0 parts by mass in terms of solids, preferably 0.2 to 1.5 parts by mass in terms of solids, based on 100 parts by mass of the hydraulic material (quick-setting cement). If the amount of the water reducing agent is less than 0.1 part by mass, it is not preferable because the operable time cannot be sufficiently secured and the operability is reduced. If the amount of the water reducing agent exceeds 2.0 parts by mass, the adhesive strength is undesirably reduced. The water reducing agent can be used in either liquid or powder form.

(4) Water The amount of water is 15 to 30 parts by mass, preferably 16 to 28 parts by mass, per 100 parts by mass of the hydraulic material (rapidly hardening cement). If the amount of water is less than 15 parts by mass, it is not preferable because the operable time cannot be sufficiently secured and the operability decreases. If the amount of water exceeds 30 parts by mass, the adhesive strength is undesirably reduced.

(5) Inorganic powder In the adhesive for mortar concrete of the present invention, in order to improve workability, blast furnace slag powder, fly ash, limestone powder, silica stone powder are added to 100 parts by mass of the hydraulic material. It is preferable to contain at least 50 parts by mass of at least one inorganic powder selected from the group consisting of: Among them, a preferred inorganic powder is fly ash. If the amount of the inorganic powder exceeds 50 parts by mass, the adhesive strength is undesirably reduced.
The Blaine specific surface area of the inorganic powder is preferably from 3000 to 10000 cm ² / g in terms of availability and workability of the adhesive.

[0024] In mortars for concrete adhesive of the present invention, the workability of the adhesive material preferably has a flow time of J ₁₄ funnel 3 to 15 seconds, more preferably from 4 to 12 seconds. The kneading method and kneading apparatus for the adhesive for mortar concrete of the present invention are not particularly limited,
A conventional method and a conventional mixer may be used. In addition,
In the adhesive for mortar concrete of the present invention, a cement admixture such as an antifoaming agent or a thickener may be added as long as the object of the present invention is not impaired.

Next, a method for bonding a porous concrete plate and a normal concrete (or mortar) plate using the adhesive for mortar concrete of the present invention will be described. In order to bond the porous concrete plate and the ordinary concrete (or mortar) plate, the adhesive for mortar concrete of the present invention is applied to the ordinary concrete (or mortar).
It may be applied to one surface of the plate (the surface to be bonded to the porous concrete plate), and the porous concrete plate may be bonded thereon before the mortar concrete adhesive hardens. Here, the type of the porous concrete plate is not particularly limited. Further, the type of the ordinary concrete (or mortar) plate is not particularly limited.

The method of applying the adhesive for mortar concrete of the present invention to ordinary concrete (or mortar) boards is not particularly limited, and any conventional method can be used. The thickness of the adhesive layer formed after the application is 1 to 40 mm, preferably 1 to 10 mm, more preferably 1 to 5 mm from the viewpoint of reduction in work and cost. In addition, the surface of the ordinary concrete (or mortar) plate to which the adhesive for mortar concrete of the present invention is applied is to be subjected to a pretreatment for removing a latence layer or a thin paste layer and forming a rough surface having irregularities in advance. Is preferred. The pretreatment can be performed by, for example, a method of brushing using a wire brush, a method of spraying wet sand, or the like.

[0027]

The present invention will be described below with reference to examples. 1. Materials used (1) Hydraulic material Hydraulic material A Hydraulic material A used in Examples 1 to 3 was prepared as follows. 37.5% by mass of calcium sulfoaluminate-based clinker, 46.8% by mass of ordinary Portland cement clinker and 14.3 × 0.6% by mass of anhydrous gypsum are mixed to obtain a Blaine specific surface area of 4%.
After grinding to 500 cm ² / g, was added 14.3 × 0.4 wt% lithium 1.0 weight% carbon anhydrite and 0.4 wt% citric acid Blaine specific surface area of 2500 cm ² / g, by mixing, hydraulic material A
I got The molar ratio of SO ₃ / Al ₂ O ₃ in the hydraulic material A is:
It was 1.18. Hydraulic material B As the hydraulic material B, an early-strength Portland cement was used.

(2) Materials other than hydraulic materials The following materials were used. High-performance water reducing agent; Mighty 150 (Kao Corporation) Fine aggregate; Hosomeyama sand from Ichigen (particle size 2.5 mm or less) Water: Tap water inorganic powder; Fly ash (Kanden Kako Co., Ltd.)

2. Mixing and Kneading of Mortar Concrete Adhesive Using the above materials, an adhesive for mortar concrete was prepared according to the composition shown in Table 1. The kneading was performed for 60 seconds using a hand mixer (0.01 m ³ ).

[0030]

[Table 1]

3. Preparation of Specimen A hardened φ10 cm concrete cylinder specimen (100 parts by mass of ordinary Portland cement, 280 parts by mass of fine aggregate (Ichihara's fine grain sand of 2.5 mm or less)), coarse aggregate (crushed stone of Ome 6)
No.) 284 parts by mass, a high-performance water reducing agent (Mighty 150 (manufactured by Kao Corporation)) 1.0 part by mass (in terms of solid content) and a mixture of 50 parts by mass of water are kneaded into a φ10 × 20 cm mold. After being compacted at a vibration frequency of 3000 vpm and then cured in air at 20 ° C. for 7 days (compressive strength: 40 N / mm ² ), the upper surface of the surface is brushed and washed to form a latence layer on the surface. Was removed to obtain a rough surface having irregularities. After applying the adhesive of Table 1 thereon to form an adhesive layer having a thickness of 5 mm, a φ10 × 20 cm porous concrete cylindrical specimen was immediately adhered, and the mixture was left in the air at 20 ° C. for 9 hours and 7 days. After curing, a specimen in which porous concrete and ordinary concrete were bonded and integrated was produced.

As the porous concrete specimen, 100 parts by mass of early-strength Portland cement, 50 parts by mass of fine aggregate (Hosameyama sand from Ichihara (particle size: 2.5 mm or less)), coarse aggregate (crushed stone No. 6 from Ome) ) A kneaded mixture obtained by mixing 400 parts by mass, a high-performance water reducing agent (Mighty 150 (manufactured by Kao Corporation)) 1.0 part by mass (in terms of solid content) and 25 parts by mass of water so that the porosity is 18%. After compacting at 3000vpm at 3 ℃ at 20 ℃
Those that were cured in the air for days were used. The bending strength of the porous concrete specimen is 4.5 N / mm ² , and the water permeability is 0.2 cm / sec.
Met.

4. Evaluation methods and results 1) to measure the flow time of J ₁₄ funnel flowability each mortar concrete adhesive. 2) Workability The workability at the time of applying each mortar concrete adhesive was evaluated as "◎: very good", "○: good", "x: bad".
Was evaluated. 3) Adhesion strength After the preparation of the specimens, the adhesion strength of each specimen was measured according to “JIS A 6909.
(Architectural finishing coating material) ". Table 2 shows the results.

[0034]

[Table 2]

From Table 2, it can be seen that the mortar concrete adhesive specified in the present invention has a good workability and a good performance.
Within 1.0 hours, an adhesive strength of 1.0 N / mm ² or more was developed.

Example 4 100 parts by weight of early strength Portland cement, 50 parts by weight of fine aggregate (Hosameyama sand from Ichihara (particle size: 2.5 mm or less)), 400 parts by weight of coarse aggregate (crushed stone No. 6 from Ome), high Performance water reducing agent (Mighty 150
(Manufactured by Kao Corporation)) 1.0 parts by mass (solid content conversion) and 25 water
The kneaded material kneaded in a mixing ratio of parts by mass is put into a 3.0 × 3.5 × 0.2 (height) m formwork, compacted at a vibration frequency of 3000 vpm so as to have a porosity of 18%, and then cooled to 20 ° C. For 3 days in the air to obtain a porous concrete plate. Also, 100 parts by mass of ordinary Portland cement, 280 parts by mass of fine aggregate (Ichihara's Hosomeyama sand (2.5 mm or less in diameter)), coarse aggregate (crushed stone from Ome 6)
No.) 284 parts by mass, a high-performance water reducing agent (Mighty 150 (manufactured by Kao Corporation)) 1.0 part by mass (in terms of solid content) and a mixture of 50 parts by mass of water and a mixture of 3.0 × 3.5 × 0.2 (high M) After casting in a m formwork and compacting at a vibration frequency of 3000 vpm,
Cured in the air at ℃ for 7 days to obtain a normal concrete plate. By brushing and washing the upper surface of the ordinary concrete plate, the latence layer on the surface was removed to obtain a rough surface having irregularities. The adhesive of Example 3 in Table 1 was applied thereon, and an adhesive layer having a thickness of 5 mm was formed.
After curing in the air for one day, a flat plate for precast pavement was prepared.

When a construction experiment was performed using the above-mentioned precast pavement flat plate, no cracks or the like occurred during the construction.

[0038]

As described above, the adhesive for mortar concrete according to the present invention is excellent in early development of adhesion strength between a porous concrete plate and a normal concrete (or mortar) plate, and is suitable as a flat plate for precast pavement and the like. A large-sized concrete flat plate that can be used for manufacturing can be manufactured in a short period of time.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C04B 24:06 C04B 14:06 Z 14:06 18:08 Z 18:08 18:14 A 18:14 14:28 14 : 28 14:04 Z 14:04 24:18 A 24:18 24:20 24:20 24:22 A 24:22 24:04 24:04) 111: 00 111: 00 (72) Inventor Tatsuzo Sato Chiba 2-4-2 Daisaku, Sakura, Japan F-term in Central Research Institute Co., Ltd. F-term (reference) 4G012 MB33 PA03 PA04 PA10 PA27 PA29 PB08 PB12 PB16 PB17 PB23 PB24 PB25 PC03 PC04 PC05 PC06 PC11 PC12 PD02 PD03 PE04 4J040 AA011 BA232 HA126 HA192 HA251 HA252 HA26 HA331 HA332 HA366 HB24 HC25 HD13 KA03 KA42 MA06 NA12

Claims (4)

[Claims] 1. 100 parts by mass of hydraulic material, 0-300 fine aggregate
Parts by weight, 0.1 to 2.0 parts by weight of water reducing agent (in terms of solid content), and water
An adhesive for mortar concrete containing 15 to 30 parts by mass, wherein the hydraulic material is 20 to 60% by mass of a clinker containing calcium sulfoaluminate as a main component, 20 to 70% by mass of Portland cement clinker, and anhydrous gypsum. 0.5-30 mass%, alkali metal carbonate 0.1-3.0 mass%, organic acid 0.05-4.0
An adhesive for mortar concrete, characterized in that it is a fast-setting cement consisting of 1% by mass and having a SO ₃ / Al ₂ O ₃ molar ratio of 1.0 to 1.4. 2. A part of the anhydrous gypsum in the hydraulic material,
The mixture is ground together with the clinker containing calcium sulfoaluminate as a main component and the Portland cement clinker.
^{2. The} adhesive for mortar concrete according to claim 1, which is added later in a coarse powder state of 3000 cm ² / g or less. 3. A part of the anhydrous gypsum in the hydraulic material,
It is added in the form of fine powder having a specific surface area of 4000 to 12000 cm ² / g, and the remainder is a specific surface area of 3000 cm ² / g
The mortar concrete adhesive according to claim 1, which is added in a coarse powder state of not more than g. 4. The method according to claim 1, wherein at least one kind of inorganic powder selected from blast furnace slag powder, fly ash, limestone powder, and silica stone powder is contained in an amount of 50 parts by mass or less based on 100 parts by mass of the hydraulic material. The adhesive for mortar concrete according to any one of the above.