JP3182156B2 - Hydraulic material and hydraulic injection material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic material, and more particularly, to a hydraulic injection material for repairing fine cracks such as ground injection and cracks in concrete structures.

[0002]

2. Description of the Related Art Conventionally, epoxy resin-based or cement-based materials have been used as an injection material. However, epoxy resin-based materials are expensive, and long-term durability is sufficient if water is present inside concrete cracks. But cement-based
There were problems such as containing particles over 88μ and insufficient injectability.

As a method for solving the above-mentioned problem, an injection material for repairing fine powder comprising blast furnace slag, gypsum, and Portland cement clinker has been proposed. However, the initial setting is very slow, and leakage and strength development after crack injection are considered. (JP-A-63-206346).

The present inventors have conducted various studies to solve the above-mentioned problems. As a result, by using a material having a specific composition and particle size, the injection property is good, there is no leakage after the injection, and the short- and long-term strength development is achieved. The inventors have found that an excellent injection material can be obtained, and have completed the present invention.

[0005]

Means for Solving the problems] That is, the present invention is calcium silicate 5 to 40 _{wt%, 3CaO · 3Al 2 O 3} · CaSO 4 3~1
5% by weight , gypsum 3-15 % by weight , and blast furnace slag 50-8
And also contains a 9 wt%, the maximum particle size of below 32Myu, and a hydraulic injection material following particle 12μ is 50 wt% or more, further, gypsum 3CaO · 3Al ₂ O ₃ · CaSO to ₄
50 to 150% by weight of the hydraulic injection material.
You.

Hereinafter, the present invention will be described in detail.

The calcium silicate according to the present invention is
3CaO.SiO ₂ and / or 2CaO.SiO ₂ , 3CaO.SiO ₂ or 2Ca
Various Portland cement clinkers containing ordinary, fast, ultra-fast, and moderate heat containing O ・ SiO ₂ , various portland cements made by adding gypsum to Portland cement clinker, and siliceous substances added to these portland cements Various mixed cements and the like can also be used. The particle size of calcium silicate has a maximum particle size of 32.
It is preferable that particles having a particle size of not more than μ and not more than 12 μm are not less than 50% by weight.

The 3CaO.3Al ₂ O ₃ .CaSO ₄ (hereinafter referred to as “auin”) according to the present invention is obtained by firing various raw materials so that the fired product becomes 3CaO.3Al ₂ O ₃ .CaSO _4. Any of crystalline and amorphous materials can be used, but an amorphous material which is solidified without being crystallized while maintaining a glass state is preferable in terms of strength development and long-term stability. 50% by weight of particles with a maximum particle size of 32μ or less and 12μ or less
It is preferable that it is above.

The gypsum is not particularly limited, but type II anhydrous gypsum is preferred. As for the particle size of the gypsum, it is preferable that the maximum particle size is 32 μm or less, and the particles having a maximum size of 12 μm or less are 50% by weight or more.

The blast furnace slag according to the present invention may be a blast furnace slag obtained by cooling a slag by-produced from a blast furnace of an ironworks. In particular, a blast furnace slag which is made amorphous by rapid cooling such as water cooling or air cooling. Use is preferred. The vitrification rate of the amorphous slag is preferably 80% or more, and the basicity is 1.5%.
The above are preferred in terms of strength development. The particle size of the blast furnace slag is such that the maximum particle size is 32μ or less and the particles
It is preferred that the content be at least 10% by weight.

The mixing ratio of calcium silicate is 5 to 40% by weight, auin is 3 to 15% by weight, gypsum is 3 to
15% by weight, and 50-89% by weight of blast furnace slag. If the calcium silicate content is less than 5% by weight, short- and long-term strength development is poor, and if it exceeds 40% by weight, the viscosity increase of the hydraulic injection material increases, and the preferred range is 10 to 30% by weight.
Also, poor initial setting properties is less than the amount of Auin 3 wt%, and cause problems such as leakage, more than 15% by weight, too fast initial setting, problems arise in the injection property. Further, it is preferable that the gypsum is mixed with 50 to 150% by weight of the eauin from the viewpoint of short- and long-term strength. Blast furnace slag
If it is less than 50% by weight, the change in viscosity is large, and if it exceeds 89 % by weight, short- and long-term strength development is poor .

The hydraulic injection material of the present invention has a maximum particle size of 32 μm.
Or less, more preferably 16 μm or less. Also, 12μ
The following particles are preferably 50% by weight or more, and 70% by weight or more are more preferable from the viewpoint that the injectability of the ground and the injectability into the few cracks of the concrete structure are good and the integration of the ground and the concrete structure can be measured. .

In the present invention, the method of pulverizing the hydraulic injection material is not particularly limited. However, each material is separately pulverized by a pulverizer such as a ball mill, and a material having a size of 32 μm or less is collected by classification, and then mixed. Alternatively, any method can be used in which each material is mixed and then pulverized to collect 32 μ or less by classification. However, when each material is mixed and then crushed and classified, the mixing ratio may change due to a difference in specific gravity of each material, and in consideration of the mixing ratio, each material is separately crushed and classified, and then A method of mixing is preferred.

It is preferable to use a setting modifier in the hydraulic injection material of the present invention in order to maintain workability.

Examples of the setting regulator include inorganic compounds such as boric acid, phosphoric acid, and silicofluoride or a salt thereof; citric acid;
Oxycarboxylic acids such as tartaric acid and gluconic acid or salts thereof can be used. The effect is great if the coagulation regulator and the alkali carbonate are used in combination.

It is preferable to further mix a high performance water reducing agent or a fluidizing agent with the hydraulic injection material of the present invention from the viewpoint of increasing the dispersibility of the hydraulic injection material and improving the injection property. It is preferable to mix a latex such as an ethylene-vinyl acetate polymer (EVA) or a styrene-butadiene rubber (SBR) from the viewpoint of improving adhesion after injection and preventing settling of the paste.

Uses of the hydraulic injection material of the present invention include:
Repair and injection of cracks in concrete structures, injection of general soil, acidic soil, bedrock, and the like are possible.

[0018]

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

Example 1 A paste of 100 parts by weight of hydraulic injection material, 400 parts by weight of water, and 2 parts by weight of a high performance water reducing agent shown in Table 1 was kneaded. Meanwhile, 1 kg of No. 6 silica sand was placed in a φ5 cm tube of the Japan Society of Civil Engineers,
It was filled so as to be 34 cm, and 200 cc of the paste was poured therein. The penetration depth and the remaining amount of the hydraulic injection material remaining on the silica sand were measured as the thickness. Table 2 shows the results.

In addition, the 4
Compressive strength was measured on a specimen of × 4 × 16 cm. Furthermore, φ
The paste was poured into a 5 cm tube of the Japan Society of Civil Engineers up to a height of 20 cm, and the amount of breathing after 3 hours was measured as height. The results are also shown in Table 2.

[0021]

[Table 1]

[0022]

[Table 2]

<Materials Used> Cement: Ordinary Portland cement manufactured by Denki Kagaku Kogyo Co., Ltd., 90% of particles having a maximum particle size of 16 μm and 12 μm or less Aouin: 80% particles made of Denki Kagaku Kogyo Co., Ltd. having a maximum particle size of 16 μm and 12 μm or less Akita Gypsum Type II anhydrous gypsum, maximum particle size 16
80% particle slag of μ, 12μ or less: Granulated blast furnace slag manufactured by Kobe Steel, maximum particle size 16
91% particles of μ or 12μ or less High performance water reducing agent: trade name “FT-500” manufactured by Denki Kagaku Kogyo Co., Ltd. Main component β-naphthalenesulfonic acid formaldehyde condensate

[0024]

By using the hydraulic injection material of the present invention, the injection property is greatly improved. Short- and long-term strength expression can be improved. The chemical resistance is improved. There is a shrinkage reducing effect. It produces effects such as:

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI E02D 3/02 101 E02D 3/02 101 E04G 23/02 E04G 23/02 B // C04B 111: 72 (56) References JP JP-A-57-166345 (JP, A) JP-A-63-206346 (JP, A) JP-A-53-21219 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C04B 28 / 08 C04B 22/08 C04B 22/14 C04B 28/16

Claims (2)

(57) [Claims] 1. Calcium silicate 5-40% by weight , 3C
_{aO · 3Al 2 O 3 · CaSO} 4 3~15 wt%, gypsum 3-15 weight
% , And 50 to 89% by weight of blast furnace slag, and has a maximum particle size of 32 μm or less and particles of 12 μm or less are 50% by weight or more. 2. Gypsum is 3CaO ・ 3Al _Two O _Three ・ CaSO _Four 50 for
2. The hydraulic injection material according to claim 1, wherein said material is contained in an amount of from 150 to 150% by weight.
Fees.