KR20010100789A - Ultra-rapid-hardening non-contractive grout material - Google Patents

Abstract

An object of the present invention is to provide an ultra-speed hard non-shrinkable grout material capable of achieving rapid hardening, non-shrinkage and workability even with high fluidity, without generating material separation or bleeding. It is a super fast-hard non-shrink grout material which contains g or more fast hardening materials and expansion materials. Moreover, it is preferable that a fast hard material contains calcium aluminate, and an expandable material contains calcium sulfur aluminate. Moreover, when mix | blending a water-soluble cellulose ether, favorable workability can be obtained. The fresh mortar of the super-hard, non-shrink grouting material has a J ₁₄ funnel dropping value of 2 to 5 seconds, a yield value of 10 to 40 Pa, a plastic viscosity of 0.5 to 3.0 Pa · s, and a compressive strength of the cured product after 2 hours of 10 N / It has physical properties of 2 mm 2 or more.

Description

ULTRA-RAPID-HARDENING NON-CONTRACTIVE GROUT MATERIAL}

The present invention relates to a super-speed hard non-shrink grout material mainly used in emergency construction, cold district construction, etc. in the field of civil engineering and construction.

In general, the grout material is used for the pre-concrete concrete method, the mechanical base filling, the steel plate reinforcing filling, etc., and requires good filling properties and high fluidity. In addition, the grout material has a problem that it is necessary to satisfy not only the filling property but also the practical strength in a short time in a construction requiring a limited construction time, such as a road. In addition, it is required to be non-shrinkable in order to prevent peeling of the filled grout material and steel sheet and dimensional stability in the mechanical basis.

However, the conventional ultra-high speed hard grout material has a problem in that material separation and bleeding are likely to occur when the high-flow rigidity is made high, and the strength is low (for example, Japanese Patent Laid-Open No. 12-34154, etc.). Moreover, there existed a subject that it was not suitable for the construction of the inclination part which has a gradient, such as a road and the surface.

As a result of earnestly examining these problems, the present inventors can achieve fast hardening, non-shrinkability, and workability by a super fast hardening shrinkage grout material containing a specific fastening material and an expanding material without high material flowability or material separation or bleeding. It has been found that the invention can be completed to complete the present invention.

That is, the present inventors (1) ultra-fast hard non-shrink grout material comprising a fastening material and an expanding material having a specific surface area of 4000 cm2 / g or more, (2) the fastening material contains calcium aluminate, and the expanding material contains calcium sulfur aluminate. consisting of (1) per second rigid non-shrink grout material of (3) Further, the initial velocity rigid non-shrink grout material, and (4) of the mortar J ₁₄ fresh (fresh) of the water-soluble cellulose obtained by blending a polyether in (1) or (2) The yield value of the superhard hardening shrinkage grout material as described in any one of (1)-(3) characterized by the above-mentioned funnel falling-value is 2-5 second, and (5) fresh mortar, and baking viscosity is 0.5-3.0 (1) The compressive strength of the super fast-hard non-shrinkable grout material according to any one of (1) to (3), and the cured product after 2 hours of age (6), wherein the compressive strength is 10 N / mm 2 or more. As described in any one of (3) to It is a super fast hardening grout material.

Hereinafter, the present invention will be described in more detail.

The hardwood material used in the present invention is not particularly limited, but it is preferably made of crystalline or amorphous calcium aluminate and gypsum, and producing ettringite by a hydration reaction. Here, calcium aluminate is composed of CaO and Al ₂ O _{3, which} are obtained by mixing a raw material containing calcia and a raw material containing alumina, and performing heat treatment such as kiln firing or electric furnace melting. It is a generic term for properties having hydration activity. Specifically, 3 CaOAl ₂ O ₃ (C ₃ A), 12CaO 7Al ₂ O ₃ (C ₁₂ A ₇ ), 5CaO ₃ Al ₂ O ₃ (C ₅ A ₃ ), CaOAl ₂ O ₃ ( Crystalline calcium aluminates such as CA) and CaO.2Al ₂ O ₃ (CA ₂ ), and amorphous calcium aluminates of compositions corresponding thereto. Among them, the amorphous calcium aluminate preferably has a molar ratio (C / A) of CaO and Al ₂ O ₃ of 1.0 to 2.0, more preferably 1.6 to 1.8.

In addition, a 11CaO · 7Al ₂ O containing a halogen element _{3 · CaF 2 (C 11 A} 7 CaF 2), 3CaO · 3Al 2 O 3 · CaF 2 (C 3 A 3 CaF 2) or an alkali metal such as sodium, potassium Calcium aluminate containing can also be used.

The limes include anhydrous lime, hemihydrate lime and dihydrate lime, and among them, the use of anhydrous lime is preferable in view of fastness. The amount of lime used is preferably 50 to 300 parts based on 100 parts of calcium aluminate (hereinafter, "part" indicates a weight unit).

Although the usage-amount of a fast hardwood material is not specifically limited, 5-50 parts is preferable with respect to 100 parts of cement, and when less than 5 parts, the effect is small, and even if it exceeds 50 parts, the improvement of the effect cannot be expected.

The particle size of the fast hard material is preferably at least 4000 cm 2 / g, more preferably at 4000 to 9000 cm 2 / g, and even more preferably at 5000 to 7000 cm 2 / g. If the particle size of the fast hard material is less than 4000 cm 2 / g, sufficient fast hardness cannot be expected, and even if it is used exceeding 9000 cm 2 / g, the improvement of the effect cannot be expected and it is uneconomical.

The expandable material used in the present invention is not particularly limited, but is mainly composed of a mineral salt calcium calcium aluminate represented by 3CaO ₃ Al ₂ O ₃ CaS0 ₄ (C ₃ A ₃ CaS0 ₄ ), Ethrinite is produced, glass lime (CaO) is a main component, and Ca (OH) ₂ is produced by a hydration reaction.

1-15 parts are preferable with respect to 100 parts of cement, and, as for the usage-amount of an expanded material, 5-10 parts are more preferable. If it is less than 1 part, the effect of non-shrinkage is small, and if it exceeds 15 parts, expansion amount may be large and it may expand.

The particle size of the expandable material is usually about 2000-3000 cm 2 / g of the specific surface area, but the particle size of the expanded material of the present invention is preferably at least 4000 cm 2 / g, more preferably 4000-9000 cm 2 / g, more preferably 5000-7000 2 cm / g is more preferable. If the particle size of the expandable material is less than 4000 cm 2 / g, material separation may occur or long-term durability may deteriorate, and even if it exceeds 9000 cm 2 / g, the improvement of the effect cannot be expected and it is uneconomical.

In the present invention, in order to reduce the amount of water used to increase fluidity, admixtures such as generally used water reducing agents, high performance water reducing agents, high performance AE water reducing agents, and fluidizing agents are added. For example, the condensate of polyalkylaryl sulfonate, the condensate of naphthalene sulfonate, the condensate of lignin sulfonate, polycarboxylate, etc. are mentioned, One or two or more of these can be used. The use form may be either liquid or powder.

The amount of the admixture used is preferably 0.1 to 5 parts based on 100 parts of cement. If it is less than 0.1 part, the effect is small, and even if it uses more than 5 parts, the improvement of the effect cannot be expected and it is uneconomical.

Although the cement used by this invention is not specifically limited, Usually, various portland cements, such as a crude steel and a crude steel, and various mixed cements which added fly ash or blast furnace slag to these portland cements are mentioned.

The super fast shrinkage-free grouting material of the present invention is usually produced by mixing sand and water in cement, fastening material, expanding material and admixture. The cement / fine aggregate ratio of the ultra-shrink non-shrink grout material is usually in the range of 1 / 0.5 to 1/3, and the water / binder ratio, which is the ratio of water to the binder composed of cement, fast-hardening material and expanding material, is usually 30-50%. Although a range is preferable, it adjusts by external factors, such as air temperature and water temperature, and target year of a required.

Although the kneading | mixing of the superhard diameter non-shrink grout material of this invention is not specifically limited, A grout mixer, a high speed hand mixer, a forced stirring mixer, etc. are used, The mortar kneaded and finished is supplied to a construction site by pump press etc.

The adjustment of the usable time (working time) of the ultra-fast shrinkage grouting material of the present invention is performed by adding a coagulation delay agent. The coagulation retardant (hereinafter referred to as a retardant) is not particularly limited, but an inorganic salt such as sodium borate or sodium carbonate, or an organic acid such as gluconic acid, tartaric acid or citric acid or a salt thereof is usually used.

As for the usage-amount of a retardant, 0.1-5 parts is preferable normally with respect to 100 parts of cement. If it is less than 0.1 part, the effect is small, and when it exceeds 5 parts, an ultrafast diameter non-shrink grout material may not harden | cure.

Fluidity (referring to the mortar does not yet unconsolidated) per second path non-shrink grout material fresh mortar of the present invention is not particularly limited, J funnel ₁₄ flows down the value of 2 to 5 seconds is preferable, and a material separation occurred in less than 2 seconds In some cases, the strength expression may be lowered, and if it exceeds 5 seconds, the filling property may deteriorate.

Construction of the superhard mirror non-shrink grouting material of the present invention is performed at various places such as flat portions and inclined portions. In the construction of the flat portion, only the injectability of the superfast diameter non-shrink grout material needs to be taken into account. However, in the inclined portion having a gradient, deflection may occur and may not be uniformly filled. In this invention, in order to suppress this sag, it is preferable to mix | blend a water-soluble cellulose ether (henceforth simply a cellulose ether).

Although the cellulose ether used by this invention is not specifically limited, It is a thing which has a property to disperse | distribute to water rapidly and to raise a viscosity immediately after reacting with the alkali in cement, specifically, The thing whose main component is methylcellulose, hydroxypropyl methylcellulose, etc. is mentioned.

The amount of cellulose ether used is preferably 0.001 to 0.05 parts, more preferably 0.005 to 0.02 parts based on 100 parts of cement. If it is less than 0.001 part, there is a risk of sagging in the mortar, and if it exceeds 0.005 part, it may be a filling failure or a curing failure.

Although it does not specifically limit as a method of adding a cellulose ether to an ultra-fast shrink-free grout material, It is preferable to add a cellulose ether to water beforehand, and mix and mix with slurry-water. In addition, it is also possible to dry blend cellulose ether with cement, a fast hard material, an expanded material, and fine aggregate beforehand, and to mix with water at the time of construction.

The superhard diameter non-shrink grout material of the present invention preferably has a yield value of 10 to 40 Pa and a plastic viscosity of 0.5 to 3.0 Pa · s, which is a rheology constant of fresh mortar, in terms of filling properties and workability. 20-30 Pa and a baking viscosity of 1.0-2.0 Pa * s are more preferable. When yield value and plastic viscosity out of these ranges, filling property and workability may worsen.

By adding cellulose ether to the ultra-hard, non-shrink grouting material of the present invention, it is possible to increase the yield value without giving much change in the plastic viscosity, to impart thixotropic properties to the fresh mortar, and to improve pump transportability and workability. Moreover, it is preferable to mix | blend and adjust the usage-amount of a cellulose ether according to the gradient and shape of a city factory.

The super fast shrinkage-free grouting material of the present invention expresses 10 N / mm 2 or more in the compressive strength of the cured product after 2 hours of kneading, so that, for example, it reaches its practical strength 2 hours after construction is completed. It is possible to provide a construction that is economically reasonable, such that it can be opened in a normal state.

EXAMPLE

Hereinafter, although an Example demonstrates this invention still in detail, it is not limited to these.

Example 1

As shown in Table 1, the amount and particle size of the fastener and the expander for 100 parts of cement were changed as shown in Table 1, and 0.6 part of the admixture, 0.3 part of the retardant, and 135 parts of the fine aggregate were mixed with water / (binder = cement + fastener + expander). ), Water was added so that the ratio was 40%, and kneaded using a high speed hand mixer to prepare an ultrafast hard non-shrink grout material. The bleeding, consistency and handing time of the fresh mortar, the dimensional change rate of 7 days of aging and the compressive strength of 2 hours of aging were measured. The results are shown in Table 2.

<Used Material>

Cement: Common Portland Cement, Commercial

Fast hard material: 150 parts of anhydrous lime mixed with 100 parts of amorphous calcium aluminate of C / A (molar ratio) = 1.7 manufactured by using calcium oxide and alumina as a raw material, melted in an electric furnace, and then quenched. The particle size was adjusted by pulverizing this.

Expanding material: The commercial item whose main component is a Blaine specific surface area of 2800cm <2> / g of calcium sulfur aluminate. The particle size was adjusted by pulverizing this.

Admixture: High performance water reducing agent of naphthalene sulfonic acid system, commercially available product

Retardant: Commercial item whose main ingredient is organic acid

Sand: lime sand less than 5㎜

Water: Tap Water

<Measurement method>

Blaine specific surface area: measured according to JIS R 5201.

Consistency: Based on the measurement of consistency by the J funnel (J ₁₄ funnel) of the Concrete Institute Concrete Standard Specification (JSCE-F541), the flow rate value was measured.

Dimensional change rate: Measured according to JIS A 6202 (B), the dimensional change rate of 7 days old.

Compressive strength: According to the concrete standard specification (JSCE-G522) of the Society of Civil Engineers, measured after 2 hours.

Bleeding: The bleeding amount was measured according to the Concrete Standard Specification (JSCE-G533).

Time available: Visually judged (the time from kneading until fluidity disappears)

Formulation No. Sok Gyeongjae Inflating material Usage (part) Particle size (㎠ / g) Usage (part) Particle size (㎠ / g) ABCD 025025 -5500-3500 0055 --28003500 EFGH 25252525 5500550055005500 5555 4000500070009000 IJKL 25252525 4000500070009000 5555 6000600060006000 MNOP 5252550 5500550055005500 151015 6000600060006000

Experiment No. Formulation No. Bleeding Amount (cm 3 / ㎠) J ₁₄ funnel flow rate (sec) 7-Dimensional Change Rate (× 10 ^-6 ) Available time (minutes) 2 hours compressive strength (N / mm2) Remarks 1-11-21-31-4 ABCD 0.600.250.450.15 2.63.02.72.9 -80-60 + 950 + 880 2403818041 010.008.4 Comparative Example Comparative Example 1-51-61-71-8 EFGH 0000 3.03.13.63.7 + 720 + 680 + 630 + 570 35343330 12.813.514.214.3 EXAMPLE EXAMPLE EXAMPLE EXAMPLE 1-91-101-111-12 IJKL 0000 2.83.34.14.6 + 550 + 580 + 710 + 760 40363025 12.513.114.414.5 EXAMPLE EXAMPLE EXAMPLE EXAMPLE 1-131-141-151-16 MNOP 0000 2.83.24.14.8 + 310 + 420 + 850 + 970 45392420 10.812.014.815.1 EXAMPLE EXAMPLE EXAMPLE EXAMPLE

From Table 2, the fresh mortar of the superhard hard non-shrink grout material containing the fastening material and the expansion material of the above-mentioned Blaine specific surface area of 4000 cm 2 / g or more showed good fluidity with a J ₁₄ funnel flow rate of 5 seconds or less and no bleeding. The rate of dimensional change is non-shrinkable on the expansion side, and it can be seen that the compressive strength of the cured product of 2 hours is good, at least 10 N / mm 2.

Example 2

Formulation No. of Table 1 In the G hardwood and the expandable material, the same ratio as in Example 1 was performed except that the C / A molar ratio of calcium aluminate of the hardwood material and the mixing ratio of anhydrous lime were changed as shown in Table 3. The results are shown in Table 4.

Formulation No. C / A molar ratio of calcium aluminate Mixing of hardwood materials (part) Calcium Aluminate Anhydrous lime QRGS 1.01.41.72.0 100100100100 150150150150 TUV 1.71.71.7 100100100 50200300

Experiment No. Formulation No. Bleeding Amount (cm 3 / ㎠) J ₁₄ funnel flow rate (sec) 7-Dimensional Change Rate (× 10 ^-6 ) Available time (minutes) 2 hours compressive strength (N / ㎡) Remarks 2-12-21-72-32-42-52-6 QRGSTUV 0000000 2.73.33.53.43.63.43.2 + 480 + 600 + 630 + 580 + 320 + 550 + 490 75613724203953 10.412.514.211.110.711.310.6 Example Example Example Example Example Example Example Example

From Table 4, the one with respect to the calcium aluminate in 100 parts of hardwood C / A molar ratio of 1.0 to 2.0 of the present invention is 50 to 300 parts of non-suseokhoe formulation per second rigid non-shrink grout material fresh mortar is ₁₄ J funnel falling value It can be seen that the fluidity is good at 5 seconds or less, there is no bleeding, the dimensional change rate is non-shrinkage on the expansion side, and the compressive strength of the cured product of 2 hours is good at 10 N / mm 2 or more.

Example 3

Formulation No. of Table 1 The ultrafast hard non-shrink grout material similar to Example 1 was produced except having added the cellulose ether of the quantity shown in Table 5 with respect to 100 parts of cement using the G hard material and expansion material.

As a model test, a rough aggregate having a maximum particle diameter of 40 mm was laid on a 10 × 10 × 40 cm mold according to JIS A 1106, and the mold was inclined so that the overall gradient was 55/1000. In the case of injection from the higher side, J ₁₄ funnel flow rate value, usable time, yield value and plastic viscosity were measured, and sag and filling condition after demolding were confirmed. The results are shown in Table 5.

<Used Material>

Cellulose ether: Commercial item of methyl cellulose system

<Measurement method>

Yield Value, Plastic Viscosity: Rheological Constant, Murata, Suzuki, A Study on the In-Pipe Flow of Grout Mortar Along Slip on the Wall, Measurement Using a Gradient Grout Viscometer as described in the Journal of Civil Engineers, No.384

Charging situation: Spring with snow

Sag: Spring with snow

Experiment No. Cellulose ether (part) J ₁₄ funnel flow rate (sec) Available time (minutes) Yield Value (Pa) Plastic viscosity (Pas) Charging status Deflection Remarks 1-73-13-23-3 00.0010.0050.05 3.53.94.14.8 37413541 11.316.725.530.1 1.050.961.081.31 Good good good good good Yes Little Yes No EXAMPLE EXAMPLE EXAMPLE EXAMPLE

In Table 3, it can be seen that by adding cellulose ether, the fresh mortar of the ultrafast hard shrinkage grouting material of the present invention exhibits good filling properties and a sag suppressing effect.

Example 4

Formulation No. of Table 1 Using G hardwood and expander, 100 parts of cement, 30 parts of fastener, 5 parts of expander, 0.5 part of admixture, 0.8 part of retarder, and 140 parts of fine aggregate were added, so that the water / binder ratio was 40%. Then, the mixture was kneaded with a high speed hand mixer to prepare an ultrafast hard non-shrink grout material A. In addition, 0.005 parts of cellulose ether were blended with 100 parts of cement to prepare an ultrafast hard non-contracting grout material B having a water / binder ratio of 38%. Table 6 shows the properties of the super fast-hard shrinkage grout material.

Ultra-speed hard non-shrink grout Addition of Cellulose Ether J ₁₄ funnel flow rate (sec) Available time (minutes) Yield Value (Pa) Plastic viscosity (Pas) AB None 3.54.8 4855 10.725.5 0.851.01

As a model test, in Example 3, in the wooden frame which is 3000 mm in length x 600 mm in width, 550 mm in height on one side, and 385 mm in the other side is die-shaped (an inclination of the upper surface is 55/1000). The coarse aggregate having a maximum particle diameter of 40 mm was laid, and the superhard hard non-contracted grout material A was injected from the higher gradient, and the super slow hard non-constricted grout material B was injected up to 50 mm or less from the surface layer of the lower gradient. It injected | poured, the filling condition, the observation of the deflection condition, and the mold after hardening were demolded, and the inside observation was performed. As a result, it was found that even in a sloped slope, sag does not occur and the filling property into the surface layer portion and the inside is satisfactory.

The ultra-fast-hard non-shrink grouting material of the present invention is economically reasonable because it has high fluidity of fresh mortar, no material separation or bleeding, good filling property, high compressive strength and short shrinkage after curing. We can provide construction. Moreover, addition of cellulose ether achieves the effect which can improve the workability, such as not generating sag, even in the slope with a gradient.

Claims (6)

An ultra-speed hard non-shrink grout material comprising a fastening material and an expanding material having a specific surface area of 4000 cm 2 / g or more. The ultra-fast hard non-shrink grouting material according to claim 1, wherein the fastening material comprises calcium aluminate and the expanding material contains calcium sulfur aluminate. The super-speed hard non-contracting grout material according to claim 1 or 2, further comprising water-soluble cellulose ether. The ultrafast hardening shrinkage grout material according to any one of claims 1 to 3, wherein the J ₁₄ funnel falling value of the fresh mortar is 2 to 5 seconds. The yield mortar of the fresh mortar is 10-40 Pa, and the plastic viscosity is 0.5-3.0 Pa * s, The super-speed hard non-shrink grout material as described in any one of Claims 1-3 characterized by the above-mentioned. The super fast-hard non-shrink grouting material according to any one of claims 1 to 3, wherein the compressive strength of the cured product after 2 hours is at least 10 N / mm 2.