JP4489707B2 - Grout composition, mortar or concrete using the composition, and grout material - Google Patents

Description

  The present invention mainly relates to a grout composition used in the civil engineering and construction industry, mortar or concrete using the composition, and a grout material.

Recently, the performance required for grout materials has been increasing more and more, and in particular, further progress of rapid-hardening grout materials is desired.
The required physical properties of a rapid-hardening grout material include excellent fluidity and excellent retention, excellent short-term strength, and excellent dimensional stability. Satisfaction is required.
However, if it tries to satisfy the fluidity retention performance, it will be difficult to obtain short-term strength, and conversely, if the short-term strength development will be good, the fluidity retention time may not be secured. However, the development of rapid-hardening grout materials is still insufficient due to poor dimensional stability, and further improvements are desired.

For example, in the repair of expressways, it is necessary to release roads early, so that practical strength is expressed early, for example, rapid hardening that expresses a compressive strength of 24 N / mm ² or more at a material age of 3 hours. The development of grout materials was awaited.

And the required performance in this application is that it is possible to secure the flowability that can be poured for at least 10 minutes, that the mortar that is still unsettled, that so-called non-shrinkage can be ensured, 24 N / mm ² at 3 hours of age There are no hard-curing grout materials that satisfy this required performance yet, such as expressing the above compressive strength, being able to give moderate expansibility, and being dimensionally stable over the long term. Met.

As a hydraulic material, a material containing 3CaO · SiO ₂ solid solution, 11CaO · 7Al ₂ O ₃ · CaF ₂ , and anhydrous gypsum has been proposed (see Patent Document 1, Patent Document 2, and Patent Document 3). .
However, even when a grout material is prepared using this hydraulic material, it is not possible to obtain fluidity that can be poured, and it is also impossible to develop a compressive strength of 24 N / mm ² or more at a material age of 3 hours. It was a thing. Furthermore, it was not able to compensate for the settlement and shrinkage of the grout material that has not yet hardened.

On the other hand, a cement admixture mainly composed of calcium aluminosilicate glass and anhydrous gypsum and a cement composition containing the same are also known (see Patent Document 4).
Also known is a super-hard cement composition in which a monovalent and / or trivalent metal sulfate is blended with a rapid cement containing 5 to 50% of a rapid hardening component composed of calcium aluminate and gypsum. (See Patent Document 5).
However, even if grout materials are prepared using these cement compositions, the flowability that can be poured can be secured for 10 minutes or more, but the compressive strength of 24 N / mm ² or more cannot be expressed at the age of 3 hours. It was a thing.

The present inventors have used a specific quick setting cement, a specific quick hardening material and a specific setting accelerator in combination, thereby ensuring fluidity for a certain period of time, and a grout material capable of expressing high strength at an early stage. Was found to be possible, and was filed earlier (Patent Document 6).
However, this grout material is extremely temperature-dependent and exhibits good strength development under conditions of 20 ° C. or higher. However, when the conditions are 15 ° C. or lower, practical strength cannot be expressed at an early stage.

  The present inventor has found that the grout material satisfying the required performance can be prepared only by using a specific grout composition through a number of experiments, and has completed the present invention.

Japanese Patent Publication No.49-030683 Japanese Patent Publication No.49-030684 Japanese Patent Publication No.51-04135 Japanese Patent Laid-Open No. 04-097932 JP 03-012350 A Japanese Patent Laid-Open No. 17-170710

  The present invention provides a grout material that is excellent in fluidity, can compensate for settlement and shrinkage of a grout material that has not yet hardened, has excellent initial strength development even in a low temperature environment up to about 10 ° C., and has excellent dimensional stability. provide.

The present invention includes a 3CaO · SiO ₂ solid solution, 11CaO · 7Al ₂ O ₃ · CaF ₂ , and a hydraulic material containing anhydrous gypsum as active ingredients, a rapid hardening material containing calcium aluminosilicate glass and anhydrous gypsum as active ingredients, and blast furnace water granulated slag, silica fume, calcium hydroxide, superplasticizer, and, Ri Na contain condensation modifier, hydraulic material, rapid hardwood, water-granulated blast furnace slag, silica fume, and calcium hydroxide In 100 parts of the binder, the hydraulic material is 48 to 68 parts, the hardened material is 10 to 20 parts, the ground granulated blast furnace slag is 5 to 25 parts, the silica fume is 1 to 10 parts, and the calcium hydroxide is 3 parts. It is a grout composition in which a high-performance water reducing agent is 0.3 to 2 parts in terms of solid content and a setting controller is 0.05 to 1 part with respect to 100 parts of a binder , and the high-performance water reducing agent is Polycarboxylic acid-based high-performance water reducing agent The grout composition comprising a high-performance water reducing agent, wherein the coagulation modifier is the grout composition comprising an organic acid or a salt thereof, and comprising calcium nitrite and / or calcium nitrate. A grout composition, the grout composition containing a gas foaming substance, and the grout composition in which the setting modifier is anhydrous citric acid. A high-performance water reducing agent is added to 100 parts of the binder. The grout composition is 0.5 to 1.5 parts in terms of solid content, and is a mortar formed by blending the grout composition, fine aggregate, and water, and the water / binder ratio is 35 to 50%. The mortar, wherein the fine aggregate is a lime-based natural fine aggregate and / or a quartzite-based natural fine aggregate, and the fine aggregate has a roundness of 0.8 or more. This mortar is an aggregate, and it is 24 N / mm ² at a temperature of 10 ° C and a material age of 3 hours. The grout composition exhibiting the above compressive strength, which is a concrete obtained by blending the mortar and coarse aggregate, and the amount of the coarse aggregate used is 250 to 750 kg per 1 m ^{3 of} concrete. Yes , it is the concrete that expresses a compressive strength of 24 N / mm ² or more at an age of 3 hours in a 10 ° C. environment , and is a grouting material made of the mortar or the concrete.

  The present invention is excellent in fluidity, can compensate for settlement and shrinkage of a grout material that has not yet hardened, has excellent initial strength development even in a low temperature environment up to about 10 ° C., and has excellent dimensional stability. provide.

Hereinafter, the present invention will be described in detail.
In the present invention, “parts” and “%” are based on mass unless otherwise specified.

The hydraulic material used in the present invention is a clinker raw material, for example, calcined at 1,200 to 1,600 ° C. to synthesize a clinker mainly composed of 3CaO · SiO ₂ solid solution and 11CaO · 7Al ₂ O ₃ · CaF ₂ , It is prepared by adding anhydrous gypsum after grinding.
Clinker materials include CaO-based materials such as quick lime, slaked lime, and limestone; Al ₂ O ₃ materials such as alumina, bauxite, aluminum ash, diaspore, feldspar, and clay; and SiO such as silica, quartz sand, white clay, and diatomaceous earth ₂ quality raw materials and F quality raw materials such as fluorite, cryolite, calcium fluoride, sodium fluoride, and aluminum fluoride can be used. In addition, sewage sludge incineration ash, general waste, and industrial waste Things can also be used.
Generation of 3CaO · SiO ₂ solid solution and _{11CaO · 7Al 2 O 3 · CaF} 2 may be determined using Powder X-ray diffractometer.
Each mineral can be quantified by the X-ray diffraction Rietveld method. For example, “SIROQUANT” manufactured by Sietronics can be used as the quantification software.

The 3CaO · SiO ₂ solid solution (hereinafter referred to as C ₃ S solid solution) used in the present invention is expressed as C ₃ S solid solution when CaO is C and SiO ₂ is S, and CaO and SiO ₂ are mainly used. In general, Al ₂ O ₃ and MgO are included as other components.

_{Further, 11CaO · 7Al 2 O 3 ·} CaF 2 ( hereinafter, referred to as C ₁₁ A ₇ CaF ₂₎ is a type of calcium aluminate, a generic term of compounds with fluorine dissolved in the 12CaO · 7Al ₂ O ₃ is there. However, the molar ratio of fluorine F in C ₁₁ A ₇ CaF ₂ is not necessarily 1, and is usually a value between 0.5 and 1.

A hydraulic material containing C ₃ S solid solution, C ₁₁ A ₇ CaF ₂ , and anhydrous gypsum baked clinker mainly composed of C ₃ S solid solution and C ₁₁ A ₇ CaF ₂ , and then dried anhydrous gypsum. In addition, it is prepared.
Here, clinker consisting mainly of C ₃ S solid solution and C ₁₁ A ₇ CaF ₂ is, C ₃ in addition to the S solid solution and C ₁₁ A ₇ CaF _2, containing 2CaO · SiO ₂ solid solution and calcium alumino ferrite traces ing.
In the present invention, when the C ₃ S solid solution and C ₁₁ A ₇ CaF ₂ are separately synthesized and mixed, the effects of the present invention such as excellent short-term strength development cannot be obtained.
The content of C ₃ S solid solution and C ₁₁ A ₇ CaF _{2 in} the hydraulic material is not particularly limited, but C ₃ S solid solution 60-80 parts, C ₁₁ A ₇ CaF ₂ 40-20 parts Usually used. If the C ₃ S solid solution exceeds 80 parts and the C ₁₁ A ₇ CaF ₂ is less than 20 parts, the strength may not be sufficient for a short time, the C ₃ S solid solution is less than 60 parts, and the C ₁₁ A ₇ CaF ₂ is 40 parts. If it exceeds 1, fluidity retention may be impaired.
As the hydraulic material, commercially available “jet cement” can be used.

The anhydrous gypsum in the hydraulic material is not particularly limited, but type II anhydrous gypsum is usually used from the standpoint of strength development.
The content of anhydrous gypsum in the hydraulic material is preferably 1 to 30 parts. If it is less than 1 part, it may be difficult to ensure a predetermined fluidity, and if it exceeds 30 parts, strength development may be reduced.

The fineness of the hydraulic material is usually preferably 4,000 to 6,000 cm ² / g, more preferably 4,500 to 5,500 cm ² / g in terms of the specific surface area of the brane (hereinafter referred to as “brane value”). If the brain value is less than 4,000 cm ² / g, strength development may not be sufficient, and if it exceeds 6,000 cm ² / g, the change in fluidity with time may increase.

  The rapid-hardening material mainly composed of calcium aluminosilicate glass and anhydrous gypsum used in the present invention improves strength development in a short time when combined with a hydraulic material.

Here, the calcium aluminosilicate glass (hereinafter referred to as CAS) is a generic term for amorphous substances mainly composed of CaO, Al ₂ O ₃ , and SiO ₂ , and is not particularly limited. Usually, the total of CaO, Al ₂ O ₃ and SiO ₂ is 80% or more, CaO is 40 to 48 parts, Al ₂ O ₃ is 35 to 42 parts, and SiO ₂ is 10 to 15 parts. Those are preferred. Outside this range, it may be difficult to develop a predetermined strength.
Examples of the CAS production material include a Ca0 quality material, an Al ₂ O ₃ quality material, and a SiO ₂ quality material.
As the CaO material, quick lime, slaked lime, limestone, etc., as the Al ₂ O ₃ material, alumina, bauxite, diaspore, feldspar, clay, etc., and as the SiO ₂ material, silica sand , White clay, diatomaceous earth, etc. can be used. Also, the relatively inexpensive blast furnace slag, it is also possible to compensate for the Ca0 feedstocks and Al ₂ O ₃ feedstocks.
CAS blends the above-mentioned Ca0 quality raw material, Al ₂ O ₃ quality raw material, and SiO ₂ quality raw material at a predetermined ratio, melts them using a direct current melting furnace, a high frequency furnace, etc., and compresses the resulting melt. It is manufactured by a method of blowing off with air or high-pressure water, a method of pouring into water, or the like. It can also be produced by melting in a rotary kiln and quenching.
The vitrification ratio of CAS is preferably 90% or more, more preferably 95% or more. If it is less than 90%, the strength may be lowered for a short time.
The vitrification rate can be measured, for example, by the X-ray diffraction Rietveld method. Usually, a sample ground to a brain value of about 5,000 cm ² / g is used as an internal standard substance in 100 parts of a sample of 20 parts. About 30 parts are blended and thoroughly mixed in an agate mortar, followed by powder X-ray diffraction measurement. The measurement results were analyzed with Sietronics' quantitative software “SIROQUANT” to determine the vitrification rate.
Further, the CAS particle size is preferably 4,000 to 8,000 cm ² / g, more preferably 5,000 to 7,000 cm ² / g in terms of the brain value. If it is less than 4,000 cm ² / g, the short-term strength may not be sufficiently developed, and if it exceeds 8,000 cm ² / g, the fluidity retention time may not be sufficient.

The anhydrous gypsum in the rapid-hardening material is not particularly limited, but the use of type II anhydrous gypsum is preferable from the viewpoint of strength development.
The amount of anhydrous gypsum used in the quick-hardened material is preferably 75 to 125 parts, more preferably 90 to 110 parts, relative to 100 parts of CAS. If it is less than 75 parts, strength development may not be sufficient, and if it exceeds 125 parts, the dimensional change becomes large and long-term durability may be deteriorated.

The particle size of the rapid-hardening material is not particularly limited, but it is preferably 4,000 to 8,000 cm ² / g, more preferably 5,000 to 7,000 cm ² / g in terms of brain value. If it is less than 4,000 cm ² / g, the expression of short-term strength may not be sufficient, and if it exceeds 8,000 cm ² / g, it will be uneconomical due to excessive grinding power.

In the present invention, ground granulated blast furnace slag (hereinafter referred to as slag powder) is used in combination. By using slag powder in combination, not only the dimensional stability is improved, but also the bending strength can be dramatically increased.
Although it does not specifically limit as slag powder, Usually, "the blast furnace slag fine powder for concrete" prescribed | regulated to JIS A 6206-1997 can be used.
The fineness of the slag powder is not particularly limited, and is 3,000 to 10,000 cm ² / g as a brain value.

In the present invention, silica fume is used in combination. By using silica fume in combination, the material separation resistance is increased and the strength development is also improved.
In the present invention, it is preferable to select acidic silica fume for reasons such as improving fluidity while imparting material separation resistance and improving strength development. Here, the acidic silica fume means an acid having a pH of 5.0 or less when the supernatant liquid is stirred with 1 g of silica fume in 100 cc. Silica fume usually has a BET specific surface area value (hereinafter referred to as BET) of about ^{2 to 20} m ² / g.

The calcium hydroxide used in the present invention is not particularly limited and is a general term for compounds represented by Ca (OH) ₂ . The impurities are not particularly limited as long as they do not contain harmful substances for the environment.
The non neat, may contain calcium oxide or calcium carbonate.
Although the specific surface area of calcium hydroxide is not particularly limited, preferably 20 m ² / g or less in BET, more preferably at most 15 m ² / g. If it exceeds 20 m ² / g, the fluidity tends to deteriorate and it is difficult to ensure the pot life.

In the present invention, C ₃ S solid solution, C ₁₁ A ₇ CaF ₂ , hydraulic material containing anhydrous gypsum, rapid hardening material containing CAS and anhydrous gypsum, slag powder, silica fume, and calcium hydroxide The ratio of each component in 100 parts of the binder composed of is not particularly limited, but the hydraulic material is preferably 48 to 68 parts, more preferably 53 to 65 parts. The rapid hardening material is preferably 10 to 20 parts, more preferably 13 to 17 parts. The slag powder is preferably 5 to 25 parts, more preferably 10 to 20 parts. Silica fume is preferably 1 to 10 parts, more preferably 3 to 7 parts. The calcium hydroxide is preferably 1 to 10 parts, more preferably 3 to 7 parts. If the blending ratio of each component in 100 parts of the binder is not within the above range, the required performance of the present invention, that is, fluidity, material separation resistance, strength development and dimensional stability cannot be maintained at a high level. There is a case.

The high-performance water reducing agent used in the present invention can be either liquid or powder and is not particularly limited, but preferably contains a polycarboxylic acid-based high water reducing agent. Specific examples of the polycarboxylic acid-based high-performance water reducing agent include a trade name “Mighty 21PZ” manufactured by Kao Corporation, and a trade name “Melflux Series” manufactured by Degussa Construction Systems.
In the present invention, it is more preferable to use a melamine-based high-performance water reducing agent in combination with a polycarboxylic acid-based high-performance water reducing agent. By using a polycarboxylic acid-based high-performance water reducing agent and a melamine-based high-performance water-reducing agent in combination, material separation resistance can be improved, and generation of bubbles resulting from the use of a polycarboxylic acid-based high-performance water reducing agent is suppressed. It is possible.
Specific examples of the melamine-based high-performance water reducing agent include, for example, “SEICAMENT FF Powder” manufactured by Nippon Sika Co., Ltd.
Although the usage-amount of a high performance water reducing agent is not specifically limited, Usually, 0.3-2 parts is preferable in conversion of solid content with respect to 100 parts of binders. If it is less than 0.3 part, fluidity | liquidity is not enough and it may not be filled, and if it exceeds 2 parts, material separation may be caused.

As the setting regulator used in the present invention, an organic acid or a salt thereof is preferable. For example, oxycarboxylic acids such as citric acid, tartaric acid, malic acid, gluconic acid, and succinic acid, or sodium, potassium thereof, One or more of calcium, magnesium, ammonium, and aluminum salts can be used.
Although the usage-amount of a setting regulator is not specifically limited, Usually, 0.05-1 part is preferable with respect to 100 parts of binders, and 0.1-0.3 part is more preferable. If it is less than 0.05 part, the fluidity retention time may not be sufficient, and if it exceeds 1 part, strength development may not be sufficient.

In the present invention, calcium nitrite and / or calcium nitrate (hereinafter referred to as nitrates) is used to maintain fluidity for a certain period of time.
Although the usage-amount of nitrates is not specifically limited, Usually, 0.3-3 parts are preferable with respect to 100 parts of binders, and 0.5-2 parts are more preferable. If it is less than 0.3 part, the effect of maintaining fluidity may not be sufficient, and if it exceeds 3 parts, material separation may occur.

In the present invention, it is preferable to use a gas foaming substance in combination in order to integrate the existing structure and the grout material and to prevent the grout material that has not yet solidified from sinking or shrinking.
Specific examples of the gas foaming material include aluminum powder and carbon material, and peroxidation materials such as persulfate, perborate, percarbonate, and permanganate. In the present invention, it is preferable to use a carbon substance or a peroxide substance because of its great effect of suppressing settlement, and among these, it is more preferable to use a percarbonate or a perborate.
The amount of the gas foaming substance used is not particularly limited, but usually, aluminum powder is preferably 0.0001 to 0.1 part, more preferably 0.001 to 0.01 part, with respect to 100 parts of the binder. If it is less than 0.0001 part, sufficient initial expansion effect may not be imparted, and if it exceeds 0.1 part, it may be excessively expanded and strength development may be deteriorated.
Further, if the gas foaming substance is a carbonaceous substance, 1 to 15 parts is preferable with respect to 100 parts of the binder, and 3 to 10 parts is more preferable. If it is less than 1 part, a sufficient initial expansion effect may not be imparted, and if it exceeds 15 parts, it may be over-expanded and strength development may be deteriorated.
Furthermore, if the gas foaming substance is a peroxide substance, 0.005 to 0.5 part is preferable with respect to 100 parts of the binder, and 0.01 to 0.1 part is more preferable. If it is less than 0.005 part, sufficient initial expansion effect may not be imparted, and if it exceeds 0.5 part, it may be overexpanded and strength development may be deteriorated.

  In the grout material of the present invention, the amount of water used is very important. Specifically, the water / binder ratio is preferably 35 to 50%, more preferably around 38 to 46%. If it is less than 35%, the long-term dimensional change may be worsened or expansion failure may occur. If it exceeds 50%, the required performance may not be satisfied in terms of strength development or material separation may occur.

  The fine aggregate used in the present invention is not particularly limited. Specific examples thereof include natural fine aggregates such as lime and quartzite, and artificial aggregates such as slag and recycled aggregates. Among these are rounded and rounded spheroidized aggregates.

In the present invention, spheroidization means that the corner of the particle surface is removed and the degree of sphericity of the particle shape is increased. The degree of spheroidization can be expressed by roundness. The roundness is expressed by (projected area of particles) / (area of a circle having the same peripheral length as the projected peripheral length of the particles). The method for measuring roundness is not particularly limited. For example, as described in JP-A-11-060298, from a micrograph, the projected area (A) of a particle and the projected peripheral length (PM) ) Can be obtained by measuring. When the area of a perfect circle having the same circumference as the projected circumference of the particle is (B), the roundness is roundness = A / B = 4πA / (PM) ² (however, the roundness is 0 to 1) In range).
The method for measuring roundness is not particularly limited, but images taken with a scanning electron microscope, a stereomicroscope, or the like can be used with an image analysis device such as an image analysis device manufactured by Nihon Avionics or image analysis software. It is preferable to analyze. The roundness of the spheroidized fine aggregate is usually 0.8 or more.

In the present invention, a part of the fine aggregate can be replaced with a heavy aggregate having a density of 3.0 g / cm ³ or more.
The heavy aggregate may have a density of 3.0 g / cm ³ or more, and is not particularly limited. Specific examples thereof include, for example, an artificial aggregate, a blast furnace annealed slag fine aggregate, an electric furnace Oxidized slag fine aggregates, ferronickel slag fine aggregates, ferrochrome slag fine aggregates, copper slag fine aggregates, etc., and natural aggregates are fine peridotite. Aggregates, so-called olivine sand, emery ore, and the like can be mentioned. In the present invention, one or more of these can be used in combination.
Although the use of the fine aggregate is not particularly limited, it is usually preferably 100 to 200 parts, more preferably 125 to 175 parts with respect to 100 parts of the grout composition. If it is less than 100 parts, the calorific value and dimensional change may be large, and if it exceeds 200 parts, fluidity and strength development may be deteriorated.

The coarse aggregate used in the present invention is not particularly limited, but a spheroidized one is preferable. If it is not a spheroidized coarse aggregate, fluidity may be impaired.
Here, the spheroidized coarse aggregate is one in which the corners of the particle surface are taken and the degree of the spherical shape of the particle shape is increased.
The degree of spheroidization can be expressed by roundness like the spheroidized fine aggregate, and it is preferable to use coarse aggregate having a roundness of 0.8 or more.
The maximum diameter of the coarse aggregate is not particularly limited, but is usually preferably 20 mm or less, and more preferably 15 mm or less. When the maximum particle size of the coarse aggregate exceeds 20 mm, material separation may occur or strength development may be deteriorated.
The amount of coarse aggregate used is not particularly limited, but it is usually preferably 1,000 kg or less per 1 m ^{3 of} concrete composed of the mortar of the present invention and coarse aggregate. If it exceeds 1,000 kg / m ³ , fluidity may be impaired.

  Each material of the grout material of the present invention may be mixed at the time of construction, or a part or all of them may be mixed in advance.

  In the present invention, in addition to the hydraulic material, rapid hardening material, slag powder, silica fume, calcium hydroxide, high-performance water reducing agent, setting modifier, nitrates, gas foaming substance, and aggregate of the present invention, fly ash, Inorganic fine powders such as limestone fine powder and blast furnace slow-cooled slag fine powder, clay minerals such as bentonite and zeolite, polymers, fibrous materials, and antifoaming agents can be used in combination.

  Hereinafter, the present invention will be further described based on experimental examples of the present invention.

Experimental example 1
A binder is prepared by blending hydraulic material, rapid hardener, slag powder, silica fume, and calcium hydroxide shown in Table 1, and 100 parts of this binder is condensed with 0.5 part of high-performance water reducing agent A. A grout composition was prepared by adding 0.1 part of a regulator.
Mix 150 parts of fine aggregate α with 100 parts of the prepared grout composition, add water and knead to a water / binder ratio of 43%, prepare mortar, observe bleeding and material separation The fluidity, compressive strength, and length change rate were evaluated in a 10 ° C environment. The results are also shown in Table 1.

<Materials used>
Hydraulic material: Sumitomo Osaka Cement, trade name “Jet Cement”, density 3.06g / cm ³ , brain value 5,500cm ² / g
Rapid hardwood: Equivalent mixture of CAS and anhydrous gypsum, density 2.90 g / cm ³ , brain value 6,000 cm ² / g
Slag powder: Granulated blast furnace slag, commercially available, density 2.90 g / cm ³ , brain value 4,000 cm ² / g
Calcium hydroxide: Commercially available slaked lime, density 2.25 g / cm ³ , BET ⁵ m ² / g
Silica fume: Acidic silica fume, BET15m ² / g
Superplasticizer A: Mixture of 70 parts of a commercially available polycarboxylic acid type superplasticizer and 30 parts of a commercially available melamine type superplasticizer: Condensation modifier: anhydrous citric acid, reagent grade 1 fine aggregate α: lime sand 0.6mm vulgar and 1.2mm to 0.6mm equivalent mixture, density 2.71g / cm ³
Water: Tap water

<Measurement method>
Liquidity: Japan Society of Civil Engineers standard How to Display the document (JSCE-F541) of the J ₁₄ funnel measuring the efflux time in accordance with the measurement of consistency due to bleeding: in accordance with JIS A 1123, measured from the dough rise until after 5 minutes, bleeding Calculate rate Material separation: Confirmation of fine aggregate sedimentation by tactile sensation Compressive strength: 40 × 40 × 160mm specimen was prepared and measured for compressive strength at age of 3 hours according to JIS R 5201 Rate of change: Measured according to JIS A 6202 (B)

Experimental example 2
A high-performance water reducing agent and nitrates shown in Table 2 for 100 parts of a binder consisting of 58 parts of hydraulic material, 17 parts of rapid hardening material, 15 parts of slag powder, 5 parts of silica fume and 5 parts of calcium hydroxide, A grout composition was prepared by blending 0.1 part of a setting modifier.
Blended α100 parts fine aggregate to 100 parts of the prepared grout composition, kneaded at a water / binder ratio of 43% to prepare mortar, observed bleeding, material separation, and generation of bubbles, Properties, pot life, compressive strength, and rate of change in length were evaluated in a 10 ° C environment. The results are also shown in Table 2.

<Materials used>
High-performance water reducing agent B: Polycarboxylic acid-based high-performance water reducing agent Nitrate a: Calcium nitrate, reagent grade 1

<Measurement method>
Pot life: measuring the flow-down value in accordance with the measurement of consistency by J ₁₄ funnel. The holding time during which the flow down value could be secured within 20 seconds was defined as the pot life.
Generation of bubbles: Visual confirmation

Experimental example 3
High-performance water reducing agent A 0.5 part, setting modifier 0.1 part for 100 parts of binder consisting of 58 parts hydraulic material, 17 parts rapid hardening material, 15 parts slag powder, 5 parts silica fume, and 5 parts calcium hydroxide Parts and nitrates shown in Table 3 were blended to prepare a grout composition.
Mix 100 parts of the prepared grout composition with 150 parts of fine aggregate α, mix at a water / binder ratio of 43% to prepare mortar, observe bleeding and material separation, fluidity, pot life The compressive strength and the rate of change in length were evaluated in a 10 ° C environment. The results are also shown in Table 3.

<Materials used>
Nitrate B: Calcium Nitrite, Reagent Grade 1 Nitrate C: Nitrate Equivalent Mix of B

Experimental Example 4
High-performance water-reducing agent A 0.5 part, setting modifier 0.1 part for 100 parts of binder consisting of 58 parts of hydraulic material, 17 parts of rapid hardening material, 15 parts of slag powder, 5 parts of silica fume and 5 parts of calcium hydroxide A grout composition was prepared by mixing 2 parts of nitrate, 2 parts of nitrates, and a gas foaming substance shown in Table 4.
Mix 100 parts of the prepared grout composition with 150 parts of fine aggregate, mix at a water / binder ratio of 43% to prepare mortar, observe bleeding and material separation, initial expansion rate, fluidity The pot life , compressive strength, and rate of change in length were evaluated in a 10 ° C environment. The results are also shown in Table 4.

<Materials used>
Gas foaming material a: sodium percarbonate, reagent primary gas foaming material b: sodium perborate, reagent primary gas foaming material c: aluminum powder, industrial gas foaming material d: carbonaceous material, commercially available coke

<Measurement method>
Initial expansion rate: Japan Society of Civil Engineers "Expanded concrete design and construction guidelines (draft)" Appendix 2. Measured according to the appendix “Construction Procedures for Filling Mortar Using Expandable Material (Draft)”. However,-in a table | surface shows a contraction side and + shows an expansion | swelling side.

Experimental Example 5
High-performance water-reducing agent A 0.5 part, setting modifier 0.1 part for 100 parts of binder consisting of 58 parts of hydraulic material, 17 parts of rapid hardening material, 15 parts of slag powder, 5 parts of silica fume and 5 parts of calcium hydroxide A grout composition was prepared by blending 2 parts with 2 parts nitrate and 2 parts nitrate.
Fine aggregates shown in Table 5 are added to 100 parts of the prepared grout composition, mixed with the water / binder ratio (water ratio) shown in Table 5 to prepare mortar, and observation of bleeding and material separation is observed. The fluidity, pot life, compressive strength, and rate of change in length were evaluated in a 10 ° C environment. The results are also shown in Table 5.

<Materials used>
Fine aggregate β: Equal mixture of non-spherical No. 6 silica sand and No. 7 silica sand, roundness 0.65
Fine aggregate γ: Sphericalized mixture of No. 6 silica sand and No. 7 silica sand, roundness 0.8

Experimental Example 6
58 parts of hydraulic material, 17 parts of rapid hardening material, 15 parts of slag powder, 5 parts of silica fume, 100 parts of binder consisting of 5 parts of calcium hydroxide, 0.5 part of high-performance water reducing agent A, setting adjustment A grout composition was prepared by blending 0.1 part of an agent, 2 parts of nitrates a, and 0.1 part of a gas foaming substance a.
A mortar was prepared by blending 150 parts of the fine aggregate α with 100 parts of the prepared grout composition and kneading at a water / binder ratio of 43%.
A concrete is prepared by blending the prepared mortar with the unit amount of coarse aggregate shown in Table 6. The slump flow, pot life, initial expansion rate, temperature rise, compressive strength, and length change rate are 10 ° C. Evaluated in the environment. The results are also shown in Table 6.

<Materials used>
Coarse aggregate δ: Commercially available gravel, silica-based, Gmax 15 mm, roundness 0.8, density 2.65 g / cm ³
Coarse aggregate ε: Commercially available crushed stone, silica-based, Gmax 15 mm, roundness 0.65, density 2.65 g / cm ³

<Measurement method>
Slump flow: Fluidity of concrete, usable time measured according to JIS A 1150: Measures concrete temperature with thermocouple, shows time expansion side 2 ° C rise from kneading temperature.
Temperature rise: Concrete calorific value, φ10cm x 20cm height cylinder filled with concrete, and the center temperature of the specimen measured with a thermocouple Compressive strength: Measurement length change according to JIS A 1108 Rate: Measured at a material age of 7 days according to JIS A 6202 (B)

  By using the grout composition of the present invention, mortar or concrete having excellent fluidity, excellent initial strength development even in a low temperature environment up to about 10 ° C., and excellent in dimensional stability can be obtained. The mortar and concrete can be widely used for civil engineering and construction as a material for emergency repair.

Claims (18)

3CaO · SiO ₂ solid solution, 11CaO · 7Al ₂ O ₃ · CaF ₂ , hydraulic material containing anhydrous gypsum as active ingredients, rapid hardening material containing calcium aluminosilicate glass and anhydrous gypsum as active ingredients, ground granulated blast furnace slag , silica fume, calcium hydroxide, superplasticizer, and, Ri Na contain condensation modifier, binder 100 made of hydraulic material, rapid hardwood, water-granulated blast furnace slag, silica fume, and calcium hydroxide In the part, hydraulic material is 48-68 parts, rapid hardening material is 10-20 parts, blast furnace granulated slag fine powder is 5-25 parts, silica fume is 1-10 parts, and calcium hydroxide is 3-10 parts. Yes, a grout composition in which the high-performance water reducing agent is 0.3 to 2 parts in terms of solid content and the setting regulator is 0.05 to 1 part with respect to 100 parts of the binder . The grout composition according to claim 1 , wherein the high-performance water reducing agent contains a polycarboxylic acid-based high-performance water reducing agent. The grout composition according to claim 1 or 2 , wherein the high-performance water reducing agent contains a polycarboxylic acid-based high-performance water reducing agent and a melamine-based high-performance water reducing agent. The grout composition according to any one of claims 1 to 3 , wherein the setting modifier is an organic acid or a salt thereof. The grout composition according to any one of claims 1 to 4 , comprising calcium nitrite and / or calcium nitrate. The grout composition according to any one of claims 1 to 5 , comprising a gas foaming substance. The grout composition according to any one of claims 1 to 6, wherein the setting controller is anhydrous citric acid. The grout composition according to any one of claims 1 to 7, wherein the high-performance water reducing agent is 0.5 to 1.5 parts in terms of solid content with respect to 100 parts of the binder. The mortar formed by mix | blending the grout composition as described in any one of Claims 1-8 , a fine aggregate, and water. A mortar according to claim 9 , wherein the water / binder ratio is 35-50%. The mortar according to claim 9 or 10, wherein the fine aggregate is a lime-based natural fine aggregate and / or a quartzite-based natural fine aggregate. The mortar according to any one of claims 9 to 11, wherein the fine aggregate is a spheroidized fine aggregate having a roundness of 0.8 or more. 24N / mm in 3 hours of age under 10 ℃ environment ² The grout composition according to any one of claims 9 to 12, which exhibits the above compressive strength. A grout material comprising the mortar according to any one of claims 9 to 13 . Concrete obtained by blending the mortar according to any one of claims 9 to 13 and coarse aggregate. The amount of coarse aggregate used is 1m of concrete ^Three The concrete according to claim 15, wherein the weight is 250 to 750 kg. 24N / mm in 3 hours of age under 10 ℃ environment ² The concrete of Claim 15 or Claim 16 which expresses the above compressive strength. A grout material comprising the concrete according to claim 16 or 17 . .