CN117177952A - Grouting material, grouting mortar composition and cured body - Google Patents

Grouting material, grouting mortar composition and cured body Download PDF

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Publication number
CN117177952A
CN117177952A CN202280030079.5A CN202280030079A CN117177952A CN 117177952 A CN117177952 A CN 117177952A CN 202280030079 A CN202280030079 A CN 202280030079A CN 117177952 A CN117177952 A CN 117177952A
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China
Prior art keywords
mass
parts
grouting
cement
less
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CN202280030079.5A
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Chinese (zh)
Inventor
佐佐木崇
高木聪史
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Denka Co Ltd
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Denka Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/02—Elements
    • C04B22/04—Metals, e.g. aluminium used as blowing agent
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/16—Sulfur-containing compounds
    • C04B24/20—Sulfonated aromatic compounds
    • C04B24/22—Condensation or polymerisation products thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Civil Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The grouting material comprises cement, an expansion material, a gas foaming substance, a water reducing agent and fine aggregate, wherein the expansion material contains tobermorite. Can provide a grouting material, a grouting mortar composition and a cured body which have high fluidity and can further improve the self-healing effect.

Description

Grouting material, grouting mortar composition and cured body
Technical Field
The present application relates to a grouting material, a grouting mortar composition, and a cured product obtained by using the grouting mortar composition, which are used in the civil engineering ■ building industry.
Background
The grouting material is used for improving the operability and filling property of mortar and concrete, so that grouting work is smoothly performed.
As main applications, for example, construction of an underground structure, fixation of a bridge support, fixation of various mechanical systems, and filling of a gap between walls and columns in vibration-resistant reinforcement, and the like, integration of the structures is required (1) in accordance with fluidity required for filling positions, filling methods, and the like, (2) in accordance with non-shrinkage of gaps, and no bleeding or sagging after filling, and (3) in accordance with various strengths required for use conditions of the structure (for example, see non-patent document 1).
Since the volume of the cement cured body decreases with water and/or drying of the cement, there is a risk of cracking or lowering the adhesion property to the conventional structure. The occurrence of cracking may not only affect the appearance, but also adversely affect the stability, water repellency and water tightness of the structure.
Accordingly, as an expansion material used for the purpose of compensating shrinkage of cement, suppressing occurrence of cracking, and maintaining adhesion property to a structure, for example, other than 3CaO ■ Al 2 O 3 ■CaSO 4 (blue Fabry-Perot), in CaSO 4 And calcium sulfoaluminate (Lan Fangdan-series expansion material) containing CaO as a main component, lime (lime-series expansion material) containing free lime as a main component, and expansion materials containing free lime, a hydraulic substance, and gypsum.
In addition to cement and an expansive material, a grouting material has been proposed in which a specific water reducing agent is combined to significantly improve the filling property retention effect of fluidity ■ with little temperature dependence and to provide a long-term strength enhancing effect (for example, see patent document 1).
In addition, a high-strength grouting material that maintains excellent fluidity, suppression of bubble generation, optimal length change rate, and volume expansion rate has been proposed (for example, see patent document 2).
However, the conventional grouting material has problems of low fluidity, cracking of the cured body, and low self-healing effect after the cracking.
Prior art literature
Patent literature
Patent document 1: japanese patent No. 3894780
Patent document 2: international publication No. 2007/029399 handbook
Non-patent literature
Non-patent document 1: mixed material for new cement ■ concrete, 304-307 pages, chi Jing Fangfu @ sakagu Yulang, technical college, ping Cheng 19 years 1 month 15 release
Disclosure of Invention
Problems to be solved by the application
The present application aims to provide a grouting material, a grouting mortar composition and a cured body which have high fluidity and can further improve the self-healing effect.
Means for solving the problems
The present application has been made to solve the above problems, and the inventors of the present application have repeatedly made various efforts to solve the above problems, and as a result, have found that a specific amount of SO is contained 3 MgO, thereby having high fluidity, further improving the self-healing effect and improving the durability, thereby completing the present application. The gist of the present application is as follows.
[1] The grouting material comprises cement, an expansion material, a gas foaming substance, a water reducing agent and fine aggregate, wherein the expansion material contains tobermorite.
[2]As described above [1]]The grouting material of, wherein SO 3 The amount of (2) is 0.5 to 10.0 mass%, and the amount of MgO is 0.1 to 3.0 mass%.
[3] The grouting material according to [1] or [2], wherein the content of the tobermorite is 0.05 parts by mass or more and 20 parts by mass or less relative to 100 parts by mass of the swelling material.
[4]As described above [1]]～[3]The grouting material according to any one of, further comprising a rapid hardening material, wherein the rapid hardening material comprises calcium aluminate, and CaO/Al of the calcium aluminate 2 O 3 The molar ratio is 1.2 to 3.0, and the content of the calcium aluminate is 2 to 20 parts by mass based on 100 parts by mass of the cement.
[5] The grouting material according to any one of [1] to [4], wherein the fine aggregate is contained in an amount of 40 parts by mass to 300 parts by mass, based on 100 parts by mass of the cement.
[6] The grouting material according to any one of [1] to [5], further comprising a nitrite, wherein the nitrite is contained in an amount of 2 parts by mass or more and 20 parts by mass or less based on 100 parts by mass of cement.
[7] A grouting mortar composition comprising the grouting material according to any one of [1] to [6] above and water.
[8] A cured product obtained by using the grouting mortar composition described in the above [7 ].
Effects of the application
According to the present application, a grouting material, a grouting mortar composition, and a cured product, which have high fluidity and can further improve the self-healing effect, can be provided.
Detailed Description
The present application will be described in detail below.
Unless otherwise specified, parts and mass% in the present specification are based on mass.
In the present specification, the grouting mortar is a generic term for paste without coarse aggregate and mortar containing fine aggregate.
The grouting material of the application comprises cement, an expanding material, a gas foaming substance, a water reducing agent, fine aggregate, preferably SO 3 The amount of (2) is 0.5 to 10.0 mass%, and the amount of MgO is 0.1 to 3.0 mass%.
The grouting material of the present application focuses on SO contained therein 3 Amount of MgO, determine SO 3 The amount of MgO affects the fluidity and self-healing effect of the grouting material. That is, if SO is contained in the grouting material 3 When the amount of (2) is less than 0.5 mass% and the amount of MgO is less than 0.1 mass%, the fluidity is lowered and the self-healing effect is lowered. In addition, if SO 3 If the amount of (2) is more than 10.0 mass% and the amount of MgO is more than 3.0 mass%, the fluidity is lowered and the self-healing effect is lowered.
From the viewpoints of improving fluidity and improving self-healing effect, SO contained in the grouting material 3 The amount of (c) is preferably 0.5% by mass or more, more preferably 0.7% by mass or more, and still more preferably 0.8% by mass or more. In addition, from the same viewpoint, SO contained in the grouting material 3 The amount of (2) is required to be 10.0 mass% or less, preferably 8.0 mass% or less, and more preferably 6.0 mass% or lessAnd (3) downwards.
The amount of MgO contained in the grouting material is preferably 0.1 mass% or more, more preferably 0.15 mass% or more, and even more preferably 0.2 mass% or more, from the viewpoint of improving fluidity and improving self-healing effect. From the same viewpoint, the amount of MgO contained in the grouting material is preferably 3.0 mass% or less, more preferably 2.0 mass% or less, and even more preferably 1.0 mass% or less.
SO contained in grouting material 3 The amount of MgO can be added to the grouting material, for example, by adding an SO-containing component 3 And adjusting the additive of MgO. In addition, SO 3 The MgO content can be measured by X-ray fluorescence diffraction (XRF).
The cement used in the present application is not particularly limited, and examples thereof include various cements such as ordinary, early strength, super early strength, low heat and medium heat, various mixed cements obtained by mixing blast furnace slag, fly ash, silica fume and the like with these cements, environment-friendly cement (environment-friendly cement) produced from municipal waste incineration ash and sewage sludge incineration ash as raw materials, commercially available particulate cement and the like, and various cements and various mixed cements may be pulverized and used. In addition, cement prepared by increasing or decreasing the amount of components (for example, gypsum) used in usual cement may be used.
In the present application, from the viewpoints of high fluidity, salt damage resistance, adhesion strength to steel bars, and rust prevention, ordinary portland cement and early strength portland cement are preferably selected.
In the cement used in the present application, the Blaine specific surface area value of the cement is preferably 2,500cm from the viewpoints of manufacturing cost and strength presentation 2 Per gram of 7,000cm or more 2 Preferably 2,750cm or less 2 Per gram of 6,000cm or more 2 Preferably 3,000cm or less per gram 2 Per gram of 4,500cm or more 2 And/g or less.
Blaine specific surface area was determined in accordance with JIS R5201 (physical test method for Cement).
The swelling material used in the present application is not particularly limited, and any swelling material may be used as long as it can produce swelling water and substances and inhibit bleeding.
As the expansion material, an expansion material containing free lime, free magnesia, calcium ferrite, ettringite (ettringite) system, lime system, ettringite-lime composite system is known, but is not particularly limited, but from the viewpoint of long-term stability, an expansion material containing free lime is preferable. Examples of the expansion material containing free lime include free lime-anhydrite, free lime-hydraulic compound, and free lime-hydraulic compound-anhydrite.
The expansion material used in the present application preferably contains tobermorite. The tobermorite is prepared from 5CaO ■ SiO 2 2 ■SO 3 The indicated minerals promote the hydraulic reaction. Further, since the tobermorite itself hardly reacts, it is supposed that the filler acts as a filler, and the fluidity retention property is good. Therefore, the fluidity retention effect can be maintained at high temperatures.
The content of the tobermorite is preferably 0.05 parts by mass or more and 20 parts by mass or less, more preferably 0.1 parts by mass or more and 18 parts by mass or less, and still more preferably 0.5 parts by mass or more and 15 parts by mass or less, relative to 100 parts by mass of the swelling material. By setting the content of the tobermorite within the above range, both the curing acceleration and the fluidity retention property can be made good.
In the present application, since the expansion property is good, it is preferable to use a free lime-hydraulic compound-anhydrite system, and in particular, the content of free lime is preferably more than 40 mass%.
Examples of the hydraulic compound include 1 or 2 or more of blue calcite, calcium ferrite, calcium aluminoferrite, calcium silicate, and calcium aluminate. In the present application, commercially available swelling materials and static crushing materials can be used as the swelling material.
The swelling material and the static crushing material are sold by various companies, and typical examples thereof include "Denka CSA#20" by Denka, denka Power CSA "by Denka, and" EXPAN "by Taiheiyo Materials, and" HYPER EXPAN "," N-EX "," BRISTER ", and crushed products thereof.
The particle size of the swelling material used in the present application is not particularly limited, and is preferably 2,000cm in terms of Blaine specific surface area value 2 25,000 cm/g or more 2 The ratio of the total weight per gram is preferably not more than 2,200cm 2 15,000 cm/g or more 2 Preferably 2,400cm or less 2 10,000 cm/g or more 2 And/g or less. By setting the Blaine specific surface area value of the swelling material to the lower limit or more, bleeding can be suppressed. Further, by setting the Blaine specific surface area value of the swelling material to the above-described upper limit value or less, sufficient swelling property can be obtained.
The content ratio of the expansive material used in the present application is preferably 0.5 parts by mass or more and 20 parts by mass or less, more preferably 1.0 parts by mass or more and 18 parts by mass or less, and still more preferably 2 parts by mass or more and 15 parts by mass or less, per 100 parts by mass of cement. When the content ratio of the swelling material is not less than the lower limit, a cracking suppression effect can be easily obtained. When the content ratio of the swelling material is equal to or less than the upper limit value, the strength is improved. When the content ratio of the swelling material is within the above range, the grouting material satisfying the effects of the present application, that is, the grouting mortar material having improved fluidity and improved self-healing effect can be easily obtained.
The grouting material of the present application may contain a rapid hardening material together with cement, an expansive material, a gas foaming material, a water reducing agent, and a fine aggregate from the viewpoint of promoting setting and achieving strength improvement in a short period of time.
The rapid hardening material used in the present application is not particularly limited as long as it can promote coagulation and can achieve strength enhancement in a short period of time. Examples of the rapid hardening material for accelerating the coagulation include calcium salts of organic acids represented by calcium formate, nitrate, sulfate, carbonate, thiocyanate, amines, maleic anhydride, silicate represented by water glass, aluminum sulfate, aluminum salts represented by alum, calcium aluminate (calcium aluminate), aluminate, and the like. Among them, from the viewpoint of strength presentation, aluminates are preferable, and Calcium Aluminate (CA) is preferably contained. Calcium aluminate is more preferably used in combination with gypsum from the viewpoint of the strength presentation becoming good. The amount of gypsum used is preferably 80 to 250 parts by mass, more preferably 90 to 220 parts by mass, and even more preferably 100 to 200 parts by mass, based on 100 parts by mass of calcium aluminate. By setting the content of gypsum to the above lower limit or more, early curability can be easily obtained. In addition, when the content of gypsum is not more than the upper limit, the strength-exhibiting property and the self-healing effect are improved. When the content of gypsum is within the above range, the cement mortar material can be easily cured at an early stage to achieve the effect of the present application, and the self-healing effect can be improved.
The calcium aluminate is formed by mixing a calcium oxide raw material and an aluminum oxide raw material, and then firing the mixture in a kiln or melting the mixture in an electric furnace and cooling the mixture 2 O 3 Any of crystalline and amorphous substances can be used as the general term for substances having water and active substances as main components. Is a material with a fast curing time and a high initial strength. As a representative material of calcium aluminate, alumina cement is mentioned, and commercial products can be generally used. For example, alumina cement No. 1, alumina cement No. 2, and the like can be used. Among them, amorphous calcium aluminate which is quenched after melting is preferable from the viewpoint of solidification in a shorter time than alumina cement and subsequent high initial strength exhibiting property.
CaO and Al in calcium aluminate 2 O 3 Molar ratio (CaO/Al) 2 O 3 The molar ratio) is preferably 1.2 to 3.0, more preferably 1.7 to 2.5. When the molar ratio is within the above range, the curing time can be further shortened and the initial strength appearance can be improved.
In the present application, the impurity content in the calcium aluminate is preferably 15 mass% or less, more preferably 10 mass% or less, from the viewpoint of initial strength presentation. Here, the impurities refer to: caO and Al 2 O 3 Other substances. If the impurity is more than 15 mass%, curing takes time and sometimes does not solidify at low temperature. Typical examples of the impurities include silicon oxide, magnesium oxide, sulfur oxide, organic substances, alkali metal oxides, alkaline earth metal oxides, titanium oxide, iron oxide, and alkali metal halidesCompounds, alkaline earth metal halides, alkali metal sulfates, alkaline earth metal sulfates, and the like substituted or dissolved in CaO or Al 2 O 3 Is a part of the material. But is not limited thereto.
In view of reactivity, the vitrification rate of the calcium aluminate used in the present application is preferably 70 mass% or more, more preferably 90 mass% or more. If the glass transition rate is less than 70 mass%, initial strength-exhibiting properties may be reduced. From the viewpoint of reactivity, the vitrification rate of calcium aluminate is preferably 70 mass% or more, more preferably 90 mass% or more. The vitrification rate was calculated by the following method: for the measurement sample, the main peak area S of the crystalline mineral was measured in advance by a powder X-ray diffraction method, and after heating at 1,000deg.C for 2 hours, gradually cooled at a cooling rate of (1-10deg.C)/min, and the main peak area S of the heated crystalline mineral was obtained by a powder X-ray diffraction method 0 Using these S 0 And S, the glass transition rate X is calculated by using the following formula.
Glass transition rate X (mass%) =100× (1-S/S 0 )
From the aspect of initial strength presentation, blaine specific surface area value of 3,000cm is preferable for the particle size of calcium aluminate 2 Preferably 5,000cm or more 2 And/g. When the particle size of calcium aluminate is not less than the above lower limit, the curing time becomes short, and the initial strength is excellent and the self-healing property is excellent.
The content ratio of the rapid hardening material used in the present application is preferably 1 part by mass or more and 30 parts by mass or less, more preferably 3 parts by mass or more and 25 parts by mass or less, and still more preferably 5 parts by mass or more and 20 parts by mass or less, with respect to 100 parts by mass of cement. In the case of containing calcium aluminate as the rapid hardening material, the content of calcium aluminate is preferably 2 parts by mass or more and 20 parts by mass or less, more preferably 3 parts by mass or more and 18 parts by mass or less, and still more preferably 4 parts by mass or more and 15 parts by mass or less, per 100 parts by mass of cement. By setting the content ratio of the rapid hardening material to the above lower limit value or more, early curability and cracking suppression effect can be easily obtained. In addition, the content ratio of the rapid hardening material is set to the above upper limit or less, whereby the strength can be improved. When the content ratio of the rapid hardening material is within the above range, the self-healing effect can be easily improved, and a repair mortar material satisfying the effect of the present application can be obtained.
The gas foaming material used in the present application means: the purpose of the present application is to prevent the grouting material in a non-solidified state from sinking and shrinking due to exudation after the construction of the grouting mortar composition. The gas foaming material used in the present application is not particularly limited as long as it generates a gas after kneading with water.
Examples of the gas foaming material include oily substances such as vegetable oil and mineral oil. Examples of the gas foaming material include a scaly aluminum powder surface-treated with stearic acid, and a powder material such as an aluminum powder produced by an atomization (atomization) method. The gas foaming material may be a nitrogen foaming material that foams nitrogen in an alkali atmosphere such as an azo compound, a nitroso compound, or a hydrazine derivative. Examples of the gas foaming material include percarbonates such as sodium percarbonate, potassium percarbonate and ammonium percarbonate, perborates such as sodium perborate and potassium perborate, permanganates such as sodium permanganate and potassium permanganate, and peroxides such as hydrogen peroxide.
As the gas foaming material used in the present application, aluminum powder surface-treated with stearic acid or the like is preferably used because of its great effect of suppressing sagging.
The nitrogen gas foaming material used as the gas foaming material used in the present application contains a compound that generates nitrogen gas by a reaction with an alkali generated when cement contained in a grouting material is kneaded together with water, and may generate gases such as carbon monoxide, carbon dioxide, and ammonia as by-products.
The nitrogen gas foaming material used in the present application is not particularly limited as long as it can be used for integrating with a structure, and can be used for suppressing the sinking and shrinkage of a grouting mortar in a state where it has not yet solidified, and can be used for improving the cracking resistance when placed in a dry state.
The content ratio of the gas foaming material is preferably 0.0001 to 1 part by mass, more preferably 0.0005 to 0.5 part by mass, and still more preferably 0.001 to 0.2 part by mass, per 100 parts by mass of cement. By setting the content ratio of the gas foaming material to the above lower limit value or more, a sufficient initial expansion effect can be imparted. In addition, the content ratio of the gas foaming material is set to the above upper limit or less, whereby the strength can be improved.
The water reducing agent used in the present application has an effect of helping dispersion of each material and imparting fluidity to the grouting mortar after refining.
The water reducing agent used in the present application is not particularly limited, and examples thereof include naphthalene-based water reducing agents, melamine-based water reducing agents, sulfamic acid-based water reducing agents, and polycarboxylic acid-based water reducing agents, and one or two or more of these water reducing agents may be used in the present application.
Specific examples of the water reducing agent include NMB co, ltd, trade name "Leobuild SP-9 series", mighty 2000 series ", and" Sunflow HS-100", which are manufactured by japan paper company. As the melamine-based water reducing agent, there may be mentioned "Sikament 1000 series" manufactured by Sika Japan, and "Sunflow HS-40" manufactured by Japan paper. Examples of the sulfamic acid water reducer include Fujisawa Pharmaceutical Co., ltd. Trade name "Paric FP-200 series". Examples of the polycarboxylic acid water reducer include NMB Co., ltd, trade names "Leobuild SP-8 series", grace Chemicals Co., ltd, trade names "Darlex-super-100PHX", and trade names "Chupole HP-8 series" and "Chupole HP-11 series" manufactured by bamboo oil and fat company.
Water reducers also exist in powder form. Specifically, examples of naphthalene-based water reducing agents include "Mighty 100" manufactured by king corporation, "Sanyo levolon P" manufactured by Sanyo chemical industry company, and "Cell flow110P" manufactured by first industry pharmaceutical company. Examples of the melamine-based water reducing agent include "Melent F10M" manufactured by BASF Pozzolite. Examples of the polycarboxylic acid water reducing agent include "Quinflow 750" manufactured by mitsubishi chemical company and "CAD9000P" manufactured by king company.
The content of the water reducing agent is preferably 0.1 part by mass or more and 2 parts by mass or less, more preferably 0.2 part by mass or more and 1.8 parts by mass or less, and still more preferably 0.3 part by mass or more and 1.0 part by mass or less, based on 100 parts by mass of cement. By setting the content ratio of the water reducing agent to the above lower limit or more, sufficient fluidity can be obtained. In addition, by setting the content ratio of the water reducing agent to the above upper limit or less, material segregation can be suppressed.
The fine aggregate used in the present application preferably has a CaO content of 85 mass% or more and a SiO content of 2 The ratio of (2) is 0.2 mass% or more and 15 mass% or less. As the chemical component of the fine aggregate, the CaO and SiO are mixed in the ratio 2 In the above range, a grouting material having high fluidity, neutrality resistance, adhesion strength to steel bars, and excellent rust resistance can be obtained.
The CaO content is preferably 87 mass% or more, more preferably 89 mass% or more, and still more preferably 91 mass% or more. The upper limit of the CaO proportion is not particularly limited, but is preferably 99 mass% or less, and more preferably 98.5 mass% or less.
SiO 2 The ratio of (c) is preferably 0.25 mass% or more and 13 mass% or less, more preferably 0.3 mass% or more and 11 mass% or less, and still more preferably 0.4 mass% or more and 10 mass% or less.
In order to make the chemical composition of the fine aggregate fall within the above-described range and the below-described range, silica sand, calcite as metamorphic rock, quartz as igneous rock, potash feldspar, and the like are mixed to prepare the fine aggregate. The chemical composition was confirmed by X-ray fluorescence diffraction and the respective rocks were mixed and adjusted so as to fall within the scope of the present application. The chemical components of the fine aggregate used in the present application are calculated in terms of oxide.
As the fine aggregate used in the present application, the same fine aggregate as that used in usual cement mortar and concrete can be used. That is, river sand, crushed stone, crushed sand, lime sand, silica sand, colored sand, artificial lightweight aggregate, and the like may be used, or they may be combined. In particular, silica sand or lime sand is preferably used for the purpose of improving fluidity and self-healing effect, and the fine aggregate particle size is preferably JIS6 to 8. By setting the particle size of the fine aggregate within the above range, sufficient fluidity and self-healing effect can be obtained.
The content ratio of the fine aggregate is preferably 40 parts by mass or more and 300 parts by mass or less, more preferably 45 parts by mass or more and 275 parts by mass or less, and still more preferably 50 parts by mass or more and 250 parts by mass or less, with respect to 100 parts by mass of cement. When the content ratio of the fine aggregate is within the above range, sufficient fluidity and self-healing effect can be obtained.
From the viewpoint of improving the self-healing effect, the grouting material of the present application may contain nitrite together with cement, an expansive material, a gas foaming substance, a water reducing agent, and a fine aggregate. The nitrite is not particularly limited, and examples thereof include lithium nitrite, sodium nitrite, potassium nitrite, calcium nitrite, magnesium nitrite, and barium nitrite, and among these, lithium nitrite and calcium nitrite which are excellent in self-healing effect and have no influence on alkali aggregate reaction are preferable. The form of nitrite is not particularly limited, and may be powder or solution.
The content of nitrite is preferably 2 parts by mass or more and 20 parts by mass or less, more preferably 5 parts by mass or more and 18 parts by mass or less, and still more preferably 7 parts by mass or more and 16 parts by mass or less, relative to 100 parts by mass of cement. By setting the nitrite content within the above range, fluidity can be improved and self-healing effect can be improved.
The grouting material of the present application may contain silica fine powder together with cement, an expansive material, a gas foaming material, a water reducing agent, and a fine aggregate from the viewpoints of improving strength presentation, improving acid resistance, securing pot life, and making dimensional stability good.
The silica fine powder includes latent hydraulic substances such as fine blast furnace slag powder and pozzolanic substances such as fly ash and silica fume, and among these, silica fume is preferable.
The kind of silica fume is not limited, but from the viewpoint of fluidity, it is more preferable to use a silica fume containing ZrO 10% or less 2 Silica fume and acidic silica fume as impurities. The acidic silica fume means: 1g of silica fume was put into 100cc of pure water and stirred, and the pH of the supernatant at this time showed an acidic silica fume of 5.0 or less.
The fineness of the silica fine powder is not particularly limited, and the blast furnace slag fine powder and fly ash are usually 3,000cm in terms of Blaine value 2 9,000cm above/g 2 In the range of not more than/g, the silica fume has a BET specific surface area of 2 ten thousand cm 2 30 ten thousand cm/g 2 In the range of/g or less.
The content ratio of the silica fine powder is preferably 1 part by mass or more and 20 parts by mass or less, more preferably 2 parts by mass or more and 15 parts by mass or less, and still more preferably 3 parts by mass or more and 10 parts by mass or less, relative to 100 parts by mass of cement. By setting the content of the silica fine powder to the above lower limit or more, strength-exhibiting property can be improved, acid resistance can be improved, pot life can be ensured, and dimensional stability can be improved. In addition, the content of the silica fine powder is set to the above upper limit or less, whereby fluidity can be improved and self-healing effect can be improved.
In the present application, one or more of a coagulant, an AE agent, an antirust agent, a hydrophobizing agent, an antimicrobial agent, a colorant, an antifreezing agent, limestone micropowder, a blast furnace gradually cooling slag micropowder, a mixed material such as sewage sludge incineration ash or its molten slag, municipal waste incineration ash or its molten slag, and pulp slag incineration ash, a defoaming agent, a tackifier, a shrinkage reducing agent, a fiber material such as steel fiber, vinylon fiber, carbon fiber, wollastonite fiber, a polymer, bentonite, a clay mineral such as sepiolite, and an anion exchanger such as hydrotalcite may be used in a range that does not substantially inhibit the object of the present application.
In the grouting material of the present application, the method of mixing the materials is not particularly limited, and the materials may be mixed at the time of construction, or a part or all of the materials may be mixed in advance.
As the mixing device, any conventional device such as a tilting mixer, omni mixer, henschel mixer, V-type mixer, and noda mixer can be used.
The grouting mortar composition of the application comprises the grouting material of the application and water, and is prepared by mixing the grouting material and the water.
The amount of the kneading water of the present application is not particularly limited, and is preferably 10 to 70 parts by mass, more preferably 14 to 65 parts by mass, and even more preferably 16 to 60 parts by mass, per 100 parts by mass of the grouting material, since the amount varies depending on the intended ■ application to be used and the content ratio of each material. By setting the amount of kneading water to the above lower limit or more, the reduction in fluidity can be suppressed, and the amount of generated heat can be suppressed to be extremely large. In addition, by setting the amount of kneading water to the above upper limit or less, strength-exhibiting properties can be ensured.
In the present application, the method of kneading the grouting material and water is not particularly limited, and a hand-held mixer having a rotational speed of 900rpm or more, a usual high-speed grouting mixer, or a biaxial forced mixer is preferably used.
The kneading by the hand mixer or the high-speed grouting mixer is preferably performed for 3 minutes or more by, for example, putting predetermined water into a vessel such as a barrel or the like in advance in the mixer, and then pouring the grouting mortar composition while rotating the mixer. Alternatively, for example, the grouting mortar composition is preferably preliminarily fed into the mixer, and the predetermined water is fed while the mixer is rotated, whereby the mixing is preferably performed for at least 4 minutes. When the kneading time is less than the predetermined time, adequate fluidity of the grouting mortar may not be obtained due to insufficient kneading.
The kneaded grouting mortar is usually pumped to a site of application by a manual injection gun, a diaphragm type hand pump, or a squeeze type mortar pump, and is filled to form a cured body using the grouting mortar composition of the present application.
Examples
The present application will be further described below based on experimental examples of the present application, but the present application is not limited thereto.
Experimental example 1
The grouting material is prepared in the following way: the cement comprises 11.1 parts by mass of an expansive material, 0.0025 parts by mass of a gas foaming material, and 0.5 parts by mass of a water reducing agent per 100 parts by mass of cement, and comprises a rapid hardening material, a fine aggregate, and a nitrite per 100 parts by mass of cement according to the mass shown in Table 1. Next, with respect to the grouting material, SO was measured by X-ray fluorescence diffraction 3 The MgO content was measured by X-ray fluorescence diffraction, and the measured value was taken into consideration to obtain SO as shown in Table 1 below in the final grouting material 3 Mixing SO-containing materials in such a way that the content of MgO and the content of SO-containing materials are equal 3 The additive (material name: potassium sulfate) and the MgO-containing additive (material name: magnesium carbonate) are mixed together to prepare the grouting material.
The grouting mortar composition was prepared by mixing 23 parts by mass of water with respect to 100 parts by mass of the obtained grouting material.
And measuring the fluidity and the self-healing effect of the prepared grouting mortar composition. The results are shown in Table 1.
< materials used >
■ And (3) cement: trial cement (various commercially available pure chemicals were used for adjustment of blending raw materials and chemical components in cement factories), blaine value 3,450cm 2 /g
■ Expansion material: is matched with CaO raw material and Al 2 O 3 Raw material, siO 2 Raw materials, caSO 4 Mixing and pulverizing raw materials, sintering at 1,200deg.C to obtain a frit, pulverizing into powder with a ball mill of 3,000cm based on Blaine specific surface area 2 And/g, thereby producing an expanded material. The identification and content of the tobermorite were calculated based on the chemical composition obtained by fluorescent X-ray and the identification result of powder X-ray diffraction. Tobermorite contained in 100 parts by mass of the expansive materialThe content is shown in Table 1.
■ Gas foaming material: scaly aluminum powder surface-treated with stearic acid and commercially available product
■ Water reducing agent: naphthalene water reducer and commercial product (first industry pharmaceutical Co., ltd. "Cell flow 110P")
■ Water: tap water
■ Fine aggregate: a fine aggregate obtained by mixing lime sand having a particle size of 50% or less of 0.6mm and a particle size of 50% of 0.6 to 1.2mm is used.
■ Fast hardening material a: used to form CaO43% and Al 2 O 3 Amorphous calcium aluminate obtained by adjusting 53% mode and melting ■ by an electric furnace for quenching, and having a vitrification rate of more than 98% and a Blaine specific surface area of 6,050cm 2 And/g, mixing 150 parts by mass of gypsum with respect to 100 parts by mass of calcium aluminate.
■ Fast hardening material B: calcium formate, reagent
■ Fast hardening material C: calcium nitrate, reagent
■ Nitrite: the amounts of the solid components are shown in table 1 by mass parts using an aqueous lithium nitrite solution and a solid component concentration of 40%.
< measurement item >
■ Fluidity: j at 30℃according to JSCE-F541 14 The funnel flow value was measured immediately after kneading and after 30 minutes.
■ Self-healing effect: according to JIS A6206, a grouting material was poured in a shape of 10cm X40 cm under reinforcement constraint conditions, and after 56 days of age, a strain gauge was attached to the surface of a test piece to conduct a bending test, and the bending test was terminated at a time point when a crack having a crack width of 0.1mm was generated. Then, the following cycle was repeated 5 times: after standing at 35℃for 28 days with 98% by mass humidity, standing at 20℃for 7 days with 60% by mass humidity. The self-healing effect was confirmed by measuring the proportion of the area blocked by the crack (blocked area/area where the crack occurred).
TABLE 1
TABLE 1
As can be seen from the results of Table 1, by containing a specific amount of SO 3 MgO, the fluidity and self-healing effect were high.
Industrial applicability
The grouting material of the application is prepared by containing a specific amount of SO 3 MgO, a grouting material, a grouting mortar composition and a grouting method thereof, which have high fluidity and self-healing effect, can be provided, and can be widely used in steel plate vertical construction methods of piers, filling construction methods of large pier seats, fixing materials of reinforcing steel bars, other gap filling, repairing of concrete sections, self-leveling floor materials and the like, civil ■ building applications and the like.

Claims (8)

1. A grouting material comprising cement, an expansion material, a gas foaming substance, a water reducing agent and fine aggregate, wherein the expansion material contains tobermorite.
2. The grouting material of claim 1, wherein SO 3 The amount of (2) is 0.5 to 10.0 mass%, and the amount of MgO is 0.1 to 3.0 mass%.
3. The grouting material according to claim 1 or 2, wherein the content of the tobermorite is 0.05 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the swelling material.
4. The grouting material according to claim 1 to 3, further comprising a rapid hardening material,
the rapid hardening material comprises calcium aluminate,
CaO/Al of the calcium aluminate 2 O 3 The molar ratio is 1.2 to 3.0,
the content of the calcium aluminate is 2 to 20 parts by mass based on 100 parts by mass of the cement.
5. The grouting material according to any one of claims 1 to 4, wherein the fine aggregate is contained in an amount of 40 to 300 parts by mass based on 100 parts by mass of the cement.
6. The grouting material according to claim 1 to 5, further comprising nitrite,
the nitrite is contained in an amount of 2 to 20 parts by mass based on 100 parts by mass of cement.
7. A grouting mortar composition comprising the grouting material according to any one of claims 1 to 6 and water.
8. A cured product obtained by using the grouting mortar composition according to claim 7.
CN202280030079.5A 2021-04-26 2022-03-31 Grouting material, grouting mortar composition and cured body Pending CN117177952A (en)

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