JP5972079B2 - Capsule for fixing an element containing a rapid hardening component - Google Patents

Description

  The present invention relates to an element fixing capsule for fixing an element such as a deformed reinforcing bar, a PC strand, a rod-shaped body made of carbon fiber or an aramid fiber, and an anchor bolt or a lock bolt in a perforation.

  2. Description of the Related Art Conventionally, fixing materials have been used that drill holes in hard members such as concrete, stone, bricks, blocks, and rocks in the fields of architecture and civil engineering, and fix elements such as reinforcing bars, anchor bolts, and lock bolts.

  The fixing method of the element is divided into a method of fixing and fixing the tip of the anchor bolt when embedded, such as a metal anchor bolt, and a method of fixing the periphery of the element with an adhesive material. They are divided into organic fixing materials and inorganic fixing materials.

  Anchor fixing that suppresses the insertion resistance when placing anchors by placing a hydraulic substance containing cement and calcium aluminate in an anchor-breaking container using heatron paper as an inorganic fixing material The material is known (Patent Document 1).

  Also, element fixing comprising cement, calcium aluminosilicate glass or calcium aluminate glass, gypsum, aggregate, colloidal silica, microfibrillated fibrous cellulose, water, and setting retarder in an easily destructible container. Capsule for use is known (Patent Document 2).

  Furthermore, a quick-hardening cement composition for an anchor element fixing material comprising an alkali metal carbonate, an aluminate, an inorganic compound, calcium aluminate, and a water retention substance is known (Patent Document 3).

When fixing the inorganic fixing material described in Patent Documents 1 to 3 to perforations, the cement composition containing cement, calcium aluminate, and aggregate is allowed to absorb water. In this case, it may be stored for a long time in a state where water and aggregate are mixed, the aggregate and water are separated, and the fixing material cannot be uniformly mixed, and the element may not be completely fixed to the perforation. is there.
In addition, in order to reduce the noise at the time of reinforcing bar fixation, when only the rotation without hitting and the perforation length has to be doubled, the rebar is not completely driven into the perforation. There was a problem that it could not be fixed as there was.
Moreover, there also existed a subject that the elongation of the compression strength of the hardening body containing the rapid-hardening component was small.

  In Patent Documents 1 to 3, a powder material containing cement, calcium aluminate glass or calcium aluminosilicate glass, and a rapid hardening component made of gypsum, spherical silica, colloidal silica, calcium hydroxide In addition, there is no description about the capsule for device fixing containing an aqueous material containing water.

On the other hand, spherical silica is used in epoxy resin fillers for semiconductor sealants, fillers of various resins of engineering plastics such as silicone, phenol, and polyester, and cosmetics.
Although the construction method of the injection material which inject | pours into a rock mass etc. using spherical silica and slaked lime together is proposed, it does not use together with rapid hardening components, such as a calcium aluminate (patent document 4).

JP 2011-0779708 A JP 2009-114000 A JP 2006-335586 A JP 2011-059044 A

  The present invention can stably store an inorganic fixing material stored in a container without long-term material separation, and when fixing an element in a perforation using water, cement, a rapid hardening component, etc. Inorganic fixing that can be mixed evenly and easily, only by rotation, and even if the perforation length is doubled, a predetermined tensile force can be obtained without leaving the element, greatly increasing long-term strength It is an object to provide a material (capsule for element fixing).

  As a result of intensive studies, the present inventor has obtained knowledge that the above problem can be solved by using a specific capsule containing cementum containing a rapid hardening component, and completes the present invention. It came to.

The present invention employs the following means in order to solve the above problems.
(1) An element fixing capsule comprising a two-layer easily breakable container containing a powder material and an aqueous material, wherein the powder material comprises cement, calcium aluminate glass or calcium aluminosilicate glass, and , A hard component made of gypsum, the aqueous material contains spherical silica, colloidal silica, calcium hydroxide, and water, and the powder material and / or the aqueous material contains an aggregate. The element fixing capsule is characterized by the following.
(2) The element fixing capsule according to (1), wherein the spherical silica is 40 to 120 parts with respect to 100 parts of water.
(3) The element fixing capsule according to (1) or (2), wherein the colloidal silica is 0.3 to 14 parts in terms of solid content with respect to 100 parts of water.
(4) The element fixing capsule according to any one of (1) to (3), wherein the calcium hydroxide is 0.01 to 0.3 part with respect to 100 parts of water.
(5) The element fixing device according to any one of (1) to (4), wherein the container is a capsule A containing the aqueous material and a capsule B containing the powder material. It is a capsule.
(6) In the case the material is glass capsule A, the material of the capsule B is an element fixing capsule before SL (5), which is a film.
(7) The element fixing capsule according to any one of (1) to (6), wherein the element is a reinforcing bar.

  The capsule containing the cement of the present invention, calcium aluminate glass or calcium aluminosilicate glass, gypsum, hard silica, spherical silica, colloidal silica, and calcium hydroxide, even if stored for a long time, material separation, especially In the case where the element is fixed in the perforation without separation of the aggregate, fixing is facilitated without leaving the element even if the perforation length is doubled only by rotation, and the tensile force is increased for a long time. .

The present invention will be described in detail below.
The parts used in the present invention are based on mass unless otherwise specified.

  The cement used in the present invention is usually a variety of commercially available ordinary, early strong, moderately hot, low heat, and very early strong portland cements, and various portland cements mixed with fly ash, blast furnace slag, etc. Cement, eco-cement and the like can be mentioned, and these can be used after being finely powdered.

The calcium aluminate glass (hereinafter referred to as “CA glass”) used in the present invention is a mixture of a raw material containing calcia (CaO) and a raw material containing alumina (Al ₂ O ₃ ), and is fired in a kiln. It is a general term for substances having CaO and Al ₂ O ₃ as main components and having hydration activity, which are obtained by heat treatment such as melting in an electric furnace.
CA glass is a glassy material obtained by, for example, quenching a melt with compressed air, high-pressure water, or the like.
The proportions of CaO and Al ₂ O _{3 in} the CA glass are not particularly limited, but from the viewpoint of rapid hardening and workability, CaO 30 to 70 parts and Al ₂ O ₃ 30 to 70 parts are preferable.
Further, the vitrification ratio in the CA glass is preferably 80% or more from the viewpoint of good strength development.
The particle size of the CA glass is preferably 3,000 cm ² / g or more in terms of a specific surface area of brain (hereinafter referred to as “brain value”) from the viewpoint of rapid hardening and initial strength development.

The calcium aluminosilicate glass (hereinafter referred to as “CAS glass”) used in the present invention is a raw material containing calcia (CaO), a raw material containing alumina (Al ₂ O ₃ ), and a raw material containing silicon oxide (SiO ₂ ). Is a general term for substances that have hydration activity, with CaO, Al ₂ O ₃ , and SiO ₂ as the main components, obtained by heat treatment such as baking in a kiln or melting in an electric furnace. is there.
CAS glass is, for example, glassy obtained by quenching a melt with compressed air, high-pressure water, or the like.
The proportions of CaO, Al ₂ O ₃ , and SiO _{2 in} the CAS glass are not particularly limited, but from the viewpoint of rapid hardening, workability, and long-term development, 30 to 60 parts of CaO, Al ₂ O ₃ 20 60 parts, and SiO ₂ 5 to 25 parts are preferred.
Further, the vitrification rate in the CAS glass is preferably 80% or more from the viewpoint of good strength development.
The particle size of CAS glass is preferably 3,000 cm ² / g or more in terms of brain value from the viewpoint of rapid hardening and initial strength development.

Although any commercially available gypsum can be used in the present invention, type II anhydrous gypsum is preferable in terms of strength development, and natural anhydrous gypsum and by-product anhydrous gypsum can be used.
The particle size of gypsum is preferably 3,000 cm ² / g or more in terms of brain value in terms of initial strength development.
The amount of gypsum used is preferably 30 to 80 parts out of 100 parts of a rapid hardening component made of CA glass or CAS glass and gypsum from the viewpoint of initial strength development and long-term strength development.

  The used amount of the rapid hardening component is preferably 5 to 30 parts in 100 parts of the binder composed of cement and the rapid hardening component. If it is less than this range, the initial strength development may be small, and if it is more than this range, the long-term strength may be small.

  In the present invention, a setting retarder can be used from the viewpoint of maintaining workability during element fixing. The setting retarder can be used in powder form.

  Examples of the setting retarder include oxycarboxylic acids and alkali metal carbonates. Among these, it is preferable to use oxycarboxylic acids and alkali metal carbonates in combination because the curing time can be controlled and the strength development after curing is good.

  Oxycarboxylic acids are oxycarboxylic acids or salts thereof. Specifically, oxycarboxylic acids such as citric acid, gluconic acid, tartaric acid and malic acid, or one or more of these salts can be used. The salt is preferably a sodium salt or potassium salt. Of these, gluconic acid and tartaric acid are preferred because they increase the setting time in direct proportion to the amount used, are easy to control, and form a complex salt with the calcium component when the setting retarder is slurried, and are difficult to precipitate.

Examples of the alkali metal carbonates (hereinafter referred to as “alkali carbonate”) include carbonates such as lithium carbonate, sodium carbonate, and potassium carbonate, and bicarbonates such as sodium bicarbonate and potassium bicarbonate. In terms of good strength development after curing, alkali metal carbonates are preferred, and potassium carbonate is more preferred.
When the oxycarboxylic acid and the alkali carbonate are used in combination, the mixing ratio of the oxycarboxylic acid and the alkali carbonate is preferably 5 to 200 parts of the oxycarboxylic acid with respect to 100 parts of the alkali carbonate from the viewpoint of control of the curing time and strength development.

  Since the amount of the setting retarder varies depending on the working time and temperature of the element fixing, it is difficult to determine uniquely. From the viewpoint of control of the curing time and strength development, 0.1 to 5 parts is usually preferable with respect to 100 parts of the binder made of cement, CA glass or CAS glass and gypsum.

Although the aggregate used in the present invention depends on the perforation diameter and the clearance of the element, a fine aggregate having a maximum particle size of 5 mm or less is usually used.
Examples of the aggregate include natural sand, quartz sand, lime sand, and the like, but a hard aggregate having a Mohs hardness of 5 or more is preferable from the viewpoint of improving the crushability of the glass and obtaining high strength. Specific examples include hard pottery, hard porcelain, metal, natural or artificial corundum (steel ball), emery, orthofeldspar, fused quartz, yellow jade, fused alumina, and fused zirconia.
The amount of the aggregate used is preferably 5 to 200 parts with respect to 100 parts of the binding material from the viewpoint of element tensile force and ease of fixing.

The spherical silica used in the present invention is a white powder obtained by melting pulverized raw material silica in a high-temperature flame and spheroidizing it by surface tension, and is expressed as SiO ₂ . Also called fused silica.
Spherical silica is used for epoxy resin fillers for semiconductor encapsulants, fillers for various plastics of engineering plastics such as silicone, phenol and polyester, and cosmetics.
The specific surface area of the spherical silica is preferably 5 to ²⁰ m ² / g by the BET method from the viewpoints of the effect of preventing the separation of the aggregate, the effect of enhancing the long-term strength, the ability to fill the capsule, and the mixing property of the binder and water.
The amount of spherical silica used is preferably 40 to 120 parts per 100 parts of water. If the amount is less than this range, the effect of preventing the separation of the aggregate may not be obtained. If the amount is more than this range, the viscosity increases, and the capsule may not be filled properly or the binder and water may not be sufficiently mixed. .

Colloidal silica is used as a raw material for IC flattening abrasives, silicon wafer abrasives, various coating fillers, and synthetic glass, and is also used for spraying heat-insulating refractories.
The colloidal silica used in the present invention is a fine particle having a particle size of about 10 to 20 μm. In order to remove the impurities from the silicic acid compound to obtain an anhydrous silicic acid compound sol and maintain stability, the pH is adjusted to 9-11 and the aqueous solution concentration is 20-40%.
Colloidal silica is usually used by being dispersed in water.
As for the usage-amount of colloidal silica, 0.3-14 parts is preferable in conversion of solid content with respect to 100 parts of water. When the solid content conversion value is less than this range, the effect of accelerating the curing reaction may not be obtained. When the solid content conversion value is more than this range, the curing reaction is too early, and the mixing of the binder and water may be insufficient.

The calcium hydroxide used in the present invention is a calcium hydroxide represented by the chemical formula Ca (OH) ₂ and is also called slaked lime. The solid is an ionic crystal composed of calcium ions and hydroxide ions. The aqueous solution exhibits strong alkalinity and is also used as a reagent for simply detecting carbon dioxide.
Calcium hydroxide is also used as a neutralizing agent and a coagulant for removing sulfur oxides from the exhaust gas of thermal power plants and acidifying rivers and soils. In addition, calcium hydroxide kneaded with sand and seaweed extract is called plaster and is applied to walls and ceilings. Although it takes time to harden, it is effective as a long-lasting interior and exterior material. This is because calcium carbonate is produced by absorbing carbon dioxide in the air in order to solidify.
The specific surface area of calcium hydroxide (hereinafter referred to as “slaked lime”) is preferably 10 to 50 m / g by the BET method. If it is smaller than this range, the effect of preventing the separation of the aggregate may not be obtained, and if it is larger than this range, the viscosity is too large, and the capsule is poorly filled or the mixing of the binder and water is insufficient. There is.
As for the usage-amount of slaked lime, 0.01-0.3 part is preferable with respect to 100 parts of water. If the amount is less than this range, the effect of preventing the separation of the aggregate may not be obtained. If the amount is more than this range, the viscosity is too high, and the capsule may not be properly filled or the cement and water mixture may be insufficient. .

The water used in the present invention may be water as long as it does not hinder the hydration of the binder made of cement, CA glass or CAS glass, and gypsum, and tap water is usually used.
In the present invention, the water binder ratio (W / P) is preferably 30 to 55%. If the amount is less than this range, the viscosity of the cement increases, and workability and workability may be reduced. If the amount is more than this range, a predetermined tensile strength may not be obtained.

In the present invention, it is further possible to use a water reducing agent.
Water reducing agents are fluids that can be used as liquids or powders. Specific examples include lignin sulfonates and their derivatives, and high performance AE water reducing agents and high performance water reducing agents. One or more of these can be used. Among these, a high performance AE water reducing agent is preferable in terms of high fluidity.

  High-performance AE water reducing agents and high-performance water reducing agents include polyol derivatives such as polyethylene glycol, aromatic sulfonic acid-based high-performance water reducing agents, polycarboxylic acid-based high-performance water reducing agents, poly (ethylene glycol) chains, Examples thereof include ether-based high-performance water reducing agents, melamine-based high-performance water reducing agents, and mixtures thereof. Among these, aromatic sulfonic acid-based high-performance water reducing agent, polycarboxylic acid-based high-performance AE water-reducing agent, and polyether-based high-performance water reducing agent are advantageous in that they have a large setting retarding effect, fluidity, and kneading performance. preferable.

  The amount of the water reducing agent used is preferably 0.01 to 3 parts in terms of solid content with respect to 100 parts of the binder from the viewpoint of mortar workability and initial strength development.

In the present invention, spherical silica, colloidal silica, and slaked lime water-based material are enclosed in a container to form capsule A, and this capsule A and cement, CA glass or CAS glass, and gypsum powder material are enclosed in the container. Thus, capsule B is preferable.
Aggregates can also be blended in capsule A with spherical silica, colloidal silica, and slaked lime aqueous materials, and blended into cement, CA glass or CAS glass, and gypsum powder materials. It is also possible to encapsulate the capsule B.
The setting retarder is preferably blended into the powder material.

  The container of the present invention is easily destructible, and examples thereof include glass, ceramics, porcelain, plastic, film, and paper.

As the container for capsule A containing water, glass, ceramics, porcelain, plastics, and films that are completely sealed and reliably preserved are desirable.
Moreover, as a container of the capsule B containing the powder material such as cement, CA glass or CAS glass, gypsum, and aggregate, and encapsulating the capsule A, glass, ceramic, porcelain, plastic, film, and paper Can be used.

  The size of the capsule cannot be uniquely determined depending on the place where it is used, but a capsule having a diameter of 10 to 40 mm and a length of 100 to 355 mm is usually used.

Borosilicate glass is desirable because glass has little alkali elution, is thin, and has excellent durability. A borosilicate glass having a low chemical content of Na ₂ O is more desirable for stability after capsule fixing.
Examples of the film include a polyethylene film, a polypropylene film, and a nylon film, and a single material or a laminate of two or more kinds can be used.
The thickness of the film is about 50 to 150 μm.

It is preferable from the viewpoint of material separation prevention that water, aggregate, spherical silica, colloidal silica, and slaked lime to be encapsulated in the capsule A are encapsulated in advance.
Moreover, it is preferable that cement, CA glass or CAS glass, gypsum, and a setting retarder are mixed in advance and then sealed in the container.

  The aggregate is usually encapsulated in spherical silica, colloidal silica, slaked lime and capsule A, but can also be encapsulated in a capsule B by blending with a binder.

  The element fixing capsule of the present invention may be used in a normal element fixing method. For example, a hardened concrete body is perforated, a capsule is inserted into the hole, and, for example, a reinforcing bar serving as an element is rotated to encapsulate the capsule. The element can be fixed by embedding while crushing and mixing.

As elements used in the present invention, deformed reinforcing bars, PC strands, rods made of carbon fiber or aramid fiber, anchor bolts, lock bolts, and the like can be used.
The shape of the element has a shape that allows good adhesion, and the tip can be crushed and mixed with a capsule, and a 45 ° cut product, a V cut product, or the like is preferable.

  Hereinafter, the present invention will be described in detail with experimental examples, but the present invention is not limited to these experimental examples.

Reference Example A reference test was performed to show that the separation of aggregates was reduced by using three components of spherical silica, colloidal silica, and slaked lime in combination.
Inner tube diameter 26mm x length 324mm, bottom is flat bottom, open top is cylindrical and straight glass tube stands vertically, water 100 parts, aggregate 400 parts, antifoam 0.5 parts, and water reducing agent 1.3 Part and the three components shown in Table 1 are uniformly mixed using a homojester to prepare an aqueous material, and the aqueous material is filled into a vertically standing glass tube while expelling air. Was evaluated and the degree of aggregate separation was evaluated. The results are also shown in Table 1.

<Materials used>
Spherical silica a: fused silica, density 2.21 g / cm ³ , specific surface area 13.45 m ² / g
Colloidal silica: 40% concentration, pH 10.0, density 1.21 g / cm ³ , commercial product,
Slaked lime A: Reagent, specific surface area 30m ² / g
Aggregate: Silica No. 4, No. 5 equivalent mixed product, Mohs hardness 7, maximum particle size 5mm or less Water: Tap water reducing agent: Polycarboxylic acid-based high-performance AE water reducing agent, powdered silica fume: Ferrosilicon by-product, Density 2.27g / cm ³ , specific surface area 18.45m ² / g
Antifoaming agent: Emulsion type silicone antifoaming agent, commercial product

<Measurement method>
Specific surface area: Measured according to BET method, JIS Z 8830. Filling workability: Evaluates filling ability into capsules, “good” when clean filling is possible, “good” when filling is possible but takes time, when filling is not possible Is "impossible"
Aggregate separation degree: 50 g of the mixed aqueous material was collected, washed with water on a 44 μm sieve, and the mass of the aggregate dried at 110 ° C. was defined as the amount of aggregate before standing. On the other hand, the mixed water-based material is filled in a cylindrical glass tube with an inner tube diameter of 26 mm × length of 324 mm, a lower end with a flat bottom, and an open upper end and a straight opening, and after standing for one month, 50 g was collected from the upper end of the glass tube, and the amount of aggregate measured in the same manner was taken as the amount of aggregate after standing for 1 month. The aggregate amount before standing and the aggregate amount after standing for one month were compared to determine the degree of aggregate separation.
Aggregate separation = Aggregate amount after standing for 1 month / Aggregate amount before standing: Aggregate separation degree is 0.90 or more, filling workability is “good”, aggregate separation degree is 0.90 As described above, the filling workability was evaluated as “possible”, and the aggregate separation degree of 0.90 or less was regarded as “impossible”.

From Table 1, the following is clear.
Colloidal silica and slaked lime can be used alone or in combination with the two components, and the aggregate is separated (Experiment No. 1-2, Experiment No. 1-3, and Experiment No. 1). 1-5) However, spherical silica halves the separation when used alone or in combination with other components (Experiment No. 1-4, Experiment No. 1-6, and Experiment No. 1). 7). When the three components of spherical silica, colloidal silica, and slaked lime are used in combination, there is no separation of the aggregate (Experiment No. 1-8 to Experiment No. 1-24).
When the amount of spherical silica in the three components is appropriate, filling workability is good and there is no separation of aggregate, which is more preferable (Experiment No. 1-21 to Experiment No. 1-23).

Experimental example 1
A glass tube A having an inner tube diameter of 11.5 mm and a length of 135 mm was filled with 26.8 g of the water-based material shown in Table 1 and uniformly dispersed therein.
Glass tube A is loaded into a glass tube B having an outer diameter of φ16.7 mm and a length of 138 mm. From the glass tube A and the gap between the glass tubes B, 80 parts of cement, 10 parts of CA glass, and 10 parts of plaster 18.4 g of a powder material in which 100 parts of the binder and 0.5 part of the setting retarder were mixed was filled to prepare an encapsulated glass tube capsule B, and the glass tube was set up vertically for 2 weeks.
A horizontal hole with a hole diameter of 20 mm and a depth of 200 mm was made in a concrete wall. After inserting the capsule B into the perforation, a D16 mm reinforcing bar (material SD345) whose tip was cut at 45 ° C. was driven only by rotation using a drill. After 24 hours, a rebar tensile test was performed. The results are also shown in Table 2.

<Materials used>
Cement: Early-strength Portland cement, 3 kinds of mixture, Blaine value 4,550cm ² / g, Density 3.14g / cm ³
CA glass: CaO / Al ₂ O ₃ = 49/51, vitrification rate 100%, brain value 4,410 cm ² / g, density 2.90 g / cm ³
Gypsum: crushed product of type II anhydrous gypsum, brain value 4,520cm ² / g
Setting retarder: Mixture of gluconic acid / potassium carbonate mass ratio 3/7

<Measurement method>
Brain value: Measured in accordance with JIS R 5201 7.1 (specific surface area) Reinforcing bar placement time: From the beginning of the rebar rotation to the time the rebar is inserted to the marked position, or until no more reinforcing bars are inserted Time (seconds)
Reinforcing bars: distance between the marked position of the reinforcing bars and the concrete wall (mm)
Tensile load (KN): Measured using JCAA (Japan Architecture Post-construction Anchor Association), “Standard test method of post-construction anchor (adhesion test of adhesive anchor set test method)”, load cell, displacement meter, and data logger , 1-day displacement: Measure the amount of displacement up to the yield load when the rebar breaks, or up to the maximum load when the rebar does not break, using a displacement meter (unit: mm).

From Table 2, the following is clear.
Spherical silica, colloidal silica, and slaked lime are immiscible (Experiment No.2-1), and colloidal silica and slaked lime are used alone (Experiment No.2-2 and Experiment No.2-3). I can't. Construction using either spherical silica alone (Experiment No.2-4) or a combination of spherical silica and colloidal silica or slaked lime (Experiment No.2-6 or Experiment No.2-7) is possible. Compared to the combination of colloidal silica and slaked lime (Experiment No. 2-5), the rebar driving time is shorter, the rebar is not left behind, and the tensile load is larger.
The combination of spherical silica, colloidal silica, and slaked lime (Experiment No.2-8 to Experiment No.2-24) has a short rebar driving time, no rebar leftover, and a large tensile load. Is preferable.
When the amount of spherical silica in the three components is appropriate, the rebar driving time is short, the rebar is not left behind, the tensile load is large, and the displacement of the rebar is small, which is more preferable (Experiment No. 2-21 to Experiment No. 2). 2-23).

Experimental example 2
The same procedure as in Experimental Example 1 was performed except that CAS glass was used instead of CA glass and spherical silica, colloidal silica, and slaked lime shown in Table 3 were blended. The results are shown in Table 3.

<Materials used>
CAS glass: CaO / Al ₂ O ₃ / SiO ₂ = 50/40/10, vitrification rate 100%, brain value 4,630 cm ² / g
Density 2.89g / cm ³

From Table 3, the following is clear.
The combination of spherical silica, colloidal silica, and slaked lime (Experiment No.3-4 to Experiment No.3-7) has less time to drive the rebar, no leftover of the rebar, and large tensile load. .

Experimental example 3
Spherical silica, colloidal silica, and slaked lime shown in Table 4 were used, the material of the reinforcing bar was changed from SD345 to SD490, and the age of the tensile test was changed to 1 year. The results are also shown in Table 4.

<Materials used>
Spherical silica b: fused silica, density 2.21 g / cm ³ , specific surface area 5.12 m ² / g
Spherical silica c: fused silica, density 2.21 g / cm ³ , specific surface area 19.5 m ² / g
Slaked lime B: Fine powder slaked lime, specific surface area 50m ² / g
Slaked lime C: Fine slaked lime, specific surface area 25m ² / g
Slaked lime D: Fine slaked lime, specific surface area 10m ² / g
Slaked lime E: Special industrial slaked lime, specific surface area 0.3 m ² / g

From Table 4, the following is clear.
When the amount of spherical silica is increased in a system using three components of spherical silica, colloidal silica, and slaked lime, the rebar driving time is shortened, the rebar displacement is reduced, and the long-term tensile load is increased (Experiment No. .4-1 to Experiment No. 4-6).
In addition, when the spherical silica particle size is reduced, the rebar driving time is shortened, the displacement of the rebar is reduced, and the long-term tensile load is increased (Experiment No. 4-8).
When the particle size of slaked lime is reduced, the rebar driving time is shortened, the displacement of the rebar is reduced, and the long-term tensile load is increased (Experiment No. 4-9).

Experimental Example 4
28.2 powder material in which 100 parts of binder consisting of 80 parts of cement, 10 parts of CA glass and 10 parts of gypsum and 0.5 part of a setting retarder are mixed with glass tube A with an inner tube diameter of 14.0 mm x length of 180 mm g was enclosed.
Glass tube A is loaded into nylon polyethylene film multilayer product B with outer diameter φ17.5mm × length 200mm, and the three components shown in Table 5 are placed in the gap between glass tube A and nylon polyethylene film multilayer product B. 23.0 g of an aqueous material prepared by uniformly mixing with a homogenster was enclosed. The capsules were stored in the same manner as in Experimental Example 1, tested, and the results are also shown in Table 5.

From Table 5, the following is clear.
When there is little spherical silica, colloidal silica, or slaked lime in the three components (Experiment No.5-1, Experiment No.5-6, or Experiment No.5-13), and the spherical silica, colloidal silica in the three components, Or if there is a lot of slaked lime (Experiment No.5-5, Experiment No.5-12 or Experiment No.5-17), there will be no rebar leftover, but the rebar placement time will be longer and the displacement of the rebar will be Become more.
In addition, when the appropriate amount of spherical silica and slaked lime in the three components is used, the rebar driving time is short, the rebar is not left behind, and the displacement of the rebar is small (Experiment No. 5-2 to Experiment No. 5-4). Experiment No. 5-7 to Experiment No. 5-11 and Experiment No. 5-14 to Experiment No. 5-16).

Claims (7)

  A capsule for fixing an element comprising a two-layer easily breakable container containing a powder material and an aqueous material, wherein the powder material is made of cement, calcium aluminate glass or calcium aluminosilicate glass, and gypsum. The aqueous material contains spherical silica, colloidal silica, calcium hydroxide, and water, and the powder material and / or the aqueous material contains an aggregate. Capsule for fixing elements.   2. The element fixing capsule according to claim 1, wherein the spherical silica is 40 to 120 parts by mass with respect to 100 parts by mass of water.   The element fixing capsule according to claim 1, wherein the colloidal silica is 0.3 to 14 parts by mass in terms of solid content with respect to 100 parts by mass of water.   The element fixing capsule according to any one of claims 1 to 3, wherein the calcium hydroxide is 0.01 to 0.3 parts by mass with respect to 100 parts by mass of water.   The device fixing capsule according to any one of claims 1 to 4, wherein the container is a capsule A containing the aqueous material and a capsule B containing the powder material. 6. The element fixing capsule according to claim 5 , wherein the material of the capsule A is glass, and the material of the capsule B is a film. The element fixing capsule according to claim 1, wherein the element is a reinforcing bar.