CN111646734A - Epoxy resin cementing material for slow-bonding prestressed tendon and use method thereof - Google Patents
Epoxy resin cementing material for slow-bonding prestressed tendon and use method thereof Download PDFInfo
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- CN111646734A CN111646734A CN202010480541.4A CN202010480541A CN111646734A CN 111646734 A CN111646734 A CN 111646734A CN 202010480541 A CN202010480541 A CN 202010480541A CN 111646734 A CN111646734 A CN 111646734A
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- epoxy resin
- slow
- cementing material
- prestressed tendon
- bonding prestressed
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/14—Polyepoxides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/12—Esters; Ether-esters of cyclic polycarboxylic acids
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00525—Coating or impregnation materials for metallic surfaces
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00637—Uses not provided for elsewhere in C04B2111/00 as glue or binder for uniting building or structural materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
An epoxy resin cementing material for a slow-bonding prestressed tendon comprises bisphenol A epoxy resin, dicyandiamide, a toughening agent, a diluent and a filler; the mixture is uniformly stirred and fully ground to obtain a cementing material slurry; the prepared slurry is used as a cementing material of the slow-bonding prestressed tendon which needs to be cured by heating. The cementing material has good stability at room temperature, the working life is 6-12 months, and the stable performance of the slow-bonding prestressed tendon from the production to the tensioning period can be ensured. The epoxy resin cementing material is quickly cured by a heating method, so that the steel strand is bonded with the concrete in time according to the requirement.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an epoxy resin cementing material for a slow-bonding prestressed tendon and a use method thereof.
Background
The slow adhesion prestressing technique is a prestressing technique that is rapidly developed following the adhesion prestressing technique and the unbonded prestressing technique. The slow-bonding prestress is convenient to construct, has excellent mechanical property and durability, is more and more widely applied in the technical field of prestress, and is popular with design, construction and construction units.
A core problem of the retarded adhesive prestress technology is whether the cementing material can be bonded in time according to requirements, which is the key for realizing smooth tensioning of retarded adhesive prestress and timely bonding and curing. Due to the cementing material, the slowly-bonded prestressed steel strand often has the technical problem of early or late bonding in engineering use.
The main technical problems of the existing cementing material are as follows: at present, the service life of the cementing material adopted by the widely-used slow-bonding prestressed tendon in China is short (generally 3-12 months), the curing time is greatly influenced by the environmental stability, and the curing time is shorter as the temperature is higher. A plurality of links exist from production to tensioning of the slowly-bonded prestressed tendons, the intermediate interval time is long, and the service life of the cementing material is difficult to meet the requirement of tensioning of the prestressed tendons. Meanwhile, after tensioning is finished, the cementing material is delayed and not cured, the steel strand cannot be effectively bonded with concrete, and the project cannot be delivered on time.
At present, the method comprises the following steps: the patent 2009100869497 discloses a delayed coagulation adhesive for slowly-bonded prestressed tendons, the patent 2011101838205 discloses a high-performance delayed coagulation material for slowly-bonded prestressed tendons and a preparation method thereof, the patent 2011101980585 discloses an adhesive for slowly-bonded prestressed steel strands, and the patent 2015101875518 discloses a delayed coagulation adhesive for slowly-bonded prestressed tendons and a preparation method thereof, which can not control the delayed coagulation adhesive in real time to enable the delayed coagulation adhesive to be rapidly cured.
Disclosure of Invention
The invention aims to solve the technical problem of providing an epoxy resin cementing material for a slow-bonding prestressed tendon and a using method thereof aiming at the defects of the existing cementing material for the slow-bonding prestressed tendon. The epoxy resin cementing material for the slow-bonding prestressed tendon and the use method thereof have the advantages that the cementing material has long service life, the curing time of the cementing material is controlled by heating, and the slow-bonding prestressed tendon can be favorably tensioned smoothly and the prestressed tendon can be effectively bonded with concrete in time according to requirements after being tensioned.
The technical scheme adopted by the invention is as follows:
the epoxy resin cementing material for the slow-bonding prestressed tendon is characterized by comprising the following components in parts by weight: the adhesive comprises, by weight, 100 parts of bisphenol A epoxy resin, 4-12 parts of dicyandiamide, 5-15 parts of a toughening agent, 10-25 parts of a diluent and 50-200 parts of a filler; adding a toughening agent, a diluent and dicyandiamide into bisphenol A epoxy resin, uniformly stirring, adding a filler, uniformly stirring, and fully grinding the mixture to obtain a cementing material slurry; the prepared slurry is used as a cementing material of the slow-bonding prestressed tendon which needs to be cured by heating.
Further, the epoxy resin cementing material for the slow-bonding prestressed tendon comprises 6-8 parts of dicyandiamide.
Furthermore, the epoxy resin gel material for the slow-bonding prestressed tendon is one or a mixture of two of bisphenol A epoxy resin E44 and E51.
Furthermore, the filler of the epoxy resin cementing material for the slow-bonding prestressed tendon is one or a mixture of two of cement and calcium carbonate powder.
The use method of the epoxy resin cementing material for the slow bonding prestressed tendon is characterized by comprising the following steps: the epoxy resin cementing material is used for slowly bonding the intermediate layer of the prestressed tendon, and the working life is 6-12 months under the normal temperature condition; heating and curing, wherein the curing condition is that the temperature is 150-170 ℃, and the curing is carried out for 20-60 min.
Further, the use method of the epoxy resin cementing material for the slow-bonding prestressed tendon is characterized by comprising the following steps: the pot life is 6-12 months under the condition of normal temperature; heating and curing, wherein the curing condition is that the temperature is 160 ℃, and curing is carried out for 30-40 min.
The epoxy resin cementing material for the slow-bonding prestressed tendon and the use method thereof have the beneficial effects that the epoxy resin cementing material has good stability at room temperature, the pot life is 6-12 months, and the stable performance of the slow-bonding prestressed tendon from the production to the tensioning period can be ensured. By the heating method, the epoxy resin cementing material can be quickly cured, the slow-bonding prestressed steel strand can be smoothly tensioned, and the steel strand can be timely and effectively bonded with concrete according to requirements after being tensioned.
Detailed Description
Specific examples of the present invention are described in detail below.
Examples an epoxy resin cement comprising, in parts by weight, 100 parts of bisphenol a type epoxy resin (E51), 7 parts of dicyandiamide, 10 parts of dibutyl phthalate, 15 parts of phenyl glycidyl ether, 60 parts of each of cement and calcium carbonate. Adding dibutyl phthalate, phenyl glycidyl ether and dicyandiamide into bisphenol A type epoxy resin E51, uniformly stirring, adding cement and calcium carbonate powder, and uniformly stirring; and fully grinding the mixture to obtain the epoxy resin cementing material slurry. The prepared slurry is used as a cementing material of the slow-bonding prestressed tendon which needs to be cured by heating.
The mixture of the components of the epoxy resin cementing material has different densities and granularities, and the components can be fully stirred and ground to obtain the slurry with uniformly distributed components.
In the invention, dicyandiamide is a latent curing agent, and is mixed with epoxy resin (100 parts of epoxy resin and 4-12 parts of dicyandiamide) to be used as a single-component epoxy resin cementing material which is stable for a long time (more than 6 months) at room temperature. The time requirements of the slow bonding steel strand in production, transportation, storage and tensioning are met.
The epoxy resin cementing material is stable for a long time at room temperature due to the adoption of the dicyandiamide latent curing agent, and is suitable for being used at various environmental temperatures. The toughening agents and diluents improve the performance and viscosity of the cement and maintain stable performance at curing temperatures.
According to the invention, a mixture of dicyandiamide and epoxy resin (100 parts of epoxy resin and 4-12 parts of dicyandiamide) is rapidly cured (cured at 150-170 ℃ for 30-40 min) under a heating condition. The use requirements of the slowly-bonded steel strand are met, and the transition from the unbonded state to the bonded state is required as soon as possible after tensioning.
According to the invention, the epoxy resin cementing material is used as a cementing material of the slow-bonding prestressed tendon which needs to be cured by heating. And heating and curing are carried out after the steel strand is tensioned. The heating and curing can adopt a method of electrifying and heating the steel strand; or a method of winding an electric heating wire on the steel strand and electrifying and heating the electric heating wire can be adopted.
In the embodiment, the application method of the epoxy resin cementing material for the slow bonding prestressed tendon is characterized in that the epoxy resin cementing material is used for an intermediate layer (between a steel strand and a protective sleeve) of the slow bonding prestressed tendon, and the working life is 6-12 months under the normal temperature condition; heating and curing, wherein the curing condition is that the temperature is 160 ℃, and curing is carried out for 30-40 min. The heating solidification adopts a method of electrifying and heating the steel strand.
The embodiments described in this specification are only examples of implementation forms of the present invention, and the scope of protection is equivalent to the technical means that those skilled in the art can conceive of the technical features of the present invention.
Claims (6)
1. The epoxy resin cementing material for the slow-bonding prestressed tendon is characterized by comprising the following components in parts by weight: the adhesive comprises, by weight, 100 parts of bisphenol A epoxy resin, 4-12 parts of dicyandiamide, 5-15 parts of a toughening agent, 10-25 parts of a diluent and 50-200 parts of a filler; adding a toughening agent, a diluent and dicyandiamide into bisphenol A epoxy resin, uniformly stirring, adding a filler, uniformly stirring, and fully grinding the mixture to obtain a cementing material slurry; the prepared slurry is used as a cementing material of the slow-bonding prestressed tendon which needs to be cured by heating.
2. The epoxy resin binding material for the slow-bonding prestressed tendon as claimed in claim 1, wherein: 6-8 parts of dicyandiamide.
3. The epoxy resin binding material for the slow-bonding prestressed tendon as claimed in claim 1, wherein: the epoxy resin is one or two of bisphenol A epoxy resin E44 and E51.
4. The epoxy resin binding material for the slow-bonding prestressed tendon as claimed in claim 1, wherein: the filler is one or a mixture of two of cement and calcium carbonate powder.
5. The use method of the epoxy resin cementing material for the slow bonding prestressed tendon is characterized by comprising the following steps: the epoxy resin cementing material is used for slowly bonding the intermediate layer of the prestressed tendon, and the working life is 6-12 months under the normal temperature condition; heating and curing, wherein the curing condition is that the temperature is 150-170 ℃, and the curing is carried out for 20-60 min.
6. The use method of the epoxy resin binding material for the slow-bonding prestressed tendon as claimed in claim 5, characterized in that: the pot life is 6-12 months under the condition of normal temperature; heating and curing, wherein the curing condition is that the temperature is 160 ℃, and curing is carried out for 30-40 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010480541.4A CN111646734A (en) | 2020-05-30 | 2020-05-30 | Epoxy resin cementing material for slow-bonding prestressed tendon and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010480541.4A CN111646734A (en) | 2020-05-30 | 2020-05-30 | Epoxy resin cementing material for slow-bonding prestressed tendon and use method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111646734A true CN111646734A (en) | 2020-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010480541.4A Withdrawn CN111646734A (en) | 2020-05-30 | 2020-05-30 | Epoxy resin cementing material for slow-bonding prestressed tendon and use method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN111646734A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1425731A (en) * | 2002-12-19 | 2003-06-25 | 刘载鹏 | Adhesive for slowly binding prestressed rib |
| DE202007015918U1 (en) * | 2007-11-14 | 2008-03-13 | Kuse, Kolja | Stone block of layers |
| CN102295905A (en) * | 2011-07-01 | 2011-12-28 | 甘肃泰达建筑技术发展有限公司 | High performance retard-bonded material for retard-bonded prestressed reinforcing steel and preparation method thereof |
| CN102382610A (en) * | 2011-09-28 | 2012-03-21 | 天津鑫坤泰预应力专业技术有限公司 | Binding-retarding agent for prestressed steel stranded wire |
| CN104746801A (en) * | 2015-02-10 | 2015-07-01 | 山西省交通科学研究院 | Prestressed concrete and construction method thereof |
-
2020
- 2020-05-30 CN CN202010480541.4A patent/CN111646734A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1425731A (en) * | 2002-12-19 | 2003-06-25 | 刘载鹏 | Adhesive for slowly binding prestressed rib |
| DE202007015918U1 (en) * | 2007-11-14 | 2008-03-13 | Kuse, Kolja | Stone block of layers |
| CN102295905A (en) * | 2011-07-01 | 2011-12-28 | 甘肃泰达建筑技术发展有限公司 | High performance retard-bonded material for retard-bonded prestressed reinforcing steel and preparation method thereof |
| CN102382610A (en) * | 2011-09-28 | 2012-03-21 | 天津鑫坤泰预应力专业技术有限公司 | Binding-retarding agent for prestressed steel stranded wire |
| CN104746801A (en) * | 2015-02-10 | 2015-07-01 | 山西省交通科学研究院 | Prestressed concrete and construction method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 李子东等: "《实用胶粘剂原材料手册》", 31 July 1999, 国防工业出版社 * |
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Application publication date: 20200911 |
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| WW01 | Invention patent application withdrawn after publication |