CN115636619A - Composite material for tunnel concrete - Google Patents
Composite material for tunnel concrete Download PDFInfo
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- CN115636619A CN115636619A CN202211647191.1A CN202211647191A CN115636619A CN 115636619 A CN115636619 A CN 115636619A CN 202211647191 A CN202211647191 A CN 202211647191A CN 115636619 A CN115636619 A CN 115636619A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
Disclosed is a composite material for tunnel concrete, wherein the composite material is obtained by polymerization reaction of a silane-modified nanomaterial composition with acrylic acid in the presence of an initiator; the weight ratio of the silane modified nano material composition to acrylic acid is (3-5): 2. compared with the prior art, the composite material for tunnel concrete has better flexural strength and compressive strength.
Description
Technical Field
The invention belongs to the technical field of concrete; relates to a composite material for tunnel concrete.
Background
Concrete materials are the most widely used engineering materials in the world. Concrete is the most complex composite material manufactured by a simple process and has characteristics of multiple phases, multiple scales, non-homogeneity, time-varying and the like. The thermodynamic metastable state affects the volume stability, and concrete is easy to break or destroy homophase continuity or heterogeneous bonding under the action of self deformation, shrinkage and load. In addition, concrete is typically a brittle material with low tensile strength, poor deformability and susceptibility to cracking. The existence of cracks can weaken the integrity and the bearing capacity of a structure, influence the safety, the applicability and the durability, cause potential safety hazards and become a common quality problem in engineering. Particularly, with the increase in size and complexity of infrastructure, the extreme end of service environment, the coupling of multiple factors, and the increasing expansion of application fields, these problems become more and more acute and face many new challenges.
High-performance and multifunctional concrete becomes an effective way for promoting the sustainable development of concrete and the structure thereof. The high-performance multifunctional concrete not only has excellent processing, mechanical and durable performances required by structural materials, but also has the multifunctional characteristics of self-perception, self-repairing, self-adjustment and the like. The safety, comfort and durability of the civil engineering structure can be effectively improved by utilizing the high-performance multifunctional concrete, and the harmony between the civil engineering structure and the environment is kept.
After the tunnel in China is put into normal operation, more than half of projects are troubled by various diseases, including phenomena of cracking of a lining, tunnel leakage and the like, and the normal use efficiency of the tunnel is seriously influenced by the diseases. The performance of tunnel concrete is a key factor affecting the above-mentioned problems. Research finds that the mechanical property of the tunnel concrete can be improved by optimizing the mix proportion design of the concrete, reasonably adding an additive, adopting measures such as internal curing, improving gradation and the like; the mechanical property of the tunnel concrete can be effectively improved by reasonably using the mixed admixture of fly ash, mineral powder and mineral admixture to replace part of cement.
Chinese patent application CN102381851A discloses a special admixture for tunnel concrete, which comprises the following components in parts by weight: 90-95 parts of superfine slag powder and 5-10 parts of water reducing agent. The admixture composed of the superfine slag powder and the water reducing agent can improve the early strength of the concrete and the durability of the concrete. High activity and durability and can obviously improve the impermeability and frost resistance of concrete.
Chinese patent application CN104628335A discloses a method for preparing nano-silica high-performance concrete, which comprises the following concrete components in percentage by mass: cement: water: sand: breaking stone: water reducing agent: nanosilica =1: 1.53:2.60:0.02:0.015; dissolving nano-silica in water and stirring for 20-40 seconds to form a nano-solution, and uniformly stirring the cement weighed in the step (1) and a mixed solution formed by the water reducing agent, tributyl phosphate, sodium citrate and the nano-silica in the step (2) until uniform cement paste is formed and no obvious cement clusters exist; adding sand and cement slurry, stirring for 30-60 seconds to form cement mortar, and then adding broken stone and cement to form the nano-silica high-performance concrete. The construction is convenient, the dispersibility is good, the concrete fluidity is good, and a technical approach capable of realizing large-scale production is provided for the nano-silica high-performance concrete.
However, the concrete materials of the prior art still have the defect that the mechanical properties are unsatisfactory.
Disclosure of Invention
The invention aims to provide a composite material for tunnel concrete, which has better breaking strength and compressive strength.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a composite material for tunnel concrete is prepared from silane modified nano material composition and acrylic acid through polymerizing reaction in the presence of trigger.
The composite material provided by the invention is characterized in that the weight ratio of the silane modified nano material composition to acrylic acid is (3-5): 2.
the composite material of the invention, wherein the polymerization reaction conditions are as follows: 60-80 ℃ for 12-48h.
The composite material according to the invention, wherein the silane-modified nanomaterial composition is prepared from a mixture of the following components in a weight ratio of 1: and (3) carrying out modification reaction on the nanomaterial composition of (3-5) and a silane coupling agent KH-570.
The composite material of the invention, wherein the modification reaction conditions are as follows: 40-60 ℃ for 2-12h.
The composite material comprises the following components in percentage by weight (4-6): 1 and nano metakaolin.
The composite material of the invention is characterized in that the average particle size of the nano silicon dioxide is 10-50nm.
The composite material of the invention is characterized in that the average lamella diameter of the nano metakaolin is 400nm, the average lamella thickness is 35nm, and the specific surface area is 30m 2 A density of 0.6g/cm 3 。
The composite material of the invention is characterized in that the nanomaterial composition is activated by 10-30wt% hydrochloric acid.
The composite material of the invention is characterized in that the concrete has the following basic formula:
400-480 parts of P.O 42.5 cement;
150-200 parts of water;
500-630 parts of river sand;
1000-1450 parts of sandstone;
3.20 to 4.00 weight portions of polycarboxylic acid type water reducing agent.
Compared with the prior art, the composite material for tunnel concrete has better flexural strength and compressive strength.
Detailed Description
It must be noted that, as used in this specification and the appended claims, the singular forms "a," "an," and "the" include both one and more than one (i.e., two, including two) unless the context clearly dictates otherwise.
Unless otherwise indicated, the numerical ranges in this disclosure are approximate and thus may include values outside of the stated ranges. The numerical ranges may be stated herein as from "about" one particular value, and/or to "about" another particular value. When such a range is expressed, another aspect includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent "about," it will be understood that the particular value forms another aspect. It will be further understood that the endpoints of each of the numerical ranges are significant both in relation to the other endpoint, and independently of the other endpoint.
Reference in the specification and concluding claims to parts by weight of a particular element or component in a composition or article refers to the weight relationship between that element or component and any other elements or components in the composition or article, expressed as parts by weight.
In the present invention, unless specifically indicated to the contrary, or implied from the context or customary practice in the art, all solutions referred to herein are aqueous solutions; when the solute of the aqueous solution is a liquid, all fractions and percentages are by volume and the volume percentages of a component are based on the total volume of the composition or product in which it is contained; when the solute of the aqueous solution is a solid, all fractions and percentages are by weight, and the weight percentages of a component are based on the total weight of the composition or product in which the component is included.
References to "comprising," "including," "having," and similar terms in this specification are not intended to exclude the presence of any optional components, steps or procedures, whether or not any optional components, steps or procedures are specifically disclosed. In order to avoid any doubt, all methods claimed through use of the term "comprising" may include one or more additional steps, apparatus parts or components and/or materials unless stated to the contrary. In contrast, the term "consisting of … …" excludes any component, step or procedure not specifically recited or recited. Unless otherwise specified, the term "or" refers to the listed members individually as well as in any combination.
Furthermore, the contents of any referenced patent or non-patent document in this application are incorporated by reference in their entirety, especially with respect to definitions disclosed in the art (without being inconsistent with any definitions specifically provided by the present application) and general knowledge.
In the present invention, parts are parts by weight unless otherwise indicated, temperatures are indicated in ° c or at ambient temperature, and pressures are at or near atmospheric. The room temperature means 20 to 30 ℃. There are many variations and combinations of reaction conditions (e.g., component concentrations, desired solvents, solvent mixtures, temperatures, pressures, and other reaction ranges) and conditions that can be used to optimize the purity and yield of the product obtained by the process. Only reasonable routine experimentation will be required to optimize such process conditions.
In the present invention, the nano metakaolin has an average lamella diameter of 400nm, an average lamella thickness of 35nm, and a specific surface area of 30m 2 G, density 0.6g/cm 3 。
Example 1
Mixing the following components in percentage by weight of 5:1 (average particle size of 20 nm) and nano metakaolin were put in a hydrochloric acid solution having a weight concentration of 20wt% and refluxed at 90 c for 2 hours. Cooling, centrifuging, washing with water to neutrality, and vacuum drying for 24 hr to obtain the activated nanometer material composition.
2 parts by weight of the nanomaterial composition and 8 parts by weight of the silane coupling agent KH-570 were added to anhydrous toluene, and reacted at 50 ℃ for 6 hours under a nitrogen atmosphere. Cooling, centrifuging, washing with anhydrous toluene and anhydrous ethanol for 2 times respectively, and vacuum drying for 24h to obtain the silane-modified nano material composition.
Adding 2 parts by weight of silane modified nano material composition into distilled water, performing ultrasonic treatment to uniformly disperse the silane modified nano material composition, heating the mixture to 70 ℃ in a nitrogen atmosphere, respectively adding 1 part by weight of acrylic acid and 0.1 part by weight of ammonium persulfate, and reacting for 24 hours under the condition of heat preservation. And cooling, centrifuging, washing with water to neutrality, and drying in vacuum for 24h to obtain the polyacrylic acid modified nano composite material.
IR spectrum showed that the polyacrylic acid-modified nanocomposite was at 3410cm -1 、2920cm -1 、1732cm -1 、1654cm -1 、1075cm -1 、953cm -1 And 796cm -1 Characteristic absorption peaks appear at the same positions.
Comparative example 1
Mixing the following components in percentage by weight of 5:1 (average particle size of 20 nm) and nano metakaolin were put in a hydrochloric acid solution having a weight concentration of 20wt% and refluxed at 90 c for 2 hours. Cooling, centrifuging, washing with water to neutrality, and vacuum drying for 24 hr to obtain the activated nanometer material composition.
Comparative example 2
Mixing the following components in percentage by weight of 5:1 (average particle size of 20 nm) and nano metakaolin were put in a hydrochloric acid solution having a weight concentration of 20wt% and refluxed at 90 c for 2 hours. Cooling, centrifuging, washing with water to neutrality, and vacuum drying for 24 hr to obtain the activated nanometer material composition.
2 parts by weight of the nanomaterial composition and 8 parts by weight of the silane coupling agent KH-570 were added to anhydrous toluene, and reacted at 50 ℃ for 6 hours under a nitrogen atmosphere. Cooling, centrifuging, washing with anhydrous toluene and anhydrous ethanol for 2 times respectively, and vacuum drying for 24h to obtain the silane-modified nano material composition.
Performance testing
The concrete base formulation is given in table 1 in g.
The river sand and the sandstone are firstly poured into a stirrer to be stirred for 90s, then the P.O 42.5 cement and the water reducing agent are added to be stirred for 120s, the nano composite material of the embodiment or the nano material composition of the comparative example is dispersed in water by utilizing ultrasonic waves, and then the mixture is poured into the stirrer to be stirred for 90s. And (5) removing the mold after the test piece is molded for 24 hours, immediately placing the test piece into a standard curing box for curing for 28 days, and finally taking out the test piece for testing.
The mechanical property test method is carried out according to GB/T50081-2019 'test method standard for physical and mechanical properties of concrete', wherein a cubic test piece with the size of 100mm multiplied by 100mm is adopted in a compression strength test, and a prism test piece with the size of 100mm multiplied by 400mm is adopted in a rupture strength test.
See table 2 for results.
As can be seen from Table 2, the flexural strength and compressive strength of the polyacrylic acid-modified nanocomposite material of example 1 of the present application were better than those of comparative examples 1-2.
Furthermore, it should be understood that various changes, substitutions, deletions, modifications or adjustments may be made by those skilled in the art after reading the disclosure of the present invention, and such equivalents are also within the scope of the invention as defined in the appended claims.
Claims (10)
1. The composite material for tunnel concrete is characterized by being obtained by polymerization reaction of silane modified nano material composition and acrylic acid in the presence of an initiator.
2. The composite material of claim 1, wherein the weight ratio of the silane-modified nanomaterial composition to acrylic acid is (3-5): 2.
3. the composite material according to claim 1 or 2, characterized in that the polymerization conditions are: 60-80 ℃ for 12-48h.
4. The composite material according to claim 1 or 2, characterized in that the silane-modified nanomaterial composition is prepared from a mixture of silane-modified nanomaterial composition in a weight ratio of 1: and (3) carrying out modification reaction on the nanomaterial composition of (3-5) and a silane coupling agent KH-570.
5. The composite material according to claim 4, wherein the modification reaction conditions are: 40-60 ℃ for 2-12h.
6. Composite according to claim 1 or 2, characterized in that the nanomaterial composition is in the weight ratio (4-6): 1 and nano metakaolin.
7. Composite material according to claim 6, characterized in that the nanosilica has an average particle size of 10-50nm.
8. The composite according to claim 6, characterized in that the nano metakaolin has an average platelet diameter of 400nm, an average platelet thickness of 35nm and a specific surface area of 30m 2 A density of 0.6g/cm 3 。
9. The composite material of claim 6, wherein the nanomaterial composition is activated by 10-30wt% hydrochloric acid.
10. Composite according to claim 1 or 2, characterized in that the concrete has a basic formulation:
400-480 parts of P.O 42.5 cement;
150-200 parts of water;
500-630 parts of river sand;
1000-1450 parts of sandstone;
3.20 to 4.00 weight portions of polycarboxylic acid type water reducing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211647191.1A CN115636619B (en) | 2022-12-21 | 2022-12-21 | Composite material for tunnel concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211647191.1A CN115636619B (en) | 2022-12-21 | 2022-12-21 | Composite material for tunnel concrete |
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| CN115636619A true CN115636619A (en) | 2023-01-24 |
| CN115636619B CN115636619B (en) | 2023-04-11 |
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| CN202211647191.1A Active CN115636619B (en) | 2022-12-21 | 2022-12-21 | Composite material for tunnel concrete |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04164847A (en) * | 1990-10-30 | 1992-06-10 | Denki Kagaku Kogyo Kk | Cement admixture and cement composition |
| KR20140141995A (en) * | 2013-06-03 | 2014-12-11 | 한국건설기술연구원 | Cementless concrete composition with lightweight aggregate using coal ash |
| CN109987875A (en) * | 2019-04-09 | 2019-07-09 | 北京瑞骞科技有限公司 | The preparation method and application of curing agent in a kind of high performance concrete |
| CN110482883A (en) * | 2019-09-18 | 2019-11-22 | 程菲 | A kind of dedicated blended cement of extemporaneous preparation concrete and preparation method and application |
| WO2020001169A1 (en) * | 2018-06-26 | 2020-01-02 | 科之杰新材料集团有限公司 | Preparation method for retarding ether type polycarboxylic acid water reducing agent |
| CN112979248A (en) * | 2021-03-30 | 2021-06-18 | 佛山市交通科技有限公司 | Sandstone crushed stone C60 low-creep concrete for bridge engineering |
| CN114085052A (en) * | 2021-12-22 | 2022-02-25 | 中建商品混凝土有限公司 | Super-hydrophobic concrete based on high-stone-powder-content machine-made sand and preparation method thereof |
-
2022
- 2022-12-21 CN CN202211647191.1A patent/CN115636619B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04164847A (en) * | 1990-10-30 | 1992-06-10 | Denki Kagaku Kogyo Kk | Cement admixture and cement composition |
| KR20140141995A (en) * | 2013-06-03 | 2014-12-11 | 한국건설기술연구원 | Cementless concrete composition with lightweight aggregate using coal ash |
| WO2020001169A1 (en) * | 2018-06-26 | 2020-01-02 | 科之杰新材料集团有限公司 | Preparation method for retarding ether type polycarboxylic acid water reducing agent |
| CN109987875A (en) * | 2019-04-09 | 2019-07-09 | 北京瑞骞科技有限公司 | The preparation method and application of curing agent in a kind of high performance concrete |
| CN110482883A (en) * | 2019-09-18 | 2019-11-22 | 程菲 | A kind of dedicated blended cement of extemporaneous preparation concrete and preparation method and application |
| CN112979248A (en) * | 2021-03-30 | 2021-06-18 | 佛山市交通科技有限公司 | Sandstone crushed stone C60 low-creep concrete for bridge engineering |
| CN114085052A (en) * | 2021-12-22 | 2022-02-25 | 中建商品混凝土有限公司 | Super-hydrophobic concrete based on high-stone-powder-content machine-made sand and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 张能武等, 中国建材工业出版社 * |
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