CN112456899A - Permeable crystallization composite self-repairing concrete structure and manufacturing method thereof - Google Patents
Permeable crystallization composite self-repairing concrete structure and manufacturing method thereof Download PDFInfo
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- CN112456899A CN112456899A CN202011268506.2A CN202011268506A CN112456899A CN 112456899 A CN112456899 A CN 112456899A CN 202011268506 A CN202011268506 A CN 202011268506A CN 112456899 A CN112456899 A CN 112456899A
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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
- 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
- C04B28/04—Portland cements
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Abstract
The invention discloses a permeable crystallization composite self-repairing concrete structure which comprises a concrete member, wherein a permeable crystallization material, epoxy resin and PVA (polyvinyl alcohol) fibers are doped in the concrete member. The invention also provides a manufacturing method of the permeable crystallization composite self-repairing concrete, which comprises the following steps: designing the mixing proportion of concrete, and determining the mixing amount of a permeable crystalline material, epoxy resin and PVA fiber; mixing the permeable crystalline material, the PVA fiber, cement, epoxy resin and water into concrete; and pouring concrete on the concrete member, and curing and forming. The invention can improve the mechanical property and crack resistance of the concrete structure, and enables the concrete structure to have the capability of damage self-repairing, thereby improving the safety, durability and economy of the concrete structure.
Description
Technical Field
The invention belongs to the field of self-repairing concrete and similar building materials thereof, and particularly relates to a permeable crystallization composite self-repairing concrete structure and a manufacturing method thereof.
Background
The tensile property of concrete is far less than the compressive property, and cracks are inevitably generated due to factors such as environment, temperature, fatigue damage and the like in normal service engineering. And the harmful substances outside the cracks enter the concrete to provide channels, so that the corrosion of the internal steel bars is aggravated, and the safety and the durability of the concrete are reduced. Therefore, how to effectively repair the tiny cracks in time and avoid the development and expansion of the cracks becomes a main concern.
The conventional method for repairing concrete cracks comprises the following steps: displacement concrete method, grouting plugging method and surface repairing method. (Longyun, Wangyong, Cen rain bridge, Riming navigation, Li and Tao. main influencing factors of the cracks of the building concrete and construction treatment technology [ J ] construction technology development, 2020,47(17):52-53.) however, the methods are only suitable for the cracks with larger width which can be seen by naked eyes, the repairing effect on the cracks with tiny width which are difficult to detect can not be achieved, and the repairing cost is very high, and a large amount of manpower and material resources are consumed.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a permeable crystallization composite self-repairing concrete structure and a manufacturing method thereof, which can be used for automatically detecting and repairing micro cracks in concrete so as to improve the engineering safety and the use durability of the structure.
The invention is realized by at least one of the following technical solutions.
A permeable crystallization type self-repairing concrete structure comprises a concrete member, wherein permeable crystallization materials, epoxy resin and PVA fibers are doped in the concrete member.
Further, the permeable crystallization material is an active silicon permeable crystallization master batch, is gray powder and has the density of 2000-2100 kg/m3。
Further, the epoxy resin is M01 epoxy resin, and the viscosity is 700-1100 mPas.
Furthermore, the PVA fiber is high-strength high-elasticity PVA short fiber, the tensile strength is 1600Mpa, the elastic modulus is 35Gpa, the diameter is 14 mu m, and the length is 12-15 mm.
11. The invention also provides a manufacturing method for preparing the self-repairing concrete structure, which comprises the following steps:
designing the mixing proportion of concrete, and determining the mixing amount of a permeable crystalline material, epoxy resin and PVA fiber;
mixing the permeable crystalline material, the PVA fiber, cement, epoxy resin and water into concrete;
and pouring concrete on the concrete member, and curing and forming.
Furthermore, the proportion of the permeable crystalline material replacing cement is 3.80-4.10%.
Furthermore, the mass ratio of the epoxy resin mixing amount to the cement is 2.0-3.0%.
Further, the volume ratio of the PVA fiber mixing amount to the cement is 0.10-0.12%.
Further, in the concrete mixing proportion design, the mixing amount of the permeable crystalline material, the epoxy resin and the PVA fiber is determined, when the strength grade of the concrete member is C40 and the slump of the concrete member is 160-200 mm, the using amount of the cement is 150-160 parts, the using amount of the fly ash is 65-70 parts, the using amount of the fine aggregate is 200-220 parts, the using amount of the coarse aggregate is 350-375 parts, the using amount of the water is 92-96 parts, and the using amount of the water reducing agent is 1.9-2.2 parts, the proportion of the permeable crystalline material replacing the cement is 3.80-4.10%, the mass ratio of the epoxy resin mixing amount to the cement is 2.0-3.0%, and the volume ratio of the PVA fiber mixing amount to the cement is 0.10-0.12%.
Further, the cement is PO 42.5 ordinary portland cement, the fly ash is class II power plant fly ash meeting the international GB/T1506-2005 standard, the fine aggregate is natural river sand of medium sand in a class II area, the coarse aggregate is 5-16 mm continuous graded limestone broken stone, and the water reducing agent is a polycarboxylic acid water reducing agent with the water reducing rate of 30% and the solid content of 40%.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) the permeable crystallization material is a novel active material, wherein chemical active substances can permeate into each part of the concrete along with water to catalyze hydration of unhydrated cement, so that water-insoluble solid substances are generated to fill up tiny cracks in a concrete block. The unhardened epoxy resin can be subjected to cross-linking and hardening under the destruction of calcium hydroxide, so that tiny cracks are filled and tightened. The fiber can improve the performance of concrete, and has obvious effects on improving the working performance of concrete, improving the mechanical property and improving the early cracking resistance.
(2) The invention can improve the mechanical property and the waterproof impermeability of the concrete structure, has the function of automatically detecting and repairing cracks, greatly saves the maintenance cost caused by the cracks generated in the concrete, and effectively improves the safety, the durability and the economical efficiency of the concrete structure.
Drawings
Fig. 1 is a schematic view of the construction of a self-repairing concrete structure according to an embodiment of the present invention.
The reference numbers in the figures illustrate: 1-concrete member, 2-permeable crystalline material, 3-epoxy resin and 4-PVA fiber.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
Example one
As shown in fig. 1, a self-repairing concrete structure of a permeable crystallization type includes a concrete member 1 into which a permeable crystallization material 2, an epoxy resin 3 and PVA fibers 4 are incorporated.
The permeable crystallization material 2 of the embodiment adopts an active silicon permeable crystallization master batch produced by Guangzhou Kedun waterproof material Co Ltd, the appearance is gray powder, and the density is 2000-2100 kg/m3。
The epoxy resin 3 of this example was M01 epoxy resin manufactured by kunshan jiemei electronics ltd, and had a viscosity of 700-.
The PVA fiber 4 of the embodiment is high-strength high-elasticity PVA short fiber produced by Yitian company of Changzhou, the tensile strength is 1600Mpa, the elastic modulus is 35Gpa, the diameter is 14 mu m, and the length is 12-15 mm.
Example two
Basically the same as the first embodiment, except that: the invention also provides a method for manufacturing the self-repairing concrete structure provided by the embodiment.
A method for manufacturing a self-repairing concrete structure comprises the following steps:
step 1: designing the mixing proportion of concrete, and determining the mixing amounts of the permeable crystalline material 2, the epoxy resin 3 and the PVA fiber 4;
step 2: the permeable crystallization material 2, the PVA fiber 4, cement, epoxy resin and water are mixed into concrete;
and step 3: and pouring concrete on the concrete member, and curing and forming.
In step 1 of this embodiment, when the strength grade of the concrete member is C40 and the slump constant of the concrete member is 160 to 200mm, the amount of cement is 150 to 160 parts, the amount of fly ash is 65 to 70 parts, the amount of fine aggregate is 200 to 220 parts, the amount of coarse aggregate is 350 to 375 parts, the amount of water is 92 to 96 parts, and the amount of water reducer is 1.9 to 2.2 parts, the proportion of the permeable crystalline material substituted for cement is 3.80 to 4.10%, the mass ratio of the epoxy resin doping amount to the cement is 2.0 to 3.0%, and the volume ratio of the PVA fiber doping amount to the cement is 0.10 to 0.12%.
Specifically, in this embodiment, the cement is stone-well PO 42.5 ordinary portland cement; the fly ash is class II power plant fly ash which meets the international GB/T1506-2005 standard; the fine aggregate is natural river sand and medium sand in a zone II; the coarse aggregate is limestone crushed stone with 5-16 mm continuous gradation; the water reducing rate of the water reducing agent is 30%, and the solid content of the water reducing agent is 40%; the permeable crystallization material is an active silicon permeable crystallization master batch produced by Guangzhou Kedun waterproof material Co, the appearance of the permeable crystallization master batch is gray powder, and the density of the permeable crystallization master batch is 2000-2100 kg/m3。
The concrete member 1 of the above embodiment is doped with the permeable crystalline material, and the chemical active substance in the permeable crystalline material catalyzes the hydration of unhydrated cement along with the water to each part of the concrete, so that a water-insoluble solid substance is generated, and the tiny cracks of the concrete are filled. The epoxy resin without the hardener can be mutually cross-linked and hardened under the catalysis of calcium hydroxide, so that the micro cracks are tightened and filled. The fiber can improve the performance of concrete, and has obvious effects on improving the working performance of concrete, improving the mechanical property and improving the early cracking resistance. The invention can improve the mechanical property and crack resistance of the concrete structure, and enables the concrete structure to have the capability of damage self-repairing, thereby improving the safety, durability and economy of the concrete structure.
It should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the present invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An infiltration crystallization type self-repairing concrete structure, comprising a concrete member (1), characterized in that: the concrete member (1) is doped with a permeable crystalline material (2), an epoxy resin (3) and PVA fibers.
2. A percolated crystalline self-repairing concrete structure according to claim 1, wherein: the permeable crystallization material (2) is an active silicon permeable crystallization master batch, is gray powder and has the density of 2000-2100 kg/m3。
3. A percolated crystalline self-repairing concrete structure according to claim 1, wherein: the epoxy resin (3) is M01 epoxy resin and has the viscosity of 700-1100 mPas.
4. A percolated crystalline self-repairing concrete structure according to claim 1, wherein: the PVA fiber (4) is high-strength high-elasticity PVA short fiber, the tensile strength is 1600MPa, the elastic modulus is 35GPa, the diameter is 14 mu m, and the length is 12-15 mm.
5. A method of fabricating a self-repairing concrete structure according to any one of claims 1 to 4, comprising the steps of:
designing the mixing proportion of concrete, and determining the mixing amount of the permeable crystalline material (2), the epoxy resin (3) and the PVA fiber (4);
mixing the permeable crystallization material (2), the PVA fiber (4), cement and epoxy resin with water into concrete;
and pouring concrete on the concrete member, and curing and forming.
6. The method of claim 5, wherein the method comprises the steps of: the mass ratio of the doping amount of the permeable crystalline material (2) to the cement is 3.80-4.10%.
7. The method of claim 5, wherein the method comprises the steps of: the mass ratio of the mixing amount of the epoxy resin (3) to the cement is 2.0-3.0%.
8. The method of claim 5, wherein the method comprises the steps of: the volume ratio of the PVA fiber (4) to the cement is 0.10-0.12%.
9. The method for manufacturing a self-repairing concrete structure according to claim 5, wherein in the designing of the concrete mixing ratio, the mixing amount of the permeable crystalline material (2), the epoxy resin (3) and the PVA fiber (4) is determined, when the strength grade of the concrete member (1) is C40 and the slump thereof is 160-200 mm, the cement amount is 150-160 parts, the fly ash amount is 65-70 parts, the fine aggregate amount is 200-220 parts, the coarse aggregate amount is 350-375 parts, the water amount is 92-96 parts, and the water reducing agent amount is 1.9-2.2 parts, the proportion of the permeable crystalline material (2) substituted cement is 3.80-4.10%, the ratio of the epoxy resin (3) mixing amount to the cement mass is 2.0-3.0%, and the ratio of the PVA fiber (4) amount to the cement volume is 0.10-0.12%.
10. According to claim 9The manufacturing method is characterized in that the cement is PO 42.5 ordinary portland cement; the fly ash is class II power plant fly ash; the fine aggregate is natural river sand of sand in the area II; the coarse aggregate is limestone crushed stone with 5-16 mm continuous gradation; the water reducing agent is a polycarboxylic acid water reducing agent with the water reducing rate of 30% and the solid content of 40%; the appearance of the permeable crystallization material is gray powder, and the density of the permeable crystallization material is 2000-2100 kg/m3。
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| CN202011268506.2A CN112456899A (en) | 2020-11-13 | 2020-11-13 | Permeable crystallization composite self-repairing concrete structure and manufacturing method thereof |
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| CN202011268506.2A CN112456899A (en) | 2020-11-13 | 2020-11-13 | Permeable crystallization composite self-repairing concrete structure and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114620980A (en) * | 2022-02-11 | 2022-06-14 | 中国电建集团西北勘测设计研究院有限公司 | Hydraulic self-healing mortar and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108751869A (en) * | 2018-07-24 | 2018-11-06 | 华南理工大学 | A kind of permeable crystallization type self-repair concrete structure and preparation method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108751869A (en) * | 2018-07-24 | 2018-11-06 | 华南理工大学 | A kind of permeable crystallization type self-repair concrete structure and preparation method thereof |
Non-Patent Citations (5)
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| 张鑫: "《土木工程检测鉴定与加固改造》", 30 September 2018, 中国建材工业出版社 * |
| 李广宇: "《胶黏剂原材料手册》", 31 August 2004, 国防工业出版社 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114620980A (en) * | 2022-02-11 | 2022-06-14 | 中国电建集团西北勘测设计研究院有限公司 | Hydraulic self-healing mortar and preparation method thereof |
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