CN112456854A - Sodium silicate composite self-repairing concrete structure and preparation method thereof - Google Patents
Sodium silicate composite self-repairing concrete structure and preparation method thereof Download PDFInfo
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- CN112456854A CN112456854A CN202011266507.3A CN202011266507A CN112456854A CN 112456854 A CN112456854 A CN 112456854A CN 202011266507 A CN202011266507 A CN 202011266507A CN 112456854 A CN112456854 A CN 112456854A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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Abstract
The invention discloses a sodium silicate composite self-repairing concrete structure which comprises a concrete member, wherein a sodium silicate repairing agent, a permeable crystallization material and PVA (polyvinyl alcohol) fibers are uniformly distributed in the concrete member. The invention also provides a preparation method of the sodium silicate composite self-repairing concrete structure, which is used for preparing the sodium silicate repairing agent; designing the mixing proportion of concrete, and determining the mixing amount of the sodium silicate repairing agent, the permeable crystalline material and the PVA fiber; uniformly incorporating the sodium silicate restoration agent into concrete, incorporating the permeable crystalline material and the PVA fiber cement into concrete together; 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 sodium silicate composite self-repairing concrete structure and a preparation 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. The cracks provide channels for external harmful substances to enter the concrete, so that the corrosion of internal reinforcing 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 methods for repairing concrete cracks comprise a replacement concrete method, a grouting plugging method and a surface repairing method, (Longyun, Wangyong, Cen rain bridge, Riming navigation, Li and Tao. main influencing factors of the building concrete cracks and a construction treatment technology [ J ]. the development of the building technology, 2020,47(17):52-53.), however, the methods are only suitable for large-width cracks which can be seen by naked eyes, the repairing effect on small-width cracks which are difficult to detect can not be achieved, 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 sodium silicate composite self-repairing concrete structure and a preparation method thereof, which can be used for independently detecting and repairing tiny 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 sodium silicate composite self-repairing concrete structure comprises a concrete member, wherein a sodium silicate repairing agent, a permeable crystallization material and PVA fibers are distributed 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。
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.
Further, the sodium silicate repairing agent is of a composite structure and comprises sodium silicate particles and epoxy resin, and the sodium silicate particles are wrapped in the epoxy resin.
Further, the sodium silicate repairing agent is a flaky solid.
The invention also provides a preparation method of the self-repairing concrete structure, which comprises the following steps:
preparing a sodium silicate repairing agent;
designing the mixing proportion of concrete, and determining the mixing amount of the sodium silicate repairing agent, the permeable crystalline material and the PVA fiber;
uniformly incorporating the sodium silicate restoration agent into concrete, incorporating the permeable crystalline material and the PVA fibers into concrete together with cement;
and pouring concrete on the concrete member, and curing and forming.
Furthermore, the proportion of the permeable crystalline material substituted for the cementing material is 3.0-3.5%.
Further, step 1.1: cutting the transparent adhesive tape in sections, and soaking one side of the transparent adhesive tape in epoxy resin;
step 1.2: uniformly scattering anhydrous sodium silicate on the surface of the adhesive tape, which is adhered with the epoxy resin;
step 1.3: uniformly distributing the surface of the adhesive tape which is full of sodium silicate, and soaking the surface of the adhesive tape in epoxy resin again;
step 1.4: spreading fine sand on the surface of the epoxy resin;
step 1.5: placing the adhesive tape in an oven and baking at 65-70 ℃ until the epoxy resin is in a crisp state;
step 1.6: tearing the adhesive tape, and crushing the obtained solid into a sheet-shaped object to obtain the sodium silicate repairing agent.
Further, the design of the concrete mixing proportion determines the mixing amount of the sodium silicate repairing agent, the permeable crystalline material and the PVA fiber, and specifically comprises the following steps:
when the strength grade of the concrete member is C40 and the slump constant of the concrete member is 160-200 mm, the using amount of cement is 150-160 parts, the using amount of fly ash is 65-70 parts, the using amount of fine aggregate is 200-220 parts, the using amount of coarse aggregate is 350-375 parts, the using amount of water is 92-96 parts, and the using amount of water reducing agent is 1.9-2.2 parts, the mixing amount of sodium silicate repairing agent and the proportion of cementing material is 3.6-4.1%, the proportion of penetrating crystalline material replacing the cementing material is 3.0-3.5%, and the mixing amount of PVA fiber and the volume ratio of cement is 0.10-0.12%.
Further, the cement PO 42.5 is 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 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。
Compared with the prior art, the invention has at least the following beneficial effects:
(1) after the crack is generated, the sodium silicate repairing agent can react with calcium ions in cement to generate calcium silicate, so that the crack in the concrete member is filled. 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 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 improves the mechanical property and the waterproof impermeability of the concrete structure, simultaneously endows the concrete with the capability of self-repairing damage, performs targeted and effective inhibition in the initial development stage of concrete cracks, greatly reduces the high cost generated by the later-stage repair of the cracks, and greatly improves the durability, the safety and the economy 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.
Figure 2 is a schematic diagram of a composite structure of a sodium silicate remediation agent according to an embodiment of the present invention.
The reference numbers in the figures illustrate: the concrete member comprises 1-concrete member, 2-sodium silicate repairing agent, 3-permeable crystallization material, 4-PVA fiber, 5-anhydrous sodium silicate particle and 6-epoxy resin.
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. 1-2, the sodium silicate composite self-repairing concrete structure comprises a concrete member 1, wherein a sodium silicate repairing agent 2, a permeable crystalline material 3 and a PVA fiber 4 are doped in the concrete member.
The sodium silicate repairing agent 2 is a flaky solid with a diameter of about 5-7 mm, and the sodium silicate repairing agent 2 is a composite structure, please refer to fig. 2, the sodium silicate repairing agent 2 comprises two epoxy resin layers made of epoxy resin 6 on the outer side and an anhydrous sodium silicate layer made of anhydrous sodium silicate particles 5 between the two epoxy resin layers.
The permeable crystallization material 3 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 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 present embodiment also provides a method for preparing the self-repairing concrete of embodiment 1, including the steps of:
step 1: preparing a sodium silicate repairing agent;
step 2: designing the mixing proportion of concrete, and determining the mixing amount of the sodium silicate repairing agent 2, the permeable crystalline material 3 and the PVA fiber 4;
and step 3: uniformly mixing the sodium silicate repairing agent 2 into concrete in the form of aggregate, and mixing the permeable crystalline material 3 and the PVA fibers 4 into the concrete together with cement;
and 4, step 4: and pouring concrete on the concrete member, and curing and forming.
In this embodiment, the specific steps for manufacturing the sodium silicate repairing agent are as follows:
step 1.1: cutting the transparent adhesive tape in sections, and soaking one side of the transparent adhesive tape in epoxy resin;
step 1.2: uniformly scattering anhydrous sodium silicate on the surface of the adhesive tape, which is adhered with the epoxy resin, wherein the thickness of the adhesive tape is about 1 mm;
step 1.3: uniformly distributing the surface of the adhesive tape which is full of sodium silicate, and soaking the surface of the adhesive tape in epoxy resin again;
step 1.4: spreading fine sand on the surface of the epoxy resin;
step 1.5: placing the adhesive tape in a drying oven, and drying for 8-10 hours at 65-70 ℃ until the epoxy resin is in a dry and brittle state;
step 1.6: and tearing the adhesive tape, and crushing the obtained solid into 5-7 mm sheets to obtain the sodium silicate repairing agent.
In step 2 of this embodiment, when the strength grade of the concrete member is C40 and the slump thereof 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 sodium silicate repairing agent to the cementitious material is 3.6 to 4.1%, the proportion of the permeable crystalline material to the cementitious material is 3.0 to 3.5%, and the proportion of the PVA fiber to the cement is 0.10 to 0.12%.
Specifically, in the 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 in the area 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 Ltd, and the appearance of the permeable crystallization material is grayA color powder having a density of 2000 to 2100kg/m3。
In the concrete member 1 of the above embodiment, due to the presence of the sodium silicate repair agent, when a crack is generated in the concrete member, calcium silicate is generated between the anhydrous sodium silicate wrapped by the epoxy resin and calcium ions in the member, and the crack can be effectively filled. 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 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. The utility model provides a compound self-repairing concrete structure of sodium silicate which characterized in that: the concrete member comprises a concrete member (1), wherein a sodium silicate repairing agent (2), a permeable crystalline material (3) and PVA fibers (4) are distributed in the concrete member (1).
2. The sodium silicate composite self-repairing concrete structure according to claim 1, characterized in that: the permeable crystallization material (3) is an active silicon permeable crystallization master batch, is gray powder and has the density of 2000-2100 kg/m3。
3. The sodium silicate composite self-repairing concrete structure according to claim 1, characterized in that: 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.
4. The sodium silicate composite self-repairing concrete structure according to claim 1, characterized in that: the sodium silicate repairing agent (2) is of a composite structure and comprises anhydrous sodium silicate particles (5) and epoxy resin (6), wherein the anhydrous sodium silicate particles (5) are wrapped in the epoxy resin (6).
5. The sodium silicate composite self-repairing concrete structure according to claim 1, characterized in that: the sodium silicate repairing agent (2) is a flaky solid.
6. A method of producing a self-repairing concrete structure according to any one of claims 1 to 5, characterized by comprising the steps of:
preparing a sodium silicate repairing agent (2);
designing the mixing proportion of concrete, and determining the mixing amount of the sodium silicate repairing agent (2), the permeable crystalline material (3) and the PVA fiber (4);
uniformly incorporating the sodium silicate restoration agent (2) into concrete, incorporating the permeable crystalline material (3) and the PVA fibers (4) into the concrete together with cement;
and pouring concrete on the concrete member, and curing and forming.
7. The method for producing a self-repairing concrete structure according to claim 6, wherein: the proportion of the permeable crystalline material (3) replacing cement is 3.0-3.5%.
8. The method for preparing a self-repairing concrete structure according to claim 6, wherein the step of preparing the sodium silicate repairing agent (2) comprises the following steps:
step 1.1: cutting the transparent adhesive tape in sections, and soaking one side of the transparent adhesive tape in epoxy resin;
step 1.2: uniformly scattering anhydrous sodium silicate on the surface of the adhesive tape, which is adhered with the epoxy resin;
step 1.3: uniformly distributing the surface of the adhesive tape which is full of sodium silicate, and soaking the surface of the adhesive tape in epoxy resin again;
step 1.4: spreading fine sand on the surface of the epoxy resin;
step 1.5: placing the adhesive tape in an oven and baking at 65-70 ℃ until the epoxy resin is in a crisp state;
step 1.6: tearing the adhesive tape, and crushing the obtained solid into a sheet-shaped object to obtain the sodium silicate repairing agent.
9. The method for preparing a self-repairing concrete structure according to claim 6, wherein the concrete mix proportion is designed, and the mixing amount of the sodium silicate repairing agent (2), the permeable crystalline material (3) and the PVA fiber (4) is determined, and specifically comprises the following steps:
when the strength grade of the concrete member (1) is C40 and the slump of the concrete member is 160-200 mm, the using amount of cement is 150-160 parts, the using amount of fly ash is 65-70 parts, the using amount of fine aggregate is 200-220 parts, the using amount of coarse aggregate is 350-375 parts, the using amount of water is 92-96 parts, and the using amount of water reducing agent is 1.9-2.2 parts, the mixing amount of the sodium silicate repairing agent (2) and the specific gravity of the cementing material are 3.6-4.1%, the specific gravity of the penetrating crystal material (3) replacing the cementing material is 3.0-3.5%, and the mixing amount of PVA fiber (4) and the volume ratio of cement are 0.10-0.12%.
10. The method of producing a self-repairing concrete structure as recited in claim 9, wherein said cement is PO 42.5 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116161941A (en) * | 2023-01-13 | 2023-05-26 | 中建海峡建设发展有限公司 | Self-repairing cement-based composite material and preparation method thereof |
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| JP2018203582A (en) * | 2017-06-07 | 2018-12-27 | 株式会社トクヤマ | Water-proof material |
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| JP2018203582A (en) * | 2017-06-07 | 2018-12-27 | 株式会社トクヤマ | Water-proof material |
| 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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| CN116161941A (en) * | 2023-01-13 | 2023-05-26 | 中建海峡建设发展有限公司 | Self-repairing cement-based composite material and preparation method thereof |
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