CN117700184B - Crack self-repairing early-strength concrete and preparation process thereof - Google Patents
Crack self-repairing early-strength concrete and preparation process thereof Download PDFInfo
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- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 claims description 5
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 17
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- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 2
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- 229940024546 aluminum hydroxide gel Drugs 0.000 description 2
- SMYKVLBUSSNXMV-UHFFFAOYSA-K aluminum;trihydroxide;hydrate Chemical compound O.[OH-].[OH-].[OH-].[Al+3] SMYKVLBUSSNXMV-UHFFFAOYSA-K 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
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- QDWYPRSFEZRKDK-UHFFFAOYSA-M sodium;sulfamate Chemical group [Na+].NS([O-])(=O)=O QDWYPRSFEZRKDK-UHFFFAOYSA-M 0.000 description 2
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Classifications
-
- 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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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of concrete preparation, and particularly discloses crack self-repairing early-strength concrete and a preparation process thereof. The raw materials of the concrete comprise the following components: 220-280 parts of cement, 80-110 parts of fly ash, 30-55 parts of mineral powder, 710-765 parts of fine aggregate, 1000-1250 parts of coarse aggregate, 4.5-7 parts of water reducer, 5-8 parts of urea, 0.02-0.05 part of pumpkin seed powder, 133-165 parts of tea extract and 11-14 parts of aluminum nitrate powder. Compared with the traditional modes of intrinsic self-repairing, osmotic crystallization self-repairing, microcapsule self-repairing and the like, the mode of self-repairing the concrete has the advantages of good repairing effect, strong operability, lower cost, more accordance with the development and application trend of self-repairing concrete materials and more contribution to popularization and application.
Description
Technical Field
The invention relates to the technical field of concrete preparation, in particular to crack self-repairing early-strength concrete and a preparation process thereof.
Background
Concrete is an indispensable building material in traffic engineering construction. Cracking phenomena of concrete structures due to inherent shrinkage, plastic shrinkage, temperature difference changes and the like are ubiquitous. The occurrence of cracks can reduce the impermeability of the concrete structure, quicken the corrosion of the reinforcing steel bars and influence the service life of the building. The quality and safety hazards of the building caused by concrete cracks are a long-standing problem. In order to prolong the service life of a concrete structure and reduce maintenance cost and potential safety hazards, a concrete crack self-repairing technology has been a research hot spot. At present, the self-repairing technology of concrete cracks mainly comprises intrinsic self-repairing, osmotic crystallization self-repairing, microcapsule self-repairing and the like.
The intrinsic self-repairing has the problems that the repairing capability is weak and the impermeability requirement cannot be met. The osmotic crystallization self-repairing technology needs to be carried out in a humid environment, and the time required for self-repairing is long. The microcapsule self-repairing technology is to encapsulate the repairing agent into the microcapsule in advance and mix the repairing agent and the curing agent into the concrete. When the concrete is cracked, the tip stress of the crack can cause the microcapsule to crack, the repairing agent is released and flows into the crack, and the repairing agent contacts with the curing agent, water or air and the like pre-buried in the concrete to generate curing reaction so as to repair the crack. However, the microcapsule self-repairing technology requires a complex microcapsule preparation technology, and the used high molecular resin has high price, low cost performance when being applied to concrete, and difficult popularization and application. It is therefore necessary to explore new techniques for self-repairing concrete cracks.
Disclosure of Invention
The invention discloses crack self-repairing early-strength concrete and a preparation process thereof, which have the advantages of strong operability, good repairing effect, lower cost and more contribution to popularization and application. In order to achieve the above purpose, the present invention discloses the following technical solutions.
Firstly, the invention discloses crack self-repairing early-strength concrete, which comprises the following raw materials in parts by weight: 220-280 parts of cement, 80-110 parts of fly ash, 30-55 parts of mineral powder, 710-765 parts of fine aggregate, 1000-1250 parts of coarse aggregate, 4.5-7 parts of water reducer, 5-8 parts of urea, 0.02-0.05 part of pumpkin seed powder, 133-165 parts of tea extract and 11-14 parts of aluminum nitrate powder.
Further, the tea leaching solution is prepared from tea leaves or tea stems and the like and water according to the weight ratio of 1-1.5 g: mixing at a ratio of 100ml, heating for leaching, and removing solids. Optionally, the heating temperature is 60-80 ℃, and the leaching time is 30-50 min.
Further, the water reducing agent includes any one of a polycarboxylate water reducing agent, a naphthalene water reducing agent, a sulfamate water reducing agent, and the like.
Further, the granularity of the pumpkin seed powder is 50-100 meshes. Optionally, the pumpkin seed powder is obtained by air-drying pumpkin seeds, pulverizing, and sieving.
Further, the raw material composition also comprises 10-15 parts by weight of fibers. Optionally, the fibers comprise at least one of steel fibers, organic fibers, carbon fibers and the like, and the length of the fibers is 15-30 mm. The fibers help to increase the crack resistance of the concrete structure and reduce the occurrence of cracks.
Optionally, the organic fiber includes at least one of polyethylene fiber, polypropylene fiber, polyvinyl alcohol fiber, polyacrylonitrile fiber, and the like.
Secondly, the invention discloses a preparation process of the crack self-repairing early-strength concrete, which comprises the following steps: and uniformly mixing the cement, the fly ash, the mineral powder, the fine aggregate, the coarse aggregate, the water reducer, the urea, the pumpkin seed powder and the aluminum nitrate powder, and then adding the tea leaching solution for uniform mixing.
Compared with the prior art, the crack self-repairing early-strength concrete has the following beneficial effects:
The pumpkin seed powder added into the concrete contains urease, and the cell wall of the pumpkin seed powder can be destroyed in the alkaline environment generated by hydration in the cement hydration process, so that the urease is released into the concrete, and the urease can decompose the urea into carbon dioxide and ammonia. The carbonate formed by the reaction of the carbon dioxide and the mixing water can react with calcium ions provided by the hydration reaction of cement to form metastable calcium carbonate. This is because the concrete of the present invention uses tea extract as mixing water, which contains tea polyphenol, and the benzene hydroxyl contained therein is easy to lose electrons and then generates good calcium ion chelation, which can chelate with the calcium ion, thereby inhibiting the conversion of intermediate metastable calcium carbonate into stable aragonite calcium carbonate when reacting with carbonate formed by the urea to form calcium carbonate. The metastable calcium carbonate not only can fill and compact the shrinkage cracks generated in the hydration hardening process of the concrete, but also can self-repair the cracks. And because the reactivity of the metastable calcium carbonate is high, the metastable calcium carbonate can be redissolved and recrystallized in the cement hydration stage, and cementing is carried out on the metastable calcium carbonate and a cementing substance generated by cement hydration in the process, so that the particle filling compaction mode of cracks can be converted into cementing sealing, the repairing effect on the cracks can be remarkably improved, the impermeability is further improved, the cementing effect can improve the binding force between crack interfaces, and the strength of a concrete structure is improved. In another aspect, ammonia produced by the urea decomposition reacts with the aluminum nitrate under the action of the mixing water to form aluminum hydroxide gel and ammonium nitrate. Wherein, the aluminum hydroxide gel also has the effect of filling and compacting pores and cracks in the concrete structure, thereby improving the strength and the impermeability of the concrete structure. The ammonium nitrate and the formed calcium nitrate help to promote the early hydration rate of cement, generate more gelled substances, improve the early strength of a concrete structure and reduce shrinkage and caused cracking of the concrete. Compared with the traditional modes of intrinsic self-repairing, osmotic crystallization self-repairing, microcapsule self-repairing and the like, the mode of self-repairing the concrete has the advantages of good repairing effect, strong operability, lower cost, more accordance with the development and application trend of self-repairing concrete materials and more contribution to popularization and application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and together with the description serve to explain the invention. Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is an X-ray diffraction (XRD) pattern of concrete prepared in example 1 below.
FIG. 2 is a chart showing the test of the impermeability of the test pieces prepared in examples 1 to 6 below.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The invention will now be further described with reference to the drawings and the detailed description.
Example 1
The preparation of the crack self-repairing early-strength concrete comprises the following steps:
(1) Preparation of tea leaching solution: tea leaves and clear water according to 1.2g:100ml of the mixture was stirred and heated to 70℃for 45min. And filtering to remove tea leaves after completion to obtain tea leaching liquor.
(2) Pulverizing air-dried semen Cucurbitae with pulverizer, and sieving with 100 mesh sieve to obtain semen Cucurbitae powder.
(3) Weighing the following raw materials: 42.5 parts of ordinary Portland cement 240 parts, coal ash 90 parts, mineral powder 40 parts, river sand fine aggregate 720 parts, crushed stone coarse aggregate 1100 parts, water reducer 5 parts, urea 6.2 parts, pumpkin seed powder 0.03 parts prepared in this example, tea leaching liquor 141 parts prepared in this example and aluminum nitrate powder 13 parts. Wherein: the fly ash is II-grade fly ash, and the mineral powder is S95 mineral powder. The grain size distribution of the river sand fine aggregate is between 0.2 and 0.5 mm. The particle size distribution of the broken stone coarse aggregate is 5-20 mm. The water reducer is a polycarboxylate water reducer, and the water reducing rate is 20%.
(4) The 42.5 ordinary Portland cement, the fly ash, the mineral powder, the river sand fine aggregate, the broken stone coarse aggregate, the water reducer, the urea, the pumpkin seed powder and the aluminum nitrate powder are added into a stirrer to be dry mixed for 5min, and then the tea leaching solution is added and then the rapid stirring is carried out for 3min, thus obtaining the concrete slurry.
According to the requirements of the test method standard of physical and mechanical properties of concrete (GB/T50081-2019), the concrete slurry prepared in the embodiment is prepared into a standard cube test piece with the side length of 150mm, and then the compressive strength is tested, and the XRD pattern of the test piece is shown in figure 1. In addition, the test pieces prepared from the concrete paste of this example were tested for their impermeability according to highway engineering cement and cement concrete test procedure (JTG 3420-2020) (refer to FIG. 2). The test results of the above performance indexes are shown in the following table.
| Performance index | 28D compressive Strength | Height of water seepage |
| Example 1 | 53.73 MPa | 19.3 mm |
Example 2
The preparation of the crack self-repairing early-strength concrete comprises the following steps:
(1) Preparation of tea leaching solution: tea stalks and clear water according to 1.5g:100ml of the mixture was stirred and heated to 60℃for 50min. And filtering to remove tea leaves after completion to obtain tea leaching liquor.
(2) Pulverizing air-dried semen Cucurbitae with pulverizer, and sieving with 80 mesh sieve to obtain semen Cucurbitae powder.
(3) Weighing the following raw materials: 42.5 parts of ordinary Portland cement 280 parts, fly ash 110 parts, mineral powder 30 parts, river sand fine aggregate 765 parts, crushed stone coarse aggregate 1250 parts, water reducer 7 parts, urea 8 parts, pumpkin seed powder 0.05 parts prepared in this example, tea leach liquor 165 parts prepared in this example and aluminum nitrate powder 14 parts. Wherein: the fly ash is II-grade fly ash, and the mineral powder is S95 mineral powder. The grain size distribution of the river sand fine aggregate is between 0.2 and 0.5 mm. The particle size distribution of the broken stone coarse aggregate is 5-20 mm. The water reducer is naphthalene water reducer, and the water reducing rate is 25%.
(4) The 42.5 ordinary Portland cement, the fly ash, the mineral powder, the river sand fine aggregate, the broken stone coarse aggregate, the water reducer, the urea, the pumpkin seed powder and the aluminum nitrate powder are added into a stirrer to be dry mixed for 5min, and then the tea leaching solution is added and then the rapid stirring is carried out for 3min, thus obtaining the concrete slurry.
According to the requirements of the test method standard of physical and mechanical properties of concrete (GB/T50081-2019), the concrete slurry prepared in the embodiment is prepared into a standard cube test piece with the side length of 150mm, and then the compressive strength is tested. In addition, the test pieces prepared from the concrete paste of this example were tested for their impermeability according to highway engineering cement and cement concrete test procedure (JTG 3420-2020) (refer to FIG. 2). The test results of the above performance indexes are shown in the following table.
| Performance index | 28D compressive Strength | Height of water seepage |
| Example 2 | 51.16 MPa | 20.8 mm |
Example 3
The preparation of the crack self-repairing early-strength concrete comprises the following steps:
(1) Preparation of tea leaching solution: tea leaves and clear water according to 1.4g:100ml of the mixture was stirred and heated to 75℃for 40min. And filtering to remove tea leaves after completion to obtain tea leaching liquor.
(2) Pulverizing air-dried semen Cucurbitae with pulverizer, and sieving with 50 mesh sieve to obtain semen Cucurbitae powder.
(3) Weighing the following raw materials: 42.5 ordinary Portland cement 220 weight portions, fly ash 80 weight portions, mineral powder 55 weight portions, river sand fine aggregate 710 weight portions, broken stone coarse aggregate 1000 weight portions, water reducing agent 4.5 weight portions, urea 5 weight portions, pumpkin seed powder 0.02 weight portions prepared in this example, tea leaching solution 133 weight portions prepared in this example, aluminum nitrate powder 11 weight portions, and polypropylene fiber 10 weight portions. Wherein: the fly ash is II-grade fly ash, and the mineral powder is S95 mineral powder. The grain size distribution of the river sand fine aggregate is between 0.2 and 0.5 mm. The particle size distribution of the broken stone coarse aggregate is 5-20 mm. The water reducing agent is sodium sulfamate, and the water reducing rate is 20%. The polypropylene fiber length was 30mm.
(4) The 42.5 ordinary Portland cement, the fly ash, the mineral powder, the river sand fine aggregate, the broken stone coarse aggregate, the water reducer, the urea, the pumpkin seed powder and the aluminum nitrate powder are added into a stirrer to be dry mixed for 8min, and then the tea leaching solution is added and then the mixture is rapidly stirred for 5min, so that the concrete slurry is obtained.
According to the requirements of the test method standard of physical and mechanical properties of concrete (GB/T50081-2019), the concrete slurry prepared in the embodiment is prepared into a standard cube test piece with the side length of 150mm, and then the compressive strength is tested. In addition, the test pieces prepared from the concrete paste of this example were tested for their impermeability according to highway engineering cement and cement concrete test procedure (JTG 3420-2020) (refer to FIG. 2). The test results of the above performance indexes are shown in the following table.
| Performance index | 28D compressive Strength | Height of water seepage |
| Example 3 | 58.27 MPa | 17.2 mm |
Example 4
The preparation of the crack self-repairing early-strength concrete comprises the following steps:
(1) Preparation of tea leaching solution: tea leaves and clear water are mixed according to the weight ratio of 1.0g:100ml of the mixture was stirred and heated to 80℃for 30min. And filtering to remove tea leaves after completion to obtain tea leaching liquor.
(2) Pulverizing air-dried semen Cucurbitae with pulverizer, and sieving with 60 mesh sieve to obtain semen Cucurbitae powder.
(3) Weighing the following raw materials: 42.5 parts of ordinary Portland cement 245 parts by weight, 100 parts of fly ash, 35 parts of mineral powder, 730 parts of river sand fine aggregate, 1200 parts of crushed stone coarse aggregate, 6 parts of water reducer, 6.5 parts of urea, 0.04 part of pumpkin seed powder prepared in the embodiment, 145 parts of tea leaching solution prepared in the embodiment, 12 parts of aluminum nitrate powder and 15 parts of carbon fiber. Wherein: the fly ash is II-grade fly ash, and the mineral powder is S95 mineral powder. The grain size distribution of the river sand fine aggregate is between 0.2 and 0.5 mm. The particle size distribution of the broken stone coarse aggregate is 5-20 mm. The water reducer is a polycarboxylate water reducer, and the water reducing rate is 20%. The carbon fiber length is 15mm.
(4) The 42.5 ordinary Portland cement, the fly ash, the mineral powder, the river sand fine aggregate, the broken stone coarse aggregate, the water reducer, the urea, the pumpkin seed powder and the aluminum nitrate powder are added into a stirrer to be dry mixed for 10min, and then the tea leaching solution is added and then the mixture is rapidly stirred for 5min, so that the concrete slurry is obtained.
According to the requirements of the test method standard of physical and mechanical properties of concrete (GB/T50081-2019), the concrete slurry prepared in the embodiment is prepared into a standard cube test piece with the side length of 150mm, and then the compressive strength is tested. In addition, the test pieces prepared from the concrete paste of this example were tested for their impermeability according to highway engineering cement and cement concrete test procedure (JTG 3420-2020) (refer to FIG. 2). The test results of the above performance indexes are shown in the following table.
| Performance index | 28D compressive Strength | Height of water seepage |
| Example 4 | 59.67 MPa | 15.1 mm |
Example 5
The preparation of the crack self-repairing early-strength concrete comprises the following steps:
(1) Preparation of tea leaching solution: tea leaves and clear water according to 1.2g:100ml of the mixture was stirred and heated to 70℃for 45min. And filtering to remove tea leaves after completion to obtain tea leaching liquor.
(2) Weighing the following raw materials: 42.5 parts of ordinary Portland cement 240 parts, coal ash 90 parts, mineral powder 40 parts, river sand fine aggregate 720 parts, crushed stone coarse aggregate 1100 parts, water reducer 5 parts, urea 6.2 parts, tea leaching liquor 141 parts prepared in the embodiment and aluminum nitrate 13 parts. Wherein: the fly ash is II-grade fly ash, and the mineral powder is S95 mineral powder. The grain size distribution of the river sand fine aggregate is between 0.2 and 0.5 mm. The particle size distribution of the broken stone coarse aggregate is 5-20 mm. The water reducer is a polycarboxylate water reducer, and the water reducing rate is 20%.
(3) The 42.5 ordinary Portland cement, the fly ash, the mineral powder, the river sand fine aggregate, the broken stone coarse aggregate, the water reducer, the urea and the aluminum nitrate powder are added into a stirrer to be dry mixed for 5min, and then the tea leaching solution is added and then is rapidly stirred for 3min, so that the concrete slurry is obtained.
According to the requirements of the test method standard of physical and mechanical properties of concrete (GB/T50081-2019), the concrete slurry prepared in the embodiment is prepared into a standard cube test piece with the side length of 150mm, and then the compressive strength is tested. In addition, the test pieces prepared from the concrete paste of this example were tested for their impermeability according to highway engineering cement and cement concrete test procedure (JTG 3420-2020) (refer to FIG. 2). The test results of the above performance indexes are shown in the following table.
| Performance index | 28D compressive Strength | Height of water seepage |
| Example 5 | 46.39 MPa | 30.3 mm |
Example 6
The preparation of the crack self-repairing early-strength concrete comprises the following steps:
(1) Preparation of tea leaching solution: tea stalks and clear water according to 1.5g:100ml of the mixture was stirred and heated to 60℃for 50min. And filtering to remove tea leaves after completion to obtain tea leaching liquor.
(2) Pulverizing air-dried semen Cucurbitae with pulverizer, and sieving with 80 mesh sieve to obtain semen Cucurbitae powder.
(3) Weighing the following raw materials: 42.5 parts of ordinary Portland cement 280 parts, fly ash 110 parts, mineral powder 30 parts, river sand fine aggregate 765 parts, crushed stone coarse aggregate 1250 parts, water reducer 7 parts, pumpkin seed powder 0.05 parts prepared in this example, tea leaching solution 165 parts prepared in this example and aluminum nitrate powder 14 parts. Wherein: the fly ash is II-grade fly ash, and the mineral powder is S95 mineral powder. The grain size distribution of the river sand fine aggregate is between 0.2 and 0.5 mm. The particle size distribution of the broken stone coarse aggregate is 5-20 mm. The water reducer is naphthalene water reducer, and the water reducing rate is 25%.
(4) The 42.5 ordinary Portland cement, the fly ash, the mineral powder, the river sand fine aggregate, the broken stone coarse aggregate, the water reducer, the pumpkin seed powder and the aluminum nitrate powder are added into a stirrer to be dry mixed for 5min, and then the tea leaching solution is added and then is rapidly stirred for 3min, so that the concrete slurry is obtained.
According to the requirements of the test method standard of physical and mechanical properties of concrete (GB/T50081-2019), the concrete slurry prepared in the embodiment is prepared into a standard cube test piece with the side length of 150mm, and then the compressive strength is tested. In addition, the test pieces prepared from the concrete paste of this example were tested for their impermeability according to highway engineering cement and cement concrete test procedure (JTG 3420-2020) (refer to FIG. 2). The test results of the above performance indexes are shown in the following table.
| Performance index | 28D compressive Strength | Height of water seepage |
| Example 6 | 43.52 MPa | 34.6 mm |
Example 7
The preparation of the crack self-repairing early-strength concrete comprises the following steps:
(1) Pulverizing air-dried semen Cucurbitae with pulverizer, and sieving with 80 mesh sieve to obtain semen Cucurbitae powder.
(2) Weighing the following raw materials: 42.5 parts of ordinary Portland cement 280 parts, fly ash 110 parts, mineral powder 30 parts, river sand fine aggregate 765 parts, crushed stone coarse aggregate 1250 parts, water reducer 7 parts, urea 8 parts, pumpkin seed powder 0.05 parts, clear water 165 parts and aluminum nitrate powder 14 parts. Wherein: the fly ash is II-grade fly ash, and the mineral powder is S95 mineral powder. The grain size distribution of the river sand fine aggregate is between 0.2 and 0.5 mm. The particle size distribution of the broken stone coarse aggregate is 5-20 mm. The water reducer is naphthalene water reducer, and the water reducing rate is 25%.
(3) The 42.5 ordinary Portland cement, the fly ash, the mineral powder, the river sand fine aggregate, the broken stone coarse aggregate, the water reducer, the urea, the pumpkin seed powder and the aluminum nitrate powder in the embodiment are added into a stirrer to be dry mixed for 5min, and then the clear water is added and then the concrete slurry is obtained after rapid stirring for 3 min.
According to the requirements of the test method standard of physical and mechanical properties of concrete (GB/T50081-2019), the concrete slurry prepared in the embodiment is prepared into a standard cube test piece with the side length of 150mm, and then the compressive strength is tested. In addition, the test pieces prepared from the concrete slurries of this example were tested for their impermeability according to the highway engineering cement and cement concrete test procedure (JTG 3420-2020). The test results of the above performance indexes are shown in the following table.
| Performance index | 28D compressive Strength | Height of water seepage |
| Example 7 | 47.36 MPa | 28.5 mm |
Example 8
The preparation of the crack self-repairing early-strength concrete comprises the following steps:
(1) Preparation of tea leaching solution: tea leaves and clear water according to 1.4g:100ml of the mixture was stirred and heated to 75℃for 40min. And filtering to remove tea leaves after completion to obtain tea leaching liquor.
(2) Pulverizing air-dried semen Cucurbitae with pulverizer, and sieving with 50 mesh sieve to obtain semen Cucurbitae powder.
(3) Weighing the following raw materials: 42.5 ordinary Portland cement 220 weight portions, fly ash 80 weight portions, mineral powder 55 weight portions, river sand fine aggregate 710 weight portions, broken stone coarse aggregate 1000 weight portions, water reducing agent 4.5 weight portions, urea 5 weight portions, pumpkin seed powder 0.02 weight portions prepared in this example, tea leaching solution 133 weight portions prepared in this example, and polypropylene fiber 10 weight portions. Wherein: the fly ash is II-grade fly ash, and the mineral powder is S95 mineral powder. The grain size distribution of the river sand fine aggregate is between 0.2 and 0.5 mm. The particle size distribution of the broken stone coarse aggregate is 5-20 mm. The water reducing agent is sodium sulfamate, and the water reducing rate is 20%. The polypropylene fiber length was 30mm.
(4) The 42.5 ordinary Portland cement, the fly ash, the mineral powder, the river sand fine aggregate, the broken stone coarse aggregate, the water reducer, the urea and the pumpkin seed powder in the embodiment are added into a stirrer to be dry mixed for 8min, and then the tea leaching solution is added and then is rapidly stirred for 5min, so that the concrete slurry is obtained.
According to the requirements of the test method standard of physical and mechanical properties of concrete (GB/T50081-2019), the concrete slurry prepared in the embodiment is prepared into a standard cube test piece with the side length of 150mm, and then the compressive strength is tested. In addition, the test pieces prepared from the concrete slurries of this example were tested for their impermeability according to the highway engineering cement and cement concrete test procedure (JTG 3420-2020). The test results of the above performance indexes are shown in the following table.
| Performance index | 28D compressive Strength | Height of water seepage |
| Example 8 | 54.21 MPa | 20.8 mm |
Example 9
The preparation of the crack self-repairing early-strength concrete comprises the following steps:
(1) Pulverizing air-dried semen Cucurbitae with pulverizer, and sieving with 100 mesh sieve to obtain semen Cucurbitae powder.
(2) Weighing the following raw materials: 42.5 parts of ordinary Portland cement 240 parts, coal ash 90 parts, mineral powder 40 parts, river sand fine aggregate 720 parts, broken stone coarse aggregate 1100 parts, water reducer 5 parts, urea 6.2 parts, pumpkin seed powder 0.03 parts prepared in the embodiment and clear water 141 parts. Wherein: the fly ash is II-grade fly ash, and the mineral powder is S95 mineral powder. The grain size distribution of the river sand fine aggregate is between 0.2 and 0.5 mm. The particle size distribution of the broken stone coarse aggregate is 5-20 mm. The water reducer is a polycarboxylate water reducer, and the water reducing rate is 20%.
(3) The 42.5 ordinary Portland cement, the fly ash, the mineral powder, the river sand fine aggregate, the broken stone coarse aggregate, the water reducer, the urea and the pumpkin seed powder in the embodiment are added into a stirrer to be dry mixed for 5min, and then the clear water is added and then the concrete slurry is obtained after rapid stirring for 3 min.
According to the requirements of the test method standard of physical and mechanical properties of concrete (GB/T50081-2019), the concrete slurry prepared in the embodiment is prepared into a standard cube test piece with the side length of 150mm, and then the compressive strength is tested. In addition, the test pieces prepared from the concrete slurries of this example were tested for their impermeability according to the highway engineering cement and cement concrete test procedure (JTG 3420-2020). The test results of the above performance indexes are shown in the following table.
| Performance index | 28D compressive Strength | Height of water seepage |
| Example 9 | 48.07 MPa | 27.3 mm |
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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 crack self-repairing early-strength concrete is characterized by comprising the following raw materials in parts by weight: 220-280 parts of cement, 80-110 parts of fly ash, 30-55 parts of mineral powder, 710-765 parts of fine aggregate, 1000-1250 parts of coarse aggregate, 4.5-7 parts of water reducer, 5-8 parts of urea, 0.02-0.05 part of pumpkin seed powder, 133-165 parts of tea extract and 11-14 parts of aluminum nitrate powder;
The tea leaching solution is prepared from 1-1.5 g of tea or tea stalks and water: mixing at a ratio of 100ml, heating for leaching, and removing solids.
2. The crack self-repairing early-strength concrete according to claim 1, wherein the heating temperature is 60-80 ℃ and the leaching time is 30-50 min.
3. The crack self-repairing early-strength concrete according to claim 1, wherein the water reducing agent comprises any one of a polycarboxylate water reducing agent, a naphthalene water reducing agent and a sulfamate water reducing agent.
4. The crack self-repairing early-strength concrete according to claim 1, wherein the granularity of the pumpkin seed powder is 50-100 meshes.
5. The crack self-repairing early-strength concrete according to claim 4, wherein the pumpkin seed powder is obtained by air-drying pumpkin seeds, pulverizing and sieving.
6. The crack self-repairing early-strength concrete according to claim 5, wherein the raw material composition further comprises 10-15 parts by weight of fiber.
7. The crack self-repairing early strength concrete of claim 6, wherein the fibers comprise at least one of steel fibers, organic fibers, carbon fibers.
8. The crack self-repairing early-strength concrete according to claim 7, wherein the length of the fiber is 15-30 mm.
9. The crack self-repairing early strength concrete of claim 8, wherein the organic fibers comprise at least one of polyethylene fibers, polypropylene fibers, polyvinyl alcohol fibers, and polyacrylonitrile fibers.
10. The process for preparing crack self-repairing early-strength concrete according to any one of claims 1 to 9, comprising the steps of: and uniformly mixing the cement, the fly ash, the mineral powder, the fine aggregate, the coarse aggregate, the water reducer, the urea, the pumpkin seed powder and the aluminum nitrate powder, and then adding the tea leaching solution for uniform mixing.
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