A permeability resistant concrete and a method of making the same
By treating carbon fiber and calcined dolomite with composite materials, their dispersion and interfacial bonding in the asphalt system are optimized, solving the problem of insufficient concrete impermeability in existing technologies and achieving higher impermeability and structural stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BAODING DONGHAN COMMERCIAL CONCRETE CO LTD
- Filing Date
- 2026-04-07
- Publication Date
- 2026-05-29
AI Technical Summary
In existing technologies, carbon fiber and polypropylene fiber have poor dispersion, interfacial bonding performance, and long-term stability in asphalt-based concrete systems, resulting in insufficient impermeability of the concrete.
Impermeable concrete was prepared by using composite materials, including carbon fiber, calcined dolomite, and acrylate-styrene-acrylonitrile copolymer, and by treating them with silane coupling agents to optimize their uniformity and interfacial bonding in the asphalt system.
It improves the impermeability and structural stability of concrete, enhances the density of concrete, and effectively inhibits crack propagation.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of concrete technology, specifically to an impermeable concrete and its preparation method. Background Technology
[0002] Concrete, as a widely used structural material in construction engineering, directly affects the durability, safety, and service life of buildings due to its impermeability. In practical engineering, concrete structures often suffer from durability problems such as steel corrosion, freeze-thaw damage, and chemical erosion due to water seepage, seriously affecting project quality and safety. Therefore, developing concrete materials with excellent impermeability is of great significance.
[0003] Currently, common methods for improving the impermeability of concrete include optimizing aggregate gradation, adding mineral admixtures, using waterproofing agents, and adding fiber materials. Among these, fiber-reinforced concrete has become a research hotspot due to its ability to effectively inhibit crack propagation and improve the internal density of the material. Existing technologies often use carbon fiber and polypropylene fiber as reinforcing materials, but their dispersibility, interfacial bonding performance, and long-term stability in asphalt-based concrete systems still need improvement.
[0004] Therefore, there is an urgent need to develop a dense, impermeable concrete to meet the high durability requirements of engineering structures under complex working conditions. Summary of the Invention
[0005] This invention proposes an impermeable concrete and its preparation method, which solves the problem of poor impermeability of concrete in related technologies.
[0006] The technical solution of the present invention is as follows: This invention proposes a seepage-resistant concrete, comprising the following components in parts by weight: 50 parts asphalt, 30-40 parts cement, 100-120 parts coarse aggregate, 40-50 parts fine aggregate, 15-25 parts fine mineral powder, 2-4 parts cellulose fiber, and 5-10 parts composite material; The raw materials for the composite material include the following components in parts by weight: 17-19 parts carbon fiber, 1-3 parts calcined dolomite, and 1-7 parts acrylate-styrene-acrylonitrile copolymer.
[0007] As a further technical solution, the weight ratio of the carbon fiber and calcined dolomite to the acrylate-styrene-acrylonitrile copolymer is 20:3~5.
[0008] In this invention, by optimizing the content ratio of carbon fiber, calcined dolomite, and acrylate-styrene-acrylonitrile copolymer in the raw materials of the composite material, the impermeability of concrete can be further improved when the weight ratio of carbon fiber and calcined dolomite to acrylate-styrene-acrylonitrile copolymer is 20:3~5.
[0009] As a further technical solution, the average particle size of the calcined dolomite is 50~200μm.
[0010] As a further technical solution, the method for preparing the composite material includes the following steps: The carbon fiber and the calcined dolomite were mixed and then added to a silane coupling agent solution, blended, and dried to obtain mixture I; mixture I was then blended with the acrylate-styrene-acrylonitrile copolymer, melted, and dried to obtain a composite material.
[0011] In this invention, carbon fibers and calcined dolomite are first pretreated with a silane coupling agent to better bond with the acrylate-styrene-acrylonitrile copolymer, thereby improving the success rate of composite material preparation. The silane coupling agent solution is prepared by dissolving the silane coupling agent in an ethanol solution. The silane coupling agent can be any conventional silane coupling agent in the art, such as γ-aminopropyltrimethoxysilane, vinyltriethoxysilane, or γ-glycidoxypropyltrimethoxysilane, preferably γ-glycidoxypropyltrimethoxysilane.
[0012] As a further technical solution, the amount of the silane coupling agent added is 10% to 12% of the total weight of the carbon fiber and the calcined dolomite, preferably 10%.
[0013] As a further technical solution, the carbon fiber includes a first carbon fiber and a second carbon fiber; The average aspect ratio of the first carbon fiber is 43:1; the average aspect ratio of the second carbon fiber is 2 to 8:1.
[0014] In this invention, the carbon fiber includes two types with average aspect ratios of 43:1 and 2-8:1. The carbon fiber with an average aspect ratio of 43:1 has relatively high tensile strength, effectively inhibiting crack propagation. Meanwhile, the carbon fiber with an average aspect ratio of 2-8:1 can fill the gaps between the larger aspect ratio carbon fibers and around the micropores inside the concrete, better reducing local stress concentration. The combined use of these two types of carbon fibers with average aspect ratios of 43:1 and 2-8:1 further improves the structural stability of the concrete and enhances its crack resistance under external forces. When the carbon fiber includes both types with average aspect ratios of 43:1 and 2-8:1, the aspect ratios are more matched, resulting in a superior effect on improving the crack resistance of the concrete.
[0015] As a further technical solution, the weight ratio of the first carbon fiber to the second carbon fiber is 1~3:1.
[0016] In this invention, by adjusting the content ratio of the first carbon fiber and the second carbon fiber, when the weight ratio of the first carbon fiber and the second carbon fiber is 1~3:1, the crack resistance of concrete can be further improved.
[0017] As a further technical solution, the coarse aggregate includes first crushed stone and second crushed stone with a weight ratio of 1~2:1; The first crushed stone has a particle size of 8-12 mm, and the second crushed stone has a particle size of 20-25 mm.
[0018] As a further technical solution, the fine aggregate is medium sand; The medium sand includes one or both of quartz sand and basalt sand.
[0019] As a further technical solution, the mineral fine powder includes at least two of fly ash, slag powder, and microsilica.
[0020] As a further technical solution, when the mineral powder is fly ash and microsilica, the weight ratio of the fly ash and microsilica is 3:2.
[0021] This invention proposes a method for preparing impermeable concrete, comprising the following steps: S1. The cement, coarse aggregate, fine aggregate, and mineral powder are mixed in proportion to weight to obtain mixture II; S2. The asphalt, cellulose fiber, composite material and mixture II are blended together and cooled to obtain the impermeable concrete.
[0022] As a further technical solution, in step S2, the blending temperature is 160~170℃ and the time is 1~1.5h.
[0023] The working principle and beneficial effects of this invention are as follows: In this invention, the impermeable concrete utilizes an acrylate-styrene-acrylonitrile copolymer to composite carbon fiber and calcined dolomite, resulting in a composite material. Adding this composite material to concrete effectively improves its impermeability. Specifically, the acrylate-styrene-acrylonitrile copolymer composite treatment enhances the uniformity of carbon fiber and calcined dolomite within the asphalt system, thereby better utilizing the skeletal support of carbon fiber and the slight expansion effect of calcined dolomite within the system. Combined with cellulose fibers, this effectively reduces aggregate settling within the concrete, improving its structural stability. Furthermore, the acrylate-styrene-acrylonitrile copolymer composite treatment also improves the interfacial bonding between the carbon fiber / calcined dolomite and the asphalt in the system, resulting in a denser and more stable overall concrete structure, thus effectively enhancing its impermeability. Detailed Implementation
[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0025] In the following examples and comparative examples, the asphalt is petroleum asphalt, grade 70#; the cellulose fiber has an average length of 3 mm and an average diameter of 15 μm; the calcined dolomite has an average particle size of 150 μm; the acrylate-styrene-acrylonitrile copolymer has a grade of XC-500A; the cement is PO42.5 ordinary Portland cement; the quartz sand has an average particle size of 0.5 mm; the fly ash has an average particle size of 44 μm; and the silica fume has an average particle size of 100 μm.
[0026] Example 1 A method for preparing impermeable concrete includes the following steps: S0. Dissolve 2 parts of γ-glycidoxypropyltrimethoxysilane in an ethanol solution (volume fraction of 80%) to obtain a silane coupling agent solution. Mix 17 parts of carbon fiber (diameter of 7 μm, average aspect ratio of 43:1) and 3 parts of calcined dolomite, add them to the silane coupling agent solution, blend, and dry to obtain mixture I. Blend mixture I with 1 part of acrylate-styrene-acrylonitrile copolymer, melt, dry, and disperse to obtain a composite material. S1. Mix 30 parts cement, 50 parts crushed stone (average particle size 10mm), 50 parts crushed stone (average particle size 23mm), 40 parts medium quartz sand, 9 parts fly ash and 6 parts silica fume to obtain mixture II. S2. Mix 50 parts asphalt, 2 parts cellulose fiber, 5 parts composite material and the above mixture II at 160°C for 1.5 hours, then cool to obtain impermeable concrete.
[0027] Example 2 A method for preparing impermeable concrete includes the following steps: S0. Dissolve 2 parts of γ-glycidoxypropyltrimethoxysilane in an ethanol solution (volume fraction of 80%) to obtain a silane coupling agent solution. Mix 18 parts of carbon fiber (diameter of 7 μm, average aspect ratio of 43:1) and 2 parts of calcined dolomite, add them to the silane coupling agent solution, blend, and dry to obtain mixture I. Blend mixture I with 2 parts of acrylate-styrene-acrylonitrile copolymer, melt, dry, and disperse to obtain a composite material. S1. Mix 35 parts cement, 55 parts crushed stone (average particle size 10 mm), 55 parts crushed stone (average particle size 23 mm), 45 parts medium quartz sand, 12 parts fly ash and 8 parts silica fume to obtain mixture II. S2. Mix 50 parts asphalt, 3 parts cellulose fiber, 8 parts composite material and the above mixture II at 165°C for 1 hour, then cool to obtain impermeable concrete.
[0028] Example 3 A method for preparing impermeable concrete includes the following steps: S0. Dissolve 2 parts of γ-glycidoxypropyltrimethoxysilane in an ethanol solution (volume fraction of 80%) to obtain a silane coupling agent solution. Mix 19 parts of carbon fiber (diameter of 7 μm, average aspect ratio of 43:1) and 1 part of calcined dolomite, add the mixture to the silane coupling agent solution, blend, and dry to obtain mixture I. Blend mixture I with 2 parts of acrylate-styrene-acrylonitrile copolymer, melt, dry, and disperse to obtain a composite material. S1. Mix 40 parts cement, 80 parts crushed stone (average particle size 10mm), 40 parts crushed stone (average particle size 23mm), 50 parts medium quartz sand, 15 parts fly ash and 10 parts silica fume to obtain mixture II. S2. Mix 50 parts asphalt, 4 parts cellulose fiber, 10 parts composite material and the above mixture II at 170°C for 1 hour, then cool to obtain impermeable concrete.
[0029] Example 4 The only difference between this embodiment and Embodiment 2 is that in the preparation method of the composite material in this embodiment, the amount of acrylate-styrene-acrylonitrile copolymer added is 3 parts.
[0030] Example 5 The only difference between this embodiment and Embodiment 2 is that in the preparation method of the composite material in this embodiment, 5 parts of acrylate-styrene-acrylonitrile copolymer are added.
[0031] Example 6 The only difference between this embodiment and Embodiment 2 is that in the preparation method of the composite material in this embodiment, the amount of acrylate-styrene-acrylonitrile copolymer added is 7 parts.
[0032] Example 7 The only difference between this embodiment and embodiment 5 is that in the preparation method of the composite material in this embodiment, 18 parts of carbon fiber (7 μm in diameter, with an average aspect ratio of 43:1) are replaced with 7 parts of carbon fiber (7 μm in diameter, with an average aspect ratio of 43:1) and 11 parts of carbon fiber (7 μm in diameter, with an average aspect ratio of 2:1).
[0033] Example 8 The only difference between this embodiment and embodiment 5 is that in the preparation method of the composite material in this embodiment, 18 parts of carbon fiber (7 μm in diameter, with an average aspect ratio of 43:1) are replaced with 15 parts of carbon fiber (7 μm in diameter, with an average aspect ratio of 43:1) and 3 parts of carbon fiber (7 μm in diameter, with an average aspect ratio of 2:1).
[0034] Example 9 The only difference between this embodiment and embodiment 5 is that in the preparation method of the composite material in this embodiment, 18 parts of carbon fiber (7 μm in diameter, with an average aspect ratio of 43:1) are replaced with 9 parts of carbon fiber (7 μm in diameter, with an average aspect ratio of 43:1) and 9 parts of carbon fiber (7 μm in diameter, with an average aspect ratio of 2:1).
[0035] Example 10 The only difference between this embodiment and embodiment 5 is that in the preparation method of the composite material in this embodiment, 18 parts of carbon fiber (7 μm in diameter, average aspect ratio of 43:1) are replaced with 13.5 parts of carbon fiber (7 μm in diameter, average aspect ratio of 43:1) and 4.5 parts of carbon fiber (7 μm in diameter, average aspect ratio of 2:1).
[0036] Example 11 The only difference between this embodiment and Example 10 is that in the preparation method of the composite material in this embodiment, 18 parts of carbon fiber (7 μm in diameter, with an average aspect ratio of 43:1) are replaced with 13.5 parts of carbon fiber (7 μm in diameter, with an average aspect ratio of 43:1) and 4.5 parts of carbon fiber (7 μm in diameter, with an average aspect ratio of 8:1).
[0037] Example 12 The only difference between this embodiment and Example 10 is that in the preparation method of the composite material in this embodiment, 18 parts of carbon fiber (diameter of 7 μm, average aspect ratio of 43:1) are replaced with 13.5 parts of carbon fiber (diameter of 7 μm, average aspect ratio of 50:1) and 4.5 parts of carbon fiber (average particle size of 7 μm).
[0038] Comparative Example 1 The only difference between this comparative example and Example 2 is that, in the preparation method of the composite material in this comparative example, the acrylate-styrene-acrylonitrile copolymer is replaced with an equal amount of ethylene-vinyl acetate copolymer.
[0039] Comparative Example 2 The only difference between this comparative example and Example 2 is that, in the preparation method of the composite material in this comparative example, calcined dolomite is replaced with an equal amount of carbon fiber (7 μm in diameter and an average aspect ratio of 43:1).
[0040] Comparative Example 3 The only difference between this comparative example and Example 2 is the preparation method of the composite material in this comparative example, which is as follows: Two parts of γ-glycidoxypropyltrimethoxysilane were dissolved in an ethanol solution (volume fraction of 80%) to obtain a silane coupling agent solution. Eighteen parts of carbon fiber (diameter of 7 μm, average aspect ratio of 43:1) and two parts of calcined dolomite were mixed and added to the silane coupling agent solution, blended, and dried to obtain a composite material.
[0041] Experimental Example 1 The concrete prepared in Examples 1-6 and Comparative Examples 1-3 was tested for permeability coefficient according to the method in JTG E20-2011 "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering"; The test results are shown in Table 1. Table 1 Performance test results of Examples 1-6 and Comparative Examples 1-3
[0042] Compared with Comparative Examples 1-3, the concrete prepared in Examples 1-6 had a lower permeability coefficient, indicating that the composite material obtained by compounding carbon fiber, calcined dolomite, and acrylate-styrene-acrylonitrile copolymer and adding it to concrete can effectively improve the impermeability of concrete.
[0043] Experiment Example 2 The concrete prepared in Examples 5 and 7-12 was subjected to splitting tensile strength testing according to the method in JTG E20-2011 "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering". The concrete specimen was a cylindrical specimen with a diameter of 100 mm and a height of 40 mm. The test temperature was 15℃ and the loading rate was 50 mm / min. The test result was the average value of the three specimens. The test results are shown in Table 2.
[0044] Table 2 Performance test results of Examples 5 and 7-12
[0045] Compared with Examples 5 and 12, the splitting tensile strength of the concrete prepared in Examples 7 to 11 was improved, indicating that the use of two types of carbon fibers with average aspect ratios of 43:1 and 2 to 8:1, and the combined use of the two types of carbon fibers, effectively improved the structural stability of the concrete and enhanced its crack resistance.
[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A type of impermeable concrete, characterized in that, Includes the following components in parts by weight: 50 parts asphalt, 30-40 parts cement, 100-120 parts coarse aggregate, 40-50 parts fine aggregate, 15-25 parts fine mineral powder, 2-4 parts cellulose fiber, and 5-10 parts composite material; The raw materials for the composite material include the following components in parts by weight: 17-19 parts carbon fiber, 1-3 parts calcined dolomite, and 1-7 parts acrylate-styrene-acrylonitrile copolymer.
2. The impermeable concrete according to claim 1, characterized in that, The weight ratio of the carbon fiber and calcined dolomite to the acrylate-styrene-acrylonitrile copolymer is 20:3~5.
3. The impermeable concrete according to claim 1, characterized in that, The method for preparing the composite material includes the following steps: The carbon fiber and the calcined dolomite were mixed and then added to a silane coupling agent solution, blended, and dried to obtain mixture I; mixture I was then blended with the acrylate-styrene-acrylonitrile copolymer, melted, and dried to obtain a composite material.
4. The impermeable concrete according to claim 1, characterized in that, The carbon fiber includes a first carbon fiber and a second carbon fiber; The average aspect ratio of the first carbon fiber is 43:1; the average aspect ratio of the second carbon fiber is 2 to 8:
1.
5. The impermeable concrete according to claim 4, characterized in that, The weight ratio of the first carbon fiber to the second carbon fiber is 1 to 3:
1.
6. The impermeable concrete according to claim 1, characterized in that, The coarse aggregate includes first crushed stone and second crushed stone in a weight ratio of 1 to 2:1; The first crushed stone has a particle size of 8-12 mm, and the second crushed stone has a particle size of 20-25 mm.
7. The impermeable concrete according to claim 1, characterized in that, The fine aggregate is medium sand; The medium sand includes one or both of quartz sand and basalt sand.
8. The impermeable concrete according to claim 1, characterized in that, The mineral powder includes at least two of the following: fly ash, slag powder, and microsilica.
9. A method for preparing impermeable concrete, used to prepare the impermeable concrete as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. The cement, coarse aggregate, fine aggregate, and mineral powder are mixed in proportion to weight to obtain mixture II; S2. The asphalt, cellulose fiber, composite material and mixture II are blended together and cooled to obtain the impermeable concrete.
10. A method for preparing impermeable concrete according to claim 9, characterized in that, In step S2, the blending process takes place at a temperature of 160-170°C for 1-1.5 hours.