A pervious concrete and a method for preparing the same

Abstract

The application relates to the technical field of building materials, in particular to a pervious concrete and a preparation method thereof. The pervious concrete is prepared from raw materials including the following components in parts by weight: water 100-125 parts, cement 270-300 parts, coarse aggregate 1300-1500 parts, water reducing agent 8-15 parts, single-end hydroxyl silicone oil 15-40 parts, tannic acid 25-50 parts and amphiphilic cellulose 50-80 parts. The pervious concrete prepared by the application has good compressive strength and freeze-thaw resistance.

Description

Technical Field

[0001] This application relates to the field of building materials technology, and more specifically, to a permeable concrete and a method for preparing the same. Background Technology

[0002] Permeable concrete is a type of concrete with little or no fine aggregate. Its purpose is to create interconnected pores that allow water to drain quickly, preventing water accumulation and effectively alleviating urban flooding. Furthermore, rainwater can infiltrate into the soil, playing a significant role in replenishing groundwater resources. Additionally, the porosity of the concrete effectively absorbs noise, mitigating the urban heat island effect.

[0003] From a road application perspective, permeable concrete not only needs good permeability and strength, but also excellent freeze-thaw resistance. Especially in remote, frigid regions, permeable concrete may suffer freeze-thaw damage under prolonged low-temperature conditions, resulting in cracks and fissures, shortening its service life and causing economic losses. Therefore, improving the freeze-thaw resistance of permeable concrete is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] To address the problem of poor freeze-thaw resistance in permeable concrete, this application provides a permeable concrete and its preparation method.

[0005] In the first aspect, this application provides a permeable concrete, which adopts the following technical solution:

[0006] A permeable concrete is composed of the following raw materials in parts by weight: 100-125 parts water, 270-300 parts cement, 1300-1500 parts coarse aggregate, 8-15 parts water-reducing agent, 15-40 parts single-hydroxyl silicone oil, 25-50 parts tannic acid, and 50-80 parts amphiphilic cellulose.

[0007] By adopting the above technical solutions, tannic acid, single-hydroxyl-terminated silicone oil, and amphiphilic cellulose all contain active groups. These active groups can cross-link with each other to form a cross-linked network in the concrete system, improving the stability of the permeable concrete structure and enhancing its compressive strength and freeze-thaw resistance. In addition, tannic acid can also complex with calcium ions in the permeable concrete system, reducing the content of soluble calcium in the system, reducing the possibility of permeable concrete erosion, and improving the durability and freeze-thaw resistance of the concrete. The silicone end of the single-hydroxyl-terminated silicone oil and the oleophilic end of the amphiphilic cellulose work together to form a hydrophobic layer on the surface of the binder that encapsulates the coarse aggregate, allowing water to pass more smoothly through the internal pores of the permeable concrete without lingering and clogging them. This reduces the possibility of freeze-thaw damage to the concrete caused by long-term water accumulation inside the permeable concrete, further improving the freeze-thaw resistance of the permeable concrete.

[0008] Preferably, the single-hydroxyl-terminated silicone oil is 30-40 parts by weight.

[0009] Preferably, the tannic acid is present in 40-50 parts by weight.

[0010] Preferably, the amphiphilic cellulose is prepared by reacting cellulose and octenyl succinic anhydride in a mass ratio of (10-20):1.

[0011] Preferably, the mass ratio of cellulose to octenyl succinic anhydride is (15-20):1.

[0012] Preferably, the raw materials of the permeable concrete further include 20-35 parts of hyperbranched polyester; the hyperbranched polyester is one or more of terminal hydroxyl hyperbranched polyester, terminal carboxyl hyperbranched polyester, terminal amino hyperbranched polyester, and terminal epoxy hyperbranched polyester.

[0013] By adopting the above technical solution, the hyperbranched polyester contains a large number of active groups, which can crosslink and bond with other active groups in the concrete system; in addition, the hyperbranched polyester also contains a large number of branched structures, which can physically entangle with the chain segments in single-ended hydroxyl silicone oil, tannic acid and amphiphilic cellulose; the stability of permeable concrete structure is further improved by the above method, and its compressive strength and freeze-thaw resistance are improved.

[0014] Preferably, the hyperbranched polyester is a hydroxyl-terminated hyperbranched polyester and / or a carboxyl-terminated hyperbranched polyester.

[0015] By adopting the above technical solutions, hydroxyl-terminated hyperbranched polyester and carboxyl-terminated hyperbranched polyester have a synergistic effect in improving the compressive strength and freeze-thaw resistance of permeable concrete.

[0016] Preferably, the raw materials of the permeable concrete also contain 20-40 parts of reinforcing fiber.

[0017] By adopting the above technical solutions, the addition of reinforcing fibers can further improve the compressive strength and freeze-thaw resistance of permeable concrete.

[0018] Preferably, the reinforcing fiber is one or more selected from polypropylene fiber, polyvinyl alcohol fiber, polyester fiber, polyamide fiber, and polyacrylonitrile fiber.

[0019] Secondly, this application provides a method for preparing permeable concrete, which adopts the following technical solution:

[0020] A method for preparing permeable concrete includes the following steps: mixing cement and coarse aggregate to obtain a mixture; mixing the mixture with water, water-reducing agent, single-terminated silicone oil, tannic acid, and amphiphilic cellulose to obtain permeable concrete.

[0021] In summary, this application has the following beneficial effects:

[0022] 1. This application incorporates single-hydroxyl-terminated silicone oil, tannic acid, and amphiphilic cellulose into the raw materials of permeable concrete. All three substances contain active groups, which can cross-link with each other to form a cross-linked network in the concrete system, thereby improving the stability of the permeable concrete structure and enhancing its compressive strength and freeze-thaw resistance. In addition, tannic acid can complex with calcium ions in the permeable concrete system, reducing the possibility of permeable concrete erosion and improving the durability and freeze-thaw resistance of the concrete. The silicone end of the single-hydroxyl-terminated silicone oil and the oleophilic end of the amphiphilic cellulose work together to form a hydrophobic layer on the surface of the binder that encapsulates the coarse aggregate, allowing water to pass more smoothly through the internal pores of the permeable concrete without lingering and clogging them. This reduces the possibility of freeze-thaw damage to the concrete caused by long-term water accumulation inside, further improving the freeze-thaw resistance of the permeable concrete.

[0023] 2. In this application, hyperbranched polyester is preferably added to the raw materials of permeable concrete. The hyperbranched polyester contains a large number of active groups, which can crosslink and bond with other active groups in the concrete system. In addition, the hyperbranched polyester also contains a large number of branched structures, which can physically entangle with the chain segments in single-ended hydroxyl silicone oil, tannic acid and amphiphilic cellulose. The stability of the permeable concrete structure is further improved by the above method, and its compressive strength and freeze-thaw resistance are improved. Detailed Implementation

[0024] The present application will be further described in detail below with reference to the embodiments.

[0025] Unless otherwise specified, the specifications of the raw materials used in the following examples and comparative examples are detailed in Table 1.

[0026] Table 1. Raw material specifications information

[0027]

[0028]

[0029] Preparation example of amphiphilic cellulose

[0030] Preparation Example 1

[0031] Amphiphilic cellulose is prepared according to the following steps:

[0032] 14.55 kg of cellulose and 30 L of N,N-dimethylacetamide were mixed, heated to 80 °C, and kept at this temperature for 1 hour. Then, 700 g of 4-dimethylaminopyridine and 500 g of triethylamine were added and mixed thoroughly. 1.45 kg of octenyl succinic anhydride was added, and the mixture was heated to 100 °C and kept at this temperature for 3 hours to obtain the cellulose esterification product. An 80% ethanol-water mixture was added to precipitate the cellulose esterification product. After centrifugation, the supernatant was discarded to obtain the precipitate. The precipitate was washed, centrifuged, and dried to obtain amphiphilic cellulose.

[0033] Preparation Example 2

[0034] Amphiphilic cellulose is prepared according to the following steps:

[0035] 15.24 kg of cellulose and 30 L of N,N-dimethylacetamide were mixed, heated to 80 °C, and kept at this temperature for 1 h. Then, 700 g of 4-dimethylaminopyridine and 500 g of triethylamine were added and mixed thoroughly. 0.76 kg of octenyl succinic anhydride was added, and the mixture was heated to 100 °C and kept at this temperature for 3 h to obtain the cellulose esterification product. An 80% ethanol-water mixture was added to precipitate the cellulose esterification product. After centrifugation, the supernatant was discarded to obtain the precipitate. The precipitate was washed, centrifuged, and dried to obtain amphiphilic cellulose.

[0036] Preparation Example 3

[0037] Amphiphilic cellulose is prepared according to the following steps:

[0038] Take 15 kg of cellulose and 30 L of N,N-dimethylacetamide, mix them, heat to 80 °C, keep warm for 1 h, then add 700 g of 4-dimethylaminopyridine and 500 g of triethylamine, mix well, add 1 kg of octenyl succinic anhydride, heat to 100 °C, keep warm for 3 h to obtain cellulose esterification product, add 80% ethanol-water mixture to precipitate cellulose esterification product, centrifuge and discard the supernatant to obtain precipitate, the precipitate is washed, centrifuged and dried to obtain amphiphilic cellulose.

[0039] Example 1

[0040] A permeable concrete, the formula of which is as follows:

[0041] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.15 kg single-hydroxyl silicone oil, 0.25 kg tannic acid, and 0.5 kg amphiphilic cellulose.

[0042] A permeable concrete is prepared according to the following steps:

[0043] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-terminated silicone oil, tannic acid, and amphiphilic cellulose prepared in Preparation Example 1 to obtain permeable concrete.

[0044] Example 2

[0045] A permeable concrete, the formula of which is as follows:

[0046] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.15 kg single-hydroxyl silicone oil, 0.25 kg tannic acid, and 0.5 kg amphiphilic cellulose.

[0047] A permeable concrete is prepared according to the following steps:

[0048] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-hydroxyl silicone oil, tannic acid, and amphiphilic cellulose prepared in Preparation Example 2 to obtain permeable concrete.

[0049] Example 3

[0050] A permeable concrete, the formula of which is as follows:

[0051] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.15 kg single-hydroxyl silicone oil, 0.25 kg tannic acid, and 0.5 kg amphiphilic cellulose.

[0052] A permeable concrete is prepared according to the following steps:

[0053] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-hydroxyl silicone oil, tannic acid, and amphiphilic cellulose prepared in Preparation Example 3 to obtain permeable concrete.

[0054] Example 4

[0055] A permeable concrete, the formula of which is as follows:

[0056] 1.25 kg water, 3 kg cement, 15 kg coarse aggregate, 0.15 kg water-reducing agent, 0.4 kg single-hydroxyl silicone oil, 0.5 kg tannic acid, and 0.8 kg amphiphilic cellulose.

[0057] A permeable concrete is prepared according to the following steps:

[0058] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-terminated silicone oil, tannic acid, and amphiphilic cellulose prepared in Preparation Example 1 to obtain permeable concrete.

[0059] Example 5

[0060] A permeable concrete, the formula of which is as follows:

[0061] 1.1 kg water, 2.8 kg cement, 14 kg coarse aggregate, 0.1 kg water-reducing agent, 0.3 kg single-hydroxyl silicone oil, 0.4 kg tannic acid, and 0.6 kg amphiphilic cellulose.

[0062] A permeable concrete is prepared according to the following steps:

[0063] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-terminated silicone oil, tannic acid, and amphiphilic cellulose prepared in Preparation Example 1 to obtain permeable concrete.

[0064] Example 6

[0065] A permeable concrete, the formula of which is as follows:

[0066] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.15 kg single-hydroxyl-terminated silicone oil, 0.25 kg tannic acid, 0.5 kg amphiphilic cellulose, and 0.2 kg hydroxyl-terminated hyperbranched polyester.

[0067] A permeable concrete is prepared according to the following steps:

[0068] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-hydroxyl silicone oil, tannic acid, hydroxyl-terminated hyperbranched polyester, and amphiphilic cellulose prepared in Example 1 to obtain permeable concrete.

[0069] Example 7

[0070] A permeable concrete, the formula of which is as follows:

[0071] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.15 kg single-hydroxyl silicone oil, 0.25 kg tannic acid, 0.5 kg amphiphilic cellulose, and 0.2 kg carboxyl-terminated hyperbranched polyester.

[0072] A permeable concrete is prepared according to the following steps:

[0073] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-hydroxyl silicone oil, tannic acid, carboxyl-terminated hyperbranched polyester, and amphiphilic cellulose prepared in Example 1 to obtain permeable concrete.

[0074] Example 8

[0075] A permeable concrete, the formula of which is as follows:

[0076] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.15 kg single-hydroxyl-terminated silicone oil, 0.25 kg tannic acid, 0.5 kg amphiphilic cellulose, 0.1 kg hydroxyl-terminated hyperbranched polyester, and 0.1 kg carboxyl-terminated hyperbranched polyester.

[0077] A permeable concrete is prepared according to the following steps:

[0078] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-hydroxyl-terminated silicone oil, tannic acid, hydroxyl-terminated hyperbranched polyester, carboxyl-terminated hyperbranched polyester, and amphiphilic cellulose prepared in Example 1 to obtain permeable concrete.

[0079] Example 9

[0080] A permeable concrete, the formula of which is as follows:

[0081] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.15 kg single-hydroxyl silicone oil, 0.25 kg tannic acid, 0.5 kg amphiphilic cellulose, and 0.35 kg carboxyl-terminated hyperbranched polyester.

[0082] A permeable concrete is prepared according to the following steps:

[0083] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-hydroxyl silicone oil, tannic acid, carboxyl-terminated hyperbranched polyester, and amphiphilic cellulose prepared in Example 1 to obtain permeable concrete.

[0084] Example 10

[0085] A permeable concrete, the formula of which is as follows:

[0086] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.15 kg single-ended hydroxyl silicone oil, 0.25 kg tannic acid, 0.5 kg amphiphilic cellulose, and 0.2 kg polypropylene fiber.

[0087] A permeable concrete is prepared according to the following steps:

[0088] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-hydroxyl silicone oil, tannic acid, amphiphilic cellulose obtained in Preparation Example 1, and polypropylene fiber to obtain permeable concrete.

[0089] Example 11

[0090] A permeable concrete, the formula of which is as follows:

[0091] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.15 kg single-ended hydroxyl silicone oil, 0.25 kg tannic acid, 0.5 kg amphiphilic cellulose, and 0.4 kg polypropylene fiber.

[0092] A permeable concrete is prepared according to the following steps:

[0093] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-hydroxyl silicone oil, tannic acid, amphiphilic cellulose obtained in Preparation Example 1, and polypropylene fiber to obtain permeable concrete.

[0094] Example 12

[0095] A permeable concrete, the formula of which is as follows:

[0096] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.15 kg single-ended hydroxyl silicone oil, 0.25 kg tannic acid, 0.5 kg amphiphilic cellulose, and 0.2 kg polyester fiber.

[0097] A permeable concrete is prepared according to the following steps:

[0098] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-terminated silicone oil, tannic acid, amphiphilic cellulose obtained in Preparation Example 1, and polyester fiber to obtain permeable concrete.

[0099] Comparative Example 1

[0100] A permeable concrete, the formula of which is as follows:

[0101] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.4 kg single-ended hydroxyl silicone oil, and 0.5 kg tannic acid.

[0102] A permeable concrete is prepared according to the following steps:

[0103] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-terminated silicone oil, and tannic acid to obtain permeable concrete.

[0104] Comparative Example 2

[0105] A permeable concrete, the formula of which is as follows:

[0106] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.3 kg single-ended hydroxyl silicone oil, and 0.6 kg amphiphilic cellulose.

[0107] A permeable concrete is prepared according to the following steps:

[0108] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, a water-reducing agent, a single-terminated hydroxyl silicone oil, and the amphiphilic cellulose prepared in Preparation Example 1 to obtain permeable concrete.

[0109] Comparative Example 3

[0110] A permeable concrete, the formula of which is as follows:

[0111] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.3 kg tannic acid, and 0.6 kg amphiphilic cellulose.

[0112] A permeable concrete is prepared according to the following steps:

[0113] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, tannic acid, and amphiphilic cellulose prepared in Preparation Example 1 to obtain permeable concrete.

[0114] Comparative Example 4

[0115] A permeable concrete, the formula of which is as follows:

[0116] 1 kg water, 2.7 kg cement, 13 kg coarse aggregate, 0.08 kg water-reducing agent, 0.15 kg single-hydroxyl silicone oil, 0.25 kg tannic acid, and 0.5 kg cellulose.

[0117] A permeable concrete is prepared according to the following steps:

[0118] Cement and coarse aggregate are mixed to obtain a mixture; the mixture is then mixed with water, water-reducing agent, single-ended hydroxyl silicone oil, tannic acid, and cellulose to obtain permeable concrete.

[0119] Detection methods

[0120] The permeable concrete prepared in Examples 1-12 and Comparative Examples 1-4 was poured into the mold in two layers. At the same time, it was tamped 20 times with a metal rod with a diameter of 20 mm until it was parallel to the top surface of the mold. Then, the mold was placed on a mechanical vibration table and vibrated for 5 seconds before being removed immediately. Concrete was poured into the mold again and manually vibrated 20 times until the concrete was compacted in the mold. The excess concrete was removed and smoothed. The mold was then sealed with a film and placed in a standard curing room for water curing for 24 hours before demolding. The temperature of the standard curing room was set to 20°C and the humidity to 96%. Curing was carried out for 28 days to obtain a 100 mm × 100 mm × 100 mm specimen.

[0121] According to GB / T 25993-2010, the permeability coefficient of the above specimens was tested. The test results showed that the permeability coefficient of the permeable concrete prepared in the examples and comparative examples met the requirements.

[0122] According to GB / T 50081-2002, the 28-day compressive strength of the above specimens was tested, and the specific test results are shown in Table 2 below. According to GB / T 50082-2009, the freeze-thaw resistance of the above specimens was tested. The specimens were immersed in water at (20±2)℃ for 4 days. After being removed and dried, the specimens were placed in a freeze-thaw cycle tester to begin the freeze-thaw cycle test. The lowest temperature of the specimens was (-18±2)℃, and the highest temperature was (5±1)℃. The freeze-thaw cycle time was 8 hours per cycle. The temperature was lowered to -20℃ at a rate of 10℃ / h, held at that temperature for 1.5 hours, and then raised to 5℃ and held at that temperature for 1 hour, constituting one cycle. After 60 cycles, the specimens were weighed and the mass loss rate was calculated as P = (M0 - M60) / M0 × 100%.

[0123] P represents the mass loss rate after 60 freeze-thaw cycles; M0 represents the initial mass of the specimen before the freeze-thaw cycles; M60 represents the mass of the specimen after the 60th freeze-thaw cycle. The specific test results are shown in Table 2 below:

[0124] Table 2. Performance testing of permeable concrete

[0125]

[0126] As shown in Table 2, the permeable concrete prepared in the embodiments of this application has a 28-day compressive strength ≥32.1MPa and a mass loss rate ≤0.98% after 60 freeze-thaw cycles. The permeable concrete has high compressive strength and good freeze-thaw resistance.

[0127] Combining Example 1 and Comparative Examples 1-4 with Table 2, it can be seen that the 28-day compressive strength of the permeable concrete prepared in Example 1 is much greater than that in Comparative Examples 1-4, while the mass loss rate after 60 freeze-thaw cycles is much smaller than that in Comparative Examples 1-4. This may be because: Comparative Example 1 does not contain amphiphilic cellulose, Comparative Example 2 does not contain tannic acid, Comparative Example 3 does not contain single-terminated hydroxyl silicone oil, and Comparative Example 4 uses ordinary cellulose instead of the amphiphilic cellulose prepared in the preparation example; while in Example 1, single-terminated hydroxyl silicone oil, tannic acid, and amphiphilic cellulose were added to the raw materials of the permeable concrete. All three substances contain active groups, which can cross-link with each other in the concrete body. The system forms a cross-linked network, improving the stability of the permeable concrete structure and enhancing its compressive strength and freeze-thaw resistance. Furthermore, tannic acid can complex with calcium ions in the permeable concrete system, reducing the possibility of dissolution and improving the concrete's durability and freeze-thaw resistance. The silicone end of the single-hydroxyl-terminated silicone oil and the oleophilic end of the amphiphilic cellulose work together to form a hydrophobic layer on the surface of the binder encapsulating the coarse aggregate. This allows water to pass more smoothly through the internal pores of the permeable concrete, preventing blockage and reducing the likelihood of freeze-thaw damage caused by long-term water accumulation, further improving the freeze-thaw resistance of the permeable concrete.

[0128] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A permeable concrete, characterized in that: It is composed of the following raw materials in parts by weight: 100-125 parts water, 270-300 parts cement, 1300-1500 parts coarse aggregate, 8-15 parts water-reducing agent, 15-40 parts single-hydroxyl silicone oil, 25-50 parts tannic acid, and 50-80 parts amphiphilic cellulose; wherein the amphiphilic cellulose is prepared by reacting cellulose and octenyl succinic anhydride in a mass ratio of (10-20):

1.

2. The permeable concrete according to claim 1, characterized in that: The single-hydroxyl-terminated silicone oil is present in parts by weight of 30-40.

3. The permeable concrete according to claim 1, characterized in that: The tannic acid is present in parts by weight of 40-50 parts.

4. The permeable concrete according to claim 1, characterized in that: The mass ratio of cellulose to octenyl succinic anhydride is (15-20):

1.

5. The permeable concrete according to claim 1, characterized in that: The raw materials of the permeable concrete also contain 20-35 parts of hyperbranched polyester; the hyperbranched polyester is one or more of terminal hydroxyl hyperbranched polyester, terminal carboxyl hyperbranched polyester, terminal amino hyperbranched polyester, and terminal epoxy hyperbranched polyester.

6. The permeable concrete according to claim 5, characterized in that: The hyperbranched polyester is a hydroxyl-terminated hyperbranched polyester and / or a carboxyl-terminated hyperbranched polyester.

7. The permeable concrete according to claim 1, characterized in that: The permeable concrete also contains 20-40 parts of reinforcing fibers in its raw materials.

8. The permeable concrete according to claim 7, characterized in that: The reinforcing fiber is one or more of the following: polypropylene fiber, polyvinyl alcohol fiber, polyester fiber, polyamide fiber, and polyacrylonitrile fiber.

9. A method for preparing permeable concrete according to any one of claims 1-4, characterized in that: The process includes the following steps: mixing cement and coarse aggregate to obtain a mixture; mixing the mixture with water, water-reducing agent, single-ended hydroxyl silicone oil, tannic acid, and amphiphilic cellulose to obtain permeable concrete.

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