Epoxy resin modified pervious concrete and method for preparing the same
By using a compound curing agent of 1,3-bis(aminomethyl)cyclohexane and diallyl terephthalate in permeable concrete, and combining it with TPU and easily hydrolyzable polyester to form mass and heat transfer channels, the problem of mismatch between epoxy resin curing time and hydration reaction was solved, thus improving the early strength and permeability of permeable concrete.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TAIZHOU EAST BUILDING MATERIALS TECH CO LTD
- Filing Date
- 2024-01-16
- Publication Date
- 2026-06-16
AI Technical Summary
In existing permeable concrete, the curing time of epoxy resin in the early hydration reaction is not matched with the hydration reaction of concrete, which limits the early strength improvement and affects the service life of the pavement.
A compound of 1,3-bis(aminomethyl)cyclohexane and diallyl terephthalate was used as a curing agent to extend the initial curing time of epoxy resin in an aqueous environment. It was combined with TPU and easily hydrolyzed polyester to form mass transfer and heat transfer channels and regulate the heat of hydration reaction.
It promotes the early hydration reaction of epoxy resin modified permeable concrete, improves the mechanical properties and permeability of concrete, and extends the service life of the pavement.
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Abstract
Description
Technical Field
[0001] This application relates to building materials, and in particular to an epoxy resin modified permeable concrete and its preparation method. Background Technology
[0002] Permeable concrete is a special type of concrete commonly used for road paving. It typically involves adjusting the aggregate size and water-cement ratio to create numerous interconnected pores within the concrete. During rain or when water accumulates on the road surface, permeable concrete allows water to quickly infiltrate through these interconnected pores, reducing or mitigating the water accumulation.
[0003] On the other hand, due to the numerous interconnected pores in permeable concrete, its mechanical strength is lower than that of ordinary concrete. To extend the service life of pavements, modifiers are added to existing permeable concrete to improve its mechanical properties while maintaining its permeability. Epoxy resin has excellent adhesion and bonds well to concrete, enhancing the adhesion to the concrete surface and thus improving its strength and durability. Adding epoxy resin is a good and already applied method for improving permeable concrete.
[0004] However, during application, it can be found that: depending on the concrete raw material ratio, the hydration reaction time for the concrete itself to improve its strength is 10 to 20 days, while the complete curing time of epoxy resin is at most 3 to 5 days, and the initial curing time of epoxy resin in an underwater environment is only 5 to 12 hours; after the concrete is poured or laid, the initially cured epoxy resin and the fully cured epoxy resin will hinder the transport of water-soluble minerals in the concrete, which will hinder the hydration reaction in the early stage (first 28 days) of the concrete. The strength gain of permeable concrete through its own hydration reaction cannot be maximized. Summary of the Invention
[0005] To enhance the early hydration reaction of epoxy resin-modified permeable concrete, an epoxy resin-modified permeable concrete and its preparation method are provided.
[0006] The first inventive objective of this invention is achieved through the following technical solution:
[0007] An epoxy resin modified permeable concrete comprises the following raw materials in parts by weight:
[0008] 100 parts cement;
[0009] 120-130 parts of aggregate;
[0010] 110-127 parts of sand;
[0011] 45-53 parts water;
[0012] 8.4–14.3 parts epoxy resin;
[0013] 0.5–0.71 parts of 1,3-bis(aminomethyl)cyclohexane;
[0014] Diallyl terephthalate, 0.04–0.066 parts.
[0015] By adopting the above technical solution, the compounding of 1,3-bis(aminomethyl)cyclohexane as a curing agent and diallyl terephthalate in this application extends the initial curing time of epoxy resin in an aqueous environment to 24-25.5 hours, promotes the effective early hydration reaction in epoxy resin modified permeable concrete, improves the strength enhancement benefits brought by the hydration reaction of epoxy resin modified permeable concrete itself, enhances the mechanical properties of epoxy resin modified permeable concrete, and extends the service life of the pavement.
[0016] Optionally, it also includes 0.8 to 2.1 parts of TPU.
[0017] By adopting the above technical solution, during the curing process of epoxy resin modified permeable concrete, the hydration heat and the curing heat of epoxy resin release heat. After the initial setting of epoxy resin modified permeable concrete, its internal temperature continues to rise until the heat of hydration reaches its peak. During the curing process of epoxy resin modified permeable concrete pavement, water will be added. In this case, the epoxy resin modified permeable concrete TPU is in a high humidity heating state and undergoes hydrolysis. The hydrolysis phenomenon is more significant, especially in the area where the hydration reaction is intense. This causes cracks to appear on the original TPU surface, which in turn creates channels between TPU and concrete materials that allow water to pass through through capillary penetration. After water seeps into these channels, it will form mass transfer channels and heat transfer channels in opposite directions.
[0018] The area with intense hydration reaction consumes a large amount of water, which is replenished by the water phase outside the area to keep the hydration reaction going. The heat of hydration reaction is conducted outward through the water in the replenishment channel, and the newly replenished water also serves as an external low-temperature medium. Thus, the area with intense hydration reaction is cooled in two ways.
[0019] The heat conducted outward raises the temperature of the surrounding concrete, increases the activation energy for the hydration reaction, promotes the hydration reaction of the surrounding concrete, and triggers the hydrolysis of TPU within it, extending and diffusing the mass transfer and heat transfer channels.
[0020] This utilizes the heat of hydration of concrete itself to promote the hydrolysis of TPU, forming mass transfer and heat transfer channels that regulate the heat of hydration of concrete. The more intense the hydration reaction in a region, the more it can promote the hydration reaction process of other surrounding concrete while simultaneously reducing the peak hydration heat in its own region. This allows epoxy resin modified permeable concrete to undergo more hydration reactions in its early stages under low peak hydration heat conditions without external intervention, thereby increasing the strength of epoxy resin modified permeable concrete. The mass transfer and heat transfer channels formed in this process can also improve the permeability of epoxy resin modified permeable concrete after it recovers from the heat of hydration.
[0021] Optionally, the amount of TPU used is 1.7 to 2.1 parts.
[0022] By adopting the above technical solution, when TPU is added alone, the amount of TPU is 1.7 to 2.1 parts, and the resulting epoxy resin modified permeable concrete has better mechanical strength and permeability.
[0023] Optionally, it also includes 0.7 to 1.4 parts of easily hydrolyzable polyester; the easily hydrolyzable polyester is obtained by polymerizing terephthalic acid, isophthalic acid and ethylene glycol, and then polycondensing it with polyethylene glycol.
[0024] Alternatively, the preparation method of the easily hydrolyzable ester is as follows:
[0025] Terephthalic acid and isophthalic acid are mixed to obtain reactive acid A;
[0026] Ethylene glycol and reactive acid A were added to an esterification reactor at a mass ratio of 1.71:1 and esterification was carried out under a catalyst until the esterification rate reached 89±1%, yielding the first esterified material. The first esterified material, polyethylene glycol, sodium 1,3-isophthalate dihydroxyethyl ester-5-sulfonate (SIPE), and stabilizer were mixed and subjected to a polycondensation reaction at 200°C. After the reaction was completed, an easily hydrolyzable polyester was obtained.
[0027] By adopting the above technical solution, the easily hydrolyzable polyester, after being mixed, adheres to the aggregate, sand, and cement particles. During the curing process of epoxy resin modified permeable concrete, it will also partially hydrolyze, creating pores between the aggregate, sand, and cement particles, forming heat and mass transfer channels for water migration. This process improves the hydration reaction of the concrete and simultaneously reduces the peak hydration heat of its own area, thereby increasing the strength of epoxy resin modified permeable concrete. After the overall epoxy resin modified permeable concrete recovers from the hydration heat, its permeability is improved.
[0028] Optionally, it may also include 0.8 to 1.3 parts of TPU and 0.8 to 1.1 parts of hydrolyzable polyester.
[0029] By adopting the above technical solution, TPU and easily hydrolyzable polyester are used in combination in the epoxy resin modified permeable concrete of this application, which can improve the hydration reaction promotion effect and the hydration heat conduction effect, and improve the mechanical properties and permeability of epoxy resin modified permeable concrete.
[0030] The second objective of this invention is achieved through the following technical solution:
[0031] A method for preparing epoxy resin modified permeable concrete, comprising the following steps:
[0032] Mix all raw materials other than aggregates evenly and then mix them with aggregates to obtain epoxy resin modified permeable concrete.
[0033] By adopting the above technical solution, the preparation method is simple and convenient, and the production efficiency is high.
[0034] In addition, when the raw materials contain easily hydrolyzable polyester, the preparation method of epoxy resin modified permeable concrete shall be carried out according to the following steps:
[0035] Water, epoxy resin, and easily hydrolyzed polyester are mixed evenly, and then sand and cement are added to mix and obtain a gel material. The gel material is then mixed evenly with the remaining raw materials to obtain epoxy resin modified permeable concrete.
[0036] By adopting the above technical solution, if the easily hydrolyzable polyester is directly mixed with cement, it is easily absorbed by cement particles and has less contact with sand and aggregates, resulting in a reduction in the formation of heat and mass transfer channels. By first mixing it evenly with water and epoxy resin for dilution, and then mixing it with other raw materials, the easily hydrolyzable polyester is mixed more evenly with cement, sand and aggregates, and the resulting epoxy resin modified permeable concrete has better mechanical properties and permeability.
[0037] In summary, this application has at least the following beneficial effects:
[0038] In this application, 1,3-bis(aminomethyl)cyclohexane is used as a curing agent in combination with diallyl terephthalate. This extends the initial curing time of epoxy resin in an aqueous environment to 24–25.5 hours, effectively promoting the early hydration reaction in epoxy resin-modified permeable concrete. This enhances the strength-increasing benefits of the epoxy resin-modified permeable concrete's own hydration reaction, improves its mechanical properties, and extends the service life of the pavement. Detailed Implementation
[0039] raw material:
[0040] The epoxy resins are Phoenix E44 epoxy resin and Nanya 128 type epoxy resin.
[0041] The cement is 42.5 standard Portland cement.
[0042] The aggregates are commercially available machine-made aggregates from Mianchi Zhongji New Materials Co., Ltd., with coarse aggregate particle size of 20-25 mm and fine aggregate particle size of 8-15 mm. In this application, the aggregate ratio of coarse to fine aggregate is 1:1.42.
[0043] The sand is manufactured sand with a fineness of 0.8–1 mm.
[0044] 1,3-Bis(aminomethyl)cyclohexane was purchased from Zengcheng Huishun Chemical Co., Ltd.
[0045] Diallyl terephthalate is a commercially available product of Zhongshan Dixin Chemical Co., Ltd.
[0046] TPU is a commercially available product of Dongguan Xinshengli Plastic New Material Technology Co., Ltd., in powder form of 200±10μm.
[0047] Preparation Example 1
[0048] Preparation of easily hydrolyzable polyesters:
[0049] Terephthalic acid and isophthalic acid are mixed in a mass ratio of 0.61:0.39 to obtain reactive acid A;
[0050] Ethylene glycol and reactive acid A were added to an esterification reactor at a mass ratio of 1.71:1. The reaction was carried out at 267℃, 0.08MPa, and with antimony trioxide as a catalyst until the esterification rate reached 89±1%. The amount of antimony trioxide added was 0.06wt% of the reactive acid in the esterification reactor. The product obtained after dehydration and separation was the first esterification material. The first esterification material, polyethylene glycol 2000, sodium 1,3-isophthalate dihydroxyethyl ester-5-sulfonate (SIPE), and dimethyl silicone oil were mixed at a mass ratio of 100:7.61:1.7:0.009 and subjected to polycondensation reaction at 200℃ and 0.02MPa vacuum for 55 min. After the reaction was completed, an easily hydrolyzable polyester was obtained.
[0051] Example 1
[0052] An epoxy resin modified permeable concrete is obtained by mixing the following raw materials:
[0053] 1000 kg cement, 1270 kg aggregate, 1220 kg sand, 500 kg water, 138 kg epoxy resin, 6.7 kg 1,3-bis(aminomethyl)cyclohexane, and 0.57 kg diallyl terephthalate.
[0054] The aggregate particle size is [value missing], the sand particle size is [value missing], and the epoxy resin used is Phoenix E44.
[0055] The preparation method of epoxy resin modified permeable concrete is as follows:
[0056] 1000 kg of cement, 1220 kg of sand, 500 kg of water, 138 kg of epoxy resin, 6.7 kg of 1,3-bis(aminomethyl)cyclohexane, and 0.57 kg of diallyl terephthalate are added to a mixer and mixed. After the mixture is evenly mixed, aggregates are added to the mixture and mixed evenly to obtain epoxy resin modified permeable concrete.
[0057] Example 2
[0058] An epoxy resin modified permeable concrete differs from Example 1 in that the epoxy resin used is Nan Ya 128 type.
[0059] Comparative Example 1
[0060] An epoxy resin modified permeable concrete is prepared by mixing the following raw materials: 1000 kg of cement, 1270 kg of aggregate, 1220 kg of sand, 500 kg of water, 138 kg of epoxy resin, and 6.7 kg of 1,3-bis(aminomethyl)cyclohexane. The preparation method is as follows: 1000 kg of cement, 1220 kg of sand, 500 kg of water, 138 kg of epoxy resin, and 6.7 kg of 1,3-bis(aminomethyl)cyclohexane are added to a mixing machine and mixed evenly to obtain a mixture. Then, the aggregate is added to the mixture and mixed evenly to obtain the epoxy resin modified permeable concrete.
[0061] Comparative Example 2
[0062] An epoxy resin modified permeable concrete is prepared by mixing the following raw materials: 1000 kg of cement, 1270 kg of aggregate, 1220 kg of sand, 500 kg of water, 138 kg of epoxy resin, and 6.7 kg of hexamethylenediamine; the preparation method is as follows:
[0063] 1000 kg of cement, 1220 kg of sand, 500 kg of water, 138 kg of epoxy resin, and 6.7 kg of hexamethylenediamine are put into a mixer and mixed. After mixing evenly, the aggregate is added into the mixture and mixed evenly to obtain epoxy resin modified permeable concrete.
[0064] Comparative Example 3
[0065] An epoxy resin modified permeable concrete is prepared by mixing the following raw materials: 1000 kg of cement, 1270 kg of aggregate, 1220 kg of sand, 500 kg of water, 138 kg of epoxy resin, 6.7 kg of hexamethylenediamine, and 0.57 kg of diallyl terephthalate; the preparation method is as follows:
[0066] 1000 kg of cement, 1220 kg of sand, 500 kg of water, 138 kg of epoxy resin, 6.7 kg of hexamethylenediamine, and 0.57 kg of diallyl terephthalate are put into a mixer and mixed. After being mixed evenly, the aggregate is added into the mixture and mixed evenly to obtain epoxy resin modified permeable concrete.
[0067] The epoxy resin modified permeable concretes obtained in Examples 1-2 and Comparative Examples 1-3 were tested. The tests included compressive strength, flexural strength, permeability, and the water curing time of the epoxy resin compositions used in Examples 1-2 and Comparative Examples 1-3.
[0068] The compressive strength and flexural strength were tested according to the GB / T 50081-2019 standard for test methods of physical and mechanical properties of concrete. The samples of epoxy resin modified permeable concrete cured for 7 days (7d) and 28 days (28d) were tested.
[0069] The permeability was tested according to DB11 / T 775-2021 Technical Specification for Porous Concrete Pavement. The test results were expressed as continuous porosity, and the larger the continuous porosity, the better the permeability.
[0070] Water curing time test of epoxy resin composition
[0071] The purpose of this test is to study the change in curing time of simulated epoxy resin compositions in free water in concrete. The specific test method is as follows:
[0072] Mix the epoxy resin, curing agent, and curing compounding agent in each example according to the proportion to obtain an epoxy resin composition. Pour 100g of the epoxy resin composition into a container with a length of 10cm, a width of 5cm, and a height of 5cm, spread it evenly, and scrape the surface of the epoxy resin composition smooth (this step is completed within 5 minutes).
[0073] The epoxy resin composition and container were immersed together in warm water at 32°C and the timer was started. The water temperature was maintained, and the curing time for the surface hardness of the epoxy resin composition to reach 70D Shore hardness was measured (the measurement interval was 0.5h).
[0074] The raw materials and dosages of the epoxy resin compositions tested in Examples 1-2 and Comparative Examples 1-3 are shown in Table 1.
[0075] Table 1. Mixing raw materials of epoxy resin compositions tested in Examples 1-2 and Comparative Examples 1-3
[0076]
[0077] The test results are shown in Table 2.
[0078] Table 2. Test results of epoxy resin modified permeable concrete obtained in Examples 1-2 and Comparative Examples 1-3
[0079]
[0080] Referring to Table 1,
[0081] Comparative Example 1 did not include diallyl phthalate as a curing compounding agent; in Examples 1 and 2, the epoxy resin modified permeable concrete of this application used 1,3-bis(aminomethyl)cyclohexane as an epoxy resin curing agent and diallyl phthalate as a curing compounding agent, and the curing time of the epoxy resin in the water environment in its epoxy resin modified permeable concrete was significantly longer than that of Comparative Example 1.
[0082] On the other hand, in Comparative Example 2, hexamethylenediamine was used as a curing agent and diallyl phthalate was used as a curing compound. In Comparative Example 3, hexamethylenediamine was used as a curing agent and diallyl phthalate was added as a curing compound. The curing time of epoxy resin in the epoxy resin modified permeable concrete of Comparative Examples 2 and 3 in the water environment was similar to that of Comparative Example 1, and no significant extension was observed.
[0083] Therefore, the use of 1,3-bis(aminomethyl)cyclohexane as an epoxy resin curing agent and diallyl phthalate as a curing compound to extend the curing time of epoxy resin in epoxy resin modified permeable concrete in this application is based on the interaction between the cycloalkane carbon ring of 1,3-bis(aminomethyl)cyclohexane and the benzene ring and ester bond sites in diallyl phthalate, and cannot be achieved by any curing agent and ester.
[0084] Meanwhile, the compressive strength and flexural strength of the epoxy resin modified permeable concrete obtained in Examples 1-2 are significantly improved compared with those in Comparative Examples 1-3. This verifies that the extended initial curing time of epoxy resin in the epoxy resin modified permeable concrete of this application promotes the effective early hydration reaction in the epoxy resin modified permeable concrete, thereby improving the strength enhancement effect brought about by the hydration reaction of the epoxy resin modified permeable concrete itself, improving the mechanical properties of the epoxy resin modified permeable concrete, and extending the service life of the pavement.
[0085] Example 3
[0086] An epoxy resin modified permeable concrete differs from Example 1 in that the raw materials also include 21 kg of TPU, which is powder with a particle size of 200±10 μm.
[0087] The preparation method of epoxy resin modified permeable concrete is as follows:
[0088] 1000 kg of cement, 1220 kg of sand, 500 kg of water, 138 kg of epoxy resin, 6.7 kg of 1,3-bis(aminomethyl)cyclohexane, 0.57 kg of diallyl terephthalate, and 21 kg of TPU are added to a mixer and mixed evenly to obtain a mixture. Then, aggregates are added to the mixture and mixed evenly to obtain epoxy resin modified permeable concrete.
[0089] Example 4
[0090] An epoxy resin modified permeable concrete differs from Example 1 in that the raw materials also include 14 kg of easily hydrolyzable polyester.
[0091] The easily hydrolyzable polyester was prepared in Example 1.
[0092] The preparation method of epoxy resin modified permeable concrete is as follows:
[0093] 1000 kg of cement, 1220 kg of sand, 500 kg of water, 138 kg of epoxy resin, 6.7 kg of 1,3-bis(aminomethyl)cyclohexane, 0.57 kg of diallyl terephthalate, and 14 kg of easily hydrolyzable polyester are added to a mixer and mixed evenly to obtain a mixture. Then, aggregates are added to the mixture and mixed evenly to obtain epoxy resin modified permeable concrete.
[0094] Example 5
[0095] An epoxy resin modified permeable concrete differs from Example 3 in that its preparation method is as follows:
[0096] 500 kg of water, 138 kg of epoxy resin, and 14 kg of easily hydrolyzable polyester were mixed evenly to obtain a gel material. 1000 kg of cement, 1220 kg of sand, 6.7 kg of 1,3-bis(aminomethyl)cyclohexane, and 0.57 kg of diallyl terephthalate were then mixed evenly with the gel material. After adding aggregate and mixing evenly, epoxy resin modified permeable concrete was obtained.
[0097] The epoxy resin modified permeable concrete obtained in Examples 3-5 was tested, and the test results are shown in Table 3 below.
[0098] Table 3. Test results of epoxy resin modified permeable concrete obtained in Examples 3-5
[0099]
[0100] Referring to Tables 2 and 3, TPU or the easily hydrolyzable polyester prepared in Example 1 was added in Examples 2 to 6 of this application. The flexural strength and compressive strength of the epoxy resin modified permeable concrete obtained were improved compared with Example 1. At the same time, the continuous porosity of Examples 3 to 6 was also increased, that is, the permeability of the epoxy resin modified permeable concrete in Examples 2 to 6 was improved.
[0101] The improvement in Examples 2-6 is due to the high-humidity heating environment created by the combined effects of the exothermic curing of epoxy resin, the heat of concrete hydration, and the aquatic environment during the curing process of epoxy resin-modified permeable concrete. Under this environment, TPU and easily hydrolyzable polyester undergo partial hydrolysis, causing cracks to appear on the TPU surface and dissolving the easily hydrolyzable polyester. This creates channels between the original location and the concrete material that allow water to pass through capillary penetration. After water seeps into these channels, it forms mass transfer and heat transfer channels in opposite directions. The water consumption is high in the area of intense hydration reaction, and it is replenished by the aqueous phase outside the area of intense hydration reaction to maintain the hydration reaction. The heat of hydration reaction is conducted outward through the water in the replenished channels, and the newly replenished water also acts as an external low-temperature medium, thus cooling the area of intense hydration reaction from two aspects. The heat conducted outward raises the temperature of the surrounding concrete, increases the activation energy of the hydration reaction, promotes the hydration reaction of the surrounding concrete, and triggers the hydrolysis of TPU within it, extending and diffusing the mass transfer and heat transfer channels.
[0102] This utilizes the heat of hydration of concrete itself to promote the hydrolysis of TPU and easily hydrolyzable polyester, forming mass transfer and heat transfer channels that are self-regulating with the heat of hydration of concrete. The more intense the hydration reaction in a region, the more it can promote the hydration reaction process of other surrounding concrete while simultaneously reducing the peak hydration heat in its own region. This allows epoxy resin modified permeable concrete to undergo more hydration reactions in its early stages under low peak hydration heat conditions without external intervention, thereby increasing the strength of epoxy resin modified permeable concrete. The mass transfer and heat transfer channels formed in this process can also improve the permeability of epoxy resin modified permeable concrete after it recovers from the heat of hydration.
[0103] Example 6
[0104] An epoxy resin modified permeable concrete differs from Example 1 in that it is obtained by mixing the following raw materials:
[0105] 1000kg cement, 1270kg aggregate, 1220kg sand, 500kg water, 138kg epoxy resin, 6.7kg 1,3-bis(aminomethyl)cyclohexane, 0.57kg diallyl terephthalate, 12kg TPU, and 10kg hydrolyzable polyester.
[0106] The easily hydrolyzable polyester was prepared in Example 1.
[0107] The preparation method of epoxy resin modified permeable concrete is as follows:
[0108] 500 kg of water, 138 kg of epoxy resin, and 10 kg of easily hydrolyzable polyester were mixed evenly to obtain a gel material. 1000 kg of cement, 1220 kg of sand, 6.7 kg of 1,3-bis(aminomethyl)cyclohexane, 0.57 kg of diallyl terephthalate, and 12 kg of TPU were then mixed evenly with the gel material. After adding aggregate and mixing evenly, epoxy resin modified permeable concrete was obtained.
[0109] The epoxy resin modified permeable concrete obtained in Example 6 was tested, and the test results are as follows:
[0110] Flexural strength – 20.07 MPa (7d), 28.38 MPa (28d);
[0111] Compressive strength – 6.29 MPa (7 days), 7.08 MPa (28 days);
[0112] Continuous porosity – 25.7%.
[0113] Compared with Examples 3-6, Example 6 has better compressive strength, flexural strength and continuous porosity than Examples 3-5. Therefore, when TPU and the easily hydrolyzable polyester of this application are added to the epoxy resin modified permeable concrete, the mechanical properties and permeability of the epoxy resin modified permeable concrete are improved.
[0114] On the other hand, there is a suitable range for the addition of TPU and easily hydrolyzable polyester in the epoxy resin modified permeable concrete of this application. Excessive TPU and easily hydrolyzable polyester will lead to excessive porosity and reduce the proportion of concrete materials, resulting in a decrease in the mechanical properties of epoxy resin modified permeable concrete. This has been studied, and some solutions are shown in Examples 7-12.
[0115] Examples 7-9
[0116] An epoxy resin modified permeable concrete differs from Example 3 in the amount of raw materials used, as detailed below:
[0117]
[0118]
[0119] Examples 10-12
[0120] An epoxy resin modified permeable concrete differs from Example 5 in the amount of raw materials used, as detailed below.
[0121] Unit / kg Example 10 Example 11 Example 12 cement 1000 1000 1000 aggregate 1270 1270 1270 sand 1220 1220 1220 cement 500 500 500 Epoxy resin 138 138 138 1,3-Bis(aminomethyl)cyclohexane 6.7 6.7 6.7 diallyl terephthalate 0.57 0.57 0.57 TPU 0 0 0 hydrolyzable polyester 2 7 30
[0122] The epoxy resin modified permeable concrete obtained in Examples 7 to 12 was tested, and the test results are shown in Table 4 below.
[0123] Table 4. Test results of epoxy resin modified permeable concrete obtained in Examples 7-12
[0124]
[0125] Referring to Tables 3 and 4, TPU was added in Examples 7-9, and the amount of TPU added gradually increased. The continuous porosity of Examples 7-9 increased with the increase of TPU addition, but the compressive strength and flexural strength of Examples 7-9 decreased significantly in Example 9, especially the early strength at 7 days, indicating that the amount of TPU used was excessive. Referring to Example 3, the TPU content in the epoxy resin modified permeable concrete of this application is preferably 8-21 kg when the cement content is 1000 kg.
[0126] In Examples 10-12, readily hydrolyzable polyester was added, and the amount of readily hydrolyzable polyester added gradually increased. The continuous porosity of Examples 10-12 increased with the increase in the amount of readily hydrolyzable polyester added. However, the compressive strength and flexural strength of Examples 7-9 showed a significant decrease in Example 9, especially the early strength at 7 days, indicating that the amount of readily hydrolyzable polyester was excessive. In conjunction with Example 3, the TPU content in the epoxy resin modified permeable concrete of this application is preferably 7-14 kg when the cement dosage is 1000 kg.
[0127] Examples 13-16
[0128] An epoxy resin modified permeable concrete differs from Example 6 in the amount of raw materials used, as detailed below:
[0129]
[0130] The epoxy resin modified permeable concrete obtained in Examples 13-16 was tested, and the test results are shown in Table 5 below.
[0131] Table 5. Test results of epoxy resin modified permeable concrete obtained in Examples 7-12
[0132]
[0133] Referring to Table 5, the epoxy resin modified permeable concrete obtained by adding TPU and easily hydrolyzable polyester in Examples 13-16 has similar flexural strength and compressive strength as that in Example 6, and the continuous porosity is also similar to that in Example 6. Therefore, when TPU and easily hydrolyzable polyester are added in combination within the range of raw material dosages used in Examples 6 and 13-16, the effect is better and will not reduce the mechanical strength of epoxy resin modified permeable concrete.
[0134] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of protection claimed by the present invention, they are protected by patent law.
Claims
1. An epoxy resin modified permeable concrete, characterized in that, It comprises the following parts by weight of raw materials: 100 parts cement; 120-130 parts of aggregate; the aggregate is machine-made aggregate, including coarse aggregate and fine aggregate, with coarse aggregate having a particle size of 20-25 mm and fine aggregate having a particle size of 8-15 mm; 110-127 parts sand; 45-53 parts water; 8.4~14.3 parts of epoxy resin; 0.5 to 0.71 parts of 1,3-bis(aminomethyl)cyclohexane; 0.04~0.066 parts of diallyl terephthalate; It also includes 0.8 to 1.3 parts TPU and 0.8 to 1.1 parts easily hydrolyzable polyester; The easily hydrolyzable polyester is obtained by polymerizing terephthalic acid, isophthalic acid and ethylene glycol, followed by polycondensation with polyethylene glycol; The preparation method of easily hydrolyzable esters is as follows: Terephthalic acid and isophthalic acid are mixed to obtain reactive acid A; Ethylene glycol and reactive acid A were added to an esterification vessel at a mass ratio of 1.71:1 and esterification was carried out under a catalyst until the esterification rate reached 89±1%, yielding the first esterified material. The first esterification material, polyethylene glycol, sodium 1,3-isophthalate dihydroxyethyl ester-5-sulfonate (SIPE), and stabilizer were mixed and subjected to a polycondensation reaction at 200°C. After the reaction was completed, an easily hydrolyzable polyester was obtained.
2. The method for preparing epoxy resin modified permeable concrete according to claim 1, characterized in that, Includes the following steps: Water, epoxy resin, and easily hydrolyzed polyester are mixed evenly, and then sand and cement are added to mix and obtain a gel material. The gel material is then mixed evenly with the remaining raw materials to obtain epoxy resin modified permeable concrete.