CN113004056A - Alkali-reducing treatment method for ecological concrete - Google Patents
Alkali-reducing treatment method for ecological concrete Download PDFInfo
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- CN113004056A CN113004056A CN202011519318.2A CN202011519318A CN113004056A CN 113004056 A CN113004056 A CN 113004056A CN 202011519318 A CN202011519318 A CN 202011519318A CN 113004056 A CN113004056 A CN 113004056A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/0018—Coating or impregnating "in situ", e.g. impregnating of artificial stone by subsequent melting of a compound added to the artificial stone composition
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Abstract
The invention relates to the technical field of ecological concrete treatment, in particular to an alkali-reducing treatment method of ecological concrete, which comprises the following steps of S1: carrying out periodic acid treatment on the molded ecological concrete, and drying for the first time after the last acid treatment; s2: dipping for 12-36h by using a dipping solution, and drying for the second time; s3: and (5) impregnating by using a sealant and drying for the third time. The alkali-reducing treatment method of the ecological concrete can effectively perform alkali transformation on the ecological concrete, so that the ecological concrete is more suitable for plant growth.
Description
Technical Field
The invention relates to the technical field of ecological concrete treatment, in particular to an alkali-reducing treatment method for ecological concrete.
Background
The ecological concrete, called vegetation concrete for short, can realize ecological planting while realizing safety protection, and is a novel slope protection material which can well combine engineering protection and ecological restoration.
The ecological concrete is prepared by mixing and pouring coarse aggregate, cement, water and an additive, and thin-layer cement slurry coated on the surface of the coarse aggregate is mutually bonded to form a honeycomb structure with uniformly distributed pores, so that a growth space can be provided for plants. The ecological concrete is filled with base materials such as soil, fertilizer, water-retaining agent and the like in pores, so that the root system of the plant can grow and extend in the ecological concrete, and nutrients can be obtained from the root system. However, as the base material filled in the pores is in direct contact with the gelled material layer, a large amount of alkaline substances released by the gelled material layer directly influence the pH value of the base material, so that the pH value in the pores of the ecological concrete can be as high as about 13, and the base material is not suitable for plant growth due to the high alkalinity. Therefore, the alkaline modification of the ecological concrete pore environment is the key to the smooth growth of plants in the ecological concrete pore environment.
In the prior art, ecological concrete is treated by a carbonization method, carbon dioxide gas in air can permeate into the ecological concrete through tiny pores and cracks on the surface of the concrete and interact with hydration products such as Ca (OH)2, C3S and C2S generated in the hydration process of cement to form calcium silicate, so that the chemical composition and the microstructure of the concrete are changed, and the content of alkaline substances in the concrete structure is reduced. However, the rapid carbonization process needs a rapid carbonization machine, the reaction temperature is high, the method is not suitable for mass production and practical engineering application, the carbonization process is long in time consumption, and the energy consumption is high.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an alkali-reducing treatment method for ecological concrete, which can effectively perform alkali transformation on the ecological concrete so as to make the ecological concrete more suitable for plant growth.
In order to achieve the technical effect, the invention adopts the following technical scheme:
an alkali-reducing treatment method for ecological concrete comprises the following steps:
s1: carrying out periodic acid treatment on the molded ecological concrete, and drying for the first time after the last acid treatment;
s2: dipping for 12-36h by using a dipping solution, and drying for the second time;
s3: and (5) impregnating by using a sealant and drying for the third time.
Further, the step S1 is to spray the ecological concrete alternately with water and an acid solution, and to control the temperature to be 30-50 ℃ during the spraying process.
Further, the ratio of the acidic solution for spraying to water is 1: 3-200.
Furthermore, the time interval of spraying by adopting the acid solution is 60-80h, and water is required to be sprayed until the ecological concrete is completely poured through before spraying by using the acid solution each time.
Further, the temperature of the first drying is 40-50 ℃.
Further, the impregnation liquid comprises the following components in parts by mass: 8-25 parts of tert-butoxy trimethylsilane, 3-10 parts of aminosilane coupling agent, 10-20 parts of colloidal silicon dioxide, 1-3 parts of zinc chloride, 1-2 parts of copper chloride, 2-4 parts of polyvinyl alcohol, 1-6 parts of sodium carboxymethyl cellulose, 5-10 parts of ammonium chloride and 50-500 parts of water.
Further, the preparation method of the impregnation liquid comprises the following steps:
(1): mixing 8-25 parts of tert-butoxy trimethylsilane, 3-10 parts of aminosilane coupling agent and 20-250 parts of water, and stirring for 30-60 min to obtain a mixed solution;
(2): adding 10-20 parts of colloidal silicon dioxide into the mixed solution in the step S1, and continuously stirring for 30-60 min to obtain a mixed solution A;
(3): mixing 30-250 parts of water, 1-3 parts of zinc chloride, 1-2 parts of copper chloride, 2-4 parts of polyvinyl alcohol and 1-6 parts of sodium carboxymethylcellulose, and continuously stirring for 50-80 min;
(4): adding 5-10 parts of ammonium chloride into the step (3), and stirring for 30-60 min to obtain a mixed solution B;
(5): adding the mixed solution B into the mixed solution A, and stirring for 60-120 min.
Further, the sealant is paraffin.
Further, the step S3 is specifically: and heating the paraffin to be in a liquid state, taking out the ecological concrete dried for the second time, immediately immersing the ecological concrete into the liquid paraffin until no bubbles emerge, and taking out the ecological concrete.
Further, the temperature of the second drying and the temperature of the third drying are both 60-65 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the impregnation liquid preparation method of the alkali-reducing treatment method of the ecological concrete is simple, easy to operate and low in construction cost; meanwhile, the ecological concrete treated by the ecological concrete alkali-reducing treatment method can keep the soil in a lower pH value for a longer time.
Detailed Description
The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
Example 1
The impregnation solution was prepared by the following method:
s1: mixing 8 parts of tert-butoxy trimethylsilane, 3 parts of aminosilane coupling agent and 30 parts of water, and stirring for 30min to obtain a mixed solution;
s2: adding 10 parts of colloidal silicon dioxide into the mixed solution obtained in the step S1, and continuously stirring for 30min to obtain a mixed solution A;
s3: mixing 80 parts of water, 1 part of zinc chloride, 1 part of copper chloride, 2 parts of polyvinyl alcohol and 1 part of sodium carboxymethyl cellulose, and continuously stirring for 50 min;
s4: adding 5 parts of ammonium chloride into the step S3, and stirring for 35min to obtain a mixed solution B;
s5: adding the mixed solution B into the mixed solution A, and stirring for 60min to obtain an impregnation solution A1.
Example 2
The impregnation solution was prepared by the following method:
s1: mixing 12 parts of tert-butoxy trimethylsilane, 4 parts of aminosilane coupling agent and 120 parts of water, and stirring for 40min to obtain a mixed solution;
s2: adding 13 parts of colloidal silicon dioxide into the mixed solution in the step S1, and continuously stirring for 40min to obtain a mixed solution A;
s3: mixing 60 parts of water, 1.4 parts of zinc chloride, 1.2 parts of copper chloride, 2.2 parts of polyvinyl alcohol and 4 parts of sodium carboxymethyl cellulose, and continuously stirring for 60 min;
s4: adding 6 parts of ammonium chloride into the step S3, and stirring for 35min to obtain a mixed solution B;
s5: adding the mixed solution B into the mixed solution A, and stirring for 80min to obtain an impregnation solution A2.
Example 3
The impregnation solution was prepared by the following method:
s1: taking 13 parts of tert-butoxy trimethylsilane, 6 parts of aminosilane coupling agent and 200 parts of water, mixing and stirring for 50min to obtain a mixed solution;
s2: adding 15 parts of colloidal silicon dioxide into the mixed solution in the step S1, and continuously stirring for 40min to obtain a mixed solution A;
s3: mixing 200 parts of water, 3 parts of zinc chloride, 2.5 parts of copper chloride, 4 parts of polyvinyl alcohol and 5 parts of sodium carboxymethyl cellulose, and continuously stirring for 70 min;
s4: adding 8 parts of ammonium chloride into the step S3, and stirring for 30min to obtain a mixed solution B;
s5: adding the mixed solution B into the mixed solution A, and stirring for 80min to obtain an impregnation solution A3.
Example 4
The impregnation solution was prepared by the following method:
s1: mixing 25 parts of tert-butoxy trimethylsilane, 10 parts of aminosilane coupling agent and 250 parts of water, and stirring for 60min to obtain a mixed solution;
s2: adding 20 parts of colloidal silicon dioxide into the mixed solution obtained in the step S1, and continuously stirring for 60min to obtain a mixed solution A;
s3: mixing 250 parts of water, 3 parts of zinc chloride, 2 parts of copper chloride, 4 parts of polyvinyl alcohol and 6 parts of sodium carboxymethyl cellulose, and continuously stirring for 80 min;
s4: adding 10 parts of ammonium chloride into the step (3), and stirring for 60min to obtain a mixed solution B;
s5: adding the mixed solution B into the mixed solution A, and stirring for 120min to obtain an impregnation solution A4.
Example 5
The impregnation liquids prepared in examples 1 to 4 are respectively used for treating ecological concrete, and the treatment method comprises the following steps:
preparing an ecological concrete test block by adopting ordinary portland cement, wherein the size of the test block is 180mm multiplied by 100mm, and taking out the test block after the ecological concrete is molded for 24 hours for the following treatment:
s1: alternately spraying water and an acid solution on the formed ecological concrete, controlling the temperature to be 30-50 ℃ in the spraying process, and adopting the ratio of the acid solution for spraying to water to be 1: 30-40, wherein the time interval of spraying with the acid solution is 70h, water is required to be sprayed until the ecological concrete is completely poured through before spraying with the acid solution, the ecological concrete is dried until no water drops, then the acid solution is used for spraying, and the acid solution for spraying is 3% oxalic acid solution.
S2: the impregnation liquids A1, A2, A3 and A4 prepared in examples 1 to 4 were respectively used for impregnation for 24 hours, and secondary drying was carried out at 60 ℃ for 12 hours.
S3: and heating the paraffin to a liquid state, taking out the ecological concrete dried for the second time, immediately immersing the ecological concrete into the liquid paraffin until no bubbles emerge, taking out the ecological concrete, drying for the third time at the temperature of 65 ℃, and controlling the temperature to be 62-65 ℃ to finally obtain the processed ecological concrete B1, B2, B3 and B4.
Example 6
Preparing an ecological concrete test block by adopting the same preparation method as the embodiment 5, alternately spraying the formed ecological concrete by using water and an acid solution, controlling the temperature to be 30-50 ℃ in the spraying process, and adopting the acid solution for spraying and the water in a ratio of 1: 30-40, wherein the time interval of spraying by adopting the acidic solution is 70h, before spraying by adopting the acidic solution, water is required to be sprayed until the ecological concrete is completely poured, and the ecological concrete is sprayed by adopting the acidic solution when the ecological concrete is dried to be free from dripping, and the acidic solution for spraying is an oxalic acid solution with the pH value of 2.5, so that the ecological concrete B5 is finally obtained.
Example 7
An ecological concrete test block is prepared by the same preparation method as the embodiment 5, and is taken out after the ecological concrete is formed for 24 hours and soaked for 12 hours by oxalic acid solution with the pH value of 2.5, and finally the ecological concrete B6 is obtained.
Example 8
Preparing an ecological concrete test block by adopting the same preparation method as that of the embodiment 5, taking out the ecological concrete after 24 hours of molding, directly drying the ecological concrete test block for 12 hours at 60 ℃, immediately immersing the ecological concrete test block into liquid paraffin after taking out until no bubbles emerge, drying the ecological concrete test block for the third time at 65 ℃, controlling the temperature to be 62-65 ℃, and finally obtaining the processed ecological concrete B7.
Example 9
An eco-concrete test block was prepared by the same preparation method as in example 5, and was taken out without any treatment after molding, and labeled B8, as a comparative example.
The ecological concrete finally obtained in the examples 5 to 9 is taken out for testing, and the method adopts a neat paste pH value test and comprises the following specific operation steps:
the ecological concrete obtained in the examples 5 to 9 is used for planting plants, the experimental plants are tall fescue, and the ecological concrete pore liquid is subjected to pH detection at 3d, 12d, 30d, 60d and 90d, and the experimental results are shown in the following table 1:
TABLE 1
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (10)
1. The alkali-reducing treatment method of the ecological concrete is characterized by comprising the following steps:
s1: carrying out periodic acid treatment on the molded ecological concrete, and drying for the first time after the last acid treatment;
s2: dipping for 12-36h by using a dipping solution, and drying for the second time;
s3: and (5) impregnating by using a sealant and drying for the third time.
2. The alkali-reducing treatment method of ecological concrete according to claim 1, characterized in that: s1 specifically comprises the steps of alternately spraying water and an acid solution on the ecological concrete, and controlling the temperature to be 30-50 ℃ in the spraying process.
3. The alkali-reducing treatment method of ecological concrete according to claim 2, characterized in that: the ratio of the acidic solution for spraying to water is 1: 3-200.
4. The alkali-reducing treatment method of ecological concrete according to claim 1, characterized in that: the time interval for spraying the acid solution is 60-80h, and the water is sprayed until the ecological concrete is completely poured through before the acid solution is sprayed each time.
5. The alkali-reducing treatment method of ecological concrete according to claim 1, characterized in that: the temperature of the first drying is 40-50 ℃.
6. The alkali-reducing treatment method of ecological concrete according to claim 1, wherein the impregnation liquid comprises the following components in parts by mass: 8-25 parts of tert-butoxy trimethylsilane, 3-10 parts of aminosilane coupling agent, 10-20 parts of colloidal silicon dioxide, 1-3 parts of zinc chloride, 1-2 parts of copper chloride, 2-4 parts of polyvinyl alcohol, 1-6 parts of sodium carboxymethyl cellulose, 5-10 parts of ammonium chloride and 50-500 parts of water.
7. The alkali-reducing treatment method of ecological concrete according to claim 6, wherein the preparation method of the impregnation liquid comprises the following steps:
(1): mixing 8-25 parts of tert-butoxy trimethylsilane, 3-10 parts of aminosilane coupling agent and 20-250 parts of water, and stirring for 30-60 min to obtain a mixed solution;
(2): adding 10-20 parts of colloidal silicon dioxide into the mixed solution in the step S1, and continuously stirring for 30-60 min to obtain a mixed solution A;
(3): mixing 30-250 parts of water, 1-3 parts of zinc chloride, 1-2 parts of copper chloride, 2-4 parts of polyvinyl alcohol and 1-6 parts of sodium carboxymethylcellulose, and continuously stirring for 50-80 min;
(4): adding 5-10 parts of ammonium chloride into the step (3), and stirring for 30-60 min to obtain a mixed solution B;
(5): adding the mixed solution B into the mixed solution A, and stirring for 60-120 min.
8. The alkali-reducing treatment method of ecological concrete according to claim 1, characterized in that: the sealant is paraffin.
9. The alkali-reducing treatment method for ecological concrete according to claim 1, wherein the S3 specifically comprises: and heating the paraffin to be in a liquid state, taking out the ecological concrete dried for the second time, immediately immersing the ecological concrete into the liquid paraffin until no bubbles emerge, and taking out the ecological concrete.
10. The alkali-reducing treatment method of ecological concrete according to claim 1, characterized in that: the temperature of the second drying and the temperature of the third drying are both 60-65 ℃.
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| CN202011519318.2A CN113004056A (en) | 2020-12-21 | 2020-12-21 | Alkali-reducing treatment method for ecological concrete |
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| CN202011519318.2A CN113004056A (en) | 2020-12-21 | 2020-12-21 | Alkali-reducing treatment method for ecological concrete |
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| US20170283293A1 (en) * | 2016-03-31 | 2017-10-05 | Korea Institute Of Geoscience And Mineral Resources (Kigam) | Method for recycling byproduct sludge in recycled aggregate producing process from waste concrete |
| CN108623269A (en) * | 2018-05-30 | 2018-10-09 | 大连圣多教育咨询有限公司 | A kind of concrete for plant growth and preparation method thereof |
| CN109400208A (en) * | 2018-11-02 | 2019-03-01 | 华南农业大学 | A kind of drop alkali treatment method of eco-concrete |
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2020
- 2020-12-21 CN CN202011519318.2A patent/CN113004056A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170283293A1 (en) * | 2016-03-31 | 2017-10-05 | Korea Institute Of Geoscience And Mineral Resources (Kigam) | Method for recycling byproduct sludge in recycled aggregate producing process from waste concrete |
| CN108623269A (en) * | 2018-05-30 | 2018-10-09 | 大连圣多教育咨询有限公司 | A kind of concrete for plant growth and preparation method thereof |
| CN109400208A (en) * | 2018-11-02 | 2019-03-01 | 华南农业大学 | A kind of drop alkali treatment method of eco-concrete |
Non-Patent Citations (1)
| Title |
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| 杨永民: "《多孔生态混凝土孔隙水环境碱性降低措施研究》", 《广东水利水电》 * |
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Application publication date: 20210622 |