Concrete internal and external synergistic curing material, preparation method and curing method

Abstract

The invention discloses a concrete internal and external synergistic curing material, a preparation method and a curing method. The internal curing material comprises the following components in parts by weight: 5-20 parts of microbial flora, 20-50 parts of a carbon source, 5-50 parts of a calcium source, 5-20 parts of a nitrogen source and 1-10 parts of inorganic salt. The external curing material comprises the following components in parts by weight: 10-30 parts of water-soluble polyvinyl alcohol, 5-15 parts of a cross-linking agent, 5-30 parts of a phase change material, 5-20 parts of a barrier material, 10-30 parts of a water retention material and 50-300 parts of water. The internal curing material is doped inside the concrete, and the external curing material is impregnated or sprayed outside the concrete, so that the internal curing material and the external curing material have a synergistic effect on the concrete, and the concrete has the advantages of obvious curing effect, good compressive strength, permeability resistance, temperature control performance and water retention performance, avoidance of shrinkage cracking caused by humidity or temperature difference, and good comprehensive performance. And the mechanical and durability of the concrete are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete curing, and more specifically, to a concrete internal and external coordinated curing material, a preparation method and a curing method. Background Art

[0002] Concrete components formed by 3D printing are large and complex in structure. Since this type of concrete slurry has low fluidity and cannot be effectively vibrated, pores remain inside the concrete components, which seriously affects the density and mechanical strength of the finished product. In addition, it is difficult to obtain comprehensive and continuous maintenance and control of hardened concrete components, especially in seasons and regional environments with large temperature and humidity differences, and outdoor maintenance is particularly prominent. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects of the prior art and to provide a concrete internal and external collaborative curing material, a preparation method and a curing method. Through the synergistic effect of internal and external curing materials, the compressive strength and permeability resistance of the cured concrete are significantly improved, and the temperature control performance and water retention performance are good, thus avoiding shrinkage cracking caused by humidity or temperature differences, and enhancing the mechanical and durability properties of the concrete.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A concrete internal and external collaborative curing material comprises an internal curing material and an external curing material; the internal curing material comprises the following components in parts by weight: 5-20 parts of microorganisms, 20-50 parts of carbon sources, 5-50 parts of calcium sources, 5-20 parts of nitrogen sources and 1-10 parts of inorganic salts; the external curing material comprises the following components in parts by weight: 10-30 parts of water-soluble polyvinyl alcohol, 5-15 parts of cross-linking agents, 5-30 parts of phase change materials, 5-20 parts of barrier materials, 10-30 parts of water-retaining materials and 50-300 parts of water.

[0006] Optionally, the microorganisms include at least one of bacteria and fungi.

[0007] Optionally, the bacteria include at least one of Bacillus and Streptococcus.

[0008] Optionally, the fungus includes at least one of Aspergillus and Penicillium.

[0009] Optionally, the Bacillus includes at least one of aerobic Bacillus, anaerobic Bacillus and facultative anaerobic Bacillus.

[0010] Optionally, the carbon source includes at least one of cellulose powder, starch, glucose, straw, and corn flour.

[0011] Optionally, the calcium source includes at least one of calcium lactate, calcium alginate and calcium gluconate.

[0012] Optionally, the nitrogen source includes at least one of urea, dry manure, protein powder, bean dregs, and cake powder.

[0013] Optionally, the inorganic salt includes at least one of potassium dihydrogen phosphate, calcium chloride, wood ash, shell powder, fly ash, and ammonium nitrate.

[0014] Optionally, the phase change material includes at least one of alkanes, polyethylene glycol, paraffin, and lithium sulfate.

[0015] Optionally, the barrier material includes at least one of fly ash beads, aerogel, attapulgite, and EPS particles.

[0016] Optionally, the water-retaining material includes at least one of glycerol, polyacrylamide, sodium polyacrylate, starch, cellulose, and alginate.

[0017] Optionally, the cross-linking agent includes at least one of an aqueous solution of boric acid, aluminum sulfate, glutaraldehyde, and tannic acid.

[0018] The present invention also discloses a method for preparing the above-mentioned concrete internal and external coordinated curing material, comprising the following steps:

[0019] Mixing microorganisms, a carbon source, a calcium source, a nitrogen source and an inorganic salt to obtain the internal curing material;

[0020] The water-soluble polyvinyl alcohol, the cross-linking agent, the phase change material, the barrier material, the water-retaining material and water are mixed to obtain the external curing material.

[0021] The invention also discloses a curing method for internal and external coordinated curing concrete, which uses the above-mentioned concrete internal and external coordinated curing material.

[0022] Furthermore, the maintenance method comprises the following steps:

[0023] Adding the internal curing material to the concrete slurry to obtain an intermediate material; wherein the internal curing material accounts for 5-40 parts of the intermediate material;

[0024] The external curing material is loaded on the surface of the intermediate material by impregnation or coating to form a hydrogel film on the outside of the intermediate material to obtain the concrete.

[0025] Optionally, the immersion parameters are: starting the timer for 10 to 60 seconds after the shaped component is immersed in the solution, and heating and vibration assistance.

[0026] Optionally, the hydrogel film has a thickness of 0.1 to 20 mm.

[0027] Implementing the embodiments of the present invention will have the following beneficial effects:

[0028] The present invention effectively promotes the hydration process of concrete and the generation of products by introducing a microbial internal curing system into the internal curing material, and can self-repair the voids in the concrete, thereby achieving good density and stable performance.

[0029] In order to further cure concrete, the present invention provides an external curing material on the basis of adopting an internal curing material. A layer of hydrogel film is formed on the surface of concrete by direct impregnation or coating, which plays a role in regulating temperature and humidity. During the service period, it can block the concrete structure from the external environment, play a protective role, and significantly improve the durability of the concrete structure. At the same time, polyvinyl alcohol-boric acid is a reversible hydrogel, which is reduced to a gel state when heated for repeated use.

[0030] The present invention achieves a synergistic effect on concrete by adding internal curing materials inside the concrete and dipping or spraying external curing materials outside the concrete. The curing effect is obvious, and the material has excellent compressive strength, anti-permeability, temperature control performance and water retention performance, avoiding shrinkage cracking caused by humidity or temperature differences, and enhancing the mechanical and durability properties of concrete.

[0031] The concrete internal and external collaborative curing material provided by the present invention selects suitable components of the internal curing material and the external curing material, and optimizes the addition amounts of the components, so that the prepared concrete internal curing agent can take into account the temperature and humidity control performance and improve the compressive strength of the concrete. At the same time, the preparation process is simple, and the raw materials are inexpensive and widely available, without harm to the environment. It has the advantages of better environmental protection, safety, long-term effectiveness, wide application range and economy, and has high application prospects and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of curing concrete according to an embodiment of the present invention.

[0033] Figure 2 It is a comparison chart of the compressive performance test of the cured concrete of the embodiment of the present invention and the comparative example.

[0034] Figure 3 It is a comparison chart of the anti-penetration performance test of the cured concrete of the embodiment of the present invention and the comparative example.

[0035] Figure 4 It is a comparison chart of the temperature control performance test of the curing concrete of the embodiment of the present invention and the comparative example.

[0036] Figure 5 It is a comparison chart of the moisture retention performance test of the cured concrete of the embodiment of the present invention and the comparative example. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with specific embodiments, but the present invention is not limited in any way.

[0038] Example 1

[0039] The concrete internal and external collaborative curing materials of this embodiment include internal curing materials and external curing materials; wherein, the internal curing materials include the following components in parts by weight: 6 parts of facultative anaerobic Bacillus, 20 parts of cellulose powder, 10 parts of calcium lactate, 5 parts of urea and 1 part of potassium dihydrogen phosphate; the external curing materials include the following components in parts by weight: 10 parts of water-soluble polyvinyl alcohol, 5 parts of boric acid aqueous solution, 5 parts of alkane, 5 parts of fly ash floating beads, 10 parts of sodium polyacrylate and 100 parts of water.

[0040] The preparation method of the concrete internal and external coordinated curing material of this embodiment comprises the following steps:

[0041] The facultative anaerobic bacillus, a carbon source, a calcium source, a nitrogen source and an inorganic salt are mixed to obtain an internal curing material; and the water-soluble polyvinyl alcohol, a boric acid aqueous solution, a phase change material, a barrier material, a water-retaining material and water are mixed to obtain an external curing material.

[0042] Example 2

[0043] The concrete internal and external collaborative curing materials of this embodiment include internal curing materials and external curing materials; wherein, the internal curing materials include the following components in parts by weight: 5 parts of facultative anaerobic Bacillus, 10 parts of cellulose powder, 6 parts of calcium lactate, 6 parts of urea and 1 part of potassium dihydrogen phosphate; the external curing materials include the following components in parts by weight: 20 parts of water-soluble polyvinyl alcohol, 5 parts of boric acid aqueous solution, 5 parts of alkane, 5 parts of fly ash floating beads, 10 parts of sodium polyacrylate and 50 parts of water.

[0044] Example 3

[0045] The concrete internal and external collaborative curing materials of this embodiment include internal curing materials and external curing materials; wherein, the internal curing materials include the following components in parts by weight: 6 parts of facultative anaerobic Bacillus, 20 parts of starch, 10 parts of calcium alginate, 5 parts of dry manure and 1 part of wood ash; the external curing materials include the following components in parts by weight: 10 parts of water-soluble polyvinyl alcohol, 5 parts of boric acid aqueous solution, 5 parts of alkane, 5 parts of fly ash floating beads, 10 parts of sodium polyacrylate and 100 parts of water.

[0046] Example 4

[0047] The difference between this embodiment and embodiment 1 is that the facultative anaerobic Bacillus is replaced by anaerobic Bacillus.

[0048] Example 5

[0049] The difference between this embodiment and embodiment 1 is that the facultative anaerobic Bacillus is replaced by aerobic Bacillus.

[0050] Example 6

[0051] The difference between this embodiment and embodiment 1 is that the internal curing material includes 5 parts of aerobic Bacillus and 1 part of anaerobic Bacillus.

[0052] Example 7

[0053] The difference between this embodiment and embodiment 1 is that the internal curing material includes 1 part of aerobic Bacillus and 5 parts of facultative anaerobic Bacillus.

[0054] Example 8

[0055] The difference between this embodiment and embodiment 1 is that the internal curing material includes 3 parts of anaerobic Bacillus and 3 parts of facultative anaerobic Bacillus.

[0056] Example 9

[0057] The difference between this embodiment and embodiment 1 is that the facultative anaerobic Bacillus is replaced by Streptococcus.

[0058] Example 10

[0059] The difference between this embodiment and embodiment 1 is that the microorganisms in the internal curing material are 3 parts of facultative anaerobic Bacillus and 3 parts of Streptococcus.

[0060] Embodiment 11

[0061] The difference between this embodiment and embodiment 1 is that the facultative anaerobic Bacillus is replaced by Aspergillus.

[0062] Example 12

[0063] The only difference between this embodiment and embodiment 1 is that the microorganisms in the internal curing material are 3 parts of facultative anaerobic Bacillus and 3 parts of Aspergillus.

[0064] Embodiment 13

[0065] The difference between this embodiment and embodiment 1 is that the facultative anaerobic Bacillus is replaced by Penicillium.

[0066] Embodiment 14

[0067] The difference between this embodiment and embodiment 1 is that the microorganisms in the internal curing material are 3 parts of facultative anaerobic Bacillus and 3 parts of Penicillium.

[0068] Embodiment 15

[0069] The only difference between this embodiment and embodiment 1 is that the microorganisms in the internal curing material are 2 parts of aerobic Bacillus, 2 parts of anaerobic Bacillus and 2 parts of facultative anaerobic Bacillus.

[0070] Example 16

[0071] The only difference between this embodiment and embodiment 1 is that the microorganisms in the internal curing material are 1 part of aerobic Bacillus, 1 part of anaerobic Bacillus, 2 parts of facultative anaerobic Bacillus, and 2 parts of Aspergillus.

[0072] Comparative Example 1

[0073] This comparative example only used concrete that had not been cured.

[0074] Comparative Example 2

[0075] The only difference between this comparative example and Example 1 is that only internal curing is performed on the concrete.

[0076] Embodiment 17

[0077] The curing material prepared by Examples 1-16 and Comparative Examples 1-7 is used to cure concrete, comprising the following steps: adding an internal curing material to the concrete slurry to obtain an intermediate material and solidifying it into a fixed shape; wherein the internal curing material accounts for 0.1% of the intermediate material; and coating the external curing material on the surface of the intermediate material to form a hydrogel film with a thickness of 1 mm on the outside of the intermediate material to obtain concrete.

[0078] Embodiment 18

[0079] The curing material prepared by Examples 1-16 and Comparative Examples 1-7 is used to cure concrete, comprising the following steps: adding an internal curing material to a concrete slurry to obtain an intermediate material; wherein the internal curing material accounts for 0.1% of the intermediate material; the external curing material is immersed (heated at 60°C and ultrasonically vibrated for 20s) or directly sprayed (50°C), and then a cross-linking agent such as a boric acid aqueous solution is sprayed on the surface of the intermediate material to form a hydrogel film with a thickness of 5 mm on the outside of the intermediate material to obtain concrete.

[0080] Test Case

[0081] The concrete obtained by curing in Example 17 was subjected to performance evaluation and testing, and the concrete mechanical properties, anti-permeability, temperature control performance and water retention performance were tested. The test results are shown in Figure 2-Figure 5 .

[0082] The test method for long-term performance and durability of concrete refers to the standard GB / T50082-2024

[0083] From the above test results, it can be seen that the concrete obtained by curing in the embodiment has significantly excellent compressive strength, anti-permeability, temperature control performance and water retention performance, which shows that the optimized conditions in the embodiment can overcome the shortcomings of the comparative example. The effects achieved by the ecological and environmentally friendly artificial fish reefs prepared in Examples 2-16 are the same as those in Example 1.

[0084] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A concrete internal and external collaborative curing material, characterized in that: Including internal curing materials and external curing materials; The internal curing material comprises the following components in parts by weight: 5-20 parts of microorganisms, 20-50 parts of carbon sources, 5-50 parts of calcium sources, 5-20 parts of nitrogen sources and 1-10 parts of inorganic salts; The external curing material comprises the following components in parts by weight: 10-30 parts of water-soluble polyvinyl alcohol, 5-15 parts of a cross-linking agent, 5-30 parts of a phase change material, 5-20 parts of a barrier material, 10-30 parts of a water-retaining material and 50-300 parts of water.

2. The concrete internal and external collaborative curing material according to claim 1, characterized in that: The microorganisms include at least one of bacteria and fungi; The bacteria include at least one of Bacillus and Streptococcus; The fungus includes at least one of Aspergillus and Penicillium.

3. The concrete internal and external collaborative curing material according to claim 2, characterized in that: The bacillus includes at least one of aerobic bacillus, anaerobic bacillus and facultative anaerobic bacillus.

4. The concrete internal and external coordinated curing material according to claim 1, characterized in that: The carbon source includes at least one of cellulose powder, starch, glucose, straw, and corn flour; The calcium source includes at least one of calcium lactate, calcium alginate and calcium gluconate; The nitrogen source includes at least one of urea, dry manure, protein powder, bean dregs, and cake powder; The inorganic salt includes at least one of potassium dihydrogen phosphate, calcium chloride, wood ash, shell powder, fly ash, and ammonium nitrate.

5. The concrete internal and external coordinated curing material according to claim 1, characterized in that: The phase change material includes at least one of alkanes, polyethylene glycol, paraffin, and lithium sulfate; The barrier material includes at least one of fly ash floating beads, aerogel, attapulgite, alumina, and EPS particles; The water-retaining material comprises at least one of glycerol, polyacrylamide, polyacrylic acid salt, starch, cellulose and alginate; The cross-linking agent includes at least one of boric acid, aluminum sulfate, glutaraldehyde and tannic acid.

6. A method for preparing the concrete internal and external coordinated curing material according to any one of claims 1 to 5, characterized in that: The following steps are involved: Mixing microorganisms, a carbon source, a calcium source, a nitrogen source and an inorganic salt to obtain the internal curing material; The water-soluble polyvinyl alcohol, the cross-linking agent, the phase change material, the barrier material, the water-retaining material and water are mixed to obtain the external curing material.

7. A curing method for internal and external coordinated curing of concrete, characterized in that: Use the concrete internal and external collaborative curing material as described in any one of claims 1 to 5; The maintenance method comprises the following steps: Adding the internal curing material to the concrete slurry to obtain an intermediate material; wherein the internal curing material accounts for 5-40 parts of the intermediate material; The external curing material is loaded on the surface of the intermediate material by impregnation or coating to form a hydrogel film on the outside of the intermediate material to obtain the concrete.

8. The curing method of concrete by coordinated curing of inside and outside according to claim 7 is characterized in that: The parameters of the immersion are as follows: a timer of 10 to 60 seconds is started after the shaped component is immersed in the solution, and heating and vibration assistance are provided.

9. The curing method of concrete by coordinated curing of inside and outside according to claim 7, characterized in that: The thickness of the hydrogel film is 0.1-10 mm.

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