Method for ensuring humidity of concrete structure in curing stage

Abstract

The invention relates to a method for ensuring the humidity of a concrete structure in a curing stage, which comprises the following steps: (1) preparing a saturated salt solution, then adding a gelling agent, uniformly stirring, and standing to obtain saturated salt solution gel; (2) the concrete surface is subjected to preliminary cleaning, ultrasonic cleaning and high-pressure water washing, and then the cleaned concrete surface is subjected to drying treatment and wetting treatment; and (3) uniformly coating the saturated salt solution gel on the surface of the concrete, and finally performing maintenance management. According to the invention, a proper humidity environment can be effectively maintained in a concrete structure curing stage, early-stage dry shrinkage and cracks of concrete are prevented, the strength and durability of concrete are improved, the curing process is simplified, the curing cost is reduced, and good market application prospects are achieved.

Description

Technical Field

[0001] The invention belongs to the field of building engineering construction, and in particular relates to a method for ensuring the humidity of a concrete structure during a curing stage. Background Art

[0002] As the main material in construction and civil engineering, the performance of concrete depends largely on humidity control during the curing stage. Existing curing methods such as water spraying, covering with moisturizing materials and applying curing agents have their own shortcomings: water spraying consumes a lot of water resources and manpower and is not effective in dry environments; covering with moisturizing materials is limited by the air permeability and water absorption capacity of the materials, which is prone to uneven coverage and increases construction complexity and cost; applying curing agents requires professional equipment and technology, and may cause pollution to the environment, and improper use affects the performance of concrete. Therefore, the existing technology urgently needs a more efficient, simple and environmentally friendly concrete curing method to ensure a suitable humidity environment and improve the strength and durability of concrete. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for ensuring the humidity of a concrete structure during the curing stage, which can effectively maintain a suitable humidity environment during the curing stage of the concrete structure, prevent early shrinkage and cracking of the concrete, improve the strength and durability of the concrete, simplify the curing process, and reduce the curing cost.

[0004] The present invention provides a method for ensuring the humidity of a concrete structure during the curing stage, comprising the following steps:

[0005] (1) preparing a saturated salt solution, then adding a gelling agent, stirring evenly, and standing to obtain a saturated salt solution gel;

[0006] (2) Preliminary cleaning, ultrasonic cleaning, and high-pressure water washing of the concrete surface, followed by drying and wetting of the cleaned concrete surface;

[0007] (3) Apply the saturated salt solution gel evenly on the concrete surface and then carry out maintenance.

[0008] Preferably, the salt in step (1) is a nitrate or a chloride.

[0009] Preferably, the gelling agent in step (1) is polyvinyl alcohol or carbomer.

[0010] Preferably, the mass ratio of the saturated salt solution to the gelling agent in step (1) is 5-10:1.

[0011] Preferably, the standing time in step (1) is 8-12 hours.

[0012] Preferably, the drying process in step (2) ensures that there is no excess moisture on the surface of the concrete.

[0013] Preferably, the wetting treatment in step (2) ensures that the concrete surface remains wet.

[0014] Preferably, the thickness of the saturated salt solution gel in step (3) is 1 mm to 2 mm.

[0015] Beneficial Effects

[0016] Compared with the existing concrete curing method, the present invention uses the gel material of saturated salt solution to cure concrete, which has the following advantages and positive effects:

[0017] (1) Effectively maintaining humidity: The present invention forms a humidity protection layer by coating a saturated salt solution gel on the surface of concrete, which can effectively maintain a suitable humidity environment during the curing stage and prevent the early shrinkage and cracking of concrete.

[0018] (2) Improving concrete strength and durability: A continuously moist environment helps the concrete hydration reaction to proceed fully, significantly improving the strength and durability of concrete and ensuring its stability and reliability in long-term use.

[0019] (3) Simplified maintenance operation: Traditional maintenance methods such as sprinkling water and covering with plastic film are complicated and time-consuming. The method of the present invention is easy to operate and only requires evenly coating the gel on the concrete surface, which reduces manual and mechanical operations and reduces the difficulty of operation.

[0020] (4) Reduce maintenance costs: By using saturated salt solution gel instead of traditional maintenance materials and methods, water waste and labor costs can be reduced. In addition, the reusability and long-term effectiveness of the gel also reduce the overall maintenance cost.

[0021] (5) Environmentally friendly: The saturated salt solution and gelling agent used in the present invention are both environmentally friendly materials, which are environmentally friendly, will not generate harmful waste, and meet the requirements of green buildings.

[0022] (6) Strong applicability: This method is applicable to concrete projects of various types and sizes, including bridges, tunnels, buildings, etc. It is not restricted by climate and environment and has broad application prospects.

[0023] (7) Strong controllability: By adjusting the formula and coating thickness of the gel, the curing effect can be flexibly controlled to meet the specific needs of concrete curing in different projects.

[0024] (8) Reduce deformation and cracking risks: After the gel layer forms a protective layer on the surface, it can effectively reduce the deformation and cracking risks of concrete caused by humidity changes.

[0025] In summary, the present invention provides a simple, efficient, low-cost and environmentally friendly concrete curing method, which has significant advantages and positive effects in improving the quality and service life of concrete, can effectively make up for the shortcomings of the existing technology, and has broad application prospects and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0028] The present invention provides a method for ensuring the humidity of a concrete structure during the curing stage, comprising the following steps:

[0029] Step 1: Select salts and prepare solutions: Select appropriate salts (such as nitrates, chlorides, etc.), dissolve the salts at a suitable temperature (such as 40°C to 50°C) until the solution reaches saturation to obtain a saturated salt solution.

[0030] Step 2: Select gelling agent and mix: Select a suitable gelling agent (such as polyvinyl alcohol, carbomer, etc.) and add it to the saturated salt solution in proportion. Stir evenly to form a saturated salt solution gel with high viscosity. The mixing ratio is generally 10:1 to 5:1 by mass of saturated salt solution and gelling agent, and the specific ratio can be adjusted according to actual needs.

[0031] Step 3: Let the mixed solution stand for a certain period of time (such as 8 to 12 hours) at room temperature to allow it to completely form a gel. The improvement lies in ensuring the quality and uniformity of gel formation by controlling the standing time. Traditional maintenance methods often use methods such as covering with plastic film, watering, or using wet linen to keep concrete moist; the present invention uses a saturated salt solution mixed with a gelling agent to form a gel, providing a long-lasting and uniform moist environment, avoiding the problem of rapid water loss and frequent watering in traditional methods.

[0032] Step 4: Preliminary surface cleaning: Use a high-pressure water gun or mechanical brush to perform preliminary cleaning on the concrete surface to remove dust, oil stains and loose particles.

[0033] Step 5: Ultrasonic cleaning: Ultrasonic cleaning of the concrete surface, combined with chemical cleaning agents, can further remove surface impurities.

[0034] Step 6: High-pressure water washing: Use high-pressure water to wash the ultrasonically cleaned concrete surface to ensure that the cleaning agent residue is completely removed. The improvement of this step is the use of high-pressure water washing to ensure that the surface is thoroughly clean. Currently commonly used methods include simple washing or wiping, the main purpose of which is to remove dust and impurities on the surface. The present invention can more thoroughly remove surface impurities and ensure the adhesion effect of the gel by introducing high-pressure water guns and mechanical brush cleaning technology, combined with ultrasonic cleaning technology and chemical cleaning agents.

[0035] Step 7: Surface drying: Use hot air drying technology to dry the cleaned concrete surface to ensure that there is no excess moisture on the surface but maintain a certain humidity. The improvement of this step is to control the degree of drying, avoid complete drying, and ensure that the surface is suitable for coating gel.

[0036] Step 8: Surface wetting treatment: Before applying the gel, properly wet the concrete surface to keep it moist but without obvious water marks.

[0037] Step 9: Check before coating: Before applying the gel, check whether the concrete surface is flat and clean to ensure the gel coating effect. The improvement of this step is to ensure that the surface condition is suitable for coating through inspection.

[0038] Step 10: Apply gel: Use a brush, roller or sprayer to evenly apply the saturated salt solution gel on the concrete surface. The coating thickness should be uniform, generally controlled at 1-2 mm. The improvement lies in the use of a variety of coating tools to ensure uniform operation and avoid missing coating and excessive thickness. Currently, the method of covering with plastic film or wet linen is often used in the construction process, and regular watering is required to keep it moist. The present invention ensures that the gel layer is evenly and durably covered on the concrete surface by using a gel coating method, avoiding the problems of uneven coverage and frequent maintenance in traditional methods.

[0039] Step 11: Protection after coating: After coating, external impact and wiping should be avoided to ensure the integrity of the gel layer. The improvement lies in taking protective measures to ensure that the gel layer after coating is not damaged.

[0040] Step 12: Maintenance management: After applying the gel, check the state of the gel layer on the concrete surface every day to ensure that it remains moist; additional coating can be performed if necessary according to changes in ambient humidity and temperature. The improvement lies in ensuring that the maintenance effect is long-lasting and stable through regular inspection and replenishment. Current technology generally uses frequent watering or covering with wet linen to ensure that the concrete surface remains moist. The present invention ensures that the concrete surface remains moist by regularly inspecting and replenishing the gel, effectively avoiding the problems of water loss and surface drying caused by frequent operations in traditional methods.

[0041] Step 13: Environmental monitoring: During the maintenance period, monitor the environmental humidity and temperature in real time, adjust the maintenance measures, and ensure the effectiveness of the gel layer. The improvement of this step lies in the application of environmental monitoring technology to improve the scientific nature of maintenance management.

[0042] Step 14: Post-treatment: After the concrete reaches the predetermined curing period (such as 7 days or 28 days), remove the gel layer as needed, or allow it to weather and fall off naturally. The improvement of this step is to combine water flushing or mechanical cleaning methods to improve the efficiency and effect of post-treatment. The current technology requires the removal of the covering after the concrete reaches a predetermined strength, and surface finishing may be required. The present invention uses the natural weathering of the gel layer or combines water flushing and mechanical cleaning methods to remove the gel layer conveniently and quickly, ensuring that the surface quality of the concrete is not affected, and simplifying the post-treatment process.

[0043] Step 15: Surface quality inspection: After post-processing, the concrete surface quality inspection is carried out to ensure that the concrete surface quality and performance are not affected. The improvement of this step is to ensure the curing effect and the quality of the concrete surface through strict quality inspection.

[0044] Example 1

[0045] like Figure 1 As shown, this embodiment proposes a method for ensuring the humidity of a concrete structure during the curing stage based on a saturated salt solution gel, using potassium nitrate as a salt and polyvinyl alcohol as a gelling agent, including the following steps:

[0046] Step 1: Select salt and prepare solution: Select potassium nitrate as the salt and dissolve potassium nitrate at 45°C until the solution reaches saturation.

[0047] Step 2: Select gelling agent and mix: Select polyvinyl alcohol as gelling agent, add it to saturated potassium nitrate solution in proportion, stir evenly, and form a saturated salt solution gel with high viscosity. The mixing ratio is 8:1 by mass ratio of salt solution to gelling agent. Step 3: Let stand to form gel: Let the mixed solution stand at room temperature for 10 hours to completely form gel.

[0048] Step 4: Preliminary surface cleaning: Use a high-pressure water gun to perform preliminary cleaning on the concrete surface to remove dust, oil stains and loose particles.

[0049] Step 5: Ultrasonic cleaning: Ultrasonic cleaning of the concrete surface, combined with chemical cleaning agents, can further remove surface impurities.

[0050] Step 6: High-pressure water washing: Use high-pressure water to rinse the ultrasonically cleaned concrete surface to ensure that the cleaning agent residue is completely removed.

[0051] Step 7: Surface drying: Use hot air drying technology to dry the cleaned concrete surface to ensure that there is no excess moisture on the surface but maintain a certain humidity.

[0052] Step 8: Surface wetting treatment: Before applying the gel, properly wet the concrete surface to keep it moist but without obvious water marks.

[0053] Step 9: Check before coating: Before applying the gel, check whether the concrete surface is flat and clean to ensure the gel coating effect.

[0054] Step 10: Apply gel: Use a brush to evenly apply the saturated potassium nitrate solution gel on the concrete surface. The coating thickness is controlled at 1.5 mm.

[0055] Step 11: Protection after coating: After coating, external impact and wiping should be avoided to ensure the integrity of the gel layer.

[0056] Step 12: Maintenance and management: After applying the gel, check the state of the gel layer on the concrete surface every day to ensure that it remains moist; apply additional coating if necessary based on changes in ambient humidity and temperature.

[0057] Step 13: Environmental monitoring: During the curing period, monitor the environmental humidity and temperature in real time and adjust the curing measures to ensure the effectiveness of the gel layer.

[0058] Step 14: Post-treatment: After the concrete reaches the predetermined curing period (28 days), the gel layer is removed by high-pressure water washing to ensure that the surface quality of the concrete is not affected.

[0059] Step 15: Surface quality inspection: After post-processing, the concrete surface quality inspection is carried out to ensure that the concrete surface quality and performance are not affected.

[0060] Each step in this embodiment verifies the advantages of the present invention by selecting appropriate materials and process conditions, that is, by using a saturated salt solution and a gelling agent to form a gel, a durable and uniform moist environment is provided, thereby avoiding the problems of rapid water loss and frequent watering in traditional methods, and at the same time, the operation is simplified in post-processing and the efficiency is improved.

[0061] Example 2

[0062] like Figure 1 As shown, this embodiment proposes a method for ensuring the humidity of a concrete structure during the curing stage based on a saturated salt solution gel, using calcium nitrate as a salt and polyvinyl alcohol as a gelling agent, including the following steps:

[0063] Step 1: Select salt and prepare solution: Select calcium nitrate as the salt and dissolve calcium nitrate at 40°C until the solution reaches saturation.

[0064] Step 2: Select gelling agent and mix: Select polyvinyl alcohol as gelling agent, add it to saturated calcium nitrate solution in proportion, stir evenly, and form a saturated salt solution gel with high viscosity. The mixing ratio is 6:1 by mass ratio of salt solution to gelling agent. Step 3: Let stand to form gel: Let the mixed solution stand at room temperature for 10 hours to completely form gel.

[0065] Step 4: Preliminary surface cleaning: Use a high-pressure water gun to perform preliminary cleaning on the concrete surface to remove dust, oil stains and loose particles.

[0066] Step 5: Ultrasonic cleaning: Ultrasonic cleaning of the concrete surface, combined with chemical cleaning agents, can further remove surface impurities.

[0067] Step 6: High-pressure water washing: Use high-pressure water to rinse the ultrasonically cleaned concrete surface to ensure that the cleaning agent residue is completely removed.

[0068] Step 7: Surface drying: Use hot air drying technology to dry the cleaned concrete surface to ensure that there is no excess moisture on the surface but maintain a certain humidity.

[0069] Step 8: Surface wetting treatment: Before applying the gel, properly wet the concrete surface to keep it moist but without obvious water marks.

[0070] Step 9: Check before coating: Before applying the gel, check whether the concrete surface is flat and clean to ensure the gel coating effect.

[0071] Step 10: Apply gel: Use a sprayer to evenly apply the saturated calcium nitrate solution gel on the concrete surface, and the coating thickness is controlled at 1.5 mm.

[0072] Step 11: Protection after coating: After coating, external impact and wiping should be avoided to ensure the integrity of the gel layer.

[0073] Step 12: Maintenance and management: After applying the gel, check the state of the gel layer on the concrete surface every day to ensure that it remains moist; apply additional coating if necessary based on changes in ambient humidity and temperature.

[0074] Step 13: Environmental monitoring: During the curing period, monitor the environmental humidity and temperature in real time and adjust the curing measures to ensure the effectiveness of the gel layer.

[0075] Step 14: Post-treatment: After the concrete reaches the predetermined curing period (28 days), the gel layer is removed by mechanical cleaning to ensure that the surface quality of the concrete is not affected.

[0076] Step 15: Surface quality inspection: After post-processing, the concrete surface quality inspection is carried out to ensure that the concrete surface quality and performance are not affected.

[0077] This example demonstrates the advantages of the present invention by selecting calcium nitrate and polyvinyl alcohol and controlling the specific operating parameters of each step. The use of saturated calcium nitrate solution and gelling agent to form a gel not only provides a durable and uniform wet environment, but also avoids the problem of excessive water loss and frequent watering in traditional methods, and also avoids the corrosion of chloride ions to steel bars, thereby ensuring the long-term durability of the concrete structure.

Claims

1. A method for ensuring humidity during the curing stage of a concrete structure, comprising the following steps: (1) preparing a saturated salt solution, then adding a gelling agent, stirring evenly, and standing to obtain a saturated salt solution gel; (2) Preliminary cleaning, ultrasonic cleaning, and high-pressure water washing of the concrete surface, followed by drying and wetting of the cleaned concrete surface; (3) Apply the saturated salt solution gel evenly on the concrete surface and then carry out maintenance.

2. The method according to claim 1, characterized in that: The salt in step (1) is a nitrate or a chloride.

3. The method according to claim 1, characterized in that: The gelling agent in step (1) is polyvinyl alcohol or carbomer.

4. The method according to claim 1, characterized in that: The mass ratio of the saturated salt solution to the gelling agent in the step (1) is 5-10:

1.

5. The method according to claim 1, characterized in that: The standing time in step (1) is 8-12 hours.

6. The method according to claim 1, characterized in that: The drying process in step (2) ensures that there is no excess moisture on the concrete surface.

7. The method according to claim 1, characterized in that: The wetting treatment in step (2) ensures that the concrete surface remains wet.

8. The method according to claim 1, characterized in that: The thickness of the saturated salt solution gel in step (3) is 1 mm to 2 mm.

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