A construction concrete curing process

Abstract

The application provides a construction concrete curing process and relates to the technical field of building construction, which comprises the following steps: surface film forming treatment is performed in the initial setting stage of the concrete; a composite curing layer with water retention and reflection functions is laid; the humidity of the concrete is monitored through a buried humidity sensor to obtain humidity data; a local water supplement system is controlled to operate according to the humidity data; and dynamic temperature regulation is implemented in combination with the ambient temperature. The water retention film layer seals the surface pores of the concrete, solving the early cracking caused by the rapid evaporation of water. The composite curing layer uniformly distributes water, eliminates the local dry-wet difference, reflects solar radiation, reduces the surface temperature and reduces the temperature stress cracks. The humidity of the concrete is monitored through the humidity sensor, and water is supplemented as needed, which reduces the water resource consumption compared with the timed spraying, achieves the water saving effect, and also solves the contradiction between the strength reduction caused by the excessive water supplement and the shrinkage caused by the insufficient water supplement in the traditional curing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a construction concrete curing process. BACKGROUND

[0002] Concrete curing is a key construction link to ensure its strength development, durability and crack resistance. Traditional curing methods mainly include natural watering, covering wet hessian or plastic film, etc. However, these methods have the following significant defects in practical application:

[0003] Natural watering curing relies on manual operation, and water evaporates quickly, especially in high temperature or dry environment, which easily leads to rapid water loss on the surface of concrete, causing plastic shrinkage cracks; covering wet hessian can delay water evaporation, but it needs frequent water replenishment, which is labor-intensive and causes serious water resource waste; although plastic film covering can reduce water loss, local gaps are easily formed between the film and the concrete surface, resulting in uneven curing, and the film is easily blown open or damaged, affecting the curing effect.

[0004] In mass concrete or high temperature environment, the traditional method is difficult to effectively regulate the temperature difference inside and outside the concrete, and cracks are easily caused by temperature stress. In the prior art, although the spray cooling has a certain effect, it easily causes surface water saturation, affecting the later strength of the concrete. SUMMARY

[0005] The purpose of the present application is to provide a construction concrete curing process, and the technical problem to be solved is how to achieve water-saving, efficient, intelligent and controllable concrete curing process, and regulate the temperature and humidity of concrete under complex environmental conditions, while achieving water-saving effect.

[0006] The present application is realized by the following technical solutions:

[0007] A construction concrete curing process, comprising the following steps:

[0008] Performing surface film forming treatment in the initial setting stage of the concrete;

[0009] Laying a composite curing layer with water retention and reflection functions;

[0010] Monitoring the humidity of the concrete through the buried humidity sensor to obtain humidity data;

[0011] Controlling the operation of the local water replenishment system according to the above humidity data;

[0012] Implementing dynamic temperature regulation in combination with the environmental temperature.

[0013] The water-retaining film formed in the initial setting stage can seal the pores on the surface of the concrete, reduce the amount of water evaporation, effectively inhibit plastic shrinkage cracks, and solve the early cracking caused by rapid water evaporation. Compared with simple water spraying maintenance, the film-forming agent can avoid the adverse effects of surface water saturation on the hydration reaction. Through the composite maintenance layer, water is evenly distributed, local dry-wet differences are eliminated, solar radiation is reflected, the surface temperature is reduced, and temperature stress cracks are reduced. By monitoring the humidity of the concrete with a humidity sensor, water is added as needed, which reduces the amount of water used compared to timed spraying and achieves water-saving effects. It also solves the contradiction between "excessive water supply leading to strength reduction" and "insufficient water supply causing shrinkage" in traditional maintenance. By controlling the temperature, the surface temperature of the concrete is reduced during the high-temperature period, and the temperature difference between the inside and outside of the concrete is controlled.

[0014] Further, the above surface film-forming treatment uses an acrylic-based film-forming agent, the spraying amount is 0.1-0.2 kg / m², and a water-retaining film layer with a thickness of 0.05-0.1 mm is formed.

[0015] Further, 1-3 wt% of nano-silicon dioxide particles with a particle size of 20-50 nm are added to the above acrylic-based film-forming agent.

[0016] Further, the above composite maintenance layer includes a water-absorbing non-woven fabric layer and a reflective aluminum foil film layer,

[0017] The above water-absorbing non-woven fabric layer directly contacts the surface of the concrete, and the weight of the water-absorbing non-woven fabric layer per square meter is greater than or equal to 200 g;

[0018] The above reflective aluminum foil film layer is covered on the upper surface of the water-absorbing non-woven fabric layer, and the reflectivity of the reflective aluminum foil film layer is greater than or equal to 85%.

[0019] Further, the edge of the above reflective aluminum foil film is provided with a magnetic fixing strip, and the above reflective aluminum foil film is connected to the embedded part embedded in the concrete through the magnetic fixing strip.

[0020] Further, the above humidity sensor is arranged in a matrix, and the distance between adjacent humidity sensors is less than 2 m; the monitoring depth of the above humidity sensor is 10-15 mm.

[0021] Further, the above local water supply system includes:

[0022] A microporous water permeation pipe is arranged in the composite maintenance layer, and the pore size of the microporous water permeation pipe is 0.1-0.3 mm;

[0023] When any of the above humidity sensors detects a humidity of less than 90%, the microporous water permeation pipe in the area corresponding to the humidity sensor is started to supply water.

[0024] Further, the above dynamic temperature regulation includes:

[0025] When the ambient temperature exceeds 30℃, the atomizing spray system will be activated during the preset time period each day.

[0026] A phase change material capsule is arranged in the above-mentioned composite curing layer, and the phase change material capsule is loaded with phase change material.

[0027] The phase change temperature of the aforementioned phase change material capsule is 28–32°C.

[0028] Furthermore, it also includes a maintenance quality monitoring step, which uses embedded fiber optic sensors to monitor internal stress data in the concrete and dynamically adjusts the maintenance cycle based on the stress data.

[0029] Furthermore, the curing cycle is 14 to 28 days, and curing is terminated when the internal stress change rate of the concrete is less than 0.01 MPa / d for 3 consecutive days; the internal stress change rate of the concrete is determined by stress data.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] The water-retaining film formed during the initial setting stage seals the pores on the concrete surface, reducing moisture evaporation and effectively inhibiting plastic shrinkage cracks, thus solving the problem of early cracking caused by rapid moisture evaporation. Compared to simple water spraying curing, the film-forming agent avoids the adverse effects of surface moisture saturation on the hydration reaction. The composite curing layer evenly distributes moisture, eliminating localized wet-dry differences, reflecting solar radiation, reducing surface temperature, and minimizing temperature stress cracking. By monitoring concrete humidity with a humidity sensor, water is added as needed, reducing water consumption compared to timed spraying, achieving water conservation. It also resolves the contradiction in traditional curing methods where "excessive watering leads to strength reduction" or "insufficient watering causes shrinkage." By controlling ambient temperature, atomized spraying lowers the concrete surface temperature during high-temperature periods, controlling the temperature difference between the inside and outside of the concrete. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0033] Figure 1 Main flowchart. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0035] Embodiment:

[0036] In combination Figure 1 At the initial setting stage of the concrete (2-4 hours after pouring), a water-retaining film layer with a thickness of 0.05-0.1 mm is formed by spraying an acrylic-based film-forming agent (preferably with 1%-3% nano-silicon dioxide) on the surface, effectively sealing the fine pores on the surface of the concrete and reducing water evaporation; a composite curing layer is then covered on the concrete with the water-retaining film layer, which includes a water-absorbing non-woven fabric and a reflective aluminum foil film. The water-absorbing non-woven fabric (gram weight ≥ 200 g / m²) is directly attached to the upper surface of the water-retaining film layer to uniformly absorb and slowly release water; the reflective aluminum foil film (reflectivity ≥ 85%) is fixed at the edges by magnetic strips, and has the functions of heat insulation, water retention, and wind protection.

[0037] Grid humidity sensors (spacing ≤ 2 m x 2 m, buried depth 10-15 mm) are arranged to monitor the real-time humidity of the concrete; micro-porous water pipes (pore size 0.1-0.3 mm) are used for targeted water replenishment according to the humidity sensor data, and automatically start water replenishment when the humidity is < 90%.

[0038] Phase change material capsules (paraffin type, phase change temperature 28-32℃) are embedded in the composite curing layer to buffer temperature fluctuations; an atomizing spraying system is intermittently started during high-temperature periods (10:00-16:00 when the temperature is > 30℃) to reduce the surface temperature of the concrete; dynamic temperature regulation is achieved through the phase change material capsules and the atomizing spraying system.

[0039] The internal stress changes of the concrete are monitored by optical fiber sensors, and when the stress change rate is < 0.01 MPa / d for 3 consecutive days, the curing is determined to be qualified. The above-mentioned internal stress change rate of the concrete is the ratio of adjacent stress data.

[0040] A referenceable use scenario for curing the concrete of the foundation slab of a high-rise building, with the concrete grade C40P8, pouring volume 1200 m³, environmental conditions: maximum daytime temperature 35℃, relative humidity 40%, wind speed 3 m / s; the specific implementation steps are as follows:

[0041] After 3 hours of concrete pouring, evenly spray the acrylic-nano-silicon dioxide composite film forming agent (nano-SiO2 content 2%) using an electric sprayer, dosage 0.15 kg / m2, forming a continuous water-retaining film layer with a thickness of about 0.08 mm; select 250 g / m2 of polyester fiber non-woven fabric, ensure complete adhesion to the concrete surface during laying, and the overlapping width at the joint is ≥100 mm; lay the aluminum foil composite reflective film, the edges are fixed with magnetic rubber strips (spacing 500 mm), and the corner parts are reinforced and fixed; select a humidity sensor of model SHT35, and pre-bury it in the concrete according to a 1.5 m x 1.5 m grid, with a burying depth of 12 mm; arrange the temperature measuring optical cable along the steel bar mesh to monitor the ambient temperature. Set the humidity threshold value to 90%, when the humidity of the monitoring point is <90%, start the micro-porous water permeation pipe in the corresponding area, and the water replenishment time is 3-5 minutes / time; use paraffin / graphene composite phase change capsules (phase change temperature 30℃), and arrange the density to be 6 pieces / m2, when the surface temperature is >32℃, start the atomizing spray (each time for 2 minutes, interval 15 minutes); the curing effect detection shows that the maximum internal temperature of the concrete is 56℃ (traditional curing comparison group 62℃), the surface humidity is maintained at 92-95% RH, and the maximum temperature difference between the inside and outside is 23℃ (satisfying the specification requirements). The quality detection results are: 28-day compressive strength standard compliance rate 100%, surface cracks: 0.05 pieces / m2 (comparison group 0.4 pieces / m2), and chloride ion permeability coefficient <1000 C.

[0042] A reference use scenario for curing of road surface concrete in high-temperature and arid regions, concrete grade: C30, construction area: 5000 m2, environmental conditions: maximum daytime temperature 42℃, relative humidity 25%; the specific implementation steps are as follows:

[0043] Add 3% nano-SiO2 to the film forming agent, increase the spraying amount to 0.18 kg / m2, increase the basis weight of the non-woven fabric to 300 g / m2, and coat an ultraviolet protection layer on the surface of the aluminum foil film; increase the phase change material capsules to 8 pieces / m2, and increase the frequency of the atomizing spray to once per hour, to realize temperature control optimization; detection shows that the water evaporation amount is reduced by 65% (compared with traditional curing), no temperature cracks are found on the surface, and the curing period is shortened to 18 days (traditional curing needs 25 days).

[0044] A reference use scenario for curing of concrete in winter construction, concrete grade: C50, environmental conditions: average daily temperature -5℃, minimum -12℃; the specific implementation steps are as follows:

[0045] Low temperature type acrylate film forming agent (cold resistance -20℃) is used, 400 g / m² thick non-woven fabric is used for the lower layer of the composite curing layer, aerogel insulation felt is used for the middle layer, and aluminum foil reflective film is used for the upper layer; the phase change material is changed to octadecane (phase change temperature 28℃), and an electric heat tracing system is additionally arranged to assist heat preservation; through detection, the internal temperature of the concrete is maintained above 15℃, the 28-day strength reaches 105% of the design value, and there is no freeze injury mark on the surface.

[0046] The above specific embodiments further explain the purpose, technical solutions and advantages of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A construction concrete curing process, characterized by, The method comprises the following steps: carrying out surface film forming treatment at the initial setting stage of the concrete; laying a composite curing layer with water retention and reflection functions; the composite curing layer comprises a reflective aluminum foil film, and the composite curing layer is embedded with phase change material capsules and microporous water permeation pipes; monitoring the humidity of the concrete through the embedded humidity sensors to obtain humidity data; controlling the operation of a local water replenishment system according to the humidity data; implementing dynamic temperature regulation through the reflective aluminum foil film, the phase change material capsules and a atomizing spray system in combination with the ambient temperature; the surface film forming treatment uses an acrylic-based film forming agent, the spraying amount is 0.1-0.2 kg / m2, and a water retention film layer with a thickness of 0.05-0.1 mm is formed; 1-3 wt% of nano-silicon dioxide particles with a particle size of 20-50 nm are added to the acrylic-based film forming agent.

2. The construction concrete curing process of claim 1, wherein: the composite curing layer comprises a water-absorbing non-woven fabric layer, the water-absorbing non-woven fabric layer directly contacts the surface of the concrete, and the weight of the water-absorbing non-woven fabric layer per square meter is greater than or equal to 200 g; the reflective aluminum foil film layer is covered on the upper surface of the water-absorbing non-woven fabric layer, and the reflectivity of the reflective aluminum foil film layer is greater than or equal to 85%.

3. The construction concrete curing process of claim 2, wherein: magnetic fixing strips are arranged at the edges of the reflective aluminum foil film, and the reflective aluminum foil film is connected to the embedded part of the concrete through the magnetic fixing strips.

4. The construction concrete curing process of claim 1, wherein: The humidity sensors are arranged in a matrix, and the distance between adjacent humidity sensors is less than 2 m; the monitoring depth of the humidity sensors is 10-15 mm.

5. The construction concrete curing process of claim 1, wherein: The local water replenishment system comprises: microporous water permeation pipes arranged in the composite curing layer, and the pore size of the microporous water permeation pipes is 0.1-0.3 mm; when any of the humidity sensors detects that the humidity is lower than 90%, the microporous water permeation pipes in the area corresponding to the humidity sensor are started to replenish water.

6. The construction concrete curing process of claim 1, wherein: The dynamic temperature regulation comprises: when the ambient temperature is greater than 30℃, the atomizing spray system is started at a preset time period every day; the phase change material capsules are loaded with phase change materials; the phase change temperature of the phase change material capsules is 28-32℃.

7. The process for curing construction concrete according to any one of claims 1 to 6, characterized in that: The method further comprises a curing quality monitoring step, in which the internal stress data of the concrete are monitored through the embedded optical fiber sensors, and the curing period is dynamically adjusted according to the stress data.

8. The construction concrete curing process of claim 7, wherein: The curing period is 14-28 days, and the curing is terminated when the internal stress change rate of the concrete is less than 0.01 MPa / d for 3 consecutive days; the internal stress change rate of the concrete is determined through the stress data.

Images