CN112049445A - Seasonal construction and maintenance process for concrete - Google Patents
Seasonal construction and maintenance process for concrete Download PDFInfo
- Publication number
- CN112049445A CN112049445A CN202010891446.3A CN202010891446A CN112049445A CN 112049445 A CN112049445 A CN 112049445A CN 202010891446 A CN202010891446 A CN 202010891446A CN 112049445 A CN112049445 A CN 112049445A
- Authority
- CN
- China
- Prior art keywords
- concrete
- temperature
- construction
- water
- maintenance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 249
- 238000010276 construction Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000012423 maintenance Methods 0.000 title claims abstract description 32
- 230000001932 seasonal effect Effects 0.000 title claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000005338 heat storage Methods 0.000 claims abstract description 13
- 239000011398 Portland cement Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000004321 preservation Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 52
- 238000002156 mixing Methods 0.000 claims description 27
- 239000004568 cement Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 17
- 239000004744 fabric Substances 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 13
- 239000004746 geotextile Substances 0.000 claims description 8
- 230000036571 hydration Effects 0.000 claims description 8
- 238000006703 hydration reaction Methods 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000005336 cracking Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 4
- 239000010881 fly ash Substances 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000007788 roughening Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000010902 straw Substances 0.000 claims description 4
- 238000007730 finishing process Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 235000015097 nutrients Nutrition 0.000 claims description 2
- 238000007710 freezing Methods 0.000 abstract description 4
- 230000008014 freezing Effects 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000036561 sun exposure Effects 0.000 description 2
- 235000020681 well water Nutrition 0.000 description 2
- 239000002349 well water Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/246—Safety or protective measures preventing damage to building parts or finishing work during construction specially adapted for curing concrete in situ, e.g. by covering it with protective sheets
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/28—Safety or protective measures preventing damage to building parts or finishing work during construction against unfavourable weather influence
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention relates to a seasonal construction and maintenance process for concrete, which comprises the following steps: construction and maintenance in winter; step 1, pouring concrete; adding Portland cement or common Portland cement into the concrete to prepare the concrete, so that the concrete cannot be frozen until the compressive strength reaches 30% of the designed strength, and simultaneously adding an antifreezing agent into the concrete mixture; step 2, concrete heat preservation; the concrete is insulated by a heat storage method or a greenhouse method; step 3, concrete curing; the invention avoids the construction stop phenomenon in hot summer or winter, and ensures the normal operation of construction; the temperature of the concrete is guaranteed in winter, and the concrete is prevented from freezing; in summer, the temperature of the concrete is reduced by reducing the temperature of the concrete raw material; the contact surface of the old concrete and the new concrete is improved by chiseling on the old concrete, so that the new concrete is conveniently bonded on the old concrete.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a seasonal construction and maintenance process for concrete.
Background
Concrete, concrete for short: refers to the general name of engineering composite materials formed by cementing aggregate into a whole by cementing materials. The term concrete generally refers to cement as the cementing material and sand and stone as the aggregate; the cement concrete, also called as common concrete, is obtained by mixing with water (which may contain additives and admixtures) according to a certain proportion and stirring, and is widely applied to civil engineering.
The prior concrete construction and maintenance process has the following defects:
1. the concrete can not normally run in hot summer and winter, so that the construction time of the concrete is prolonged;
2. the concrete is difficult to maintain in winter, so that part of the concrete is frozen;
3. the temperature is too high in summer, so that the new concrete is difficult to bond with the old concrete, and the construction difficulty is improved.
Disclosure of Invention
The invention aims to provide a self-compacting rock-fill concrete construction process to solve the problems in the background technology.
In order to realize the aim, the seasonal construction and maintenance process for the concrete comprises the following steps:
construction and maintenance in winter;
step 1, pouring concrete; adding Portland cement or common Portland cement into the concrete to prepare the concrete, so that the concrete cannot be frozen until the compressive strength reaches 30% of the designed strength, and simultaneously adding an antifreezing agent into the concrete mixture;
step 2, concrete heat preservation; the concrete is insulated by a heat storage method or a greenhouse method;
step 3, concrete curing; uniformly sprinkling water on the surface of the concrete for maintenance, then completely covering the periphery with the thick geotextile, and bonding the plastic cloth and the concrete at the joint by using the sealing plastic adhesive tape paper to ensure that the moisture of the concrete is not evaporated to the outside;
construction and maintenance are carried out in summer;
step 4, controlling the temperature of the raw materials; the temperature of the raw materials is prevented from rising due to direct irradiation of sunlight on the aggregates, and meanwhile, the sun-proof canopy of the batching machine of the mixer is also repaired and reinforced;
step 5, mixing the concrete; the construction mixing proportion is optimized, and a water reducing agent or fly ash is used for replacing part of cement so as to reduce the using amount of the cement; the hydration heat of the concrete is reduced to the maximum extent;
step 6, transporting the concrete; a sunshade used by a concrete delivery truck is erected outside the concrete delivery pipeline; the concrete pump pipe is coated with water-retaining materials such as geotextile with the thickness of 30mm, sponge and the like, and water is sprayed to keep moist, so that the temperature rise of the concrete mixture caused by transportation is reduced;
step 7, pouring concrete; pouring concrete at night, and when pouring new concrete on the surface of old concrete, cooling the old concrete structure by water except for roughening the surface of the old concrete to ensure that the temperature of the concrete contact surface is lower than 30 ℃, which is basically equivalent to the temperature of the newly poured concrete;
step 8, finishing concrete; when the concrete is poured under the hot weather condition, the concrete is carefully planned, continuously and quickly poured and trimmed in time;
step 9, curing the concrete; spraying water to the surface or adopting windproof measures to reduce the evaporation speed of the surface.
Preferably, in the step 1, the concrete discharging temperature is more than or equal to 10 ℃, the mold entering temperature is more than or equal to 5 ℃, the curing temperature is more than or equal to 5 ℃, and the curing temperature of the thin-wall structure is more than or equal to 10 ℃.
Preferably, in the step 2, the heat storage method is a method in which heat is preserved on the outer surface of the concrete block by using a material having low heat conductivity, and the heat source is heat pre-added to the concrete component material and cement hydration heat.
Preferably, in the step 3, a straw mat is additionally arranged on the plastic cloth to ensure the temperature of the concrete.
Preferably, in the step 4, the gelled material is coated with a reflective coating outside the tank body to reduce the heat absorption performance of the tank body, or the tank body is shaded in a mode of wrapping sun-proof cloth outside the tank body, and the tank body is covered with an additive and the like for shading.
Preferably, in the step 5, cold water or ice blocks are added to replace part of the mixing water during concrete construction, so that the temperature of the mixture is effectively reduced.
Preferably, in the step 6, equipment inspection is enhanced, the transportation capacity of concrete is guaranteed, and meanwhile, the construction access is guaranteed to be flat and smooth; the transportation time is shortened.
Preferably, in the step 7, air axial flow spray cooling equipment is installed on a concrete pouring site, the installation density is 50 square meters per square meter, and the spraying duration is not less than 14 days.
Preferably, in the step 8, a sunshade is erected after the concrete pouring is finished; the method prevents the surface from solidifying too fast to influence the finishing quality in the finishing process, and prevents the possible occurrence of drying shrinkage cracking.
Preferably, in the step 9, the concrete can be cured early by spraying with a sprayer or curing with a nutrient solution, so that excessive water spraying on the surface is avoided.
The invention has the following beneficial effects:
1. the construction stop phenomenon in hot summer or winter is avoided, and the normal operation of construction is guaranteed;
2. the temperature of the concrete is guaranteed in winter, and the concrete is prevented from freezing;
3. in summer, the temperature of the concrete raw material is reduced, so that the temperature of the concrete is reduced;
4. the contact surface of the old concrete and the new concrete is improved by chiseling on the old concrete, so that the new concrete is conveniently bonded on the old concrete.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A seasonal construction and maintenance process for concrete comprises the following steps:
construction and maintenance in winter;
step 1, pouring concrete; adding Portland cement or common Portland cement into the concrete to prepare the concrete, so that the concrete cannot be frozen until the compressive strength reaches 30% of the designed strength, and simultaneously adding an antifreezing agent into the concrete mixture;
step 2, concrete heat preservation; the concrete is insulated by a heat storage method or a greenhouse method;
step 3, concrete curing; uniformly sprinkling water on the surface of the concrete for maintenance, then completely covering the periphery with the thick geotextile, and bonding the plastic cloth and the concrete at the joint by using the sealing plastic adhesive tape paper to ensure that the moisture of the concrete is not evaporated to the outside;
construction and maintenance are carried out in summer;
step 4, controlling the temperature of the raw materials; the temperature of the raw materials is prevented from rising due to direct irradiation of sunlight on the aggregates, and meanwhile, the sun-proof canopy of the batching machine of the mixer is also repaired and reinforced;
step 5, mixing the concrete; the construction mixing proportion is optimized, and a water reducing agent or fly ash is used for replacing part of cement so as to reduce the using amount of the cement; the hydration heat of the concrete is reduced to the maximum extent;
step 6, transporting the concrete; a sunshade used by a concrete delivery truck is erected outside the concrete delivery pipeline; the concrete pump pipe is coated with water-retaining materials such as geotextile with the thickness of 30mm, sponge and the like, and water is sprayed to keep moist, so that the temperature rise of the concrete mixture caused by transportation is reduced;
step 7, pouring concrete; pouring concrete at night, and when pouring new concrete on the surface of old concrete, cooling the old concrete structure by water except for roughening the surface of the old concrete to ensure that the temperature of the concrete contact surface is lower than 30 ℃, which is basically equivalent to the temperature of the newly poured concrete;
step 8, finishing concrete; when the concrete is poured under the hot weather condition, the concrete is carefully planned, continuously and quickly poured and trimmed in time;
step 9, curing the concrete; spraying water to the surface or adopting windproof measures to reduce the evaporation speed of the surface.
In the step 1, the concrete discharging temperature is more than or equal to 10 ℃, the mold entering temperature is more than or equal to 5 ℃, the curing temperature of the thin-wall structure is more than or equal to 10 ℃, and ice, snow and dirt on the template and the reinforcing steel bars are removed before concrete pouring. When the environmental temperature is lower than-10 ℃, the steel bars and the metal embedded parts with the diameter of more than or equal to 25mm are heated to normal temperature; when the old concrete surface and the exposed steel bars (embedded parts) are exposed in cold air, the distance between the old concrete surface and the exposed steel bars (embedded parts) and the new concrete construction joint is within 1.5 m. The old concrete and exposed reinforcing steel bars (embedded parts) with the length within 1.0m are used for cold protection and heat preservation.
In step 2, the heat storage method is to use a material with low heat conductivity to preserve heat on the outer surface of the concrete pouring block, the heat source is heat pre-added to the concrete composition material and cement hydration heat, the heat storage method is a surface heat preservation method in essence, and the form is consistent with the surface protection of the concrete; their purposes and requirements are different; the purpose of the heat storage method is to prevent freezing damage to the surface layer of concrete, which requires the surface layer temperature of concrete not lower than the temperature at which it is normally set and hardened.
And 3, covering a straw curtain outside the plastic cloth to ensure the temperature of the concrete, and checking the temperature in the greenhouse at any time to ensure that the temperature is not lower than 10 ℃ until the frost resistance is achieved.
Step 4, coating a reflective coating on the outside of the tank body by using a cementing material to reduce the heat absorption performance of the tank body, or performing sun shading by wrapping sun-proof cloth on the outside of the tank body, and reinforcing and repairing the tank body by using a sun-shading ceiling on the top of the reservoir by using an additive and the like, so that the sun exposure is prevented, and the temperature of water for mixing is not influenced; when necessary, ice blocks are added in the water tank to reduce the water temperature of the mixing water, and if the water temperature in the water storage tank can not ensure the mixing temperature, the well water is directly used for mixing.
In the step 5, during concrete construction, cold water or ice blocks are added to replace part of mixing water to effectively reduce the temperature of the mixture, fine aggregates and additives are added firstly, water is added to be uniformly mixed, then coarse aggregates are added, and in order to ensure that the concrete is uniformly mixed and fully hydrated, the mixing time of the concrete is not less than 120 s.
Example 2
A seasonal construction and maintenance process for concrete comprises the following steps:
construction and maintenance in winter;
step 1, pouring concrete; adding Portland cement or common Portland cement into the concrete to prepare the concrete, so that the concrete cannot be frozen until the compressive strength reaches 30% of the designed strength, and simultaneously adding an antifreezing agent into the concrete mixture;
step 2, concrete heat preservation; the concrete is insulated by a heat storage method or a greenhouse method;
step 3, concrete curing; uniformly sprinkling water on the surface of the concrete for maintenance, then completely covering the periphery with the thick geotextile, and bonding the plastic cloth and the concrete at the joint by using the sealing plastic adhesive tape paper to ensure that the moisture of the concrete is not evaporated to the outside;
construction and maintenance are carried out in summer;
step 4, controlling the temperature of the raw materials; the temperature of the raw materials is prevented from rising due to direct irradiation of sunlight on the aggregates, and meanwhile, the sun-proof canopy of the batching machine of the mixer is also repaired and reinforced;
step 5, mixing the concrete; the construction mixing proportion is optimized, and a water reducing agent or fly ash is used for replacing part of cement so as to reduce the using amount of the cement; the hydration heat of the concrete is reduced to the maximum extent;
step 6, transporting the concrete; a sunshade used by a concrete delivery truck is erected outside the concrete delivery pipeline; the concrete pump pipe is coated with water-retaining materials such as geotextile with the thickness of 30mm, sponge and the like, and water is sprayed to keep moist, so that the temperature rise of the concrete mixture caused by transportation is reduced;
step 7, pouring concrete; pouring concrete at night, and when pouring new concrete on the surface of old concrete, cooling the old concrete structure by water except for roughening the surface of the old concrete to ensure that the temperature of the concrete contact surface is lower than 30 ℃, which is basically equivalent to the temperature of the newly poured concrete;
step 8, finishing concrete; when the concrete is poured under the hot weather condition, the concrete is carefully planned, continuously and quickly poured and trimmed in time;
step 9, curing the concrete; spraying water to the surface or adopting windproof measures to reduce the evaporation speed of the surface.
In the step 1, the concrete discharging temperature is more than or equal to 10 ℃, the mold entering temperature is more than or equal to 5 ℃, the curing temperature of the thin-wall structure is more than or equal to 10 ℃, and ice, snow and dirt on the template and the reinforcing steel bars are removed before concrete pouring. When the environmental temperature is lower than-10 ℃, the steel bars and the metal embedded parts with the diameter of more than or equal to 25mm are heated to normal temperature; when the old concrete surface and the exposed steel bars (embedded parts) are exposed in cold air, the distance between the old concrete surface and the exposed steel bars (embedded parts) and the new concrete construction joint is within 1.5 m. The old concrete and exposed reinforcing steel bars (embedded parts) with the length within 1.0m are used for cold protection and heat preservation.
In step 2, the heat storage method is to use a material with low heat conductivity to preserve heat on the outer surface of the concrete pouring block, the heat source is heat pre-added to the concrete composition material and cement hydration heat, the heat storage method is a surface heat preservation method in essence, and the form is consistent with the surface protection of the concrete; their purposes and requirements are different; the purpose of the heat storage method is to prevent freezing damage to the surface layer of concrete, which requires the surface layer temperature of concrete not lower than the temperature at which it is normally set and hardened.
And 3, covering a straw curtain outside the plastic cloth to ensure the temperature of the concrete, and checking the temperature in the greenhouse at any time to ensure that the temperature is not lower than 10 ℃ until the frost resistance is achieved.
Step 4, coating a reflective coating on the outside of the tank body by using a cementing material to reduce the heat absorption performance of the tank body, or performing sun shading by wrapping sun-proof cloth on the outside of the tank body, and reinforcing and repairing the tank body by using a sun-shading ceiling on the top of the reservoir by using an additive and the like, so that the sun exposure is prevented, and the temperature of water for mixing is not influenced; when necessary, ice blocks are added in the water tank to reduce the water temperature of the mixing water, and if the water temperature in the water storage tank can not ensure the mixing temperature, the well water is directly used for mixing.
In the step 5, during concrete construction, cold water or ice blocks are added to replace part of mixing water to effectively reduce the temperature of the mixture, fine aggregates and additives are added firstly, water is added to be uniformly mixed, then coarse aggregates are added, and in order to ensure that the concrete is uniformly mixed and fully hydrated, the mixing time of the concrete is not less than 120 s.
In the step 6, equipment inspection is enhanced, the transportation capacity of concrete is guaranteed, and meanwhile, the construction access is guaranteed to be flat and smooth; the transportation time is shortened.
And 7, installing air axial flow spray cooling equipment on a concrete pouring site, wherein the installation density is 50 square meters per square meter, the spraying duration is not less than 14 days, testing the slump, air content, mold entering temperature, water-cement ratio, bleeding rate and other properties of a mixture before and during concrete pouring in summer, recording the performance indexes of the concrete, measuring the first batch of concrete, and measuring the concrete every 2 hours later.
Step 8, erecting a sunshade after concrete pouring is finished; the method has the advantages that the condition that the surface is solidified too fast in the finishing process to influence the finishing quality is prevented, the possible shrinkage cracking is prevented, after the concrete is poured, the surface plastering and press polishing treatment is timely carried out on the exposed part of the structure according to the solidification degree of the concrete, the surface laitance is required to be removed, the surface plastering is not less than three times, and the surface shrinkage cracking is prevented; in the plastering process, water spraying and plastering and cement mixing are strictly forbidden.
In the step 9, the concrete can be maintained in early stage by spraying with a sprayer or by using a maintenance liquid, so that excessive water spraying on the surface is avoided; and (3) determining the form removal time according to the difference between the measured concrete internal temperature and the measured external air temperature by the form removal of the concrete until the difference between the air temperature and the concrete internal temperature is less than 20 ℃. And meanwhile, the template is dismantled in a way that the concrete strength is not lower than 2.5MPa at minimum, and the surface and edges of the concrete are not damaged by dismantling the template.
In the rainy period, the following measures are taken:
1. by utilizing the characteristics of the rockfill material, the middle part of the bin surface is piled higher than the edges of the upper stream and the lower stream to form a bidirectional cross slope which is more than 4 percent, and a mode that the middle part is slightly higher and the two sides are slightly lower is always formed during each pouring, so that the accumulated water on the bin surface can be timely discharged.
2. When heavy rain occurs in concrete pouring, the whole pouring bin surface is covered in time, pouring is stopped immediately after a construction joint is kept in a proper position in time according to the standard requirement, and the plastic cloth and the reinforcing steel bars are firmly bound to prevent the plastic cloth from being blown away by wind.
2. After rain, the temporary construction joint is reinforced, the remained slurry and weak parts are removed, dirt and accumulated water on the surface of the bin are cleaned and qualified through inspection, and concrete can be continuously poured behind the additionally paved joint concrete.
3. In order to improve the quality of concrete, during construction in a rainy period, a mixing station is required to enhance the measurement of the actual water content of sand and stone, adjust the water consumption of the concrete in time, properly reduce the water consumption for mixing the concrete and the slump of the concrete at a machine outlet, and properly reduce the water-cement ratio of the concrete when necessary to ensure the quality of the concrete. And a technician is periodically sent to the mixing plant to check the sand and stone stockpiling yard and the cement warehouse, and the water-containing mud content of the sand and the stone and the rainproof condition of the cement are checked. Sand, stone and ineffective cement with excessive mud content are strictly forbidden to be used in engineering.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A seasonal construction and maintenance process for concrete is characterized by comprising the following steps:
construction and maintenance in winter;
step 1, pouring concrete; adding Portland cement or common Portland cement into the concrete to prepare the concrete, so that the concrete cannot be frozen until the compressive strength reaches 30% of the designed strength, and simultaneously adding an antifreezing agent into the concrete mixture;
step 2, concrete heat preservation; the concrete is insulated by a heat storage method or a greenhouse method;
step 3, concrete curing; uniformly sprinkling water on the surface of the concrete for maintenance, then completely covering the periphery with the thick geotextile, and bonding the plastic cloth and the concrete at the joint by using the sealing plastic adhesive tape paper to ensure that the moisture of the concrete is not evaporated to the outside;
construction and maintenance are carried out in summer;
step 4, controlling the temperature of the raw materials; the temperature of the raw materials is prevented from rising due to direct irradiation of sunlight on the aggregates, and meanwhile, the sun-proof canopy of the batching machine of the mixer is also repaired and reinforced;
step 5, mixing the concrete; the construction mixing proportion is optimized, and a water reducing agent or fly ash is used for replacing part of cement so as to reduce the using amount of the cement; the hydration heat of the concrete is reduced to the maximum extent;
step 6, transporting the concrete; a sunshade used by a concrete delivery truck is erected outside the concrete delivery pipeline; the concrete pump pipe is coated with water-retaining materials such as geotextile with the thickness of 30mm, sponge and the like, and water is sprayed to keep moist, so that the temperature rise of the concrete mixture caused by transportation is reduced;
step 7, pouring concrete; pouring concrete at night, and when pouring new concrete on the surface of old concrete, cooling the old concrete structure by water except for roughening the surface of the old concrete to ensure that the temperature of the concrete contact surface is lower than 30 ℃, which is basically equivalent to the temperature of the newly poured concrete;
step 8, finishing concrete; when the concrete is poured under the hot weather condition, the concrete is carefully planned, continuously and quickly poured and trimmed in time;
step 9, curing the concrete; spraying water to the surface or adopting windproof measures to reduce the evaporation speed of the surface.
2. The seasonal construction and maintenance process for concrete according to claim 1, wherein in the step 1, the concrete discharging temperature is more than or equal to 10 ℃, the mold entering temperature is more than or equal to 5 ℃, the maintenance temperature is more than or equal to 5 ℃, and the maintenance temperature for the thin-wall structure is more than or equal to 10 ℃.
3. The seasonal construction curing process of concrete according to claim 1, wherein in the step 2, the heat storage method is a method of maintaining the temperature of the outer surface of the concrete block using a material having low heat conductivity, and the heat source is heat pre-applied to the concrete component material and cement hydration heat.
4. The seasonal construction and maintenance process of concrete according to claim 1, wherein in the step 3, a straw mat is additionally arranged on the plastic cloth to ensure the temperature of the concrete.
5. The seasonal construction and maintenance process for concrete according to claim 1, wherein in the step 4, the gelled material is coated with a reflective coating outside the tank body to reduce the heat absorption performance of the tank body, or the tank body is shaded in a manner of wrapping sun-proof cloth outside the tank body, and the tank body is covered with an additive and shaded.
6. The seasonal construction and maintenance process for concrete according to claim 1, wherein in the step 5, cold water or ice blocks are added to replace part of the mixing water during concrete construction, so as to effectively reduce the temperature of the mixture.
7. The seasonal construction and maintenance process for concrete according to claim 1, wherein in the step 6, equipment inspection is enhanced to ensure the transportation capability of concrete and ensure that a construction access is flat and smooth; the transportation time is shortened.
8. The seasonal construction and maintenance process for concrete according to claim 1, wherein in the step 7, air axial flow spray cooling equipment is installed on a concrete pouring site, the installation density is 50 square meters per square meter, and the spraying duration is not less than 14 days.
9. The seasonal construction and maintenance process of concrete according to claim 1, wherein in the step 8, a sunshade is built after the concrete is poured; the method prevents the surface from solidifying too fast to influence the finishing quality in the finishing process, and prevents the possible occurrence of drying shrinkage cracking.
10. The seasonal construction curing process of concrete according to claim 1, wherein in the step 9, the concrete is cured at an early stage by spraying with a sprayer or curing with a nutrient solution, so as to avoid excessive sprinkling on the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010891446.3A CN112049445A (en) | 2020-08-30 | 2020-08-30 | Seasonal construction and maintenance process for concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010891446.3A CN112049445A (en) | 2020-08-30 | 2020-08-30 | Seasonal construction and maintenance process for concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112049445A true CN112049445A (en) | 2020-12-08 |
Family
ID=73607047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010891446.3A Pending CN112049445A (en) | 2020-08-30 | 2020-08-30 | Seasonal construction and maintenance process for concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112049445A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112592122A (en) * | 2020-12-23 | 2021-04-02 | 宿迁市京成建材有限公司 | Preparation method of frost-resistant and crack-resistant concrete |
| CN114872197A (en) * | 2022-04-19 | 2022-08-09 | 江西省交通工程集团建设有限公司 | Control method for mold-entering temperature of mass concrete |
| CN115679967A (en) * | 2022-11-14 | 2023-02-03 | 山东汇通建设集团有限公司 | In-situ concrete pouring curing method for underground space |
| CN117090395A (en) * | 2023-08-22 | 2023-11-21 | 中冶路桥建设有限公司 | Construction process of high-strength reinforced concrete of logistics factory building in strong earthquake region |
-
2020
- 2020-08-30 CN CN202010891446.3A patent/CN112049445A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 无: ""冬季混凝土施工技术交底"", 《HTTPS://WENKU.BAIDU.COM/VIEW/5B6D81FF5B8102D276A20029BD64783E09127D86.HTML》 * |
| 无: ""夏季混凝土施工要想不开裂，这套混凝土养护方案一定要掌握"", 《HTTPS://BAIJIAHAO.BAIDU.COM/S?ID=1669908989144598466&WFR=SPIDER&FOR=PC》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112592122A (en) * | 2020-12-23 | 2021-04-02 | 宿迁市京成建材有限公司 | Preparation method of frost-resistant and crack-resistant concrete |
| CN114872197A (en) * | 2022-04-19 | 2022-08-09 | 江西省交通工程集团建设有限公司 | Control method for mold-entering temperature of mass concrete |
| CN115679967A (en) * | 2022-11-14 | 2023-02-03 | 山东汇通建设集团有限公司 | In-situ concrete pouring curing method for underground space |
| CN117090395A (en) * | 2023-08-22 | 2023-11-21 | 中冶路桥建设有限公司 | Construction process of high-strength reinforced concrete of logistics factory building in strong earthquake region |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112049445A (en) | Seasonal construction and maintenance process for concrete | |
| CN101293763B (en) | Water permeable concrete and pavement construction method | |
| CN110184877B (en) | A kind of sponge city ecological treatment road system and its construction method | |
| CN110966022A (en) | Railway tunnel lining construction method based on medium-high fluidity concrete | |
| CN111350268A (en) | Construction method of concrete structure self-waterproof system in sewage treatment engineering | |
| CN113929364A (en) | Preparation method and application of high-performance water-permeable concrete | |
| CN110820750A (en) | Self-compacting concrete construction method | |
| CN112227155A (en) | Winter construction method for highway concrete | |
| KR100833133B1 (en) | Mortar composition for repair or reinforcement and construction method using same | |
| CN108755325B (en) | Cold region fabricated road and construction method thereof | |
| CN208023405U (en) | One kind being used for severe cold area high-speed railway bridge floor water-protected enclosure system | |
| CN107540314B (en) | Post-cast strip base surface treating agent and construction method thereof | |
| CN105819792A (en) | Repair process for rapidly-formed concrete and expansion joints | |
| CN112408851A (en) | Anti-radiation semi-permanent nano-penetration crystallization sealing compacting agent and use method thereof | |
| CN108569872B (en) | Protective material and application of protective material as building surface protective layer and repairing building corrosion part | |
| CN105503057A (en) | Sand-concrete water permeable brick suitable for sponge city construction and preparing method of sand-concrete permeable brick | |
| CN107986742B (en) | A kind of water-permeable and water-retaining material and preparation method thereof | |
| CN107881894B (en) | Construction and maintenance method for concrete expansion joint in severe cold area | |
| CN204589756U (en) | A kind of L-type Kerb of concrete | |
| CN101545320A (en) | Method for compensation and anti-permeation of temperature difference cracks of ground concrete high-temperature pool | |
| CN116180746A (en) | Large-volume concrete construction process capable of effectively preventing concrete from shrinking in temperature | |
| CN109083027B (en) | Culvert repairing method | |
| WO2020093225A1 (en) | Concrete for rainforest zones and construction method for pouring foundation therefor | |
| Schrader et al. | Design and mix studies with high and low cementitious content RCC for Nordlingaalda dam in Iceland | |
| CN114737435B (en) | Pavement adopting heat reflection bricks for mixing and splicing water permeable bricks and paving method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201208 |
|
| RJ01 | Rejection of invention patent application after publication |