CN111098399A - Concrete interlocking block curing method - Google Patents
Concrete interlocking block curing method Download PDFInfo
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- CN111098399A CN111098399A CN201911120388.8A CN201911120388A CN111098399A CN 111098399 A CN111098399 A CN 111098399A CN 201911120388 A CN201911120388 A CN 201911120388A CN 111098399 A CN111098399 A CN 111098399A
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- temperature
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- curing
- interlocking block
- steam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
- C04B40/0245—Steam hardening, e.g. in an autoclave including a pre-curing step not involving a steam or autoclave treatment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
The invention relates to the technical field of constructional engineering, in particular to a concrete interlocking block curing method, which comprises the following implementation steps: step one, after a concrete mixture is subjected to a vibrating process, hoisting a concrete product with a template to a steam pool; step two, statically curing the concrete product for 1.5-2 hours, and covering the exposed surface of the product with a heat-insulating water-retaining material; feeding air for steam curing, and entering a temperature rise stage, wherein the temperature rise speed is controlled to be 15-25 ℃/h; step four, entering a constant temperature stage, keeping the steam curing temperature constant, controlling the constant temperature at 50-90 ℃, and keeping the constant temperature for 2-3 hours; step five, entering a cooling stage, and starting constant-speed cooling after the concrete product reaches the form removal strength or the tensile strength, wherein the cooling speed is controlled at 15-25 ℃/h; and sixthly, removing the heat-preservation and water-retention material, and discharging the concrete interlocking blocks out of the pool.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a method for maintaining a concrete interlocking block.
Background
The cement concrete interlocking block pavement is a novel pavement form, is introduced into China in the middle of the 80 th's of the 20 th century, has been applied to yard projects of a plurality of wharfs in China so far due to the unique superiority, and has obtained great social benefit and economic effect
The interlocking block pavement is a pavement with a surface layer formed by closely arranging high-strength and high-precision cement concrete precast blocks according to a specific method and filling joints among the blocks with sand, and under the action of external load, the blocks are not stressed independently but are mutually interlocked to diffuse load.
In the prior art, the concrete interlocking blocks are basically maintained in the open air in the prefabricating construction, the maintenance time is long, the production period is prolonged, the equipment utilization rate is reduced, the open air maintenance is easily affected by severe weather, and the construction efficiency cannot meet the requirement of large-scale production.
Disclosure of Invention
The invention aims to provide a concrete interlocking block curing method to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a concrete interlocking block curing method specifically comprises the following implementation steps:
step one, after a concrete mixture is subjected to a vibrating process, hoisting a concrete product with a template to a steam pool;
step two, statically curing the concrete product for 1.5-2 hours, covering a heat-insulating water-retaining material on the exposed surface of the product, performing air supply and steam curing after the concrete product is finally set for at least 20min at an indoor temperature of more than 5 ℃ in a static curing period of the concrete product, and ensuring that cement in the concrete is hydrated to a certain degree and has certain structural strength in the static curing stage so as to prevent the concrete from being damaged by volume expansion in the heating period; the time of the static curing stage is greatly related to the proportion of concrete, the type of cement, the time temperature of the environment, the heating rate and other factors; the long static curing time is beneficial to improving the initial structural strength of the concrete, and the long static curing time is unfavorable for the actual production efficiency; according to the invention, the static curing time is controlled to be 1.5-2 h, so that the static curing time is not too long while the initial structural strength of the concrete is ensured, and meanwhile, a structural foundation is provided for increasing the temperature rise and fall speed in the later air supply steam curing process.
Feeding gas for steam curing, entering a temperature rise stage, controlling the temperature rise speed to be 15-25 ℃/h, measuring the temperature every 30min, and adjusting the temperature rise speed by increasing and reducing the steam discharge amount of a valve according to the change condition of the temperature, wherein the temperature rise speed is positively correlated with the static curing time of the concrete product; the control of the heating rate mainly lies in adjusting the relation between the tensile strength of the interlocking block and the temperature stress generated by thermal expansion deformation, so as to avoid the concrete cracking caused by the fact that the temperature stress of the concrete exceeds the tensile strength of the interlocking block in the heating process, and when the temperature is lower, the lower heating rate is kept and controlled to be about 15 ℃/h; because the rest time of the early interlocking block ensures the structural strength of the device, the temperature rise rate can be correspondingly improved.
Step four, entering a constant temperature stage, keeping the steam curing temperature constant, controlling the constant temperature at 50-90 ℃, and keeping the constant temperature for 2-3 hours, wherein the specific time of constant temperature curing is determined through tests according to the requirements of the demolding strength of the component, the mixing proportion of the concrete, the environmental conditions and the like, the specific constant temperature is determined according to the variety of the cement, the curing temperature of the general cement is not more than 75 ℃, the curing temperature of the slag cement and the pozzolan cement is not more than 85 ℃, and when the temperature of the concrete interlocking block is overhigh in the constant temperature stage, the temperature in the shed is reduced by adopting a method of stopping supplying steam to the steam curing shed; the main control parameters of the constant temperature stage are constant temperature and constant temperature time, and for cement and concrete products, the higher the temperature and the longer the curing time of the constant temperature stage are, the faster the strength of the products develops, and the higher the strength finally obtained; however, the excessive constant temperature and the excessive heat curing time can cause the loss of the later strength of the product or the damage of other characteristics, so the selection of the proper constant temperature is very important for the steam curing process; the constant temperature is controlled to be 50-90 ℃, the constant temperature time is 2-3 hours, the maintenance temperature is differentially limited according to different cement varieties while the strength development of products is ensured, and the constant temperature and the maintenance time are ensured not to influence the structure of the interlocking block.
Step five, entering a cooling stage, and starting constant-speed cooling after the concrete product reaches the form removal strength or the tensile strength, wherein the cooling speed is controlled at 15-25 ℃/h; in the cooling stage, steam is required to be stopped slowly, the temperature is reduced uniformly, and the humidity is required to be kept; the strength of the steam-cured concrete mainly comes from the temperature rising and constant temperature stages, but the temperature lowering stage still has influences on the strength of the steam-cured concrete, the influences are mainly reflected in the temperature lowering process, the surface layer is cooled quickly, the shrinkage block is cooled slowly, the inner layer is cooled slowly, the shrinkage is slow, so that temperature difference is generated in the surface of the interlocking block, tensile stress is generated in the surface concrete, and when the tensile stress exceeds the strength of the concrete, cracks are generated in the concrete. Cracks may adversely affect the structure of the concrete, such as a decrease in structural strength, deterioration in durability, and the like; the cooling speed is controlled to be 15-25 ℃/h, a certain cooling speed can be ensured, the production efficiency is ensured, and the generation of cracks is reduced.
Removing the heat-preservation and water-retention material, discharging the concrete interlocking block out of the pool, wherein when the outdoor temperature is above 0 ℃, the difference between the temperature of the concrete interlocking block discharged out of the pool and the outdoor temperature is not more than 30 ℃; when the outdoor temperature is below 0 ℃, the difference between the temperature of the concrete interlocking block discharged from the pool and the outdoor temperature is not more than 15 ℃.
Preferably, the temperature difference between the inside and the outside of the concrete interlocking block is ensured to be not more than 15 ℃ during steam curing and when the heat preservation device is removed.
Preferably, the heat-preservation and water-retention material is cotton felt, geotextile and the like.
Compared with the prior art, the invention has the beneficial effects that:
the interlocking block is subjected to indoor steam curing, so that the interlocking block is not easily influenced by severe weather, the overall curing period is shortened, and the production efficiency is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following 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 one
The invention provides a technical scheme that: a concrete interlocking block curing method specifically comprises the following implementation steps:
step one, after a concrete mixture is subjected to a vibrating process, hoisting a concrete product with a template to a steam pool;
and step two, statically curing the concrete product for 1.5h, covering the exposed surface of the product with a heat-insulating water-retaining material, and carrying out air supply and steam curing after the concrete product is statically cured for at least 20min at the indoor temperature of more than 5 ℃ in the static curing period of the concrete product.
And thirdly, feeding gas for steam curing, entering a temperature rise stage, controlling the temperature rise speed at 15 ℃/h, measuring the temperature every 30min, and adjusting the temperature rise speed by increasing and reducing the steam discharge amount of a valve according to the change condition of the temperature, wherein the temperature rise speed is positively correlated with the static curing time of the concrete product.
And step four, entering a constant temperature stage, keeping the steam curing temperature constant, controlling the constant temperature at 50 ℃, keeping the constant temperature for 3 hours, and reducing the temperature in the steam curing shed by adopting a method of stopping supplying steam to the steam curing shed when the temperature of the concrete interlocking block is overhigh in the constant temperature stage.
Step five, entering a cooling stage, and starting constant-speed cooling after the concrete product reaches the form removal strength or the tensile strength, wherein the cooling speed is controlled at 15 ℃/h; in the cooling stage, steam is required to be stopped slowly, the temperature is reduced uniformly, and the humidity is required to be kept.
Removing the heat-preservation and water-retention material, discharging the concrete interlocking block out of the pool, wherein when the outdoor temperature is above 0 ℃, the difference between the temperature of the concrete interlocking block discharged out of the pool and the outdoor temperature is not more than 30 ℃; when the outdoor temperature is below 0 ℃, the difference between the temperature of the concrete interlocking block discharged from the pool and the outdoor temperature is not more than 15 ℃.
Wherein, during steam curing and when the heat preservation facility is removed, the temperature difference between the inside and the outside of the concrete interlocking block is ensured not to be more than 15 ℃.
The heat-insulating and water-retaining material mentioned above is typically cotton felt, geotextile, etc.
Example two
The invention provides a technical scheme that: a concrete interlocking block curing method specifically comprises the following implementation steps:
step one, after a concrete mixture is subjected to a vibrating process, hoisting a concrete product with a template to a steam pool;
and step two, statically curing the concrete product for 2 hours, covering the exposed surface of the product with a heat-insulating water-retaining material, and carrying out air supply and steam curing after the concrete product is finally set and statically curing for at least 20min at the indoor temperature of more than 5 ℃ in the static curing period of the concrete product.
And thirdly, feeding gas for steam curing, entering a temperature rise stage, controlling the temperature rise speed at 25 ℃/h, measuring the temperature every 30min, and adjusting the temperature rise speed by increasing and reducing the steam discharge amount of a valve according to the change condition of the temperature, wherein the temperature rise speed is positively correlated with the static curing time of the concrete product.
And step four, entering a constant temperature stage, keeping the steam curing temperature constant, controlling the constant temperature at 80 ℃, keeping the constant temperature for 3 hours, and reducing the temperature in the steam curing shed by adopting a method of stopping supplying steam to the steam curing shed when the temperature of the concrete interlocking block is overhigh in the constant temperature stage.
And step five, entering a cooling stage, and starting to cool at a constant speed after the concrete product reaches the form removal strength or the tensile strength, wherein the cooling speed is controlled at 25 ℃/h.
Removing the heat-preservation and water-retention material, discharging the concrete interlocking block out of the pool, wherein when the outdoor temperature is above 0 ℃, the difference between the temperature of the concrete interlocking block discharged out of the pool and the outdoor temperature is not more than 30 ℃; when the outdoor temperature is below 0 ℃, the difference between the temperature of the concrete interlocking block discharged from the pool and the outdoor temperature is not more than 15 ℃.
Wherein, during steam curing and when the heat preservation facility is removed, the temperature difference between the inside and the outside of the concrete interlocking block is ensured not to be more than 15 ℃.
The heat-insulating and water-retaining material mentioned above is typically cotton felt, geotextile, etc.
EXAMPLE III
The invention provides a technical scheme that: a concrete interlocking block curing method specifically comprises the following implementation steps:
step one, after a concrete mixture is subjected to a vibrating process, hoisting a concrete product with a template to a steam pool;
and step two, statically curing the concrete product for 1.8h, covering the exposed surface of the product with a heat-insulating and water-retaining material, and carrying out air supply and steam curing after the concrete product is statically cured for at least 20min at the indoor temperature of more than 5 ℃ in the static curing period of the concrete product.
And thirdly, feeding gas for steam curing, entering a temperature rise stage, controlling the temperature rise speed at 20 ℃/h, measuring the temperature every 30min, and adjusting the temperature rise speed by increasing and reducing the steam discharge amount of a valve according to the change condition of the temperature, wherein the temperature rise speed is positively correlated with the static curing time of the concrete product.
And step four, entering a constant temperature stage, keeping the steam curing temperature constant, controlling the constant temperature at 70 ℃, keeping the constant temperature for 2.5 hours, and reducing the temperature in the shed by adopting a method of stopping supplying steam to the steam curing shed when the temperature of the concrete interlocking block is overhigh in the constant temperature stage.
And step five, entering a cooling stage, and starting to cool at a constant speed after the concrete product reaches the form removal strength or the tensile strength, wherein the cooling speed is controlled at 20 ℃/h.
Removing the heat-preservation and water-retention material, discharging the concrete interlocking block out of the pool, wherein when the outdoor temperature is above 0 ℃, the difference between the temperature of the concrete interlocking block discharged out of the pool and the outdoor temperature is not more than 30 ℃; when the outdoor temperature is below 0 ℃, the difference between the temperature of the concrete interlocking block discharged from the pool and the outdoor temperature is not more than 15 ℃.
Wherein, during steam curing and when the heat preservation facility is removed, the temperature difference between the inside and the outside of the concrete interlocking block is ensured not to be more than 15 ℃.
The heat-insulating and water-retaining material mentioned above is typically cotton felt, geotextile, etc.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A concrete interlocking block curing method is characterized by comprising the following implementation steps:
step one, after a concrete mixture is subjected to a vibrating process, hoisting a concrete product with a template to a steam pool;
step two, statically curing the concrete product for 1.5-2 hours, and covering the exposed surface of the product with a heat-insulating water-retaining material;
feeding air for steam curing, and entering a temperature rise stage, wherein the temperature rise speed is controlled to be 15-25 ℃/h;
step four, entering a constant temperature stage, keeping the steam curing temperature constant, controlling the constant temperature at 50-90 ℃, and keeping the constant temperature for 2-3 hours;
step five, entering a cooling stage, and starting constant-speed cooling after the concrete product reaches the form removal strength or the tensile strength, wherein the cooling speed is controlled at 15-25 ℃/h;
and sixthly, removing the heat-preservation and water-retention material, and discharging the concrete interlocking blocks out of the pool.
2. A method for curing a concrete interlocking block as claimed in claim 1, wherein in step two, the room temperature is greater than 5 ℃ during the curing period of the concrete product, and the air-feeding steam curing is performed after the curing period of the concrete product is finished for at least 20 min.
3. A concrete interlocking block curing method as claimed in claim 1, wherein in step three, the temperature is measured every 30min, and the heating speed is adjusted by increasing and decreasing the valve steam release according to the temperature change.
4. A concrete interlocking block curing method as claimed in claim 3, wherein in step three, the temperature rise rate is positively correlated with the rest time of the concrete product.
5. A concrete interlocking block curing method as claimed in claim 1, wherein in step four, the specific time of constant temperature curing is determined by tests according to the member demolding strength requirement, the concrete mixing ratio condition, the environmental condition and the like.
6. A method for curing a concrete interlocking block as claimed in claim 1, wherein in the fourth step, the specific constant temperature is determined according to the cement variety, the curing temperature of general cement is not more than 75 ℃, and the curing temperature of slag cement and pozzolan cement is not more than 85 ℃.
7. A concrete interlocking block curing method as claimed in claim 6, wherein in step four, when the temperature of the concrete interlocking block is too high in the constant temperature stage, the temperature in the shed is reduced by stopping steam supply to the steam curing shed.
8. A concrete interlocking block curing method as claimed in claim 1, wherein in the sixth step, when the outdoor temperature is above 0 ℃, the temperature of the concrete interlocking block leaving the pool is not different from the outdoor temperature by more than 30 ℃; when the outdoor temperature is below 0 ℃, the difference between the temperature of the concrete interlocking block discharged from the pool and the outdoor temperature is not more than 15 ℃.
9. A method for curing a concrete interlocking block according to claim 1, wherein a difference between the inside and outside temperatures of the concrete interlocking block is not more than 15 ℃ during steam curing and when the heat insulating means is removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911120388.8A CN111098399A (en) | 2019-11-15 | 2019-11-15 | Concrete interlocking block curing method |
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| CN201911120388.8A CN111098399A (en) | 2019-11-15 | 2019-11-15 | Concrete interlocking block curing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112062601A (en) * | 2020-08-20 | 2020-12-11 | 浙江纯青节能科技有限公司 | Steam curing process for concrete prefabricated part |
| CN112192718A (en) * | 2020-09-28 | 2021-01-08 | 威海玉全新型建筑材料股份有限公司 | Forming die for cement prefabricated slab and processing technology of cement prefabricated slab |
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| US20170107727A1 (en) * | 2015-10-20 | 2017-04-20 | Michael Sipala | Poured in place concrete form |
| JP2017101389A (en) * | 2015-11-30 | 2017-06-08 | 太平洋セメント株式会社 | Concrete pavement slab and method for producing the same |
| CN107160551A (en) * | 2017-06-28 | 2017-09-15 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of cold district winter prefabricated case beam concrete construction method |
| CN110434993A (en) * | 2019-09-20 | 2019-11-12 | 长江武汉航道工程局 | A kind of curing kilns and its maintaining process for prefabricated locking plate |
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2019
- 2019-11-15 CN CN201911120388.8A patent/CN111098399A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170107727A1 (en) * | 2015-10-20 | 2017-04-20 | Michael Sipala | Poured in place concrete form |
| JP2017101389A (en) * | 2015-11-30 | 2017-06-08 | 太平洋セメント株式会社 | Concrete pavement slab and method for producing the same |
| CN107160551A (en) * | 2017-06-28 | 2017-09-15 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of cold district winter prefabricated case beam concrete construction method |
| CN110434993A (en) * | 2019-09-20 | 2019-11-12 | 长江武汉航道工程局 | A kind of curing kilns and its maintaining process for prefabricated locking plate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112062601A (en) * | 2020-08-20 | 2020-12-11 | 浙江纯青节能科技有限公司 | Steam curing process for concrete prefabricated part |
| CN112192718A (en) * | 2020-09-28 | 2021-01-08 | 威海玉全新型建筑材料股份有限公司 | Forming die for cement prefabricated slab and processing technology of cement prefabricated slab |
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