CN112707698A - C30 super-thick floor concrete and preparation method thereof - Google Patents
C30 super-thick floor concrete and preparation method thereof Download PDFInfo
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- CN112707698A CN112707698A CN202011554418.9A CN202011554418A CN112707698A CN 112707698 A CN112707698 A CN 112707698A CN 202011554418 A CN202011554418 A CN 202011554418A CN 112707698 A CN112707698 A CN 112707698A
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- 238000002360 preparation method Methods 0.000 title description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000004576 sand Substances 0.000 claims abstract description 24
- 239000004568 cement Substances 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- 238000005336 cracking Methods 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 26
- 239000004575 stone Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 8
- 239000010408 film Substances 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- 239000010409 thin film Substances 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000036571 hydration Effects 0.000 abstract description 11
- 238000006703 hydration reaction Methods 0.000 abstract description 11
- 239000002253 acid Substances 0.000 description 7
- 230000001603 reducing effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 2
- 239000010754 BS 2869 Class F Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
Classifications
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of floor slab concrete, and particularly relates to C30 super-thick floor slab concrete, wherein the thickness of the C30 super-thick floor slab concrete is more than 1m, and the concrete comprises the following raw materials in parts by weight: 166 parts of 164-class water, 310 parts of 270-class cement, 60-85 parts of I-class fly ash, 850 parts of 700-class sand, 1080 parts of 1050-class gravel, 5-7 parts of a water reducing agent and 30-34 parts of an anti-cracking agent; according to the invention, through reasonable raw material proportion, the hydration heat generated by the poured concrete is lower, the temperature difference between the inside and the outside of the C30 super-thick floor concrete is small, and the possibility of crack generation of the super-thick floor concrete is reduced; meanwhile, the crack resistance agent is added, so that the possibility of crack generation of the super-thick floor concrete is further reduced, the prepared C30 super-thick floor concrete has the advantages of high strength and high resistance, the durability, the bearing capacity and the service life of the concrete are improved, and the use safety of concrete buildings is improved.
Description
Technical Field
The invention relates to the technical field of floor slab concrete, in particular to C30 super-thick floor slab concrete and a preparation method thereof.
Background
In some special buildings, ultra-thick floor slab concrete with the thickness of more than 1m is required, and the ultra-thick floor slab concrete structure belongs to a special large-volume concrete structure. At present, in the pouring process of the super-thick floor slab concrete during preparation, hydration heat is easy to generate, so that local temperature difference is too large, cracks are generated, the performance of the concrete is reduced, the durability and the bearing capacity of the concrete are reduced, and if the cracks appear in important parts of a building structure, the safety of the building is even damaged.
Disclosure of Invention
The invention aims to provide C30 super-thick floor slab concrete with low possibility of crack generation.
The technical scheme adopted by the invention for solving the technical problems is as follows: c30 super thick type floor concrete, the thickness of C30 super thick type floor concrete is greater than 1m, its characterized in that: the material comprises the following raw materials in parts by weight: 166 parts of 164-class water, 310 parts of 270-class cement, 60-85 parts of I-class fly ash, 850 parts of 700-class sand, 1080 parts of 1050-class gravel, 5-7 parts of a water reducing agent and 30-34 parts of an anti-cracking agent.
Further, the cement is low heat portland cement.
Furthermore, the sand is natural medium sand, the fineness modulus of the natural medium sand is between 2.9 and 2.5, and the mud content is less than 2 percent.
Furthermore, the crushed stones comprise small-particle-size graded crushed stones with the particle size of 4.75-9.5mm and large-particle-size graded crushed stones with the particle size of 9.5-26.5 mm.
In addition, the invention also aims to solve the technical problem of providing a preparation method of the C30 super-thick floor slab concrete with low possibility of crack generation.
The preparation method of the C30 super-thick floor slab concrete comprises the following steps:
a. pouring sand, gravel and stirring water into a stirrer, and uniformly stirring to obtain a first mixture, wherein the temperature of the stirring water is 0-10 ℃;
b. sequentially adding cement, I-grade fly ash, a water reducing agent and an anti-cracking agent into the first mixture, and uniformly stirring to obtain a second mixture;
c. and finally, pouring the slurry of the second mixture into the steel film, and maintaining after pouring, wherein during maintenance, the internal temperature of the concrete is not higher than 70 ℃, and the temperature difference between the internal surface and the external surface of the concrete is less than 25 ℃.
Further, in step b, the stirring time was 3 min.
Further, in step c, the surface of the concrete is maintained to be wet by covering a thin film and felt on the surface of the poured concrete and watering in time for curing.
Further, in step c, the curing time was 14 d.
The invention has the beneficial effects that: according to the invention, through reasonable raw material proportion, the hydration heat generated by the poured concrete is lower, the temperature difference between the inside and the outside of the C30 super-thick floor concrete is small, and the possibility of crack generation of the super-thick floor concrete is reduced; meanwhile, the crack resistance agent is added, so that the possibility of crack generation of the super-thick floor concrete is further reduced, the prepared C30 super-thick floor concrete has the advantages of high strength and high resistance, the durability, the bearing capacity and the service life of the concrete are improved, and the use safety of concrete buildings is improved.
The preparation method of the C30 ultra-thick floor concrete is simple and convenient to implement, during preparation, the temperature of stirring water is 0-10 ℃ in the stirring process, partial heat generated by hydration and heat release of cement can be absorbed in the stirring process, partial temperature can be adjusted, the generation of cracks is favorably controlled, in addition, in the maintenance process, the internal temperature of the concrete is not higher than 70 ℃, the temperature difference between the internal part and the external surface of the concrete is less than 25 ℃, the generation of cracks is effectively reduced, and the performance of the C30 ultra-thick floor concrete is ensured.
Detailed Description
The invention relates to C30 super-thick floor concrete, wherein the thickness of the C30 super-thick floor concrete is more than 1m, and the concrete comprises the following raw materials in parts by weight: 166 parts of 164-class water, 310 parts of 270-class cement, 60-85 parts of I-class fly ash, 850 parts of 700-class sand, 1080 parts of 1050-class gravel, 5-7 parts of a water reducing agent and 30-34 parts of an anti-cracking agent.
According to a large number of practices and experiments, the raw material proportion of the invention is adopted, so that the hydration heat generated by the poured concrete is lower, the temperature difference between the inside and the outside of the C30 super-thick floor concrete is small, and the possibility of crack generation of the super-thick floor concrete is reduced; meanwhile, the crack resistance agent is added, so that the possibility of crack generation of the super-thick floor concrete is further reduced, the prepared C30 super-thick floor concrete has the advantages of high strength and high resistance, the durability, the bearing capacity and the service life of the concrete are improved, and the use safety of concrete buildings is improved.
Specifically, the cement is preferably low-heat silicate cement P.LH42.5, the hydration heat of the cement 3d is not higher than 230kj/kg, and the hydration heat of the cement 7d is not higher than 260 kj/kg. The class I fly ash is preferably class F class I fly ash, has the function of replacing cement, can effectively reduce the using amount of the cement, thereby achieving the function of reducing the hydration heat of concrete, improving the workability of the concrete and improving the durability of the concrete. The sand is preferably natural medium sand, the fineness modulus of the natural medium sand is between 2.9 and 2.5, the mud content is less than 2 percent, the mud block content is less than 0.7 percent, and the gradation is good. The macadam comprises small-particle-size graded macadam with the particle size of 4.75-9.5mm and large-particle-size graded macadam with the particle size of 9.5-26.5mm, wherein the content of needle and flaky particles is less than 5%, the content of harmful substances is less than 0.5%, the grading of sand and stone is good, the sand rate is moderate, and the strength of concrete can be improved and the hydration heat of the concrete can be reduced by strictly controlling the content of needle, flaky particles and harmful substances. The water reducing agent is preferably a polycarboxylic acid water reducing agent, has long retarding time and good water reducing effect, can effectively improve the working performance of concrete, greatly reduces the using amount of mixing water, has the water reducing effect of more than 25 percent, saves cement and further achieves the effect of reducing hydration heat. The anticracking agent is preferably high-efficiency expanding anticracking waterproof agent, and has water bleeding rate of 62%, expansion limiting rate of 0.039% in water for 7 days and 0.01% in air for 21 days.
The preparation method of the C30 super-thick floor slab concrete comprises the following steps:
a. pouring sand, gravel and stirring water into a stirrer, and uniformly stirring to obtain a first mixture, wherein the temperature of the stirring water is 0-10 ℃;
b. sequentially adding cement, I-grade fly ash, a water reducing agent and an anti-cracking agent into the first mixture, and uniformly stirring to obtain a second mixture;
c. and finally, pouring the slurry of the second mixture into the steel film, and curing for 14d after pouring, wherein the internal temperature of the concrete is not higher than 70 ℃ and the temperature difference between the internal surface and the external surface of the concrete is less than 25 ℃ during curing.
The temperature of the stirring water is 0-10 ℃, partial heat released by hydration of cement can be absorbed in the stirring process, the adjustment of partial temperature is realized, the generation of cracks is favorably controlled, in addition, in the maintenance process, the internal temperature of the concrete is not higher than 70 ℃, the temperature difference between the inside and the outer surface of the concrete is less than 25 ℃, the generation of cracks is effectively reduced, and the performance of the C30 super-thick floor concrete is ensured.
In step b, the stirring time is preferably 3 min. And c, after the slurry of the second mixture is poured into the steel film, checking whether the steel bar deviates or not, correcting in time, and after pouring is finished, maintaining by covering a thin film and a felt on the surface of the poured concrete and watering in time to keep the surface of the concrete moist.
Example one
The C30 super-thick floor concrete comprises the following raw materials: according to the mass parts, 165 parts of water, 280 parts of cement, 65 parts of I-grade fly ash, 799 parts of medium sand, 1061 parts of crushed stone, 6.0 parts of polycarboxylic acid water reducing agent and 30.1 parts of anti-cracking agent.
The preparation method of the C30 super-thick floor concrete of the raw materials comprises the following steps:
a. pouring 799 parts of medium sand, 1061 parts of broken stone and 165 parts of stirring water into a stirrer, and uniformly stirring to obtain a first mixture, wherein the temperature of the stirring water is 5 ℃;
b. and sequentially adding 280 parts of cement, 65 parts of I-grade fly ash, 6.0 parts of polycarboxylic acid water reducing agent and 30.1 parts of anti-cracking agent into the first mixture, and uniformly stirring to obtain a second mixture, wherein the stirring time is 3 min.
c. And finally, pouring the slurry of the second mixture into a steel film, checking whether the steel bar deviates after the concrete is poured to reach the elevation, correcting in time, after pouring is finished, maintaining by covering a thin film and a felt on the surface of the poured concrete and watering in time to keep the surface of the concrete moist, wherein the maintaining time is 14d, and during the maintaining period, the internal temperature of the concrete is not higher than 70 ℃, and the temperature difference between the internal surface and the external surface of the concrete is less than 25 ℃.
Example two
The C30 super-thick floor concrete comprises the following raw materials: according to the mass parts, 165 parts of water, 289 parts of cement, 72 parts of I-grade fly ash, 744 parts of medium sand, 1068 parts of crushed stone, 6.3 parts of polycarboxylic acid water reducing agent and 32 parts of anti-cracking agent.
The preparation method of the C30 super-thick floor concrete of the raw materials comprises the following steps:
a. pouring 744 parts of medium sand, 1068 parts of broken stone and 165 parts of stirring water into a stirrer, and uniformly stirring to obtain a first mixture, wherein the temperature of the stirring water is 6 ℃;
b. 289 parts of cement, 72 parts of I-grade fly ash, 6.3 parts of polycarboxylic acid water reducing agent and 32 parts of anti-cracking agent are sequentially added into the first mixture, and the mixture is uniformly stirred to obtain a second mixture, wherein the stirring time is 3 min.
c. And finally, pouring the slurry of the second mixture into a steel film, checking whether the steel bar deviates after the concrete is poured to reach the elevation, correcting in time, after pouring is finished, maintaining by covering a thin film and a felt on the surface of the poured concrete and watering in time to keep the surface of the concrete moist, wherein the maintaining time is 14d, and during the maintaining period, the internal temperature of the concrete is not higher than 70 ℃, and the temperature difference between the internal surface and the external surface of the concrete is less than 25 ℃.
EXAMPLE III
The C30 super-thick floor concrete comprises the following raw materials: according to the mass parts, 165 parts of water, 303 parts of cement, 76 parts of I-grade fly ash, 747 parts of medium sand, 1076 parts of gravel, 6.6 parts of polycarboxylic acid water reducing agent and 33 parts of anti-cracking agent.
The preparation method of the C30 super-thick floor concrete of the raw materials comprises the following steps:
a. 747 parts of medium sand, 1076 parts of broken stone and 165 parts of stirring water are poured into a stirrer and are uniformly stirred to obtain a first mixture, wherein the temperature of the stirring water is 5 ℃;
b. and sequentially adding 303 parts of cement, 76 parts of I-grade fly ash, 6.6 parts of polycarboxylic acid water reducing agent and 33 parts of anti-cracking agent into the first mixture, and uniformly stirring to obtain a second mixture, wherein the stirring time is 3 min.
c. And finally, pouring the slurry of the second mixture into a steel film, checking whether the steel bar deviates after the concrete is poured to reach the elevation, correcting in time, after pouring is finished, maintaining by covering a thin film and a felt on the surface of the poured concrete and watering in time to keep the surface of the concrete moist, wherein the maintaining time is 14d, and during the maintaining period, the internal temperature of the concrete is not higher than 70 ℃, and the temperature difference between the internal surface and the external surface of the concrete is less than 25 ℃.
The concrete prepared in the first, second and third examples has no crack, and the obtained C30 super-thick floor concrete has good performance, and the main performance is shown in the following table:
Claims (8)
- c30 super thick type floor concrete, the thickness of C30 super thick type floor concrete is greater than 1m, its characterized in that: the material comprises the following raw materials in parts by weight: 166 parts of 164-class water, 310 parts of 270-class cement, 60-85 parts of I-class fly ash, 850 parts of 700-class sand, 1080 parts of 1050-class gravel, 5-7 parts of a water reducing agent and 30-34 parts of an anti-cracking agent.
- 2. The C30 extra-thick floor concrete of claim 1, wherein: the cement is low-heat portland cement.
- 3. The C30 extra-thick floor concrete of claim 1, wherein: the sand is natural medium sand, the fineness modulus of the natural medium sand is between 2.9 and 2.5, and the mud content is less than 2 percent.
- 4. The C30 extra-thick floor concrete of claim 1, wherein: the crushed stone comprises small-particle-size graded crushed stone with the particle size of 4.75-9.5mm and large-particle-size graded crushed stone with the particle size of 9.5-26.5 mm.
- 5. The method for preparing C30 ultra-thick floor slab concrete as claimed in any one of claims 1 to 4, comprising the steps of:a. pouring sand, gravel and stirring water into a stirrer, and uniformly stirring to obtain a first mixture, wherein the temperature of the stirring water is 0-10 ℃;b. sequentially adding cement, I-grade fly ash, a water reducing agent and an anti-cracking agent into the first mixture, and uniformly stirring to obtain a second mixture;c. and finally, pouring the slurry of the second mixture into the steel film, and maintaining after pouring, wherein during maintenance, the internal temperature of the concrete is not higher than 70 ℃, and the temperature difference between the internal surface and the external surface of the concrete is less than 25 ℃.
- 6. The method for preparing C30 ultra-thick floor slab concrete as claimed in claim 5, wherein: in step b, the stirring time was 3 min.
- 7. The method for preparing C30 ultra-thick floor slab concrete as claimed in claim 5, wherein: in step c, the surface of the concrete is maintained to be moist by covering a thin film and felt on the surface of the poured concrete and watering in time for maintenance.
- 8. The method for preparing C30 ultra-thick floor slab concrete as claimed in claim 5, wherein: in step c, the curing time was 14 d.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011554418.9A CN112707698A (en) | 2020-12-24 | 2020-12-24 | C30 super-thick floor concrete and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011554418.9A CN112707698A (en) | 2020-12-24 | 2020-12-24 | C30 super-thick floor concrete and preparation method thereof |
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| CN102425307A (en) * | 2011-10-19 | 2012-04-25 | 江苏瑞峰建设集团有限公司 | Casting method for avoiding formation of mass concrete cracks |
| KR101334319B1 (en) * | 2013-04-24 | 2013-11-29 | (주)콘스타 | An nvironment-friendly soil concrete composite material and paving method using it |
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2020
- 2020-12-24 CN CN202011554418.9A patent/CN112707698A/en active Pending
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Effective date of registration: 20210916 Address after: 610091 building 10, 218 Jingye Road, Qingyang District, Chengdu City, Sichuan Province Applicant after: CHINA 19TH METALLURGICAL CORPORATION CHENGDU CONSTRUCTION Co.,Ltd. Applicant after: CHINA 19TH METALLURGICAL GROUP Co.,Ltd. Address before: CHINA 19TH METALLURGICAL GROUP Co.,Ltd. Applicant before: CHINA 19TH METALLURGICAL GROUP Co.,Ltd. |
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Application publication date: 20210427 |