CN112521100A - Ultra-thick wall concrete and preparation method and construction method thereof - Google Patents
Ultra-thick wall concrete and preparation method and construction method thereof Download PDFInfo
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- CN112521100A CN112521100A CN202011496895.4A CN202011496895A CN112521100A CN 112521100 A CN112521100 A CN 112521100A CN 202011496895 A CN202011496895 A CN 202011496895A CN 112521100 A CN112521100 A CN 112521100A
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- 239000004567 concrete Substances 0.000 title claims abstract description 129
- 238000010276 construction Methods 0.000 title abstract description 24
- 238000002360 preparation method Methods 0.000 title abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000004575 stone Substances 0.000 claims abstract description 23
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 239000004576 sand Substances 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 6
- 239000010408 film Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000010409 thin film Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- 238000006703 hydration reaction Methods 0.000 abstract description 9
- 230000036571 hydration Effects 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 238000009529 body temperature measurement Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000003469 silicate cement Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- 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
- 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
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- 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 concrete materials, and particularly relates to super-thick wall concrete and a preparation method and a construction method thereof. The invention aims to solve the technical problem of providing the ultra-thick wall concrete and the preparation method and the construction process thereof, so as to solve the problem of cracks generated by the ultra-thick wall concrete due to temperature difference. The super-thick wall concrete is prepared from the following raw materials in parts by weight: 270-320 parts of cement, 60-90 parts of fly ash, 800-840 parts of sand, 1050-1080 parts of broken stone, 161-163 parts of water and 5-7 parts of water reducing agent. The thickness of the ultra-thick wall body poured by the concrete can reach 2.4-3 m, the volume change caused by the hydration heat of the ultra-thick wall body concrete is fundamentally improved, and the problem of cracks commonly existing in the ultra-thick wall body concrete is solved.
Description
Technical Field
The invention belongs to the technical field of concrete materials, and particularly relates to super-thick wall concrete and a preparation method and a construction method thereof.
Background
The concrete has the advantages of high quality, low price, convenient construction, strong plasticity, large bearing capacity and the like, and is unique in modern facilities and buildings. With the development of national economy and construction technology, the application of large-volume concrete in modern buildings is more and more extensive, such as foundations of high-rise buildings, hospitals, water conservancy dams, large bridges and the like. The ultra-thick concrete wall with the thickness of more than 1m is needed in some buildings, the ultra-thick concrete wall belongs to a special concrete structure, and the large-volume concrete is defined as follows according to the large-volume concrete construction standard (GB 50496-2018): mass concrete of concrete structure entity minimum size not less than 1m, or concrete expected to cause harmful crack generation due to temperature change and shrinkage caused by hydration of cement material in concrete.
The super-thick wall concrete structure belongs to a special large-volume concrete structure, has a similarity with large-volume concrete and has great difference. The production difficulty is mainly that the hydration heat generated by the mass concrete cement easily causes overlarge local temperature difference to further cause cracks, and the mass concrete is easy to generate shrinkage effect and also can generate cracks in the cooling process. Once cracks are generated, the performance of concrete is greatly influenced, 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.
At present, the existing method for controlling the generation of cracks in mass concrete mainly controls the temperature by adding a heat preservation cooling device, thereby achieving the effect of reducing the cracks. For example, patent document CN108049644B discloses a temperature control device and a temperature control method for mass concrete with dual condensing loops, which can reduce the internal temperature of mass concrete and reduce the internal gap of mass concrete by delivering cooling liquid to a condensing tube buried in the concrete.
However, the following problems exist in controlling the internal and external temperature difference of the mass concrete by adopting the condensing equipment: (1) the ultra-thick wall concrete is mainly applied to buildings with special use functions, and although the ultra-thick wall concrete has similar parts with large-volume concrete, higher requirements are provided, such as no visible crack can appear; (2) the surface area of the ultra-thick wall concrete is larger, so that the heat dissipation is fast, higher requirements are provided for the control of the internal and external temperature difference of the concrete, and the construction difficulty is high; (3) the exposure time of the ultra-thick large-volume concrete in the air is longer, which puts higher requirements on the maintenance of the concrete; (4) the existing methods for controlling the internal and external temperature difference of mass concrete are complex, high in construction cost, large in technical difficulty and long in construction period.
The ultra-thick wall concrete structure belongs to a special structure form, the research specially aiming at the aspect is few, at present, domestic research mainly focuses on the aspect of common mass concrete, which directly causes the deficiency of related guiding technologies and restricts the development of structural design and construction in building engineering, therefore, the ultra-thick wall concrete structure has important guiding significance and engineering value for the research of ultra-thick wall concrete.
Disclosure of Invention
The invention aims to solve the technical problem of providing the ultra-thick wall concrete and the preparation method and the construction process thereof, so as to solve the problem of cracks generated by the ultra-thick wall concrete due to temperature difference.
The invention provides ultra-thick wall concrete for solving the technical problems. The super-thick wall concrete is prepared from the following raw materials in parts by weight: 270-320 parts of cement, 60-90 parts of fly ash, 800-840 parts of sand, 1050-1080 parts of broken stone, 161-163 parts of water and 5-7 parts of water reducing agent.
Further, the cement is low-heat portland cement.
Further, the fly ash is F-class I-grade fly ash.
Furthermore, the sand is natural medium sand, the fineness modulus of the sand is 2.9-2.5, the mud content is less than 2%, and the mud block content is less than 0.7%.
Furthermore, the crushed stones comprise graded crushed stones with the grain size of 4.75-9.5 mm and graded crushed stones with the grain size of 9.5-26.5 mm.
Furthermore, the mass percentage of the graded broken stone with the particle size of 4.75-9.5 mm is 10-30%; the mass ratio of the graded broken stones with the grain diameters of 9.5-26.5 mm is 70-90%.
Further, the water reducing agent is a polycarboxylic acid water reducing agent.
The invention also provides a preparation method of the super-thick wall concrete, which comprises the steps of mixing and stirring the sand, the broken stone and the water with the temperature of 0-10 ℃ uniformly to obtain a mixture, and sequentially adding the cement, the fly ash and the water reducing agent into the mixture to be stirred uniformly to obtain the concrete.
The invention also provides a construction method of the super-thick wall concrete, which comprises the steps of pouring the concrete into a steel film, covering a thin film and felt after pouring, watering and curing, controlling the relative humidity of the concrete to be more than 95 percent, controlling the temperature of the concrete to be not higher than 70 ℃, and curing for 14 days.
The invention has the beneficial effects that:
the thickness of the concrete-poured super-thick wall body prepared from the raw materials according to a certain proportion can reach 2.4-3 m, and the concrete-poured super-thick wall body can be applied to buildings with special requirements such as hospitals, bridges and super high-rise buildings. The concrete of the invention enables the wall body to have the advantages of high strength and high resistance, the strength can reach 40MPa after 28 days, the durability and the bearing capacity of the concrete member can be improved, the service life is prolonged, and the use safety of the concrete building is improved. The construction method of the concrete is simple, the quality performance of the concrete of the ultra-thick wall body can be effectively ensured, and the construction efficiency is improved.
Drawings
FIG. 1 is a graph showing temperature measurements of concrete prepared in example 2 of the present invention.
Detailed Description
The invention particularly provides super-thick wall concrete which is prepared from the following raw materials in parts by weight: 270-320 parts of cement, 60-90 parts of fly ash, 800-840 parts of sand, 1050-1080 parts of broken stone, 161-163 parts of water and 5-7 parts of water reducing agent.
According to the invention, low-heat portland cement is added during preparation of concrete, so that the hydration heat of the concrete can be effectively reduced, the temperature of the concrete is reduced, sand and gravel are added as framework materials of the concrete, the effects of filling, force transmission and hydration heat reduction are achieved, a water reducing agent is added to reduce the addition amount of water, the water consumption of the concrete can be effectively reduced due to the water reducing effect of the added fly ash, the water-cement ratio is reduced, the compressive strength of the concrete is improved, the hydration reaction of the cement can be further delayed due to the added fly ash, the hydration heat is reduced, the performances of slump, slump loss, fluidity, bleeding property and the like of the concrete can be improved, the construction and the pouring of the super-thick concrete under the high-temperature weather condition are facilitated, and the generation of temperature cracks is further reduced.
The concrete prepared by the raw materials according to the proportion generates lower hydration heat after being poured, so that the temperature difference between the inside and the outside of the wall body is small, the volume change caused by the hydration heat of the ultra-thick wall body concrete is fundamentally improved, and the problem of cracks commonly existing in the ultra-thick wall body concrete is solved.
Wherein, the water adopted by the invention is concrete mixing water, and the quality meets the relevant regulations of the existing industry standard JGJ 63; the cement is P.LH42.5 low-heat portland cement; the fly ash is F-class I-grade fly ash; the sand is natural medium sand; the water reducing agent is a polycarboxylic acid water reducing agent.
The invention also provides a preparation method of the super-thick wall concrete, which comprises the steps of mixing and stirring the sand, the broken stone and the water with the temperature of 0-10 ℃ uniformly to obtain a mixture, and sequentially adding the cement, the fly ash and the water reducing agent into the mixture to be stirred uniformly to obtain the concrete. The preparation method of the concrete is simple, the temperature of water is controlled to be 0-10 ℃ in the mixing process of the raw materials, so that the mixture absorbs partial heat in the cementing and heat releasing process, the temperature is adjusted, and cracks are avoided.
The invention also provides a construction method of the super-thick wall concrete, which comprises the steps of pouring the concrete into a steel film, covering a thin film and felt after pouring, watering and curing, controlling the relative humidity of the concrete to be more than 95 percent, controlling the temperature of the concrete to be not higher than 70 ℃, and curing for 14 days. The construction method of the concrete has small difficulty, not only can effectively ensure the quality performance of the concrete of the ultra-thick wall body, but also improves the construction efficiency.
The present invention will be further illustrated by the following specific examples.
Example 1
In the embodiment, the raw materials are as follows by weight: P.LH42.5 low-heat silicate cement 276 parts, I-grade fly ash 69 parts, medium sand 833 parts, crushed stone 1060 parts, water 162 parts and polycarboxylic acid water reducing agent 5.6 parts.
The preparation method comprises the following steps: and mixing 833 parts of medium sand, 1060 parts of broken stone and 162 parts of water at 5 ℃ uniformly to obtain a mixture, and sequentially adding 276 parts of P.LH42.5 low-heat portland cement, 69 parts of I-grade fly ash and 5.6 parts of a water reducing agent to the mixture and uniformly stirring to obtain the concrete.
The construction method comprises the following steps: and pouring the mixed concrete slurry into a steel film, checking whether the steel bar deviates after the concrete reaches the elevation, correcting in time, covering a thin film and a felt after pouring, watering and curing in time to keep the surface of the concrete moist, wherein the curing time is 14 days, and during the curing, the internal temperature of the concrete is kept to be not higher than 70 ℃, and the temperature difference between the internal surface and the external surface of the concrete is less than 25 ℃.
Example 2
In the embodiment, the raw materials are as follows by weight: 295 parts of low-heat silicate cement P.LH42.5, 64 parts of I-grade fly ash, 807 parts of medium sand, 1071 parts of crushed stone, 162 parts of water and 5.8 parts of polycarboxylic acid water reducing agent.
The preparation method comprises the following steps: 807 parts of medium sand, 1071 parts of crushed stone and 162 parts of water at 5 ℃ are mixed and stirred uniformly to obtain a mixture, 295 parts of P.LH42.5 low-heat portland cement, 64 parts of I-grade fly ash and 5.8 parts of water reducing agent are sequentially added into the obtained mixture and stirred uniformly to obtain the concrete.
The construction method comprises the following steps: and pouring the mixed concrete slurry into a steel film, checking whether the steel bar deviates after the concrete reaches the elevation, correcting in time, covering a thin film and a felt after pouring, watering and curing in time to keep the surface of the concrete moist, wherein the curing time is 14 days, and during the curing, the internal temperature of the concrete is kept to be not higher than 70 ℃, and the temperature difference between the internal surface and the external surface of the concrete is less than 25 ℃.
Example 3
In the embodiment, the raw materials are as follows by weight: P.LH42.5 low-heat silicate cement 316 parts, I-grade fly ash 60 parts, medium sand 800 parts, crushed stone 1061 parts, water 162 parts and polycarboxylic acid water reducing agent 6.0 parts.
The preparation method comprises the following steps: mixing 800 parts of medium sand, 1061 parts of broken stone and 162 parts of water at 5 ℃ and uniformly stirring to obtain a mixture, and sequentially adding 316 parts of P.LH42.5 low-heat portland cement, 60 parts of I-grade fly ash and 6.0 parts of a water reducing agent into the mixture and uniformly stirring to obtain the concrete.
The construction method comprises the following steps: and pouring the mixed concrete slurry into a steel film, checking whether the steel bar deviates after the concrete reaches the elevation, correcting in time, covering a thin film and a felt after pouring, watering and curing in time to keep the surface of the concrete moist, wherein the curing time is 14 days, and during the curing, the internal temperature of the concrete is kept to be not higher than 70 ℃, and the temperature difference between the internal surface and the external surface of the concrete is less than 25 ℃.
The mechanical properties of the ultra-thick wall concrete prepared in examples 1 to 3 are shown in table 1.
TABLE 1 mechanical property results of ultra-thick wall concrete prepared in examples 1-3
The ultra-thick wall concrete prepared in example 2 is subjected to temperature test according to the relevant requirements of the temperature measurement and control technical specification for mass concrete (GB/T51028-2015), and the temperature of the relevant temperature measurement points is shown in FIG. 1. The point 5 is the ambient temperature, the point 4 is the concrete central temperature, the points 2 and 3 are the temperatures of the middle upper part and the middle lower part of the concrete, and the points 1 and 6 are the temperatures of the concrete surface layer parts. As can be seen from FIG. 1, the maximum temperature of the concrete is 61.9 ℃, the maximum temperature is located in the center of the concrete, and the difference between the temperature of the center and the temperature of the edge is less than 25 ℃ within 7 days, so that the related requirements can be met. As can be seen from Table 1, the ultra-thick wall concrete provided by the invention has good compressive strength and workability, and no obvious crack is found after the concrete prepared in examples 1-3 is cured for 14 days after construction, which proves that the anti-cracking performance of the concrete is good.
Claims (9)
1. Super thick type wall body concrete, its characterized in that: the composite material is prepared from the following raw materials in parts by weight: 270-320 parts of cement, 60-90 parts of fly ash, 800-840 parts of sand, 1050-1080 parts of broken stone, 161-163 parts of water and 5-7 parts of water reducing agent.
2. The ultra-thick wall concrete according to claim 1, wherein: the cement is low-heat portland cement.
3. The ultra-thick type wall concrete according to claim 1 or 2, wherein: the fly ash is F-class I-grade fly ash.
4. The ultra-thick wall concrete according to any one of claims 1 to 3, wherein: the fineness modulus of the sand is 2.9-2.5, the mud content is less than 2%, and the mud block content is less than 0.7%.
5. The ultra-thick wall concrete according to any one of claims 1 to 4, wherein: the crushed stone comprises graded crushed stone with the grain diameter of 4.75-9.5 mm and graded crushed stone with the grain diameter of 9.5-26.5 mm.
6. The ultra-thick wall concrete according to claim 5, wherein: the mass ratio of the graded broken stones with the particle size of 4.75-9.5 mm is 10-30%; the mass ratio of the graded broken stones with the grain diameters of 9.5-26.5 mm is 70-90%.
7. The ultra-thick wall concrete according to any one of claims 1 to 6, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.
8. The method for preparing ultra-thick wall concrete according to any one of claims 1 to 7, characterized in that: and mixing and stirring the sand, the broken stone and water at 0-10 ℃ uniformly to obtain a mixture, and sequentially adding the cement, the fly ash and the water reducing agent into the mixture to be stirred uniformly to obtain the concrete.
9. The method for constructing ultra-thick wall concrete according to any one of claims 1 to 7, characterized in that: pouring concrete into the steel film, covering a thin film and a felt after pouring, watering and curing, controlling the relative humidity of the concrete to be more than 95 percent, controlling the temperature of the concrete to be not higher than 70 ℃, and curing for 14 days.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296819A (en) * | 2011-06-15 | 2011-12-28 | 四川路桥建设股份有限公司 | Construction method for mass pipe concrete without temperature reduction |
| CN103936360A (en) * | 2014-03-17 | 2014-07-23 | 乌海市公路工程有限公司 | High-performance concrete and its preparation method |
| CN105801053A (en) * | 2016-03-16 | 2016-07-27 | 武汉源锦商品混凝土有限公司 | Self-compacting concrete with high content of fly ash C40 |
| CN106565161A (en) * | 2016-11-05 | 2017-04-19 | 中国路桥工程有限责任公司 | Anti-cracking concrete and preparation method thereof |
| CN107313463A (en) * | 2017-04-06 | 2017-11-03 | 江苏苏博特新材料股份有限公司 | Urban subway station agent structure side wall concrete crack control method |
| CN109369097A (en) * | 2018-11-08 | 2019-02-22 | 中国核工业华兴建设有限公司 | A kind of low cracking resistance mass concrete of high performance of creeping of lower shrinkage |
-
2020
- 2020-12-17 CN CN202011496895.4A patent/CN112521100A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296819A (en) * | 2011-06-15 | 2011-12-28 | 四川路桥建设股份有限公司 | Construction method for mass pipe concrete without temperature reduction |
| CN103936360A (en) * | 2014-03-17 | 2014-07-23 | 乌海市公路工程有限公司 | High-performance concrete and its preparation method |
| CN105801053A (en) * | 2016-03-16 | 2016-07-27 | 武汉源锦商品混凝土有限公司 | Self-compacting concrete with high content of fly ash C40 |
| CN106565161A (en) * | 2016-11-05 | 2017-04-19 | 中国路桥工程有限责任公司 | Anti-cracking concrete and preparation method thereof |
| CN107313463A (en) * | 2017-04-06 | 2017-11-03 | 江苏苏博特新材料股份有限公司 | Urban subway station agent structure side wall concrete crack control method |
| CN109369097A (en) * | 2018-11-08 | 2019-02-22 | 中国核工业华兴建设有限公司 | A kind of low cracking resistance mass concrete of high performance of creeping of lower shrinkage |
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