CN111039618A - Low-electric-flux fiber concrete for large volume of maritime work and preparation method thereof - Google Patents

Low-electric-flux fiber concrete for large volume of maritime work and preparation method thereof Download PDF

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Publication number
CN111039618A
CN111039618A CN201911297373.9A CN201911297373A CN111039618A CN 111039618 A CN111039618 A CN 111039618A CN 201911297373 A CN201911297373 A CN 201911297373A CN 111039618 A CN111039618 A CN 111039618A
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CN
China
Prior art keywords
volume
concrete
fiber concrete
water
fiber
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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
Application number
CN201911297373.9A
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Chinese (zh)
Inventor
何彦琪
李曦
冷政
王军
李蒙强
曾维
张圆
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China West Construction Group Co Ltd
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China West Construction Group Co Ltd
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Application filed by China West Construction Group Co Ltd filed Critical China West Construction Group Co Ltd
Priority to CN201911297373.9A priority Critical patent/CN111039618A/en
Publication of CN111039618A publication Critical patent/CN111039618A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/24Sea water resistance
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34Non-shrinking or non-cracking materials
    • C04B2111/343Crack resistant materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention provides a low-electric-flux fiber concrete for large volume of maritime works and a preparation method thereof, and the components of the fiber concrete for large volume of maritime works comprise: cement, fly ash, mineral powder, water, sand, gravel, a water reducing agent and flexible fibers; the mass ratio of each component is as follows: 8.5-11.5% of cement, 2-4% of fly ash, 2.5-3.5% of mineral powder, 5.0-6.5% of water, 29-33% of sand, 6-13% of medium crushed stone, 0.3-0.42% of water reducing agent, 0.03-0.05% of flexible fiber and the balance of small crushed stone, wherein the total mass percentage of each component is 100%. The invention is used for marine large-volume fiber concrete. Compared with common concrete, the concrete has obviously improved compressive strength, adiabatic temperature rise and electric flux.

Description

Low-electric-flux fiber concrete for large volume of maritime work and preparation method thereof
Technical Field
The invention relates to the technical field of concrete materials, in particular to a large-volume low-electric-flux fiber concrete for maritime work and a preparation method thereof.
Background
The marine large-volume concrete as the large-volume concrete firstly faces the problem of high adiabatic temperature rise of the concrete, the early hydration rate of the ordinary portland cement is high, the hydration heat release rate is high, and the large temperature difference is formed inside and outside the concrete so as to form temperature tensile stress, thereby causing the concrete to crack. Secondly, marine concrete faces the chloride ion erosion problem, and the chloride ion invasion concrete arrival reinforcing bar surface can make the reinforcing bar corrosion, and the local volume expansion of reinforcing bar leads to the concrete fracture for the structure inefficacy. Therefore, the concrete with low early hydration temperature rise and higher chloride ion permeability resistance needs to be designed, and the high durability of the large-volume marine concrete is ensured.
Although there are many construction measures in the engineering to reduce hydration temperature rise, such as adopting medium and low heat cement, concrete adding ice chip, cooling water pipe, etc. But safety and durability problems are caused by low early concrete fracture toughness, the formation of cracks and the continued propagation of cracks due to seawater impact and the like. Therefore, the early crack resistance and toughness of the reinforced concrete need to be considered, and the method has important significance for the high durability of the marine structure.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-electric-flux fiber concrete for large volume of maritime works and a preparation method thereof, and aims to solve the problems of insufficient crack resistance and insufficient chloride ion permeability of the existing large volume of maritime works concrete.
The invention provides a marine large-volume low-electric-flux fiber concrete, which comprises the following components: cement, fly ash, mineral powder, water, sand, gravel and a water reducing agent; wherein the mass ratio of each component is as follows: 8.5-11.5% of cement, 2-4% of fly ash, 2.5-3.5% of mineral powder, 5.0-6.5% of water, 29-33% of sand, 6-13% of medium crushed stone, 0.3-0.42% of water reducing agent, 0.03-0.05% of flexible fiber and the balance of small crushed stone, wherein the total mass percentage is 100%.
In the invention, the cement is 42.5-grade low-heat portland cement.
In the invention, the fly ash is F-class I or II fly ash.
In the invention, the mineral powder is S95 grade mineral powder.
In the invention, the flexible fiber is polyethylene fiber or polypropylene fiber.
In the invention, the sand is natural river sand, the fineness modulus is 2.3-3.0, and the particle size range is 0.15-5.0 mm.
In the invention, the small crushed stone is single-particle-grade crushed stone with the particle size of 5-10 mm, and the large crushed stone is single-particle-grade inactive crushed stone with the particle size of 10-20 mm.
In the invention, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
The invention provides a preparation method of low-electric-flux fiber concrete for large volume of maritime work, which comprises the following specific steps:
(1) fully mixing cement, fly ash, mineral powder and fiber in a stirrer for 30-120 seconds;
(2) adding sand and gravel into the stirrer and fully stirring for 30-120 seconds;
(3) slowly adding 1/2 amounts of water and the admixture into the stirrer to stir for 30-120 seconds;
(4) then the rest 1/2 water is slowly added into the stirrer and fully stirred until uniform, and the stirring time is not less than 60 seconds.
In the preparation method, the environmental temperature is higher than 5 ℃ and the leaving temperature of the concrete is lower than 30 ℃ in the preparation process.
The invention has the following beneficial effects:
the compressive strength, hydration temperature rise, crack resistance and electric flux of the low-electric-flux fiber concrete for the large volume of the maritime work are obviously improved compared with those of common large-volume concrete, the 60-day compressive strength of the low-electric-flux fiber concrete for the large volume of the maritime work is 30-50% higher than that of the concrete with the same proportion, the adiabatic temperature rise of the concrete is reduced by about 20-25 ℃, temperature cracks are effectively reduced, the crack resistance of the concrete in the whole age is improved, simultaneously, the electric flux of chloride ions of the concrete is greatly reduced, the electric flux is less than 1000 ℃ under the condition of lower consumption of glue materials, and the requirement of high-performance concrete is met under the condition of lower consumption of the glue materials.
Drawings
FIG. 1 is a graph comparing the adiabatic temperature rise of the low electric flux fiber concrete for marine large volume of the present invention and the ordinary concrete;
FIG. 2 is a comparison of 90 days electric flux of the low electric flux fiber concrete for maritime work large volume of the present invention and the common concrete;
FIG. 3 is a graph comparing the 60-day compressive strength of the low-electric-flux fiber concrete for marine large volume of the present invention with that of the general concrete.
Detailed Description
The invention is further illustrated by the following examples.
Example 1-example 7:
the low-electric-flux fiber concrete for the large volume of the maritime work comprises the following components: cement, fly ash, mineral powder, water, sand, gravel and a water reducing agent; the dosage of the single-component concrete is shown in table 1:
the preparation method sequentially comprises the following steps:
step one, fully mixing cement, fly ash, mineral powder and fibers in a stirrer for no less than 30 seconds;
secondly, adding sand and broken stone into the stirrer and fully stirring for more than 30 seconds;
step three, slowly adding 1/2 amounts of water and the admixture into the stirrer to stir for not less than 30 seconds;
and step four, slowly adding the residual 1/2 water into the stirrer and fully stirring the mixture until the mixture is uniform, wherein the stirring time is not less than 60 seconds.
Further, the preparation method requires the environmental temperature to be higher than 5 ℃ in the preparation process.
Further, the concrete leaving temperature of the preparation method is lower than 30 ℃ in the preparation process.
Table 1:
the ratio of the electric flux of the low-electric-flux fiber concrete for the large volume of the maritime work to the electric flux of the common concrete in 90 days is shown in a table 2;
the 60-day compressive strength of the low-electric-flux fiber concrete and the common concrete for the large volume of the maritime work is shown in the table 3:

Claims (10)

1. a low electric flux fiber concrete for maritime work large volume is characterized in that the components of the low electric flux fiber concrete for maritime work large volume comprise: cement, fly ash, mineral powder, water, sand, gravel and a water reducing agent; wherein the mass ratio of each component is as follows: 8.5-11.5% of cement, 2-4% of fly ash, 2.5-3.5% of mineral powder, 5.0-6.5% of water, 29-33% of sand, 6-13% of medium crushed stone, 0.3-0.42% of water reducing agent, 0.03-0.05% of flexible fiber and the balance of small crushed stone, wherein the total mass percentage is 100%.
2. The marine high volume low electric flux fiber concrete according to claim 1, wherein the cement is 42.5 grade low heat portland cement.
3. The marine high volume low electric flux fiber concrete according to claim 1, wherein the fly ash is class F class i or class II fly ash.
4. The large-volume low-electric-flux fiber concrete for maritime work according to claim 1, wherein the ore powder is S95 grade ore powder.
5. The low electric flux fiber concrete for maritime work large volume according to claim 1, wherein the flexible fiber is polyethylene fiber or polypropylene fiber.
6. The marine high volume low electric flux fiber concrete according to claim 1, wherein the sand is natural river sand having a fineness modulus of 2.3-3.0 and a particle size range of 0.15-5.0 mm.
7. The large volume low electric flux fiber concrete for maritime work according to claim 1, wherein the small crushed stones are single-grain-grade crushed stones of 5mm-10mm, and the large crushed stones are single-grain-grade inactive crushed stones of 10mm-20 mm.
8. The marine high volume low electric flux fiber concrete according to claim 1, wherein the water reducer is a polycarboxylic acid high efficiency water reducer.
9. The preparation method of the large-volume low-electric-flux fiber concrete for the maritime work according to claim 1, which comprises the following specific steps:
(1) fully mixing cement, fly ash, mineral powder and fiber in a stirrer for 30-120 seconds;
(2) adding sand and gravel into the stirrer and fully stirring for 30-120 seconds;
(3) slowly adding 1/2 amounts of water and the admixture into the stirrer to stir for 30-120 seconds;
(4) then the rest 1/2 water is slowly added into the stirrer and fully stirred until uniform, and the stirring time is not less than 60 seconds.
10. The method for preparing the marine large-volume low-electric-flux fiber concrete according to claim 9, wherein the ambient temperature is higher than 5 ℃ and the concrete discharge temperature is lower than 30 ℃ in the preparation process.
CN201911297373.9A 2020-03-03 2020-03-03 Low-electric-flux fiber concrete for large volume of maritime work and preparation method thereof Pending CN111039618A (en)

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Application Number Priority Date Filing Date Title
CN201911297373.9A CN111039618A (en) 2020-03-03 2020-03-03 Low-electric-flux fiber concrete for large volume of maritime work and preparation method thereof

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Citations (10)

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Publication number Priority date Publication date Assignee Title
CN1911853A (en) * 2005-08-11 2007-02-14 同济大学 High volume stability marine concrete and its preparation method
CN101200361A (en) * 2007-11-21 2008-06-18 中铁十七局集团第二工程有限公司 Cement concrete pouring material for bridge framework
CN103408259A (en) * 2013-07-23 2013-11-27 无锡市大通混凝土有限公司 Durable concrete used for frame columns
JP2016030707A (en) * 2014-07-29 2016-03-07 大成建設株式会社 High-strength concrete and production method of concrete member
CN107010900A (en) * 2017-05-11 2017-08-04 福建江夏学院 A kind of high permeability resistant Basalt fiber concrete and preparation method thereof
CN107140912A (en) * 2017-06-14 2017-09-08 湖北交投智能检测股份有限公司 A kind of waterproofing and anti-leakage method of Massive Bridge Concrete
CN110078438A (en) * 2019-04-18 2019-08-02 中国铁建港航局集团有限公司 A kind of polypropylene fiber concrete and preparation method thereof
CN110272244A (en) * 2019-06-25 2019-09-24 浙江东方管桩有限公司 A kind of cracking-proof concrete and its preparation process
CN110467407A (en) * 2019-09-23 2019-11-19 陕西秦汉恒盛新型建材科技股份有限公司 A kind of C70 mass concrete and its preparation process
CN110627453A (en) * 2019-10-30 2019-12-31 安徽海螺建材设计研究院有限责任公司 Marine engineering ultrahigh-performance concrete and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1911853A (en) * 2005-08-11 2007-02-14 同济大学 High volume stability marine concrete and its preparation method
CN101200361A (en) * 2007-11-21 2008-06-18 中铁十七局集团第二工程有限公司 Cement concrete pouring material for bridge framework
CN103408259A (en) * 2013-07-23 2013-11-27 无锡市大通混凝土有限公司 Durable concrete used for frame columns
JP2016030707A (en) * 2014-07-29 2016-03-07 大成建設株式会社 High-strength concrete and production method of concrete member
CN107010900A (en) * 2017-05-11 2017-08-04 福建江夏学院 A kind of high permeability resistant Basalt fiber concrete and preparation method thereof
CN107140912A (en) * 2017-06-14 2017-09-08 湖北交投智能检测股份有限公司 A kind of waterproofing and anti-leakage method of Massive Bridge Concrete
CN110078438A (en) * 2019-04-18 2019-08-02 中国铁建港航局集团有限公司 A kind of polypropylene fiber concrete and preparation method thereof
CN110272244A (en) * 2019-06-25 2019-09-24 浙江东方管桩有限公司 A kind of cracking-proof concrete and its preparation process
CN110467407A (en) * 2019-09-23 2019-11-19 陕西秦汉恒盛新型建材科技股份有限公司 A kind of C70 mass concrete and its preparation process
CN110627453A (en) * 2019-10-30 2019-12-31 安徽海螺建材设计研究院有限责任公司 Marine engineering ultrahigh-performance concrete and preparation method thereof

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