CN102786272A - High-ductility compact homogenous C60 marine concrete and preparation method thereof - Google Patents

High-ductility compact homogenous C60 marine concrete and preparation method thereof Download PDF

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CN102786272A
CN102786272A CN2012102795343A CN201210279534A CN102786272A CN 102786272 A CN102786272 A CN 102786272A CN 2012102795343 A CN2012102795343 A CN 2012102795343A CN 201210279534 A CN201210279534 A CN 201210279534A CN 102786272 A CN102786272 A CN 102786272A
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concrete
fine
cement
toughner
organic polymer
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CN102786272B (en
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刘沐宇
丁庆军
张强
黄修林
宋晓波
刘其彬
杨堃
王志亮
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Wuhan University of Technology WUT
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Abstract

The invention relates to high-ductility compact homogenous C60 marine concrete, which is characterized by consisting of water, a cementing material, fine aggregate, coarse aggregate, a reducing and toughening agent, a water reducing agent and high-strength organic polymer fiber, wherein the cementing material consists of cement and mineral admixture; the reducing and toughening agent is formed by compounding a polyether reducing agent and a polyisocyanate toughening agent which can be stably dispersed in cement slurry (strong-base and high-salt cement slurry) according to a weight ratio of 1:2-2:1; and the concrete comprises the components in proportion: 135-155 kg/m<3> of the water, 370-410 kg/m<3> of the cement, 20-60 kg/m<3> of fly ash, 50-90 kg/m<3> of the mineral powder, 600-800 kg/m<3> of the fine aggregate, 950-1,150 kg/m<3> of the coarse aggregate, 2.0-3.0 kg/m<3> of the reducing and toughening agent, 5.0-8.0 kg/m<3> of the water reducing agent and 3.0-5.0 kg/m<3> of the high-strength organic polymer fiber. The mechanical property, the durability and the homogeneity of the high-ductility compact homogenous C60 marine concrete are obviously improved, wherein the 28 d rupture strength is greater than or equal to 7.0 MPa, the 28 d tensile splitting strength is greater than or equal to 5.0 MPa, the bend ductility index eta 30 is greater than or equal to 10, the 28 d chloride ion diffusion coefficient is less than 1.5*10<-12> m<2> .s<-1>, the crack resistance level reaches L-IV level, and the layering degree is less than or equal to 0.010.

Description

Fine and close even matter C60 ocean concrete of a kind of high ductibility and preparation method thereof
Technical field
The invention belongs to the concrete structure material field, be specifically related to fine and close even matter C60 ocean concrete of a kind of high ductibility and preparation method thereof.
Background technology
At present a large amount of bridges has been built in the coastland, is the steel reinforced concrete composite beam greatly wherein, than Hangzhou Gulf Great Bridge etc.Steel reinforced concrete composite beam construction technology is: the construction of the construction of steel case beam → steel case beam lifting operation → prestressed concrete bridge panel.The steel reinforced concrete composite beam is the bridge-type structure that a kind of span ability is big, building height is little; Have the characteristics of concrete bridge and steel bridge concurrently; The characteristics that concrete crushing resistance is good and steel tensile strength is higher have been given full play to; Have short construction period, simple to operate, advantage that construction period does not influence existing traffic basically, not only satisfied the functional requirement of bridge structure, and also have technical economic benefit preferably.Adopt the steel reinforced concrete composite beam to become a kind of trend now; Decking have bigger hogging moment but the steel reinforced concrete composite beam is at the bearing place; Bridge deck concrete is because of bearing bigger tensile stress; Be prone to the cracking problem, the concrete that need be applied to these decking thus has higher bending strength and toughness, i.e. high ductibility.Ocean concrete preparation at present mainly is mineral admixture and high efficiency water reducing agents such as adding coal ash, breeze, silica flour, improves concrete density, and then has improved the chloride-penetration resistance ability.But a large amount of engineering practices show that breeze can increase concrete self-constriction when improving workability of concrete ability and resistance of chloride ion penetration ability; Big or maintenance is improperly the time when constraint; Concrete is prone to produce the crack, passage is provided for aggressiveness cl ions and carbonic acid gas, has accelerated the harmful ion erosion rate; Cause concrete deterioration, shorten concrete structure work-ing life.
Summary of the invention
It is a kind of based on fine and close even matter C60 ocean concrete of the high ductibility that reduces toughner and high-strength organic polymer fiber and preparation method thereof that technical problem to be solved by this invention is to provide.This C60 ocean concrete resistance to compression anti-bending strength is good, good toughness, and ductility is high, and homogeneity is high.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is following:
The fine and close even matter C60 ocean concrete of a kind of high ductibility; It is characterized in that: it by water, gelling material, fine aggregate, coarse aggregate, reduce toughner, water reducer and high-strength organic polymer fiber and form; Said gelling material is made up of cement and mineral admixture; Described to reduce toughner be the polyethers economization agent with at cement slurry (highly basic haline water slurry body) but in the polymeric polyisocyanate class toughner of stable dispersion be 1 by mass ratio: 2-2: 1 composite forming the ratio of each component is: water: 135-155kg/m 3Cement: 370-410kg/m 3Flyash: 20-60kg/m 3Breeze: 50-90kg/m 3Fine aggregate 600-800kg/m 3Coarse aggregate 950-1150kg/m 3Reduce toughner 2.0-3.0kg/m 3Water reducer 5.0-8.0kg/m 3High-strength organic polymer fiber 3.0-5.0kg/m 3
Press such scheme, described coarse aggregate is common rubble or crushed gravel, 5～25mm continuous grading, crush values index 6%～16%.
Press such scheme, described mineral admixture is made up of flyash and breeze.
Press such scheme, described flyash is II level or I level flyash; Described breeze is the above breeze of S95 level.
Press such scheme, described fine aggregate is river sand or artificial sand, and the fineness modulus of said fine aggregate is 2.5～3.5.
Press such scheme, described cement is the P.II silicate cement more than 42.5 grades and 42.5 grades.
Press such scheme, described water reducer is a polycarboxylic acid series high efficiency water reducing agent.
Press such scheme, described high-strength organic polymer fiber is the polypropylene fibre of tensile strength >=450MPa, initial modulus >=5.0GPa.
The preparation method of the fine and close even matter C60 ocean concrete of above-mentioned high ductibility: it is characterized in that: it may further comprise the steps: choose raw material according to proportioning raw materials; Pour gelling material, coarse aggregate, fine aggregate and high-strength organic polymer fiber in concrete mixer dry mixing 30～60s; Add entry, water reducer again and reduce toughner; Continue mix 60～120s, promptly get based on the fine and close even matter C60 ocean concrete of the high ductibility that reduces toughner and high-strength organic polymer fiber.
The present invention can bond more and gather materials through after in the C60 ocean concrete, adding high-strength organic polymer fiber, with cement matrix bonding force is more closely arranged; And also even with the concrete material mixed distribution easily rapidly, simultaneously because its fine, that specific area is big characteristic; Can constitute a kind of uniform unrest to support system at inside concrete, produce a kind of effective secondary stiffening effect, be distributed to high-tensile to concrete contraction energy and on the high-strength organic polymer fiber of low-elasticity-modulus; Stop the expansion of concrete native defect (microfracture) and delay new fissured appearance, reduce the yardstick of microfracture, the continuity that strongthener is inner; Reduce shockwave and be blocked the stress raisers degree that causes; Improve the fragility of this C60 ocean concrete greatly, in addition, the adding of high-strength organic polymer fiber also is equivalent in concrete, mix the fine ribs of enormous quantity; These primitive fiber muscle can suppress the process of concrete cracking, improve concrete fracture toughness property.
The reducing toughner and can in matrix, tangle each other and form network-like skeleton structure of admixture meanwhile, the surface tension that reduces concrete pore solution reaches the effect that reduces pore power, thereby reduces concrete dry shrinkage and self-constriction; But and receive external force and make time spent absorption portion striking energy when material, improve concrete fracture toughness property, and deformation, absorption and transmission through this network-like skeleton structure reach and reduce toughness reinforcing purpose from the effect of the impact energy of matrix.
Beneficial effect of the present invention:
(1) the fine and close even matter C60 ocean concrete mechanical property of high ductibility provided by the invention, endurance quality, volume stability and homogeneity be improved significantly, wherein 28d folding strength>=7.0Mpa, 28d tensile splitting strength>=5.0MPa, Bending toughness index η 30>=10,28d chloride diffusion coefficient＜1.5 * 10 -12m 2S -1, the cracking resistance grade reaches L-IV level, delamination degree≤0.1.
(2) solve the easy crack problem that produces of bridge concrete under the ocean environment, improved concrete bend ductility, prolonged the bridge concrete service life, significant.
Embodiment
In order to understand the present invention better, further illustrate summary of the invention of the present invention through embodiment below, but the present invention not only is confined to following embodiment.
Embodiment 1-3:
Among the following embodiment 1-3: use the disclosed a kind of light aggregate concrete rheological property of patent No. ZL200720086777.X and this concrete delamination degree of homogeneous detection means measure, thereby estimate the homogeneity of this ocean concrete [1] [2]
Embodiment 1
The proportioning of ocean concrete among table 1 embodiment 1
Figure BDA00001987300100031
Figure BDA00001987300100041
Wherein: described cement is the P.II42.5 silicate cement;
Described flyash is II level flyash;
Described breeze is a S95 level breeze;
Described fine aggregate is a river sand, and fineness modulus is 2.6;
Said coarse aggregate is a crushed gravel, and crush values is 15%, 5～25mm continuous grading;
The described toughner that reduces is 1: 1 composite forming by polyethers economization agent and polymeric polyisocyanate class toughner mass ratio;
Economization agent is Jiangsu Botexin Materials Co., Ltd
Figure BDA00001987300100042
economization agent for concrete; Polymeric polyisocyanate class toughner is Jiangsu Botexin Materials Co., Ltd
Figure BDA00001987300100043
concrete in-situ toughening material;
Described high-strength organic polymer fiber is density 0.91～0.98g/cm that new way, Wuhan ltd produces 3, length 25 ± 2mm, diameter 1.3mm, tensile strength>=450MPa, elongation at break≤30%, the polypropylene fibre of initial modulus>=5.0GPa;
Described water reducer is a polycarboxylic acid series high efficiency water reducing agent.
Proportioning raw materials according in the table 1 is chosen raw material; Pour gelling material, coarse aggregate, fine aggregate and high-strength organic polymer fiber in concrete mixer dry mixing 30s; Add entry, water reducer again and reduce toughner; Continue mix 60～120s, promptly get the fine and close even matter C60 ocean concrete of high ductibility.Its physicals technical indicator and endurance quality technical indicator are listed in table 5 and table 6 respectively.
Embodiment 2
The proportioning of ocean concrete among table 2 embodiment 2
Figure BDA00001987300100044
Wherein: described cement is the P.II42.5 silicate cement;
Described fine aggregate is the artificial sand of National standard, and fineness modulus is 2.8;
Said coarse aggregate is common rubble, and crush values is 12%, 5～25mm continuous grading;
The described toughner that reduces is 1: 2 composite forming by polyethers economization agent and polymeric polyisocyanate class toughner mass ratio;
Economization agent is Jiangsu Botexin Materials Co., Ltd
Figure BDA00001987300100052
economization agent for concrete; Toughner is Jiangsu Botexin Materials Co., Ltd
Figure BDA00001987300100053
concrete in-situ toughening material;
Described high-strength organic polymer fiber is density 0.91～0.98g/cm 3, length 30 ± 2mm, diameter 0.8～1.1mm, tensile strength>=450MPa, elongation at break≤30%, the polypropylene fibre of initial modulus>=5.0GPa.
Proportioning raw materials according in the table 2 is chosen raw material; Pour gelling material, coarse aggregate, fine aggregate and high-strength organic polymer fiber in concrete mixer dry mixing 30s; Add entry, water reducer again and reduce toughner; Continue mix 60～120s, promptly get the fine and close even matter C60 ocean concrete of high ductibility.Its physicals technical indicator and endurance quality technical indicator are listed in table 5 and table 6 respectively.
Embodiment 3
The proportioning of ocean concrete among table 3 embodiment 3
Figure BDA00001987300100054
Described cement is the P.O42.5 silicate cement;
Described flyash is I level flyash;
Described breeze is a S105 level breeze;
Described fine aggregate is a river sand, and fineness modulus is 3.0;
Said coarse aggregate is common rubble, and crush values is 10%, 5～25mm continuous grading;
The described toughner that reduces is 2: 1 composite forming by polyethers economization agent and polymeric polyisocyanate class toughner mass ratio;
Economization agent is Jiangsu Botexin Materials Co., Ltd
Figure BDA00001987300100061
economization agent for concrete; Toughner is Jiangsu Botexin Materials Co., Ltd
Figure BDA00001987300100062
concrete in-situ toughening material;
Described high-strength organic polymer fiber is density 0.91～0.98g/cm3, length 38mm, diameter 1.0mm, tensile strength>=450MPa, elongation at break≤35%, the polypropylene fibre of initial modulus>=5.0GPa.
Proportioning raw materials according in the table 3 is chosen raw material; Pour gelling material, coarse aggregate, fine aggregate and high-strength organic polymer fiber in concrete mixer dry mixing 30s; Add entry, water reducer again and reduce toughner, continue mix 60～120s, promptly get the fine and close even matter ocean concrete of high ductibility.Its physicals technical indicator and endurance quality technical indicator are listed in table 5 and table 6.
Embodiment 4
The proportioning of ocean concrete among table 4 embodiment 4
Described cement is P.O 52.5 silicate cements;
The fineness modulus of described fine aggregate is 3.6;
Said coarse aggregate is common rubble, and crush values is 10%, 5～25mm continuous grading;
The described toughner that reduces is 1: 1 composite forming by polyethers economization agent and polymeric polyisocyanate class toughner mass ratio;
Described high-strength organic polymer fiber is density 0.91～0.98g/cm 3, length 30 ± 2mm, diameter 0.8～1.1mm, tensile strength>=350MPa, elongation at break≤30%, the polypropylene fibre of initial modulus>=4.0GPa.
Proportioning raw materials according in the table 4 is chosen raw material; Pour gelling material, coarse aggregate, fine aggregate and high-strength organic polymer fiber in concrete mixer dry mixing 30s; Add entry, water reducer again and reduce toughner, continue mix 60～120s, promptly get the fine and close even matter ocean concrete of high ductibility.Its physicals technical indicator and endurance quality technical indicator are listed in table 5 and table 6.
The physical and mechanical property technical indicator of the ocean concrete that table 5 embodiment 1～4 prepares
Figure BDA00001987300100071
The endurance quality technical indicator of the ocean concrete that table 6 embodiment 1～4 prepares
Embodiment 56d chloride permeability coefficient (10 -12m 2/s) The cracking resistance grade Bending toughness index η 30
?1 1.35 The L-V level 11.9
?2 1.38 The L-V level 12.1
?3 1.37 The L-V level 12.0
?4 1.38 The L-V level 11.8
Comparative Examples 1 1.46 The L-IV level 9.7
Annotate: Comparative Examples 1 be reference implementation example 2 not the high-strength organic polymer fiber of admixture with reduce the C60 ocean concrete of the same proportioning of toughner;
Table 5 explanation: each item physicals according to the C60 ocean concrete of the fine and close even matter of high ductibility of the present invention's preparation is good, and homogeneity is high, has excellent serviceability.
Table 6 explanation: draw performance can reach international performance index according to the fine and close bending resistance of sparing the ocean concrete of matter of the high ductibility of the present invention's preparation, have the favorable durability ability.
Each concrete raw material that the present invention is cited, and the bound of each raw material, interval value can both realize the present invention, do not enumerate embodiment one by one at this.
Reference:
[1]: Ding Qingjun, Zou Dinghua, Wang Fazhou etc. specified density concrete homogeneity Study on influencing factors [J]. concrete, 2005,8:57-61.
[2]: Wang Fazhou, Ding Qingjun, Hu Shuguang, etc. a kind of light aggregate concrete rheological property and homogeneous proofing unit [P]. China, ZL 200720086777.X, 2008-08-06.

Claims (9)

1. matter C60 ocean concrete is spared in a high ductibility densification; It is characterized in that: it by water, gelling material, fine aggregate, coarse aggregate, reduce toughner, water reducer and high-strength organic polymer fiber and form; Said gelling material is made up of cement and mineral admixture; Described to reduce toughner be the polyethers economization agent that but to be that 1:2-2:1 is composite with the polymeric polyisocyanate class toughner of stable dispersion in cement slurry by mass ratio form, and the ratio of each component is: water: 135-155 kg/m 3Cement: 370-410 kg/m 3Flyash: 20-60 kg/m 3Breeze: 50-90 kg/m 3Fine aggregate 600-800 kg/m 3Coarse aggregate 950-1150 kg/m 3Reduce toughner 2.0-3.0 kg/m 3Water reducer 5.0-8.0kg/m 3High-strength organic polymer fiber 3.0-5.0 kg/m 3
2. the fine and close even matter C60 ocean concrete of high ductibility according to claim 1, it is characterized in that: described coarse aggregate is common rubble or crushed gravel, 5～25mm continuous grading, crush values index 6%～16%.
3. the fine and close even matter C60 ocean concrete of high ductibility according to claim 1, it is characterized in that: described mineral admixture is made up of flyash and breeze.
4. the fine and close even matter C60 ocean concrete of high ductibility according to claim 1, it is characterized in that: described flyash is II level or I level flyash; Described breeze is the above breeze of S95 level.
5. the fine and close even matter C60 ocean concrete of high ductibility according to claim 1, it is characterized in that: described fine aggregate is river sand or artificial sand, the fineness modulus of said fine aggregate is 2.5 ~ 3.5.
6. the fine and close even matter C60 ocean concrete of high ductibility according to claim 1, it is characterized in that: described cement is the P. II silicate cement more than 42.5 grades and 42.5 grades.
7. the fine and close even matter C60 ocean concrete of high ductibility according to claim 1, it is characterized in that: described water reducer is a polycarboxylic acid series high efficiency water reducing agent.
8. the fine and close even matter C60 ocean concrete of high ductibility according to claim 1, it is characterized in that: described high-strength organic polymer fiber is the polypropylene fibre of tensile strength >=450MPa, initial modulus >=5.0GPa.
9. the preparation method of matter C60 ocean concrete is spared in the high ductibility densification; It is characterized in that: it may further comprise the steps: choose raw material according to proportioning raw materials; Pour gelling material, coarse aggregate, fine aggregate and high-strength organic polymer fiber in concrete mixer dry mixing 30～60s; Add entry, water reducer again and reduce toughner, continue mix 60～120s, promptly get.
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CN102976697A (en) * 2012-12-24 2013-03-20 武汉理工大学 High-ductility low-shrinkage anti-cracking concrete for bridge deck pavement and preparation method thereof
CN102995567A (en) * 2012-12-24 2013-03-27 武汉理工大学 Preparation method of cement concrete and asphalt concrete composite bridge deck pavement structure capable of eliminating steel-bar net pieces
CN103922680A (en) * 2014-03-22 2014-07-16 中国二十二冶集团有限公司 Method for preparing green high-performance concrete by large doping amount mineral admixture
CN105130335A (en) * 2015-08-14 2015-12-09 武汉理工大学 Low shrinkage anti-cracking C60 grade self-compacting bridge tower concrete based on internal curing, shrinkage compensating and toughening, and preparation method thereof
CN105601201A (en) * 2015-12-26 2016-05-25 乔俊擎 Bridge corrosion-proof concrete and preparation method therefor
CN105801033A (en) * 2016-04-26 2016-07-27 陈鹏 Preparation method of high-strength concrete
CN106587831A (en) * 2016-12-13 2017-04-26 武汉理工大学 Super-elevation pumping marine concrete and preparation method thereof
CN107021685A (en) * 2017-05-22 2017-08-08 山东交通学院 A kind of concrete for building a bridge
CN107021708A (en) * 2017-05-31 2017-08-08 福建省盛威建设发展有限公司 A kind of regeneration aggregate pervious concrete and preparation method thereof
CN108101459A (en) * 2017-12-26 2018-06-01 北京市第五建筑工程集团有限公司 A kind of mesh polypropylene-fibre concrete and preparation method thereof
CN108328994A (en) * 2018-03-29 2018-07-27 吉林重通成飞新材料股份公司 A kind of anti-crack concrete and preparation method thereof
CN109265097A (en) * 2018-09-12 2019-01-25 东莞市润阳联合智造有限公司 A kind of high ductility cement-based material and preparation method thereof
CN111533505A (en) * 2020-04-13 2020-08-14 上海二十冶建设有限公司 High-ductility concrete floor material and preparation method thereof
CN112430019A (en) * 2020-12-02 2021-03-02 福建源鑫环保科技有限公司 Submerged arc furnace slag concrete material for ocean dam construction

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CN102976697A (en) * 2012-12-24 2013-03-20 武汉理工大学 High-ductility low-shrinkage anti-cracking concrete for bridge deck pavement and preparation method thereof
CN102995567A (en) * 2012-12-24 2013-03-27 武汉理工大学 Preparation method of cement concrete and asphalt concrete composite bridge deck pavement structure capable of eliminating steel-bar net pieces
CN102976697B (en) * 2012-12-24 2014-07-02 武汉理工大学 High-ductility low-shrinkage anti-cracking concrete for bridge deck pavement and preparation method thereof
CN103922680A (en) * 2014-03-22 2014-07-16 中国二十二冶集团有限公司 Method for preparing green high-performance concrete by large doping amount mineral admixture
CN105130335A (en) * 2015-08-14 2015-12-09 武汉理工大学 Low shrinkage anti-cracking C60 grade self-compacting bridge tower concrete based on internal curing, shrinkage compensating and toughening, and preparation method thereof
CN105601201A (en) * 2015-12-26 2016-05-25 乔俊擎 Bridge corrosion-proof concrete and preparation method therefor
CN105801033A (en) * 2016-04-26 2016-07-27 陈鹏 Preparation method of high-strength concrete
CN106587831B (en) * 2016-12-13 2018-11-06 武汉理工大学 A kind of superhigh-lift pumping maritime concrete and preparation method thereof
CN106587831A (en) * 2016-12-13 2017-04-26 武汉理工大学 Super-elevation pumping marine concrete and preparation method thereof
CN107021685A (en) * 2017-05-22 2017-08-08 山东交通学院 A kind of concrete for building a bridge
CN107021708A (en) * 2017-05-31 2017-08-08 福建省盛威建设发展有限公司 A kind of regeneration aggregate pervious concrete and preparation method thereof
CN108101459A (en) * 2017-12-26 2018-06-01 北京市第五建筑工程集团有限公司 A kind of mesh polypropylene-fibre concrete and preparation method thereof
CN108328994A (en) * 2018-03-29 2018-07-27 吉林重通成飞新材料股份公司 A kind of anti-crack concrete and preparation method thereof
CN109265097A (en) * 2018-09-12 2019-01-25 东莞市润阳联合智造有限公司 A kind of high ductility cement-based material and preparation method thereof
CN111533505A (en) * 2020-04-13 2020-08-14 上海二十冶建设有限公司 High-ductility concrete floor material and preparation method thereof
CN112430019A (en) * 2020-12-02 2021-03-02 福建源鑫环保科技有限公司 Submerged arc furnace slag concrete material for ocean dam construction

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