CN102786272B - 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 PDFInfo
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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
Technical field
The invention belongs to concrete structure material field, be specifically related to fine and close homogeneous 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 coastland, is wherein concrete-steel Beam greatly, than Hangzhou Gulf Great Bridge etc.Concrete-steel Beam construction technology is: the construction of construction → steel case beam lifting operation → prestressed concrete bridge panel of steel case beam.Concrete-steel Beam is the bridge-type structure that a kind of span ability is large, building height is little, have the feature of concrete bridge and steel bridge concurrently, give full play to the feature that concrete crushing resistance is good and steel tensile strength is higher, have advantages of that short construction period, simple to operate, construction period do not affect existing traffic substantially, not only meet the functional requirement of bridge structure, and also had good technical economic benefit.Adopt now concrete-steel Beam to become a kind of trend, but concrete-steel Beam has larger hogging moment at bearing place decking, bridge deck concrete is because bearing larger tensile stress, be prone to problem of Cracking, need thus the concrete that is applied to these decking to there is higher bending strength and toughness, i.e. high ductibility.Ocean concrete preparation is at present mainly mineral admixture and the high efficiency water reducing agents such as adding coal ash, breeze, silica flour, improves concrete density, and then has improved the resistance of concrete to chloride ion penetration.But a large amount of engineering practices show, breeze is in improving concrete work performance and Anti-Chloride Ion Penetration, can increase concrete self-constriction, when constraint is large or maintenance improperly time, concrete easily produces crack, passage is provided to aggressiveness chlorion and carbonic acid gas, has accelerated harmful ion erosion rate, cause concrete deterioration, shorten concrete structure work-ing life.
Summary of the invention
It is a kind of based on reducing fine and close homogeneous C60 ocean concrete of high ductibility of 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 solution used in the present invention is as follows:
The fine and close homogeneous 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, described gelling material is made up of cement and mineral admixture, described to reduce toughner be polyethers economization agent with polymeric polyisocyanate class toughner that can stable dispersion in cement slurry (highly basic haline water slurry body) is 1 in mass ratio: 2-2: 1 composite forming, the ratio of each component is: water: 135-155kg/m
3; Cement: 370-410kg/m
3; Flyash: 20-60kg/m
3; Breeze: 50-90kg/m
3; Fine aggregate 600-800kg/m
3; Coarse aggregate 950-1150kg/m
3; Reduce toughner 2.0-3.0kg/m
3; Water reducer 5.0-8.0kg/m
3; High-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 described fine aggregate is 2.5～3.5.
Press such scheme, described cement is 42.5 grades and 42.5 grades of above P.II silicate cements.
Press such scheme, described water reducer is 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 homogeneous C60 ocean concrete of above-mentioned high ductibility: it is characterized in that: it comprises the following 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 again water, water reducer and reduce toughner, continue mix 60～120s, obtain the fine and close homogeneous C60 ocean concrete of high ductibility based on reducing toughner and high-strength organic polymer fiber.
The present invention by adding after high-strength organic polymer fiber in C60 ocean concrete, can bond more and gather materials, there is bonding force more closely with cement matrix, and it is also even with concrete material mixed distribution easily rapidly, simultaneously because it is fine, the characteristic that specific area is large, can form at inside concrete a kind of uniformly disorderly to support system, produce a kind of effectively secondary stiffening effect, concrete contraction energy is distributed to high-tensile and on the high-strength organic polymer fiber of low-elasticity-modulus, stop the expansion of concrete native defect (microfracture) and delay the appearance in new crack, reduce the yardstick of microfracture, the continuity of strongthener inside, reduce shockwave and be blocked the stress raisers degree causing, greatly improve the fragility of this C60 ocean concrete, in addition, high-strength organic polymer fiber add the fine ribs that is also equivalent to mix enormous quantity in concrete, these primitive fiber muscle can suppress the process of concrete cracking, improve concrete fracture toughness property.
Meanwhile the reducing toughner and can mutually tangle in matrix and form network-like skeleton structure of admixture, the surface tension that reduces concrete pore solution reaches the effect that reduces pore power, thereby reduces concrete dry shrinkage and self-constriction; And can absorption portion striking energy in the time that material is subject to External Force Acting, improve concrete fracture toughness property, and deformation, absorption and transmission by this network-like skeleton structure are from the effect of the impact energy of matrix, reach and reduce toughness reinforcing object.
Beneficial effect of the present invention:
(1) the fine and close homogeneous 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, cracking resistance grade reaches L-IV level, delamination degree≤0.1.
(2) solve Marine Environment on Bridge Concrete and easily produced crack problem, improved concrete bend ductility, extended bridge concrete service life, significant.
Embodiment
In order to understand better the present invention, further illustrate summary of the invention of the present invention below by embodiment, but the present invention is not only confined to the following examples.
Embodiment 1-3:
In 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 evaluate the homogeneity of this ocean concrete
[1] [2];
Embodiment 1
The proportioning of ocean concrete in table 1 embodiment 1
Wherein: described cement is P.II42.5 silicate cement;
Described flyash is II level flyash;
Described breeze is S95 level breeze;
Described fine aggregate is river sand, and fineness modulus is 2.6;
Described coarse aggregate is 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
economization agent for concrete; Polymeric polyisocyanate class toughner is Jiangsu Botexin Materials Co., Ltd
concrete in-situ toughening material;
Described high-strength organic polymer fiber is density 0.91～0.98g/cm that Wuhan Xin Tu company limited 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 polycarboxylic acid series high efficiency water reducing agent.
Choose raw material according to the proportioning raw materials in table 1, pour gelling material, coarse aggregate, fine aggregate and high-strength organic polymer fiber in concrete mixer dry mixing 30s, add again water, water reducer and reduce toughner, continue mix 60～120s, obtain the fine and close homogeneous C60 ocean concrete of high ductibility.Its physicals technical indicator and endurance quality technical indicator are listed in respectively table 5 and table 6.
Embodiment 2
The proportioning of ocean concrete in table 2 embodiment 2
Wherein: described cement is P.II42.5 silicate cement;
Described fine aggregate is the artificial sand that meets national standard, and fineness modulus is 2.8;
Described 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
economization agent for concrete; Toughner is Jiangsu Botexin Materials Co., Ltd
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.
Choose raw material according to the proportioning raw materials in table 2, pour gelling material, coarse aggregate, fine aggregate and high-strength organic polymer fiber in concrete mixer dry mixing 30s, add again water, water reducer and reduce toughner, continue mix 60～120s, obtain the fine and close homogeneous C60 ocean concrete of high ductibility.Its physicals technical indicator and endurance quality technical indicator are listed in respectively table 5 and table 6.
Embodiment 3
The proportioning of ocean concrete in table 3 embodiment 3
Described cement is P.O42.5 silicate cement;
Described flyash is I level flyash;
Described breeze is S105 level breeze;
Described fine aggregate is river sand, and fineness modulus is 3.0;
Described 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
economization agent for concrete; Toughner is Jiangsu Botexin Materials Co., Ltd
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.
Choose raw material according to the proportioning raw materials in table 3, pour gelling material, coarse aggregate, fine aggregate and high-strength organic polymer fiber in concrete mixer dry mixing 30s, add again water, water reducer and reduce toughner, continuing mix 60～120s, obtaining the fine and close homogeneous 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 in table 4 embodiment 4
Described cement is P.O 52.5 silicate cements;
The fineness modulus of described fine aggregate is 3.6;
Described 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.
Choose raw material according to the proportioning raw materials in table 4, pour gelling material, coarse aggregate, fine aggregate and high-strength organic polymer fiber in concrete mixer dry mixing 30s, add again water, water reducer and reduce toughner, continuing mix 60～120s, obtaining the fine and close homogeneous 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
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) | Cracking resistance grade | Bending toughness index η 30 |
| 1 | 1.35 | L-V level | 11.9 |
| 2 | 1.38 | L-V level | 12.1 |
| 3 | 1.37 | L-V level | 12.0 |
| 4 | 1.38 | L-V level | 11.8 |
| Comparative example 1 | 1.46 | L-IV level | 9.7 |
Note: comparative example 1 is the not high-strength organic polymer fiber of admixture and the C60 ocean concrete of same proportioning that reduces toughner of reference example 2;
Table 5 illustrates: the physical properties of the fine and close homogeneous C60 ocean concrete of high ductibility of preparing according to the present invention is good, and homogeneity is high, has excellent serviceability.
Table 6 illustrates: the bending resistance of the fine and close homogeneous ocean concrete of high ductibility of preparing according to the present invention draws performance can reach international performance index, has good endurance quality.
The each concrete raw material that the present invention is cited, and the bound of each raw material, interval value can realize the present invention, do not enumerate embodiment at this.
Reference:
[1]: Ding Qingjun, Zou Dinghua, Wang Fazhou etc. factors on homogeneous of specified density concrete 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 (8)
1. the fine and close homogeneous C60 ocean concrete 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, described gelling material is made up of cement and mineral admixture, described to reduce toughner be polyethers economization agent forms for 1:2-2:1 is composite in mass ratio with polymeric polyisocyanate class toughner that can stable dispersion in cement slurry, the ratio of each component is: water: 135-155 kg/m
3; Cement: 370-410 kg/m
3; Flyash: 20-60 kg/m
3; Breeze: 50-90 kg/m
3; Fine aggregate 600-800 kg/m
3; Coarse aggregate 950-1150 kg/m
3; Reduce toughner 2.0-3.0 kg/m
3; Water reducer 5.0-8.0kg/m
3; High-strength organic polymer fiber 3.0-5.0 kg/m
3, described polymeric polyisocyanate class toughner is the SBT of Jiangsu Botexin Materials Co., Ltd
iTM concrete in-situ toughening material; Described high-strength organic polymer fiber is the polypropylene fibre of tensile strength>=450MPa, initial modulus>=5.0GPa.
2. the fine and close homogeneous C60 ocean concrete of high ductibility according to claim 1, 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 homogeneous C60 ocean concrete of high ductibility according to claim 1, is characterized in that: described mineral admixture is made up of flyash and breeze.
4. the fine and close homogeneous C60 ocean concrete of high ductibility according to claim 3, 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 homogeneous C60 ocean concrete of high ductibility according to claim 1, is characterized in that: described fine aggregate is river sand or artificial sand, and the fineness modulus of described fine aggregate is 2.5 ~ 3.5.
6. the fine and close homogeneous C60 ocean concrete of high ductibility according to claim 1, is characterized in that: described cement is 42.5 grades and 42.5 grades of above P. II silicate cements.
7. the fine and close homogeneous C60 ocean concrete of high ductibility according to claim 1, is characterized in that: described water reducer is polycarboxylic acid series high efficiency water reducing agent.
8. the preparation method of the fine and close homogeneous C60 ocean concrete of high ductibility claimed in claim 1, it is characterized in that: it comprises the following 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 again water, water reducer and reduce toughner, continue mix 60～120s, to obtain final product.
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