CN108249854A - A kind of fibre reinforced cement base superelevation ductility concrete of seawater stirring and its preparation - Google Patents
A kind of fibre reinforced cement base superelevation ductility concrete of seawater stirring and its preparation Download PDFInfo
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- CN108249854A CN108249854A CN201810072144.6A CN201810072144A CN108249854A CN 108249854 A CN108249854 A CN 108249854A CN 201810072144 A CN201810072144 A CN 201810072144A CN 108249854 A CN108249854 A CN 108249854A
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- seawater
- ductility concrete
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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
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/002—Water
- C04B22/0026—Salt water, e.g. seawater
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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
- 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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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Fibre reinforced cement base superelevation ductility concrete and its preparation, the superelevation ductility concrete the present invention relates to a kind of stirring of seawater are made by the following method：(1) cement, sand and flyash are added in blender by formula, dry powder stirs 2 3min, is sufficiently mixed uniformly；(2) it is further continued for adding in water-reducing agent and seawater, slurry stirs 1 2min；(3) thickener and polyethylene fibre are subsequently added into, is sufficiently stirred 2 3min；(4) after stirring, mold is transferred to, 1 2min that vibrates moldings conserve, and demoulding obtains purpose product.Compared with prior art, superelevation ductility concrete of the present invention has powerful tensile strength and ductility, with good microcrack distribution performance and energy-dissipating property, its mechanical property no notable difference compared with the ultra-high performance concrete prepared using fresh water, it can realize that non-reinforced concrete structure is built, suitable for fields such as island construction.
Description
Technical field
The present invention relates to building material technical field, more particularly, to a kind of fibre reinforced cement base superelevation of seawater stirring
Ductility concrete and its preparation.
Background technology
Within following decades, China will certainly largely build civilian and military dock, seadrome, Oversea wind hair
Infrastructure, the demand to concrete such as power station, offshore lighthouse and radar station, islands and reefs frontier defense fortification are huge.If using tradition
Armored concrete carry out islands and reefs construction, need to transport a large amount of cement, fresh water and sandstone from hinterland, in addition to influencing to construct
Duration can also significantly increase construction cost.In fact, island and coastal area inherently possess abundant seawater and sea sand money
Source.If seawater and sea sand configuration concrete can be utilized, it will greatly reduce the construction cost of islands and reefs, improve and build effect
Rate.However, endurance issues can be brought by preparing concrete using seawater, sea sand.Main reasons is that containing big in seawater, sea sand
The sodium chloride of amount and various inorganic salts.The presence of these salts can cause serious steel bar corrosion, and concrete is caused to use the longevity
The reduction of life.
With the introducing of chopped strand enhancing technology, concrete gradually overcomes the shortcomings that examining tensile behavior is poor, ductility is insufficient.
It is reported that the stretching ductility of steel fiber reinforced concrete is 0.5%~1.0%, axial tensile strength is between 3MPa~15MPa；By
The tensile strength of the polyvinyl alcohol fiber reinforced cement based composites (PVA-ECC) of special designing is about 3MPa~7MPa, is drawn
It is about 2%~4% to stretch limiting strain.Therefore, if non-reinforced UHDCC structures can be prepared using seawater, then puzzlement engineering
Steel bar corrosion (the concrete carbonization, Chloride Attack etc.) problem of boundary for many years is also with regard to recovery occurs without treatment.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of fibres of seawater stirring
Dimension enhancing cement base superelevation ductility concrete and its preparation, product of the present invention have the spy that can keep superelevation tensile strength and ductility
Point has good Crack Control ability, energy dissipation capacity and durability, is a kind of construction material built available for no muscle, institute
With the corrosion problem of the reinforcing bar under briny environment, it is possible to prevente effectively from.This product aims to solve the problem that existing cement-based material brittleness
Greatly, the technical problems such as durability difference of steel bar corrosion under Crack Control energy force difference and briny environment.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of fibre reinforced cement base superelevation ductility concrete of seawater stirring includes the component of following parts by weight：Water
900-950 parts of mud, 400-450 parts of sand, 400-450 parts of flyash, 2.5-4.5 parts of water-reducing agent, 0.5-1.5 parts of thickener, seawater
300-350 parts, 10-20 parts of polyethylene fibre.
Preferably, the cement be composite Portland cement or Portland cement, 28 days compression strength >=
52.5MPa, 28 days flexural strength >=7.0MPa, specific surface area >=300m2/kg.The dosage of cement is limited, mainly due to superelevation
The intensity of ductility concrete material considers, beyond limited range, can have centainly to the intensity of superelevation ductility concrete material
Influence.
Preferably, the sand is ultra-fine sand, and specification is -110 mesh of 70 mesh, and maximum particle diameter is no more than 0.25mm.It limits
The dosage of sand, mainly due to the intensity of superelevation ductility concrete material considers, it, can be to superelevation ductility beyond limited range
The intensity of concrete material has a certain impact.
Preferably, the flyash be level-one flyash, specific surface area >=700m2/ kg, density 2.6g/cm3.Limit
Determine the dosage of flyash, mainly due to the intensity of superelevation ductility concrete material considers, it, can be to super beyond limited range
The intensity of high ductility concrete material has a certain impact.
Preferably, the seawater be common inshore seawater, Cl-Content is 10000~20000mg/L, and salinity is
20-30‰.The dosage of seawater is limited, mainly due to the intensity of superelevation ductility concrete material and preparation process consider, is surpassed
Going out limited range, can have a certain impact to the intensity of superelevation ductility concrete material, the excessive strength of materials of seawater reduces,
It is very few to stir.
Preferably, a diameter of 30-45 μm of the polyethylene fibre, length 8-12mm, draw ratio ＞ 200, fracture
Elongation percentage is 2-3%, tensile strength 2000-4000MPa.The dosage of polyethylene fibre is limited, mainly due to superelevation ductility
Intensity and ductility and the preparation process consideration of concrete material, can be to superelevation ductility concrete material beyond limited range
The intensity and ductility of material have a certain impact, and are excessively not easy to stir, and the very few booster action to cement base reduces, and can make material
Its intensity and ductility reduce.
Preferably, the water-reducing agent be universal polycarboxylic water reducer, solid content 40-50%, water-reducing rate >=
40%.The dosage of water-reducing agent is limited, mainly due to the preparation process of superelevation ductility concrete material considers, beyond what is limited
Range can have a certain impact to the preparation of superelevation ductility concrete material, can excessively make slurry excessively dilute, very few to make slurry mistake
It is thick, it is unfavorable for the dispersion of fiber.
Preferably, the thickener is common starch ether thickener.The dosage of thickener is limited, mainly due to super
The preparation process consideration of high ductility concrete material, can be to the flowing of superelevation ductility concrete material beyond limited range
Property has a certain impact.
The preparation method of the fibre reinforced cement base superelevation ductility concrete of seawater stirring, includes the following steps：
(1) cement, sand and flyash are added in blender by formula, dry powder stirring 2-3min is sufficiently mixed uniformly；
(2) it is further continued for adding in water-reducing agent and seawater, slurry stirring 1-2min；
(3) thickener and polyethylene fibre are subsequently added into, is sufficiently stirred 2-3min；
(4) after stirring, mold is transferred to, the 1-2min that vibrates moldings conserve, and demoulding obtains purpose product.
Preferably, the temperature conserved in step (4) is 20-25 DEG C, humidity 85-95%, is conserved to predetermined age.
The operation principle of the fiber added in the present invention is mainly the interaction with microcrack.Between fiber and microcrack
Interaction it is very complicated, especially when fiber and crack pass through in which there is a situation where inclination angle, and since fiber is in mortar base
Random alignment in body, such case are universal.However, the interaction of most important most basic support stress-cracking response
Disengagement and slip from each individual fibers in cracking.If fruit fiber does not have any slip, they will disconnect, and will not link
Crack both sides.But if slip is excessive, loses and link between composite material, microcrack just loses plane fracture shape and turns
And as macrocrack.
In superelevation ductility concrete, the not just simple friction process of sliding further comprises slip hardening response, anticipates
Taste in sliding process, and the slip resistance at interface can increase between fiber and surrounding mortar.This fiber-basal body interface
Slip hardening response specific stress-cracking relationship of the composite material on thin see is determined in Single Fiber degree, so
It has to strictly control.Therefore, Nonlinear Sliding hardening response is well-designed result so that fiber skid off basis material and
It destroys.In slip, fiber surface is by coarse matrix channel " stripping ", due to sliding distance longest, innermost fibre end
It experienced maximum destruction.This stripping results in " expansion " effect for the remaining fiber linked, is allowed to lead to matrix
Road more consolidation, so as to which the power for needing bigger could extract.
Unlike the PVA fibers used from general Study person, the present invention is using polyethylene fibre, compared to PVA
Fiber, PE fibers have higher intensity and elasticity modulus.Importantly, different from the hydrophily of PVA, PE fibers, which have, hates
It is aqueous, the chemical adhesion between fiber and matrix can be reduced, in withdrawal process, fiber is not easy to break.Meanwhile polyethylene
Fiber plays the role of toughening concrete substrate in the present invention, and the concrete is enable to generate continuous thin and close crack, fine
Diameter, draw ratio, fracture strength and fracture elongation are tieed up, is on the one hand controlled by the technical matters of fibre manufacturer man, separately
On the one hand it being obtained by theoretical calculation and experiment allotment, Fiber Aspect Ratio is excessive, be easy to cause break of CFRP, and draw ratio is insufficient,
Spike protein gene is be easy to cause, both of which cannot make concrete generate the fine and closely woven crack contacted.
By carrying out theoretical calculation according to first crack strength criterion and stable state cracking criterion so that two strain hardening indexs
PSH(J′b/JtiP and σcu/σfc) 3 and 1.2 should be respectively greater than, ensure that the seawater base concrete material that mixes cement can pass through incorporation
The polyethylene fibre of volume fraction 2% or so obtains good stable state multiple cracking development, reaches strain hardening, greatly improve pole
The effect of tensile strength and tension ductility is limited, and by suitable component fine tuning and a large amount of experiment, by compression strength, tension
The working performances such as mechanical properties and setting time, mobility such as intensity, tension ductility are combined well so that the fiber strengthens sea
The water more traditional seawater of base concrete that mixes cement mixes cement base concrete in early stage tensile strength, tension ductility, pressure resistance
Degree and in the case that later strength is obviously improved, it is ensured that enough setting times and mobility.
Compared with prior art, the present invention has the following advantages：
(1), superelevation axial tension ductility is kept while high-tensile is reached, when age is 28d, tensile strength surpasses
8MPa is crossed, axial tension elongation percentage is more than 6%, is more than 10 times of elongation percentage of existing UHPC materials, close to steel ductility.
(2), there is good microcrack distribution performance and good energy-dissipating property.
(3), preparation method is simple, and raw material sources are extensive, and financial cost is low, suitable for large-scale industry Application in Building, profit
By the use of seawater as mixing water, environment-friendly and green.
Description of the drawings
Fig. 1 is the simple tension stress strain diagram of the superelevation ductility concrete of the present invention.
Specific embodiment
A kind of fibre reinforced cement base superelevation ductility concrete of seawater stirring includes the component of following parts by weight：Water
900-950 parts of mud, 400-450 parts of sand, 400-450 parts of flyash, 2.5-4.5 parts of water-reducing agent, 0.5-1.5 parts of thickener, seawater
300-350 parts, 10-20 parts of polyethylene fibre.
As a preferred embodiment of the present invention, the cement is composite Portland cement or common silicic acid
Salt cement, 28 days compression strength >=52.5MPa, 28 days flexural strength >=7.0MPa, specific surface area >=300m2/kg.It limits
The dosage of cement mainly due to the intensity of superelevation ductility concrete material considers, beyond limited range, can prolong superelevation
The intensity of property concrete material has a certain impact.
As a preferred embodiment of the present invention, the sand is ultra-fine sand, and specification is -110 mesh of 70 mesh,
Maximum particle diameter is no more than 0.25mm.The dosage of sand is limited, mainly due to the intensity of superelevation ductility concrete material considers, is exceeded
Limited range can have a certain impact to the intensity of superelevation ductility concrete material.
As a preferred embodiment of the present invention, the flyash be level-one flyash, specific surface area >=
700m2/ kg, density 2.6g/cm3.The dosage of flyash is limited, mainly due to the intensity of superelevation ductility concrete material is examined
Consider, beyond limited range, can have a certain impact to the intensity of superelevation ductility concrete material.
As a preferred embodiment of the present invention, the seawater be common inshore seawater, Cl-Content is
10000~20000mg/L, salinity are 20-30 ‰.The dosage of seawater is limited, mainly due to superelevation ductility concrete material
Intensity and preparation process consider, beyond limited range, can there is certain shadow to the intensity of superelevation ductility concrete material
It rings, the excessive strength of materials of seawater reduces, very few to stir.
As a preferred embodiment of the present invention, a diameter of 30-45 μm of the polyethylene fibre, length are
8-12mm, draw ratio ＞ 200, fracture elongation 2-3%, tensile strength 2000-4000MPa.Limit polyethylene fibre
Dosage, mainly due to the intensity and ductility and preparation process of superelevation ductility concrete material consider, beyond the model limited
It encloses, can have a certain impact to the intensity and ductility of superelevation ductility concrete material, excessively be not easy to stir, it is very few to cement base
Booster action reduces, its intensity and ductility that can make material reduce.
As a preferred embodiment of the present invention, the water-reducing agent is universal polycarboxylic water reducer, Gu
Body content be 40-50%, water-reducing rate >=40%.The dosage of water-reducing agent is limited, mainly due to superelevation ductility concrete material
Preparation process considers, beyond limited range, can have a certain impact to the preparation of superelevation ductility concrete material, excessive meeting
Make slurry excessively dilute, it is very few that slurry can be made feeding-up, it is unfavorable for the dispersion of fiber.
As a preferred embodiment of the present invention, the thickener is common starch ether thickener.It limits
The dosage of thickener, mainly due to the preparation process of superelevation ductility concrete material considers, it, can be right beyond limited range
The mobility of superelevation ductility concrete material has a certain impact.
The preparation method of the fibre reinforced cement base superelevation ductility concrete of seawater stirring, includes the following steps：
(1) cement, sand and flyash are added in blender by formula, dry powder stirring 2-3min is sufficiently mixed uniformly；
(2) it is further continued for adding in water-reducing agent and seawater, slurry stirring 1-2min；
(3) thickener and polyethylene fibre are subsequently added into, is sufficiently stirred 2-3min；
(4) after stirring, mold is transferred to, the 1-2min that vibrates moldings conserve, and demoulding obtains purpose product.
As a preferred embodiment of the present invention, the temperature conserved in step (4) is 20-25 DEG C, humidity 85-
95%, it conserves to predetermined age.
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
For example non-commercially available industrial chemicals for refering in particular to, being working medium commonly used in the art of material used in following each embodiments.
Embodiment 1
The raw material of fibre reinforced cement base superelevation ductility concrete of seawater stirring prepared in the present embodiment is：
P.O.52.5 Portland cements, level-one flyash, sand, water-reducing agent, thickener, seawater and polyethylene fibre, wherein, table
In 1 polyethylene fibre length be 12mm, draw ratio 400.Specific formula is as shown in table 1, and each section is parts by weight content in table.
1 embodiment of table, 1 product formula
| Label | Cement | Sand | Flyash | Thickener | Water-reducing agent | Water | Polyethylene fibre |
| 1 | 930 | 400 | 400 | 1 | 4 | 330.0 | 20 |
Specific preparation process is as follows：
(1) cement, sand and flyash are added in blender, dry powder stirring 2-3min is sufficiently mixed uniformly；
(2) water-reducing agent, seawater are added in blender, slurry stirring 1-2min is stirred；
(3) thickener, polyethylene fibre are added in, is sufficiently stirred 2-3min；
(4) it after to be mixed, is transferred in mold, the 1-2min that vibrates moldings are conserved, conserve to specified age and take off
Mould obtains product.
The results are shown in Table 2 for the mechanical property of product obtained.
2 embodiment of table, 1 product mechanical property experimental test result
| Age | Ultimate tensile strength MPa | Elongation strain % |
| 28d | 8.88 | 6.14 |
1 age was the simple tension stress-strain diagram of 28d for Fig. 1；Being can be found that since figure after loading, power passes
The reading of sensor increases sharply, and extensometer reading then increasess slowly.When load reaches 1kN to 1.5kN or so, on test specimen
There is the first crack, load occurs slightly declining therewith, and the moderate loss at crack starts to play a role at this time, improves and cuts
The bearing capacity in face, makes fracture width gradually tend towards stability.With the increase of load, surface of test piece gradually appears fine and closely woven split
Seam, load-displacement curve then constantly rise in fluctuation.When reach capacity stress when, control critical eigenvalue occur and reach section bridge joint
The limit of power, the width in the crack start to gradually increase, and test specimen bearing capacity slowly reduces, this stage can hear that fiber is drawn
Disconnected sound.Last test specimen is pulled off completely, is thoroughly destroyed, but this process is also slowly to occur, and will not be occurred suddenly
Situation about breaking.
Embodiment 2-5
Compared with Example 1, the overwhelming majority it is all identical, in addition to product formula be accordingly adjusted to：
The product formula of 3 embodiment 2- embodiments 5 of table
| Label | Cement | Sand | Flyash | Thickener | Water-reducing agent | Seawater | Polyethylene fibre |
| Embodiment 2 | 900 | 420 | 420 | 0.5 | 2.5 | 300 | 10 |
| Embodiment 3 | 950 | 450 | 450 | 1.5 | 4.5 | 350 | 15 |
| Embodiment 4 | 910 | 430 | 430 | 1.2 | 3 | 310 | 11 |
| Embodiment 5 | 920 | 440 | 410 | 0.8 | 3.5 | 340 | 18 |
Comparative example 1-3
Compared with Example 1, the overwhelming majority is all identical, in addition to its product formula is accordingly adjusted to：
The product formula of 4 comparative example 1-3 of table
| Label | Cement | Sand | Flyash | Thickener | Water-reducing agent | Seawater | Polyethylene fibre |
| Comparative example 1 | 930 | 400 | 400 | 1 | 4 | 330.0 | 0 |
| Comparative example 2 | 930 | 400 | 400 | 1 | 4 | 330.0 | 5 |
| Comparative example 3 | 930 | 400 | 400 | 1 | 4 | 330.0 | 35 |
Product, mechanical property result such as the following table 5 institute are made using the preparation method in embodiment 1 according to above-mentioned formula
Show.
5 comparative example 1-3 product mechanical property experimental test results of table
| Number | Age | Ultimate tensile strength MPa | Elongation strain % |
| Comparative example 1 | 28d | 1.5 | 0.04 |
| Comparative example 2 | 28d | 2.5 | 3.5 |
| Comparative example 3 | 28d | (can not stir) | - |
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously can easily make these embodiments various modifications, and described herein general
Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to above-described embodiment, abilities
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be the present invention's
Within protection domain.
Claims (10)
1. a kind of fibre reinforced cement base superelevation ductility concrete of seawater stirring, which is characterized in that including following parts by weight
Component：900-950 parts of cement, 400-450 parts of sand, 400-450 parts of flyash, 2.5-4.5 parts of water-reducing agent, thickener 0.5-
1.5 parts, 300-350 parts of seawater, 10-20 parts of polyethylene fibre.
2. a kind of fibre reinforced cement base superelevation ductility concrete of seawater stirring according to claim 1, feature exist
In, the cement be composite Portland cement or Portland cement, 28 days compression strength >=52.5MPa, 28 days
Flexural strength >=7.0MPa, specific surface area >=300m2/kg。
3. a kind of fibre reinforced cement base superelevation ductility concrete of seawater stirring according to claim 1, feature exist
In the sand is ultra-fine sand, and specification is -110 mesh of 70 mesh, and maximum particle diameter is no more than 0.25mm.
4. a kind of fibre reinforced cement base superelevation ductility concrete of seawater stirring according to claim 1, feature exist
In, the flyash be level-one flyash, specific surface area >=700m2/ kg, density 2.6g/cm3。
5. a kind of fibre reinforced cement base superelevation ductility concrete of seawater stirring according to claim 1, feature exist
In, the seawater be common inshore seawater, Cl-Content is 10000~20000mg/L, and salinity is 20-30 ‰.
6. a kind of fibre reinforced cement base superelevation ductility concrete of seawater stirring according to claim 1, feature exist
In, a diameter of 30-45 μm of the polyethylene fibre, length 8-12mm, draw ratio ＞ 200, fracture elongation 2-
3%, tensile strength 2000-4000MPa.
7. a kind of fibre reinforced cement base superelevation ductility concrete of seawater stirring according to claim 1, feature exist
In, the water-reducing agent be universal polycarboxylic water reducer, solid content 40-50%, water-reducing rate >=40%.
8. a kind of fibre reinforced cement base superelevation ductility concrete of seawater stirring according to claim 1, feature exist
In the thickener is common starch ether thickener.
9. the preparation side of the fibre reinforced cement base superelevation ductility concrete of the seawater stirring as described in claim 1-8 is any
Method, which is characterized in that include the following steps：
(1) cement, sand and flyash are added in blender by formula, dry powder stirring 2-3min is sufficiently mixed uniformly；
(2) it is further continued for adding in water-reducing agent and seawater, slurry stirring 1-2min；
(3) thickener and polyethylene fibre are subsequently added into, is sufficiently stirred 2-3min；
(4) after stirring, mold is transferred to, the 1-2min that vibrates moldings conserve, and demoulding obtains purpose product.
10. the preparation method of the fibre reinforced cement base superelevation ductility concrete of seawater stirring according to claim 9,
It is characterized in that, the temperature conserved in step (4) is 20-25 DEG C, humidity 85-95%, is conserved to predetermined age.
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| CN115108785A (en) * | 2022-07-18 | 2022-09-27 | 江苏大学 | Ultra-high-ductility double-doped fiber concrete and preparation method thereof |
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