CN106747055A - A kind of strong superelevation ductility cement-base composite material of superelevation and preparation method thereof - Google Patents
A kind of strong superelevation ductility cement-base composite material of superelevation and preparation method thereof Download PDFInfo
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- CN106747055A CN106747055A CN201611046487.2A CN201611046487A CN106747055A CN 106747055 A CN106747055 A CN 106747055A CN 201611046487 A CN201611046487 A CN 201611046487A CN 106747055 A CN106747055 A CN 106747055A
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- superelevation
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention discloses strong superelevation ductility cement-base composite material of a kind of superelevation and preparation method thereof, more than 150MPa, the ductility under uniaxial tension load is more than 5% for the compression strength of the cement-base composite material.Constitute and be：The mix water consumption ratio of mud is expressed as 0.17~0.23, and the volumn concentration of fiber is 2.0~2.5%, and other components are made up of the component of following weight/mass percentage composition：Cement 36%~57%, silicon ash 11%~21%, consistency modifiers 5%~13%, flyash 5%~15%, sand 19~26%, silicon ash dispersed modifier 0.021~0.043%, water reducer 2.957%~2.979%.The present invention breaches the bottleneck that ECC intensity is difficult more than 100MPa, and strong evidence and new Research Thinking are provided to prepare intensity ECC higher, and simultaneously and can meet some important engineerings to cement-based material intensity and the double requirements of ductility.
Description
Technical field
The present invention relates to building material technical field, more particularly to a kind of strong superelevation ductility cement-base composite material of superelevation
Preparation method.
Background technology
Although cement concrete has many advantages in building material field, there are still tensile strength is low, poor toughness
Deng not enough.Under stress, crack connection extension can rapidly occur after concrete produces the first crack, cause concrete
Generation brittle break.The research and application of current various fiber concretes have been achieved for great successes, largely
Solve the problem of Cracking of concrete.To improve traditional fibre concrete performance, fiber concrete is met to strain hardening capacity
Demand, in recent decades both at home and abroad for tencel enhancing cement-base composite material progress it is very rapid, also promote
Researcher is set to have new understanding for the concept of modern fiber concrete.The Victor C.Li religions of Univ Michigan-Ann Arbor USA
Award the design theory taught with the Leung of Massachusetts Polytechnics and ductility cement-base composite material (ECC) high was proposed in 1992
And successfully prepare the ECC of strainable hardening and multiple crack growth.The theory is based on Micromechanics and fracture mechanics general principle, leads to
The performance driving method for designing of Micromechanics is crossed, the fiber ridge method using disordered short steel fiber enhancing cement-base composite material is used as grinding
Study carefully theoretical foundation, it is considered to the interfacial characteristics of fiber properties, matrix characteristics and fiber/matrix and its between influence each other, set up
The quasi- strain of acquisition material -- the criterion of strength and energy criteria met needed for hardening characteristics.
In recent years, the continuous increasing of continuing to develop with ECC theoretical researches and experimental study, and cases of engineering
It is many, find ECC materials performance only when its stretching strain ability stably reaches more than 3% its strain-hardening property be only stabilization
, deform increase during could stably with the generation in a plurality of fine and closely woven crack, when currently often referring to ECC materials all
Its stretching strain ability can be stated more than 3%, 150~300 times of normal concrete are corresponded to, general fibre concrete 30~
300 times.In sum, initial ECC is a kind of formulation of broad sense, and the ECC materials for being developed to today only refer to that wherein the limit is drawn
Adaptability to changes superelevation ductility cement-base composite material stably more than 3%.It is specifically defined as：Using short fiber reinforced, and
No more than the 2.5% of total composite volume, the composite after hardening should have significant strain hardening feature to fibers content,
A plurality of fine and closely woven crack can be produced under tensile load effect, ultimate tensile strength can stably reach more than 3%.
Existing substantial amounts of research shows that the speed of concrete structure performance deterioration is heavily dependent on water, titanium dioxide
The speed that the harmful ion such as carbon and chlorion is invaded to inside concrete.In modern 20 years of researches, domestic and foreign scholars, pin
Basic mechanical performance and durability to ECC have carried out substantial amounts of research work, at home, the Xu Shi Lang religions of Dalian University of Technology
Substantial amounts of research work has been done with regard to ductility cement-base composite material high by the Mr. Zhang professor research team for awarding Research Team and Tsing-Hua University
Make, and achieve plentiful and substantial scientific achievement.ECC in loading process, due at cracking the bridge linking effect and fiber of fiber with
Crack can stablize and extend when stress is transmitted between matrix so that ECC shows obvious multiple crack growth characteristic and strain hardening row
For, maximum crack width can be even controlled within 0.1mm, under the situation of drying and watering cycle, in the presence of water, and crack meeting
Self-regeneration is healed again, can effectively prevent the intrusion of extraneous harmful substance, and ECC has more preferable mechanical property and durability.
Accordingly, with respect to traditional fiber reinforced cement-based composite material, ECC has ductility higher, toughness, antidetonation, shock resistance, anti-
The advantages such as fatigue, selfreparing, durability.The use of ECC materials is greatly improved the service life of building, reduction building and exists
Total cost in the length of service, produces considerable economic benefit.Especially in concrete repair, ductility cement-base composite material high
Use can substantially reduce shunk due to patching material caused by the endurance issues that ftracture and its cause.
Based on the superior performances of ECC, the material is in the U.S., such as existing many engineering examples of Japan and Europe, bridge floor
Plate repairing, the maintenance of dam maintenance and reinforcement, railway overpass, jointless floorings, Zurich railway terminus extension project, steel reinforced concrete
Miscellaneous structure etc..Although many type ECC are developed and utilize, almost no compression strength exceedes above-mentioned ECC
100MPa's, in the building structure that some need high intensity to weigh, existing ECC materials cannot still meet structural requirement.
Although the limit tensile strain of ECC is up to 3%~7%, for high-strength concrete, still suffer from present compression strength compared with
Low defect.Therefore, while holding ECC ductility high, its intensity how is improved as study hotspot in recent years.New York
ECC basic theories is applied to high-strength concrete by Ravi doctors Ranade in vertical university's Buffalo branch school, successfully prepares height
- Gao Yan ECC by force, its mean compressive strength and ultimate tensile strength are respectively 160MPa and 3.5%.And at home, the current neck
Can the research in domain still belongs to blank, gather materials on the spot and successfully develop the strong superelevation ductility cement base of superelevation for meeting domestic market demand
Composite is extremely urgent.
The present invention successfully solves above mentioned problem, this seminar comprehensive utilization Micromechanics, fracture mechanics and statistical
Research method, by substantial amounts of experimental study, successfully prepares intensity more than the strong superelevation of superelevation that 150MPa, ductility reach 5%
Ductility cement-base composite material, to meet some important engineerings to cement-based material intensity and the double requirements of ductility.
Patent CN103664090A discloses " ductility cement-base composite material high and its preparation side that a kind of fiber is mixed again
Method ", although the intensity highest that the material also has ductility higher, the embodiment listed by the patent also only has 78.6MPa, this
The compression strength of the material prepared by patent more than 150MPa, from design theory, raw material choose to preparation work by this patent
The aspects such as skill are and above-mentioned patent has significant difference, cannot be deduced by above-mentioned patent methods described at all or be tested come
The material in this method is prepared, the present invention has significant novelty.
The content of the invention
It is an object of the invention to provide a kind of preparation method of the strong superelevation ductility cement-base composite material of superelevation, institute's saw lumber
The features such as material has superhigh intensity, superelevation ductility, good frost resistance, lower shrinkage, low water absorption.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of strong superelevation ductility cement-base composite material of superelevation, the compression strength of the cement-base composite material exceedes
150MPa, the ductility under uniaxial tension load is more than 5%.
The material is constituted：The mix water consumption ratio of mud is expressed as 0.17~0.23, and the volumn concentration of fiber is
2.0~2.5%, other components are made up of the component of following weight/mass percentage composition：Cement 36%~57%, silicon ash 11%~
21%, consistency modifiers 5%~13%, flyash 5%~15%, sand 19~26%, silicon ash dispersed modifier 0.021~
0.043%, water reducer 2.957%~2.979%.
Described cement is marked as 52.5 grades of portland cements.
Described silicon ash is commercially available common silicon ash, its SiO2Content is more than 92%.
Described consistency modifiers are adjusted for commercially available high-quality denseness.
Described flyash is I grades of Class F fly ash of high-quality F classes, the wherein mass content of free CaO<1%.
Described sand is common river sand, and maximum particle diameter is not more than 600 μm.
Described fiber be polyethylene fibre, fibre length be 6mm~12mm, a diameter of 12~39 μm, Dan Mo Liang≤
100GPa, Ultimate Tensile intensity≤2500MPa, elongation at break 2~6%.
Described silicon ash dispersed modifier is KH551 (3- aminopropyl trimethoxysilanes), KH902 (3- aminopropyltriethoxies
Diethoxy silane), KH792 (N- (β-aminoethyl)-γ-aminopropyltrimethoxysilane), KH791 (N- (β-aminoethyl)-
Gamma-aminopropyl-triethoxy-silane), the one kind in KH602 (N- (β-aminoethyl)-γ-aminopropyltriethoxy dimethoxysilane).
Described water reducer is polycarboxylic acid series high efficiency water reducing agent, its solid content >=40%, water-reducing rate >=40%.
A kind of method for preparing the strong superelevation ductility cement-base composite material of above-mentioned superelevation, comprises the following steps：
To mix with water by the load weighted silicon ash dispersed modifier of predetermined match ratio and water reducer first, be configured to solution,
Then will mix in cement plaster blender with the solution that above-mentioned steps are configured by the load weighted silicon ash of preset blending ratio, with
The rotating speed of 140r/min is stirred 1-2 minutes slowly；Then sequentially add by the load weighted cement of preset blending ratio, consistency modifiers, fine coal
Ash, sand, are stirred 1-2 minutes, then stirred soon 2-4 minutes with the rotating speed of 285r/min slowly with the rotating speed of 140r/min；It is subsequently adding pre-
First load weighted fiber, is stirred 1-2 minutes, then stirred soon 4-6 minutes with the rotating speed of 285r/min slowly with the rotating speed of 140r/min；Then
The mould of specification is taken, vibration moulding is poured into a mould, it is then with trowel that its surface is floating, stand the demoulding after 12~24h, 20 DEG C of marks
Quasi- 28 days or 60 DEG C~90 DEG C of maintenance steam curing 3 days, obtains final product the strong superelevation ductility cement-base composite material of superelevation.
Beneficial effect：The present invention gathers materials on the spot, and successfully prepares compression strength more than 150MPa, and ductility is super more than 5%
High-strength superelevation ductility cement-base composite material, breaches the bottleneck that ECC intensity is difficult more than 100MPa, higher to prepare intensity
ECC provides strong evidence and new Research Thinking, and as a kind of new material, while some important engineerings can be met again
To cement-based material intensity and the double requirements of ductility.For common ECC, the present invention is significant, compensate for state
The blank in the interior strong superelevation ductility cement-base composite material field of superelevation.
Brief description of the drawings
Fig. 1 is the uniaxial tensile test result schematic diagram of embodiment 1；
Fig. 2 is the uniaxial tensile test result schematic diagram of embodiment 2；
Fig. 3 is the uniaxial tensile test result schematic diagram of embodiment 3；
Fig. 4 is the uniaxial tensile test result schematic diagram of embodiment 4；
Fig. 5 is the uniaxial tensile test result schematic diagram of embodiment 5.
Specific embodiment
The present invention is further illustrated below by embodiment.
Uniaxial tension, compression strength, rupture strength test：Reference《Ductility fiber reinforced cement-based composite material performance high
Test method (draft)》In relevant test method be measured.
Linear shrinkage, water absorption rate, frost resistance are determined：With reference to JGJ/T 70-2009《Building mortar basic performance tests side
Method standard》In relevant test method be measured.
Embodiment 1
A kind of strong superelevation ductility cement-base composite material of superelevation, the composition of the material is：Mix water consumption ratio of mud table
0.17 is shown as, the volumn concentration of fiber is 2.5%, and other components are made up of the component of following weight/mass percentage composition：Cement
It is 57%, silicon ash is 11%, consistency modifiers are 5%, flyash is 5%, sand 19%, silicon ash dispersed modifier is
0.021%, water reducer is 2.979%.
Wherein, cement is marked as 52.5 grades of portland cements；Silicon ash is commercially available common silicon ash, its SiO2Content is more than
92%；Consistency modifiers are commercially available high-quality consistency modifiers；Flyash of the present invention is I grades of Class F fly ash of high-quality F classes,
The wherein mass content of free CaO<1%；Sand of the present invention is common river sand, and maximum particle diameter is not more than 600 μm；Fiber
It is high-strength and high-modulus PE (polyethylene) fiber, fibre length is 6mm~12mm, a diameter of 12~39 μm, Dan Mo Liang≤100GPa,
Ultimate Tensile intensity≤2500MPa, elongation at break 2~6%；Silicon ash dispersed modifier uses KH551 (3- aminopropyl trimethoxies
Base silane)；Water reducer is polycarboxylic acid series high efficiency water reducing agent, its solid content >=40%, water-reducing rate >=40%.
Embodiment 2
A kind of strong superelevation ductility cement-base composite material of superelevation, the composition of the material is：Mix water consumption ratio of mud table
0.20 is shown as, the volumn concentration of fiber is 2.3%, and other components are made up of the component of following weight/mass percentage composition：Cement
It is 39%, silicon ash is 12%, consistency modifiers are 9%, flyash is 14%, sand 23%, silicon ash dispersed modifier is
0.031%, water reducer is 2.969%.
Wherein, silicon ash dispersed modifier uses KH792 (N- (β-aminoethyl)-γ-aminopropyltrimethoxysilane), other
The raw material that component is used is with embodiment 1.
Embodiment 3
A kind of strong superelevation ductility cement-base composite material of superelevation, the composition of the material is：Mix water consumption ratio of mud table
0.21 is shown as, the volumn concentration of fiber is 2.4%, and other components are made up of the component of following weight/mass percentage composition：Cement
It is 36%, silicon ash is 19%, consistency modifiers are 13%, flyash is 7%, sand 22%, silicon ash dispersed modifier is
0.039%, water reducer is 2.961%.
Wherein, silicon ash dispersed modifier uses KH902 (3- aminopropyltriethoxies diethoxy silane), and other components are used
Raw material with embodiment 1.
Embodiment 4
A kind of strong superelevation ductility cement-base composite material of superelevation, the composition of the material is：Mix water consumption ratio of mud table
0.23 is shown as, the volumn concentration of fiber is 2.0%, and other components are made up of the component of following weight/mass percentage composition：Cement
It is 36%, silicon ash is 21%, consistency modifiers are 8%, flyash is 10%, sand 20%, silicon ash dispersed modifier is
0.043%, water reducer is 2.957%.
Wherein, silicon ash dispersed modifier uses KH791 (N- (β-aminoethyl)-gamma-aminopropyl-triethoxy-silane), other
The raw material that component is used is with embodiment 1.
Embodiment 5
A kind of strong superelevation ductility cement-base composite material of superelevation, the composition of the material is：Mix water consumption ratio of mud table
0.19 is shown as, the volumn concentration of fiber is 2.2%, and other components are made up of the component of following weight/mass percentage composition：Cement
It is 36%, silicon ash is 12%, consistency modifiers are 6%, flyash is 15%, sand 26%, silicon ash dispersed modifier is
0.037%, water reducer is 2.963%.
Wherein, silicon ash dispersed modifier uses KH602 (N- (β-aminoethyl)-γ-aminopropyltriethoxy dimethoxysilane),
The raw material that other components are used is with embodiment 1.
The preparation method of the strong superelevation ductility cement-base composite material of superelevation described in embodiment 1- embodiments 5, including it is following
Step：
To mix with water by the load weighted silicon ash dispersed modifier of predetermined match ratio and water reducer first, then will be by predetermined
Match load weighted silicon ash and mix in cement plaster blender with the solution for having configured, 1-2 is stirred with the rotating speed of 140r/min slowly
Minute；Then sequentially add by the load weighted cement of preset blending ratio, consistency modifiers, flyash, sand, with turning for 140r/min
Speed is stirred 1-2 minutes slowly, is stirred soon 2-4 minutes with the rotating speed of 285r/min；Advance load weighted fiber is subsequently adding, with 140r/min
Rotating speed stir slowly 1-2 minutes, stirred soon 4-6 minutes with the rotating speed of 285r/min.Then the mould of specification is taken, cast is vibrated into
Type, it is then with trowel that its surface is floating, stand the demoulding, 20 DEG C of standard curings, 28 days or 60 DEG C~90 DEG C steam after 12~24h
Maintenance 3 days, obtains final product the strong superelevation ductility cement-base composite material of superelevation.Relevant parameter test result is as shown in table 1, Fig. 1-Fig. 5：
Table 1
The result that table 1 is surveyed shows that the strong superelevation ductility cement-base composite material properties of superelevation prepared by the present invention are excellent
Good, intensity reaches more than 5% more than 150MPa, ductility, compensate for the strong superelevation ductility cement-base composite material field of domestic superelevation
Blank.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Those of ordinary skill in the art disclosed herein technical scope in, the change that can expect without creative work or
Replace, should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be limited with claims
Fixed protection domain is defined.
Claims (9)
1. the strong superelevation ductility cement-base composite material of a kind of superelevation, it is characterised in that：The compression strength of the cement-base composite material
More than 150MPa, the ductility under uniaxial tension load is more than 5%.
2. the strong superelevation ductility cement-base composite material of superelevation according to claim 1, it is characterised in that：The material is constituted
For：The mix water consumption ratio of mud is expressed as 0.17~0.23, and the volumn concentration of fiber is 2.0~2.5%, other components
It is made up of the component of following weight/mass percentage composition：Cement 36%~57%, silicon ash 11%~21%, consistency modifiers 5%~
13%, flyash 5%~15%, sand 19~26%, silicon ash dispersed modifier 0.021~0.043%, water reducer 2.957%
~2.979%.
3. the strong superelevation ductility cement-base composite material of superelevation according to claim 2, it is characterised in that：Described cement is
Marked as 52.5 grades of portland cements；Described silicon ash is commercially available common silicon ash, its SiO2Content is more than 92%；Described denseness
Conditioning agent is adjusted for commercially available high-quality denseness.
4. the strong superelevation ductility cement-base composite material of superelevation according to claim 2, it is characterised in that：Described flyash
It is I grades of Class F fly ash of high-quality F classes, the wherein mass content of free CaO<1%.
5. the strong superelevation ductility cement-base composite material of superelevation according to claim 2, it is characterised in that：Described sand is
Common river sand, maximum particle diameter is not more than 600 μm.
6. the strong superelevation ductility cement-base composite material of superelevation according to claim 2, it is characterised in that：Described fiber is
Polyethylene fibre, fibre length is 6mm~12mm, a diameter of 12~39 μm, bullet property mould amount≤100GPa, Ultimate Tensile intensity≤
2500MPa, elongation at break 2~6%.
7. the strong superelevation ductility cement-base composite material of superelevation according to claim 2, it is characterised in that：Described silicon ash point
It is the one kind in KH551, KH902, KH792, KH791, KH602 to dissipate modifying agent.
8. the strong superelevation ductility cement-base composite material of superelevation according to claim 2, it is characterised in that：Described water reducer
It is polycarboxylic acid series high efficiency water reducing agent, its solid content >=40%, water-reducing rate >=40%.
9. the method for the strong superelevation ductility cement-base composite material of a kind of superelevation prepared as described in claim 1~7 is any, it is special
Levy and be：Comprise the following steps：
To mix with water by the load weighted silicon ash dispersed modifier of predetermined match ratio and water reducer first, be configured to solution, then
To mix in cement plaster blender with the solution that above-mentioned steps are configured by the load weighted silicon ash of preset blending ratio, with 140r/
The rotating speed of min is stirred 1-2 minutes slowly；Then sequentially add by the load weighted cement of preset blending ratio, consistency modifiers, flyash, sand
Son, is stirred 1-2 minutes slowly with the rotating speed of 140r/min, then is stirred soon 2-4 minutes with the rotating speed of 285r/min；It is subsequently adding weighing in advance
Good fiber, is stirred 1-2 minutes, then stirred soon 4-6 minutes with the rotating speed of 285r/min slowly with the rotating speed of 140r/min；Then specification is taken
The mould of size, pours into a mould vibration moulding, then with trowel that its surface is floating, stands the demoulding, 20 DEG C of standard curings after 12~24h
28 days or 60 DEG C~90 DEG C steam curing 3 days, obtains final product the strong superelevation ductility cement-base composite material of superelevation.
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| CN107382180A (en) * | 2017-06-12 | 2017-11-24 | 东南大学 | A kind of high ductility enhanced water resistance cement-base composite material of high intensity and preparation method thereof |
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| CN110240449A (en) * | 2019-06-25 | 2019-09-17 | 东南大学 | A kind of high ductility ocean concrete material of superhigh intensity and preparation method thereof |
| CN110627442A (en) * | 2019-10-14 | 2019-12-31 | 北京工业大学 | Fiber grid reinforced hybrid fiber high-strength and high-ductility cement-based composite material manhole cover and preparation method thereof |
| CN112979195A (en) * | 2021-02-05 | 2021-06-18 | 山东大学 | Super absorbent fiber cement-based self-repairing material and preparation method thereof |
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| CN107651907A (en) * | 2017-09-18 | 2018-02-02 | 东南大学 | The environmental high ductility cement-base composite material and method prepared with organic waste |
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