CN108821690A - A kind of preparation method for the MOF high performance concrete that intensity high convergency is small - Google Patents
A kind of preparation method for the MOF high performance concrete that intensity high convergency is small Download PDFInfo
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- CN108821690A CN108821690A CN201810805804.7A CN201810805804A CN108821690A CN 108821690 A CN108821690 A CN 108821690A CN 201810805804 A CN201810805804 A CN 201810805804A CN 108821690 A CN108821690 A CN 108821690A
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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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
Abstract
A kind of preparation method for the MOF high performance concrete that intensity high convergency is small, is related to the field of building materials, measures by mass percentage as follows：(1) cement：15%-20%；(2) mineral admixture：5%-10%；(3) coarse aggregate：42%-47%；(4) fine aggregate：28%-33%；(5) water-reducing agent：The 1%-2% of cementitious material quality；(6)MOF：The 1%-3% of cementitious material quality；(7) surfactant：The 1%-3% of cementitious material quality.Into the water by component (6) and (7), then component (5) is put into the dispersion liquid after ultrasonic disperse after ultrasonic disperse 120 minutes, is stirred 30 minutes.Above-mentioned gained dispersion liquid and component (1), (2), (3) and (4) are put into concrete mixer and are stirred evenly, high performance concrete is obtained.Concrete anti-compression of the present invention, tensile strength are high, shrink small, can effectively solve the problems, such as concrete cracking, improve the durability of concrete.The concrete is not necessarily to special curing, is easy to site operation.
Description
Technical field
The present invention relates to a kind of techniques of MOF high performance concrete that intensity high convergency is small, belong to building material technology neck
Domain can effectively solve the problems, such as concrete bracing.
Background technique
Metal-organic framework materials (Metal-organic frameworks, MOF) are that a kind of multidimensional is periodically porous
Skeleton, master are coordinated by metal ion and the organic ligand (Organic linker) containing N or O.In recent years, MOF is because of it
Excellent performance and rapidly develop.MOF has many advantages, such as high-specific surface area and adjustable aperture, therefore, can be applied to gas
With liquid adsorption field.MOF absorption-desorption hydrone is exactly one of material application.
Currently, high performance concrete is widely used in engineering.Compared with normal concrete, high-performance is prepared
The lower ratio of mud is used when concrete, therefore, inside concrete self-desiccation phenomenon is obvious, thus the receipts certainly of caused concrete
It contracts also bigger, even becomes the main contraction mode of concrete.The biggish self-constriction of high performance concrete will lead to cracking,
The bearing capacity and durability for reducing concrete structure generate huge harm to structure.
To solve the above problems, the present invention provides a kind of preparation sides of MOF high performance concrete that intensity high convergency is small
Method.The present invention uses interior maintenance principle to achieve the purpose that reduce self-constriction.High-performance is reduced using interior maintenance principle in the past
In the research of concrete shrinkage, researcher adds into the porous full water material such as haydite, bloating shale, although can reduce contraction,
But often concrete strength is reduced.The present invention uses nano material MOF, so that the self-constriction of concrete is obviously reduced, and
And its intensity does not reduce not only, or even has certain amplitude raising, can effectively improve the bearing capacity of concrete structure and resistance to
Long property, reduces maintenance cost.
Summary of the invention
The technical problem to be solved by the present invention is to：The problems such as big, easy to crack for high performance concrete self-constriction, discloses
A kind of preparation method for the MOF high performance concrete that intensity high convergency is small.
The present invention can be achieved through the following technical solutions：A kind of MOF high performance concrete system that intensity high convergency is small
Preparation Method is measured by percentage to the quality, and component is as follows：
(1) cement：15%-20%；
(2) mineral admixture：5%-10%；
(3) coarse aggregate：42%-47%；
(4) fine aggregate：28%-33%；
Above four kinds are collectively referred to as cementitious material, add up to 100%；
(5) water-reducing agent：The 1%-2% of cementitious material quality；
(6)MOF：The 1%-3% of cementitious material quality；
(7) surfactant：The 1%-3% of cementitious material quality.
The cement is ordinary portland cement P.O.42.5.
The mineral admixture is specific surface area 0.4-0.6m2The I grade or II grades of flyash of/g, specific surface area 20-
28m2/ g silicon ash.
The coarse aggregate is rubble, particle size range 5-16mm.
The fine aggregate is middle sand.
The water-reducing agent is the polycarboxylate water-reducer that solid content is greater than 20%.
The MOF is Cr-MIL-101, specific surface area 5000-6000m2/ g, mesoporous pore size 3-3.4nm.
The surfactant is lauryl sodium sulfate (SDS).
A kind of preparation method of MOF high performance concrete that intensity high convergency is small, preparation step are as follows：
1. adsorbing：The MOF of precise according to the ratio is put into the closed container of relative humidity 100%, applies 1.2-1.5
A atmospheric pressure makes it adsorb water vapour, until saturation.
2. dispersing：By water, surfactant and water-reducing agent press quality proportioning precise, 1. MOF that step is obtained and
Surfactant into the water, ultrasonic disperse 120 minutes, obtains MOF dispersion liquid, water-reducing agent is then dissolved in above-mentioned dispersion liquid
In, it stirs 30 minutes.
3. weighing：According to the quality proportioning of remaining each component, accurately weigh weigh cement, mineral admixture, coarse aggregate and
Fine aggregate.
4. stirring：2. material that step is obtained is sequentially placed into concrete mixer, point for then 1. obtaining step
The 2/3 of dispersion liquid is put into blender, stirs 3 minutes, remaining 1/3 dispersion liquid is put into blender again later, stirs 5 minutes,
Obtain the small MOF high performance concrete of the intensity high convergency.
A kind of preparation process for the MOF high performance concrete that intensity high convergency is small, major technique innovative point are：It utilizes
The performance of MOF (MOF used in the present invention is Cr-MIL-101) excellent absorption-desorption and stable structure, reaches reduction coagulation
Soil shrinks, improves the purpose of its intensity.Cr-MIL-101 has excellent water stability, structure can be kept for a long time steady in water
When determining, therefore dispersing Cr-MIL-101 in water, its structure can't be destroyed；Meanwhile under high pressure, the structure of Cr-MIL-101
It not will receive destruction, allow to be stabilized in concrete.When hydrated cementitious consumption mixing water causes in inside concrete
When self-desiccation phenomenon, capillary stress is larger in fractional saturation pore, to generate self-constriction.And saturation absorption is added wherein
After the Cr-MIL-101 of hydrone, when capillary stress increase when, under pressure, Cr-MIL-101 is desorbed, make water from
Cr-MIL-101 is released, and compensates the moisture loss of hydrated cementitious, alleviates self-desiccation phenomenon, reduces self-constriction, reduces coagulation
The risk that soil cracks.In addition, the water that Cr-MIL-101 is released can promote hydration reaction, increase the generation of C-S-H gel
Amount, improves the intensity of concrete；And Cr-MIL-101 self structure has very high bearing capacity, to further mention
The high intensity of concrete.
The small MOF Strength of High Performance Concrete of the intensity high convergency that this method obtains is high, it is small to shrink, and can effectively reduce cracking
Risk, improves the durability of concrete structure, while being easy to construct, and has extensive practical value.Compared with prior art, originally
Invention has the following advantages：
(1) small MOF high performance concrete its self-constriction of intensity high convergency provided by the invention is small, mixed with existing high-performance
Solidifying soil is compared, and cracking risk can be greatly reduced, and reduces maintenance cost.
(2) the small MOF high performance concrete compression strength of intensity high convergency provided by the invention is high, and due to Cr-
MIL-101 gradually discharges moisture, and later strength is still improved.
(3) it is mixed to be different from existing change for the small MOF high performance concrete preparation method of intensity high convergency provided by the invention
The technology of solidifying soil nature energy, the present invention change the contraction and intensity of concrete from nanoscale, provide to promote concrete performance
A kind of new method.
Specific embodiment
Further to embody effect brought by the present invention, below with reference to concrete application case to of the invention further detailed
It describes in detail bright.
Mineral admixture described in example is that specific surface area is 0.4-0.6m2The I grade or II grades of flyash of/g, and compare table
Area is 20-28m2The silicon ash of/g.The coarse aggregate is rubble, particle size range 5-16mm.The fine aggregate is middle sand.Institute
The MOF stated is Cr-MIL-101, specific surface area 5000-6000m2/ g, mesoporous pore size 3-3.4nm.
Example 1：
A kind of preparation method for the MOF high performance concrete that intensity high convergency is small, is measured, component is such as by percentage to the quality
Under：
(1) ordinary portland cement P.O.42.5：15%；
(2) I grades of flyash：6%
(3) silicon ash：4%；
(4) rubble：42%；
(5) river sand：33%；
The DH-4004 type polycarboxylate water-reducer of (6) 22% solid contents：The 2% of cementitious material quality；
(7)Cr-MIL-101：The 1% of cementitious material quality；
(8) lauryl sodium sulfate：The 1% of cementitious material quality；
Using water-cement ratio 0.28, according to the preparation method of the small MOF high performance concrete of intensity high convergency, step is such as
Under：
1. adsorbing：The Cr-MIL-101 of precise according to the ratio is put into the closed container of relative humidity 100%, is applied
1.2 atmospheric pressure make it adsorb water vapour, until saturation.
2. dispersing：According to design water-cement ratio 0.28, drinking water, lauryl sodium sulfate and polycarboxylate water-reducer are pressed into quality
Proportion speed weighs, and into the water, ultrasonic disperse 120 divides 1. Cr-MIL-101 and lauryl sodium sulfate that step is obtained
Clock obtains Cr-MIL-101 dispersion liquid, and then polycarboxylate water-reducer is dissolved in above-mentioned dispersion liquid, stirs 30 minutes.
3. weighing：According to the quality proportioning of remaining each component, cement, flyash, silicon ash, rubble and river sand are accurately weighed.
4. stirring：2. material that step is obtained is sequentially placed into concrete mixer, point for then 1. obtaining step
The 2/3 of dispersion liquid is put into blender, stirs 3 minutes, remaining 1/3 dispersion liquid is put into blender again later, stirs 5 minutes,
Obtain the small MOF high performance concrete of the intensity high convergency.
Example 2
A kind of preparation method for the MOF high performance concrete that intensity high convergency is small, is measured, component is such as by percentage to the quality
Under：
(1) ordinary portland cement P.O.42.5：17%；
(2) I grades of flyash：5%
(3) silicon ash：3%；
(4) rubble：45%；
(5) river sand：30%；
The DH-4004 type polycarboxylate water-reducer of (6) 24% solid contents：The 1.5% of cementitious material quality；
(7)Cr-MIL-101：The 2% of cementitious material quality；
(8) lauryl sodium sulfate：The 2% of cementitious material quality；
Using water-cement ratio 0.28, according to the preparation method of the small MOF high performance concrete of intensity high convergency, step is such as
Under：
1. adsorbing：The Cr-MIL-101 of precise according to the ratio is put into the closed container of relative humidity 100%, is applied
1.5 atmospheric pressure make it adsorb water vapour, until saturation.
2. dispersing：According to design water-cement ratio 0.28, drinking water, lauryl sodium sulfate and polycarboxylate water-reducer are pressed into quality
Proportion speed weighs, and into the water, ultrasonic disperse 120 divides 1. Cr-MIL-101 and lauryl sodium sulfate that step is obtained
Clock obtains Cr-MIL-101 dispersion liquid, and then polycarboxylate water-reducer is dissolved in above-mentioned dispersion liquid, stirs 30 minutes.
3. weighing：According to the quality proportioning of remaining each component, cement, flyash, silicon ash, rubble and river sand are accurately weighed.
4. stirring：2. material that step is obtained is sequentially placed into concrete mixer, point for then 1. obtaining step
The 2/3 of dispersion liquid is put into blender, stirs 3 minutes, remaining 1/3 dispersion liquid is put into blender again later, stirs 5 minutes,
Obtain the small MOF high performance concrete of the intensity high convergency.
Example 3
A kind of preparation method for the MOF high performance concrete that intensity high convergency is small, is measured, component is such as by percentage to the quality
Under：
(1) ordinary portland cement P.O.42.5：20%；
(2) I grades of flyash：3%
(3) silicon ash：2%；
(4) rubble：47%；
(5) river sand：28%；
The DH-4004 type polycarboxylate water-reducer of (6) 20% solid contents：The 1% of cementitious material quality；
(7)Cr-MIL-101：The 3% of cementitious material quality；
(8) lauryl sodium sulfate：The 3% of cementitious material quality；
Using water-cement ratio 0.28, according to the preparation method of the small MOF high performance concrete of intensity high convergency, step is such as
Under：
1. adsorbing：The Cr-MIL-101 of precise according to the ratio is put into the closed container of relative humidity 100%, is applied
1.3 atmospheric pressure make it adsorb water vapour, until saturation.
2. dispersing：According to design water-cement ratio 0.28, drinking water, lauryl sodium sulfate and polycarboxylate water-reducer are pressed into quality
Proportion speed weighs, and into the water, ultrasonic disperse 120 divides 1. Cr-MIL-101 and lauryl sodium sulfate that step is obtained
Clock obtains Cr-MIL-101 dispersion liquid, and then polycarboxylate water-reducer is dissolved in above-mentioned dispersion liquid, stirs 30 minutes.
3. weighing：According to the quality proportioning of remaining each component, cement, flyash, silicon ash, rubble and river sand are accurately weighed.
4. stirring：2. material that step is obtained is sequentially placed into concrete mixer, point for then 1. obtaining step
The 2/3 of dispersion liquid is put into blender, stirs 3 minutes, remaining 1/3 dispersion liquid is put into blender again later, stirs 5 minutes,
Obtain the small MOF high performance concrete of the intensity high convergency.
Experimental result
Above-mentioned experimental group carries out it according to specification to the test of 28d compression strength and 28d self-constriction.3 groups of setting simultaneously
Control group (control group 1, control group 2 and control group 3).Control group 1,2 and 3 is in addition to without containing MOF and surfactant, remaining material
Material and proportion are identical as experimental group 1,2 and 3 respectively, and the test of 28d compression strength and 28d self-constriction is carried out under similarity condition.
Test result is as shown in table 1.
As shown in Table 1, compared with the control group, after mixing MOF, 28d compression strength is improved example 1,2 and 3, improves
Amplitude maximum is up to 20% or so；And 28d self-shrinking value is then greatly lowered, maximum can reduce nearly 50%.Result in table 1
It illustrates that the MOF of absorption water has apparent advantage in terms of improving concrete strength, reducing concrete self-shrinkage, is nanometer ruler
The research that degree changes concrete performance lays the foundation.
1 example 1-3 of table is compared with the result of control group 1-3
| Test item | Example 1 | Control 1 | Example 2 | Control 2 | Example 3 | Control 3 |
| 28d compression strength/MPa | 87.4 | 72.6 | 92.3 | 74.4 | 91.8 | 77.5 |
| 28d self-constriction/μ ε | 184 | 267 | 156 | 258 | 137 | 271 |
Claims (9)
1. a kind of preparation method for the MOF high performance concrete that intensity high convergency is small, main component are measured by mass percentage
It is as follows：
(1) cement：15%-20%；
(2) mineral admixture：5%-10%；
(3) coarse aggregate：42%-47%；
(4) fine aggregate：28%-33%；
Above four kinds are collectively referred to as cementitious material, add up to 100%；
(5) water-reducing agent：The 1%-2% of cementitious material quality；
(6)MOF：The 1%-3% of cementitious material quality；
(7) surfactant：The 1%-3% of cementitious material quality.
2. a kind of preparation method of MOF high performance concrete that intensity high convergency is small according to claim 1, the water
Mud is ordinary portland cement P.O.42.5.
3. a kind of preparation method of MOF high performance concrete that intensity high convergency is small according to claim 1, the mine
Polymer blends material is that specific surface area is 0.4-0.6m2The I grade of/g or II grades of flyash and specific surface area are 20-28m2The silicon ash of/g.
4. a kind of preparation method of MOF high performance concrete that intensity high convergency is small according to claim 1, described is thick
Gather materials for rubble, particle size range 5-16mm.
5. a kind of preparation method of MOF high performance concrete that intensity high convergency is small according to claim 1, described is thin
Gather materials for middle sand.
6. a kind of preparation method of MOF high performance concrete that intensity high convergency is small according to claim 1, described subtracts
Aqua is the polycarboxylate water-reducer that solid content is greater than 20%.
7. a kind of preparation method of MOF high performance concrete that intensity high convergency is small according to claim 1, described
MOF is Cr-MIL-101, specific surface area 5000-6000m2/ g, mesoporous pore size 3-3.4nm.
8. a kind of preparation method of MOF high performance concrete that intensity high convergency is small according to claim 1, the table
Face activating agent is lauryl sodium sulfate.
9. a kind of preparation method of MOF high performance concrete that intensity high convergency is small according to claim 1, preparation step
It is rapid as follows：
1. adsorbing：The MOF of precise according to the ratio is put into the closed container of relative humidity 100%, is applied 1.2-1.5 big
Air pressure makes it adsorb water vapour, until saturation.
2. dispersing：According to design water-cement ratio, water, surfactant and water-reducing agent are pressed into quality proportioning precise, 1. by step
Obtained MOF and surfactant into the water, ultrasonic disperse 120 minutes, obtains MOF dispersion liquid, is then dissolved in water-reducing agent
In above-mentioned dispersion liquid, stir 30 minutes.
3. weighing：According to the quality proportioning of remaining each component, cement, mineral admixture, coarse aggregate and fine aggregate are accurately weighed.
4. stirring：2. material that step is obtained is sequentially placed into concrete mixer, the dispersion liquid for then 1. obtaining step
2/3 be put into blender, stir 3 minutes, remaining 1/3 dispersion liquid be put into blender again later, stir 5 minutes, obtain
Product.
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| CN115949090A (en) * | 2022-12-30 | 2023-04-11 | 国网山东省电力公司菏泽供电公司 | Steel fiber concrete assembled ring main unit foundation and preparation process thereof |
| CN115949090B (en) * | 2022-12-30 | 2023-08-25 | 国网山东省电力公司菏泽供电公司 | Steel fiber concrete assembled ring main unit foundation and preparation process thereof |
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