CN114195457A - Concrete and preparation method thereof - Google Patents
Concrete and preparation method thereof Download PDFInfo
- Publication number
- CN114195457A CN114195457A CN202111589892.XA CN202111589892A CN114195457A CN 114195457 A CN114195457 A CN 114195457A CN 202111589892 A CN202111589892 A CN 202111589892A CN 114195457 A CN114195457 A CN 114195457A
- Authority
- CN
- China
- Prior art keywords
- concrete
- dosage
- sand
- cement
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 239000004567 concrete Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000004576 sand Substances 0.000 claims abstract description 22
- 239000004743 Polypropylene Substances 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 17
- -1 polypropylene Polymers 0.000 claims abstract description 17
- 229920001155 polypropylene Polymers 0.000 claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000010881 fly ash Substances 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 12
- 239000004575 stone Substances 0.000 claims abstract description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 10
- 239000011707 mineral Substances 0.000 claims abstract description 10
- 230000003487 anti-permeability effect Effects 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 9
- UFWIBTONFRDIAS-UHFFFAOYSA-N naphthalene-acid Natural products C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 125000001624 naphthyl group Chemical group 0.000 claims description 2
- 239000008030 superplasticizer Substances 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to concrete, which is characterized in that: the concrete is prepared by mixing cement, mineral powder, fly ash, sand, stones, water, a water reducing agent, a synergist, polypropylene fibers and a calcareous expansive anti-permeability agent. The invention can prevent the concrete from cracking, improve the quality of the concrete and prolong the service life of the concrete.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to concrete and a preparation method thereof.
Background
The cracks common to concrete are mostly surface cracks of different depths. Concrete cracks are divided into macroscopic cracks and microscopic cracks. The micro cracks are also called controllable cracks, and the micro cracks are three types, namely, the cracks on the bonding surface of the aggregate and the set cement, the cracks of the set cement, and the cracks of the aggregate, wherein the micro cracks are irregularly distributed in the concrete structure and are not communicated, cannot be seen by naked eyes, are determined by the physical and mechanical properties of the micro cracks, and the harmful degree of the micro cracks can be controlled. Macroscopic cracks are visible cracks, generally not less than 0.05mm, and microscopic cracks are developed, and the degree of harmfulness is determined according to the use conditions, such as structural durability requirements, bearing capacity requirements and normal use requirements, and the most strict allowable crack width is 0.1 mm. If the structure is in a normal environment, the thickness of the protective layer meets the design requirement and the medium is not corroded, the width of the concrete crack can be allowed to be within 0.4 mm; the soil is covered by non-erosion medium under water frequently, and the width of the concrete crack is allowed to be within 0.3 mm; in the environment of alternating sea water and dry and wet, the width of the concrete crack is allowed to be within 0.15 mm. When there are aggressive media along the crack, the level of harmfulness is high and concrete crack control must be performed. Therefore, the concrete in the prior art has the fatal defects of low tensile strength and easy cracking, thereby reducing the bearing capacity of the concrete structure, shortening the service life and becoming the hidden danger of various disasters.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the concrete and the preparation method thereof, so that the concrete is prevented from cracking, the quality of the concrete is improved, and the service life of the concrete is prolonged.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the concrete is prepared by mixing cement, mineral powder, fly ash, sand, stones, water, a water reducing agent, a synergist, polypropylene fibers and a calcareous expansive anti-permeability agent;
wherein, relative to 1000kg of stones, the dosage of the cement is 450kg of 350-plus-sand, the dosage of the mineral powder is 50-80kg, the dosage of the fly ash is 30-60kg, the dosage of the sand is 880kg of 680-plus-sand, the dosage of the water is 200kg of 130-plus-sand, the dosage of the water reducing agent is 5-13kg, the dosage of the polypropylene fiber is 1-8kg, the dosage of the synergist is 2-5kg, and the dosage of the calcareous expansive impervious agent is 25-55 kg.
Furthermore, the particle size of the stones is 5-25 mm.
Furthermore, the fineness modulus of the sand is 2.8, and the grade II water-washed sand is prepared.
Further, the length of the polypropylene fiber is 4-40mm, the diameter of the polypropylene fiber is 5-100um, the breaking strength is more than or equal to 350mpa, the breaking elongation is less than or equal to 40 percent, and the density is 0.9-0.92g/cm3。
Further, the cement is ordinary portland cement with the reference number of 42.5.
Further, the ore powder is S95 grade ore powder.
Further, the fly ash is II-grade.
Further, the water reducing agent is a naphthalene-based high-efficiency water reducing agent.
A preparation method of concrete comprises the following steps,
step one, mixing and stirring stones, cement, mineral powder, fly ash, sand, water, a water reducing agent and polypropylene fibers for 2-5min, wherein the stirring temperature is 20-30 ℃;
and step two, adding a calcareous expansive impervious agent, mixing and stirring for 3-5min to prepare the concrete.
The invention has the beneficial effects that:
1. the calcium expanding agent can eliminate the early self-shrinkage of high-performance concrete and generate self-expansion. Under the condition of dry curing, the addition of the calcareous expanding agent also shows an obvious inhibiting effect on the dry shrinkage of high-performance concrete.
2. The polypropylene fiber has great improvement on the compressive strength, plastic cracking, crack resistance, impermeability and durability of concrete, and the compressive strength of the concrete reaches 28.63-48.63 MPa.
3. The reasonable mixing proportion and the doping of the calcareous expanding agent and the polypropylene fiber can obviously improve the cracking of the concrete, improve the quality of the concrete and prolong the service life of the concrete.
Detailed Description
The present invention is further explained below.
The concrete is prepared by mixing cement, mineral powder, fly ash, sand, stones, water, a water reducing agent, a synergist, polypropylene fibers and a calcareous expansive anti-permeability agent;
wherein the particle size of the stones is 5-25mm relative to 1000kg of the stones, 450kg of cement with the dosage of 350-80 kg, 42.5 ordinary portland cement with the label as cement, 50-80kg of mineral powder with the dosage of S95 level, 30-60kg of fly ash with the dosage of II level, 880kg of sand with the dosage of 680-880kg, 2.8 fineness modulus of sand, 200kg of water with the dosage of II level water washing sand, 5-13kg of water reducing agent with the dosage of naphthalene-based superplasticizer, 1-8kg of polypropylene fiber with the dosage of 4-40mm of polypropylene fiber, the diameter of the polypropylene fiber is 5-100um, the breaking strength is more than or equal to 350mpa, the breaking elongation is less than or equal to 40 percent, and the density is 0.9-0.92 g/cm.3The dosage of the synergist is 2-5kg, and the dosage of the calcium swelling anti-permeability agent is 25-55 kg.
Example 1
A preparation method of concrete comprises the following steps,
step one, mixing and stirring 1000kg of stones, 275kg of cement, 59kg of mineral powder, 38kg of fly ash, 760kg of sand, 173kg of water, 7.4kg of water reducing agent and 1kg of polypropylene fiber for 2min, wherein the stirring temperature is 25 ℃;
and step two, adding 45kg of calcareous expanding anti-permeability agent, mixing and stirring for 3min to prepare the concrete.
The concrete prepared by the method is subjected to compressive strength detection on A1 for 7 days and 28 days respectively, the detection results of three samples are shown in the following table,
therefore, the concrete crack can be prevented, the quality of the concrete is improved, and the service life of the concrete is prolonged.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the present invention are within the scope of the present invention.
Claims (9)
1. A concrete characterized by: the concrete is prepared by mixing cement, mineral powder, fly ash, sand, stones, water, a water reducing agent, a synergist, polypropylene fibers and a calcareous expanding anti-permeability agent;
wherein, relative to 1000kg of stones, the dosage of the cement is 450kg of 350-plus-sand, the dosage of the mineral powder is 50-80kg, the dosage of the fly ash is 30-60kg, the dosage of the sand is 880kg of 680-plus-sand, the dosage of the water is 200kg of 130-plus-sand, the dosage of the water reducing agent is 5-13kg, the dosage of the polypropylene fiber is 1-8kg, the dosage of the synergist is 2-5kg, and the dosage of the calcareous expansive impervious agent is 25-55 kg.
2. The concrete according to claim 1, wherein the pebbles have a particle size of 5 to 25 mm.
3. The concrete according to claim 1, wherein the sand has a fineness modulus of 2.8, class II washed sand.
4. The concrete according to claim 1, wherein the polypropylene fibers have a length of 4-40mm, a diameter of 5-100um, a breaking strength of 350mpa or more, an elongation at break of 40% or less, and a density of 0.9-0.92g/cm3。
5. Concrete according to claim 1, characterized in that the cement is ordinary portland cement with the reference number 42.5.
6. The concrete according to claim 1, wherein the ore fines are grade S95 ore fines.
7. The concrete of claim 1, wherein the fly ash is class II.
8. The concrete according to claim 1, wherein the water reducing agent is a naphthalene based superplasticizer.
9. A method of producing concrete comprising the concrete according to any one of claims 1 to 8, wherein: comprises the following steps of (a) carrying out,
step one, mixing and stirring stones, cement, mineral powder, fly ash, sand, water, a water reducing agent and polypropylene fibers for 2-5min, wherein the stirring temperature is 20-30 ℃;
and step two, adding a calcareous expansive impervious agent, mixing and stirring for 3-5min to prepare the concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111589892.XA CN114195457A (en) | 2021-12-23 | 2021-12-23 | Concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111589892.XA CN114195457A (en) | 2021-12-23 | 2021-12-23 | Concrete and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114195457A true CN114195457A (en) | 2022-03-18 |
Family
ID=80656190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111589892.XA Pending CN114195457A (en) | 2021-12-23 | 2021-12-23 | Concrete and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114195457A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005082416A (en) * | 2003-09-05 | 2005-03-31 | Denki Kagaku Kogyo Kk | Polymer cement composition, polymer cement grout mortar and repairing material using the same |
| CN105601199A (en) * | 2015-12-25 | 2016-05-25 | 邢台建工商品混凝土有限公司 | Expansive anti-crack fiber concrete and preparation method therefor |
| CN111470821A (en) * | 2020-04-26 | 2020-07-31 | 上海兆捷实业发展有限公司 | High-performance fiber concrete and preparation method thereof |
| CN111662053A (en) * | 2020-05-29 | 2020-09-15 | 中建科工集团有限公司 | Polypropylene fiber concrete and preparation method thereof |
-
2021
- 2021-12-23 CN CN202111589892.XA patent/CN114195457A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005082416A (en) * | 2003-09-05 | 2005-03-31 | Denki Kagaku Kogyo Kk | Polymer cement composition, polymer cement grout mortar and repairing material using the same |
| CN105601199A (en) * | 2015-12-25 | 2016-05-25 | 邢台建工商品混凝土有限公司 | Expansive anti-crack fiber concrete and preparation method therefor |
| CN111470821A (en) * | 2020-04-26 | 2020-07-31 | 上海兆捷实业发展有限公司 | High-performance fiber concrete and preparation method thereof |
| CN111662053A (en) * | 2020-05-29 | 2020-09-15 | 中建科工集团有限公司 | Polypropylene fiber concrete and preparation method thereof |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220318 |
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| RJ01 | Rejection of invention patent application after publication |