CN114180914A - High-strength concrete prepared by applying cobbles - Google Patents
High-strength concrete prepared by applying cobbles Download PDFInfo
- Publication number
- CN114180914A CN114180914A CN202111632203.9A CN202111632203A CN114180914A CN 114180914 A CN114180914 A CN 114180914A CN 202111632203 A CN202111632203 A CN 202111632203A CN 114180914 A CN114180914 A CN 114180914A
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- Prior art keywords
- cobbles
- strength concrete
- less
- cement
- concrete
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- 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.)
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Classifications
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
Abstract
The invention discloses a high-strength concrete prepared by applying cobbles, which belongs to the technical field of concrete, and comprises the following components in percentage by weight: harvesting under 600 Kg/m cement material 520, 140 Kg/m water 130, 760 Kg/m sand 660, 1060 Kg/m pebble stone 960 and admixture; the cementing material comprises 5-10% of fly ash, 8-20% of mineral powder, 5-10% of silica fume and the balance of cement; the additive accounts for 1.5-2.5% of the total amount of the cementing material. According to the invention, the cobble crushed and shaped cobble broken stone with particle size defects eliminated is used as the coarse aggregate, the content of flaky particles of the crushed and shaped cobble broken stone is small, the particle shape is good, the crushing value is less than 10%, the reasonable accumulation and stress distribution of aggregate in concrete are facilitated, the particle size distribution of the total material in high-strength concrete tends to be more reasonable, the working performance of concrete mixture and the strength of concrete are facilitated to be improved, the resource is saved, and the environment is protected.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to high-strength concrete prepared by applying cobbles.
Background
Concrete is a general name of composite materials formed by cementing coarse and fine aggregates into a whole by cementing materials, is called concrete for short, and is widely applied to various civil engineering such as buildings, roads, bridges and the like.
At present, with the vigorous development of the construction industry, the supply of the sand and stone materials is increasingly tense, and the cost is gradually increased. Traditional high-strength concrete, because the water-cement ratio is little, the cement quantity is big, and the water consumption is little, and is very high to stone particle gradation and particle shape requirement, and the particle size is too big and needle slice granule content is more, can directly influence concrete strength and concrete mix performance, and the lime stone rubble that the particle size is less that generally uses, and the exploitation of lime stone causes the resource to consume and environmental pollution to the cost is very high.
Disclosure of Invention
The invention aims to provide high-strength concrete prepared by using cobbles, and aims to solve the technical problems that aggregate limestone used for preparing the concrete in the prior art is high in mining cost and causes environmental pollution.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a high-strength concrete prepared by applying cobbles comprises the following components in percentage by weight: harvesting under 600 Kg/m cement material 520, 140 Kg/m water 130, 760 Kg/m sand 660, 1060 Kg/m pebble stone 960 and admixture;
the cementing material comprises 5-10% of fly ash, 8-20% of mineral powder, 5-10% of silica fume and the balance of cement;
the additive accounts for 1.5-2.5% of the total amount of the cementing material.
Preferably, the particle size of the pebble broken stone is 5-20mm, the crushing value is less than or equal to 10%, and the content of needle-shaped particles is less than 8%.
Preferably, the sand is river sand in a zone II with a fineness modulus of more than 2.6, the mud content is less than or equal to 2.0 percent, and the mud block content is less than or equal to 0.5 percent.
Preferably, the fly ash is F-class I fly ash in a power plant, the fineness is less than 12%, and the loss on ignition is less than 5%.
Preferably, the mineral powder is S95 grade mineral powder, the specific surface area is more than 400 square meters per Kg, and the activity index is more than 100 percent in 28 days.
Preferably, the cement is P.O42.5 or P.O52.5 cement, and the cement content is 450 Kg/m under cultivation conditions.
Preferably, the additive is a viscosity-reducing polycarboxylic acid high-performance water reducing agent with the water reducing rate of more than 35%.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: compared with the prior art, the cobble broken stone has the advantages that cobble broken stones with particle size defects eliminated through crushing and shaping are used as coarse aggregates, the needle-shaped particle content of the crushed and shaped cobble broken stones is small, the particle shape is good, the crushing value is less than 10%, reasonable accumulation and stress distribution of the aggregates in the concrete are facilitated, particle grading distribution of the overall materials in the high-strength concrete tends to be more reasonable, working performance of concrete mixtures and concrete strength are facilitated to be improved, resources are saved, and the environment is protected.
Detailed Description
The technical solutions in the embodiments are clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: the high-strength concrete prepared by applying cobbles comprises the following components in parts by weight (Kg/m) by weight: 450 cement, 719 sand, 1040 pebble broken stone, 130 water, 50 fly ash, 50 mineral powder, 50 silica fume and 12.0 admixture.
And mixing the components to obtain the high-strength concrete. Wherein the cement is ordinary portland cement, P.O42.5; broken pebble stones are crushed and shaped by river pebbles, the particle size of the broken pebble stones is 5-20mm, the crushing value index is less than or equal to 10 percent, and the content of needle-shaped particles is less than 8 percent; the sand is river sand in a zone II with the fineness modulus of more than 2.6, the mud content is less than or equal to 2.0 percent, and the mud block content is less than or equal to 0.5 percent; the additive is a viscosity-reducing polycarboxylic acid high-performance water reducing agent with the water reducing rate of more than 35 percent; the fly ash is class F I fly ash of a power plant, the fineness is less than 12 percent, and the ignition loss is less than 5 percent; the mineral powder is S95 grade mineral powder, the specific surface area is more than 400 square meters per Kg, and the activity index is more than 100 percent in 28 days; the silica fume is silica fume with specific surface area larger than 18000 square meters per Kg; the water is groundwater.
The concrete mixture obtained by mixing the components has the initial slump of 230mm, the expansion degree of 625mm, the slump time of 18s, no obvious loss of slump for 3 hours and good workability and workability, and the mixture is subjected to sample retention standard maintenance, the 7-day strength of the mixture is 95.3MPa, and the 28-day strength of the mixture is 107.8 MPa.
Example 2: the high-strength concrete prepared by applying cobbles comprises the following components in parts by weight (Kg/m) by weight: 400 cement, 719 sand, 1040 pebble broken stone, 130 water, 50 fly ash, 100 mineral powder, 50 silica fume and 12.0 admixture.
And mixing the components to obtain the high-strength concrete. Wherein the cement is ordinary portland cement, P.O42.5; broken pebble stones are crushed and shaped by river pebbles, the particle size of the broken pebble stones is 5-20mm, the crushing value index is less than or equal to 10 percent, and the content of needle-shaped particles is less than 8 percent; the sand is river sand in a zone II with the fineness modulus of more than 2.6, the mud content is less than or equal to 2.0 percent, and the mud block content is less than or equal to 0.5 percent; the additive is a viscosity-reducing polycarboxylic acid high-performance water reducing agent with the water reducing rate of more than 35 percent; the fly ash is class F I fly ash of a power plant, the fineness is less than 12 percent, and the ignition loss is less than 5 percent; the mineral powder is S95 grade mineral powder, the specific surface area is more than 400 square meters per Kg, and the activity index is more than 100 percent in 28 days; the silica fume is silica fume with specific surface area larger than 18000 square meters per Kg; the water is groundwater.
The obtained concrete mixture has initial slump of 235mm, slump of 635mm, slump time of 17s, no obvious loss of slump for 3.5 hours and good workability, and has the 7-day strength of 92.6MPa and the 28-day strength of 103.3MPa after sample retention standard curing.
In conclusion, the invention has the advantages of energy saving, environmental protection and high strength, the cobble which is crushed, shaped and eliminated and has particle size defects is adopted as the coarse aggregate, the cobble crushed stone has small content of flaky particles and better particle shape, the crushing value is less than 10%, the reasonable accumulation and stress distribution of the aggregate in the concrete are facilitated, the grading distribution of the total material particles in the high-strength concrete tends to be more reasonable, the working performance of the concrete mixture and the concrete strength are facilitated to be improved, and the purposes of saving resources and protecting the environment are realized.
In the description above, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and thus the present invention is not limited to the specific embodiments disclosed above.
Claims (7)
1. A high-strength concrete prepared by using cobbles is characterized by comprising the following components in percentage by weight: harvesting under 600 Kg/m cement material 520, 140 Kg/m water 130, 760 Kg/m sand 660, 1060 Kg/m pebble stone 960 and admixture;
the cementing material comprises 5-10% of fly ash, 8-20% of mineral powder, 5-10% of silica fume and the balance of cement;
the additive accounts for 1.5-2.5% of the total amount of the cementing material.
2. A high strength concrete prepared by using cobbles according to claim 1, wherein: the particle size of the pebble broken stone is 5-20mm, the crushing value is less than or equal to 10%, and the content of needle-shaped particles is less than 8%.
3. A high strength concrete prepared by using cobbles according to claim 1, wherein: the sand is river sand in a zone II with fineness modulus of more than 2.6, the mud content is less than or equal to 2.0 percent, and the mud block content is less than or equal to 0.5 percent.
4. A high strength concrete prepared by using cobbles according to claim 1, wherein: the fly ash is F class I fly ash of a power plant, the fineness is less than 12%, and the ignition loss is less than 5%.
5. A high strength concrete prepared by using cobbles according to claim 1, wherein: the mineral powder is S95 grade mineral powder, the specific surface area is more than 400 square meters per Kg, and the activity index is more than 100 percent in 28 days.
6. A high strength concrete prepared by using cobbles according to claim 1, wherein: the cement is P.O42.5 or P.O52.5 cement, and the cement content is 450 Kg/m through cultivation.
7. A high strength concrete prepared by using cobbles according to claim 1, wherein: the additive is a viscosity-reducing polycarboxylic acid high-performance water reducing agent with the water reducing rate of more than 35 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111632203.9A CN114180914A (en) | 2021-12-29 | 2021-12-29 | High-strength concrete prepared by applying cobbles |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111632203.9A CN114180914A (en) | 2021-12-29 | 2021-12-29 | High-strength concrete prepared by applying cobbles |
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| Publication Number | Publication Date |
|---|---|
| CN114180914A true CN114180914A (en) | 2022-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111632203.9A Pending CN114180914A (en) | 2021-12-29 | 2021-12-29 | High-strength concrete prepared by applying cobbles |
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| Country | Link |
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| CN (1) | CN114180914A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114685122A (en) * | 2022-05-10 | 2022-07-01 | 深圳市建业混凝土股份有限公司 | High-strength concrete |
| CN114716203A (en) * | 2022-03-25 | 2022-07-08 | 桐庐强基新型建材有限公司 | Concrete solid brick and preparation method thereof |
-
2021
- 2021-12-29 CN CN202111632203.9A patent/CN114180914A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 崔自治等: "C80卵石破碎石混凝土配合比设计研究", 《混凝土》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114716203A (en) * | 2022-03-25 | 2022-07-08 | 桐庐强基新型建材有限公司 | Concrete solid brick and preparation method thereof |
| CN114685122A (en) * | 2022-05-10 | 2022-07-01 | 深圳市建业混凝土股份有限公司 | High-strength concrete |
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Application publication date: 20220315 |
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