CN108840630B - High-performance concrete - Google Patents
High-performance concrete Download PDFInfo
- Publication number
- CN108840630B CN108840630B CN201810901295.8A CN201810901295A CN108840630B CN 108840630 B CN108840630 B CN 108840630B CN 201810901295 A CN201810901295 A CN 201810901295A CN 108840630 B CN108840630 B CN 108840630B
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- China
- Prior art keywords
- cement
- silica fume
- fly ash
- water
- less
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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
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides a high-performance concrete which is prepared from kg/m3The meter, including: 520-560 of cementing material, 160-170 of water, 650-750 of sand and 950-1050 of stoneA seed; wherein the cementing material comprises 15-20% of fly ash, 25-35% of mineral powder, 2-12% of silica fume and the balance of cement; further comprising: and the additive accounts for 1.0-1.2% of the total amount of the cementing material, and is selected from ether polycarboxylic acid water reducing agents. By adding the ether polycarboxylic acid water reducing agent and the silica fume, the cement using amount and the total amount of the admixture are greatly reduced, and the obtained concrete has good strength and fluidity, good durability, and higher workability and volume stability.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to high-performance concrete.
Background
Concrete is a general term for engineering composite materials in which aggregate is cemented into a whole by a cementing material, and is widely used in civil engineering.
At present, when the concrete with high fluidity and high performance above C80 is prepared, the water-cement ratio is low, the cement consumption is high, the water consumption is low, the cohesiveness of the obtained concrete is high, certain difficulty is brought to construction and pumping, the water consumption is required to be increased for reducing the viscosity, and the total amount of the admixture has to be increased for ensuring the same water-cement ratio. Due to the large cement consumption, the unilateral cost of the concrete is increased, and the adverse phenomena of large concrete shrinkage, overhigh hydration heat, easy cracking and the like are caused.
Disclosure of Invention
In view of the above, the present invention aims to provide a high performance concrete with low admixture consumption, good pumping performance and high strength.
The invention provides a high-performance concrete which is prepared from kg/m3The meter, including: 520-560 of a cementing material, 160-170 of water, 650-750 of sand and 950-1050 of stones;
wherein the cementing material comprises 15-20% of fly ash, 25-35% of mineral powder, 2-12% of silica fume and the balance of cement;
further comprising: and the additive accounts for 1.0-1.2% of the total amount of the cementing material, and is selected from ether polycarboxylic acid water reducing agents.
The ether polycarboxylic acid admixture is added on the basis of the traditional high-performance concrete, 8-12% of silica fume is added into the cementing material, and the silica fume can be relatively filledThe pore space of the cement particle is large, the volume of the pore space is reduced, the concrete is more compact, and the long-time property of the concrete is greatly improved. After the silica fume is added into concrete, the small particles are quickly dissolved when meeting water, and the SiO in the solution2And the gel poor in Ca forms an adhesion layer on the surface of the silicon powder particles, and finally Ca (OH) generated by cement hydration is generated, so that C-S-H gel is generated, and the strength of the concrete is greatly improved. In addition, the ether admixture has the advantages of good diffusivity and low gas content, so that the obtained concrete has high fluidity. Experimental results show that the concrete provided by the invention has good fluidity and strength.
In one embodiment, the cement is selected from grade p.o42.5 and/or p.o52.5 cements.
In one embodiment, the cement is used in kg/m3The number of the grooves is 200-300.
In one embodiment, the fly ash is selected from power plant class F class I fly ash with a loss on ignition of less than 5%.
In one embodiment, the ore dust is selected from S105 grade ore dust with a specific surface area greater than 550m2/kg。
In one embodiment, the silica fume has a specific surface area greater than 20000m2/kg。
In one embodiment, the sand is selected from river sand in the area II, the fineness modulus is more than 2.6, the mud content is less than or equal to 2.0, and the cement block content is less than or equal to 1.0.
In one embodiment, the crushed stone has a particle size of 5-31.5 mm and a crushing value of less than or equal to 10%.
In one embodiment, the ether polycarboxylate superplasticizer has a water reduction rate of greater than 35%.
The invention provides a concrete, which is prepared from the following components in kg/m3The meter, including:
270 of cement;
688 grit;
1032 stone;
160 of water;
78 fly ash;
130 of mineral powder;
42 of silica fume;
5.7 of the admixture.
The other concrete provided by the invention is in kg/m3The meter, including:
207 of cement;
718 of sand;
992 stones;
170 of water;
112 fly ash;
196 powdered ore;
45 of silica fume;
6.2 of the admixture.
By adding the ether polycarboxylic acid water reducing agent and the silica fume, the cement using amount and the total amount of the admixture are greatly reduced, and the obtained concrete has good strength and fluidity, good durability, and higher workability and volume stability.
Detailed Description
Example 1
Proportioning:
cement: sand: stone: water: fly ash: mineral powder: silica fume: admixture 270:688:1032:160:78:130:42:5.7 (kg/m)3)；
Mixing cement, sand, stones, water, fly ash, mineral powder, silica fume and an additive to obtain concrete; wherein the cement is ordinary portland cement, P.O42.5; the fly ash is F class I fly ash of a power plant, and the ignition loss is less than 5%; the mineral powder is S105 grade mineral powder, and the specific surface area is more than 550m2Per kg; the silica fume has a specific surface area of more than 20000m2(ii) silica fume per kg; river sand in the area II is adopted as the sand, the fineness modulus is more than 2.6, the mud content is less than or equal to 2.0, and the cement block content is less than or equal to 1.0; the particle size of the crushed stone is 5-31.5 mm, and the crushing value is less than or equal to 10 percent; the water reducing agent is an ether polycarboxylic acid water reducing agent, and the water reducing rate is more than 35 percent; the water is groundwater.
The obtained concrete has no obvious loss after 3.5 hours at the temperature of 30 ℃, and has good pumping performance, the cylinder pouring time is less than 20S, the slump is 240mm, the expansion degree is 620mm, the 3-day strength is 32.0MPa, the 7-day strength is 54.4MPa, the 28-day strength is 86.0MPa, and the 60-day strength is 102.3 MPa.
Example 2
Proportioning:
cement: sand: stone: water: fly ash: mineral powder: silica fume: additive 207:718:992:170:112:196: 45: 6.2 (kg/m)3)；
Mixing cement, sand, stones, water, fly ash, mineral powder, silica fume and an additive to obtain concrete; wherein the cement is ordinary portland cement, P.O42.5; the fly ash is F class I fly ash of a power plant, and the ignition loss is less than 5%; the mineral powder is S105 grade mineral powder, and the specific surface area is more than 550m2Per kg; the silica fume has a specific surface area of more than 20000m2(ii) silica fume per kg; river sand in the area II is adopted as the sand, the fineness modulus is more than 2.6, the mud content is less than or equal to 2.0, and the cement block content is less than or equal to 1.0; the particle size of the crushed stone is 5-31.5 mm, and the crushing value is less than or equal to 10 percent; the water reducing agent is an ether polycarboxylic acid water reducing agent, and the water reducing rate is more than 35 percent; the water is groundwater.
The obtained concrete has no obvious loss after 4 hours at the temperature of 30 ℃, and has good pumping performance, the cylinder inverting time is 18S, the slump is 245mm, the expansion degree is 600mm, the 3-day strength is 28.0MPa, the 7-day strength is 48.6MPa, the 28-day strength is 80.0MPa, and the 60-day strength is 92.5 MPa.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (1)
1. High-performance concrete in kg/m3The formula is characterized by comprising the following raw materials in parts by weight: cement: sand: stone: water: fly ash: mineral powder: silica fume: the admixture is 270:688:1032:160:78:130:42: 5.7;
mixing cement, sand, stones, water, fly ash, mineral powder, silica fume and an additive to obtain concrete; wherein the cement is ordinary portland cement, P.O42.5; the fly ash is F class I fly ash of a power plant, and the ignition loss is less than 5%; the mineral powder is S105 grade mineral powder, and the specific surface area is more than 550m2Per kg; the silica fume has a specific surface area of more than 20000m2(ii) silica fume per kg; zone II for sandRiver sand with fineness modulus of more than 2.6, mud content of less than or equal to 2.0 and cement block content of less than or equal to 1.0; the particle size of the crushed stone is 5-31.5 mm, and the crushing value is less than or equal to 10 percent; the water reducing agent is an ether polycarboxylic acid water reducing agent, and the water reducing rate is more than 35 percent; the water is groundwater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810901295.8A CN108840630B (en) | 2018-08-09 | 2018-08-09 | High-performance concrete |
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|---|---|---|---|
| CN201810901295.8A CN108840630B (en) | 2018-08-09 | 2018-08-09 | High-performance concrete |
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| CN108840630A CN108840630A (en) | 2018-11-20 |
| CN108840630B true CN108840630B (en) | 2020-12-11 |
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| CN201810901295.8A Active CN108840630B (en) | 2018-08-09 | 2018-08-09 | High-performance concrete |
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| CN110002820A (en) * | 2019-04-16 | 2019-07-12 | 郑州鑫基商品混凝土有限公司 | A kind of high performance concrete and preparation method thereof |
| CN114427180A (en) * | 2020-10-29 | 2022-05-03 | 四川国兴腾隆科技有限公司 | Sleeper repairing process |
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| PT2651846T (en) * | 2010-12-17 | 2020-03-05 | Univ America Catholic | Geopolymer composite for ultra high performance concrete |
| CN102503262A (en) * | 2011-10-19 | 2012-06-20 | 合肥天柱包河特种混凝土有限公司 | Self-compacting concrete and design method of mixing proportion thereof |
| CN103708781A (en) * | 2013-12-20 | 2014-04-09 | 亚泰集团沈阳建材有限公司 | Low-chloride ion high-performance concrete |
| CN105503059A (en) * | 2015-12-11 | 2016-04-20 | 宁夏盛远新型建材有限责任公司 | High performance concrete |
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