CN115594447A - Super high-rise pumping concrete and preparation method thereof - Google Patents
Super high-rise pumping concrete and preparation method thereof Download PDFInfo
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- CN115594447A CN115594447A CN202211182476.2A CN202211182476A CN115594447A CN 115594447 A CN115594447 A CN 115594447A CN 202211182476 A CN202211182476 A CN 202211182476A CN 115594447 A CN115594447 A CN 115594447A
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- 239000004567 concrete Substances 0.000 title claims abstract description 98
- 238000005086 pumping Methods 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 75
- 239000010881 fly ash Substances 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 39
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 28
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 28
- 239000004005 microsphere Substances 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 18
- 230000001050 lubricating effect Effects 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 4
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 21
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 15
- 230000000694 effects Effects 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 229910052582 BN Inorganic materials 0.000 claims description 5
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 14
- 239000000203 mixture Substances 0.000 description 13
- 230000000740 bleeding effect Effects 0.000 description 8
- 238000005204 segregation Methods 0.000 description 8
- 239000002253 acid Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000000518 rheometry Methods 0.000 description 3
- 239000011376 self-consolidating concrete Substances 0.000 description 3
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000012452 mother liquor Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000000176 sodium gluconate Substances 0.000 description 2
- 229940005574 sodium gluconate Drugs 0.000 description 2
- 235000012207 sodium gluconate Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007655 standard test method Methods 0.000 description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 206010016807 Fluid retention Diseases 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011325 microbead Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- -1 polydimethylsiloxane Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 238000012360 testing method 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
-
- 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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of concrete, and particularly discloses super high-rise pumping concrete and a preparation method thereof. The super high-rise pumping concrete comprises the following raw materials in parts by weight: 40-45 parts of cement, 80-100 parts of coarse aggregate, 60-70 parts of fine aggregate, 12-18 parts of water, 5-15 parts of lubricating material, 15-20 parts of fly ash, 2-5 parts of silica fume, 0.5-1 part of air entraining agent, 2-5 parts of fly ash hollow microsphere and 0.5-1 part of auxiliary agent; the auxiliary agent comprises a water reducing agent, a slump retaining agent and a retarder. The super high-rise pumping concrete prepared by the formula has excellent fluidity, does not segregate or weep in the pressurizing and pumping process, and has small loss with time.
Description
Technical Field
The application relates to the technical field of concrete, in particular to super high-rise pumping concrete and a preparation method thereof.
Background
With the rapid development of social economy and the continuous improvement of scientific and technical level, the population of modern cities is highly centralized, urban users are nervous in land and expensive in land price, and landmark buildings and super high-rise buildings are more and more popular in order to provide the use area to the maximum extent on limited land.
The construction difficulty is greatly increased while the building height is continuously increased, and in order to solve the problem of concrete conveying, a new concrete technology, namely a super high-rise concrete pumping technology, is provided by experts. By super high-rise pump concrete technology is generally meant modern pump concrete technology with pumping heights in excess of 200 m. The pipeline distribution line is complex and the number of elbows is increased along with the increase of the pumping height during pumping, so that the flowing resistance of concrete in a pipeline is greatly increased, the pumping pressure is continuously increased, and the pumping construction difficulty is increased due to the high strength and high viscosity of the concrete, so that higher requirements are provided for the construction performance of the concrete.
Disclosure of Invention
In order to improve the working performance, the application provides super high-rise pumping concrete and a preparation method thereof.
In a first aspect, the present application provides a super high-rise pumping concrete, which adopts the following technical scheme:
the super high-rise pump concrete comprises the following raw materials in parts by weight:
40-45 parts of cement, 80-100 parts of coarse aggregate, 60-70 parts of fine aggregate, 12-18 parts of water, 5-15 parts of lubricating material, 15-20 parts of fly ash, 2-5 parts of silica fume, 0.5-1 part of air entraining agent, 2-5 parts of fly ash hollow microsphere and 0.5-1 part of auxiliary agent;
the auxiliary agent comprises a water reducing agent, a slump retaining agent and a retarder.
By adopting the technical scheme, the components in the concrete system are matched with each other, and the super high-rise pumping concrete with good fluidity, no segregation and no bleeding can be prepared. The lubricating material in the system has good lubricity, and can enhance the fluidity of the mixture and improve the pumping performance of the mixture when being blended in concrete; the air entraining agent and the fly ash hollow microspheres are added, so that the fluidity of the mixture can be further improved, and the pumping performance of the concrete can be improved; the addition of the fly ash and the silica fume can enhance the coagulability and the water retention of the concrete, thereby reducing the segregation and bleeding of the concrete; the addition of water reducing agent, slump retaining agent, retarder and other assistants can not only enhance the flowability of concrete, but also solve the problems of segregation and bleeding of concrete and control the loss of slump over time.
Preferably, the lubricating material is selected from any one or more of graphite, molybdenum disulfide and boron nitride. Further preferably, the lubricating material is molybdenum disulfide.
By adopting the technical scheme, the lubricating material is selected from any one or more of graphite, molybdenum disulfide and boron nitride, and the fluidity of the concrete can be greatly improved. When the lubricating material is molybdenum disulfide, the concrete fluidity is improved, and the concrete loss with time can be reduced.
Preferably, the weight ratio of the molybdenum disulfide to the fly ash to the silica fume is (7-13): (16-18): (3-5); more preferably, the weight ratio of the molybdenum disulfide, the fly ash and the silica fume is 11.
By adopting the technical scheme, the coal ash and the silica fume can compensate for segregation and bleeding caused by a lubricant (molybdenum disulfide), so that segregation and bleeding of concrete are reduced. The concrete can ensure that the concrete is not isolated and does not bleed in the pressurizing and pumping process while having good fluidity.
Preferably, the activity index of the fly ash is 85% -95%, and the activity index of the silica fume is greater than or equal to 110%.
By adopting the technical scheme, the activity indexes of the fly ash and the silica fume are controlled, so that the viscosity and the quality of the concrete are favorably controlled, and the compressive strength of the concrete is improved.
In the application, the activity index refers to an activity index of 28 days, namely, the activity index of the fly ash in 28 days is 85% -95%, and the activity index of the silica fume in 28 days is more than or equal to 110%.
Preferably, the weight ratio of the air entraining agent to the fly ash cenospheres is (0.7-1): (2.5-3.8). More preferably, the weight ratio of the air entraining agent to the fly ash cenospheres is 0.75.
Based on the lubricating effect of the lubricating material on the concrete system, the system is further optimized through the air entraining agent and the fly ash hollow microspheres, so that the viscosity of the system can be reduced, the suspension characteristic of particles is kept, and the flowing of concrete is further enhanced; meanwhile, the relative humidity, the mechanical property and the carbonization resistance of the interior of the concrete can be improved. When the weight ratio of the air entraining agent to the fly ash cenospheres in the system is (0.7-1): (2.5-3.8), the viscosity of the concrete mixture is 40-80 pa.s, so that stable pumping under low viscosity is realized, namely, the concrete is prevented from segregation during low-viscosity pressure pumping.
In the application, the air entraining agent is alkyl arene sulfonate air entraining agent.
Preferably, the auxiliary agent further comprises a regulator and a rheological agent.
By adopting the technical scheme, the regulator is added into the system, so that the workability of concrete can be further improved; the rheological agent is added into the system, so that the sensitivity of the water reducing agent can be reduced, and the stability of the concrete mixture is enhanced.
Preferably, the auxiliary agent is a water reducing agent, a slump retaining agent, a retarder, a regulator and a rheological agent; and based on the total amount of the auxiliary agent, the water reducing agent is 5-10 parts, the slump retaining agent is 5-10 parts, the retarder is 3-5 parts, the regulator is 1-3 parts, and the rheological agent is 1-2 parts.
By adopting the technical scheme, the auxiliary agent is matched according to the formula of the self-compacting concrete, so that the working performance of the self-compacting concrete with large flow state and high strength can be adjusted, and the self-compacting concrete has excellent slump retaining property, segregation resistance and fluidity.
In the application, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the water reducing rate is 25-30%, and the pH value is 6-7.
The slump retaining agent is a polycarboxylic slump retaining agent or a naphthalene slump retaining agent.
The retarder is at least one selected from citric acid, tartaric acid and sodium gluconate.
The regulator is polycarboxylic acid water reducing mother liquor with solid content of 40-45%.
The rheology agent may be a silicone based rheology agent or an acrylic based rheology agent.
Preferably, the sand rate is 40-45%, and the loose bulk density of the coarse aggregate is 1530-1550kg/m 3 . More preferably, the coarse aggregate has a loose bulk density of 1540kg/m 3 。
The inventors found that the sand ratio was controlled to 40% to 45% and the loose bulk density of the coarse aggregate was 1530 to 1550kg/m 3 The strength and stability of the concrete can be effectively improved.
The loose packing density of the coarse aggregate can be controlled by controlling the particle size and the mixture ratio of the aggregate, and when the mass ratio of small crushed stones with the particle size of 5-10mm to large crushed stones with the particle size of 10-20mm is (3.7-4.5): (5-6) preparation ofWhen the mixture is used, the loose bulk density of the coarse aggregate is 1530-1550kg/m 3 。
In a second aspect, the present application provides a method for preparing super high-rise pump concrete, which adopts the following technical scheme:
the preparation method of the super high-rise pump concrete comprises the following steps:
and uniformly mixing the cement, the coarse aggregate, the fine aggregate, the water, the lubricating material, the fly ash, the silica fume, the air entraining agent, the fly ash hollow microspheres and the auxiliary agent to obtain the super high-rise pumping concrete.
In summary, the present application has the following beneficial effects:
the super high-rise pumping concrete prepared by the formula has excellent fluidity, does not segregate or weep in the pressurizing and pumping process, and has small loss with time.
Detailed Description
The present application will be described in further detail with reference to examples. Specifically, the following are provided: the following examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer; the starting materials used in the following examples are all those conventionally commercially available except where specifically noted.
Fly ash: the 28-day activity index is 90%;
silica fume: 28-day activity index 118%;
water reducing agent: the polycarboxylic acid high-efficiency water reducing agent has the water reducing rate of 27.8 percent and the pH value of 6.5;
slump retaining agent: a polycarboxylic slump retaining agent, in particular to a polycarboxylic high-performance slump retaining agent (SPS-100);
retarder: sodium gluconate;
rheological agent: silicone rheological agent, specifically polydimethylsiloxane;
and (3) a regulator: the solid content of the polycarboxylic acid water-reducing mother liquor is 42 percent.
Examples
Example 1
The super high-rise pumping concrete comprises the following steps:
uniformly mixing 40kg of cement, 80kg of coarse aggregate, 60kg of fine aggregate, 12kg of water, 15kg of graphite, 15kg of fly ash, 5kg of silica fume, 1kg of air entraining agent, 5kg of fly ash hollow microspheres and 0.5kg of auxiliary agent to obtain the super high-rise pumping concrete;
in this example, the loose bulk density of the coarse aggregate was 1520kg/m 3 ；
The auxiliary agent consists of 30% of water reducing agent, 50% of slump retaining agent and 20% of retarder.
Example 2
The super high-rise pumping concrete comprises the following steps:
uniformly mixing 45kg of cement, 100kg of coarse aggregate, 70kg of fine aggregate, 18kg of water, 5kg of graphite, 20kg of fly ash, 2kg of silica fume, 0.5kg of air entraining agent, 2kg of fly ash hollow microspheres and 1kg of auxiliary agent to obtain the super high-rise pumping concrete;
in this example, the loose bulk density of the coarse aggregate was 1520kg/m 3 ；
The auxiliary agent consists of 30% of water reducing agent, 50% of slump retaining agent and 20% of retarder.
Example 3
The super high-rise pumping concrete comprises the following steps:
uniformly mixing 42kg of cement, 90kg of coarse aggregate, 70kg of fine aggregate, 15kg of water, 11kg of graphite, 17kg of fly ash, 3kg of silica fume, 0.7kg of air entraining agent, 2.5kg of fly ash hollow microspheres and 0.8kg of auxiliary agent to obtain the super high-rise pump concrete;
in this example, the loose bulk density of the coarse aggregate was 1520kg/m 3 ；
The auxiliary agent consists of 30% of water reducing agent, 50% of slump retaining agent and 20% of retarder.
Example 4
The super high-rise pumping concrete comprises the following steps:
uniformly mixing 42kg of cement, 90kg of coarse aggregate, 70kg of fine aggregate, 15kg of water, 11kg of boron nitride, 17kg of fly ash, 3kg of silica fume, 0.7kg of air entraining agent, 2.5kg of fly ash hollow micro-beads and 0.8kg of auxiliary agent to obtain the super high-rise pump concrete;
in this example, the loose bulk density of the coarse aggregate was 1520kg/m 3 ；
The auxiliary agent consists of 30% of water reducing agent, 50% of slump retaining agent and 20% of retarder.
Example 5
The super high-rise pumping concrete comprises the following steps:
uniformly mixing 42kg of cement, 90kg of coarse aggregate, 70kg of fine aggregate, 15kg of water, 11kg of molybdenum disulfide, 17kg of fly ash, 3kg of silica fume, 0.7kg of air entraining agent, 2.5kg of fly ash hollow microspheres and 0.8kg of auxiliary agent to obtain super high-rise pump concrete;
in this example, the loose bulk density of the coarse aggregate was 1520kg/m 3 ；
The auxiliary agent consists of 30% of water reducing agent, 50% of slump retaining agent and 20% of retarder.
Example 6
The super high-rise pumping concrete comprises the following steps:
uniformly mixing 42kg of cement, 90kg of coarse aggregate, 70kg of fine aggregate, 15kg of water, 7kg of molybdenum disulfide, 18kg of fly ash, 5kg of silica fume, 0.7kg of air entraining agent, 2.5kg of fly ash hollow microspheres and 0.8kg of auxiliary agent to obtain the super high-rise pumping concrete;
in this example, the loose bulk density of the coarse aggregate was 1520kg/m 3 ；
The auxiliary agent consists of 30% of water reducing agent, 50% of slump retaining agent and 20% of retarder.
Example 7
The super high-rise pumping concrete comprises the following steps:
uniformly mixing 42kg of cement, 90kg of coarse aggregate, 70kg of fine aggregate, 15kg of water, 11kg of molybdenum disulfide, 17kg of fly ash, 3kg of silica fume, 1kg of air entraining agent, 3.8kg of fly ash hollow microspheres and 0.8kg of auxiliary agent to obtain the super high-rise pumping concrete;
in this example, the loose bulk density of the coarse aggregate was 1520kg/m 3 ；
The auxiliary agent consists of 30% of water reducing agent, 50% of slump retaining agent and 20% of retarder.
Example 8
The super high-rise pumping concrete comprises the following steps:
42kg of cement, 90kg of coarse aggregate, 70kg of fine aggregate, 15kg of water, 11kg of molybdenum disulfide, 17kg of fly ash, 3kg of silica fume, 0.75kg of air entraining agent, 3.2kg of fly ash hollow microsphere and 0.8kg of auxiliary agentUniformly mixing to obtain super high-rise pumping concrete; in this example, the loose bulk density of the coarse aggregate was 1520kg/m 3 ；
The auxiliary agent consists of 30% of water reducing agent, 50% of slump retaining agent and 20% of retarder.
Example 9
The super high-rise pumping concrete comprises the following steps:
uniformly mixing 42kg of cement, 90kg of coarse aggregate, 70kg of fine aggregate, 15kg of water, 11kg of molybdenum disulfide, 17kg of fly ash, 3kg of silica fume, 0.75kg of air entraining agent, 3.2kg of fly ash hollow microspheres and 0.8kg of auxiliary agent to obtain the super high-rise pumping concrete; in this example, the loose bulk density of the coarse aggregate was 1520kg/m 3 ；
The auxiliary agent consists of 20% of water reducing agent, 40% of slump retaining agent, 20% of retarder, 10% of regulator and 10% of rheological agent.
Example 10
The super high-rise pumping concrete comprises the following steps:
uniformly mixing 42kg of cement, 90kg of coarse aggregate, 70kg of fine aggregate, 15kg of water, 11kg of molybdenum disulfide, 17kg of fly ash, 3kg of silica fume, 0.75kg of air entraining agent, 3.2kg of fly ash hollow microspheres and 0.8kg of auxiliary agent to obtain super high-rise pump concrete; in this example, the loose bulk density of the coarse aggregate was 1520kg/m 3 ；
The auxiliary agent consists of 50% of water reducing agent, 30% of slump retaining agent, 10% of retarder, 5% of regulator and 5% of rheological agent.
Example 11
The super high-rise pumping concrete comprises the following steps:
uniformly mixing 42kg of cement, 90kg of coarse aggregate, 70kg of fine aggregate, 15kg of water, 11kg of molybdenum disulfide, 17kg of fly ash, 3kg of silica fume, 0.75kg of air entraining agent, 3.2kg of fly ash hollow microspheres and 0.8kg of auxiliary agent to obtain the super high-rise pumping concrete; in this example, the loose bulk density of the coarse aggregate was 1520kg/m 3 ；
The auxiliary agent consists of 35% of water reducing agent, 40% of slump retaining agent, 10% of retarder, 8% of regulator and 7% of rheological agent.
Example 12
The super high-rise pumping concrete comprises the following steps:
uniformly mixing 42kg of cement, 90kg of coarse aggregate, 70kg of fine aggregate, 15kg of water, 11kg of molybdenum disulfide, 17kg of fly ash, 3kg of silica fume, 0.75kg of air entraining agent, 3.2kg of fly ash hollow microspheres and 0.8kg of auxiliary agent to obtain super high-rise pump concrete; in this example, the loose bulk density of the coarse aggregate was 1540kg/m 3 ；
The auxiliary agent consists of 35% of water reducing agent, 40% of slump retaining agent, 10% of retarder, 8% of regulator and 7% of rheological agent.
Example 13
The super high-rise pumping concrete comprises the following steps:
uniformly mixing 42kg of cement, 90kg of coarse aggregate, 70kg of fine aggregate, 15kg of water, 11kg of molybdenum disulfide, 17kg of fly ash, 3kg of silica fume, 0.75kg of air entraining agent, 3.2kg of fly ash hollow microspheres and 0.8kg of auxiliary agent to obtain the super high-rise pumping concrete; in this example, the loose bulk density of the coarse aggregate was 1530kg/m 3 ；
The auxiliary agent consists of 35% of water reducing agent, 40% of slump retaining agent, 10% of retarder, 8% of regulator and 7% of rheological agent.
Comparative example
Comparative example 1
Comparative example 1 differs from example 4 only in that in comparative example 1, no lubricant (molybdenum disulfide) was added, and the remainder remained the same as in example 4.
Comparative example 2
Comparative example 1 differs from example 8 only in that in comparative example 2, no air entraining agent and no fly ash cenospheres were added, and the remainder remained the same as in example 4.
Comparative example 3
Comparative example 3 differs from example 8 only in that in comparative example 3 the adjuvant consists of 70% water reducing agent and 30% retarder.
Performance test
The performance of the ultra-high layer pumping concrete prepared in examples 1 to 13 and comparative examples 1 to 4 was measured, and specific measurement data are shown in table 1 below.
Measuring the slump and the expansion of each sample according to the standard in GB/T50080 Standard test method for the Performance of common concrete mixtures; after detecting the initial slump and the initial expansion degree, quickly filling the mixture into a clean barrel, sealing the barrel by using plastic cloth, pouring out the concrete mixture after standing for 30min, turning over the concrete mixture for several times by using an iron shovel soaked in advance, and then measuring the slump and the expansion degree at the time of 30 min; after the completion of the preparation, all the mixture is filled into a barrel, sealed and placed for 30min, and the same method is adopted for one more operation, so that the slump and the expansion degree in 60min are obtained;
detecting the 28-day compressive strength of each sample according to a compressive strength test in GB/T50081-2002 Standard test methods for mechanical properties of common concrete;
and detecting the pressure bleeding rate of each sample by using a pressure bleeding instrument.
TABLE 1
It can be seen from the combination of examples 1-3 and from Table 1 that the concrete obtained according to the formulation of the present application has good fluidity and compressive strength.
Combining examples 3-5 and comparative example 1 with table 1, it can be seen that the addition of a lubricating material to the concrete system improves the fluidity of the concrete, preferably, the lubricating material is selected to be molybdenum disulfide, which results in less loss of concrete over time and better flow properties than graphite and boron nitride.
It can be seen from the combination of examples 5, 7-8 and comparative example 2 and table 1 that the addition of the air entraining agent and the fly ash cenospheres can reduce the segregation and bleeding of the concrete and improve the mechanical properties of the concrete, and particularly, the weight ratio of the air entraining agent to the fly ash cenospheres is 0.75.
It can be seen by combining examples 8-1 and comparative example 3 and table 1 that the selection and proportion of the additives affect the performance of the concrete, and the additives composed of 20% -50% of the water reducing agent, 30% -40% of the slump retaining agent, 10% -20% of the retarder, 5% -10% of the regulator and 5% -10% of the rheological agent can improve the working performance and mechanical performance of the concrete, especially when the water reducing agent accounts for 35%, the slump retaining agent accounts for 40%, the retarder accounts for 10%, the regulator accounts for 8% and the rheological agent accounts for 7%, the working performance and mechanical performance of the concrete are optimal.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The super high-rise pump concrete is characterized in that: the feed comprises the following raw materials in parts by weight:
40-45 parts of cement, 80-100 parts of coarse aggregate, 60-70 parts of fine aggregate, 12-18 parts of water, 5-15 parts of lubricating material, 15-20 parts of fly ash, 2-5 parts of silica fume, 0.5-1 part of air entraining agent, 2-5 parts of fly ash hollow microsphere and 0.5-1 part of auxiliary agent;
the auxiliary agent comprises a water reducing agent, a slump retaining agent and a retarder.
2. The ultra-high pumping concrete according to claim 1, wherein: the lubricating material is selected from any one or more of graphite, molybdenum disulfide and boron nitride.
3. The ultra-high pumping concrete according to claim 2, wherein: the lubricating material is molybdenum disulfide.
4. The ultra-high pumping concrete according to claim 3, wherein: the weight ratio of the molybdenum disulfide to the fly ash to the silica fume is (7-13): (16-18): (3-5).
5. The ultra-high pumping concrete according to claim 4, wherein: the activity index of the fly ash is 85-95%, and the activity index of the silica fume is greater than or equal to 110%.
6. The ultra-high pumping concrete according to any one of claims 1 to 5, wherein: the weight ratio of the air entraining agent to the fly ash hollow microsphere is (0.7-1): (2.5-3.8).
7. The ultra-high pumping concrete according to claim 1, wherein: the auxiliary agent also comprises a regulator and a rheological agent.
8. The ultra-high pumping concrete according to claim 1, wherein: the auxiliary agent is prepared from the following raw materials in percentage by weight:
20-50% of water reducing agent, 30-40% of slump retaining agent, 10-20% of retarder, 5-10% of regulator and 5-10% of rheological agent.
9. The ultra-high pumping concrete according to claim 1, wherein: the sand rate is 40-45%, and the loose bulk density of the coarse aggregate is 1530-1550kg/m 3 。
10. The method for preparing ultra-high pumping concrete according to any one of claims 1 to 9, wherein: the method comprises the following steps:
and uniformly mixing the cement, the coarse aggregate, the fine aggregate, the water, the lubricating material, the fly ash, the silica fume, the air entraining agent, the fly ash hollow microspheres and the auxiliary agent to obtain the super high-rise pumping concrete.
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Application publication date: 20230113 |