CN110746159A - Anti-crack pumping concrete and preparation method and pumping method thereof - Google Patents
Anti-crack pumping concrete and preparation method and pumping method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 115
- 238000005086 pumping Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000010881 fly ash Substances 0.000 claims abstract description 42
- 239000000463 material Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000843 powder Substances 0.000 claims abstract description 34
- 239000004568 cement Substances 0.000 claims abstract description 33
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 32
- 239000011707 mineral Substances 0.000 claims abstract description 32
- 239000004743 Polypropylene Substances 0.000 claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 23
- -1 polypropylene Polymers 0.000 claims abstract description 23
- 229920001155 polypropylene Polymers 0.000 claims abstract description 23
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000002253 acid Substances 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 15
- 239000003292 glue Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims description 16
- 238000005336 cracking Methods 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
- 239000011863 silicon-based powder Substances 0.000 claims description 13
- 239000011398 Portland cement Substances 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 5
- 239000011083 cement mortar Substances 0.000 claims description 4
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 238000009435 building construction Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 15
- 239000011372 high-strength concrete Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 239000008030 superplasticizer Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000004574 high-performance concrete Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 239000011376 self-consolidating concrete Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
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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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
-
- 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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses anti-crack pumping concrete and a preparation method and a pumping method thereof, and belongs to the field of concrete preparation. The anti-crack pumping concrete is characterized by comprising the following raw materials in parts by weight: 420 parts of cement 380, 1210 parts of coarse aggregate 1050, 675 parts of fine aggregate 630, 58-72 parts of fly ash, 40-78 parts of S95-grade mineral powder, 45-60 parts of silica fume, 0.8-5 parts of polypropylene fiber, 12.5-15.1 parts of polycarboxylic acid water reducer and 136 parts of water 128; controlling the water-cement ratio to be 0.28-0.34; the water-glue ratio is controlled to be 0.23-0.27; the fly ash accounts for 10 to 13 percent of the total amount of all the cementing materials; the mineral powder accounts for 7-14% of the total amount of all the cementing materials; the silica fume accounts for 7-11% of the total amount of all the cementing materials; the ratio of the fly ash to the mineral powder is controlled to be 1.2-1.68; the sand rate is controlled to be 0.3-0.39. The anti-crack pumping concrete has high strength and can meet the pumping requirement in 100m super high-rise building construction.
Description
Technical Field
The invention discloses anti-crack pumping concrete and a preparation method and a pumping method thereof, and belongs to the field of concrete preparation.
Background
With the urbanization entering a new development stage, more and more enterprises choose to build super high-rise buildings as headquarters of the enterprises and commercial complexes, the market scale of the super high-rise buildings is remarkably enlarged in recent years, and the demand for high-strength and high-performance concrete is continuously increased. On one hand, the high-strength concrete is required to have high strength and good working performance, on the other hand, high-rise pumping can be realized through a pumping machine, and meanwhile, the high-strength concrete is not cracked after being cured and formed, and the forming effect is good.
Common concrete is still the most widely used building material in the field of building at present, but with the environmental protection supervision becoming tight year by year, the supply of sandstone raw materials is short, and the quality of the raw materials fluctuates, so that the strength and durability of the common concrete are insufficient. Currently, economic and social development enters a high-quality development stage, and the engineering construction quality and quality increasingly become the embodiment of enterprise competitiveness, economic benefit and social benefit.
Patent publication No. CN108218322A discloses a concrete in the form of C80 high-throwing vibration-free self-compacting concrete and its construction process. Although the concrete has high strength, when the concrete is pumped in a high-rise layer, the concrete has the problems of high pumping viscosity, easy pipe blockage and cracking after forming.
Patent publication No. CN107777961A, high strength self-compacting concrete for easy super high-rise pumping, discloses a high strength pumping concrete, comprising the following components in parts by weight: 144 parts of water 127-containing material, 330 parts of cement 230-containing material, 36-60 parts of fly ash, 45-70 parts of mineral powder, 70-100 parts of silica powder, 890 parts of coarse aggregate 860-containing material, 630 parts of fine aggregate 490-containing material, 6-10 parts of air-entraining polycarboxylic acid water reducing agent and 2-3 parts of air-entraining agent. Although the concrete can realize high-rise pumping, the strength of the concrete is low, when the concrete is used for a super high-rise building, the section of a member is large, the internal space pattern of the building is limited, meanwhile, the durability of the concrete is poor, and in addition, when the concrete is used for a large-volume concrete structure, more safeguarding measures need to be taken in the construction process to avoid or lighten concrete cracks, and the process control is more difficult.
Because the higher the concrete strength is, the larger the pumping difficulty is, the development of the high-performance concrete with the characteristics of high strength, high workability, small drying shrinkage, difficult cracking, easy high-rise pumping construction and the like is a technical problem which is urgently needed to be solved in the field of super high-rise building construction. Compared with common concrete, the high-strength and high-performance concrete can obviously reduce the consumption of concrete materials, save resources and energy sources under the condition of ensuring the safety of a building structure, can reduce the sectional area of structural members, increases the indoor available space of a building and has huge market demand.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide concrete with high strength and good pumping performance.
The anti-crack pump concrete is composed of the following raw materials in parts by weight: 420 parts of cement 380, 1210 parts of coarse aggregate 1050, 675 parts of fine aggregate 630, 58-72 parts of fly ash, 40-78 parts of S95-grade mineral powder, 45-60 parts of silica fume, 0.8-5 parts of polypropylene fiber, 12.5-15.1 parts of polycarboxylic acid water reducer and 136 parts of water 128; wherein the water-cement ratio is controlled to be 0.28-0.34; the water-glue ratio is controlled to be 0.23-0.27; the fly ash accounts for 10 to 13 percent of the total amount of all the cementing materials; the mineral powder accounts for 7-14% of the total amount of all the cementing materials; the silica fume accounts for 7-11% of the total amount of all the cementing materials; the ratio of the fly ash to the mineral powder is controlled to be 1.2-1.68; the sand rate is controlled to be 0.3-0.39.
Preferably, the mass fraction of the polypropylene fiber in the concrete is 0.03-0.19%.
Preferably, the cement strength grade is 52.5 portland cement; the coarse aggregate is crushed stone with the thickness of 5-20 mm; the fine aggregate is medium sand with fineness modulus of 2.6-3.0, and the mud content is less than 2%; the fly ash is I-grade fly ash.
Preferably, the anti-crack pumping concrete consists of the following components: 410 parts of cement 385-containing material, 1111-5 parts of coarse aggregate, 1185 parts of 652-containing fine aggregate, 672 parts of fly ash, 40-55 parts of S95-grade mineral powder, 40-50 parts of silica fume, 0.9-1.1 parts of polypropylene fiber, 12.5-15 parts of polycarboxylic acid water reducing agent and 135 parts of water 130-containing material; wherein the water-cement ratio is controlled to be 0.33-0.44; the water-glue ratio is controlled to be 0.23-0.24; the fly ash accounts for 11-12% of the total amount of all the cementing materials; the mineral powder accounts for 7-10% of the total amount of all the cementing materials; the silica fume accounts for 7-9% of the total amount of all the cementing materials; the ratio of the fly ash to the mineral powder is controlled to be 1.2-1.68; the sand rate is controlled to be 0.36-0.37.
Preferably, the anti-crack pumping concrete consists of the following components: 410 parts of cement, 1185 parts of coarse aggregate, 672 parts of fine aggregate, 67 parts of fly ash, 40 parts of S95-grade mineral powder, 40 parts of silica fume, 0.9 part of polypropylene fiber, 15 parts of polycarboxylic acid water reducing agent and 135 parts of water.
Preferably, the polycarboxylate superplasticizer is a cika-3300 type superplasticizer; the micro silicon powder is donulanxing-EBS type silicon powder.
Preferably, the compressive strength of the anti-cracking pumping concrete at 28d is more than or equal to 79 MPa; more preferably, the compressive strength of the anti-cracking pumping concrete at 28d is more than or equal to 82 MPa.
The second technical problem to be solved by the invention is to provide a preparation method of high-strength anti-crack pumping concrete.
A preparation method of high-strength anti-crack pumping concrete comprises the following steps:
(1) uniformly mixing the coarse aggregate, the fine aggregate, the fly ash, the S95-grade mineral powder, the micro silicon powder and the cement to obtain a premix;
(2) and adding water and the polycarboxylic acid water reducing agent into the premix, uniformly mixing, adding the polypropylene fiber, and uniformly mixing to obtain the high-strength anti-crack pumping concrete.
The invention also provides a pumping method of the high-strength anti-cracking pump concrete.
The pumping method comprises the following steps:
(1) a test pump test was first performed to verify the pumping height of the concrete.
Firstly, erecting pump pipes on a test site, cumulatively arranging 10 right-angle joints, arranging 8 right-angle joints in the horizontal direction and 2 right-angle joints in the vertical direction, wherein the total length of the pump pipes exceeds 100m, the horizontal direction is 90 m, the vertical direction is 20m, and the vertical pumping height is converted into 120m according to JGJ/T10-2011 concrete pumping construction technical rules;
(2) before pumping construction, cement mortar with the mixing ratio consistent with that of the high-strength anti-cracking pumping concrete is used for lubricating a pipeline, then the high-strength anti-cracking pumping concrete is transferred into a ground pump, and the concrete is pumped through the ground pump.
The invention has the beneficial effects that:
1. the high-strength anti-cracking pump concrete has the advantages of easy selection of raw materials and wide source.
2. The high-strength anti-cracking pump concrete has excellent slump, expansion, workability and compressive strength, and meanwhile, the concrete mixture has the characteristic of self-compaction, so that the durability of the C70 concrete is improved, and cracks of a concrete structure are effectively reduced.
3. The high-strength anti-crack pumping concrete can meet the pumping requirement in 100m super high-rise building construction.
4. The high-strength anti-cracking pump concrete can be used for a large-volume concrete column structure, is good in forming effect, and has the effect of fair-faced concrete after being formed.
Drawings
FIG. 1 shows the high strength concrete pumping construction molding effect, and the left drawing shows a large-section rectangular concrete structural column; the right drawing is a circular column concrete structure column.
Detailed Description
The first technical problem to be solved by the invention is to provide concrete with high strength and good pumping performance.
The anti-crack pump concrete is composed of the following raw materials in parts by weight: 420 parts of cement 380, 1210 parts of coarse aggregate 1050, 675 parts of fine aggregate 630, 58-72 parts of fly ash, 40-78 parts of S95-grade mineral powder, 45-60 parts of silica fume, 0.8-5 parts of polypropylene fiber, 12.5-15.1 parts of polycarboxylic acid water reducer and 136 parts of water 128; wherein the water-cement ratio is controlled to be 0.28-0.34; the water-glue ratio is controlled to be 0.23-0.27; the fly ash accounts for 10 to 13 percent of the total amount of all the cementing materials; the mineral powder accounts for 7-14% of the total amount of all the cementing materials; the silica fume accounts for 7-11% of the total amount of all the cementing materials; the ratio of the fly ash to the mineral powder is controlled to be 1.2-1.68; the sand rate is controlled to be 0.3-0.39.
The cementing material comprises cement, fly ash, S95-grade mineral powder and micro silicon powder.
The water-cement ratio is the weight of water/the weight of cement; water-to-gel ratio (weight of water/total weight of cementitious material); the sand rate is the amount of sand/(the amount of sand + the amount of stones);
the invention needs to strictly control several key factors of water-cement ratio, water-glue ratio, the percentage of fly ash to the total amount of all cementing materials, the percentage of mineral powder to the total amount of all cementing materials, the percentage of silica fume to the total amount of all cementing materials, the ratio of fly ash to mineral powder and sand rate. If any of the parameters of the prepared concrete is not within the above-mentioned range, the strength and pumping performance of the prepared concrete are affected.
When the water cement ratio is more than 0.34, the strength of the prepared concrete is reduced, and the concrete can bleed and is easy to block pipes when being pumped; when the water cement ratio is less than 0.28, the strength of the prepared concrete is reduced, and when pumping is performed, pumping resistance is increased, and pipe blockage occurs.
When the water-cement ratio is more than 0.27, the strength of the prepared concrete is reduced, and the concrete can bleed and is easy to block pipes when being pumped; when the water-cement ratio is less than 0.23, the strength of the prepared concrete is reduced, and when the concrete is pumped, the pumping resistance is increased, so that pipe blockage is easy to occur.
When the coal ash accounts for more than 0.13 percent of the total amount of all the cementing materials, the prepared concrete has increased viscosity, poor fluidity and easy pipe blockage; when the percentage of the fly ash in the total amount of all the cementing materials is less than 0.10, the workability of the prepared concrete is reduced, and the strength is reduced.
When the micro silicon powder accounts for more than 0.11 percent of the total amount of all the cementing materials, the viscosity of the prepared concrete is increased, and pipes are easy to block; when the percentage of the micro silicon powder in the total amount of all the cementing materials is less than 0.07, the strength of the prepared concrete is reduced.
The polypropylene fiber is added in the concrete, and aims to improve the mechanical property of the concrete, improve the crack resistance of a structural member poured by the concrete and prevent the concrete from generating cracks.
Preferably, the mass fraction of the polypropylene fiber in the concrete is 0.03-0.19%. The added polypropylene fiber needs to be controlled within a certain range, and the mass fraction of the polypropylene fiber in the concrete is 0.03-0.19%. If the addition amount of the polypropylene fiber is less than 0.03%, the process control during construction is difficult and temperature cracks are easy to generate when the obtained concrete is used for pouring a large-section structural member. If the addition amount of the polypropylene fiber is more than 0.19 percent, the fluidity of concrete is reduced, and the pumping construction performance is reduced.
Preferably, the cement strength grade is 52.5 portland cement; the coarse aggregate is crushed stone with the thickness of 5-20 mm; the fine aggregate is medium sand with fineness modulus of 2.6-3.0, and the mud content is less than 2%; the fly ash is I-grade fly ash.
Preferably, in order to further improve the performance of the concrete, the anti-crack pumping concrete consists of the following components: 410 parts of cement 385-containing material, 1111-5 parts of coarse aggregate, 1185 parts of 652-containing fine aggregate, 672 parts of fly ash, 40-55 parts of S95-grade mineral powder, 40-50 parts of silica fume, 0.9-1.1 parts of polypropylene fiber, 12.5-15 parts of polycarboxylic acid water reducing agent and 135 parts of water 130-containing material; wherein the water-cement ratio is controlled to be 0.33-0.44; the water-glue ratio is controlled to be 0.23-0.24; the fly ash accounts for 11-12% of the total amount of all the cementing materials; the mineral powder accounts for 7-10% of the total amount of all the cementing materials; the silica fume accounts for 7-9% of the total amount of all the cementing materials; the ratio of the fly ash to the mineral powder is controlled to be 1.2-1.68; the sand rate is controlled to be 0.36-0.37.
Preferably, the anti-crack pumping concrete consists of the following components: 410 parts of cement, 1185 parts of coarse aggregate, 672 parts of fine aggregate, 67 parts of fly ash, 40 parts of S95-grade mineral powder, 40 parts of silica fume, 0.9 part of polypropylene fiber, 15 parts of polycarboxylic acid water reducing agent and 135 parts of water.
Preferably, the polycarboxylate superplasticizer is a cika-3300 type superplasticizer; the micro silicon powder is donulanxing-EBS type silicon powder.
Preferably, the compressive strength of the anti-cracking pumping concrete at 28d is more than or equal to 82 MPa.
The second technical problem to be solved by the invention is to provide a preparation method of high-strength anti-crack pumping concrete.
A preparation method of high-strength anti-crack pumping concrete comprises the following steps:
(1) uniformly mixing the coarse aggregate, the fine aggregate, the fly ash, the S95-grade mineral powder, the micro silicon powder and the cement to obtain a premix;
(2) and adding water and the polycarboxylic acid water reducing agent into the premix, uniformly mixing, adding the polypropylene fiber, and uniformly mixing to obtain the high-strength anti-crack pumping concrete.
The invention also provides a pumping method of the high-strength anti-cracking pump concrete.
The pumping method comprises the following steps:
(1) a test pump test was first performed to verify the pumping height of the concrete.
Firstly, erecting pump pipes on a test site, cumulatively arranging 10 right-angle joints, arranging 8 right-angle joints in the horizontal direction and 2 right-angle joints in the vertical direction, wherein the total length of the pump pipes exceeds 100m, the horizontal direction is 90 m, the vertical direction is 20m, and the vertical pumping height is converted into 120m according to JGJ/T10-2011 concrete pumping construction technical rules;
(2) before pumping construction, cement mortar with the mixing ratio consistent with that of the high-strength anti-cracking pumping concrete is used for lubricating a pipeline, then the high-strength anti-cracking pumping concrete is transferred into a ground pump, and the concrete is pumped through the ground pump.
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.
Example 1
(1) Weighing coarse aggregate, fine aggregate, fly ash, S95-grade mineral powder, micro silicon powder and ordinary portland cement according to the mixture ratio shown in Table 1, and sequentially adding the materials into a stirrer to stir for 2-3 minutes to obtain premix; wherein the numerical units of the components in the table are parts by weight; the cement strength grade is 52.5 portland cement; the coarse aggregate is crushed stone with the thickness of 5-20 mm; the fine aggregate is medium sand with fineness modulus of 2.6-3.0, and the mud content is less than 2%; the fly ash is I-grade fly ash.
(2) Weighing water and a polycarboxylic acid water reducing agent, adding the water and the polycarboxylic acid water reducing agent into the premix, uniformly mixing, adding polypropylene fibers, and uniformly mixing to obtain the high-strength anti-crack pumping concrete S1-S5 and D1-D2.
TABLE 1
| Portland cement | Coarse aggregate | Fine aggregate | Fly ash | S95 grade ore powder | Silica fume | Polypropylene fiber | Water reducing agent | Water (W) | |
| S1 | 385 | 1111 | 652 | 67 | 55 | 50 | 1.1 | 12.5 | 130 |
| S2 | 397 | 1160 | 654 | 60 | 50 | 50 | 0.9 | 14.6 | 135 |
| S3 | 410 | 1185 | 672 | 67 | 40 | 40 | 0.9 | 15.0 | 135 |
| S4 | 397 | 1160 | 654 | 70 | 45 | 45 | 0.9 | 14.6 | 135 |
| S5 | 397 | 1160 | 654 | 60 | 50 | 60 | 0.9 | 14.6 | 135 |
| D1 | 397 | 1160 | 654 | 60 | 50 | 50 | 0.9 | 14.6 | 153 |
| D2 | 397 | 1160 | 654 | 60 | 50 | 50 | 0.9 | 14.6 | 112 |
Test example 1
The resulting concrete was tested and the properties are shown in table 2 below.
In the test, the compressive strength test refers to the standard GB/T50081 and 2002 'common concrete mechanical property test standard'; the workability test refers to the standard GB/T50080-2016 standard for testing the performance of common concrete mixture); and detecting the slump, the expansion and the emptying time of the concrete by adopting a slump cone. The slump cone used had a bottom inner diameter of 200mm, a top inner diameter of 100mm, a height of 300mm and a wall cone thickness of 1.6 mm.
TABLE 2
Test example 2
The pump sending is tested and is verified, the pump pipe is connected to the stirring station site for pump testing, 10 right-angle joints are arranged in an accumulated mode, the number of the right-angle joints is 8, the number of the right-angle joints is 2, the total length of the pump pipe is 100m, the length of the pump pipe is 90 m in the horizontal direction, and the length of the pump pipe is 20m in the vertical direction. The pumping performance of each group of concrete is shown in table 3; the vertical pumping height is calculated according to JGJT10 concrete pumping construction technical Specification and is shown in Table 3.
TABLE 3
The method for grading the pumping performance comprises the following steps: the evaluation is carried out from four aspects of small resistance, no segregation, difficult bleeding and no pipeline blockage. The four items are excellent; it is preferable to satisfy the three terms; both are poor; one or all of the unsatisfications are poor. Test example 3 Pumping construction of high-Strength concrete
The high strength concrete S1, S2 and S3 prepared in example 1 was transported to a construction site by a mixer truck, and before pumping construction, the pipeline was lubricated with cement mortar in a proportion consistent with that of the high strength concrete, and then the concrete was transferred to a ground pump, and the concrete was pumped by the ground pump. The pumping machine adopts a diesel pump, the theoretical pumping times are 18/30 (high pressure/low pressure), the conveying pressure is 8.3-12MPa, and a pump pipe with the diameter of 125mm is adopted to continuously convey the concrete.
The high-strength concrete pumped is poured into large-section rectangular and cylindrical concrete structural columns, the formed structural columns have the self-compacting characteristic and the effect of fair-faced concrete, and no crack is generated in the structural columns. The molding effect of S1 is shown in fig. 1.
Claims (9)
1. The anti-crack pumping concrete is characterized by comprising the following raw materials in parts by weight: 420 parts of cement 380, 1210 parts of coarse aggregate 1050, 675 parts of fine aggregate 630, 58-72 parts of fly ash, 40-78 parts of S95-grade mineral powder, 45-60 parts of silica fume, 0.8-5 parts of polypropylene fiber, 12.5-15.1 parts of polycarboxylic acid water reducer and 136 parts of water 128; wherein the water-cement ratio is controlled to be 0.28-0.34; the water-glue ratio is controlled to be 0.23-0.27; the fly ash accounts for 10 to 13 percent of the total amount of all the cementing materials; the mineral powder accounts for 7-14% of the total amount of all the cementing materials; the silica fume accounts for 7-11% of the total amount of all the cementing materials; the ratio of the fly ash to the mineral powder is controlled to be 1.2-1.68; the sand rate is controlled to be 0.3-0.39.
2. The crack-resistant pump concrete according to claim 1, wherein the polypropylene fiber is present in the concrete at a mass fraction of 0.03% to 0.19%.
3. The crack resistant pumped concrete of claim 1, wherein said cement strength grade is 52.5 portland cement; the coarse aggregate is crushed stone with the thickness of 5-20 mm; the fine aggregate is medium sand with fineness modulus of 2.6-3.0, and the mud content is less than 2%; the fly ash is I-grade fly ash.
4. The anti-cracking pump concrete according to claim 1, characterized in that cement 385-410 parts, coarse aggregate 1111-1185 parts, fine aggregate 652-672 parts, fly ash 60-67 parts, S95 grade mineral powder 40-55 parts, silica fume 40-50 parts, polypropylene fiber 0.9-1.1 parts, polycarboxylic acid water reducing agent 12.5-15 parts and water 130-135 parts; wherein the water-cement ratio is controlled to be 0.33-0.34; the water-glue ratio is controlled to be 0.23-0.24; the fly ash accounts for 11-12% of the total amount of all the cementing materials; the mineral powder accounts for 7-10% of the total amount of all the cementing materials; the silica fume accounts for 7-9% of the total amount of all the cementing materials; the ratio of the fly ash to the mineral powder is controlled to be 1.2-1.68; the sand rate is controlled to be 0.36-0.37.
5. The anti-crack pump concrete according to claim 4, wherein the concrete comprises 410 parts of cement, 1185 parts of coarse aggregate, 672 parts of fine aggregate, 67 parts of fly ash, 40 parts of S95-grade mineral powder, 40 parts of silica fume, 0.9 part of polypropylene fiber, 15 parts of polycarboxylic acid water reducing agent and 135 parts of water.
6. The anti-crack pumping concrete according to any one of claims 1 to 5, wherein the polycarboxylic acid water reducer is a water reducer of the type Cika-3300; the micro silicon powder is donulanxing-EBS type silicon powder.
7. The anti-crack pumping concrete according to claim 1, wherein the compressive strength of the anti-crack pumping concrete at 28d is greater than or equal to 82 MPa.
8. The method for preparing the crack-resistant pump concrete according to claim 1, which is carried out by the following steps:
(1) uniformly mixing the coarse aggregate, the fine aggregate, the fly ash, the S95-grade mineral powder, the micro silicon powder and the cement to obtain a premix;
(2) and adding water and the polycarboxylic acid water reducing agent into the premix, uniformly mixing, adding the polypropylene fiber, and uniformly mixing to obtain the anti-crack pumping concrete.
9. The crack-resistant pumpcharge pumping method of any one of claims 1 to 8, characterized by comprising the steps of: before pumping construction, cement mortar with the mixing ratio consistent with that of the anti-crack pumping concrete is used for lubricating a pipeline, then the anti-crack pumping concrete is transferred into a ground pump, and the concrete is pumped through the ground pump.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112851239A (en) * | 2021-01-22 | 2021-05-28 | 广州市粤砼混凝土有限公司 | Pump concrete and preparation method thereof |
| CN113213848A (en) * | 2021-05-21 | 2021-08-06 | 重庆大学 | Multi-scale polypropylene fiber pump concrete |
| CN114919072A (en) * | 2022-05-31 | 2022-08-19 | 河南五建混凝土有限公司 | Commercial concrete containing fine aggregate and preparation method thereof |
| CN115849786A (en) * | 2022-12-26 | 2023-03-28 | 马鞍山国运混凝土有限公司 | Preparation process of high-strength premixed concrete |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385394A (en) * | 2001-12-07 | 2002-12-18 | 北京市城昌商品混凝土联营公司 | Fibre anti-permeation cracking-resistant concrete |
| CN102351477A (en) * | 2011-07-12 | 2012-02-15 | 中铁二十局集团第四工程有限公司 | Mixture for preparing C55 high-intensity ultra-high-pumping concrete |
| KR20160070390A (en) * | 2014-12-10 | 2016-06-20 | 김거영 | Manufacturing method of concrete with silica wet cake refined from fly ash |
| CN105859224A (en) * | 2016-05-13 | 2016-08-17 | 广州大学 | High-strength easily-pumped concrete prepared from hill sand |
| CN106977156A (en) * | 2017-04-13 | 2017-07-25 | 天津金隅混凝土有限公司 | high-strength high-performance concrete and preparation method thereof |
| CN107304117A (en) * | 2016-04-19 | 2017-10-31 | 中建西部建设新疆有限公司 | A kind of Wind turbines tower ultrahigh-strength self-compacting clear-water concrete |
| CN108147746A (en) * | 2017-12-29 | 2018-06-12 | 中建西部建设贵州有限公司 | A kind of Machine-made Sand C120 super high strength concretes for being easy to super high-rise pumping |
| CN110317013A (en) * | 2019-04-29 | 2019-10-11 | 武汉理工大学 | A kind of low-quality C80 machine-made sand concrete and preparation method thereof to gather materials |
-
2019
- 2019-11-11 CN CN201911093464.0A patent/CN110746159A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385394A (en) * | 2001-12-07 | 2002-12-18 | 北京市城昌商品混凝土联营公司 | Fibre anti-permeation cracking-resistant concrete |
| CN102351477A (en) * | 2011-07-12 | 2012-02-15 | 中铁二十局集团第四工程有限公司 | Mixture for preparing C55 high-intensity ultra-high-pumping concrete |
| KR20160070390A (en) * | 2014-12-10 | 2016-06-20 | 김거영 | Manufacturing method of concrete with silica wet cake refined from fly ash |
| CN107304117A (en) * | 2016-04-19 | 2017-10-31 | 中建西部建设新疆有限公司 | A kind of Wind turbines tower ultrahigh-strength self-compacting clear-water concrete |
| CN105859224A (en) * | 2016-05-13 | 2016-08-17 | 广州大学 | High-strength easily-pumped concrete prepared from hill sand |
| CN106977156A (en) * | 2017-04-13 | 2017-07-25 | 天津金隅混凝土有限公司 | high-strength high-performance concrete and preparation method thereof |
| CN108147746A (en) * | 2017-12-29 | 2018-06-12 | 中建西部建设贵州有限公司 | A kind of Machine-made Sand C120 super high strength concretes for being easy to super high-rise pumping |
| CN110317013A (en) * | 2019-04-29 | 2019-10-11 | 武汉理工大学 | A kind of low-quality C80 machine-made sand concrete and preparation method thereof to gather materials |
Non-Patent Citations (1)
| Title |
|---|
| 赵德光 等: "CF80混凝土的配制应用", 《山西建筑》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112851239A (en) * | 2021-01-22 | 2021-05-28 | 广州市粤砼混凝土有限公司 | Pump concrete and preparation method thereof |
| CN112851239B (en) * | 2021-01-22 | 2021-12-31 | 广州市粤砼混凝土有限公司 | Pump concrete and preparation method thereof |
| CN113213848A (en) * | 2021-05-21 | 2021-08-06 | 重庆大学 | Multi-scale polypropylene fiber pump concrete |
| CN114919072A (en) * | 2022-05-31 | 2022-08-19 | 河南五建混凝土有限公司 | Commercial concrete containing fine aggregate and preparation method thereof |
| CN114919072B (en) * | 2022-05-31 | 2024-04-05 | 河南五建混凝土有限公司 | Commercial concrete containing fine aggregate and preparation method thereof |
| CN115849786A (en) * | 2022-12-26 | 2023-03-28 | 马鞍山国运混凝土有限公司 | Preparation process of high-strength premixed concrete |
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