CN105645879A - Preparation method of ultra-high-strength steel fiber reinforced concrete for super-high pumping - Google Patents
Preparation method of ultra-high-strength steel fiber reinforced concrete for super-high pumping Download PDFInfo
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- CN105645879A CN105645879A CN201610098328.0A CN201610098328A CN105645879A CN 105645879 A CN105645879 A CN 105645879A CN 201610098328 A CN201610098328 A CN 201610098328A CN 105645879 A CN105645879 A CN 105645879A
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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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
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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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
Abstract
The invention provides a preparation method of ultra-high-strength steel fiber reinforced concrete for super-high pumping. According to the method, the ultra-high-strength steel fiber reinforced concrete with the strength grade of C150 is prepared by changing proportion of a cementing material and a feeding sequence and can be prepared with conventional production process through a mixing plant, and the problem that concrete with the strength grade of C150 or higher cannot be produced with the conventional process is solved. Common Portland cement as well as coarse and fine aggregate is adopted, and the cement is prepared through technological approaches such as reduction of a water-binder ratio, density enhancement and the like under double-doping actions of a polycarboxylate superplasticizer and a superfine mineral admixture. The prepared concrete has good working performance, the slump flow is 670-700 mm, and loss is basically avoided within 2 h; the viscosity is low, and rewinding time is 3.2-4.2 s; 28 d compressive strength reaches the strength grade of C150, and requirements for pumping construction of super high-rise buildings with height of 600 m or higher can be met.
Description
Technical field
The present invention relates to building material technical field, the preparation method being specially a kind of super high pump-conveying spy's super-high strength steel fiber concrete.
Background technology
The raising of concrete strength, main purpose is in that to continue to meet the requirement to concrete material bearing capacity improved constantly in engineering structure, particularly modern society's population in the world expands contradiction growing between land resource, Super High, super-span structure is made to become the main development direction of modern structure engineering, high performance concrete, and the research of other novel high-performance cement-based material is more and more extensive with application. Requirement to special super high strength concrete is that concrete crushing strength reaches more than 150MPa, and the material of the special super high strength concrete of preparation at present mainly has the new unconventional materials such as non-nuclear density gauge cement-based material, uniform ultra-fine grain dense system, RPC.
Owing to modern concrete engine request concrete should have good mobile performance, to meet pumping construction requirement. And the material such as above-mentioned macro-defect-free cement sill, uniform ultra-fine grain dense system, RPC obviously cannot meet mobility requirement. Therefore, utilize the existing technological approaches of cement concrete, adopt conventional raw materials and common processes, give full play to the traditional advantage that cement concrete raw material is easy to get, technique is simple, with low cost, on high performance concrete basis, develop further the superpower high-performance concrete material of good fluidity, and and then prepare kilometer compressed material, the development of cement concrete is had and is of great significance.
Retrieve through applicant, the research of recycled fine aggregate High-strength self-compaction concrete is had " a kind of ultra high strength concrete and preparation method thereof " (CN103159443B) by prior art, the standby concrete of this patent system has the features such as comprcssive strength superelevation, the more high and low contraction of tensile pressure ratio, self-compaction, but is not directed to pumpability (viscosity, air content etc.) in patent and evaluates;" low viscosity, the mean intensity 120MPa super high strength concrete easily pumped " (201310670490.1), the standby concrete of this patent system has high-strength performance, high-thin arch dam performance and low viscosity performance, mean intensity only has 120MPa, in 4h, divergence is between 650��750mm, rewinding time 3��8s, is suitable for the concrete pumping of 300m and level above thereof. Above-mentioned concrete mean intensity has reached 120MPa, but intensity does not reach C120 strength grade; " a kind of C120 super high strength concrete being prone to super high-rise pumping " (CN104045280A), patent proposes a kind of C120 super high strength concrete being prone to super high-rise pumping with mineral diminishing theory, this concrete prepares in conventional manner, viscosity is low, it is prone to more than 400m super high pump-conveying, and strength grade reaches C120, but patent is not directed to the research of C150 strength grade; " aggregate influence research to 140MPa strength grade concrete performance ", paper studies aggregate kind, grating, maximum particle diameter, particle shape and the sand coarse aggregate ratio impact on super high strength concrete service behaviour and comprcssive strength. Result of the test shows, select maximum particle diameter to be 16mm and 10��16mm rubble to account for the ovum rubble of 70% be aggregate, the self-compacting concrete reference block 90d comprcssive strength that the sand coarse aggregate ratio taking 40% is prepared is up to 145.8MPa, the article simply aggregate impact for concrete performance in laboratory research, is not directed to crucial technology of preparing and preparation technology.
Summary of the invention
For solving the shortcoming and defect part of prior art, the preparation method that the present invention provides a kind of super high pump-conveying spy's super-high strength steel fiber concrete, the method is by changing Binder Materials ratio, feeding sequence, prepare super high pump-conveying spy's super-high strength steel fiber concrete of C150 strength grade, this concrete work performance is excellent, gradual loss is little, and viscosity is low, it is adaptable to 600m and above super high-rise pumping requirement.
The technical scheme is that
The preparation method of described a kind of super high pump-conveying spy's super-high strength steel fiber concrete, it is characterised in that: comprise the following steps:
Step 1: by fluvial sand and basalt granule mixing and stirring, obtain mixture;
Step 2: the mixture that step 1 is obtained and cement, mineral admixture, 80% mixing water mixing and stirring; The weight of described cement is the 34.35%-45.31% of aggregate weight, and the weight of described mineral admixture is the 32.81%-41.98% of aggregate weight, and the weight of the mixing water of described 80% is the 9.09%-9.38% of aggregate weight; Described aggregate weight is the mixture weight that step 1 obtains;
Step 3: mixture step 2 obtained is uniform with remaining mixing water and high-efficiency water-reducing agent of poly-carboxylic acid mix, and the weight of described high-efficiency water-reducing agent of poly-carboxylic acid is the 1.53%-1.67% of aggregate weight;
Step 4: add steel fibre mix in the mixture that step 3 obtains uniformly, obtain super high pump-conveying spy's super-high strength steel fiber concrete; The weight of described steel fibre is the 6.11%-10.94% of aggregate weight.
Further preferred version, the preparation method of described a kind of super high pump-conveying spy's super-high strength steel fiber concrete, it is characterized in that: the mixture in step 2, step 1 obtained and cement, mineral admixture, 80% mixing water mixing and stirring, the weight of described cement is the 34.35% of aggregate weight, the weight of described mineral admixture is the 41.98% of aggregate weight, and the weight of the mixing water of described 80% is the 9.16% of aggregate weight;The weight of high-efficiency water-reducing agent of poly-carboxylic acid described in step 3 is the 1.53% of aggregate weight; The weight of steel fibre described in step 4 is the 6.11% of aggregate weight.
Further preferred version, the preparation method of described a kind of super high pump-conveying spy's super-high strength steel fiber concrete, it is characterized in that: the mixture in step 2, step 1 obtained and cement, mineral admixture, 80% mixing water mixing and stirring, the weight of described cement is the 37.88% of aggregate weight, the weight of described mineral admixture is the 37.88% of aggregate weight, and the weight of the mixing water of described 80% is the 9.09% of aggregate weight; The weight of high-efficiency water-reducing agent of poly-carboxylic acid described in step 3 is the 1.67% of aggregate weight; The weight of steel fibre described in step 4 is the 9.09% of aggregate weight.
Further preferred version, the preparation method of described a kind of super high pump-conveying spy's super-high strength steel fiber concrete, it is characterized in that: the mixture in step 2, step 1 obtained and cement, mineral admixture, 80% mixing water mixing and stirring, the weight of described cement is the 45.31% of aggregate weight, the weight of described mineral admixture is the 32.81% of aggregate weight, and the weight of the mixing water of described 80% is the 9.38% of aggregate weight; The weight of high-efficiency water-reducing agent of poly-carboxylic acid described in step 3 is the 1.64% of aggregate weight; The weight of steel fibre described in step 4 is the 10.94% of aggregate weight.
Further preferred version, the preparation method of described a kind of super high pump-conveying spy's super-high strength steel fiber concrete, it is characterised in that: described mineral admixture is microballon, breeze and silicon ash mixture; Described microballon specific surface area is at least 2400m2/ kg, 28d activity index at least 111%, water demand ratio is less than 93%; Breeze specific surface area is at least 436m2/ kg, 28d activity index at least 101%; Silicon ash specific surface area is at least 15300m2/ kg, 28d activity index is at least 92%, and water demand ratio is less than 116%.
Further preferred version, the preparation method of described a kind of super high pump-conveying spy's super-high strength steel fiber concrete, it is characterised in that: described cement is portland cement, and specific surface area is at least 400m2/ kg, 28d comprcssive strength is not less than 60.1MPa.
Further preferred version, the preparation method of described a kind of super high pump-conveying spy's super-high strength steel fiber concrete, it is characterised in that: described fluvial sand grain diameter is not more than 4.75mm, modulus of fineness 2.5��2.7, clay content is less than 0.9%, and clod content is less than 0.2%.
Further preferred version, the preparation method of described a kind of super high pump-conveying spy's super-high strength steel fiber concrete, it is characterised in that: described basalt granule is 5-16mm continuous grading, crush index is less than 5%, clay content 0%, clod content 0%, without flat-elongated particles.
Further preferred version, the preparation method of described a kind of super high pump-conveying spy's super-high strength steel fiber concrete, it is characterised in that: described length of steel fiber 12��15mm, diameter 0.2-0.3mm, draw ratio 40��60, tensile strength >=2000MPa.
Further preferred version, the preparation method of described a kind of super high pump-conveying spy's super-high strength steel fiber concrete, it is characterised in that: described high-efficiency water-reducing agent of poly-carboxylic acid solid content is not less than 28%, and water-reducing rate is not less than 30%.
Beneficial effect
The different Binder Materials ratios of present invention applicant's systematic study, feeding sequence change the impact on special super-high strength steel fiber concrete performance, and by Orthogonal Optimization Test, obtain the preparation method that the present invention proposes.
The special super-high strength steel fiber concrete that the present invention prepares, can be prepared by mixing plant conventional production process, solves common process and cannot produce C150 and the concrete problem of above strength grade.The special super-high strength steel fiber concrete that the present invention prepares adopts portland cement, the coarse-fine aggregate commonly used, under " double-doped " of high-efficiency water-reducing agent of poly-carboxylic acid and microfine mineral admixture acts on, it is prepared from by reducing the technological approaches such as water-cement ratio and closely knit enhancing. Concrete work performance prepared by the present invention is good, divergence 670-700mm, the basic free of losses of 2h; Viscosity is low, rewinding time 3.2-4.2s; 28d comprcssive strength reaches C150 strength grade, can meet 600m and the requirement of above high-rise building pumping construction. Present invention optimizes special super-high strength steel fiber concrete match ratio and the technological process of production, by adjusting the different proportion of cementitious material system, feeding sequence, alr mode so that fresh concrete pumpability is good, be conducive to construction; The addition of steel fibre significantly improves crack-resistant performance of concrete. Do technological reserve it addition, the preparation method that patent relates to is company's km level super high pump-conveying, promote company brand and be worth.
The additional aspect of the present invention and advantage will part provide in the following description, and part will become apparent from the description below, or is recognized by the practice of the present invention.
Detailed description of the invention
Being described below in detail embodiments of the invention, described embodiment is illustrative of, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
Following example adopt raw material respectively: cement is P. II 52.5 portland cement, specific surface area 400m2/ kg, 28d comprcssive strength 60.1MPa; Breeze is S95 level breeze; Microballon; Silicon ash; Sand is II district's natural river sand, and fluvial sand grain diameter is not more than 4.75mm, modulus of fineness 2.5��2.7, and clay content is less than 0.9%, and clod content is less than 0.2%. ; Rubble is the basalt of 5��16mm continuous grading, crush index less than 5%, clay content 0%, clod content 0%, without flat-elongated particles; Steel fibre is the short steel fibre of 12��15mm, diameter 0.2-0.3mm, draw ratio 40��60, tensile strength >=2000MPa; Additive is high-efficiency water-reducing agent of poly-carboxylic acid, and solid content is not less than 28%, and water-reducing rate is not less than 30%.
Embodiment 1:
Super high pump-conveying spy's super-high strength steel fiber concrete prepared by the present embodiment, raw material ratio (1m3Concrete material usage) as shown in table 1:
Table 1:C150 spy super-high strength steel fiber concrete mix-design (kg/m3)
| Cement | Microballon | Breeze | Silicon ash | Fluvial sand | Basalt | Steel fibre | Mixing water | Water reducer |
| 450 | 300 | 120 | 130 | 550 | 760 | 80 | 150 | 20 |
Step 1: by fluvial sand and basalt granule mixing and stirring, mixing time 30s, obtain mixture;
Step 2: the mixture that step 1 is obtained and cement, mineral admixture, 80% mixing water mix, mixing time 60s, stir; The weight of described cement is the 34.35% of aggregate weight, and the weight of described mineral admixture is the 41.98% of aggregate weight, and the weight of the mixing water of described 80% is the 9.16% of aggregate weight; Described aggregate weight is the mixture weight that step 1 obtains;
Step 3: mixture step 2 obtained mixes with remaining mixing water and high-efficiency water-reducing agent of poly-carboxylic acid, mixing time 210s, mix is uniform, and the weight of described high-efficiency water-reducing agent of poly-carboxylic acid is the 1.53% of aggregate weight;
Step 4: adding steel fibre, mixing time 30s in the mixture that step 3 obtains, mix is uniform, obtains super high pump-conveying spy's super-high strength steel fiber concrete; The weight of described steel fibre is the 6.11% of aggregate weight.
According to mix-design, obtaining special super-high strength steel fiber concrete according to the present embodiment method, workability of concrete and comprcssive strength are as shown in table 2:
Table 2: embodiment 1 prepares special super-high strength steel fiber concrete performance parameter
Being known by the data of table 2, the special super high strength concrete 28d comprcssive strength of preparation reaches C150 strength grade, and pumpability is good, can carry out super high-rise pumping construction.
Embodiment 2:
Super high pump-conveying spy's super-high strength steel fiber concrete prepared by the present embodiment, raw material ratio (1m3Concrete material usage) as shown in table 3:
Table 3:C150 spy super-high strength steel fiber concrete mix-design (kg/m3)
| Cement | Microballon | Breeze | Silicon ash | Fluvial sand | Basalt | Steel fibre | Mixing water | Water reducer |
| 500 | 200 | 220 | 80 | 660 | 660 | 120 | 150 | 22 |
Step 1: by fluvial sand and basalt granule mixing and stirring, mixing time 30s, obtain mixture;
Step 2: the mixture that step 1 is obtained and cement, mineral admixture, 80% mixing water mix, mixing time 60s, stir; The weight of described cement is the 37.88% of aggregate weight, and the weight of described mineral admixture is the 37.88% of aggregate weight, and the weight of the mixing water of described 80% is the 9.09% of aggregate weight; Described aggregate weight is the mixture weight that step 1 obtains;
Step 3: mixture step 2 obtained mixes with remaining mixing water and high-efficiency water-reducing agent of poly-carboxylic acid, mixing time 210s, mix is uniform, and the weight of described high-efficiency water-reducing agent of poly-carboxylic acid is the 1.67% of aggregate weight;
Step 4: adding steel fibre, mixing time 30s in the mixture that step 3 obtains, mix is uniform, obtains super high pump-conveying spy's super-high strength steel fiber concrete; The weight of described steel fibre is the 9.09% of aggregate weight.
According to mix-design, obtaining special super-high strength steel fiber concrete according to the present embodiment method, workability of concrete and comprcssive strength are as shown in table 4:
Table 4: embodiment 2 prepares special super-high strength steel fiber concrete performance parameter
Being known by the data of table 4, the special super high strength concrete 28d comprcssive strength of preparation reaches C150 strength grade, and pumpability is good, can carry out super high-rise pumping construction.
Embodiment 3:
Super high pump-conveying spy's super-high strength steel fiber concrete prepared by the present embodiment, raw material ratio (1m3Concrete material usage) as shown in table 5:
Table 5:C150 spy super-high strength steel fiber concrete mix-design (kg/m3)
| Cement | Microballon | Breeze | Silicon ash | Fluvial sand | Basalt | Steel fibre | Mixing water | Water reducer |
| 580 | 200 | 170 | 50 | 600 | 680 | 140 | 150 | 21 |
Step 1: by fluvial sand and basalt granule mixing and stirring, mixing time 30s, obtain mixture;
Step 2: the mixture that step 1 is obtained and cement, mineral admixture, 80% mixing water mix, mixing time 60s, stir; The weight of described cement is the 45.31% of aggregate weight, and the weight of described mineral admixture is the 32.81% of aggregate weight, and the weight of the mixing water of described 80% is the 9.38% of aggregate weight; Described aggregate weight is the mixture weight that step 1 obtains;
Step 3: mixture step 2 obtained mixes with remaining mixing water and high-efficiency water-reducing agent of poly-carboxylic acid, mixing time 210s, mix is uniform, and the weight of described high-efficiency water-reducing agent of poly-carboxylic acid is the 1.64% of aggregate weight;
Step 4: adding steel fibre, mixing time 30s in the mixture that step 3 obtains, mix is uniform, obtains super high pump-conveying spy's super-high strength steel fiber concrete; The weight of described steel fibre is the 10.94% of aggregate weight.
According to mix-design, obtaining special super-high strength steel fiber concrete according to the present embodiment method, workability of concrete and comprcssive strength are as shown in table 6:
Table 6: embodiment 3 prepares special super-high strength steel fiber concrete performance parameter
Being known by the data of table 6, the special super high strength concrete 28d comprcssive strength of preparation reaches C150 strength grade, and pumpability is good, can carry out super high-rise pumping construction.
Although above it has been shown and described that embodiments of the invention, it is understandable that, above-described embodiment is illustrative of, being not considered as limiting the invention, above-described embodiment can be changed when without departing from principles of the invention and objective, revises, replace and modification by those of ordinary skill in the art within the scope of the invention.
Claims (10)
1. the preparation method of super high pump-conveying spy's super-high strength steel fiber concrete, it is characterised in that: comprise the following steps:
Step 1: by fluvial sand and basalt granule mixing and stirring, obtain mixture;
Step 2: the mixture that step 1 is obtained and cement, mineral admixture, 80% mixing water mixing and stirring; The weight of described cement is the 34.35%-45.31% of aggregate weight, and the weight of described mineral admixture is the 32.81%-41.98% of aggregate weight, and the weight of the mixing water of described 80% is the 9.09%-9.38% of aggregate weight; Described aggregate weight is the mixture weight that step 1 obtains;
Step 3: mixture step 2 obtained is uniform with remaining mixing water and high-efficiency water-reducing agent of poly-carboxylic acid mix, and the weight of described high-efficiency water-reducing agent of poly-carboxylic acid is the 1.53%-1.67% of aggregate weight;
Step 4: add steel fibre mix in the mixture that step 3 obtains uniformly, obtain super high pump-conveying spy's super-high strength steel fiber concrete; The weight of described steel fibre is the 6.11%-10.94% of aggregate weight.
2. the preparation method of a kind of super high pump-conveying spy's super-high strength steel fiber concrete according to claim 1, it is characterized in that: the mixture in step 2, step 1 obtained and cement, mineral admixture, 80% mixing water mixing and stirring, the weight of described cement is the 34.35% of aggregate weight, the weight of described mineral admixture is the 41.98% of aggregate weight, and the weight of the mixing water of described 80% is the 9.16% of aggregate weight; The weight of high-efficiency water-reducing agent of poly-carboxylic acid described in step 3 is the 1.53% of aggregate weight; The weight of steel fibre described in step 4 is the 6.11% of aggregate weight.
3. the preparation method of a kind of super high pump-conveying spy's super-high strength steel fiber concrete according to claim 1, it is characterized in that: the mixture in step 2, step 1 obtained and cement, mineral admixture, 80% mixing water mixing and stirring, the weight of described cement is the 37.88% of aggregate weight, the weight of described mineral admixture is the 37.88% of aggregate weight, and the weight of the mixing water of described 80% is the 9.09% of aggregate weight; The weight of high-efficiency water-reducing agent of poly-carboxylic acid described in step 3 is the 1.67% of aggregate weight; The weight of steel fibre described in step 4 is the 9.09% of aggregate weight.
4. the preparation method of a kind of super high pump-conveying spy's super-high strength steel fiber concrete according to claim 1, it is characterized in that: the mixture in step 2, step 1 obtained and cement, mineral admixture, 80% mixing water mixing and stirring, the weight of described cement is the 45.31% of aggregate weight, the weight of described mineral admixture is the 32.81% of aggregate weight, and the weight of the mixing water of described 80% is the 9.38% of aggregate weight;The weight of high-efficiency water-reducing agent of poly-carboxylic acid described in step 3 is the 1.64% of aggregate weight; The weight of steel fibre described in step 4 is the 10.94% of aggregate weight.
5. the preparation method according to the arbitrary described a kind of super high pump-conveying spy's super-high strength steel fiber concrete of Claims 1 to 4, it is characterised in that: described mineral admixture is microballon, breeze and silicon ash mixture; Described microballon specific surface area is at least 2400m2/ kg, 28d activity index at least 111%, water demand ratio is less than 93%; Breeze specific surface area is at least 436m2/ kg, 28d activity index at least 101%; Silicon ash specific surface area is at least 15300m2/ kg, 28d activity index is at least 92%, and water demand ratio is less than 116%.
6. the preparation method according to the arbitrary described a kind of super high pump-conveying spy's super-high strength steel fiber concrete of Claims 1 to 4, it is characterised in that: described cement is portland cement, and specific surface area is at least 400m2/ kg, 28d comprcssive strength is not less than 60.1MPa.
7. the preparation method of a kind of super high pump-conveying spy's super-high strength steel fiber concrete according to claims 1 to 4, it is characterized in that: described fluvial sand grain diameter is not more than 4.75mm, modulus of fineness 2.5��2.7, clay content is less than 0.9%, and clod content is less than 0.2%.
8. the preparation method of a kind of super high pump-conveying spy's super-high strength steel fiber concrete according to claims 1 to 4, it is characterized in that: described basalt granule is 5-16mm continuous grading, crush index less than 5%, clay content 0%, clod content 0%, without flat-elongated particles.
9. the preparation method of a kind of super high pump-conveying spy's super-high strength steel fiber concrete according to claims 1 to 4, it is characterised in that: described length of steel fiber 12��15mm, diameter 0.2-0.3mm, draw ratio 40��60, tensile strength >=2000MPa.
10. the preparation method of a kind of super high pump-conveying spy's super-high strength steel fiber concrete according to claims 1 to 4, it is characterised in that: described high-efficiency water-reducing agent of poly-carboxylic acid solid content is not less than 28%, and water-reducing rate is not less than 30%.
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| CN106542788A (en) * | 2016-10-18 | 2017-03-29 | 贵州建工混凝土有限责任公司 | A kind of Machine-made Sand C120 steel fibre pump concretes and preparation method thereof |
| CN107473658A (en) * | 2017-08-18 | 2017-12-15 | 东南大学 | A kind of material of ultra-high performance concrete containing coarse aggregate and preparation method thereof |
| CN109665769A (en) * | 2018-11-22 | 2019-04-23 | 中建西部建设湖南有限公司 | A kind of super hardening high performance concrete and preparation method thereof |
| CN111517714A (en) * | 2020-04-07 | 2020-08-11 | 中铁大桥科学研究院有限公司 | Easily-pumped coarse aggregate-containing ultra-high performance concrete and preparation method thereof |
| CN112851233A (en) * | 2021-01-18 | 2021-05-28 | 中交二航局第二工程有限公司 | Steel fiber pump concrete for ultrahigh bridge tower and preparation method thereof |
| CN113004001A (en) * | 2021-02-26 | 2021-06-22 | 上海宝冶工程技术有限公司 | Superfluid steam-curing-free ultrahigh-performance concrete and preparation method thereof |
| CN115028405A (en) * | 2022-05-18 | 2022-09-09 | 湖州众驰建材有限公司 | Ultrahigh-pumping extra-high-strength steel fiber concrete and preparation method thereof |
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| CN109665769B (en) * | 2018-11-22 | 2021-02-26 | 中建西部建设湖南有限公司 | Super early-strength high-performance concrete and preparation method thereof |
| CN111517714A (en) * | 2020-04-07 | 2020-08-11 | 中铁大桥科学研究院有限公司 | Easily-pumped coarse aggregate-containing ultra-high performance concrete and preparation method thereof |
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| CN115028405A (en) * | 2022-05-18 | 2022-09-09 | 湖州众驰建材有限公司 | Ultrahigh-pumping extra-high-strength steel fiber concrete and preparation method thereof |
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