CN111517714B - Easily-pumped coarse aggregate-containing ultra-high performance concrete and preparation method thereof - Google Patents
Easily-pumped coarse aggregate-containing ultra-high performance concrete and preparation method thereof Download PDFInfo
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- CN111517714B CN111517714B CN202010264058.2A CN202010264058A CN111517714B CN 111517714 B CN111517714 B CN 111517714B CN 202010264058 A CN202010264058 A CN 202010264058A CN 111517714 B CN111517714 B CN 111517714B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The application relates to coarse aggregate-containing ultrahigh-performance concrete easy to pump and a preparation method thereof, wherein the coarse aggregate-containing ultrahigh-performance concrete easy to pump is prepared from cement, a viscosity reduction component, a high-activity mineral admixture, fine aggregate, coarse aggregate, a water reducing agent, an air entraining agent, steel fiber and water, wherein the viscosity reduction component consists of fly ash microbeads and limestone powder, and the fly ash microbeads account for 60-85 wt% of the total weight of the viscosity reduction component; according to the application, the raw materials are firstly subjected to dry stirring, and then water is added for uniform stirring, so that the coarse aggregate-containing ultrahigh-performance concrete easy to pump is obtained. The easily-pumped coarse aggregate-containing ultra-high performance concrete has the advantages of low viscosity, good flow property, excellent mechanical property and durability and the like, and can meet the requirements of pumping construction.
Description
Technical Field
The application relates to the technical field of building materials, in particular to coarse aggregate-containing ultra-high performance concrete easy to pump and a preparation method thereof.
Background
The ultra-high performance concrete is a novel cement-based composite material, has ultra-high mechanical strength, low porosity, high toughness and high durability, has wide application prospect in large-span bridges and thin-wall structures, and is also very suitable for severe environments such as oceans, saline-alkali environments and the like, so the ultra-high performance concrete is favored by researchers in the industry.
In view of the problems, researchers currently develop the ultra-high performance concrete containing coarse aggregate, the production cost is reduced, the shrinkage creep is reduced, but the mixing of the coarse aggregate obviously reduces the flowing property of the ultra-high performance concrete, and the pumping construction is difficult. With the popularization and application of the coarse aggregate-containing ultra-high performance concrete, the problem to be solved urgently is to improve the pumping performance of the coarse aggregate-containing ultra-high performance concrete.
In the related technology, Chinese patent CN110128077A discloses a low-viscosity easy-pumping ultra-high performance concrete and a preparation method thereof, cement, silica fume, admixture, sand, gravel, thixotropic reinforcing agent, water reducing agent and defoaming agent are used as main raw materials, the working performance of the concrete is improved by using the thixotropic reinforcing agent, but the preparation process of the thixotropic reinforcing agent is complicated and has high cost, and the thixotropic reinforcing agent is not suitable for large-scale engineering application because of the few practical application cases.
Disclosure of Invention
The embodiment of the application provides coarse aggregate-containing ultrahigh-performance concrete easy to pump and a preparation method thereof, and aims to solve the problem that coarse aggregate-containing ultrahigh-performance concrete is difficult to pump in the related art.
In a first aspect, the invention provides a coarse aggregate-containing ultrahigh-performance concrete easy to pump, which comprises the following raw materials in proportion:
the viscosity reducing component consists of fly ash microbeads and limestone powder, wherein the fly ash microbeads account for 60-85 wt% of the total weight of the viscosity reducing component.
In some embodiments, the high activity mineral admixture is at least one of silica fume, metakaolin.
In some embodiments, the viscosity reducing component consists of fly ash microbeads and limestone powder in a weight ratio of 3: 1; the high-activity mineral admixture comprises silica fume and metakaolin in a weight ratio of 1: 1.
In some embodiments, the fly ash microbeads have an average particle size of 0.5 to 5 μm, the limestone powder has an average particle size of 4 to 8 μm, the silica fume has an average particle size of 0.1 to 1 μm, and the metakaolin has an average particle size of 1 to 2 μm.
In some embodiments, the cement is portland cement or ordinary portland cement above the strength grade 42.5; the fineness modulus of the fine aggregate is 2.6-2.9, the fine aggregate is in continuous gradation, and the mud content is less than or equal to 0.5%.
In some embodiments, the coarse aggregate is one or more of basalt, limestone, granite and diabase, the particle size of the coarse aggregate is 3-10mm, the content of the needle-shaped particles is less than or equal to 1wt%, and the mud content is less than or equal to 0.2 wt%.
In some embodiments, the water reducing agent is a viscosity-reducing polycarboxylic acid high-performance water reducing agent, and the water reducing rate is more than or equal to 40%.
In some embodiments, the air entraining agent is a rosin-based air entraining agent or an ether-based air entraining agent.
In some embodiments, the steel fibers are flat copper-plated steel fibers having a length of 12-14 mm and a diameter of 0.18-0.22 mm; the tensile strength of the steel fiber is more than or equal to 2000 MPa.
In a second aspect, there is provided a method for preparing the above easily pumpable coarse aggregate-containing ultra-high performance concrete, comprising the steps of: weighing the raw materials according to the proportion; and (2) uniformly stirring the weighed cement, the viscosity-reducing component, the high-activity mineral admixture, the fine aggregate, the coarse aggregate, the steel fiber, the water reducer and the air entraining agent, then adding all the water, stirring until the concrete is fully fluidized, and then continuously stirring for a moment to obtain the coarse aggregate-containing ultrahigh-performance concrete easy to pump.
The coarse aggregate-containing ultrahigh-performance concrete easy to pump has excellent mechanical property and durability, good working performance and pumping performance, is easy to pump and construct, and solves the problem of large-scale construction and pumping of the coarse aggregate-containing ultrahigh-performance concrete.
According to the coarse aggregate-containing ultrahigh-performance concrete easy to pump, the raw material proportion of the coarse aggregate-containing ultrahigh-performance concrete is optimized, and the mixing amount of a cementing material and steel fibers is reduced, so that the viscosity of the concrete is reduced, and the production cost is also reduced; as the fly ash microbeads and the limestone powder are used as viscosity reducing components, the fluidity of the mixture can be improved and the viscosity can be reduced due to the good shape coefficient and the filling effect of the limestone powder, a large amount of fly ash microbeads are doped, most of the fly ash microbeads are spherical particles, gaps among cement particles can be filled, free water can be discharged, the fluidity of the mixture is increased, the fly ash microbeads and the fly ash microbeads can also play roles in filling, microcrystal nucleation and the like, and therefore the pore structure can be refined; the additive adopts the viscosity-reducing polycarboxylic acid high-performance water reducing agent and a proper amount of air entraining agent, and the viscosity-reducing polycarboxylic acid high-performance water reducing agent has low molecular weight, short main chain and short side chain, so that the dispersing water-reducing effect and the viscosity-reducing effect can be more efficiently exerted; the tiny independent bubbles of the air entraining agent can play a role of a ball bearing in the concrete mixture, and reduce the friction force among particles, so the fluidity of the mixture is greatly improved, and the frost resistance of the concrete is improved; because the coarse aggregate adopts the gravels with high hardness, uniform size and low mud content and the mixing amount of the gravels is optimized, the adverse effect of the coarse aggregate on the flow property of the concrete is reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The properties of the raw materials used in the following examples are as follows:
the cement adopted in the embodiments 1 to 4 is P.O 42.5.5 ordinary portland cement;
the viscosity reduction components adopted in the embodiments 1 to 4 are mixtures of fly ash microbeads and limestone powder, and the weight ratio of the fly ash microbeads to the limestone powder is 3: 1; wherein the average grain diameter of the fly ash micro-beads is 0.5-5 mu m, and the average grain diameter of the limestone powder is 4-8 mu m;
the high-activity mineral admixture used in examples 1 to 4 is a mixture of silica fume and metakaolin, and the weight ratio of the silica fume to the metakaolin is 1: 1; wherein the average grain size of the silica fume is 0.1-1 μm, and the average grain size of the metakaolin is 1-2 μm;
the fine aggregates adopted in the embodiments 1 to 4 are all natural river sand, are in continuous gradation, have the fineness modulus of 2.9 and the mud content of 0.4 wt%;
the coarse aggregates adopted in examples 1 to 4 are diabase, the particle size is 3 to 10mm, the content of needle-shaped particles in the coarse aggregates is 1wt%, and the mud content is 0.1 wt%; high-hardness coarse aggregates such as basalt, limestone, granite and the like can also be adopted;
the water reducing agents adopted in the embodiments 1 to 4 are all powder viscosity reduction type polycarboxylic acid high-performance water reducing agents, and the water reducing rate is 42%;
the air entraining agents adopted in the embodiments 1-4 are all ether air entraining agents, the 28d compressive strength ratio is 96%, and the ether air entraining agents can be replaced by rosin air entraining agents;
the steel fibers adopted in the embodiments 1 to 4 are all straight copper-plated steel fibers, the length is 12 to 14mm, the diameter is 0.18 to 0.22mm, and the tensile strength is 2200 MPa;
the water used in examples 1-4 was common tap water;
the vertical shaft planetary type compulsory mixers used in examples 1 to 4 can be replaced by double horizontal shaft type compulsory mixers.
Example 1
The raw material formulation for preparing the easily pumpable ultra-high performance concrete containing coarse aggregate in this example is shown in table 1:
TABLE 1 easily pumpable ultra high Performance concrete (kg/m) containing coarse aggregate 3 )
The preparation method of the coarse aggregate-containing ultrahigh-performance concrete easy to pump comprises the following steps:
stirring 600 parts by weight of cement, 150 parts by weight of viscosity reducing component, 150 parts by weight of high-activity mineral admixture, 800 parts by weight of fine aggregate, 500 parts by weight of coarse aggregate, 100 parts by weight of steel fiber, 11 parts by weight of water reducing agent and 0.90 part by weight of air entraining agent in a vertical shaft planetary type forced stirrer for 3 min; adding 178 parts by weight of water into a vertical shaft planetary type forced mixer, stirring for 5min, and after the concrete is fully fluidized, continuing stirring for 2min to prepare the pumped ultra-high performance concrete containing coarse aggregate; and molding and maintaining.
And (3) carrying out performance test on the formed and maintained easy-to-pump coarse aggregate-containing ultrahigh-performance concrete:
the viscosity of the coarse aggregate-containing ultrahigh-performance concrete easy to pump is reflected by the emptying time of the ladle, the viscosity is increased when the emptying time of the ladle is longer, the emptying time and the expansion degree of the ladle are detected and executed according to relevant regulations in GB/T50080-.
The expansion degree of the easily-pumped coarse aggregate-containing ultrahigh-performance concrete prepared in the embodiment is 540mm, the emptying time of the inverted barrel is 5.4s, the curing is carried out for 28d, the compressive strength is 121.3MPa, the breaking strength is 14.7MPa, and the relative dynamic elastic modulus of the 300 times of freeze-thaw cycle mass is 98.1%.
Example 2
The raw material formulation for preparing the easily pumpable ultra-high performance concrete containing coarse aggregate in this example is shown in table 2:
TABLE 2 easily pumpable ultra high performance concrete (kg/m) containing coarse aggregate 3 )
The preparation method of the coarse aggregate-containing ultrahigh-performance concrete easy to pump comprises the following steps:
stirring 550 parts by weight of cement, 125 parts by weight of viscosity reducing component, 225 parts by weight of high-activity mineral admixture, 600 parts by weight of fine aggregate, 700 parts by weight of coarse aggregate, 78 parts by weight of steel fiber, 11.3 parts by weight of water reducing agent and 0.45 part by weight of air entraining agent in a vertical shaft planetary type forced stirrer for 3 min; adding 180 parts by weight of water into a vertical shaft planetary forced mixer, stirring for 5min, and after the concrete is fully fluidized, continuing stirring for 2min to prepare the coarse aggregate-containing ultrahigh-performance concrete easy to pump; and molding and maintaining.
And (3) carrying out performance test on the formed and maintained easy-to-pump coarse aggregate-containing ultrahigh-performance concrete:
the viscosity of the coarse aggregate-containing ultrahigh-performance concrete easy to pump is reflected by the emptying time of the ladle, the viscosity is increased when the emptying time of the ladle is longer, the emptying time and the expansion degree of the ladle are detected and executed according to relevant regulations in GB/T50080-.
The expansion degree of the easily-pumped coarse aggregate-containing ultrahigh-performance concrete prepared in the embodiment is 515mm, the emptying time of the inverted barrel is 7.9s, the curing is carried out for 28d, the compressive strength is 16.8MPa, the breaking strength is 13.4MPa, and the relative dynamic elastic modulus of the 300 times of freeze-thaw cycle is 97.3%.
Example 3
The raw material formulation for preparing the coarse aggregate-containing ultra-high performance concrete which is easy to pump in this example is shown in table 3:
TABLE 3 easily pumpable ultra high performance concrete (kg/m) containing coarse aggregate 3 )
The preparation method of the coarse aggregate-containing ultrahigh-performance concrete easy to pump comprises the following steps:
stirring 650 parts by weight of cement, 125 parts by weight of viscosity reducing component, 125 parts by weight of high-activity mineral admixture, 650 parts by weight of fine aggregate, 650 parts by weight of coarse aggregate, 117 parts by weight of steel fiber, 10.4 parts by weight of water reducing agent and 1.35 parts by weight of air entraining agent in a vertical shaft planetary type forced stirrer for 3 min; adding 187 parts by weight of water into a vertical shaft planetary type forced mixer, stirring for 5min, and after the concrete is fully fluidized, continuing stirring for 2min to prepare the coarse aggregate-containing ultra-high performance concrete easy to pump; and molding and maintaining.
And (3) carrying out performance test on the formed and maintained easy-to-pump coarse aggregate-containing ultrahigh-performance concrete:
the viscosity of the coarse aggregate-containing ultrahigh-performance concrete easy to pump is reflected by the emptying time of the ladle, the viscosity is increased when the emptying time of the ladle is longer, the emptying time and the expansion degree of the ladle are detected and executed according to relevant regulations in GB/T50080-.
The expansion degree of the easily-pumped coarse aggregate-containing ultrahigh-performance concrete prepared by the embodiment is 525mm, the emptying time of a barrel is 6.4s, the curing is carried out for 28d, the compressive strength is 122.3MPa, the breaking strength is 15.1MPa, and the relative dynamic elastic modulus of the 300 times of freeze-thaw cycle is 98.8%.
Example 4
The raw material formulation for preparing the coarse aggregate-containing ultra-high performance concrete which is easy to pump in this example is shown in table 4:
TABLE 4 easily pumpable ultra high performance concrete (kg/m) containing coarse aggregate 3 )
The preparation method of the coarse aggregate-containing ultrahigh-performance concrete easy to pump comprises the following steps:
stirring 500 parts by weight of cement, 175 parts by weight of viscosity reducing component, 225 parts by weight of high-activity mineral admixture, 700 parts by weight of fine aggregate, 600 parts by weight of coarse aggregate, 156 parts by weight of steel fiber, 11.8 parts by weight of water reducing agent and 0.8 part by weight of air entraining agent in a vertical shaft planetary type forced mixer for 3 min; adding 172 parts by weight of water into a vertical shaft planetary type forced mixer, stirring for 5min, and after the concrete is fully fluidized, continuing stirring for 2min to prepare the coarse aggregate-containing ultrahigh-performance concrete easy to pump; and molding and maintaining.
And (3) carrying out performance test on the formed and maintained easy-to-pump coarse aggregate-containing ultrahigh-performance concrete:
the viscosity of the coarse aggregate-containing ultrahigh-performance concrete easy to pump is reflected by the emptying time of the ladle, the viscosity is increased when the emptying time of the ladle is longer, the emptying time and the expansion degree of the ladle are detected and executed according to relevant regulations in GB/T50080-.
The expansion degree of the easily-pumped coarse aggregate-containing ultrahigh-performance concrete prepared in the embodiment is 530mm, the emptying time of the inverted barrel is 6.7s, the curing is carried out for 28d, the compressive strength is 125.1MPa, the breaking strength is 16.5MPa, and the relative dynamic elastic modulus of the 300 times of freeze-thaw cycle is 97.9%.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An easy-to-pump ultra-high performance concrete containing coarse aggregate is characterized in that: comprises the following raw materials in proportion:
cement 500kg/m 3 ～650kg/m 3
Viscosity reducing component 125kg/m 3 ～175kg/m 3
High activity mineral admixture 150kg/m 3 ～250kg/m 3
Fine aggregate 600kg/m 3 ～850kg/m 3
Coarse aggregate 450kg/m 3 ～700kg/m 3
10kg/m of water reducing agent 3 ～13kg/m 3
0.45kg/m air entraining agent 3 ～1.35kg/m 3
Steel fiber 50kg/m 3 ～156kg/m 3
165kg/m water 3 ～187kg/m 3 ；
The viscosity reducing component consists of fly ash microbeads and limestone powder, wherein the fly ash microbeads account for 60-85 wt% of the total weight of the viscosity reducing component.
2. The easy-to-pump coarse aggregate-containing ultra-high performance concrete according to claim 1, wherein: the high-activity mineral admixture is at least one of silica fume and metakaolin.
3. The easily pumpable coarse aggregate-containing ultra-high performance concrete as claimed in claim 2, wherein: the viscosity reduction component consists of fly ash microbeads and limestone powder in a weight ratio of 3: 1; the high-activity mineral admixture comprises silica fume and metakaolin in a weight ratio of 1: 1.
4. An easily pumpable coarse aggregate-containing ultra-high performance concrete as claimed in claim 2 or 3, wherein: the average grain size of the fly ash micro-beads is 0.5-5 mu m, the average grain size of the limestone powder is 4-8 mu m, the average grain size of the silica fume is 0.1-1 mu m, and the average grain size of the metakaolin is 1-2 mu m.
5. The easily pumpable coarse-aggregate ultra-high performance concrete as claimed in claim 1, wherein: the cement is Portland cement or ordinary Portland cement with the strength grade of more than 42.5; the fineness modulus of the fine aggregate is 2.6-2.9, the fine aggregate is in continuous gradation, and the mud content is less than or equal to 0.5%.
6. The easy-to-pump coarse aggregate-containing ultra-high performance concrete according to claim 1, wherein: the coarse aggregate is one or more of basalt, limestone, granite and diabase, the particle size of the coarse aggregate is 3-10mm, the content of the needle-shaped particles is less than or equal to 1wt%, and the mud content is less than or equal to 0.2 wt%.
7. The easy-to-pump coarse aggregate-containing ultra-high performance concrete according to claim 1, wherein: the water reducing agent is a viscosity reduction type polycarboxylic acid high-performance water reducing agent, and the water reducing rate is more than or equal to 40%.
8. The easy-to-pump coarse aggregate-containing ultra-high performance concrete according to claim 1, wherein: the air entraining agent is rosin air entraining agent or ether air entraining agent.
9. The easy-to-pump coarse aggregate-containing ultra-high performance concrete according to claim 1, wherein: the steel fiber is a flat copper-plated steel fiber, the length of the steel fiber is 12-14 mm, and the diameter of the steel fiber is 0.18-0.22 mm; the tensile strength of the steel fiber is more than or equal to 2000 MPa.
10. A method for preparing the easily pumpable coarse aggregate-containing ultra-high performance concrete according to any one of claims 1 to 9, comprising the steps of: weighing the raw materials according to the proportion of any one of claims 1 to 9; and uniformly stirring the weighed cement, the viscosity-reducing component, the high-activity mineral admixture, the fine aggregate, the coarse aggregate, the steel fiber, the water reducer and the air entraining agent, then adding all the water, stirring until the concrete is fully fluidized, and then continuously stirring for a moment to obtain the coarse aggregate-containing ultrahigh-performance concrete easy to pump.
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| CN112521108A (en) * | 2020-12-29 | 2021-03-19 | 云南建投绿色高性能混凝土股份有限公司 | Low-viscosity large-flow-state C150 ultrahigh-performance concrete |
| CN114133177A (en) * | 2021-10-28 | 2022-03-04 | 明阳智慧能源集团股份公司 | Low-carbon C130-C140 ultrahigh-performance self-compacting concrete containing coarse aggregate |
| 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 |
| CN115594447A (en) * | 2022-09-27 | 2023-01-13 | 成都精准混凝土有限公司（Cn） | Super high-rise pumping concrete and preparation method thereof |
| CN115594465A (en) * | 2022-11-07 | 2023-01-13 | 北京市高强混凝土有限责任公司（Cn） | Lightweight ultrahigh-performance concrete |
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| CN110128077A (en) * | 2019-06-06 | 2019-08-16 | 江苏苏博特新材料股份有限公司 | Low viscous easily pumping ultra-high performance concrete of one kind and preparation method thereof |
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| CN104556881B (en) * | 2015-01-19 | 2016-02-17 | 广东冠生土木工程技术有限公司 | A kind of superhigh tenacity concrete and preparation method thereof |
| CN105503054A (en) * | 2015-12-24 | 2016-04-20 | 邢台建工商品混凝土有限公司 | Ultrahigh-strength concrete with ultrahigh pumping performance and preparation method of ultrahigh-strength concrete |
| CN105645879A (en) * | 2016-02-23 | 2016-06-08 | 中建商品混凝土西安有限公司 | Preparation method of ultra-high-strength steel fiber reinforced concrete for super-high pumping |
| 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 |
| CN110451885B (en) * | 2019-08-24 | 2022-04-05 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Viscosity reduction regulation and control method for high-strength and ultrahigh-range pumped concrete based on material granularity matching design |
| CN110885213A (en) * | 2019-11-28 | 2020-03-17 | 桐乡市亚都混凝土有限公司 | Super high-rise pumping concrete and preparation method thereof |
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