CN111072348B - Ultra-high performance concrete material containing coarse aggregate and preparation method thereof - Google Patents
Ultra-high performance concrete material containing coarse aggregate and preparation method thereof Download PDFInfo
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- CN111072348B CN111072348B CN201911382147.0A CN201911382147A CN111072348B CN 111072348 B CN111072348 B CN 111072348B CN 201911382147 A CN201911382147 A CN 201911382147A CN 111072348 B CN111072348 B CN 111072348B
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present disclosure provides a coarse aggregate-containing ultra-high performance concrete, comprising: the concrete comprises a cementing material, aggregate, a water reducing agent, a shrinkage reducing agent, fiber and water; the cementing material comprises: cement 500-600kg/m330-100kg/m of silica fume350-200kg/m of fly ash330-100kg/m of slag powder3(ii) a The aggregate comprises: fine aggregate 400-800kg/m3500-1000kg/m coarse aggregate3(ii) a The water reducing rate of the water reducing agent is at least 15 percent, which is 1.4 to 2.0 percent of the mass of the cementing material; the shrinkage reducing agent accounts for 0.5-2.0% of the mass of the cementing material; the fiber comprises organic fiber and metal fiber, wherein the organic fiber is 1.0-3.0kg/m3The metal fiber is 10-50kg/m3(ii) a The water-to-gel ratio of the mixture of water, gel material and aggregate is 0.16-0.20. The concrete material disclosed by the invention has the characteristics of low cost, low density, high strength, high toughness and the like.
Description
Technical Field
The disclosure relates to the field of buildings, in particular to an ultra-high performance concrete material containing coarse aggregate and a preparation method thereof.
Background
The concrete is a cement-base composite material, which is an artificial stone material mainly composed of cementing materials (cement and active admixture), coarse and fine aggregates, an additive and water according to a certain proportion, formed by manual or mechanical stirring and vibration, and then cured under specific curing conditions. However, with the development of society, various buildings with high rise, large span and complex structure form begin to develop, and the common concrete has the disadvantages of great self-weight, high brittleness, low tensile strength and the like, thereby seriously affecting and restricting the application range of the common concrete. Ultra-high Performance Concrete (UHPC) is a new cement-based engineering material with Ultra-high strength, Ultra-high toughness and Ultra-high durability, which originates from denmark in the seventies of the nineteenth century, and in the eighties and the ninety years, some countries in europe have begun relatively deep, comprehensive and systematic exploration, and also have achieved some research results, and at the same time, have been applied in small-scale on small projects and Concrete product projects. Since the twentieth century, UHPC began to be the focus of worldwide debate on exploration and application, and french and japan originally published the design guidelines for UHPC.
The ultra-high performance concrete is divided into two types, one is reactive powder concrete without coarse aggregate, and the other is ultra-high performance concrete containing coarse aggregate. Although UHPC has many performance advantages compared with high-performance concrete, fiber concrete and the like, the problems of high raw material cost, complex preparation process and the like always limit large-area popularization and application of UHPC. The reactive powder concrete does not contain coarse aggregate, so that the cost is high and the shrinkage is large when the reactive powder concrete is practically applied in engineering. However, the UHPC containing the coarse aggregate can not only reduce the production cost, but also provide a good mechanical framework for the UHPC in the building construction and reduce the shrinkage deformation, but the addition of the coarse aggregate also brings the risk of increasing the brittleness of the UHPC. Hybrid fiber concrete refers to a mixture of two or more different fibers incorporated into a concrete matrix. Different fibers include two meanings: one is the intermingling of fibers of different properties, such as intermingling of polypropylene fibers and steel fibers or intermingling of basalt fibers and steel fibers; the second is the mixing of fibers with the same property and different shapes, the most studied is the mixing of steel fibers with different shapes and different length-diameter ratios, and the mixing of synthetic fibers with different elastic moduli is carried out in order to pursue economic benefits. Generally speaking, the high modulus fiber has good initial reinforcing effect but high price, the low modulus fiber has poor reinforcing effect but good crack resistance increasing effect and relatively low price, and the fibers with low elastic modulus and high elastic modulus are mixed by reasonable mixing and collocation to make up for the deficiencies of the fibers and fully play the respective characteristics at different loading stages so as to achieve the purpose of reinforcing the performance of concrete.
Disclosure of Invention
To solve at least one of the above technical problems, the present disclosure provides an ultra-high performance concrete containing a coarse aggregate, comprising: the concrete comprises a cementing material, aggregate, a water reducing agent, a shrinkage reducing agent, fiber and water;
an ultra-high performance concrete containing coarse aggregate, comprising: the concrete comprises a cementing material, aggregate, a water reducing agent, a shrinkage reducing agent, fiber and water;
the cementing material comprises: cement 500-600kg/m330-100kg/m of silica fume350-200kg/m of fly ash330-100kg/m of slag powder3；
The aggregate comprises: fine aggregate 400-800kg/m3500-1000kg/m coarse aggregate3；
The water reducing rate of the water reducing agent is at least 15 percent, which is 1.4 to 2.0 percent of the mass of the cementing material;
the shrinkage reducing agent accounts for 0.5-2.0% of the mass of the cementing material;
the fiber comprises organic fiber and metal fiber, wherein the organic fiber is 1.0-3.0kg/m3The metal fiber is 10-50kg/m3；
The water-to-gel ratio of the mixture formed by the water, the gel material and the aggregate is 0.16-0.20.
According to at least one embodiment of the present disclosure, the cementitious material comprises: cement 540-340-60kg/m of silica fume3100-160kg/m fly ash340-80kg/m of slag powder3；
The aggregate comprises: 500-600kg/m fine aggregate3600-900kg/m coarse aggregate3；
The water reducing rate of the water reducing agent is at least 15 percent, which is 1.4 to 2.0 percent of the mass of the cementing material;
the shrinkage reducing agent accounts for 0.5-2.0% of the mass of the cementing material;
the fiber comprises organic fiber and metal fiber, wherein the organic fiber is 1.5-2.5kg/m3The metal fiber is 20-40kg/m3；
The water-to-gel ratio of the mixture formed by the water, the gel material and the aggregate is 0.16-0.20.
According to at least one embodiment of the present disclosure, the cement is a Portland cement of grade 42.5 or 52.5, with a specific surface area greater than 300m2/kg；
The particle size of the silica fume is 0.1-0.3 mu m, and the bulk density is 200-350kg/m3；
The fly ash is I-grade or II-grade, the water requirement ratio is less than 105%, the water content is less than 1%, and the strength activity index is more than 70%;
the slag powder is S95 grade or S105 grade, and the specific surface area is more than 400m2Per kg, the activity index is more than 95 percent, and the water content is less than 1 percent;
according to at least one embodiment of the present disclosure, the fine aggregate is one or more of river sand, quartz sand, machine-made sand, steel slag, fly ash pottery sand and concrete recycled fine aggregate, and the particle size of the fine aggregate is less than 5 mm.
According to at least one embodiment of the present disclosure, the coarse aggregate is one or a mixture of crushed stone, pebble, fly ash ceramsite and concrete recycled coarse aggregate, and the particle size of the coarse aggregate is 5-16 mm.
According to at least one embodiment of the present disclosure, the water reducing agent comprises a powder-type polycarboxylic acid water reducing agent, and the water reducing rate is more than 25%.
According to at least one embodiment of the present disclosure, the shrinkage reducing agent comprises a mixture powder of the inorganic vehicle ethylene glycol.
According to at least one embodiment of the present disclosure, the volume mixing ratio of the organic fibers to the metal fibers is 1:3 to 1: 5.
According to at least one embodiment of the present disclosure, the organic fiber includes one of polypropylene fiber, polyethylene fiber, polyester fiber, polyacrylonitrile fiber, polyvinyl alcohol fiber, ultra-high molecular weight polyethylene fiber;
the metal fibers comprise one of copper plated steel fibers or stainless steel fibers.
According to another aspect of the present disclosure, there is provided a method for preparing ultra-high performance concrete containing coarse aggregate, comprising:
dry-mixing the cementing material, the high-efficiency water reducing agent, the shrinkage reducing agent and the fine aggregate;
adding 60-80% of water consumption in a stirring state, and adding the rest 20-40% of water consumption after stirring for a preset time;
after continuously stirring for a preset time, adding the coarse aggregate and continuously stirring for a preset time;
adding fiber, continuously stirring and pouring for molding.
The disclosed ultra-high performance concrete material has the characteristics of low cost, low density, high strength, high toughness, high anti-knock property, high anti-cracking property, energy conservation, environmental protection and the like, can be widely applied to precast engineering or cast-in-place engineering of various occasions such as roads, bridges, buildings and the like, and solves the problems of high manufacturing cost, large shrinkage, poor toughness and poor anti-knock property of the traditional ultra-high performance concrete.
Detailed Description
The present disclosure will be described in further detail with reference to the following embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail with reference to embodiments.
The invention provides a coarse aggregate-containing ultrahigh-performance concrete and a preparation method thereof, the coarse aggregate is adopted to reduce cost and shrinkage, organic fiber and steel fiber are mixed to improve the toughness of the coarse aggregate ultrahigh-performance concrete, meanwhile, a natural curing process is adopted to greatly reduce the manufacturing cost, and the obtained concrete material has the characteristics of low cost, low density, high strength, high toughness, high anti-knock property, high crack resistance, energy conservation, environmental protection and the like, and can meet the requirements of prefabrication engineering or cast-in-place engineering of various occasions such as roads, bridges, buildings and the like.
According to a first embodiment of the present disclosure, there is provided a coarse aggregate-containing ultra-high performance concrete comprising: the concrete comprises a cementing material, aggregate, a water reducing agent, a shrinkage reducing agent, fiber and water;
the cementing material comprises: cement 500-600kg/m330-100kg/m of silica fume350-200kg/m of fly ash330-100kg/m of slag powder3；
Bone material bagComprises the following steps: fine aggregate 400-800kg/m3500-1000kg/m coarse aggregate3；
The water reducing rate of the water reducing agent is at least 15 percent, which is 1.4 to 2.0 percent of the mass of the cementing material;
the shrinkage reducing agent accounts for 0.5-2.0% of the mass of the cementing material;
the fiber comprises organic fiber and metal fiber, wherein the organic fiber is 1.0-3.0kg/m3The metal fiber is 10-50kg/m3；
The water-gel ratio of the mixture formed by water, gel material and aggregate is 0.16-0.20, and the water-gel ratio refers to the ratio of the mass of water to the total mass of cement, silica fume, fly ash and mineral powder.
Optionally, the cementitious material comprises: cement 540-340-60kg/m of silica fume3100-160kg/m fly ash340-80kg/m of slag powder3；
The aggregate comprises: 500-600kg/m fine aggregate3600-900kg/m coarse aggregate3；
The water reducing rate of the water reducing agent is at least 15 percent, which is 1.4 to 2.0 percent of the mass of the cementing material;
the shrinkage reducing agent accounts for 0.5-2.0% of the mass of the cementing material;
the fiber comprises organic fiber and metal fiber, wherein the organic fiber is 1.5-2.5kg/m3The metal fiber is 20-40kg/m3；
The water-to-gel ratio of the mixture formed by the water, the gel material and the aggregate is 0.16-0.20.
Alternatively, the cement is 42.5-grade or 52.5-grade ordinary portland cement with the specific surface area of more than 300m2Per kg; the particle size of the silica fume is 0.1-0.3 μm, and the bulk density is 200-350kg/m3Wherein SiO is2The content of (A) is about 90%; the fly ash is one of grade I or grade II, the water requirement ratio is less than 105%, the water content is less than 1%, the strength activity index is more than 70%, and the fineness (the screen residue of a 45-micron square-hole screen) of the fly ash is less than 30%. The slag powder is S95 grade or S105 grade, and has a specific surface area of more than 400m2Per kg, the activity index is more than 95 percent, and the water content is less than 1 percent.
Optionally, the fine aggregate is river sand, quartz sand,One or a mixture of machine-made sand, steel slag, fly ash pottery sand and concrete recycled fine aggregate, wherein the particle size is less than 5mm, and the fineness modulus is 2.6-3.0. River sand, quartz sand and machine-made sand are common building materials. Optionally, the bulk density of the steel slag is 950-3The fineness modulus is 2.6-2.8, the particle size is 0.16-5mm, the content of calcium oxide is more than 40%, and the content of magnesium oxide is less than 5%. Optionally, the fly ash pottery sand bulk density is 700-1060kg/m3The cylinder pressure strength is 5-32MPa, the water absorption is 8-15%, and the mud content is less than 0.2%. Optionally, the concrete recycled fine aggregate is obtained by crushing and screening concrete construction waste, the content of mud blocks is less than 1%, the crushing index value is less than 20%, and the bulk density is more than 1350kg/m3。
Optionally, the coarse aggregate is one or a mixture of crushed stone, pebble, fly ash ceramsite and concrete recycled coarse aggregate, and the particle size is 5-16 mm. Broken stones and pebbles are common building materials. The bulk density of the fly ash ceramsite is 600kg/m and 1200kg/m3The cylinder pressure is 5-32MPa, the water absorption is less than 8%, and the mud content is less than 1.2%. The concrete recycled coarse aggregate is obtained by crushing and screening concrete building wastes, the content of micro powder is less than 1.0 percent, the content of mud blocks is less than 0.5 percent, the water absorption rate is less than 3.0 percent, the crushing index is less than 12 percent, and the bulk density is more than 1300kg/m3。
Optionally, the water reducing agent is a powder polycarboxylic acid water reducing agent, the water reducing rate is more than 25%, the bulk density is 500-550g/l, the PH value (20% solution) is 7.0-8.0, the water content is less than 3%, and the ignition loss is more than 85%.
Alternatively, the shrinkage reducing agent is a powder of a mixture of the inorganic vehicle ethylene glycol, having an active ingredient content of about 42% and being readily soluble in water, and having a density of about 400 g/l.
Optionally, the volume mixing ratio of the organic fiber to the steel fiber is 1:3-1:5, wherein the metal fiber is one of copper-plated steel fiber or stainless steel fiber, the appearance is straight, wavy or end hook type steel fiber, the diameter is 0.12-0.3mm, the length is 6-12mm, the length-diameter ratio is 40-100, and the tensile strength is greater than 2500 MPa. Optionally, the organic fiber is one of polypropylene fiber, polyethylene fiber, polyester fiber, polyacrylonitrile fiber, polyvinyl alcohol fiber and ultra-high molecular weight polyethylene fiber, the length is 6-12mm, the equivalent diameter is 10-50um, the tensile strength is more than 400MPa, the elastic modulus is more than 3500MPa, and the elongation at break is 8-30%.
According to another aspect of the disclosure, specifically, a preparation method of the ultra-high performance concrete containing the coarse aggregate is provided, the cementitious material, the high efficiency water reducing agent, the shrinkage reducing agent and the fine aggregate are firstly dry-mixed for 30-60s, then 60-80% of water consumption is added in a mixing state, the remaining 20-40% of water is added after stirring for 120-150s, the slurry is continuously stirred for 120-150s until the slurry is in a flowing state, the coarse aggregate is slowly added, the slurry is continuously stirred for 120-150s, finally the fiber is slowly added, the slurry is cast and molded after continuously stirring for 60-90s, and the mold can be disassembled for use (adjusted according to the seasonal temperature) after curing for 24-48 h at normal temperature.
The components of the coarse aggregate-containing ultrahigh performance concrete of examples 1 to 5 and comparative examples 1 to 2 are shown in table 1,
TABLE 1
Test examples
The coarse aggregate-containing ultrahigh performance concrete components of examples 1 to 5 and comparative examples 1 to 2 were prepared and then tested according to the following preparation methods:
firstly, dry-mixing a cementing material, a high-efficiency water reducing agent, a shrinkage reducing agent and a fine aggregate for 30-60s, then adding 60-80% of water consumption in a mixing state, adding the rest 20-40% of water after stirring for 120-plus-150 s, continuously stirring for 120-plus-150 s until the slurry is in a flowing state, slowly adding the coarse aggregate, continuously stirring for 120-plus-150 s, finally slowly adding fibers, continuously stirring for 60-90s, performing slump expansion test, pouring and forming, maintaining for 24-48 h at normal temperature, and performing compressive strength and flexural strength test after 28d, wherein the test results are shown in Table 2.
TABLE 2
According to the test data in table 2, it can be seen that the ultra-high performance concrete mixing ratio of the present disclosure has better slump expansion and mechanical properties, lower cement consumption, less steel fiber consumption and lower cost compared with comparative example 1 and comparative example 2. For example, the slump expansion of example 1 is 20% higher, the 28d compressive strength is improved by 33% and the 28d flexural strength is improved by 11% than that of comparative example 1.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (9)
1. An ultra-high performance concrete containing coarse aggregate, comprising: the concrete comprises a cementing material, aggregate, a water reducing agent, a shrinkage reducing agent, fiber and water;
the cementing material comprises: cement 500-580kg/m330-100kg/m of silica fume350-200kg/m of fly ash330-100kg/m of slag powder3；
The aggregate comprises: fine aggregate 400-800kg/m3900-class coarse aggregate and 1000kg/m3；
The water reducing rate of the water reducing agent is at least 15 percent, which is 1.4 to 2.0 percent of the mass of the cementing material;
the shrinkage reducing agent accounts for 0.5-2.0% of the mass of the cementing material;
the fiber comprises polypropylene fiber and metal fiber, wherein the polypropylene fiber is 1.0-3.0kg/m3The metal fiber is 10-50kg/m3；
The water-to-gel ratio of the mixture formed by the water, the gel material and the aggregate is 0.16-0.20.
2. The coarse aggregate-containing ultrahigh-performance concrete according to claim 1,
the cementing material comprises: cement 540-340-60kg/m of silica fume3100-160kg/m fly ash340-80kg/m of slag powder3；
The aggregate comprises: 500-600kg/m fine aggregate3900kg/m of coarse aggregate3；
The water reducing rate of the water reducing agent is at least 15 percent, which is 1.4 to 2.0 percent of the mass of the cementing material;
the shrinkage reducing agent accounts for 0.5-2.0% of the mass of the cementing material;
the fiber comprises polypropylene fiber and metal fiber, wherein the polypropylene fiber is 1.5-2.5kg/m3The metal fiber is 20-40kg/m3；
The water-to-gel ratio of the mixture formed by the water, the gel material and the aggregate is 0.16-0.20.
3. The coarse aggregate-containing ultrahigh-performance concrete according to claim 1 or 2,
the cement is 42.5-grade or 52.5-grade ordinary portland cement, and the specific surface area is more than 300m2/kg；
The particle size of the silica fume is 0.1-0.3 mu m, and the bulk density is 200-350kg/m3；
The fly ash is I-grade or II-grade, the water requirement ratio is less than 105%, the water content is less than 1%, and the strength activity index is more than 70%;
the slag powder is S95 grade or S105 grade, and the specific surface area is more than 400m2Per kg, the activity index is more than 95 percent, and the water content is less than 1 percent.
4. The coarse aggregate-containing ultrahigh-performance concrete according to claim 1 or 2,
the fine aggregate is one or more of river sand, quartz sand, machine-made sand, steel slag, fly ash pottery sand and concrete recycled fine aggregate, and the particle size of the fine aggregate is less than 5 mm.
5. The coarse aggregate-containing ultrahigh-performance concrete according to claim 1 or 2,
the coarse aggregate is one or a mixture of crushed stone, pebble, fly ash ceramsite and concrete recycled coarse aggregate, and the particle size of the coarse aggregate is 5-16 mm.
6. The coarse aggregate-containing ultrahigh-performance concrete according to claim 1 or 2,
the water reducing agent comprises a powder polycarboxylic acid water reducing agent, and the water reducing rate is more than 25%.
7. The coarse aggregate-containing ultrahigh-performance concrete according to claim 1 or 2,
the shrinkage reducing agent comprises a mixture powder of an inorganic vehicle, ethylene glycol.
8. The coarse aggregate-containing ultrahigh-performance concrete according to claim 1 or 2,
the volume mixing ratio of the organic fiber to the metal fiber is 1:3-1: 5.
9. A method for preparing ultra-high performance concrete containing coarse aggregate, for preparing the ultra-high performance concrete of claim 1 or 2, comprising:
dry-mixing the cementing material, the high-efficiency water reducing agent, the shrinkage reducing agent and the fine aggregate;
adding 60-80% of water consumption in a stirring state, and adding the rest 20-40% of water consumption after stirring for a preset time;
after continuously stirring for a preset time, adding the coarse aggregate and continuously stirring for a preset time;
adding fiber, continuously stirring and pouring for molding.
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| CN113773004B (en) * | 2021-09-28 | 2022-06-03 | 中建三局绿色产业投资有限公司 | Coarse aggregate-containing ultra-high performance concrete formula and low-cost design method |
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| CN115057659A (en) * | 2022-05-18 | 2022-09-16 | 湖州众驰建材有限公司 | Low-shrinkage low-viscosity ultrahigh-strength concrete and member thereof |
| CN115259789B (en) * | 2022-07-20 | 2023-07-14 | 杭州惠居建筑科技有限公司 | High-thixotropic reinforced concrete for reinforcing thin plate and preparation method thereof |
| CN117658566A (en) * | 2023-11-16 | 2024-03-08 | 中铁二十五局集团第三工程有限公司 | Straight pump concrete and preparation method and application thereof |
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