CN114409347A - Steam-curing-free low-cost ultrahigh-performance concrete and preparation method thereof - Google Patents

Steam-curing-free low-cost ultrahigh-performance concrete and preparation method thereof Download PDF

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CN114409347A
CN114409347A CN202111305439.1A CN202111305439A CN114409347A CN 114409347 A CN114409347 A CN 114409347A CN 202111305439 A CN202111305439 A CN 202111305439A CN 114409347 A CN114409347 A CN 114409347A
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performance concrete
cost
ultrahigh
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腾银见
王宁
夏艳晴
林燕
阳黎
张雨晴
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Jiahua Special Cement Co ltd
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Jiahua Special Cement Co ltd
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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
    • C04B28/06—Aluminous cements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/245—Curing concrete articles
    • 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
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/26—Carbonates
    • C04B14/28—Carbonates of calcium
    • 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
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/146—Silica fume
    • 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
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses steam-curing-free low-cost ultrahigh-performance concrete and a preparation method thereof, relates to the technical field of building materials, and solves the problems of high cost and complicated curing of the ultrahigh-performance concrete in the prior art. The steam-curing-free low-cost ultrahigh-performance concrete is prepared from the following raw materials in parts by weight: 40-55 parts of ordinary portland cement; 5-20 parts of quick-hardening sulphoaluminate cement; 0-15 parts of mineral powder; 5-20 parts of silica fume; 15-25 parts of fly ash; 5-20 parts of limestone powder; 80-125 parts of machine-made sand; 12-18 parts of waste steel fibers; 1-2 parts of a water reducing agent; 17-20 parts of water. The preparation method of the steam-curing-free low-cost ultrahigh-performance concrete comprises the following steps: weighing the raw materials in parts by weight; and uniformly mixing the raw materials to obtain the steam curing-free low-cost ultrahigh-performance concrete. The steam-curing-free low-cost ultrahigh-performance concrete has the advantages of low cost, simple and convenient production and excellent performances.

Description

Steam-curing-free low-cost ultrahigh-performance concrete and preparation method thereof
Technical Field
The invention relates to the technical field of building materials, in particular to steam-curing-free low-cost ultrahigh-performance concrete and a preparation method thereof.
Background
In recent years, with the development of the construction industry, the construction engineering gradually moves to ultrahigh height and ultra-large span, and the requirements on the mechanical properties of building materials are higher and higher. Meanwhile, with the continuous progress of urbanization in China, more and more severe areas in severe environments such as severe cold, severe summer heat, dryness, saline-alkali, sand storm and the like need to be constructed, the requirements of the building engineering of the severe environment areas on the durability of concrete materials are very strict, and the service lives of a plurality of bridges are more than one hundred years. The building industry has increasingly demanded higher Performance from building materials, and many researchers have been investing in the research of Ultra-High Performance Concrete (UHPC) materials.
Compared with common concrete and high-performance concrete, UHPC has excellent performance. In the aspect of mechanical property, the UHPC is far better than common concrete and high-strength concrete, the compressive strength is higher than 100MPa, the breaking strength is higher than 12MPa, and the fracture energy can reach 30000 J.m-2. The traditional concrete belongs to a brittle material and has better compression resistance, but the fracture and shear resistance is very poor, and because the UHPC is doped with a fiber material, the fracture and shear resistance and the toughness are greatly improved, compared with the traditional concrete, the fracture strength of the UHPC is higher by one order of magnitude, and the fracture energy is higher by two orders of magnitude. In the aspect of durability, due to the low water-to-gel ratio of UHPC, the compact and packed whole of raw material particles is particularly compact, the porosity is only below 9 percent, even the porosity of UHPC is close to 2 percent, and the aperture of a pore structure in the UHPC structure is about 10 nm. Therefore, the UHPC has extremely low permeability, strong environmental medium erosion resistance and abrasion resistance, and the durability is far superior to that of the traditional concrete.
UHPC breaks through many of the limits of cement-based material properties and application areas. Whether the composition of structural material components, the performance of cement-based materials, the composition of fiber reinforced materials or the combination of other structural materials opens up a lot of development spaces, and the application of UHPC in various engineering is started at present, so that the development and application of UHPC are high-grade soon once the performance and advantages of UHPC are recognized.
Currently, the promotion and application obstruction of UHPC is still large, wherein the raw materials of the UHPC generally adopt high-quality quartz sand and quartz powder as aggregates, copper-plated micro steel fibers as reinforcing fiber materials, high-activity silica fume, fly ash and mineral powder as active admixtures, and a water reducing agent with high water reducing rate as an additive, so that the raw material cost of the UHPC is high; the maintenance system of UHPC is more complicated and complicated compared with the traditional concrete, and generally comprises the maintenance processes of standing still, initial maintenance, final maintenance, natural maintenance and the like. Therefore, it is an urgent need to solve the problems of the art to provide a concrete which not only has high quality of ultra-high performance concrete, but also has low cost and simple production.
Disclosure of Invention
The invention aims to provide a steam-curing-free low-cost ultrahigh-performance concrete, and solves the problems of high cost and complicated curing of the ultrahigh-performance concrete in the prior art.
The second purpose of the invention is to provide a preparation method of the steam-curing-free low-cost ultrahigh-performance concrete.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention discloses a steam-curing-free low-cost ultrahigh-performance concrete which is prepared from the following raw materials in parts by weight:
40-55 parts of ordinary portland cement; 5-20 parts of quick-hardening sulphoaluminate cement; 0-15 parts of mineral powder; 5-20 parts of silica fume; 15-25 parts of fly ash; 5-20 parts of limestone powder; 80-125 parts of machine-made sand; 12-18 parts of waste steel fibers; 1-2 parts of a water reducing agent; 17-20 parts of water.
In some embodiments of the invention, the composition is prepared from the following raw materials in parts by weight: 45-50 parts of ordinary portland cement; 10-15 parts of quick-hardening sulphoaluminate cement; 5-10 parts of mineral powder; 10-15 parts of silica fume; 15-20 parts of fly ash; 10-15 parts of limestone powder; 95-115 parts of machine-made sand; 14-16 parts of waste steel fibers; 1.5-2 parts of a water reducing agent; 18-19 parts of water.
In some embodiments of the invention, the Portland cement is P.O 42.5R cement;
preferably, the specific surface area of the ordinary portland cement is more than or equal to 300m2In terms of kg, the 3d compressive strength is more than or equal to 22MPa, the 3d flexural strength is more than or equal to 4MPa, the 28d compressive strength is more than or equal to 42.5MPa, and the 28d flexural strength is more than or equal to 6.5 MPa.
In some embodiments of the invention, the rapid hardening sulphoaluminate cement is an r.sac 42.5 cement;
preferably, the specific surface area of the quick-hardening sulphoaluminate cement is more than or equal to 350m2In kg, the 1d compressive strength is more than or equal to 30MPa, the 3d compressive strength is more than or equal to 42.5MPa, the 28d compressive strength is more than or equal to 45MPa, the 1d flexural strength is more than or equal to 6MPa, the 3d flexural strength is more than or equal to 6.5MPa, and the 28d flexural strength is more than or equal to 7 MPa.
In some embodiments of the invention, the specific surface area of the ore fines is 400m or more2Per kg, the 7d activity index is more than or equal to 75 percent, the 28d activity index is more than or equal to 95 percent, and the fluidity ratio is more than or equal to 95 percent;
or/and the specific surface area of the silica fume is more than or equal to 15000m2The activity index of/kg, 7d (7d rapid method) is not less than 105 percent, SiO2The content is more than or equal to 85 percent, and the water demand ratio is less than or equal to 125 percent.
In some embodiments of the invention, the sieve residue of the 45-micron square-hole sieve of the fly ash is less than or equal to 12.0, and the water demand ratio is more than or equal to 95 percent;
or/and the content of the limestone powder and the calcium carbonate is more than or equal to 75 wt.%, the screen residue of a 45-micron square-hole screen is less than or equal to 15, the 7d activity index is more than or equal to 60%, the 28d activity index is more than or equal to 60%, and the fluidity ratio is more than or equal to 100%.
In some embodiments of the invention, the machine-made sand is a continuous graded machine-made sand with an average particle size of 0.15mm to 1.18 mm; the mud content is expressed by the value of sub-blue MB, when the MB value is less than or equal to 0.5, the mass content of the stone powder is less than or equal to 10 percent, and the mud block content is 0 percent; when the MB value is more than 1.4, the mass content of the stone powder is less than or equal to 1 percent, and the content of the mud blocks is 0 percent.
In some embodiments of the invention, the waste steel fibers are waste steel fibers regenerated from waste tires, and the diameter of the waste steel fibers is 0.23-0.35 mm;
or/and the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content is 30 wt.%, and the water reducing rate is more than or equal to 25%.
The invention discloses a preparation method of steam-curing-free low-cost ultrahigh-performance concrete, which comprises the following steps of:
step 1, weighing raw materials in parts by weight;
step 2, uniformly mixing the raw materials to obtain the steam curing-free low-cost ultrahigh-performance concrete;
preferably, in the step 2, the ordinary portland cement, the quick-hardening sulphoaluminate cement, the silica fume, the fly ash, the mineral powder, the limestone powder and the machine-made sand are added into a forced stirrer for dry mixing, the water reducing agent and water with half the mass of the formula amount are uniformly mixed and then added into the stirrer for uniform stirring, and then the rest of water is added into the stirrer for stirring, and simultaneously, the steel fibers are uniformly scattered and uniformly stirred.
Compared with the prior art, the invention has the following beneficial effects:
1. in the invention, solid waste materials such as fly ash, mineral powder and silica fume are adopted to replace cementing materials such as cement, cheap machine-made sand is adopted to replace high-quality quartz sand, and waste steel fibers are adopted to replace expensive copper-plated steel fibers. The cheap raw materials are adopted to replace the original high-quality expensive raw materials, so that the material cost of the ultra-high performance concrete can be greatly reduced, and the physical mechanical property and the durability of the ultra-high performance concrete are not obviously reduced.
2. According to the invention, limestone powder is used as the fine aggregate, so that the particle gradation of the ultra-high performance concrete matrix is improved, the matrix is more compact, the flow property of fresh concrete is improved, and the physical mechanical property and the working performance of the concrete are increased.
3. In the invention, the quick-hardening sulphoaluminate cement is adopted, the early strength of the ultra-high performance concrete can be improved by utilizing the quick-hardening early strength performance of the quick-hardening sulphoaluminate cement, and meanwhile, the early high hydration heat release of the quick-hardening sulphoaluminate cement is beneficial to accelerating the strength development of the ultra-high performance concrete.
4. Active SiO in silica fume, fly ash and mineral powder in gelling system2、Al2O3Ca (OH) which can be produced by hydration with cement2And (3) carrying out secondary hydration reaction (volcanic ash reaction) to generate C-S-H gel, repairing microcracks, filling pores of the cement stones and an interface transition region between the cement stones and the aggregates, and improving the physical and mechanical properties.
5. According to the invention, the curing mode of the ultra-high performance concrete can adopt natural curing, so that an additional high-temperature, steam and steam curing method is avoided, a pouring forming method of common concrete can be adopted, the complexity of the preparation process of the ultra-high performance concrete is greatly reduced, the preparation cost is also greatly reduced, and the expansion of the application field of the ultra-high performance concrete is facilitated.
Detailed Description
The invention is further described below with reference to examples, which are intended to be illustrative only and not to be limiting.
The preparation method comprises the following steps: firstly weighing raw materials according to a mixing ratio, adding weighed ordinary portland cement, quick-hardening sulphoaluminate cement, silica fume, fly ash, mineral powder, limestone powder, machine-made sand and the like into a forced stirrer for dry stirring for 3min, then uniformly mixing half mass of water and a water reducing agent, adding the mixture into the stirrer for stirring for 1min, then adding the remaining half mass of water into the stirrer for stirring, simultaneously uniformly scattering steel fibers and stirring for 3min until the ultrahigh-performance concrete slurry is uniformly stirred, so that the steel fibers are uniformly distributed.
The dosage (by mass) of the raw materials of the ultra-high performance concrete in the embodiment of the invention is shown in the following table:
TABLE 1 ultra high Performance concrete raw materials Table for each example
Figure BDA0003339926850000041
The ordinary Portland cement in the embodiment of the invention is P.O 42.5R cement; proportion tableThe area is more than or equal to 300m2In terms of kg, the 3d compressive strength is more than or equal to 22MPa, the 3d flexural strength is more than or equal to 4MPa, the 28d compressive strength is more than or equal to 42.5MPa, and the 28d flexural strength is more than or equal to 6.5 MPa.
The rapid hardening sulphoaluminate cement in the embodiment of the invention is R.SAC 42.5 cement; the specific surface area is more than or equal to 350m2In kg, the 1d compressive strength is more than or equal to 30MPa, the 3d compressive strength is more than or equal to 42.5MPa, the 28d compressive strength is more than or equal to 45MPa, the 1d flexural strength is more than or equal to 6MPa, the 3d flexural strength is more than or equal to 6.5MPa, and the 28d flexural strength is more than or equal to 7 MPa.
The specific surface area of the mineral powder in the embodiment of the invention is more than or equal to 400m2Per kg, the 7d activity index is more than or equal to 75 percent, the 28d activity index is more than or equal to 95 percent, and the fluidity ratio is more than or equal to 95 percent;
the specific surface area of the silica fume in the embodiment of the invention is more than or equal to 15000m2The activity index of/kg, 7d (7d rapid method) is not less than 105 percent, SiO2The content is more than or equal to 85 percent, and the water demand ratio is less than or equal to 125 percent.
The screen residue of a 45-micron square-hole sieve of the fly ash in the embodiment of the invention is less than or equal to 12.0, and the water demand ratio is more than or equal to 95 percent;
in the embodiment of the invention, the content of limestone powder and calcium carbonate is more than or equal to 75 wt.%, the screen residue of a 45-micron square-hole screen is less than or equal to 15, the 7d activity index is more than or equal to 60%, the 28d activity index is more than or equal to 60%, and the fluidity ratio is more than or equal to 100%.
The machine-made sand in the embodiment of the invention is continuous graded machine-made sand with the average grain diameter of 0.15 mm-1.18 mm; the mud content is expressed by the value of sub-blue MB, when the MB value is less than or equal to 0.5, the mass content of the stone powder is less than or equal to 10 percent, and the mud block content is 0 percent; when the MB value is more than 1.4, the mass content of the stone powder is less than or equal to 1 percent, and the content of the mud blocks is 0 percent.
The waste steel fiber in the embodiment of the invention is a waste tire regenerated waste steel fiber, and the diameter is 0.23-0.35 mm;
the water reducing agent in the embodiment of the invention is a polycarboxylic acid high-performance water reducing agent, the solid content is 30 wt.%, and the water reducing rate is more than or equal to 25%.
Example 1
The embodiment discloses a preparation method of steam-curing-free low-cost ultrahigh-performance concrete, which specifically comprises the following steps:
step 1, weighing 5500g of ordinary portland cement, 500g of fast-hardening sulphoaluminate cement, 1500g of mineral powder, 1000g of silica fume, 1500g of fly ash, 1500g of limestone powder, 11500g of machine-made sand, 1400g of waste steel fiber, 100g of water reducer and 1800g of water;
and 2, adding ordinary portland cement, quick-hardening sulphoaluminate cement, silica fume, fly ash, mineral powder, limestone powder and machine-made sand into a forced stirrer, dry-stirring for 3min, uniformly mixing a water reducing agent and 900g of water, adding the mixture into the stirrer, uniformly stirring, adding the rest of water into the stirrer, uniformly scattering steel fibers, and uniformly stirring to obtain the steam-curing-free low-cost ultrahigh-performance concrete.
Example 2
The embodiment discloses a preparation method of steam-curing-free low-cost ultrahigh-performance concrete, which specifically comprises the following steps:
step 1, weighing 4500g of ordinary portland cement, 1500g of fast-hardening sulphoaluminate cement, 1000g of mineral powder, 500g of silica fume, 2500g of fly ash, 2000g of limestone powder, 8000g of machine-made sand, 1800g of waste steel fiber, 100g of water reducing agent and 1700g of water;
and 2, adding ordinary portland cement, quick-hardening sulphoaluminate cement, silica fume, fly ash, mineral powder, limestone powder and machine-made sand into a forced stirrer, dry-stirring for 3min, uniformly mixing a water reducing agent and 850g of water, adding the mixture into the stirrer, uniformly stirring, adding the rest of water into the stirrer, uniformly scattering steel fibers, and uniformly stirring to obtain the steam-curing-free low-cost ultrahigh-performance concrete.
Example 3
The embodiment discloses a preparation method of steam-curing-free low-cost ultrahigh-performance concrete, which specifically comprises the following steps:
step 1, weighing 5000g of ordinary portland cement, 1000g of quick-hardening sulphoaluminate cement, 500g of mineral powder, 1500g of silica fume, 2000g of fly ash, 1000g of limestone powder, 9500g of machine-made sand, 1600g of waste steel fiber, 150g of water reducing agent and 1900g of water;
and 2, adding ordinary portland cement, quick-hardening sulphoaluminate cement, silica fume, fly ash, mineral powder, limestone powder and machine-made sand into a forced stirrer, dry-stirring for 3min, uniformly mixing a water reducing agent and 950g of water, adding the mixture into the stirrer, uniformly stirring, adding the rest of water into the stirrer, uniformly scattering steel fibers, and uniformly stirring to obtain the steam-curing-free low-cost ultrahigh-performance concrete.
Example 4
The embodiment discloses a preparation method of steam-curing-free low-cost ultrahigh-performance concrete, which specifically comprises the following steps:
step 1, weighing 4000g of ordinary portland cement, 2000g of quick-hardening sulphoaluminate cement, 2000g of silica fume, 2000g of fly ash, 500g of limestone powder, 12500g of machine-made sand, 1200g of waste steel fiber, 200g of water reducer and 2000g of water;
and 2, adding ordinary portland cement, quick-hardening sulphoaluminate cement, silica fume, fly ash, mineral powder, limestone powder and machine-made sand into a forced stirrer, dry-stirring for 3min, uniformly mixing a water reducing agent and 950g of water, adding the mixture into the stirrer, uniformly stirring, adding the rest of water into the stirrer, uniformly scattering steel fibers, and uniformly stirring to obtain the steam-curing-free low-cost ultrahigh-performance concrete.
Comparative examples 1 to 5 were conducted to examine the type and amount of aggregate used in the non-autoclaved, low-cost, ultra-high performance concrete of the present invention.
Comparative example 1
Compared with the embodiment 1, the grain diameter of the machine-made sand is 3-5 mm, and other conditions are consistent.
Comparative example 2
Compared with the embodiment 1, the grain diameter of the machine-made sand is half 0.15-1.18 mm, the grain diameter of the machine-made sand is the other half 3-5 mm, and other conditions are consistent.
Comparative example 3
Compared with the embodiment 1, the particle size of 11500g of machine-made sand is 10000g of 0.15-1.18 mm, the particle size of 1500g of machine-made sand is 3-5 mm, and the other conditions are consistent.
Comparative example 4
Compared with the embodiment 1, the dosage of the limestone powder in the comparative example is 300g, and the other conditions are consistent.
Comparative example 5
Compared with example 1, the dosage of the limestone powder in the comparative example is 2500g, and the other conditions are consistent.
Comparative examples 6 to 8 were conducted to examine the amount of the cement silica fume used as the cementitious material for the non-autoclaved, low-cost, ultra-high performance concrete of the present invention.
Comparative example 6
Compared with example 1, the comparative example has no silica fume and the rest conditions are consistent.
Comparative example 7
Compared with example 1, the dosage of the silica fume in the comparative example is 200g, and the rest conditions are consistent.
Comparative example 8
Compared with example 1, the dosage of the silica fume of the comparative example is 2200g, and the rest conditions are consistent.
Test example 1
The non-autoclaved low-cost ultra-high performance concrete prepared in examples 1 to 4 and comparative examples 1 to 8 were subjected to a performance test.
And (3) carrying out slump tests and expansion tests on the freshly-mixed ultrahigh-performance concrete according to GB/T50080-2016 standard of common concrete mixture performance test methods.
The newly-mixed ultra-high performance concrete is molded, the test piece is maintained by adopting a standard maintenance system (20 +/-2 ℃ and the relative humidity of 95 percent), and the physical and mechanical properties of the concrete are tested when the concrete is maintained to a specified age. The compression strength test adopts a cubic test piece of 100mm multiplied by 100mm, and the loading rate is 1.2 MPa/s-1.4 MPa/s; the breaking strength is 100mm multiplied by 400mm prism test piece, and the loading rate is 0.08 MPa/s-0.1 MPa/s.
The results are shown in the following table:
TABLE 2
Figure BDA0003339926850000071
Figure BDA0003339926850000081
The results show that the slump and the expansion of the freshly-mixed ultrahigh-performance concrete of each test group can meet the requirements of working performance, the compressive strength of the ultrahigh-performance concrete of each test group is over 110MPa after being cured for 28d under the standard condition, and the flexural strength of the ultrahigh-performance concrete of each test group is over 30MPa after being cured for 28d under the standard condition.
Comparative examples 1-3 show that with the increase of the doping amount of coarse sand, the physical and mechanical properties of the ultra-high performance concrete are gradually reduced, and the working performance is gradually deteriorated;
comparative examples 4-5 show that the amount of the fine aggregates such as limestone powder and the like has an optimal value, when the amount of the fine aggregates is small, the physical and mechanical properties of the ultra-high performance concrete are poor, the working performance is good, and when the amount of the fine aggregates is large, the physical and mechanical properties of the ultra-high performance concrete are poor and the working performance is poor;
comparative examples 6-8 show that the silica fume has a large influence on the performance of the ultra-high performance concrete, and the physical and mechanical properties of the concrete are gradually improved with the increase of the doping amount of the silica fume, but the working performance is greatly reduced.
In summary, after reading the present disclosure, those skilled in the art should make various other modifications without creative efforts according to the technical solutions and concepts of the present disclosure, which are within the protection scope of the present disclosure.

Claims (9)

1. The steam-curing-free low-cost ultrahigh-performance concrete is characterized by being prepared from the following raw materials in parts by weight:
40-55 parts of ordinary portland cement; 5-20 parts of quick-hardening sulphoaluminate cement; 0-15 parts of mineral powder; 5-20 parts of silica fume; 15-25 parts of fly ash; 5-20 parts of limestone powder; 80-125 parts of machine-made sand; 12-18 parts of waste steel fibers; 1-2 parts of a water reducing agent; 17-20 parts of water.
2. The non-autoclaved low-cost ultrahigh-performance concrete according to claim 1 is characterized by being prepared from the following raw materials in parts by weight: 45-50 parts of ordinary portland cement; 10-15 parts of quick-hardening sulphoaluminate cement; 5-10 parts of mineral powder; 10-15 parts of silica fume; 15-20 parts of fly ash; 10-15 parts of limestone powder; 95-115 parts of machine-made sand; 14-16 parts of waste steel fibers; 1.5-2 parts of a water reducing agent; 18-19 parts of water.
3. The non-autoclaved low-cost ultrahigh-performance concrete according to claim 1 or 2, wherein the ordinary portland cement is P · O42.5R cement;
preferably, the specific surface area of the ordinary portland cement is more than or equal to 300m2In terms of kg, the 3d compressive strength is more than or equal to 22MPa, the 3d flexural strength is more than or equal to 4MPa, the 28d compressive strength is more than or equal to 42.5MPa, and the 28d flexural strength is more than or equal to 6.5 MPa.
4. The non-autoclaved low-cost ultra-high performance concrete according to claim 1 or 2, wherein the rapid hardening sulfoaluminate cement is R-SAC 42.5 cement;
preferably, the specific surface area of the quick-hardening sulphoaluminate cement is more than or equal to 350m2In kg, the 1d compressive strength is more than or equal to 30MPa, the 3d compressive strength is more than or equal to 42.5MPa, the 28d compressive strength is more than or equal to 45MPa, the 1d flexural strength is more than or equal to 6MPa, the 3d flexural strength is more than or equal to 6.5MPa, and the 28d flexural strength is more than or equal to 7 MPa.
5. The non-autoclaved, low-cost and ultra-high performance concrete according to claim 1 or 2, wherein the specific surface area of the ore powder is more than or equal to 400m2Per kg, the 7d activity index is more than or equal to 75 percent, the 28d activity index is more than or equal to 95 percent, and the fluidity ratio is more than or equal to 95 percent;
or/and the specific surface area of the silica fume is more than or equal to 15000m2The activity index of/kg, 7d is more than or equal to 105 percent, SiO2The content is more than or equal to 85 percent, and the water demand ratio is less than or equal to 125 percent.
6. The non-autoclaved low-cost ultrahigh-performance concrete according to claim 1 or 2, wherein the fly ash 45 μm square-hole sieve residue is less than or equal to 12.0, and the water demand ratio is more than or equal to 95%;
or/and the content of the limestone powder and the calcium carbonate is more than or equal to 75 wt.%, the screen residue of a 45-micron square-hole screen is less than or equal to 15, the 7d activity index is more than or equal to 60%, the 28d activity index is more than or equal to 60%, and the fluidity ratio is more than or equal to 100%.
7. The non-autoclaved low-cost ultrahigh-performance concrete according to claim 1 or 2, wherein the machine-made sand is a continuous graded machine-made sand with an average particle size of 0.15mm to 1.18 mm; the mud content is expressed by the value of sub-blue MB, when the MB value is less than or equal to 0.5, the mass content of the stone powder is less than or equal to 10 percent, and the mud block content is 0 percent; when the MB value is more than 1.4, the mass content of the stone powder is less than or equal to 1 percent, and the content of the mud blocks is 0 percent.
8. The non-autoclaved low-cost ultrahigh-performance concrete according to claim 1 or 2, wherein the waste steel fibers are waste steel fibers regenerated from old tires, and the diameter of the waste steel fibers is 0.23-0.35 mm;
or/and the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content is 30 wt.%, and the water reducing rate is more than or equal to 25%.
9. The method for preparing the non-autoclaved low-cost ultrahigh-performance concrete according to any one of claims 1 to 9, characterized by comprising the following steps:
step 1, weighing raw materials in parts by weight;
step 2, uniformly mixing the raw materials to obtain the steam curing-free low-cost ultrahigh-performance concrete;
preferably, in the step 2, the ordinary portland cement, the quick-hardening sulphoaluminate cement, the silica fume, the fly ash, the mineral powder, the limestone powder and the machine-made sand are added into a forced stirrer for dry mixing, the water reducing agent and water with half the mass of the formula amount are uniformly mixed and then added into the stirrer for uniform stirring, and then the rest of water is added into the stirrer for stirring, and simultaneously, the steel fibers are uniformly scattered and uniformly stirred.
CN202111305439.1A 2021-11-05 2021-11-05 Steam-curing-free low-cost ultrahigh-performance concrete and preparation method thereof Pending CN114409347A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114804776A (en) * 2022-05-18 2022-07-29 广州大学 Method for preparing ultra-high performance concrete by using waste common fibers
CN114873959A (en) * 2022-06-15 2022-08-09 四川国统混凝土制品有限公司 Ultrahigh-performance concrete applying machine-made sand and preparation method thereof
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CN114988815A (en) * 2022-06-27 2022-09-02 宁夏赛马科进混凝土有限公司 Sulfate-corrosion-resistant high-performance concrete and preparation method thereof
CN115108777A (en) * 2022-06-10 2022-09-27 浙江交投矿业有限公司 Machine-made sand reactive powder concrete using solid waste stone powder and preparation method thereof
CN115196926A (en) * 2022-08-24 2022-10-18 河南郑大建筑材料有限公司 Ultrahigh-performance concrete and preparation method and application thereof
CN115304311A (en) * 2022-07-14 2022-11-08 福建三凯建筑材料有限公司 Ultrahigh-performance concrete and preparation method thereof
CN115974500A (en) * 2022-12-23 2023-04-18 中铁桥研科技有限公司 Early-strength type ultrahigh-toughness cement-based material and preparation method thereof

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114804776A (en) * 2022-05-18 2022-07-29 广州大学 Method for preparing ultra-high performance concrete by using waste common fibers
CN115108777A (en) * 2022-06-10 2022-09-27 浙江交投矿业有限公司 Machine-made sand reactive powder concrete using solid waste stone powder and preparation method thereof
CN115108777B (en) * 2022-06-10 2023-08-15 浙江交投矿业有限公司 Machine-made sand active powder concrete utilizing solid waste stone powder and preparation method thereof
CN114873959A (en) * 2022-06-15 2022-08-09 四川国统混凝土制品有限公司 Ultrahigh-performance concrete applying machine-made sand and preparation method thereof
CN114953164A (en) * 2022-06-15 2022-08-30 四川国统混凝土制品有限公司 Preparation method of concrete sewage storage tank and sewage storage tank
CN114988815A (en) * 2022-06-27 2022-09-02 宁夏赛马科进混凝土有限公司 Sulfate-corrosion-resistant high-performance concrete and preparation method thereof
CN115304311A (en) * 2022-07-14 2022-11-08 福建三凯建筑材料有限公司 Ultrahigh-performance concrete and preparation method thereof
CN115196926A (en) * 2022-08-24 2022-10-18 河南郑大建筑材料有限公司 Ultrahigh-performance concrete and preparation method and application thereof
CN115974500A (en) * 2022-12-23 2023-04-18 中铁桥研科技有限公司 Early-strength type ultrahigh-toughness cement-based material and preparation method thereof

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