CN114213093A - Low-carbon low-shrinkage high-strength high-ductility cement-based composite material and preparation method thereof - Google Patents
Low-carbon low-shrinkage high-strength high-ductility cement-based composite material and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 94
- 239000002131 composite material Substances 0.000 title claims abstract description 66
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000003756 stirring Methods 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 23
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 239000010881 fly ash Substances 0.000 claims abstract description 19
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 17
- 239000010440 gypsum Substances 0.000 claims abstract description 17
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 17
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004576 sand Substances 0.000 claims abstract description 15
- 239000012209 synthetic fiber Substances 0.000 claims abstract description 12
- 229920002994 synthetic fiber Polymers 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000005303 weighing Methods 0.000 claims abstract description 3
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 19
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 19
- 235000012241 calcium silicate Nutrition 0.000 claims description 19
- 239000000835 fiber Substances 0.000 claims description 13
- 239000004698 Polyethylene Substances 0.000 claims description 9
- -1 polyethylene Polymers 0.000 claims description 8
- 229920000573 polyethylene Polymers 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 229920005646 polycarboxylate Polymers 0.000 claims description 2
- 230000008439 repair process Effects 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 3
- 239000011398 Portland cement Substances 0.000 description 8
- 238000006703 hydration reaction Methods 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 230000036571 hydration Effects 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- 229910001653 ettringite Inorganic materials 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910052925 anhydrite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—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 calcium sulfate 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2111/2038—Resistance against physical degradation
- C04B2111/2053—Earthquake- or hurricane-resistant materials
-
- 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
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a low-carbon low-shrinkage high-strength high-ductility cement-based composite material and a preparation method thereof, wherein the low-carbon low-shrinkage high-strength high-ductility cement-based composite material comprises the following components in parts by weight: 750 parts of cement 650-plus material, 150 parts of silica fume 100-plus material, 600 parts of fly ash 500-plus material, 450 parts of yellow sand-plus material, 0-100 parts of gypsum, 30-40 parts of high-efficiency water reducing agent, 15-25 parts of synthetic fiber and 250 parts of water 200-plus material; also relates to a preparation method: weighing cement, silica fume, fly ash, yellow sand, gypsum, a high-efficiency water reducing agent, synthetic fiber and water according to the weight parts; pouring cement, silica fume, fly ash, gypsum and yellow sand into a drum-type stirrer in sequence for stirring to obtain a dry mixture A; then adding the high-efficiency water reducing agent into water, uniformly stirring, adding the high-efficiency water reducing agent into the dry mixture A, and mixing and stirring to obtain mortar material B; and finally dispersing and scattering the synthetic fibers into the mortar material B, and stirring to obtain the low-carbon low-shrinkage high-strength high-ductility cement-based composite material. The cement-based composite material disclosed by the invention has the advantages of good mechanical strength and toughness, low carbon and low shrinkage, simple preparation method and process and few raw material varieties.
Description
Technical Field
The invention belongs to the field of construction materials, and particularly relates to a low-carbon low-shrinkage high-strength high-ductility cement-based composite material and a preparation method thereof.
Background
The preparation of the high-ductility cement-based composite material is to design the short fiber reinforced cement-based composite material on the basis of a micromechanics model as a theoretical basis, and reasonably control the properties of fibers and a matrix and the parameters of a fiber/matrix interface so as to ensure that the composite material has the strain hardening characteristic. High ductility cement-based composites typically incorporate 2% by volume blends of polyvinyl alcohol and polyethylene fibers, which are stable to over 3% ultimate tensile strain under uniaxial tension, and which have small crack widths and spacings when tensioned and ultimately fail as multi-crack cracks.
However, the use of large amount of Portland cement for preparing high-ductility cement-based composite materials causes a large amount of greenhouse gas CO2Release and energy consumption. And the larger cement volume ratio ensures that the high-ductility cement-based composite material is easy to generate shrinkage cracks in the hardening process, and the 28d shrinkage strain can reach 1500 mu epsilon. Therefore, the novel high belite sulphoaluminate cement with low carbon and low energy consumption is produced. The content C of mineral composition of the cement2S>C4A3$>C4AF, reduced energy consumption during calcination, and CO2The amount of released is greatly reduced. C2S and C4A3Is matched for useThe method not only can solve the problem of volume stability of the sulphate aluminium cement caused by later strength shrinkage, but also can avoid the disadvantages of low early strength of the cement and the concrete caused by slow hydration of the belite cement. In addition, high belite sulphoaluminate cements have a significantly lower shrinkage than portland cements due to the low exotherm of hydration and the high amount of expansion components. Currently, there is no study on the preparation of high ductility cement-based composites using high belite sulphoaluminate cement.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a low-carbon low-shrinkage type high-strength high-ductility cement-based composite material which has the characteristics of low carbon and low shrinkage on the basis of keeping good mechanical strength and toughness. In addition, the invention also provides a preparation method of the low-carbon low-shrinkage high-strength high-ductility cement-based composite material, which has simple preparation process and few raw material types.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a low-carbon low-shrinkage high-strength high-ductility cement-based composite material, which comprises the following components in parts by weight: 750 parts of cement 650-plus material, 150 parts of silica fume 100-plus material, 600 parts of fly ash 500-plus material, 450 parts of yellow sand-plus material, 0-100 parts of gypsum, 30-40 parts of high-efficiency water reducing agent, 15-25 parts of synthetic fiber and 250 parts of water 200-plus material; the finished product of the cement-based composite material has the compression strength of more than 80MPa in 8d, the drying shrinkage and self-shrinkage of less than 670 mu epsilon and 500 mu epsilon in 84d respectively, and the maximum unit CO2The release was 500kg/t and the minimum tensile strain was 4.4%.
Further, the cement is high belite sulphoaluminate cement, and the mineral component proportion of the cement is C2S(42％-45％)，C4A3$(35-40％)，C4AF (5-10%) and C $ (4-6%), specific surface area 450-2The initial setting time and the final setting time are respectively 25-35min and 50-60min, and the compressive strength of 3d, 7d and 28d is respectively 40-45MPa, 50-55MPa and 60-65 MPa.
Further, the silica fume activity index is more than 95 percent, and the bulk density is 480kg/m3The specific surface area is 210000-2Per kg, the particle size distribution lies predominantly between 0.1 and 0.3. mu.m.
Further, the fly ash is II-grade fly ash, the activity index is more than 80%, and the carbon content is less than 1%.
Further, the yellow sand is medium sand, the fineness modulus is 2.3-2.5, and the bulk density is 1550-3。
Further, the gypsum has the C content of more than 95 percent and the specific surface area of 530-2/kg, wherein C $ represents calcium sulfate CaSO4Is CaSO4Is abbreviated.
Further, the high-efficiency water reducing agent is a PCA type polycarboxylate water reducing agent, the water reducing rate is more than 30 percent, and the density is 1050-3。
Further, the synthetic fiber is high elastic modulus high strength polyethylene fiber with length of 6-12mm, diameter of 21.7 μm, and density of 970kg/m3The tensile strength was 3360MPa, and the elastic modulus was 115 GPa.
In a second aspect of the present invention, a method for preparing a low-carbon low-shrinkage high-strength high-ductility cement-based composite material is provided, which comprises the following steps:
weighing cement, silica fume, fly ash, yellow sand, gypsum, a high-efficiency water reducing agent, synthetic fiber and water according to parts by weight;
step two, pouring cement, silica fume, fly ash, gypsum and yellow sand into a drum mixer in sequence and stirring for 1min to obtain a dry mixture A;
adding the high-efficiency water reducing agent into water, uniformly stirring, adding into the dry mixture A, and mixing and stirring for 3-4min to obtain mortar material B with good uniformity and fluidity;
and step four, dispersing and scattering the synthetic fibers into the mortar material B, and stirring for 2-3min to obtain the low-carbon low-shrinkage high-strength high-ductility cement-based composite material.
The low-carbon low-shrinkage high-strength high-ductility cement-based composite material has good mechanical property and durability, and can be widely applied to seismic load-bearing structure, wall body repair and steel bridge deck pavement.
Compared with the prior art, the low-carbon low-shrinkage high-strength high-ductility cement-based composite material has the beneficial effects that:
(1) the high-ductility cement-based composite material prepared by the invention contains a certain amount of C in raw materials4A3When the calcium aluminate hydrate participates in hydration, a large amount of swelling hydration product ettringite can be generated in the early stage, and the shrinkage can be effectively compensated. Thus, the drying shrinkage and self-shrinkage of the present invention are significantly reduced, with the lowest 84d drying shrinkage and self-shrinkage being 535 μ ε and 401 μ ε, respectively.
(2) The high-ductility cement-based composite material prepared by the invention uses high belite sulphoaluminate cement, and the main component of the high-ductility cement-based composite material comprises C4A3And $ 3. The formation of this mineral component in cement clinker does not decompose large amounts of carbon dioxide and the calcination temperature is lower compared to portland cement clinker. Therefore, the energy consumption for preparing the high-ductility cement-based composite material by using the cement is lower, and CO is generated2The emission is less, and the material is a novel green high-performance material with low energy consumption and low carbon. The high-ductility cement-based composite material unit of the invention is CO2The emission is only 432.3kg/t, while the Portland cement-based unit CO is2The discharge amount was 527.0 kg/t.
(3) The high-ductility cement-based composite material prepared by the method has high strength, particularly because of C in high belite sulphoaluminate cement2The S content is highest, the later strength is greatly increased, the problem of the backward shrinkage of the later strength of the high-strength concrete is solved, and the 28d compressive strength value is 93.6MPa at most.
(4) The high-ductility cement-based composite material prepared by the invention has high toughness, and mainly has moderate interface bonding performance of PE fibers and a matrix due to more non-gelled hydration product ettringite content in hydration products, and is beneficial to the fibers to generate proper slippage without fracture or debonding, so that higher tensile strain is generated. The maximum tensile strain of the invention is as high as 5.1%, and the invention has high ductility.
(5) The invention has the advantages of less variety of required raw materials, simple process flow and lower preparation cost.
Drawings
FIG. 1 is a graph showing the drying shrinkage of the high-strength and high-ductility cement-based composite material in examples 1 to 5.
FIG. 2 is a graph showing the self-shrinkage of the high strength and high ductility cement-based composite material of examples 1 to 5.
Detailed Description
The technical solutions of the present invention will be described clearly and completely in the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The raw materials used in the examples are, if not specified, all known and commercially available chemical raw materials.
The invention relates to a low-carbon low-shrinkage high-strength high-ductility cement-based composite material which comprises the following components in parts by weight: 750 parts of cement 650-plus material, 150 parts of silica fume 100-plus material, 600 parts of fly ash 500-plus material, 450 parts of yellow sand-plus material, 0-100 parts of gypsum, 30-40 parts of high-efficiency water reducing agent, 15-25 parts of synthetic fiber and 250 parts of water 200-plus material;
the finished product of the cement-based composite material has the compression strength of more than 80MPa in 8d, the drying shrinkage and self-shrinkage of less than 670 mu epsilon and 500 mu epsilon in 84d respectively, and the maximum unit CO2The release was 500kg/t and the minimum tensile strain was 4.4%.
Example 1
A high-strength high-ductility cement-based composite material is prepared by the following preparation steps:
step one, sequentially pouring 700 parts of PII52.5 portland cement, 125 parts of silica fume, 560 parts of fly ash and 420 parts of yellow sand into a drum mixer to be mixed for 1min to obtain a dry mixture A;
step two, adding 33 parts of high-efficiency water reducing agent into 235 parts of water, uniformly stirring, adding the mixture into the dry mixture A, and mixing and stirring for 3min to obtain mortar material B with good uniformity and fluidity;
and step three, scattering 17.5 parts of polyethylene fibers into the mortar material B in a dispersing manner, and stirring for 2min to obtain the high-strength high-ductility cement-based composite material.
Example 2
A low-carbon low-shrinkage high-strength high-ductility cement-based composite material is prepared by the following preparation steps:
step one, sequentially pouring 700 parts of high belite sulphoaluminate cement, 125 parts of silica fume, 560 parts of fly ash and 420 parts of yellow sand into a drum mixer to be mixed for 1min to obtain a dry mixture A;
step two, adding 33 parts of high-efficiency water reducing agent into 235 parts of water, uniformly stirring, adding the mixture into the dry mixture A, and mixing and stirring for 3min to obtain mortar material B with good uniformity and fluidity;
and step three, scattering 17.5 parts of polyethylene fibers into the mortar material B in a dispersing manner, and stirring for 2min to obtain the low-carbon low-shrinkage high-strength high-ductility cement-based composite material.
Example 3
A low-carbon low-shrinkage high-strength high-ductility cement-based composite material is prepared by the following preparation steps:
step one, sequentially pouring 700 parts of high belite sulphoaluminate cement, 125 parts of silica fume, 560 parts of fly ash, 35 parts of gypsum and 420 parts of yellow sand into a drum mixer to be mixed for 1min to obtain a dry mixture A;
step two, adding 33 parts of high-efficiency water reducing agent into 235 parts of water, uniformly stirring, adding the mixture into the dry mixture A, and mixing and stirring for 3min to obtain mortar material B with good uniformity and fluidity;
and step three, scattering 17.5 parts of polyethylene fibers into the mortar material B in a dispersing manner, and stirring for 2min to obtain the low-carbon low-shrinkage high-strength high-ductility cement-based composite material.
Example 4
A low-carbon low-shrinkage high-strength high-ductility cement-based composite material is prepared by the following preparation steps:
step one, sequentially pouring 700 parts of high belite sulphoaluminate cement, 125 parts of silica fume, 560 parts of fly ash, 70 parts of gypsum and 420 parts of yellow sand into a drum mixer to be mixed for 1min to obtain a dry mixture A;
step two, adding 33 parts of high-efficiency water reducing agent into 235 parts of water, uniformly stirring, adding the mixture into the dry mixture A, and mixing and stirring for 3min to obtain mortar material B with good uniformity and fluidity;
and step three, scattering 17.5 parts of polyethylene fibers into the mortar material B in a dispersing manner, and stirring for 2min to obtain the low-carbon low-shrinkage high-strength high-ductility cement-based composite material.
Example 5
A low-carbon low-shrinkage high-strength high-ductility cement-based composite material is prepared by the following preparation steps:
step one, sequentially pouring 700 parts of high belite sulphoaluminate cement, 125 parts of silica fume, 560 parts of fly ash, 105 parts of gypsum and 420 parts of yellow sand into a drum mixer to be mixed for 1min to obtain a dry mixture A;
step two, adding 33 parts of high-efficiency water reducing agent into 235 parts of water, uniformly stirring, adding the mixture into the dry mixture A, and mixing and stirring for 3min to obtain mortar material B with good uniformity and fluidity;
and step three, scattering 17.5 parts of polyethylene fibers into the mortar material B in a dispersing manner, and stirring for 2min to obtain the low-carbon low-shrinkage high-strength high-ductility cement-based composite material.
The measured data of the performance parameters in examples 1-5 are shown in Table 1 below.
The implementation effect is as follows:
from examples 1-5, it can be seen that the high belite sulphoaluminate cement-based composite material has higher 7d strength than the portland cement-based composite material, and the compressive strength of the high belite sulphoaluminate cement-based composite material is greatly increased at the age of 28d, which is benefited from the C in the high belite sulphoaluminate cement4A3Promotion of a substantial increase in early strength, C2S promotes a continuous increase in late stage strength.
As shown in FIGS. 1 and 2, the self-shrinkage and drying shrinkage of the high belite sulphoaluminate cement-based composite material are smaller than those of the portland cement-based composite material, and increasing the content of gypsum further reduces the shrinkage of the high belite sulphoaluminate cement-based composite material because the gypsum participates in hydration reaction to generateMore expanded-phase ettringite is formed to reduce the self-contraction. In addition, compared with the Portland cement-based composite material, the high belite sulphoaluminate cement-based composite material greatly reduces CO in the production process2The release amount of the material makes the preparation of the material more green and environment-friendly.
Also, the tensile strain of all examples exceeded 3%, with the high belite sulphoaluminate cement based composites having higher tensile strain.
Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.
Claims (10)
1. The low-carbon low-shrinkage high-strength high-ductility cement-based composite material comprises the following components in parts by weight: 750 parts of cement 650-plus material, 150 parts of silica fume 100-plus material, 600 parts of fly ash 500-plus material, 450 parts of yellow sand-plus material, 0-100 parts of gypsum, 30-40 parts of high-efficiency water reducing agent, 15-25 parts of synthetic fiber and 250 parts of water 200-plus material;
the cement-based composite material has 8d compressive strength of more than 80MPa, 84d drying shrinkage and self-shrinkage of less than 670 mu epsilon and 500 mu epsilon respectively, and maximum unit CO2The release was 500kg/t and the minimum tensile strain was 4.4%.
2. The low-carbon low-shrinkage high-strength high-ductility cement-based composite material as claimed in claim 1, wherein the cement is high belite sulphoaluminate cement with a mineral component ratio of C2S(42％-45％)，C4A3$(35-40％)，C4AF (5-10%) and C $ (4-6%), specific surface area 450-2The initial setting time and the final setting time are respectively 25-35min and 50-60min, and the compressive strength of 3d, 7d and 28d is respectively 40-45MPa, 50-55MPa and 60-65 MPa.
3. The low-carbon low-shrinkage high-strength high-ductility cement-based composite material as claimed in claim 1The material is characterized in that the silica fume activity index is more than 95 percent, and the bulk density is 480kg/m3The specific surface area is 210000-2Per kg, the particle size distribution lies predominantly between 0.1 and 0.3. mu.m.
4. The low-carbon low-shrinkage high-strength high-ductility cement-based composite material as claimed in claim 1, wherein the fly ash is class II fly ash, the activity index is greater than 80%, and the carbon content is less than 1%.
5. The cement-based composite material as claimed in claim 1, wherein the yellow sand is medium sand with fineness modulus of 2.3-2.5 and bulk density of 1550-3。
6. The cement-based composite material as claimed in claim 1, wherein the gypsum contains more than 95% C and has a specific surface area of 530-2/kg。
7. The low-carbon low-shrinkage high-strength high-ductility cement-based composite material as claimed in claim 1, wherein the high-efficiency water reducing agent is PCA type polycarboxylate water reducing agent, the water reducing rate is more than 30%, and the density is 1050-3。
8. The cement-based composite material of claim 1, wherein the synthetic fibers are high-modulus high-strength polyethylene fibers having a length of 6-12mm, a diameter of 21.7 μm, and a density of 970kg/m3The tensile strength was 3360MPa, and the elastic modulus was 115 GPa.
9. A method for preparing a low-carbon low-shrinkage high-strength high-ductility cement-based composite material, which is used for preparing the low-carbon low-shrinkage high-strength high-ductility cement-based composite material as claimed in any one of claims 1 to 8, and is characterized by comprising the following steps of:
weighing cement, silica fume, fly ash, yellow sand, gypsum, a high-efficiency water reducing agent, synthetic fiber and water according to parts by weight;
step two, pouring cement, silica fume, fly ash, gypsum and yellow sand into a drum mixer in sequence and stirring for 1min to obtain a dry mixture A;
adding the high-efficiency water reducing agent into water, uniformly stirring, adding into the dry mixture A, and mixing and stirring for 3-4min to obtain mortar material B with good uniformity and fluidity;
and step four, dispersing and scattering the synthetic fibers into the mortar material B, and stirring for 2-3min to obtain the low-carbon low-shrinkage high-strength high-ductility cement-based composite material.
10. The application of the low-carbon low-shrinkage high-strength high-ductility cement-based composite material is characterized in that the cement-based composite material is used for seismic load-bearing structure, wall body repair and steel bridge deck pavement.
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| CN202111583967.3A CN114213093A (en) | 2021-12-22 | 2021-12-22 | Low-carbon low-shrinkage high-strength high-ductility cement-based composite material and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103664090A (en) * | 2013-12-19 | 2014-03-26 | 中国中材国际工程股份有限公司 | Fiber-hybrid high-ductility cement-based composite material and preparation method thereof |
| CN106380147A (en) * | 2016-09-29 | 2017-02-08 | 万玉君 | High-temperature-resistant high-ductility fiber-reinforced cement-base composite material and preparation method thereof |
| CN109836106A (en) * | 2019-03-06 | 2019-06-04 | 唐山北极熊建材有限公司 | Fast hard cracking resistance cement-based self-leveling mortar powder, slurry, mortar and preparation method |
| CN111285629A (en) * | 2020-03-24 | 2020-06-16 | 天津水泥工业设计研究院有限公司 | Low-shrinkage ultrahigh-performance concrete and preparation method thereof |
-
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- 2021-12-22 CN CN202111583967.3A patent/CN114213093A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103664090A (en) * | 2013-12-19 | 2014-03-26 | 中国中材国际工程股份有限公司 | Fiber-hybrid high-ductility cement-based composite material and preparation method thereof |
| CN106380147A (en) * | 2016-09-29 | 2017-02-08 | 万玉君 | High-temperature-resistant high-ductility fiber-reinforced cement-base composite material and preparation method thereof |
| CN109836106A (en) * | 2019-03-06 | 2019-06-04 | 唐山北极熊建材有限公司 | Fast hard cracking resistance cement-based self-leveling mortar powder, slurry, mortar and preparation method |
| CN111285629A (en) * | 2020-03-24 | 2020-06-16 | 天津水泥工业设计研究院有限公司 | Low-shrinkage ultrahigh-performance concrete and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 国家建材工业局技术情报标准研究所: "《贝利特系列水泥》", 31 August 1982, 国家建材工业局技术情报标准研究所 * |
| 邓德华: "《土木工程材料 第3版》", 31 August 2017, 中国铁道出版社 * |
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