CN115925358A - Light-weight ultrahigh-performance seawater sea sand concrete and preparation method thereof - Google Patents
Light-weight ultrahigh-performance seawater sea sand concrete and preparation method thereof Download PDFInfo
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- CN115925358A CN115925358A CN202211531300.3A CN202211531300A CN115925358A CN 115925358 A CN115925358 A CN 115925358A CN 202211531300 A CN202211531300 A CN 202211531300A CN 115925358 A CN115925358 A CN 115925358A
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- 239000004576 sand Substances 0.000 title claims abstract description 132
- 239000004567 concrete Substances 0.000 title claims abstract description 80
- 239000013535 sea water Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 131
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000000919 ceramic Substances 0.000 claims abstract description 35
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 29
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 21
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 10
- 239000011325 microbead Substances 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000012798 spherical particle Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 2
- 238000009736 wetting Methods 0.000 claims description 2
- 239000004575 stone Substances 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000011374 ultra-high-performance concrete Substances 0.000 description 4
- 239000013505 freshwater Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses light-weight ultrahigh-performance seawater sea sand concrete and a preparation method thereof. The seawater sea sand concrete comprises, by mass, 31.74-36.90 parts of cement, 7.44-8.65 parts of fly ash, 7.84-9.11 parts of silica fume, 5.4-27.35 parts of ceramic sand, 4.70-40.38 parts of sea sand, 4.43-5.53 parts of seawater, 0.74-0.92 part of water reducing agent and 6.15-7.15 parts of copper-plated steel fiber. According to the invention, the common coarse aggregates such as broken stones in the existing concrete material are removed, the ceramic sand is used as the coarse aggregate and the fine aggregate, and the sea sand is used as the fine aggregate, so that the compactness and integrity of the concrete are improved, the defects in the concrete are reduced, and the mechanical property of the concrete is improved; and after the ceramic sand is adopted to replace all coarse aggregates and part of fine aggregates, the density of the prepared seawater sea sand concrete is greatly reduced, and the self weight of the concrete structure is reduced, so that the seawater sea sand concrete can be applied to large-span bridges or buildings which are sensitive to the self weight of the structure.
Description
Technical Field
The invention relates to the technical field of concrete materials, in particular to light-weight ultrahigh-performance seawater sea sand concrete and a preparation method thereof.
Background
With the development of marine economy and ocean strategy in China, a large number of island buildings need to be constructed. However, for offshore and open sea island construction, problems of long-distance transport of concrete raw materials and lack of fresh water and river sand are faced. The distance between partial islands in China is farthest more than 1500km, fresh water, river sand and other materials are conveyed from the land, or seawater desalination and chloride-free treatment of sea sand and coarse aggregate are carried out at construction points, so that a large amount of cost is consumed for constructing temporary buildings. The sea sand is adopted to replace river sand at the construction point, so that the transportation cost can be reduced by using local materials, the price is low, and the damage to the river environment can be reduced. Seawater is regarded as an inexhaustible water resource with unlimited available quantity.
In order to fully utilize seawater and sea sand resources, a large number of scholars research seawater and sea sand concrete with the strength of below C80, wherein the coarse aggregate is common broken stone, and the research shows that the seawater and the sea sand contain more chloride salt and influence the hydration process of cement, and in addition, the sea sand contains more shells and influence the strength, the working performance, the durability and the like of concrete, and the mechanical properties of the seawater and sea sand concrete are different from those of the common concrete. In addition, zhu Deju and the like analyze the influence factors of the mechanical properties of the seawater sand ultrahigh-performance concrete without the coarse aggregate through tests, and find that the steel fiber has the most remarkable effect of improving the mechanical properties of the seawater sand ultrahigh-performance concrete. Wang Jing and the like are not doped with coarse aggregates, and the extra-high performance concrete is prepared by using sea sand which is not desalted, and the mechanical properties of the extra-high performance concrete completely meet the requirements of GB/T31387-2015 reactive powder concrete on the RPC120 grade.
The research shows that the existing seawater and sea sand ultrahigh-performance concrete has better mechanical property, but has higher density, and when the existing seawater and sea sand ultrahigh-performance concrete is used for building a building structure, the self weight of the building is large.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide light-weight ultrahigh-performance seawater sea sand concrete and a preparation method thereof. The seawater sea sand concrete prepared by the invention has higher strength by replacing broken stones and partial sea sand with ceramic sand, and can effectively reduce the dead weight of a concrete structure and enlarge the application range of the seawater sea sand concrete.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the light ultrahigh-performance seawater sea sand concrete comprises, by mass, 31.74-36.90 parts of cement, 7.44-8.65 parts of fly ash, 7.84-9.11 parts of silica fume, 5.4-27.35 parts of ceramic sand, 4.70-40.38 parts of sea sand, 4.43-5.53 parts of seawater, 0.74-0.92 part of a water reducing agent and 6.15-7.15 parts of copper-plated steel fibers.
Preferably, the cement is portland cement.
Preferably, the fly ash has a specific surface area of 1300m 2 Kg, water requirement of 98 percent and sphere density of 2.32g/cm 3 The fly ash micro-beads with the spherical particle content of 91 percent and the fineness of 18 percent.
Preferably, the silica fume has a specific surface area of 19500m 2 /kg，SiO 2 The content is 96.75%, the water demand ratio is 125%, the water content is 0.5%, and the burning vector is 3.7%.
According to the invention, the portland cement, the fly ash micro-beads and the silica fume powder are mixed to form the cementing material, so that the pottery sand and the sea sand are combined together, and the overall strength of the concrete is improved.
Preferably, the ceramic sand has a crushing grade of 800, and comprises coarse ceramic sand with the particle size of 2.36-4.75 mm and fine ceramic sand with the particle size of 0.075-2.36 mm.
Preferably, the mass ratio of the coarse ceramic sand to the fine ceramic sand is 7:3. When the mass ratio of the coarse and fine ceramic sand is 7:3, the accumulation degree between the ceramic sand and various powder materials is larger than that under the condition of other particle size fraction ratios, and the prepared concrete has the highest compressive strength.
Preferably, the sea sand is used as fine aggregate of concrete, and the fineness modulus of the sea sand is 2.2. The seawater is used as water for hydration reaction and is artificial seawater prepared in proportion.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent, the solid content is 50%, the water reducing rate is 28%, and the mass of the water reducing agent is 2.83% of the total mass of the cement, the fly ash and the silica fume. According to the invention, the water reducing agent is utilized to improve the construction performance and the hardening performance of the concrete, cement is saved, energy consumption is reduced, and the compactness of the concrete is improved, and the compactness is improved, so that the corrosion of chloride ions can be effectively prevented, the chloride ion permeation resistance of the concrete is further enhanced, and meanwhile, the compactness is improved, and the mechanical performance of the concrete can also be improved.
Preferably, the copper-plated steel fiber has an elastic modulus of 80 to 90GPa, a nominal length of 13mm, an equivalent diameter of 0.25mm and a breaking strength of > 2000MPa. The invention uses the copper-plated steel fiber as the reinforcing material, can effectively improve the compressive strength of the concrete, improve the compressive and crack resistance of the concrete, and simultaneously increase the durability of the light-weight ultrahigh-performance seawater sea sand concrete.
The invention also provides a preparation method of the light-weight ultrahigh-performance seawater sea sand concrete, which comprises the following steps:
wetting the pottery sand to saturation for later use;
mixing the seawater and the water reducing agent in proportion;
uniformly stirring cement, fly ash and silica fume, then adding a part of mixed solution of seawater and a water reducing agent, and continuously stirring to obtain gelatinous slurry with certain fluidity;
adding sea sand and the wetted ceramic sand into the gelatinous slurry, stirring until the sea sand and the ceramic sand are fully blended into the gelatinous slurry, then adding copper-plated steel fiber and a residual part of mixed solution of the sea water and a water reducing agent, and stirring to obtain a concrete material;
and pouring the concrete material into a mold, and performing standard maintenance to obtain the light-weight ultrahigh-performance seawater sea sand concrete.
The invention has the beneficial effects that:
(1) The strength is high. According to the invention, on the basis of cement, cementing materials such as silica fume and fly ash are added, so that the durability and the long-term strength of concrete are enhanced, meanwhile, the common coarse aggregates such as broken stones in the existing concrete material are removed, ceramic sand is used as the coarse aggregate and the fine aggregate, and sea sand is used as the fine aggregate, so that the compactness and integrity of the concrete are improved, the defects in the concrete are reduced, and the strength is improved.
(2) The self weight is small. Because the weight of coarse and fine aggregates in the concrete accounts for a large proportion of the total weight of the concrete, after the ceramic sand is adopted to replace all coarse aggregates (broken stones) and part of fine aggregates (sea sand), the density of the prepared ultra-high performance seawater sea sand concrete is greatly reduced, the self weight of a concrete structure is reduced, and the ultra-high performance seawater sea sand concrete can be applied to large-span bridges or buildings which are sensitive to the self weight of the structure.
(3) The cost is low. Protects the ecological environment of the land and has higher economic benefit in ocean engineering. The invention takes seawater and sea sand as raw materials, can use local materials in the construction process of ocean engineering, not only reduces the cost of the raw materials, but also reduces the cost of transporting fresh water and sand from inland. Meanwhile, the invention does not adopt river sand and natural gravels, can reduce the further consumption of river sand and natural gravels resources, avoid river sand resources and mountain bodies from being excessively exploited, protect the ecological environment and be beneficial to sustainable development.
(4) The polycarboxylic acid water reducing agent is adopted, so that the mixture has good working performance under the condition of extremely low water-to-gel ratio; the height of the cross section of the structure can be effectively reduced, the self weight is reduced, and the material utilization rate is improved, so that the prepared concrete is suitable for large-scale building structures such as large-span structures and high-rise structures.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious 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 any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The cement of the embodiment of the invention is PO52.5 Portland cement produced by New Cement of Huangshi Hua Hubei; the specific surface area of the fly ash is 1300m 2 Kg, water requirement of 98 percent and sphere density of 2.32g/cm 3 Fly ash micro-beads with 91 percent of spherical particle content and 18 percent of fineness; the silica fume used has a specific surface area of 19500m 2 /kg，SiO 2 96.75 percent of the total water content, 125 percent of the water requirement, 0.5 percent of the water content and 3 percent of the burning vector7 percent; the crushing grade of the ceramic sand is 800 grades, and the ceramic sand comprises coarse ceramic sand and fine ceramic sand, wherein the coarse ceramic sand is continuous graded ceramic sand with the particle size of 2.36-4.75 mm, and the fine ceramic sand is continuous graded ceramic sand with the particle size of 0.075-2.36 mm (the proportion of the coarse ceramic sand and the fine ceramic sand is 7:3); the water reducing agent is a polycarboxylic acid water reducing agent (VIVID-651), the solid content is 50%, and the water reducing rate is 28%; the elastic modulus of the copper-plated steel fiber is 80-90 GPa, the nominal length is 13mm, the equivalent diameter is 0.25mm, and the breaking strength is more than 2000MPa.
Example 1
The embodiment provides a light-weight ultrahigh-performance seawater sea sand concrete which comprises the following components: 36.45kg of Portland cement, 5.2kg of seawater, 4.64kg of sea sand, 27.01kg of ceramsite (the proportion of coarse and fine ceramsite is 7:3), 0.87kg of water reducing agent, 8.55kg of fly ash micro-beads, 9kg of silica fume and 7.07kg of copper-plated steel fibers.
The preparation process comprises the following steps:
(1) The pottery sand is pre-wetted to saturation 24 hours before preparation, and seawater is artificially prepared in advance.
(2) Mixing the seawater and the water reducing agent uniformly according to a proportion.
(3) Adding three powder materials of cement, fly ash microbeads and silica fume into a stirrer, uniformly dry-stirring, then adding 3/4 of mixed liquid of seawater and a water reducing agent into the stirrer, adding sea sand and wetted ceramic sand when stirring to obtain gelled slurry with certain fluidity, continuously stirring until the sea sand and the ceramic sand are fully blended into the gelled slurry, then uniformly screening copper-plated steel fibers into the stirrer by using a screen, pouring the rest 1/4 of mixed liquid of the water reducing agent and the seawater, and continuously stirring for 3 minutes to obtain the concrete material.
(4) And pouring the concrete material into a mold for 24 hours, and then carrying out standard curing to 28d age to obtain the light ultrahigh-performance seawater sea sand concrete.
Example 2
A light-weight ultrahigh-performance seawater sea sand concrete comprises the following components: 36.45kg of Portland cement, 4.74kg of seawater, 23.19kg of sea sand, 15.01kg of ceramic sand (the proportion of coarse and fine ceramic sand is 7:3), 0.79kg of water reducing agent, 8.55kg of fly ash micro-beads, 9kg of silica fume and 7.07kg of copper-plated steel fibers.
The preparation process comprises the following steps:
(1) The pottery sand is pre-wetted to saturation 24 hours before preparation, and seawater is artificially prepared in advance.
(2) Mixing the seawater and the water reducing agent uniformly according to a proportion.
(3) Adding three powder materials of cement, fly ash microbeads and silica fume into a stirrer, uniformly dry-stirring, then adding 3/4 of mixed liquid of seawater and a water reducing agent into the stirrer, adding sea sand and wetted ceramic sand when stirring to obtain gelled slurry with certain fluidity, continuously stirring until the sea sand and the ceramic sand are fully blended into the gelled slurry, then uniformly screening copper-plated steel fibers into the stirrer by using a screen, pouring the rest 1/4 of mixed liquid of the water reducing agent and the seawater, and continuously stirring for 3 minutes to obtain the concrete material.
(4) And pouring the concrete material into a mold for 24 hours, and then carrying out standard curing to 28d age to obtain the light ultrahigh-performance seawater sea sand concrete.
Example 3
A light-weight ultrahigh-performance seawater sea sand concrete comprises the following components: 36.45kg of Portland cement, 4.90kg of seawater, 37.10kg of sea sand, 6kg of ceramsite (the proportion of coarse and fine ceramsite is 7:3), 0.82kg of water reducing agent, 8.55kg of fly ash micro-beads, 9kg of silica fume and 7.07kg of copper-plated steel fibers.
The light ultra-high performance seawater sea sand concrete is prepared by the same preparation process as the embodiment 1.
Comparative example
The general seawater sea sand concrete reported in the research on the mechanical property test of seawater sea sand concrete based on sea sand in different regions comprises the following components: 12.95kg of Portland cement, 6.47kg of seawater, 23.87kg of sea sand, 38.95kg of natural coarse aggregate macadam and 0.10kg of water reducing agent.
Relevant parameters including cubic compression strength, axial tensile strength, splitting strength and elastic modulus of examples 1 to 3 and comparative examples are measured according to the concrete physical mechanical property test method standard (GB/T50081-2019) and the fiber concrete test method standard (CECS 13-2009). The results are shown in Table 1.
TABLE 1
As can be seen from the results in Table 1, compared with the common seawater sea sand concrete, the light-weight ultrahigh-performance seawater sea sand concrete prepared by the invention has the cube compressive strength of over 130MPa, the axial compressive strength of over 120MPa, the splitting strength of over 8MPa, the elastic modulus of over 38GPa and the density of less than 2.5 multiplied by 10 3 kg/m 3 . The invention shows that the ceramic sand is used for replacing the broken stone coarse aggregate and partial sea sand commonly used in the prior art, so that the consumption of the sea sand is reduced, the density is reduced, the ceramic sand is fully blended into a cementing material formed by cement, fly ash and silica fume, the defects in the concrete are reduced, and the compactness and the overall strength are improved.
In conclusion, the novel light-weight ultrahigh-performance seawater sea sand concrete prepared by the invention has excellent mechanical properties, higher strength and lower density, and is convenient to use in ocean engineering; not only effectively plays the roles of protecting the environment and saving natural resources, but also can enlarge the application range of the seawater-sea sand concrete structure.
It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its emphasis, and where the description in a particular embodiment is not exhaustive, reference may be made to the description in other embodiments.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The light ultra-high performance seawater sea sand concrete is characterized by comprising, by mass, 31.74-36.90 parts of cement, 7.44-8.65 parts of fly ash, 7.84-9.11 parts of silica fume, 5.4-27.35 parts of ceramic sand, 4.70-40.38 parts of sea sand, 4.43-5.53 parts of seawater, 0.74-0.92 part of a water reducing agent and 6.15-7.15 parts of copper-plated steel fibers.
2. The lightweight ultra-high performance seawater sea sand concrete of claim 1, wherein the cement is portland cement.
3. The lightweight ultra-high performance seawater sea sand concrete of claim 1, wherein the fly ash has a specific surface area of 1300m 2 Kg, water demand of 98%, sphere density of 2.32g/cm 3 The fly ash micro-beads with the spherical particle content of 91 percent and the fineness of 18 percent.
4. The lightweight ultra-high performance seawater sea sand concrete of claim 1, wherein the silica fume has a specific surface area of 19500m 2 /kg，SiO 2 The content is 96.75%, the water demand ratio is 125%, the water content is 0.5%, and the burning vector is 3.7%.
5. The lightweight ultra-high performance seawater sea sand concrete as claimed in claim 1, wherein the pottery sand has a crushing grade of 800, comprising coarse pottery sand with a particle size of 2.36-4.75 mm and fine pottery sand with a particle size of 0.075-2.36 mm.
6. The lightweight ultra-high performance seawater sea sand concrete of claim 5, wherein the mass ratio of the coarse pottery sand to the fine pottery sand is 7:3.
7. The lightweight ultra-high performance seawater sea sand concrete of claim 1, wherein the fineness modulus of the sea sand is 2.2.
8. The light-weight ultrahigh-performance seawater sea sand concrete as claimed in claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent, the solid content is 50%, the water reducing rate is 28%, and the mass of the water reducing agent is 2.83% of the total mass of the cement, the fly ash and the silica fume.
9. The lightweight ultra-high performance seawater sea sand concrete of claim 1, wherein the copper-plated steel fibers have an elastic modulus of 80-90 GPa, a nominal length of 13mm, an equivalent diameter of 0.25mm, and a breaking strength of > 2000MPa.
10. The method for preparing the lightweight ultrahigh-performance seawater sea sand concrete as claimed in any one of claims 1 to 9, which is characterized by comprising the following steps:
wetting the pottery sand to saturation for later use;
mixing the seawater and the water reducing agent in proportion;
uniformly stirring cement, fly ash and silica fume, then adding a part of mixed solution of seawater and a water reducing agent, and continuously stirring to obtain gelatinous slurry with certain fluidity;
adding sea sand and wetted pottery sand into the gelatinous slurry, stirring until the sea sand and the pottery sand are fully dissolved into the gelatinous slurry, then adding copper-plated steel fiber and a residual part of mixed solution of seawater and a water reducing agent, and stirring to obtain a concrete material;
and pouring the concrete material into a mold, and performing standard maintenance to obtain the light-weight ultrahigh-performance seawater sea sand concrete.
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| CN115215617A (en) * | 2022-08-15 | 2022-10-21 | 青岛理工大学 | Green low-carbon ultrahigh-performance marine concrete and preparation method and application thereof |
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- 2022-12-01 CN CN202211531300.3A patent/CN115925358A/en active Pending
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|---|---|---|---|---|
| CN107935505A (en) * | 2017-11-30 | 2018-04-20 | 武汉理工大学 | A kind of lightweight lower shrinkage ultra-high performance concrete and preparation method thereof |
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