CN111333392A - Seawater mixed culture coral reef sand C120UHPC and preparation method thereof - Google Patents
Seawater mixed culture coral reef sand C120UHPC and preparation method thereof Download PDFInfo
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- CN111333392A CN111333392A CN201910980577.6A CN201910980577A CN111333392A CN 111333392 A CN111333392 A CN 111333392A CN 201910980577 A CN201910980577 A CN 201910980577A CN 111333392 A CN111333392 A CN 111333392A
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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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
-
- 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
-
- 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
- C04B2111/22—Carbonation resistance
-
- 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
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention discloses seawater mixed culture coral reef sand C120UHPC and a preparation method thereof, wherein the UHPC comprises the following components in parts by weight: ferro-aluminate cement 690.2kg/m3(ii) a 138.6kg/m fine coral reef powder3(ii) a 194.1kg/m of coarse coral reef powder3(ii) a 776.3kg/m quartz sand3(ii) a Silica fume 138.6kg/m3(ii) a Fly ash 34.7kg/m3(ii) a Seawater 182.3kg/m3(ii) a High efficiency water reducing agent 41.6kg/m3(ii) a Steel fiber 140.4kg/m3(ii) a The invention also discloses a preparation method of the UHPC, and the maintenance mode is as follows: placing the concrete test block in a standard curing room, and using wet hempThe cloth covers the test piece or is placed in water, and water spraying and maintenance are carried out for many times in the maintenance process, so that the evaporation of water in concrete is prevented, and the UHPC steam maintenance is avoided by the maintenance method. The invention has the following technical advantages: the method is beneficial to UHPC application and popularization, has important significance for meeting the large-scale engineering construction of the island reef in south China sea, realizing local material utilization, reducing the cost, shortening the construction period and the like, reduces the construction cost of open sea engineering, and also meets the requirements of green, energy-saving and environmental protection of civil engineering.
Description
Technical Field
The invention relates to the technical field of preparation of civil engineering materials, in particular to seawater-mixed coral reef sand C120UHPC and a preparation method thereof.
Background
The offshore island reef in China is far away from the mainland of China, and the shortage of material resources and fresh water resources limits the engineering construction of islands.
Under the condition of lack of material resources and fresh water resources in open sea engineering construction, if the use of the traditional building materials is continued, the marine transportation task is difficult, the transportation cost is overhigh, and the large-scale construction, management and resource development of the open sea in China are severely restricted. And the traditional building materials have poor durability and short service life in the marine climate environment, and seriously restrict the large-scale construction, management and resource development of people to open sea. The ultra-high performance concrete (UHPC) is a novel cement-based composite material with the advantages of ultra-high strength, high toughness, high durability, good volume stability, good impact resistance and the like, and has good mechanical property, durability and good environmental protection performance.
In the offshore island, the island is mainly a coral reef, so that the island needs to be constructed by fully utilizing raw materials around the island, wherein, the coral reef sand fine aggregate is used for mixing the ultra-high performance concrete instead of quartz sand, and marine concrete structures without reinforcing bars, such as a bank protection breakwater and the like, are prepared, so that the restriction of remote marine transportation can be avoided, and the engineering cost can be greatly saved.
Disclosure of Invention
The invention aims to provide the seawater polyculture coral reef powder ultrahigh-performance concrete which is convenient to obtain local materials, low in cost, short in construction period, high in early strength, good in chloride ion permeation resistance, carbonization resistance, corrosion resistance, impact abrasion resistance and the like, more environment-friendly and energy-saving, and the preparation method thereof.
A seawater-mixed coral reef sand C120UHPC comprises: ferrous aluminate cement, fine coral reef powder, coarse coral reef powder, quartz sand, silica fume, fly ash, seawater, a high-efficiency water reducing agent and steel fibers.
Wherein, the concrete comprises the following components in percentage by weight: ferro-aluminate cement 690.2kg/m3(ii) a 138.6kg/m fine coral reef powder3(ii) a 194.1kg/m of coarse coral reef powder3(ii) a 776.3kg/m quartz sand3(ii) a Silica fume 138.6kg/m3(ii) a Fly ash 34.7kg/m3(ii) a Seawater 182.3kg/m3(ii) a High efficiency water reducing agent 41.6kg/m3(ii) a Steel fiber 140.4kg/m3。
The seawater mixed culture coral reef sand C120UHPC is prepared from ferrous aluminate cement and silicon dioxide (SiO) as a chemical component2) 12.4% of alumina (Al)2O3) 26.45%, iron oxide (Fe)2O3)9.50%, calcium oxide (CaO)48.5%, sulfur trioxide (SO)3) 1.46 percent and 0.15 percent of loss on ignition.
The fine coral reef powder and the coarse coral reef powder are both natural original shapes or are prepared by grinding and screening crushed coral reefs through a ball mill, wherein: the particle size of the fine coral reef powder is 1000 meshes, and the particle size of the coarse coral reef powder is 20-70 meshes.
The quartz sand is milk white, and the chemical component of the quartz sand is silicon dioxide (SiO)2) 99.5-99.9% of content, and carbon sesquioxide (Fe)2O3) The content is less than 0.005 percent, and the particle size is 0.45-0.85 mm.
The silica fume is gray black, and the chemical component of the silica fume is silicon dioxide (SiO)2) 94.5-96% of magnesium oxide (MgO), 0.97% of magnesia and Fe oxide2O3) The content is 0.83%, and the specific surface area is 23000m2Per kg, specific gravity 2400kg/m3Particle size of 0.05
。
The fly ash is offwhite and contains chemical component of silicon dioxide (SiO)2) 60.98% of aluminum oxide (Al)2O3) 24.47% of carbon sesquioxide (Fe)2O3) 6.7 percent of calcium oxide (CaO), 5.1 percent of magnesium oxide (MgO), and 8 percent of particle size
。
The high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent produced by basf (China) limited company, the water reducing agent is a liquid water reducing agent, and the steel fiber is a straight copper-plated steel fiber, the length of the steel fiber is 12-14 mm, and the diameter of the steel fiber is 0.21-0.23 mm.
The seawater mixed culture coral reef sand C120UHPC has the concrete compressive strength of 30MPa in 1 day, 58MPa in 3 days, 88MPa in 7 days, 122MPa in 28 days, 15.5MPa in 28 days, 6.98MPa in 28 days and 211mm in expansion degree.
A preparation method of seawater mixed culture coral reef sand C120UHPC comprises the following steps:
step 1: weighing specific amounts of quartz sand, fine coral reef powder and coarse coral reef powder according to the proportion, placing the weighed materials in a stirrer, and stirring for not less than 5min under a low-speed condition;
step 2: adding specific amounts of cement, silica fume and fly ash according to the proportion, placing the mixture into a stirrer, and stirring for not less than 5min under a low-speed condition;
and step 3: weighing specific amount of water and a high efficiency water reducing agent according to the proportion, mixing and stirring the water and the high efficiency water reducing agent uniformly, adding the mixture into a stirrer, stirring at a low speed for 2min, and then stirring at a high speed for 5min until the stirred material is fluidized;
and 4, step 4: after the step 3 is finished, weighing a specific amount of steel fibers according to the proportion, slowly adding the steel fibers into the stirred material, and continuing to stir at a high speed for 10min after the addition is finished;
and 5: after the step 4 is finished, slowly pouring the mixed concrete into a mould, lightly beating the two sides of the mould for 20 times by using a small hammer, and then placing the mould in a standard curing chamber for curing for 1 day;
step 6: and (5) after the step 5 is finished, removing the formwork for maintenance, and obtaining the seawater-mixed coral reef sand C120UHPC after the maintenance is finished.
The preparation method of the seawater mixed culture coral reef sand C120UHPC is characterized by comprising the following steps of: in step 6, the concrete may be cured by: 1) placing the concrete in a standard curing room, covering the test piece with wet linen, and performing high-frequency intermittent watering treatment to keep the linen in a wet state all the time; 2) and placing the test piece in water for curing, and ensuring that the temperature in the water is 20 ℃.
The invention has the following beneficial effects:
firstly, the concrete is mixed by adopting seawater and coral reef powder, so that local materials are conveniently obtained, and the transportation cost is reduced.
And secondly, stirring UHPC (ultra high temperature polycarbonate) by adopting seawater and the ferro-aluminate cement to ensure that the early strength of the concrete is high, wherein the early strength of the concrete reaches 30MPa in 1 day, and the damage of rising tide of buildings on an island due to low early strength is avoided, the UHPC is a novel cement-based composite material with the advantages of ultrahigh strength, high toughness, high durability, good volume stability, good impact resistance and the like, and has good mechanical property and durability, wherein the 28-day compressive strength of the UHPC is 122MPa, the 28-day flexural strength of the UHPC is 15.5MPa, and the 28-day tensile strength of the UHPC is 6.98MPa, and meanwhile, the UHPC also has good environmental protection performance.
Thirdly, the coral reef sand has the characteristics of rapid early water absorption and slow later stage, so that the coral reef generates water return, the internal maintenance is reduced, and the durability of concrete is provided.
And fourthly, the coral reef powder with different particle sizes is completely replaced by quartz powder in the ultra-high performance concrete, coarse aggregate quartz sand in the concrete is partially replaced, the quartz powder is replaced, the consumption of the quartz sand is reduced, the exploitation and utilization of natural resources are reduced in the environment, the purposes of energy conservation and emission reduction are achieved, the coral reef sand piling and occupation area is reduced, and the consumption of natural materials is reduced.
Based on the maximum packing density theory, coral reef powder with different particle sizes is added to fill gaps among concrete, so that the concrete structure becomes more compact, the packing density of the ultra-high performance concrete particles is optimized, the gaps among the components are fully packed, and the strength and durability of the ultra-high performance concrete are ensured; the invention also adopts the fly ash to replace part of the silica fume, and the fine coral reef powder replaces 10% of the cement, thereby reducing the production cost of the ultra-high performance concrete, being economic and environment-friendly, and the doping of the fly ash can ensure the later strength of the concrete, and the surface of the micro-particles of the fly ash is smooth, thus greatly improving the fluidity of the concrete.
Sixthly, under the action of the high-efficiency water reducing agent, the water-cement ratio of the concrete is continuously optimized, so that the concrete prepared by stirring has certain fluidity, the pumping of the concrete is more convenient, vibration is not needed in the pouring process, the gas in the slurry is discharged by the concrete under the action of self weight, and the concrete achieves the effect of natural compaction; the seawater mixed and cured concrete prepared by the method does not need steam or high-temperature curing, but covers the concrete test block by using the wet linen, and is cured by high-frequency intermittent sprinkling, so that the linen is ensured to be in a wet state or is cured in water.
Detailed Description
The present invention will be described in further detail with reference to examples, but is not limited thereto.
A seawater-mixed coral reef sand C120UHPC comprises: ferrous aluminate cement, fine coral reef powder, coarse coral reef powder, quartz sand, silica fume, fly ash, seawater, a high-efficiency water reducing agent and steel fibers.
Wherein, the concrete comprises the following components in percentage by weight: ferro-aluminate cement 690.2kg/m3(ii) a 138.6kg/m fine coral reef powder3(ii) a 194.1kg/m of coarse coral reef powder3(ii) a 776.3kg/m quartz sand3(ii) a Silica fume 138.6kg/m3(ii) a Fly ash 34.7kg/m3(ii) a Seawater 182.3kg/m3(ii) a High efficiency water reducing agent 41.6kg/m3(ii) a Steel fiber 140.4kg/m3。
The seawater mixed culture coral reef sand C120UHPC is prepared by mixing cement with ironAluminate cement whose chemical composition is silicon dioxide (SiO)2) 12.4% of alumina (Al)2O3) 26.45%, iron oxide (Fe)2O3)9.50%, calcium oxide (CaO)48.5%, sulfur trioxide (SO)3) 1.46 percent and 0.15 percent of loss on ignition.
The fine coral reef powder and the coarse coral reef powder are both natural original shapes or are prepared by grinding and screening crushed coral reefs through a ball mill, wherein: the particle size of the fine coral reef powder is 1000 meshes, and the particle size of the coarse coral reef powder is 20-70 meshes.
The quartz sand is milk white, and the chemical component of the quartz sand is silicon dioxide (SiO)2) 99.5-99.9% of content, and carbon sesquioxide (Fe)2O3) The content is less than 0.005 percent, and the particle size is 0.45-0.85 mm.
The silica fume is gray black, and the chemical component of the silica fume is silicon dioxide (SiO)2) 94.5-96% of magnesium oxide (MgO), 0.97% of magnesia and Fe oxide2O3) The content is 0.83%, and the specific surface area is 23000m2Per kg, specific gravity 2400kg/m3Particle size of 0.05
。
The fly ash is offwhite and contains chemical component of silicon dioxide (SiO)2) 60.98% of aluminum oxide (Al)2O3) 24.47% of carbon sesquioxide (Fe)2O3) 6.7 percent of calcium oxide (CaO), 5.1 percent of magnesium oxide (MgO), and 8 percent of particle size
。
The high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent produced by basf (China) limited company, the water reducing agent is a liquid water reducing agent, and the steel fiber is a straight copper-plated steel fiber, the length of the steel fiber is 12-14 mm, and the diameter of the steel fiber is 0.21-0.23 mm.
According to the seawater mixed culture coral reef sand C120UHPC, the 1-day compressive strength of the concrete is 30MPa, the 3-day compressive strength is 58MPa, the 7-day compressive strength is 88MPa, the 28-day compressive strength is 122MPa, the 28-day flexural strength is 15.5MPa, the 28-day tensile strength is 6.98MPa, and the expansion degree is 211 mm;
a preparation method of seawater mixed culture coral reef sand C120UHPC comprises the following steps:
step 1: weighing specific amounts of quartz sand, fine coral reef powder and coarse coral reef powder according to the proportion, placing the weighed materials in a stirrer, and stirring for not less than 5min under a low-speed condition;
step 2: adding specific amounts of cement, silica fume and fly ash according to the proportion, placing the mixture into a stirrer, and stirring for not less than 5min under a low-speed condition;
and step 3: weighing specific amount of water and a high efficiency water reducing agent according to the proportion, mixing and stirring the water and the high efficiency water reducing agent uniformly, adding the mixture into a stirrer, stirring at a low speed for 2min, and then stirring at a high speed for 5min until the stirred material is fluidized;
and 4, step 4: after the step 3 is finished, weighing a specific amount of steel fibers according to the proportion, slowly adding the steel fibers into the stirred material, and continuing to stir at a high speed for 10min after the addition is finished;
and 5: after the step 4 is finished, slowly pouring the mixed concrete into a mould, lightly beating the two sides of the mould for 20 times by using a small hammer, and then placing the mould in a standard curing chamber for curing for 1 day;
step 6: and (5) after the step 5 is finished, removing the formwork for maintenance, and obtaining the seawater-mixed coral reef sand C120UHPC after the maintenance is finished.
The preparation method of the seawater mixed culture coral reef sand C120UHPC is characterized by comprising the following steps of: in step 6, the concrete may be cured by: 1) placing the concrete in a standard curing room, covering the test piece with wet linen, and performing high-frequency intermittent watering treatment to keep the linen in a wet state all the time; 2) and placing the test piece in water for curing, and ensuring that the temperature in the water is 20 ℃.
Claims (10)
1. A seawater mixed culture coral reef sand C120UHPC is characterized in that: the method comprises the following steps: ferrous aluminate cement, fine coral reef powder, coarse coral reef powder, quartz sand, silica fume, fly ash, seawater, high-efficiency water reducing agent and steel fiber(ii) a Wherein, the concrete comprises the following components in percentage by weight: ferro-aluminate cement 690.2kg/m3(ii) a 138.6kg/m fine coral reef powder3(ii) a 194.1kg/m of coarse coral reef powder3(ii) a 776.3kg/m quartz sand3(ii) a Silica fume 138.6kg/m3(ii) a Fly ash 34.7kg/m3(ii) a Seawater 182.3kg/m3(ii) a High efficiency water reducing agent 41.6kg/m3(ii) a Steel fiber 140.4kg/m3。
2. The seawater-mixed coral reef sand C150UHPC and the preparation method thereof as claimed in claim 1, wherein the seawater-mixed coral reef sand C150UHPC comprises the following steps: the cement is ferrous aluminate cement, and the chemical component of the cement is silicon dioxide (SiO)2) 12.4% of alumina (Al)2O3) 26.45%, iron oxide (Fe)2O3)9.50%, calcium oxide (CaO)48.5%, sulfur trioxide (SO)3) 1.46 percent and 0.15 percent of loss on ignition.
3. The seawater-polycultured coral reef sand C120UHPC as claimed in claim 1, wherein: the fine coral reef powder and the coarse coral reef powder are both natural original shapes or are prepared by grinding and screening crushed coral reefs through a ball mill, wherein: the particle size of the fine coral reef powder is 1000 meshes, and the particle size of the coarse coral reef powder is 20-70 meshes.
4. The seawater-polycultured coral reef sand C120UHPC as claimed in claim 1, wherein: the quartz sand is milk white, and the chemical component of the quartz sand is silicon dioxide (SiO)2) 99.5-99.9% of content, and carbon sesquioxide (Fe)2O3) The content is less than 0.005 percent, and the particle size is 0.45-0.85 mm.
5. The seawater-polycultured coral reef sand C120UHPC as claimed in claim 1, wherein: the silica fume is gray black, and the chemical component of the silica fume is silicon dioxide (SiO)2) 94.5-96% of magnesium oxide (MgO), 0.97% of magnesia and Fe oxide2O3) The content is 0.83%, and the specific surface area is 23000m2Per kg, specific gravity 2400kg/m3Particle size of 0.05
。
6. The seawater-polycultured coral reef sand C120UHPC as claimed in claim 1, wherein: the fly ash is offwhite and the chemical component of the fly ash is silicon dioxide (SiO)2) 60.98% of aluminum oxide (Al)2O3) 24.47% of carbon sesquioxide (Fe)2O3) 6.7 percent of calcium oxide (CaO), 5.1 percent of magnesium oxide (MgO), and 8 percent of particle size
。
7. The seawater-mixedly-cultured mixed coral reef sand C120UHPC as claimed in claim 1, wherein: the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent produced by basf (China) limited company, the water reducing agent is a liquid water reducing agent, and the steel fiber is a straight copper-plated steel fiber, the length of the steel fiber is 12-14 mm, and the diameter of the steel fiber is 0.21-0.23 mm.
8. The seawater-polycultured coral reef sand C120UHPC as claimed in claim 1, wherein: the concrete has the compression strength of 30MPa in 1 day, 58MPa in 3 days, 88MPa in 7 days, 122MPa in 28 days, 15.5MPa in 28 days, 6.98MPa in 28 days and 211mm in expansion degree.
9. A preparation method of seawater mixed culture coral reef sand C120UHPC is characterized in that: the stirring method comprises the following steps:
step 1: weighing specific amounts of quartz sand, fine coral reef powder and coarse coral reef powder according to the proportion, placing the weighed materials in a stirrer, and stirring for not less than 5min under a low-speed condition;
step 2: adding specific amounts of cement, silica fume and fly ash according to the proportion, placing the mixture into a stirrer, and stirring for not less than 5min under a low-speed condition;
and step 3: weighing specific amount of water and a high efficiency water reducing agent according to the proportion, mixing and stirring the water and the high efficiency water reducing agent uniformly, adding the mixture into a stirrer, stirring at a low speed for 2min, and then stirring at a high speed for 5min until the stirred material is fluidized;
and 4, step 4: after the step 3 is finished, weighing a specific amount of steel fibers according to the proportion, slowly adding the steel fibers into the stirred material, and continuing to stir at a high speed for 10min after the addition is finished;
and 5: after the step 4 is finished, slowly pouring the mixed concrete into a mould, lightly beating the two sides of the mould for 20 times by using a small hammer, and then placing the mould in a standard curing chamber for curing for 1 day;
step 6: and (5) after the step 5 is finished, removing the formwork for maintenance, and obtaining the seawater-mixed coral reef sand C120UHPC after the maintenance is finished.
10. The method for preparing seawater-mixed coral reef sand C120UHPC according to claim 9, which is characterized in that: in step 6, the concrete may be cured by: 1) placing the concrete in a standard curing room, covering the test piece with wet linen, and performing high-frequency intermittent watering treatment to keep the linen in a wet state all the time; 2) and placing the test piece in water for curing, and ensuring that the temperature in the water is 20 ℃.
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| CN112592125A (en) * | 2020-12-16 | 2021-04-02 | 中交公路长大桥建设国家工程研究中心有限公司 | Self-compacting coral lightweight concrete and preparation method thereof |
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| CN111997391B (en) * | 2020-07-15 | 2022-03-15 | 中冶建筑研究总院有限公司 | Concrete shrinkage cracking composite regulation and control system and regulation and control method thereof |
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