CN111960755A - Fine concrete with dredged sand as main raw material and preparation method thereof - Google Patents

Fine concrete with dredged sand as main raw material and preparation method thereof Download PDF

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Publication number
CN111960755A
CN111960755A CN202010673684.7A CN202010673684A CN111960755A CN 111960755 A CN111960755 A CN 111960755A CN 202010673684 A CN202010673684 A CN 202010673684A CN 111960755 A CN111960755 A CN 111960755A
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China
Prior art keywords
dredged sand
raw material
fine concrete
main raw
cement
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CN202010673684.7A
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Inventor
江朝华
张玮
覃昌佩
刘大智
周凯
柴星宇
王锌鑫
汤晨军
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Hohai University HHU
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Hohai University HHU
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Priority to CN202010673684.7A priority Critical patent/CN111960755A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention discloses a fine concrete taking dredged sand as a main raw material, which comprises cement, dredged sand, limestone powder, regenerated glass powder, a high-efficiency water reducing agent and water. The invention also discloses a preparation method of the fine concrete taking the dredged sand as the main raw material, which comprises the following steps: s01, adding the dredged sand, the cement, the limestone powder and the regenerated glass powder into a stirrer according to the raw material proportion, and dry-stirring for 1-2 minutes until the materials are uniformly mixed; s02, adding a polycarboxylic acid high-efficiency water reducing agent and water by a post-mixing method, and wet-mixing until the mixture is uniformly mixed; s03, adding the uniformly mixed materials into a test mold layer by layer, vibrating the materials added into the test mold 1/2 for 30S on a vibrating table, and then vibrating the materials while adding the materials; and S04, covering a film on the surface of the test mold after molding, demolding after 12-24 hours, and curing the test piece to a specified age under standard conditions after demolding to obtain the dredged sand fine concrete. The invention provides fine concrete taking dredged sand as a main raw material and a preparation method thereof, and the fine concrete can be processed into building materials by reasonably utilizing the dredged sand.

Description

Fine concrete with dredged sand as main raw material and preparation method thereof
Technical Field
The invention relates to fine concrete taking dredged sand as a main raw material and a preparation method thereof, belonging to the technical field of waste utilization and new materials.
Background
In recent years, the Yangtze river remediation brings a great deal of dredging waste sandy soil, and if the waste sandy soil is used as waste for external throwing treatment, the waste sandy soil not only occupies a great deal of land, but also causes secondary pollution to the surrounding environment and water resources, and causes huge waste of resources. The method reasonably disposes and utilizes the waste dredged soil, not only can reduce the influence on the environment, but also can increase a large amount of land resources, and is a way for the water transportation industry to insist on the basic national policy of saving resources and protecting the environment and insist on the green, low-carbon, cyclic and sustainable development. If the waste soil resources of the channel engineering are prepared into hydraulic materials and building materials through the solidification technology, the method is applied to channel improvement engineering and urban construction nearby, the land occupation is reduced while the waste soil is prevented from being transported, the engineering cost is reduced, the problem of secondary pollution of solid wastes is solved, and the influence of the channel improvement engineering on the environment is relieved. In the prior art, a scheme for preparing building materials by reasonably disposing and utilizing waste dredged soil is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a fine concrete which can be processed into building materials by reasonably utilizing dredged sand and takes the dredged sand as a main raw material and a preparation method thereof.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a fine concrete with dredged sand as main raw material is prepared from cement, dredged sand, limestone powder, regenerated glass powder, efficient water-reducing agent and water. The fine concrete is the same as common concrete in main composition and components, and consists of cement, coarse aggregate, fine aggregate, water and additives, and can replace common concrete for use, wherein dredged sand replaces the coarse aggregate in the common concrete, limestone powder and glass powder are mixed as fillers to replace the fine aggregate in the common concrete, the cement is a cementing material, and a high-efficiency water reducing agent must be added to reduce water consumption and increase the fluidity of the cement.
The proportion of each raw material is as follows: dredged sand 1200-1500 kg/m3(ii) a 250-400 kg/m cement3(ii) a 60-100 kg/m limestone powder3(ii) a 60-100 kg/m of regenerated glass powder3(ii) a 3.5-6.5 kg/m of high-efficiency water reducing agent3(ii) a 150-240 kg/m water3. The density of the fine concrete is 000 to 2200kg/m3
The dredged sand comprises the following main chemical components: SiO 22、Al2O3、Fe2O3、CaO、 MgO、K2O、Na2O、TiO2And SO3(ii) a The fineness modulus of the dredged sand is 0.1-0.75, and the density is 1.2-1.8 g/cm3The diameter of the particles is less than 0.3mm, and the mud content is less than 20 percent.
CaCO in the limestone powder3Content (wt.)>93% by weight, and the specific gravity is 2.4-2.9 kg/m3The particle diameter is less than 80 mu m, and the specific surface area is 300-600 m2In terms of/kg. The concrete has extremely high pozzolanic activity, has double functions in fine concrete, one is used as a part of aggregate to be used as filler to fill holes among sand grains so as to play a role in enhancing, and the other is used for playing a pozzolanic role in a mixing ratio so as to improve the material performance.
The diameter of the regenerated glass powder particles is less than 80 mu m, and the specific surface area is 300-800 m2Kg, specific gravity of 2.4-2.7 kg/m3Aims to lead the prepared concrete to form compact and piled particles through the filling effect of glass powder fine particles and good and reasonable particle grading, and improve the working performance, the mechanical property and the like of the dredged sand fine particle concrete.
The cement is P.O 42.5 ordinary portland cement, the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the water-cement ratio is reduced by adding the water reducing agent, and the workability is improved.
A preparation method of fine concrete taking dredged sand as a main raw material comprises the following steps:
s01, adding the dredged sand, the cement, the limestone powder and the regenerated glass powder into a stirrer according to the raw material proportion, and dry-stirring for 1-2 minutes until the materials are uniformly mixed;
s02, adding a polycarboxylic acid high-efficiency water reducing agent and water by a post-mixing method to improve the adaptability of cement, and wet-mixing until the mixture is uniformly mixed;
s03, adding the uniformly mixed materials into a test mold layer by layer, vibrating the materials added into the test mold 1/2 for 30S on a vibrating table, adding the materials while vibrating, and controlling the vibration forming time to be about 2 minutes;
and S04, covering a film on the surface of the test mold after molding, demolding after 12-24 hours, and curing the test piece to a specified age under standard conditions after demolding to obtain the dredged sand fine concrete.
1. The invention has the beneficial effects that: the invention provides a fine concrete using dredged sand as main raw material and a preparation method thereof, the fine concrete and common concrete mainly comprise the same components and are composed of cement, coarse aggregate, fine aggregate, water and additives and can be used for replacing common concrete, wherein the dredged sand replaces the coarse aggregate in the common concrete, limestone powder and glass powder are mixed as filler for replacing the fine aggregate in the common concrete, the cement is a gelled material, and meanwhile, a high-efficiency water reducing agent is required to be added for reducing water consumption and increasing the fluidity of the cement. Based on the obtained reasonable and good particle composition and the physical and chemical double effects of cement hydration, the novel concrete taking the dredged sand as the main raw material is prepared. The limestone powder can be prepared by screening waste limestone materials generated in the preparation process of local machine-made sand, the gradation can be better adjusted by adding a small amount of limestone micro powder, and meanwhile, the limestone powder has certain hydration activity, so that the obtained concrete has higher compressive strength and better impermeability. The regenerated glass powder can be obtained by grinding waste glass to a certain fineness.
The dredged sand is taken as a main raw material, and a novel coarse aggregate-free dredged sand fine concrete material is prepared to replace common concrete to manufacture a facing brick or a ballast block of a soft body row and the like for local use, so that on one hand, a large amount of wastes such as dredged waste sand, waste limestone, waste glass and the like can be utilized, the land occupation is reduced, the problem of secondary pollution of solid wastes is solved, and the influence of channel treatment engineering and the like on the environment is relieved; on the other hand, the cement consumption can be reduced, the construction cost is reduced, and the method has wide application prospect and good ecological benefit.
Detailed Description
The present invention is further described below, and the following examples are only used to more clearly illustrate the technical solutions of the present invention, but not to limit the scope of the present invention.
Detailed description of the preferred embodiment 1
The invention discloses a fine concrete taking dredged sand as a main raw material, which comprises cement, dredged sand, limestone powder, glass powder, a high-efficiency water reducing agent and water. The density of the fine concrete is 2000-2200 kg/m3The raw materials are in proportion as follows: dredged sand 1200-1500 kg/m3(ii) a 250-400 kg/m cement3(ii) a 60-100 kg/m limestone powder3(ii) a 60-100 kg/m of glass powder3(ii) a 3.5-6.5 kg/m of high-efficiency water reducing agent3(ii) a 150-240 kg/m water3
The dredged sand comprises the following main chemical components: SiO 22、Al2O3、Fe2O3、CaO、 MgO、K2O、Na2O、TiO2And SO3(ii) a The fineness modulus of the dredged sand is 0.1-0.75, and the density is 1.2-1.8 g/cm3(ii) a The diameter of the particles is less than 0.6mm, the mud content is less than 20 percent, and the mud block content is 5 percent.
CaCO in limestone powder3Content (wt.)>93% by weight, and a specific gravity of 2.4 to 2.9kg/m3The particle diameter is less than 80 mu m, and the specific surface area is 300-600 m2In terms of/kg. The limestone powder has double functions in fine concrete, namely, the limestone powder serves as partial aggregate as filler to fill holes among sand grains so as to play a role in reinforcement, and the limestone powder serves as volcanic ash in a mixing ratioSo as to improve the material performance.
The glass powder has the particle diameter of less than 80 microns and the specific surface area of 300-800 m2In terms of/kg. Specific gravity of 2.4-2.7 kg/m3The concrete has extremely high volcanic ash activity, aims to lead the prepared concrete to form compact and piled particles through the filling effect of glass powder fine particles and good and reasonable particle grading, and improves the working performance, the mechanical property and the like of the dredged sand fine concrete.
The cement is P.O 42.5 ordinary portland cement; the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the water-gel ratio is reduced by adding the water reducing agent, and the workability is improved.
The invention relates to a preparation method of fine concrete by taking dredged sand as a main raw material, which specifically comprises the following steps;
step one, weighing 250kg/m of cement3Dredged sand 1500kg/m3100kg/m limestone powder3100kg/m of glass powder3And adding the mixture into a stirrer to be dry-stirred for 1min until the mixture is uniformly mixed.
Secondly, adding 3.75kg/m of polycarboxylic acid high-efficiency water reducing agent by a post-mixing method3And 150kg/m of water3And firstly, wet-mixing water and materials for 30 seconds, and then adding a water reducing agent for wet-mixing for 60 seconds until the materials are uniformly mixed.
And step three, filling the uniformly mixed material into a forming die (namely a test die) with the size of 150 multiplied by 150mm, placing the test die on a concrete vibrating table to vibrate for 30 seconds after adding 1/2 material, then adding the material while vibrating, and keeping the total vibration time less than 2 minutes.
And step four, covering a film on the surface of the test mold after molding, demolding after 12-24 hours, and curing the test piece to a specified age under standard conditions after demolding to obtain the fine concrete (I) based on the dredged sand.
The compressive strength of a test piece is detected according to concrete strength inspection and evaluation standards (GBT _50107-2010), the compressive strength of the dredged sand fine concrete without coarse aggregates is 31.0MPa in 28 days, exceeds 30MPa, and the splitting tensile strength is 3.2MPa, so that the dredged sand fine concrete can be used for replacing common concrete to prepare ballast blocks or facing bricks and is applied to the hydraulic field.
Specific example 2
The invention discloses a fine concrete taking dredged sand as a main raw material, which comprises cement, dredged sand, limestone powder, glass powder, a high-efficiency water reducing agent and water. The density of the fine concrete is 2000-2200 kg/m3The raw materials are in proportion as follows: dredged sand 1200-1500 kg/m3(ii) a 250-400 kg/m cement3(ii) a 60-100 kg/m limestone powder3(ii) a 60-100 kg/m of glass powder3(ii) a 3.5-6.5 kg/m of high-efficiency water reducing agent3(ii) a 150-240 kg/m water3
The dredged sand comprises the following main chemical components: SiO 22、Al2O3、Fe2O3、CaO、 MgO、K2O、Na2O、TiO2And SO3(ii) a The fineness modulus of the dredged sand is 0.1-0.75, and the density is 1.2-1.8 g/cm3(ii) a The diameter of the particles is less than 0.6mm, the mud content is less than 20 percent, and the mud block content is 5 percent.
CaCO in limestone powder3Content (wt.)>93% by weight, and a specific gravity of 2.4 to 2.9kg/m3The particle diameter is less than 80 mu m, and the specific surface area is 300-600 m2In terms of/kg. The limestone powder has double functions in the fine concrete, wherein one function is as partial aggregate to be used as filler to fill holes among sand grains so as to play a role in reinforcement, and the other function is play a role in volcanic ash in the mixing ratio so as to improve the material performance.
The glass powder has the particle diameter of less than 80 microns and the specific surface area of 300-800 m2In terms of/kg. Specific gravity of 2.4-2.7 kg/m3The concrete has extremely high volcanic ash activity, aims to lead the prepared concrete to form compact and piled particles through the filling effect of glass powder fine particles and good and reasonable particle grading, and improves the working performance, the mechanical property and the like of the dredged sand fine concrete.
The cement is P.O 42.5 ordinary portland cement; the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the water-gel ratio is reduced by adding the water reducing agent, and the workability is improved.
The invention relates to a preparation method of fine concrete by taking dredged sand as a main raw material, which specifically comprises the following steps;
step one, weighing 400kg/m of cement31370kg/m of dredged sand365kg/m limestone powder365kg/m of glass powder3And adding the mixture into a stirrer to be dry-stirred for 1min until the mixture is uniformly mixed.
Secondly, adding 6.0kg/m of polycarboxylic acid high-efficiency water reducing agent by a post-mixing method3And water 200kg/m3And firstly, wet-mixing water and materials for 30 seconds, and then adding a water reducing agent for wet-mixing for 60 seconds until the materials are uniformly mixed.
And step three, filling the uniformly mixed material into a forming die (namely a test die) with the size of 150 multiplied by 150mm, placing the test die on a concrete vibrating table to vibrate for 30 seconds after adding 1/2 material, then adding the material while vibrating, and keeping the total vibration time less than 2 minutes.
And step four, covering a film on the surface of the test mold after molding, demolding after 12-24 hours, and curing the test piece to a specified age under standard conditions after demolding to obtain the fine concrete (I) based on the dredged sand.
And (3) detecting the compressive strength of a test piece (II) according to concrete strength test evaluation standard (GBT-50107-2010), wherein the compressive strength of the waste extra-fine sand test piece (II) is 36.4MPa after 28 days, exceeds 30MPa, and the splitting tensile strength is 3.4MPa, so that the requirement on the strength of the high-strength mortar is met.
Specific example 3
The invention discloses a fine concrete taking dredged sand as a main raw material, which comprises cement, dredged sand, limestone powder, glass powder, a high-efficiency water reducing agent and water. The density of the fine concrete is 2000-2200 kg/m3The raw materials are in proportion as follows: dredged sand 1200-1500 kg/m3(ii) a 250-400 kg/m cement3(ii) a 60-100 kg/m limestone powder3(ii) a 60-100 kg/m of glass powder3(ii) a 3.5-6.5 kg/m of high-efficiency water reducing agent3(ii) a 150-240 kg/m water3
The dredged sand comprises the following main chemical components: SiO 22、Al2O3、Fe2O3、CaO、 MgO、K2O、Na2O、TiO2And SO3(ii) a The fineness modulus of the dredged sand is between 0.1 and 0.75, and the density is 1.2 to 1.8 g/mlcm3(ii) a The diameter of the particles is less than 0.6mm, the mud content is less than 20 percent, and the mud block content is 5 percent.
CaCO in limestone powder3Content (wt.)>93% by weight, and a specific gravity of 2.4 to 2.9kg/m3The particle diameter is less than 80 mu m, and the specific surface area is 300-600 m2In terms of/kg. The limestone powder has double functions in the fine concrete, wherein one function is as partial aggregate to be used as filler to fill holes among sand grains so as to play a role in reinforcement, and the other function is play a role in volcanic ash in the mixing ratio so as to improve the material performance.
The glass powder has the particle diameter of less than 80 microns and the specific surface area of 300-800 m2In terms of/kg. Specific gravity of 2.4-2.7 kg/m3The concrete has extremely high volcanic ash activity, aims to lead the prepared concrete to form compact and piled particles through the filling effect of glass powder fine particles and good and reasonable particle grading, and improves the working performance, the mechanical property and the like of the dredged sand fine concrete.
The cement is P.O 42.5 ordinary portland cement; the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the water-gel ratio is reduced by adding the water reducing agent, and the workability is improved.
The invention relates to a preparation method of fine concrete by taking dredged sand as a main raw material, which specifically comprises the following steps;
step one, weighing 350kg/m of cement3Dredging sand 1424kg/m375kg/m limestone powder375kg/m of glass powder3And adding the mixture into a stirrer to be dry-stirred for 1min until the mixture is uniformly mixed.
Secondly, adding 5.2kg/m of polycarboxylic acid high-efficiency water reducing agent by a post-mixing method3And water 176 kg/m3And firstly, wet-mixing water and materials for 30 seconds, and then adding a water reducing agent for wet-mixing for 60 seconds until the materials are uniformly mixed.
And step three, filling the uniformly mixed material into a forming die (namely a test die) with the size of 150 multiplied by 150mm, placing the test die on a concrete vibrating table to vibrate for 30 seconds after adding 1/2 material, then adding the material while vibrating, and keeping the total vibration time less than 2 minutes.
And step four, covering a film on the surface of the test mold after molding, demolding after 12-24 hours, and curing the test piece to a specified age under standard conditions after demolding to obtain the fine concrete (I) based on the dredged sand.
And (3) detecting the compressive strength of the test piece (c) according to concrete strength inspection and evaluation standard (GBT _50107-2010), wherein the compressive strength of the waste extra-fine sand test piece (c) for 28 days is 43.1MPa and exceeds 4.2MPa, and the splitting tensile strength is 3.7MPa, so that the requirement of high-strength mortar strength is met.
Specific example 4
The invention discloses a fine concrete taking dredged sand as a main raw material, which comprises cement, dredged sand, limestone powder, glass powder, a high-efficiency water reducing agent and water. The density of the fine concrete is 2000-2200 kg/m3The raw materials are in proportion as follows: dredged sand 1200-1500 kg/m3(ii) a 250-400 kg/m cement3(ii) a 60-100 kg/m limestone powder3(ii) a 60-100 kg/m of glass powder3(ii) a 3.5-6.5 kg/m of high-efficiency water reducing agent3(ii) a 150-240 kg/m water3
The dredged sand comprises the following main chemical components: SiO 22、Al2O3、Fe2O3、CaO、 MgO、K2O、Na2O、TiO2And SO3(ii) a The fineness modulus of the dredged sand is 0.1-0.75, and the density is 1.2-1.8 g/cm3(ii) a The diameter of the particles is less than 0.6mm, the mud content is less than 20 percent, and the mud block content is 5 percent.
CaCO in limestone powder3Content (wt.)>93% by weight, and a specific gravity of 2.4 to 2.9kg/m3The particle diameter is less than 80 mu m, and the specific surface area is 300-600 m2In terms of/kg. The limestone powder has double functions in the fine concrete, wherein one function is as partial aggregate to be used as filler to fill holes among sand grains so as to play a role in reinforcement, and the other function is play a role in volcanic ash in the mixing ratio so as to improve the material performance.
The glass powder has the particle diameter of less than 80 microns and the specific surface area of 300-800 m2In terms of/kg. Specific gravity of 2.4-2.7 kg/m3Has extremely high volcanic ash activity, aims to lead the prepared concrete composition particles to be compactly stacked through the filling effect of glass powder fine particles and good and reasonable particle grading, and improves the working performance and the force of dredged sand fine-particle concreteChemical properties, etc.
The cement is P.O 42.5 ordinary portland cement; the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the water-gel ratio is reduced by adding the water reducing agent, and the workability is improved.
The invention relates to a preparation method of fine concrete by taking dredged sand as a main raw material, which specifically comprises the following steps;
step one, weighing 300kg/m of cement3The dredging sand is 1478kg/m3Limestone powder 85kg/m385kg/m of glass powder3And adding the mixture into a stirrer to be dry-stirred for 1min until the mixture is uniformly mixed.
Secondly, adding 4.5kg/m of polycarboxylic acid high-efficiency water reducing agent by a post-mixing method3And 150kg/m of water3And firstly, wet-mixing water and materials for 30 seconds, and then adding a water reducing agent for wet-mixing for 60 seconds until the materials are uniformly mixed.
And step three, filling the uniformly mixed material into a forming die (namely a test die) with the size of 150 multiplied by 150mm, placing the test die on a concrete vibrating table to vibrate for 30 seconds after adding 1/2 material, then adding the material while vibrating, and keeping the total vibration time less than 2 minutes.
And step four, covering a film on the surface of the test mold after molding, demolding after 12-24 hours, and curing the test piece to a specified age under standard conditions after demolding to obtain the fine concrete (I) based on the dredged sand.
And (3) detecting the compressive strength of the test piece (IV) according to the concrete strength test evaluation standard (GBT _ 50107-.
Specific example 5
The invention discloses a fine concrete taking dredged sand as a main raw material, which comprises cement, dredged sand, limestone powder, glass powder, a high-efficiency water reducing agent and water. The density of the fine concrete is 2000-2200 kg/m3The raw materials are in proportion as follows: dredged sand 1200-1500 kg/m3(ii) a 250-400 kg/m cement3(ii) a 60-100 kg/m limestone powder3(ii) a 60-100 kg/m of glass powder3(ii) a 3.5-6.5 kg/m of high-efficiency water reducing agent3(ii) a 150-240 kg/m water3
The dredged sand comprises the following main chemical components: SiO 22、Al2O3、Fe2O3、CaO、 MgO、K2O、Na2O、TiO2And SO3(ii) a The fineness modulus of the dredged sand is 0.1-0.75, and the density is 1.2-1.8 g/cm3(ii) a The diameter of the particles is less than 0.6mm, the mud content is less than 20 percent, and the mud block content is 5 percent.
CaCO in limestone powder3Content (wt.)>93% by weight, and a specific gravity of 2.4 to 2.9kg/m3The particle diameter is less than 80 mu m, and the specific surface area is 300-600 m2In terms of/kg. The limestone powder has double functions in the fine concrete, wherein one function is as partial aggregate to be used as filler to fill holes among sand grains so as to play a role in reinforcement, and the other function is play a role in volcanic ash in the mixing ratio so as to improve the material performance.
The glass powder has the particle diameter of less than 80 microns and the specific surface area of 300-800 m2In terms of/kg. Specific gravity of 2.4-2.7 kg/m3The concrete has extremely high volcanic ash activity, aims to lead the prepared concrete to form compact and piled particles through the filling effect of glass powder fine particles and good and reasonable particle grading, and improves the working performance, the mechanical property and the like of the dredged sand fine concrete.
The cement is P.O 42.5 ordinary portland cement; the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the water-gel ratio is reduced by adding the water reducing agent, and the workability is improved.
The invention relates to a preparation method of fine concrete by taking dredged sand as a main raw material, which specifically comprises the following steps;
step one, weighing 280kg/m of cement3Dredged sand 1500kg/m360kg/m limestone powder360kg/m of glass powder3And adding the mixture into a stirrer to be dry-stirred for 1min until the mixture is uniformly mixed.
Secondly, adding 6.5kg/m of polycarboxylic acid high-efficiency water reducing agent by a post-mixing method3And water 200kg/m3And firstly, wet-mixing water and materials for 30 seconds, and then adding a water reducing agent for wet-mixing for 60 seconds until the materials are uniformly mixed.
And step three, filling the uniformly mixed material into a forming die (namely a test die) with the size of 150 multiplied by 150mm, placing the test die on a concrete vibrating table to vibrate for 30 seconds after adding 1/2 material, then adding the material while vibrating, and keeping the total vibration time less than 2 minutes.
And step four, covering a film on the surface of the test mold after molding, demolding after 12-24 hours, and curing the test piece to a specified age under standard conditions after demolding to obtain the fine concrete (I) based on the dredged sand.
And (3) detecting the compressive strength of the test piece (IV) according to concrete strength test evaluation standard (GBT _ 50107-.
Specific example 6
The invention discloses a fine concrete taking dredged sand as a main raw material, which comprises cement, dredged sand, limestone powder, glass powder, a high-efficiency water reducing agent and water. The density of the fine concrete is 2000-2200 kg/m3The raw materials are in proportion as follows: dredged sand 1200-1500 kg/m3(ii) a 250-400 kg/m cement3(ii) a 60-100 kg/m limestone powder3(ii) a 60-100 kg/m of glass powder3(ii) a 3.5-6.5 kg/m of high-efficiency water reducing agent3(ii) a 150-240 kg/m water3
The dredged sand comprises the following main chemical components: SiO 22、Al2O3、Fe2O3、CaO、 MgO、K2O、Na2O、TiO2And SO3(ii) a The fineness modulus of the dredged sand is 0.1-0.75, and the density is 1.2-1.8 g/cm3(ii) a The diameter of the particles is less than 0.6mm, the mud content is less than 20 percent, and the mud block content is 5 percent.
CaCO in limestone powder3Content (wt.)>93% by weight, and a specific gravity of 2.4 to 2.9kg/m3The particle diameter is less than 80 mu m, and the specific surface area is 300-600 m2In terms of/kg. The limestone powder has double functions in the fine concrete, wherein one function is as partial aggregate to be used as filler to fill holes among sand grains so as to play a role in reinforcement, and the other function is play a role in volcanic ash in the mixing ratio so as to improve the material performance.
GlassThe powder has the particle diameter of less than 80 microns and the specific surface area of 300-800 m2In terms of/kg. Specific gravity of 2.4-2.7 kg/m3The concrete has extremely high volcanic ash activity, aims to lead the prepared concrete to form compact and piled particles through the filling effect of glass powder fine particles and good and reasonable particle grading, and improves the working performance, the mechanical property and the like of the dredged sand fine concrete.
The cement is P.O 42.5 ordinary portland cement; the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the water-gel ratio is reduced by adding the water reducing agent, and the workability is improved.
The invention relates to a preparation method of fine concrete by taking dredged sand as a main raw material, which specifically comprises the following steps;
step one, weighing 400kg/m of cement31200kg/m of dredged sand3100kg/m limestone powder3100kg/m of glass powder3And adding the mixture into a stirrer to be dry-stirred for 1min until the mixture is uniformly mixed.
Secondly, adding 3.5kg/m of polycarboxylic acid high-efficiency water reducing agent by a post-mixing method3And 240kg/m of water3And firstly, wet-mixing water and materials for 30 seconds, and then adding a water reducing agent for wet-mixing for 60 seconds until the materials are uniformly mixed.
And step three, filling the uniformly mixed material into a forming die (namely a test die) with the size of 150 multiplied by 150mm, placing the test die on a concrete vibrating table to vibrate for 30 seconds after adding 1/2 material, then adding the material while vibrating, and keeping the total vibration time less than 2 minutes.
And step four, covering a film on the surface of the test mold after molding, demolding after 12-24 hours, and curing the test piece to a specified age under standard conditions after demolding to obtain the fine concrete (I) based on the dredged sand.
And (3) detecting the compressive strength of the test piece (IV) according to concrete strength test evaluation standard (GBT _ 50107-.
The prepared concrete without coarse aggregates is novel concrete taking sand as a main raw material, does not use coarse aggregates such as stones and the like, can greatly utilize the sand, and effectively uses wastes such as limestone powder, glass powder and the like, so that the dredged sand is taken as the main raw material, and the prepared novel dredged sand concrete with fine particles replaces the common concrete to manufacture a facing brick or a ballast block of a soft body row and the like to be used nearby on site, on one hand, a large amount of dredged sand can be utilized, the local wastes can be effectively used, the land occupation is reduced, the problem of secondary pollution of solid wastes is solved, and the influence of a navigation channel improvement project and the like on the environment is relieved; on the other hand, the cement consumption can be reduced, the construction cost is reduced, and the method has wide application prospect and good ecological benefit.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (9)

1. A fine concrete using dredged sand as a main raw material, characterized in that: comprises cement, dredged sand, limestone powder, regenerated glass powder, a high-efficiency water reducing agent and water.
2. The fine concrete using dredged sand as a main raw material according to claim 1, wherein: the proportion of each raw material is as follows: dredged sand 1200-1500 kg/m3(ii) a 250-400 kg/m cement3(ii) a 60-100 kg/m limestone powder3(ii) a 60-100 kg/m of regenerated glass powder3(ii) a 3.5-6.5 kg/m of high-efficiency water reducing agent3(ii) a 150-240 kg/m water3
3. The fine concrete using dredged sand as a main raw material according to claim 1, wherein: the density of the fine concrete is 2000-2200 kg/m3
4. The fine concrete using dredged sand as a main raw material according to claim 1, wherein: the dredged sand comprises the following main chemical components: SiO 22、Al2O3、Fe2O3、CaO、MgO、K2O、Na2O、TiO2And SO3(ii) a The fineness modulus of the dredged sand is 0.1-0.75, and the density is 1.2-1.8 g/cm3The diameter of the particles is less than 0.3mm, and the mud content is less than 20 percent.
5. The fine concrete using dredged sand as a main raw material according to claim 1, wherein: CaCO in the limestone powder3Content (wt.)>93% by weight, and the specific gravity is 2.4-2.9 kg/m3The particle diameter is less than 80 mu m, and the specific surface area is 300-600 m2/kg。
6. The fine concrete using dredged sand as a main raw material according to claim 1, wherein: the diameter of the regenerated glass powder particles is less than 80 mu m, and the specific surface area is 300-800 m2Kg, specific gravity of 2.4-2.7 kg/m3
7. The fine concrete using dredged sand as a main raw material according to claim 1, wherein: the cement is P.O 42.5 ordinary portland cement.
8. The fine concrete using dredged sand as a main raw material according to claim 1, wherein: the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
9. A preparation method of fine concrete with dredged sand as a main raw material is characterized by comprising the following steps: the method comprises the following steps:
s01, adding the dredged sand, the cement, the limestone powder and the regenerated glass powder into a stirrer according to the raw material proportion, and dry-stirring for 1-2 minutes until the materials are uniformly mixed;
s02, adding a polycarboxylic acid high-efficiency water reducing agent and water by a post-mixing method to improve the adaptability of cement, and wet-mixing until the mixture is uniformly mixed;
s03, adding the uniformly mixed materials into a test mold layer by layer, vibrating the materials added into the test mold 1/2 for 30S on a vibrating table, adding the materials while vibrating, and controlling the vibration forming time to be about 2 minutes;
and S04, covering a film on the surface of the test mold after molding, demolding after 12-24 hours, and curing the test piece to a specified age under standard conditions after demolding to obtain the dredged sand fine concrete.
CN202010673684.7A 2020-07-14 2020-07-14 Fine concrete with dredged sand as main raw material and preparation method thereof Pending CN111960755A (en)

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Application publication date: 20201120