CN114656178B - Cementing material and application thereof - Google Patents

Cementing material and application thereof Download PDF

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Publication number
CN114656178B
CN114656178B CN202210267407.5A CN202210267407A CN114656178B CN 114656178 B CN114656178 B CN 114656178B CN 202210267407 A CN202210267407 A CN 202210267407A CN 114656178 B CN114656178 B CN 114656178B
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parts
stirring
cementing material
aggregate
concrete
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CN114656178A (en
Inventor
许艳平
范志宏
杨海成
邓春林
王嘉雄
刘俊杰
丁平祥
赵家琦
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CCCC Fourth Harbor Engineering Institute Co Ltd
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CCCC Fourth Harbor Engineering Institute Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/32—Aluminous cements
    • C04B7/323—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
    • 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
    • C04B28/08—Slag 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
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
    • C04B7/17—Mixtures thereof with other inorganic cementitious materials or other activators with calcium oxide containing activators
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
    • C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
    • 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
    • C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00284—Materials permeable to liquids
    • 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
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
    • 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
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00758—Uses not provided for elsewhere in C04B2111/00 for agri-, sylvi- or piscicultural or cattle-breeding applications
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Road Paving Structures (AREA)

Abstract

The invention relates to a cementing material and application thereof, and relates to the field of materials. The cementing material comprises: 18-22 parts of sulphoaluminate cement, 28-32 parts of blast furnace slag and 48-52 parts of phosphogypsum. The ecological concrete of the invention comprises: 38-85 parts of aggregate, 8-25 parts of cementing material, 2-6 parts of water, 0.1-0.5 part of reinforcing agent, 0.1-0.5 part of water reducer and 1-2 parts of negative ion powder. The cementing material can well reduce the pore alkalinity of concrete, ensure that vegetation can grow normally, ensure that the strength meets the use requirement, prolong the setting time and ensure the construction performance. The ecological concrete has low pore alkalinity and higher compressive strength, not only can effectively reduce the alkalinity to meet the living condition of organisms, but also can largely utilize industrial solid wastes, thereby changing waste into valuables.

Description

Cementing material and application thereof
Technical Field
The invention relates to the field of materials, in particular to a cementing material and application thereof.
Background
The research and application of ecological concrete are rapidly developed, and play a positive role in resource development and environmental management. However, the alkalinity of the pore liquid of the existing silicate cement concrete material is higher, the pH value is above 13, and most terrestrial and aquatic animals and plants live in neutral or weak alkaline environments, so that the alkalinity of the concrete needs to be reduced to improve the concrete and biocompatibility, but the mechanical property and durability of the concrete are possibly deteriorated due to the excessively low alkalinity, so that the strength is insufficient, and the application of ecological concrete is limited. The existing ecological concrete cannot integrate multiple functions, can not meet the plant growth requirement under the condition of meeting the strength requirement, and also has no environmental protection function requirement of harmful ion adsorption, so that the ecological concrete has a certain restriction on large scale from land to the river, lake and sea beach.
Disclosure of Invention
Aiming at the technical problems, the invention provides the cementing material which can well reduce the pore alkalinity of concrete, ensure that vegetation can grow normally, ensure that the strength meets the use requirement, prolong the setting time and ensure the workability.
In order to achieve the purpose, the invention provides a cementing material which comprises the following raw materials in parts by weight:
18-22 parts of sulphoaluminate cement
28-32 parts of blast furnace slag
48-52 parts of phosphogypsum.
The inventor finds that the sulphoaluminate cement has lower alkalinity and pH value of about 10.5-11 in the research process, can well reduce the pore alkalinity of concrete, and ensures that vegetation can grow normally; the blast furnace slag can improve the later strength of concrete and make up for the defect of insufficient later strength of sulphoaluminate cement; phosphogypsum is used as a retarder, so that the setting time of sulphoaluminate cement can be delayed, and the construction performance is ensured, and therefore, the inventor prepares the low-alkalinity composite cementing material by adopting the raw materials with the weight ratio.
In one embodiment, the cementing material comprises the following raw materials in parts by weight:
sulphoaluminate cement 20 parts
Blast furnace slag 30 parts
50 parts of phosphogypsum.
The cementing material prepared by the weight ratio has the advantages of best effect, low alkalinity and strength meeting the use requirement.
In one embodiment, the strength of the sulphoaluminate cement is 40-45MPa, the blast furnace slag is granulated blast furnace slag powder, and the specific surface area of the granulated blast furnace slag powder is 350-450m 2 /kg。
The raw materials can make up for the defect of insufficient strength due to large porosity, so that the prepared ecological concrete has higher strength; meanwhile, as the slag powder has strong activity, the slag powder can keep better workability and fluidity, and can better improve the later strength of concrete.
The invention also provides ecological concrete, which comprises the following raw materials in parts by weight: 38-85 parts of aggregate, 8-25 parts of cementing material, 2-6 parts of water, 0.1-0.5 part of reinforcing agent, 0.1-0.5 part of water reducer and 1-2 parts of negative ion powder.
By adopting the raw materials in the weight ratio, the ecological concrete with low pore alkalinity and higher compressive strength can be obtained, the strength can be ensured, the alkalinity of the cementing material can be effectively reduced, the living condition of organisms can be met, and the industrial solid waste can be largely utilized, so that waste is turned into wealth; meanwhile, a small amount of tourmaline negative ion powder is doped, the tourmaline negative ion powder has the physical characteristics of piezoelectricity and pyroelectric effect, harmful ions are adsorbed to a crystal negative electrode through a crystal surface electrostatic field, so that the concentration of local harmful ions is increased, the local harmful ions react with a reaction generated by the dissociation of radicals on the surface of tourmaline to form various precipitates or basic salt precipitation, and when the concentration of various ions in the solution reaches balance, the reaction is not continued, so that the problem of excessive treatment and the negative effect are avoided.
In one embodiment, the aggregate is fine stone having a particle size of 3-5mm.
The fine stone with the particle size can ensure that the water permeability coefficient of the concrete is larger than 1mm/s, and ensure that the concrete can meet certain strength.
In one embodiment, the reinforcing agent is a resin reinforcing agent.
In one embodiment, the water reducer is a polycarboxylic acid composite water reducer, the water reducing rate is 20% -30%, and the slurry fluidity is 260-300mm.
The reinforcing agent in the raw materials can further increase the strength of concrete, and the polycarboxylic acid compound water reducer can better adjust the working state of the concrete without reducing the strength.
In one embodiment, the negative ion powder isTourmaline powder with fineness of 7000-9000 meshes and negative ion release amount of more than or equal to 5000 pieces/cm 3 。
The raw materials are adopted, so that a large amount of anions are released, an electric field is formed, and the heavy metal is adsorbed.
The invention also provides a preparation method of the ecological concrete, which comprises the following steps:
preparing a cementing material: weighing raw materials, and mixing to obtain a cementing material;
preparing ecological concrete: mixing the first aggregate with the cementing material, adding the rest aggregate, performing first stirring, adding water and a water reducing agent, performing second stirring, adding an enhancer and anion powder, and performing third stirring to obtain the ecological concrete.
The preparation method is simple and easy to implement, can be used for quick mixing and direct pouring on site, and the formed porous functional concrete has higher compressive strength, alkalinity lower than 9 and environmental pollution control function; in the step of preparing the ecological concrete, a part of aggregate and the cementing material are mixed first, and the rest aggregate is added, so that the dispersing effect of the operation is better.
In one embodiment, the weight ratio of the first aggregate to the aggregate is 0.8-1.2:2, the stirring time of the first stirring is 25-35s, the stirring time of the second stirring is 25-35s, and the stirring time of the third stirring is 3-6min.
Compared with the prior art, the invention has the following beneficial effects:
the cementing material can well reduce the pore alkalinity of concrete, ensure that vegetation can grow normally, ensure that the strength meets the use requirement, prolong the setting time and ensure the workability. The ecological concrete prepared by the cementing material has low pore alkalinity and higher compressive strength, not only can effectively reduce the alkalinity so as to meet the living condition of organisms, but also can largely utilize industrial solid wastes, thereby changing waste into valuables; the concrete can be directly applied to the beach such as rivers, lakes and seas or roads, not only can meet the greening requirement, but also can permeate water and adsorb harmful ions, and has certain strength, thereby integrating multiple functions.
Detailed Description
In order that the invention may be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Blast furnace slag: is a waste residue discharged from a blast furnace during pig iron smelting.
Phosphogypsum: is solid waste generated in the wet phosphoric acid process.
Aggregate: also called aggregate, one of the main constituent materials of concrete.
The source is as follows:
resin binder (Guangzhou bridge resin binder), and polycarboxylic acid high-efficiency composite water reducer (great-efficiency composite water reducer).
The reagents, materials and equipment used in the examples are all commercially available sources unless otherwise specified; the experimental methods are all routine experimental methods in the field unless specified.
The raw material components and weights in the following examples and comparative examples are shown in the following table:
table 1 raw material components, weight and parts by weight of each of examples and comparative examples
Figure BDA0003552914380000031
Figure BDA0003552914380000041
Figure BDA0003552914380000051
Example 1
Preparing ecological concrete.
1. And (5) preparing a cementing material.
And mixing the sulphoaluminate cement, the granulated blast furnace slag powder and the phosphogypsum in a weight ratio of 2:3:5 to obtain the cementing material.
The strength of the sulphoaluminate cement is 42.5MPa, and the specific surface area of the granulated blast furnace slag powder is more than 400m 2 And/kg S95 of ground granulated blast furnace slag powder.
2. And preparing ecological concrete.
(1) Weighing the following raw materials in parts by weight: 1529kg of aggregate, 380kg of cementing material, 106kg of water consumption, 3kg of reinforcing agent, 7.1kg of water reducer and 19kg of negative ion powder.
In the embodiment, the aggregate is fine stone with the grain size range of 3-5mm, and the mud content and the mud block content meet the requirements of class II gravels in pebble and gravels for building GB/T14685 and meet the aggregate requirements in CJJT135-2009 in the technical regulations of permeable cement concrete pavement; the water reducer is a polycarboxylic acid high-efficiency composite water reducer, the water reducing efficiency is about 25%, and the fluidity of the clear slurry is 280mm; the reinforcing agent is a resin binder and meets the requirements of the technical index of the reinforcing agent in CJJT135-2009 of the technical regulations of permeable cement concrete pavement; the negative ion powder is 8000-mesh tourmaline negative ion powder, and the release amount of negative ions is more than or equal to 5000 pieces/cm 3 。
(2) And adding half of the aggregate into a stirring pot, adding the cementing material into the stirring pot, adding the rest aggregate into the stirring pot, stirring for 30s, adding water and a water reducing agent, stirring for 30s, adding an enhancer and anion powder, stirring for 30s, and continuing stirring for 3-5min to obtain the ecological concrete.
Example 2
Preparing ecological concrete.
1. And (5) preparing a cementing material.
And mixing the sulphoaluminate cement, the granulated blast furnace slag powder and the phosphogypsum in a weight ratio of 2:3:5 to obtain the cementing material.
The strength of the sulphoaluminate cement is 42.5MPa, and the specific surface area of the granulated blast furnace slag powder is more than 400m 2 And/kg S95 of ground granulated blast furnace slag powder.
2. And preparing ecological concrete.
(1) Weighing the following raw materials in parts by weight: 1529kg of aggregate, 380kg of cementing material, 106kg of water consumption, 6kg of reinforcing agent, 7.1kg of water reducer and 38kg of anion powder.
In the embodiment, the aggregate is fine stone with the grain size range of 3-5mm, and the mud content and the mud block content meet the requirements of class II gravels in pebble and gravels for building GB/T14685 and meet the aggregate requirements in CJJT135-2009 in the technical regulations of permeable cement concrete pavement; the water reducer is a polycarboxylic acid high-efficiency composite water reducer, the water reducing efficiency is about 25%, and the fluidity of the clear slurry is 280mm; the reinforcing agent is a resin binder and meets the requirements of the technical index of the reinforcing agent in CJJT135-2009 of the technical regulations of permeable cement concrete pavement; the negative ion powder is 8000-mesh tourmaline negative ion powder, and the release amount of negative ions is more than or equal to 5000 pieces/cm 3 。
(2) And adding half of the aggregate into a stirring pot, adding the cementing material into the stirring pot, adding the rest aggregate into the stirring pot, stirring for 30s, adding water and a water reducing agent, stirring for 30s, adding an enhancer and anion powder, stirring for 30s, and continuing stirring for 3-5min to obtain the ecological concrete.
Comparative example 1
Preparing ecological concrete.
1. And (5) preparing a cementing material.
And mixing the sulphoaluminate cement, the granulated blast furnace slag powder and the phosphogypsum in a weight ratio of 2:3:5 to obtain the cementing material.
2. And preparing ecological concrete.
(1) Weighing the following raw materials in parts by weight: 1529kg of aggregate, 380kg of cementing material, 106kg of water consumption and 7.1kg of water reducer, and no reinforcing agent or negative ion powder is added.
In the embodiment, the aggregate is fine stone with the grain size range of 3-5mm, and the mud content and the mud block content meet the requirements of class II gravels in pebble and gravels for building GB/T14685 and meet the aggregate requirements in CJJT135-2009 in the technical regulations of permeable cement concrete pavement; the water reducer is a polycarboxylic acid high-efficiency composite water reducer, the water reducing efficiency is about 25%, and the fluidity of the clear slurry is 280mm.
(2) And adding half of the aggregate into a stirring pot, adding the cementing material into the stirring pot, adding the rest aggregate into the stirring pot, stirring for 30s, adding water and a water reducing agent, stirring for 30s, and continuing stirring for 3-5min to obtain the ecological concrete.
Comparative example 2
Preparing ecological concrete.
1. And (5) preparing a cementing material.
And mixing the sulphoaluminate cement, the granulated blast furnace slag powder and the phosphogypsum in a weight ratio of 2:3:5 to obtain the cementing material.
2. And preparing ecological concrete.
(1) Weighing the following raw materials in parts by weight: 1529kg of aggregate, 380kg of cementing material, 106kg of water consumption, 6kg of reinforcing agent and 7.1kg of water reducer, and no negative ion powder is added.
In the embodiment, the aggregate is fine stone with the grain size range of 3-5mm, and the mud content and the mud block content meet the requirements of class II gravels in pebble and gravels for building GB/T14685 and meet the aggregate requirements in CJJT135-2009 in the technical regulations of permeable cement concrete pavement; the water reducer is a polycarboxylic acid high-efficiency composite water reducer, the water reducing efficiency is about 25%, and the fluidity of the clear slurry is 280mm; the reinforcing agent is a resin binder and meets the requirements of the technical index of the reinforcing agent in CJJT135-2009 of the technical regulations of permeable cement concrete pavement.
(2) And adding half of the aggregate into a stirring pot, adding the cementing material into the stirring pot, adding the rest aggregate into the stirring pot, stirring for 30s, adding water and a water reducing agent, stirring for 30s, adding an enhancer, stirring for 30s, and continuing stirring for 3-5min to obtain the ecological concrete.
Comparative example 3
Preparing ecological concrete.
1. And (5) preparing a cementing material.
And mixing the silicate cement, the granulated blast furnace slag powder and the phosphogypsum in a weight ratio of 2:3:5 to obtain the cementing material.
The strength of the silicate cement is 42.5MPa, and the specific surface area of the granulated blast furnace slag powder is more than 400m 2 And/kg S95 of ground granulated blast furnace slag powder.
2. And preparing ecological concrete.
(1) Weighing the following raw materials in parts by weight: 1529kg of aggregate, 380kg of cementing material, 106kg of water consumption, 3kg of reinforcing agent, 7.1kg of water reducer and 19kg of negative ion powder.
In the embodiment, the aggregate is fine stone with the grain size range of 3-5mm, and the mud content and the mud block content meet the requirements of class II gravels in pebble and gravels for building GB/T14685 and meet the aggregate requirements in CJJT135-2009 in the technical regulations of permeable cement concrete pavement; the water reducer is a polycarboxylic acid high-efficiency composite water reducer, the water reducing efficiency is about 25%, and the fluidity of the clear slurry is 280mm; the reinforcing agent is a resin binder and meets the requirements of the technical index of the reinforcing agent in CJJT135-2009 of the technical regulations of permeable cement concrete pavement; the negative ion powder is 8000-mesh tourmaline negative ion powder, and the release amount of negative ions is more than or equal to 5000 pieces/cm 3 。
(2) And adding half of the aggregate into a stirring pot, adding the cementing material into the stirring pot, adding the rest aggregate into the stirring pot, stirring for 30s, adding water and a water reducing agent, stirring for 30s, adding an enhancer and anion powder, stirring for 30s, and continuing stirring for 3-5min to obtain the ecological concrete.
Comparative example 4
Preparing ecological concrete.
1. And (5) preparing a cementing material.
And mixing the sulphoaluminate cement, the fly ash and the phosphogypsum in a weight ratio of 2:3:5 to obtain the cementing material.
The sulphoaluminate cementThe strength is 42.5MPa, and the specific surface area of the granulated blast furnace slag powder is more than 400m 2 And/kg S95 of ground granulated blast furnace slag powder.
2. And preparing ecological concrete.
(1) Weighing the following raw materials in parts by weight: 1529kg of aggregate, 380kg of cementing material, 106kg of water consumption, 3kg of reinforcing agent, 7.1kg of water reducer and 19kg of negative ion powder.
In the embodiment, the aggregate is fine stone with the grain size range of 3-5mm, and the mud content and the mud block content meet the requirements of class II gravels in pebble and gravels for building GB/T14685 and meet the aggregate requirements in CJJT135-2009 in the technical regulations of permeable cement concrete pavement; the water reducer is a polycarboxylic acid high-efficiency composite water reducer, the water reducing efficiency is about 25%, and the fluidity of the clear slurry is 280mm; the reinforcing agent is a resin binder and meets the requirements of the technical index of the reinforcing agent in CJJT135-2009 of the technical regulations of permeable cement concrete pavement; the negative ion powder is 8000-mesh tourmaline negative ion powder, and the release amount of negative ions is more than or equal to 5000 pieces/cm 3 。
(2) And adding half of the aggregate into a stirring pot, adding the cementing material into the stirring pot, adding the rest aggregate into the stirring pot, stirring for 30s, adding water and a water reducing agent, stirring for 30s, adding an enhancer and anion powder, stirring for 30s, and continuing stirring for 3-5min to obtain the ecological concrete.
Comparative example 5
Preparing ecological concrete.
1. And (5) preparing a cementing material.
And mixing the sulphoaluminate cement, the granulated blast furnace slag powder and the phosphogypsum in a weight ratio of 2:2:6 to obtain the cementing material.
The strength of the sulphoaluminate cement is 42.5MPa, and the specific surface area of the granulated blast furnace slag powder is more than 400m 2 And/kg S95 of ground granulated blast furnace slag powder.
2. And preparing ecological concrete.
(1) Weighing the following raw materials in parts by weight: 1529kg of aggregate, 380kg of cementing material, 106kg of water consumption, 3kg of reinforcing agent, 7.1kg of water reducer and 19kg of negative ion powder.
In the embodiment, the aggregate is fine stone with the grain size range of 3-5mm, and the mud content and the mud block content meet the requirements of class II gravels in pebble and gravels for building GB/T14685 and meet the aggregate requirements in CJJT135-2009 in the technical regulations of permeable cement concrete pavement; the water reducer is a polycarboxylic acid high-efficiency composite water reducer, the water reducing efficiency is about 25%, and the fluidity of the clear slurry is 280mm; the reinforcing agent is a resin binder and meets the requirements of the technical index of the reinforcing agent in CJJT135-2009 of the technical regulations of permeable cement concrete pavement; the negative ion powder is 8000-mesh tourmaline negative ion powder, and the release amount of negative ions is more than or equal to 5000 pieces/cm 3 。
(2) And adding half of the aggregate into a stirring pot, adding the cementing material into the stirring pot, adding the rest aggregate into the stirring pot, stirring for 30s, adding water and a water reducing agent, stirring for 30s, adding an enhancer and anion powder, stirring for 30s, and continuing stirring for 3-5min to obtain the ecological concrete.
Comparative example 6
Preparing ecological concrete.
1. And (5) preparing a cementing material.
And mixing the sulphoaluminate cement, the granulated blast furnace slag powder and the phosphogypsum in a weight ratio of 3:2:5 to obtain the cementing material.
The strength of the sulphoaluminate cement is 42.5MPa, and the specific surface area of the granulated blast furnace slag powder is more than 400m 2 And/kg S95 of ground granulated blast furnace slag powder.
2. And preparing ecological concrete.
(1) Weighing the following raw materials in parts by weight: 1529kg of aggregate, 380kg of cementing material, 106kg of water consumption, 3kg of reinforcing agent, 7.1kg of water reducer and 19kg of negative ion powder.
In the embodiment, the aggregate is fine stone with the grain size range of 3-5mm, and the mud content and the mud block content meet the requirements of class II gravels in pebble and gravels for building GB/T14685 and meet the aggregate requirements in CJJT135-2009 in the technical regulations of permeable cement concrete pavement; the water reducer is a polycarboxylic acid high-efficiency composite water reducer, the water reducing efficiency is about 25%, and the water reducer is cleanPulp fluidity 280mm; the reinforcing agent is a resin binder and meets the requirements of the technical index of the reinforcing agent in CJJT135-2009 of the technical regulations of permeable cement concrete pavement; the negative ion powder is 8000-mesh tourmaline negative ion powder, and the release amount of negative ions is more than or equal to 5000 pieces/cm 3 。
(2) And adding half of the aggregate into a stirring pot, adding the cementing material into the stirring pot, adding the rest aggregate into the stirring pot, stirring for 30s, adding water and a water reducing agent, stirring for 30s, adding an enhancer and anion powder, stirring for 30s, and continuing stirring for 3-5min to obtain the ecological concrete.
Experimental example
1. The ecological concrete obtained in each example and comparative example was subjected to performance test.
The test method of each performance index is as follows:
(1) Test for harmful ion removal: copper ions and methylene blue ions are mainly adopted for testing, wherein copper ion solution (100 mg/L) is adopted for copper ions to carry out three times of filtering on concrete, the content of residual copper ions in filtrate is tested, and then the removal rate is calculated with the concentration of the original solution; the methylene blue ion is obtained by immersing concrete in methylene blue solution (15 mg/L) for 24 hours, testing the content of the methylene blue ion in the immersed solution, and calculating the removal rate with the concentration of the original solution.
(2) Test method of 7-day strength and 28-day strength: the test is carried out according to the test method standard of physical and mechanical properties of concrete GB-T50081-2019.
(3) The pH value test method comprises the following steps: crushing concrete, removing stones, drying in an oven at 65 ℃ for 24 hours (the hydration is not stopped before drying, because experiments prove that the measured pH value of the cement paste can be reduced by 1-2 after the hydration is stopped by using acetone, which is far smaller than the normal value of the cement paste), taking out, grinding into fine powder, sieving with a square hole sieve of 0.08mm, weighing 3g of sieving powder, weighing three samples according to each mixing ratio, adding 30ml of water according to a solid-to-liquid ratio of 10:1, stirring for 30 minutes, standing for 12 hours, and finally detecting the pH value of supernatant by using a pH meter.
(4) The method for testing the negative ion release amount comprises the following steps: and in the enclosed space, adopting a COM-3200 PROII negative ion detector to test the negative ion release amount of the negative ion powder and the functional concrete.
(5) The water permeability coefficient testing method comprises the following steps: according to annex A of CJJT135-2009 of Water permeable Cement concrete pavement technical Specification.
(6) The porosity test method comprises the following steps: according to annex A of the technical specification of the application of recycled aggregate pervious concrete.
The results are shown in the following table: the ecological concrete prepared by each embodiment has pH less than 9, compressive strength of more than 25MPa, and large porosity, and is suitable for plant growth and has good harmful ion adsorption performance.
TABLE 2 test data for ecological concrete of examples and comparative examples
Figure BDA0003552914380000091
Figure BDA0003552914380000101
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (6)

1. The cementing material for reducing the pore alkalinity of the concrete to ensure the normal growth of vegetation is characterized by comprising the following raw materials in parts by weight:
sulphoaluminate cement 20 parts
Blast furnace slag 30 parts
50 parts of phosphogypsum;
the strength of the sulphoaluminate cement is 40-45MPa, the blast furnace slag is granulated blast furnace slag powder, and the specific surface area of the granulated blast furnace slag powder is 350-450m 2 /kg。
2. The ecological concrete is characterized by comprising the following raw materials in parts by weight: 38-85 parts of aggregate, 8-25 parts of cementing material according to claim 1, 2-6 parts of water, 0.1-0.5 part of reinforcing agent, 0.1-0.5 part of water reducer and 1-2 parts of negative ion powder;
the reinforcing agent is a resin reinforcing agent;
the negative ion powder is tourmaline powder, the fineness of the tourmaline powder is 7000-9000 meshes, and the negative ion release amount is more than or equal to 5000 pieces/cm 3 。
3. The ecological concrete of claim 2, wherein the aggregate is fine stone, the fine stone having a particle size of 3-5mm.
4. The ecological concrete according to claim 2, wherein the water reducer is a polycarboxylic acid composite water reducer, the water reduction rate is 20% -30%, and the paste fluidity is 260-300mm.
5. The method for preparing the ecological concrete according to any one of claims 2 to 4, characterized in that the method comprises the following steps:
preparing a cementing material: weighing raw materials, and mixing to obtain a cementing material;
preparing ecological concrete: and mixing half of the aggregate with the cementing material, adding the rest aggregate, carrying out first stirring, adding water and a water reducing agent, carrying out second stirring, adding an enhancer and anion powder, and carrying out third stirring to obtain the ecological concrete.
6. The method according to claim 5, wherein the stirring time of the first stirring is 25 to 35s, the stirring time of the second stirring is 25 to 35s, and the stirring time of the third stirring is 3 to 6min.
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