CN115745483A - High-strength cementing material based on fine particle sludge and preparation method thereof - Google Patents
High-strength cementing material based on fine particle sludge and preparation method thereof Download PDFInfo
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Abstract
The invention provides a high-strength cementing material based on fine particle sludge and a preparation method thereof, wherein the cementing material comprises the following components in parts by weight: 150-200 parts of cement, 80-120 parts of modified spherical granular materials, 40-70 parts of deposited granular coarse materials, 24-28 parts of silicon powder, 23-27 parts of fly ash, 11-14 parts of ultrafine powder, 20-25 parts of steel fibers, 5-10 parts of latex powder, 6-7 parts of water reducing agent and 21-24 parts of water; the modified spherical particle material is prepared by the following method: heating and melting the matrix material, adding the deposited fine particle material, stirring uniformly to obtain mixed slurry, performing spray granulation on the mixed slurry by using high-speed airflow in the outflow process, drying, and performing vibration screening to obtain the composite material. The sedimentation particles in the reservoir area are added into the cementing material, so that the problem that the existing sedimentation particles cannot be recycled is effectively solved.
Description
Technical Field
The invention belongs to the technical field of cementing material preparation, and particularly relates to a high-strength cementing material based on fine particle sludge and a preparation method thereof.
Background
The average sedimentation rate of the established reservoir is about 20 percent, the sedimentation rate of the annual average reservoir capacity is 0.76 percent, and the annual loss reservoir capacity is 42.3 hundred million meters 3 The sludge in reservoirs, rivers and lakes is usually composed of clay, silt, sand, organic matter, various minerals, etcSludge is deposited in bottom areas of reservoirs, rivers, etc. by many physical, chemical and biological processes. Reservoir dams are important infrastructure, and sedimentation of the reservoir dams seriously influences the exertion of functions of reservoir flood control, water supply and the like, and becomes a constraint factor of sustainable development. The current common treatment methods comprise physical and chemical methods such as a screening building material method, a sludge landfill method, a sludge composting method, an anaerobic biogas production method, a sludge blending and burning method, a chemical curing method and the like, wherein the building material method mainly comprises the steps of using as backfill, burning into bricks, preparing ceramsite and the like, but the problem of recycling the deposited granular materials is not solved. The method has the advantages that the storage reservoir has large deposition amount, the deposition components and distribution are complex, and how to treat the deposition harmlessly and resourcefully, especially the deposition of ultrafine particles, and the realization of large-scale resource development and utilization is a worldwide problem. The research on cleaning the reservoir sludge is more, but resource utilization, especially the research on ultrafine particles in the sludge is insufficient, and no mature technology exists, so that technological innovation is needed to realize breakthrough and industrialization is needed.
Therefore, the preparation of the high-strength cementing material by adopting the deposited granular materials has great significance for engineering construction. The research on the preparation technology of the cementing material of the ultrafine particle sludge can provide a new solution for the resource utilization of ultrafine waste materials in the sludge of a plurality of reservoirs in China to support the sustainable development of flood control and water supply benefits of the reservoirs, form a breakthrough in innovative technology, realize international introduction and have great significance.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a high-strength cementing material based on fine-particle sludge and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a high-strength cementing material based on fine particle sludge, which comprises the following components in parts by weight: 150-200 parts of cement, 80-120 parts of modified spherical granular materials, 40-70 parts of deposited granular coarse materials, 24-28 parts of silicon powder, 23-27 parts of fly ash, 11-14 parts of ultrafine powder, 20-25 parts of steel fibers, 5-10 parts of latex powder, 6-7 parts of water reducing agent and 21-24 parts of water;
the modified spherical particle material is prepared by the following method: heating and melting the base material, adding the deposited fine granular material, stirring uniformly to obtain mixed slurry, performing spray granulation on the mixed slurry by using high-speed airflow in the outflow process, drying, vibrating and sieving to obtain the high-performance composite material.
According to the scheme, cement is used as a main raw material, particle materials with different particle size structures are added into the cement, and particles with different fineness are reasonably blended by utilizing a close packing theory, so that a cementing system is close to close packing to the maximum extent, the strength and the compactness of the cementing material are improved, and the generation of internal pores is reduced; the modified spherical particle materials are added, and are made of high-sludge-content sedimentation particle fine materials, so that the resource utilization of the sedimentation particle fine materials can be improved, and the influence of sedimentation particles on the functions of a reservoir area is reduced; the deposited fine particle materials are made into a spherical shape, the spherical structure has good dispersibility, the dispersion degree of the cementing material can be increased in the preparation process, so that the particles have good dispersibility and fluidity under the condition of extremely low water-to-gel ratio, and the preparation operation is convenient to carry out; due to the extremely low water-to-gel ratio, pores generated by hydration in the prepared cementing material are reduced, and the cementing material has high compressive strength; in the preparation process, the steel fiber and the sedimentation particle coarse material are used, the steel fiber and the sedimentation particle coarse material can form a three-dimensional disorientation supporting system in the cementing material, a good lap joint structure is formed in the cementing material, and the toughness and the crack resistance of the cementing material are further improved.
The method of the invention prepares the modified spherical particle material by combining the deposited particle fine material and the matrix material, has higher strength and can meet the preparation requirement of high-strength cementing material. The silting granule fine material is waste material, adopts special method in this application to carry out recycle with waste material, effectively improves the utilization of resources of silting granule.
The latex powder is added in the raw materials, and can be used for forming a waterproof protective film in the cementing material, so that the waterproof performance of the cementing material is improved, and the service life of the cementing material is prolonged.
Further, the paint comprises the following components in parts by weight: 150 parts of cement, 110 parts of modified spherical particles, 60 parts of deposited particle coarse materials, 25 parts of silicon powder, 26 parts of fly ash, 14 parts of superfine powder, 23 parts of steel fiber, 8 parts of latex powder, 7 parts of water reducing agent and 23 parts of water.
Further, the volume ratio of the matrix material to the deposit particle fines is 2-4.
In the above scheme, the matrix material serves as a binding matrix and the deposited fine particles are included, so that the sludge component and the fine particles in the deposited fine particles exist in an overall situation.
Further, the matrix material is prepared by mixing polycarbonate and asphalt according to the volume ratio of 1.
In the above scheme, the polycarbonate has stronger hardness and wear resistance after hardening, the asphalt has stronger bonding effect, both have waterproof performance, and mix the asphalt and the polycarbonate for use, the polycarbonate can strengthen the intensity of the asphalt, so that the intensity of the mixture is higher, and the waterproof performance of both can also avoid mud and water in the sediment particle fines from contacting, and then reduce the amount of water in the preparation process.
Furthermore, the grain diameter of the deposited particle fine material is 20-60 μm, and the sludge content in the deposited particle fine material is 8-12%.
In the above scheme, the particle size of the silting particles is smaller, so that the utilization degree of the silting particles can be improved, the wrapped effect can be enhanced, the size of the prepared modified spherical particle material is ensured, and the modified spherical particle material can meet the preparation requirement of the cementing material.
Further, the gas flow rate of the high-speed gas flow is more than 850m/s, and the gas temperature is lower than 120 ℃.
In the scheme, under the action of high-speed airflow, the raw materials in a slurry form are blown away to form mist-state particles, the matrix material is rapidly cooled and solidified in the blowing-away process to form spherical particles, and the spherical particles prepared by the method have a certain particle size and can be used as fine sand.
Furthermore, the grain diameter of the deposition grain coarse material is 80-180 μm, and the grain diameter of the modified sphere grain material is 200-500 μm.
Furthermore, the particle size of the silicon powder is 0.2-0.5 μm, and the fineness of the superfine powder is 1-10 μm.
According to the scheme, the raw materials are different in particle size, different raw materials are mutually graded, and the small-particle-size materials are used for filling the pores among the large-particle-size materials, so that the compactness of the cementing material is increased, and the compressive strength of the cementing material is improved.
Furthermore, the length of the steel fiber is 10-15mm, the diameter is 0.15-0.30mm, and the tensile strength is more than 2800MPa.
In the above scheme, the steel fibers are copper-plated steel fibers, and are added, so that the steel fibers can form disorderly distribution in the cementing material to form a lap joint structure, and the toughness and the crack resistance of the cementing material are improved.
The preparation method of the high-strength cementing material based on the fine particle sludge comprises the following steps:
(1) Uniformly mixing the modified spherical particle material, the deposited coarse particle material, the steel fiber and the latex powder;
(2) Pouring silicon powder, fly ash, ultrafine powder and cement into the mixture, and continuously mixing uniformly to obtain a mixture;
(3) And adding water and a water reducing agent into the mixture, and uniformly mixing to obtain the water reducing agent.
In the above scheme, latex powder is mixed with modified sphere granule material, deposition particle coarse material and steel fiber, the adhesion of latex powder on the surface of the raw materials is improved, and in the subsequent water adding mixing process, the latex powder can form a protective film on the surface of the raw materials, and meanwhile, the bonding effect between the raw materials and other materials is improved, and finally the strength of the cementing material is improved.
The beneficial effects produced by the invention are as follows:
1. according to the application, the deposited fine particle materials are modified, the substrate material is used for adhering and wrapping the deposited fine particle materials in the treatment process, and the substrate material has high strength and hydrophobicity, so that the deposited fine particle materials can be prevented from participating in the reaction, the resource utilization of the deposited fine particle materials can be realized by the mode, the mode has low requirement on mud content in the deposited fine particle materials, and the operation procedures such as screening can be reduced; the modified spherical particle material has stronger hydrophobicity and higher strength, so that the overall strength of the cementing material can be improved; and because the modified spherical particle material is spherical, the spherical particle material has better dispersibility, after the spherical particle material is added, the water adding amount in the preparation process of the cementing material can be reduced, under the condition of lower water-cement ratio, the slurry of the cementing material still has better fluidity, the operation is convenient, and the strength of the cementing material can also be improved.
2. Utilize the closely knit degree theory in this application, use the raw materials of different particle sizes, utilize the difference between the different raw materials particle sizes, improve the closely knit degree of cementing material, and then increase the intensity of cementing material.
Drawings
FIG. 1 is a microscopic topography of the cement under a macroscopic mirror in example 4;
figure 2 is a microscopic topography of the cement under a high power mirror of example 4.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Example 1
A high-strength cementing material based on fine particle sludge, which comprises the following components in parts by weight: 150 parts of cement, 90 parts of modified spherical particle materials, 50 parts of deposited particle coarse materials, 26 parts of silicon powder, 24 parts of fly ash, 12 parts of ultrafine powder, 22 parts of steel fibers, 7 parts of latex powder, 6 parts of water reducing agent and 21 parts of water, wherein the average particle size of the deposited particle coarse materials is 100 microns, the average particle size of the modified spherical particle materials is 250 microns, the particle size of the silicon powder is 0.3 micron, the fineness of the ultrafine powder is 3 microns, the length of the steel fibers is 12mm, the diameter of the steel fibers is 0.18mm, and the tensile strength of the steel fibers is more than 2800MPa;
the modified spherical particle material is prepared by the following method: heating and melting a base material, adding the deposited fine particle material, uniformly stirring to obtain mixed slurry, performing spray granulation on the mixed slurry by using high-speed airflow in the outflow process, wherein the gas flow rate of the high-speed airflow is more than 850m/s, the gas temperature is lower than 120 ℃, drying, and performing vibration screening to obtain the composite material; wherein, the volume ratio of the base material to the deposition particle fine material is 2; the particle size of the deposited fine particles was 30 μm, and the sludge content in the deposited fine particles was 8%.
The preparation method of the high-strength cementing material based on the fine particle sludge comprises the following steps:
(1) Mixing and stirring the modified spherical particle material, the deposited coarse particle material, the steel fiber and the latex powder for 100s;
(2) Pouring silicon powder, fly ash, ultrafine powder and cement into the mixture, and continuously stirring for 90s to obtain a mixture;
(3) And adding water and a water reducing agent into the mixture, and stirring for 2min to obtain the water-based paint.
The 28d compressive strength of the cement was measured to be 106.8MPa.
Example 2
A high-strength cementing material based on fine particle sludge, which comprises the following components in parts by weight: 180 parts of cement, 110 parts of modified spherical particle materials, 60 parts of deposited particle coarse materials, 26 parts of silicon powder, 26 parts of fly ash, 13 parts of ultrafine powder, 24 parts of steel fibers, 8 parts of latex powder, 7 parts of water reducing agent and 23 parts of water, wherein the particle size of the deposited particle coarse materials is 160 microns, the particle size of the modified spherical particle materials is 400 microns, the particle size of the silicon powder is 0.4 micron, the fineness of the ultrafine powder is 8 microns, the length of the steel fibers is 14mm, the diameter of the steel fibers is 0.25mm, and the tensile strength of the steel fibers is greater than 2800MPa;
the modified spherical particle material is prepared by the following method: heating and melting a base material, adding the deposited fine particle material, uniformly stirring to obtain mixed slurry, performing spray granulation on the mixed slurry by using high-speed airflow in the outflow process, drying and vibrating and sieving to obtain the high-speed airflow, wherein the gas flow rate of the high-speed airflow is more than 850m/s, and the gas temperature is lower than 120 ℃; wherein, the volume ratio of the base material to the deposition particle fines is 4; the grain size of the deposited grain fines is 50 μm, and the sludge content in the deposited grain fines is 10%.
The preparation method is the same as example 1.
The compressive strength of the above cement 28d was measured to be 105.5MPa.
Example 3
A high-strength cementing material based on fine particle sludge, which comprises the following components in parts by weight: 170 parts of cement, 100 parts of modified spherical particle materials, 70 parts of deposited particle coarse materials, 28 parts of silicon powder, 25 parts of fly ash, 13 parts of ultrafine powder, 23 parts of steel fibers, 7 parts of latex powder, 7 parts of water reducing agent and 23 parts of water, wherein the particle size of the deposited particle coarse materials is 150 micrometers, the particle size of the modified spherical particle materials is 300 micrometers, the particle size of the silicon powder is 0.4 micrometers, the fineness of the ultrafine powder is 6 micrometers, the length of the steel fibers is 13mm, the diameter of the steel fibers is 0.2mm, and the tensile strength of the steel fibers is more than 2800MPa;
the modified spherical particle material is prepared by the following method: heating and melting a base material, adding the deposited fine particle material, uniformly stirring to obtain mixed slurry, performing spray granulation on the mixed slurry by using high-speed airflow in the outflow process, wherein the gas flow rate of the high-speed airflow is more than 850m/s, the gas temperature is lower than 120 ℃, drying, and performing vibration screening to obtain the composite material; wherein, the volume ratio of the base material to the deposition particle fines is 3; the particle size of the deposited fine particles was 30 μm, and the sludge content in the deposited fine particles was 12%.
The preparation method is the same as example 1.
The 28d compressive strength of the cement was measured to be 106.3MPa.
Example 4
A high-strength cementing material based on fine particle sludge comprises the following components in parts by weight: 150 parts of cement, 110 parts of modified spherical particle materials, 60 parts of deposited particle coarse materials, 25 parts of silicon powder, 26 parts of fly ash, 14 parts of ultrafine powder, 23 parts of steel fibers, 8 parts of latex powder, 7 parts of water reducing agent and 23 parts of water, wherein the particle size of the deposited particle coarse materials is 160 microns, the particle size of the modified spherical particle materials is 500 microns, the particle size of the silicon powder is 0.4 micron, the fineness of the ultrafine powder is 8 microns, the length of the steel fibers is 14mm, the diameter of the steel fibers is 0.25mm, and the tensile strength of the steel fibers is more than 2800MPa;
the modified spherical particle material is prepared by the following method: heating and melting a base material, adding the deposited fine particle material, uniformly stirring to obtain mixed slurry, performing spray granulation on the mixed slurry by using high-speed airflow in the outflow process, drying and vibrating and sieving to obtain the high-speed airflow, wherein the gas flow rate of the high-speed airflow is more than 850m/s, and the gas temperature is lower than 120 ℃; wherein, the volume ratio of the matrix material to the deposited particle fine material is 3; the grain size of the deposited grain fine material is 40 μm, and the mud content in the deposited grain fine material is 12%.
The preparation method is the same as example 1.
The 28d compressive strength of the cement was measured to be 107.6MPa.
Comparative example 1
On the basis of example 4, the modification treatment of the sludge fines was dispensed with, and instead the sludge fines were added directly as raw material.
Because the added sludge particle fine materials contain a large amount of mud, excessive moisture is absorbed in the mixing process, so that the cementing materials cannot be uniformly mixed, and the cementing materials with uniform shapes are formed.
Comparative example 2
On the basis of example 4, the use of latex powder was eliminated.
The 28d compressive strength of the above cement was determined to be 98.4MPa.
Comparative example 3
On the basis of example 4, the volume ratio of matrix material to sludge particle fines was changed to 1.
The 28d compressive strength of the above cement was measured to be 92.2MPa.
Comparative example 4
The particle size of the modified spherical particles was adjusted to 2mm based on example 4.
The 28d compressive strength of the above cement was measured to be 101.5MPa.
Comparative example 5
On the basis of example 4, the ratio of polycarbonate to bitumen in the matrix material was adjusted to 1
The 28d compressive strength of the above cement was measured to be 99.4MPa.
Test examples
By comparing the compressive properties of the cements 28d of examples 1-4 and comparative examples 1-5, it was found that the compressive strength of the cement 28d of comparative examples 1-5 was lower than that of the cements of examples 1-4. Comparing the solutions of comparative examples 1-5 with the solution of example 4, it can be concluded that the modification of the sludge fines, the ratio of polycarbonate to bitumen during the modification, the ratio of matrix material to sludge fines, the particle size of the modified spherical particles and the use of latex powder all affect the compressive strength of the cement.
Taking the cement of example 4 as an example, the microscopic topography was observed by a QUANTA FEG 250 environment scanning electron microscope, and the specific microstructure is shown in FIGS. 1-2.
Fig. 1 is a microscopic topography of the cementing material under a low power lens, and it can be known from fig. 1 that the internal structure of the cementing material is compact and has no excessive void structure.
Fig. 2 is a microscopic topography of the cementing material under a high power lens, and it can be seen from fig. 2 that the cementing material contains a spherical structure, i.e., a modified spherical particle material, a plurality of granular substances exist on the surface of the spherical structure, i.e., particles in the deposited particle fine material, and the spherical particles are tightly combined with other materials on the periphery.
Claims (10)
1. A high-strength cementing material based on fine particle sludge is characterized by comprising the following components in parts by weight: 150-200 parts of cement, 80-120 parts of modified spherical granular materials, 40-70 parts of deposited granular coarse materials, 24-28 parts of silicon powder, 23-27 parts of fly ash, 11-14 parts of ultrafine powder, 20-25 parts of steel fibers, 5-10 parts of latex powder, 6-7 parts of a water reducing agent and 21-24 parts of water;
the modified spherical particle material is prepared by the following method: heating and melting the base material, adding the deposited fine granular material, stirring uniformly to obtain mixed slurry, performing spray granulation on the mixed slurry by using high-speed airflow in the outflow process, drying, vibrating and sieving to obtain the high-performance composite material.
2. The fine particle sludge-based high strength cement of claim 1, comprising the following components in parts by weight: 150 parts of cement, 110 parts of modified spherical particles, 60 parts of deposited particle coarse materials, 25 parts of silicon powder, 26 parts of fly ash, 14 parts of superfine powder, 23 parts of steel fiber, 8 parts of latex powder, 7 parts of water reducing agent and 23 parts of water.
3. A high strength cementitious binder based on fine particle sludge as claimed in claim 1 wherein the volume ratio of matrix material to sludge particle fines is 2-4.
4. The high strength cement based on fine particle sludge as claimed in any one of claims 1 to 3, wherein the matrix material is made of polycarbonate and asphalt mixed in a volume ratio of 1.
5. A high strength cementitious binder based on fine particle sludge as claimed in any of the claims 1-3 wherein the size of the sludge particle fines is 20-60 μm and the sludge content of the sludge particle fines is 8-12%.
6. A high strength cementitious binder based on fine particle sludge as claimed in claim 1 wherein the high velocity gas flow has a gas flow rate of more than 850m/s and a gas temperature of less than 120 ℃.
7. A high strength cementitious binder based on fine particle sludge as claimed in claim 1 or 2 wherein the size of the sludge particles is 80-180 μm and the size of the modified spherical particles is 200-500 μm.
8. The high strength cement based on fine particle sludge as claimed in claim 1 or 2, wherein the particle size of the silicon powder is 0.2-0.5 μm and the fineness of the ultra fine powder is 1-10 μm.
9. A high strength cementitious binder based on fine particle sludge as claimed in claim 1 or 2 wherein the steel fibres have a length of 10-15mm, a diameter of 0.15-0.30mm and a tensile strength greater than 2800MPa.
10. The method for preparing a fine particle sludge based high strength cementitious binder according to any one of claims 1 to 9, characterized by comprising the steps of:
(1) Uniformly mixing the modified spherical particle material, the deposited coarse particle material, the steel fiber and the latex powder;
(2) Pouring silicon powder, fly ash, ultrafine powder and cement into the mixture, and continuously mixing uniformly to obtain a mixture;
(3) And adding water and a water reducing agent into the mixture, and uniformly mixing to obtain the water reducing agent.
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