CN111410445A - Environment-friendly cementing material and preparation method and application thereof - Google Patents
Environment-friendly cementing material and preparation method and application thereof Download PDFInfo
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- CN111410445A CN111410445A CN202010387846.0A CN202010387846A CN111410445A CN 111410445 A CN111410445 A CN 111410445A CN 202010387846 A CN202010387846 A CN 202010387846A CN 111410445 A CN111410445 A CN 111410445A
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- tuff
- cao
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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
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- 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
-
- 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
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
- C04B2111/00775—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes the composition being used as waste barriers or the like, e.g. compositions used for waste disposal purposes only, but not containing the waste itself
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention particularly relates to an environment-friendly cementing material, a preparation method and an application thereof, wherein the environment-friendly cementing material comprises the following components in percentage by weight: 60-80% of tuff or tuff lava, 5-15% of quicklime, 15-30% of fly ash, 0-2% of sodium hydroxide and 0-2% of desulfurized gypsum, wherein the main component of the tuff or tuff lava is SiO2、Al2O3And CaO, wherein SiO2And Al2O3The mass fraction of the calcium oxide is not less than 75 percent, the main component of the quicklime is CaO, and the mass fraction of the CaO in the quicklime is not less than 80 percent. The volcanic tuff (tuff lava) which is widely distributed in China and low in price is innovatively selected as the main raw material of the modified waste soil, a complete technical system integrating configuration, modification, manufacturing and test is formed, and the differences of the requirements of different projects on the strength of the waste soil and the differences of the waste soil components in different regions can be comprehensively consideredAnd the difference between the natural modified material and the modified garbage soil mechanical parameter value is provided.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to an environmental-friendly cementing material, and a preparation method and application thereof.
Background
Along with the rapid development of modern city construction, the discharge amount of urban domestic garbage is increased, and the accumulation amount of garbage soil generated by the discharge amount is increased. On one hand, the projects of changing and expanding the landfill plants are increased, and on the other hand, along with the continuous expansion of the urban scale, buildings and roads need to be built on the original landfill plants. In order to meet the requirements of the engineering, the engineering properties of the waste soil are known through indoor tests, and the waste soil is modified to a certain extent if necessary, so that the waste soil is further developed and utilized.
The method has the following defects that ① continuously rises along with the vigorous development of national infrastructure, the cement price is continuously increased, the modification cost can be only slightly reduced even if the cement consumption is reduced by the aid of the fly ash, the preparation process of ② cement is complex, a calcination link exists, the method is not beneficial to energy conservation and environmental protection, ③ generally provides a fixed cement mixing amount by virtue of experience, and scientific and reasonable optimal mixing basis is lacked.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an environment-friendly cementing material and a preparation method and application thereof.
To achieve the above objectThe technical scheme adopted by the invention is as follows: an environment-friendly cementing material comprises the following components in percentage by weight: 60-80% of tuff or tuff lava, 5-15% of quicklime, 15-30% of fly ash, 0-2% of sodium hydroxide and 0-2% of desulfurized gypsum, wherein the main component of the tuff or tuff lava is SiO2、Al2O3And CaO, wherein SiO2And Al2O3The mass fraction of the calcium oxide is not less than 75 percent, the main component of the quicklime is CaO, and the mass fraction of the CaO in the quicklime is not less than 80 percent.
Tuff or tuff is volcanic tuff or volcanic tuff, is a kind of well-crystallized rock gradually formed in the long-term natural transportation process after temperature and pressure of volcanic rock slurry are suddenly changed in the spraying and scattering process, and is generally formed by cementing volcanic ash with the granularity smaller than 2 mm.
The preparation method of the environment-friendly cementing material comprises the following steps:
(1) crushing and grinding: respectively processing tuff or tuff lava, quicklime, fly ash, sodium hydroxide and desulfurized gypsum into powder by adopting crushing and grinding processes, and sieving;
(2) and (3) component analysis: respectively analyzing SiO in tuff or tuff lava2、Al2O3And the content of CaO, and the content of CaO in quicklime;
(3) preparing materials: taking 100 parts of tuff or tuff lava, A parts of quicklime, 2A parts of fly ash, 1 part of sodium hydroxide and 1 part of desulfurized gypsum; wherein the calculation formula of A is as follows:
in the formula, A is the part of the raw lime;
and TCaOSiO in tuff or tuff lava respectively2、Al2O3And the mass fraction of CaO; wCaOThe mass fraction of CaO in the quicklime.
Preferably, the powders of each component in step (1) are sieved through a 200 mesh sieve, so that the coarsest powder in each component does not exceed 200 mesh.
Preferably, the tuff or tuff lava in the step (1) is generally used directly, or the tuff or tuff lava is calcined at 800 ℃ before crushing and grinding, wherein it needs to be noted that the performance of the cementing material can be obviously improved after calcination, but the energy-saving and environment-friendly characteristics of the whole cementing material are influenced to a certain extent correspondingly.
Preferably, XRF quantitative analysis is respectively carried out on tuff or tuff lava and quicklime in the step (2), so that SiO in the tuff or tuff lava is obtained2、Al2O3And the content of CaO, and the content of CaO in quicklime.
The application of the environment-friendly cementing material in modified waste soil comprises the following steps:
(1) drilling waste soil of a landfill, adding 50% of water according to the mass, uniformly stirring, placing in a constant temperature and humidity box, and standing for 24 hours;
(2) respectively doping 15%, 25%, 35% and 45% of environment-friendly cementing materials into the waste soil after standing, and uniformly stirring to prepare a waste soil sample;
(3) maintaining the sample in a constant temperature and humidity box for 24 hours, and then removing the mold;
(4) and (4) after the sample is demoulded, placing the sample in a constant temperature and humidity box, curing the sample to the designed age, and then performing a mechanical test.
Preferably, the diameter of the three-opening die used for preparing the sample in the step (2) is 39.1mm, and the height is 80 mm.
Preferably, the temperature of the constant temperature and humidity chamber in the steps (1) and (4) is 20 ℃ and the humidity is 85%.
Preferably, the mechanical test in the step (4) adopts a triaxial compression test method of section 19 in the standard of soil engineering test methods (GB/T50123-2019) to obtain the cohesive force and the internal friction angle of the modified waste soil; or the unconfined compressive strength of the modified waste soil is obtained by adopting the unconfined compressive strength test method in the section 20.
Preferably, the design age in step (4) is 3 days, 7 days, 17 days, 28 days.
The invention innovatively selects the volcanic tuff or the volcanic tuff lava which is widely distributed in China and has low price as the main raw material of the modified garbage soil, and is supplemented with a small amount of quicklime, fly ash, sodium hydroxide and desulfurized gypsum to form the environment-friendly cementing material through reasonable proportioning; mixing the mixing amount of the environment-friendly cementing material with different proportions with the waste soil to prepare a modified waste soil test piece, carrying out strength test to obtain the corresponding relation between the mixing amount and the strength parameter, and giving the optimal mixing amount of the cementing material under the optimal proportioning condition and the corresponding modified waste soil strength parameter.
The invention forms a complete technical system integrating configuration, modification, manufacturing and test, can comprehensively consider the differences of different projects on the strength requirements of the waste soil, the differences of the waste soil components in various regions and the differences of natural modified materials, and provides the most appropriate modification scheme and the corresponding modified mechanical parameter values of the waste soil.
By adopting the scheme, the invention has the following advantages:
(1) in the invention, tuff (tuff lava) is selected as a main modification material for modifying the waste soil, and is widely distributed in China and can be taken nearby around the engineering; tuff (tuff lava) is low in price, and the price of stone powder after mechanical activation is about 1/6 of cement; therefore, the invention can obviously reduce the modification cost.
(2) The environment-friendly cementing material is formed by taking tuff (tuff lava) as a main modified material and adding a small amount of quick lime, fly ash, sodium hydroxide and desulfurized gypsum through reasonable proportioning, and then is mixed with garbage soil, wherein the fly ash and the desulfurized gypsum are byproducts of industrial production and are selected as raw materials of the technology, so that the environment-friendly cementing material has the significance of waste utilization, the tuff (tuff lava) and the quicklime are ground to 200 meshes and can be used for preparation, and the grinding operation of the two raw materials is simple and the energy consumption is low; therefore, the whole modification process has the characteristics of simple operation, low equipment requirement, energy conservation and environmental protection.
(3) The method comprises the steps of firstly detecting raw materials, configuring an optimal environment-friendly cementing material according to a detection result, and finally performing a strength test on the modified waste soil by taking the doping amount of the cementing material as a design variable to obtain a corresponding relation between the doping amount and the strength parameter of the modified waste soil; therefore, the invention can comprehensively consider the differences of raw materials, the waste soil and engineering requirements, and give the optimal doping amount of the cementing material under the optimal proportioning condition and the corresponding strength parameters of the modified waste soil.
Detailed Description
The invention will be better understood from the following examples. However, those skilled in the art will readily appreciate that the specific material ratios, process conditions and results thereof described in the examples are illustrative only and should not be taken as limiting the invention as detailed in the claims.
The experimental methods in the following examples are conventional methods unless otherwise specified, and the experimental reagents and materials involved are conventional biochemical reagents and materials unless otherwise specified.
The invention relates to an environment-friendly cementing material which comprises the following components in percentage by weight: 60-80% of tuff or tuff lava, 5-15% of quicklime, 15-30% of fly ash, 0-2% of sodium hydroxide and 0-2% of desulfurized gypsum, wherein the main component of the tuff or tuff lava is SiO2、Al2O3And CaO, wherein SiO2And Al2O3The mass fraction of the calcium oxide is not less than 75 percent, the main component of the quicklime is CaO, and the mass fraction of the CaO in the quicklime is not less than 80 percent.
The invention relates to a preparation method of an environment-friendly cementing material, which comprises the following steps:
(1) crushing and grinding: respectively processing tuff or tuff lava, quicklime, fly ash, sodium hydroxide and desulfurized gypsum into powder by adopting crushing and grinding processes, and sieving the powder by a 200-mesh sieve;
(2) and (3) component analysis: respectively carrying out XRF (X-ray fluorescence spectroscopy) quantitative analysis on tuff or tuff lava and quicklime so as to obtain SiO in tuff or tuff lava2、Al2O3And CaO content, and green stoneThe content of CaO in the ash;
(3) preparing materials: taking 100 parts of tuff or tuff lava, A parts of quicklime, 2A parts of fly ash, 1 part of sodium hydroxide and 1 part of desulfurized gypsum; wherein the calculation formula of A is as follows:
in the formula, A is the part of the raw lime;
and TCaOSiO in tuff or tuff lava respectively2、Al2O3And the mass fraction of CaO; wCaOThe mass fraction of CaO in the quicklime.
The invention relates to an application of an environment-friendly cementing material in modified garbage soil, which comprises the following steps:
(1) drilling waste soil of a landfill, adding 50% of water according to the mass, uniformly stirring, placing in a constant temperature and humidity box with the temperature of 20 ℃ and the humidity of 85%, and standing for 24 hours;
(2) respectively doping 15%, 25%, 35% and 45% of environment-friendly cementing materials into the settled waste soil, uniformly stirring, and preparing a waste soil sample by adopting a three-die opening die (the diameter is 39.1mm, and the height is 80 mm);
(3) maintaining the sample in a constant temperature and humidity box for 24 hours, and then removing the mold;
(4) after the sample is demoulded, the sample is placed in a constant temperature and humidity box with the temperature of 20 ℃ and the humidity of 85 percent, and is maintained to the designed age (3, 7, 17 and 28 days), and then a mechanical test is carried out.
The mechanical test adopts a triaxial compression test method in section 19 of geotechnical test method standard (GB/T50123-2019) to obtain cohesive force and an internal friction angle of the modified waste soil; or the unconfined compressive strength of the modified waste soil is obtained by adopting the unconfined compressive strength test method in the section 20.
Example one
1. Preparing environment-friendly cementing material
The tuff is obtained from Chalkbrook-time old-fashioned house group, and has the composition shown in Table 1;
TABLE 1 tuff main component
| Composition (I) | SiO2 | Al2O3 | K2O | Na2O | Fe2O3 | CaO | TiO2 | MgO |
| Mass fraction (%) | 77.98 | 11.44 | 7.48 | 1.17 | 1.08 | 0.35 | 0.13 | 0.17 |
The quicklime is from Anyang Minshun calcium industry company, and the components are shown in Table 2;
TABLE 2 quicklime principal Components
| Composition (I) | CaO | SiO2 | SO3 | Al2O3 | Fe2O3 | MgO |
| Mass fraction (%) | 80.72 | 7.72 | 3.21 | 3.00 | 2.45 | 1.49 |
The compounding ratio of the environment-friendly cementing material is shown in Table 3;
table 3 shows the proportions of the obtained environmentally friendly cementitious materials
| Components | Tuff | Quick lime | Fly ash | Sodium hydroxide | Desulfurized gypsum |
| Number of parts | 100 | 8 | 16 | 1 | 1 |
2. Application of environment-friendly cementing material in modified garbage soil
Drilling the degraded and stabilized garbage soil, adding 50% of water according to the mass of the garbage soil, uniformly stirring, placing the garbage soil in a constant-temperature and constant-humidity box with the temperature of 20 ℃ and the humidity of 85%, standing for 24 hours, respectively doping 15%, 25%, 35% and 45% of the cementing materials shown in the table 3, uniformly stirring, preparing a garbage soil sample by adopting three-mould opening (the diameter is 39.1mm, and the height is 80mm), maintaining the sample in the constant-temperature and constant-humidity box for 24 hours, removing the mould, placing the sample in the constant-temperature and constant-humidity box with the temperature of 20 ℃ and the humidity of 85%, maintaining for 28 days, and performing an unconfined compressive strength test on the modified garbage soil, wherein the test result is shown in table 4;
TABLE 4 unconfined compressive strength of modified waste soil at different blending amounts
| Mixing amount | 15％ | 25％ | 35％ | 45％ |
| Maintenance period (day) | 28 | 28 | 28 | 28 |
| Unconfined compressive strength (kPa) | 80 | 115 | 251 | 308 |
As can be seen from the results in Table 4, the unconfined compressive strength of the modified waste soil increases gradually after 28 days along with the gradual increase of the doping amount of the environment-friendly cementing material in the waste soil.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (10)
1. An environment-friendly cementing material comprises the following components in percentage by weight: 60-80% of tuff or tuff lava, 5-15% of quicklime, 15-30% of fly ash, 0-2% of sodium hydroxide and 0-2% of desulfurized gypsum, wherein the main component of the tuff or tuff lava is SiO2、Al2O3And CaO, wherein SiO2And Al2O3The mass fraction of the calcium oxide is not less than 75 percent, the main component of the quicklime is CaO, and the mass fraction of the CaO in the quicklime is not less than 80 percent.
2. A method for preparing the environment-friendly cementing material of claim 1, which is characterized in that: the method comprises the following steps:
(1) crushing and grinding: respectively processing tuff or tuff lava, quicklime, fly ash, sodium hydroxide and desulfurized gypsum into powder by adopting crushing and grinding processes, and sieving;
(2) and (3) component analysis: respectively analyzing SiO in tuff or tuff lava2、Al2O3And the content of CaO, and the content of CaO in quicklime;
(3) preparing materials: taking 100 parts of tuff or tuff lava, A parts of quicklime, 2A parts of fly ash, 1 part of sodium hydroxide and 1 part of desulfurized gypsum; wherein the calculation formula of A is as follows:
in the formula, A is the part of the raw lime;
and TCaOSiO in tuff or tuff lava respectively2、Al2O3And the mass fraction of CaO; wCaOThe mass fraction of CaO in the quicklime.
3. The method for preparing environment-friendly cementing material according to claim 2, characterized in that: and (2) sieving the powder of each component in the step (1) by a 200-mesh sieve to ensure that the coarsest powder in each component does not exceed 200 meshes.
4. The method for preparing environment-friendly cementing material according to claim 2, characterized in that: before the step (1), tuff or tuff lava can be calcined at 800 ℃.
5. According to claim2, the preparation method of the environment-friendly cementing material is characterized by comprising the following steps: respectively carrying out XRF quantitative analysis on tuff or tuff lava and quicklime in step (2), thereby obtaining SiO in the tuff or tuff lava2、Al2O3And the content of CaO, and the content of CaO in quicklime.
6. The use of the environmentally friendly cementitious material of claim 1 in modifying waste soils.
7. The application of the environment-friendly cementing material in modified waste soil according to claim 6, is characterized in that: the method comprises the following steps:
(1) drilling waste soil of a landfill, adding 50% of water according to the mass, uniformly stirring, placing in a constant temperature and humidity box, and standing for 24 hours;
(2) respectively doping 15%, 25%, 35% and 45% of environment-friendly cementing materials into the waste soil after standing, and uniformly stirring to prepare a waste soil sample;
(3) maintaining the sample in a constant temperature and humidity box for 24 hours, and then removing the mold;
(4) and (4) after the sample is demoulded, placing the sample in a constant temperature and humidity box, curing the sample to the designed age, and then performing a mechanical test.
8. The application of the environment-friendly cementing material in modified waste soil according to claim 7, is characterized in that: and (3) preparing the sample in the step (2), wherein the diameter of the three-opening die is 39.1mm, and the height of the three-opening die is 80 mm.
9. The application of the environment-friendly cementing material in modified waste soil according to claim 7, is characterized in that: the temperature of the constant temperature and humidity box in the steps (1) and (4) is 20 ℃, and the humidity is 85%.
10. The application of the environment-friendly cementing material in modified waste soil according to claim 7, is characterized in that: and (4) obtaining the cohesive force and the internal friction angle of the modified garbage soil or the unconfined compressive strength of the modified garbage soil through a mechanical test in the step (4).
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| CN113983466A (en) * | 2021-11-01 | 2022-01-28 | 中国电力工程顾问集团华东电力设计院有限公司 | Method for treating fly ash by utilizing household garbage-silicon-aluminum material in cooperation with incineration ash |
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