CN110590202A - Rock soil reinforcing agent prepared based on coal flue gas desulfurization byproducts - Google Patents
Rock soil reinforcing agent prepared based on coal flue gas desulfurization byproducts Download PDFInfo
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- CN110590202A CN110590202A CN201910946748.3A CN201910946748A CN110590202A CN 110590202 A CN110590202 A CN 110590202A CN 201910946748 A CN201910946748 A CN 201910946748A CN 110590202 A CN110590202 A CN 110590202A
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- China
- Prior art keywords
- reinforcing agent
- rock
- soil
- flue gas
- gas desulfurization
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- 239000002689 soil Substances 0.000 title claims abstract description 89
- 239000012744 reinforcing agent Substances 0.000 title claims abstract description 54
- 239000011435 rock Substances 0.000 title claims abstract description 48
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 44
- 230000023556 desulfurization Effects 0.000 title claims abstract description 44
- 239000006227 byproduct Substances 0.000 title claims abstract description 26
- 239000003245 coal Substances 0.000 title claims abstract description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000003546 flue gas Substances 0.000 title claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 20
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 17
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 15
- 239000010440 gypsum Substances 0.000 claims abstract description 15
- 239000000654 additive Substances 0.000 claims abstract description 14
- 239000002893 slag Substances 0.000 claims abstract description 14
- 238000010276 construction Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims description 8
- 238000004537 pulping Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 11
- 238000005728 strengthening Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000003756 stirring Methods 0.000 description 10
- 238000001514 detection method Methods 0.000 description 6
- 101100068338 Zymoseptoria tritici (strain CBS 115943 / IPO323) GGS3 gene Proteins 0.000 description 5
- 239000002956 ash Substances 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 101001024910 Gibberella fujikuroi (strain CBS 195.34 / IMI 58289 / NRRL A-6831) Geranylgeranyl pyrophosphate synthase 2 Proteins 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000012779 reinforcing material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 101150077059 TPS1 gene Proteins 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 101150114010 ggs1 gene Proteins 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000003487 anti-permeability effect Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 239000004266 EU approved firming agent Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a rock soil reinforcing agent prepared based on coal flue gas desulfurization byproducts, which is characterized in that 5-25% of coal desulfurization byproducts are used as a rock soil reinforcing and strengthening main component, 40-68% of slag powder, 15-40% of cement and 0-5% of additives are added, mixed and stirred uniformly, and the rock soil reinforcing agent is prepared to replace the cement. The coal flue gas desulfurization byproducts are divided into wet desulfurization gypsum and dry desulfurization ash. Tests show that the strength and the impermeability of the loose rock-soil body reinforced by the prepared rock-soil reinforcing agent are obviously superior to the cement reinforcing effect. The reinforcing agent has the social benefits of environmental protection, safety and reliability, can reduce the construction cost, and has great economic value.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a material for reinforcing weak rock soil, supporting a foundation pit and treating a foundation.
Background
In recent years, the materials for reinforcing soft rock-soil mass, supporting foundation pit, waterproof curtain and treating foundation have been upgraded to special soil firming agents from the original single materials such as lime, cement and fly ash.
The desulfurization in the coal process is a necessary link for the environmental protection requirements of the steel industry, the chemical industry, the heat supply industry and the electric power industry at present, the byproducts generated in the desulfurization in the coal combustion process, namely desulfurization ash and desulfurization gypsum, are industrial wastes which need to be treated urgently, and various domestic steel plants, chemical plants and electric power enterprises are all concerned with the research on the resource utilization of industrial wastes at present. Through years of research and development, some products for resource utilization come out, but the utilized coal flue gas desulfurization byproducts only account for about 30% of the total amount, the residual byproducts can only be buried to bring great harm to the environment, and meanwhile, the byproducts cannot be reasonably utilized, and resource waste is also caused.
Disclosure of Invention
The invention aims to provide a rock soil reinforcing agent prepared by recycling coal flue gas desulfurization byproducts. The reinforcing agent is used for replacing cement, the strength of a reinforcing body higher than that of cement reinforcement is obtained, the compactness of the reinforcing body is improved, and the problem of treatment of coal flue gas desulfurization byproducts is effectively solved.
The purpose of the invention can be realized by the following technical scheme:
the rock soil reinforcing agent prepared based on the coal flue gas desulfurization byproducts is prepared by taking 5-25% of the coal flue gas desulfurization byproducts as rock soil reinforcing and enhancing main components, adding 40-68% of slag powder, 20-40% of ordinary portland cement and 0-5% of additives, mixing and stirring uniformly, and preparing the rock soil reinforcing agent to replace cement to be used as a cementing material for reinforcing weak soft and breakable rock soil.
The coal flue gas desulfurization byproduct is wet desulfurization gypsum, and the proportion of the wet desulfurization gypsum doped into the reinforcing agent is 5-15%.
The wet desulfurization gypsum is prepared into micro powder after being completely dehydrated, and the reinforcing agent is prepared after slag powder, cement and additives are mixed.
The wet desulfurization gypsum contains 10-15% of water, slag powder, cement and additives are added in the slurry making process on the construction site, and the mixture is stirred and mixed uniformly to prepare the reinforcing agent slurry.
The coal flue gas desulfurization byproduct is dry desulfurization ash, the proportion of the dry desulfurization ash doped into the reinforcing agent is 15-25%, and the dry desulfurization ash, the slag powder, the cement and the additive are mixed and stirred uniformly to prepare the reinforcing agent.
The slag powder is S95-grade granulated blast furnace slag powder, the specific surface area is more than 220m2/kg, and the 28d activity index is more than 95%.
The additive is an additive for improving the performance of reinforcing rock and soil.
The invention has the beneficial effects that: compared with the traditional cement, the rock-soil reinforcing material provided by the invention has the advantages that the coring rate and integrity of the reinforced soft rock-soil body are obviously improved, the unconfined compressive strength is obviously enhanced, the impermeability is good, the rock-soil reinforcing material can completely replace the cement, and the rock-soil reinforcing material can be applied to reinforcing the soft rock-soil body to form a compact waterproof curtain body.
The rock soil reinforcement material provided by the invention adopts coal to produce byproducts which are solid wastes in industries such as steel, chemical industry, heat supply, electric power and the like, has the characteristics of environmental protection and the like, is extremely low in energy consumption in the preparation process, very small in environmental pollution and low in cost, can effectively reduce the cost of soft rock soil reinforcement, and has remarkable social and economic benefits.
Drawings
FIG. 1 is a schematic diagram of a process for preparing a rock soil reinforcing agent from desulfurized gypsum powder based on a wet method.
FIG. 2 is a schematic diagram of a process for preparing a rock soil strengthening agent from desulfurized gypsum based on a wet method.
FIG. 3 is a schematic diagram of a process for preparing a rock soil reinforcing agent by using desulfurized ash based on a dry method.
Detailed Description
The invention will now be further illustrated by reference to the following examples:
example 1 preparation of rock soil strengthening agent GGS1 based on Wet flue gas desulfurization Gypsum powder and testing of strengthened soil
The concrete mixture ratio of the soft rock soil reinforcing agent GGS1 is as follows:
the components are fully stirred and uniformly mixed to prepare the rock soil reinforcing agent, and the process route is shown in figure 1.
The reinforced solidified soil of the stirring pile is obtained by stirring typical 2-layer silt soil in Taicang region of Jiangsu and a reinforcing agent material.
Stirring by adopting a double-shaft stirring pile on site, pulping, spraying and mixing, and taking a core and sampling for detection after 28 days of maintenance.
(1) The unconfined compressive strength detection results of the reinforced soil are shown in the following table 1:
TABLE 1 unconfined compressive strength test results of the reinforced rock and soil samples (maintenance 28 days)
As can be seen from Table 1, after the soil sample is reinforced by the GGS1 rock soil reinforcing agent, the strength of the obtained reinforced soil sample is obviously higher than that of a 42.5-grade ordinary portland cement reinforced soil sample, and the ratio of the unconfined compressive strength of the two cemented material reinforced soil samples in the same age is more than 1.75-2.25. The effect of the water-cement ratio of the reinforcing agent pulping on the strength of the reinforced soil is that the smaller the water-cement ratio is, the higher the strength is. When the rock soil reinforcing agent is used for reinforcing mucky soil, the rock soil reinforcing agent is superior to P.O.42.5-grade ordinary portland cement.
(2) Indoor penetration test
The results obtained by conducting an indoor permeation test on three soil preparation test pieces of the tai bin are shown in table 2:
TABLE 2 Permeability test results of the consolidated soil (maintenance for 28 days)
As can be seen from the table, the permeability coefficients of the rock soil reinforcing agent reinforced soil samples prepared by the method are basically smaller than those of P.O.42.5-grade ordinary portland cement reinforced soil samples. Therefore, the rock soil reinforcing agent of the present invention has an anti-permeability property superior to that of ordinary portland cement from the viewpoint of anti-permeability.
Example 2 rock soil strengthening agent GGS2 prepared based on wet flue gas desulfurization gypsum and testing effect of strengthened soil
The concrete mixture ratio of the rock soil reinforcing agent GGS2 is as follows:
the cement, the S95-grade slag powder and the additive components are fully stirred and uniformly mixed, then the desulfurized gypsum is added in the field pulping process, the rock soil reinforcing agent GGS2 is prepared by uniformly stirring, and the specific preparation process route is shown in figure 2.
And stirring 4 layers of silt soil typical in Shanghai with a reinforcing agent material to obtain the reinforced solidified soil of the stirring pile.
Stirring by using a triaxial stirring pile on site, pulping, spraying and mixing, and taking a core and sampling for detection after 28 days of maintenance.
The unconfined compressive strength detection results of the reinforced soil obtained by coring detection are shown in Table 3
TABLE 3 unconfined compressive strength test results of the reinforced rock and soil samples (maintenance 28 days)
As can be seen from Table 3, the strength of the reinforced soil sample obtained by reinforcing the soil sample by the GGS2 rock reinforcing agent is obviously higher than that of a 42.5-grade ordinary portland cement reinforced soil sample, and the ratio of the unconfined compressive strength of the two cemented material reinforced soil samples in the same age period is more than 1.66-1.89. The effect of the cement-lime ratio of the reinforcing agent pulping on the strength of the reinforced soil is shown as follows: the smaller the water-cement ratio, the higher the strength. When the rock soil reinforcing agent is used for reinforcing mucky soil, the rock soil reinforcing agent is superior to P.O.42.5-grade ordinary portland cement.
Example 3 rock soil strengthening agent GGS3 prepared based on dry desulfurized fly ash and testing effect of strengthened soil
The concrete proportion is as follows:
the preparation process route of the components which are fully stirred and uniformly mixed to prepare the soil and rock reinforcing agent GGS3 is shown in figure 3.
Aiming at the typical 2-layer, 3-layer and 4-layer soil in Shanghai, two reinforcing materials (GGS3 reinforcing agent and P.O.42.5 cement) are added, and the mixture is uniformly stirred to obtain the solidified soil, wherein the adding amount of the reinforcing agent in the solidified soil is 13%, and the water cement ratio of pulping is 1.0. The strength of the reinforced soil was measured by using a room test model of 70.7x70.7x70.7, and maintained for various ages as listed in table 4.
TABLE 4 unconfined compressive strength detection result of indoor reinforced rock and soil sample
As can be seen from Table 4, the GGS3 reinforcing agent reinforced soil has the strength increasing with the increase of age, but the increase after 60 days is not large. Compared with cement as a reinforcing agent, the reinforcing soil strength of the two reinforcing agents is similar in the 7-day age, the reinforcing soil strength of the GGS3 reinforcing agent is only 1 and 15 times of that of the cement, the strength ratio reaches 1.55 times after 28-day curing, and the strength ratio reaches 1.78 times after 90-day curing.
The above description is only an example of the application of the present invention, but the present invention should not be limited to the disclosure of the example. Therefore, it is intended that all equivalents and modifications which do not depart from the spirit of the invention disclosed herein are deemed to be within the scope of the invention.
Claims (7)
1. The rock soil reinforcing agent prepared based on coal flue gas desulfurization byproducts is characterized in that: 5-25% of coal flue gas desulfurization byproducts are used as a rock and soil reinforcement reinforcing main component, 40-68% of slag powder, 20-40% of ordinary portland cement and 0-5% of additives are added and mixed uniformly to prepare a rock and soil reinforcing agent, and the rock and soil reinforcing agent is used as a cementing material for reinforcing weak and broken rock and soil instead of cement.
2. The rock soil reinforcing agent prepared based on coal flue gas desulfurization byproducts as claimed in claim 1, is characterized in that: the coal flue gas desulfurization byproduct is wet desulfurization gypsum, and the proportion of the wet desulfurization gypsum doped into the reinforcing agent is 5-15%.
3. The rock soil reinforcing agent prepared based on coal flue gas desulfurization byproducts as claimed in claim 1, is characterized in that: the wet desulfurization gypsum is prepared into micro powder after being completely dehydrated, and the micro powder is mixed with the slag powder, the cement and the additive and is stirred and mixed uniformly to prepare the rock soil reinforcing agent (powder).
4. The preparation method of the rock soil reinforcing agent prepared based on the coal flue gas desulfurization byproduct as claimed in claim 1, is characterized in that: the wet desulfurization gypsum contains 10-15% of water, slag powder, cement and additives are added in the pulping process of a construction site, and the mixture is stirred and mixed uniformly to prepare the reinforcing agent slurry.
5. The rock soil reinforcing agent prepared based on coal flue gas desulfurization byproducts as claimed in claim 2, wherein: the coal flue gas desulfurization byproduct is dry desulfurization ash, the proportion of the dry desulfurization ash doped into the reinforcing agent is 15-25%, and the dry desulfurization ash, the slag powder, the cement and the additive are mixed and stirred uniformly to prepare the reinforcing agent.
6. The rock soil reinforcing agent prepared based on coal flue gas desulfurization byproducts as claimed in claim 1, is characterized in that: the slag powder is S95-grade granulated blast furnace slag powder, the specific surface area is more than 220m2/kg, and the 28d activity index is more than 95%.
7. The rock soil reinforcing agent prepared based on coal flue gas desulfurization byproducts as claimed in claim 1, is characterized in that: the additive is an additive for improving the performance of the rock-soil reinforced body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910946748.3A CN110590202A (en) | 2019-10-07 | 2019-10-07 | Rock soil reinforcing agent prepared based on coal flue gas desulfurization byproducts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910946748.3A CN110590202A (en) | 2019-10-07 | 2019-10-07 | Rock soil reinforcing agent prepared based on coal flue gas desulfurization byproducts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110590202A true CN110590202A (en) | 2019-12-20 |
Family
ID=68865541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910946748.3A Pending CN110590202A (en) | 2019-10-07 | 2019-10-07 | Rock soil reinforcing agent prepared based on coal flue gas desulfurization byproducts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110590202A (en) |
-
2019
- 2019-10-07 CN CN201910946748.3A patent/CN110590202A/en active Pending
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Application publication date: 20191220 |