CN113214835A - Soil curing agent for roadbed filling - Google Patents
Soil curing agent for roadbed filling Download PDFInfo
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- CN113214835A CN113214835A CN202110663608.2A CN202110663608A CN113214835A CN 113214835 A CN113214835 A CN 113214835A CN 202110663608 A CN202110663608 A CN 202110663608A CN 113214835 A CN113214835 A CN 113214835A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2103/00—Civil engineering use
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Agronomy & Crop Science (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Mining & Mineral Resources (AREA)
- Architecture (AREA)
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Abstract
The invention discloses a soil curing agent for subgrade filling, which takes three industrial wastes of granulated blast furnace slag, fly ash and carbide slag as raw materials to reinforce Taizhou mucky soil with the water content of not less than 50 percent and the organic matter content of not less than 3 percent, so that the Taizhou mucky soil meets the requirements of the strength and the stability of subgrade filling. The invention discloses a construction method for solidifying mucky soil by a soil solidifying agent. The curing agent disclosed by the invention combines three industrial wastes together in a proper proportion, and plays roles in strength and stability through a volcanic ash reaction. The curing agent of the invention can solve the problem that a large amount of mucky soil is piled everywhere in Taizhou, can also solve the problem that the industrial waste materials polluting soil bodies, air and water bodies in industrial production can not be directly utilized, and simultaneously saves roadbed earthwork.
Description
Technical Field
The invention relates to a soil stabilizer for roadbed filling, belonging to the technical field of building materials.
Background
In coastal areas and districts along rivers and lakes in China, mucky soil is widely distributed through long and complex geological evolution. The mucky soil is derived from the engineering of land reclamation from the sea and from undeveloped tidal flat resources. The mucky soil is mainly characterized by three high and two low, namely high water content, high pore ratio, high compressibility, low strength and low permeability, wherein the pore ratio is generally between 1 and 1.5, and the water content is higher than the liquid limit, and belongs to one of cohesive soil. The problems of environment pollution, urban space occupation and high transportation cost are caused by the stacking of a large amount of mucky soil caused by river channel dredging and engineering excavation. Generally, the mechanical property of the mucky soil is poor, the mucky soil cannot be directly used for engineering construction, and the curing of the mucky soil by a curing agent can be considered to improve the basic property of a soil body.
For the solidification of the mucky soil, the additive can be considered to be doped, and the strength and the stability of the soil body are improved. At present, other mucky soil curing agents mainly use traditional curing materials such as cement, lime and the like as main curing agents, and then some additives capable of improving the physical and mechanical properties of the curing soil are added, but the addition of the materials has a large expense and easily causes environmental pollution in the production process. If the industrial waste is used as a raw material of the curing agent, the waste is changed into valuable, so that the production cost of the curing agent can be reduced, the project progress can be accelerated on the whole, and the problem that the industrial waste pollutes the atmosphere and biosphere can be solved. It is considered that only industrial waste is doped into the muddy soil to improve the strength and stability of the solidified soil.
With the improvement of comprehensive strength and the quality of life of residents in China, the domestic demand for highway construction is continuously increased. The construction of highway subgrade usually needs a large amount of earthwork meeting the conditions of strength and water stability, which is a little expense, and the silt solidified soil is a good choice. The mucky soil solidified by the curing agent can be applied to filling of highway subgrade, so that the problem of earthwork shortage can be solved, and the problem that the mucky soil cannot be directly utilized can also be solved.
In view of the above, the invention develops the mucky soil curing agent taking industrial waste as the raw material, is used for roadbed filling, can solve the problem that a large amount of mucky soil in the Zhejiang beach area cannot be used, can reasonably utilize the industrial waste which pollutes the environment and occupies a large area, saves roadbed earthwork, and conforms to the concept of national sustainable development.
Disclosure of Invention
Aiming at the problems of no place for piling up mucky soil, incapability of directly utilizing industrial waste, insufficient strength of roadbed soil and the like, the invention provides a soil curing agent for roadbed filling and a construction method for curing the mucky soil thereof.
The invention is realized by the following technical scheme:
the invention provides a soil stabilizer for roadbed filling, which is prepared from three industrial wastes of granulated blast furnace slag, fly ash and carbide slag as raw materials in parts by weight: 30-50 parts of granulated blast furnace slag, 10-20 parts of fly ash and 30-50 parts of carbide slag.
Preferably, the soil stabilizer provided by the invention comprises the following raw materials: 42 parts of granulated blast furnace slag, 12 parts of fly ash and 46 parts of carbide slag.
The granulated blast furnace slag mainly provides raw materials for volcanic ash reaction, has smaller particles than cement and larger specific surface area, can react more fully and exert activity, and mainly comprises the following mineral components: not less than 46 parts of silicon dioxide, not less than 35 parts of calcium oxide and not less than 5 parts of aluminum trioxide.
The fly ash has the volcanic ash activity but has no gelatinization, is mainly matched with blast furnace slag to carry out volcanic ash reaction, and comprises the following main mineral components: not less than 58 parts of silicon dioxide, not less than 2 parts of calcium oxide and not less than 30 parts of aluminum trioxide.
The carbide slag provides alkaline components for volcanic ash reaction, ensures the activity of blast furnace slag and fly ash, and comprises the following main mineral components: the content of calcium oxide is not less than 65 parts.
The water content of the Taizhou mucky soil solidified by the soil stabilizer is not less than 50 percent, and the organic matter content is not less than 3 percent.
The invention also provides a construction method for solidifying the mucky soil based on the soil solidifying agent, which comprises the following steps:
step 1: taking a soil yard to stew a proper amount of quicklime for 3-4 days, and reducing the water content of the mucky soil to 30% -40%;
step 2: mixing the treated mucky soil with a soil curing agent according to the proportion of 85: 15, and naturally curing for 1-2 days;
and step 3: conveying the solidified soil to a roadbed filling site, rolling and forming, wherein the water content of the surface of the soil body is not lower than 30% in the process, and the curing is carried out for 28d and the inspection and acceptance are achieved.
The invention relates to a soil curing agent for roadbed filling, the curing mechanism of the soil curing agent is mainly volcanic ash reaction, and the soil curing agent is mainly expressed as follows: ca (OH) formed by hydration2Increasing pH value of soil, eroding active mineral component in clay, dissolving Si and Al in clay mineral in liquid phase, Ca (OH)2Further reacting with soluble Si and Al in soil to generate hydrated cementitious substances of Calcium Silicate Hydrate (CSH) and Calcium Aluminate Hydrate (CAH); in addition, a curing agentSiO in active substances2And Al2O3Or with the Ca (OH) remaining in the solidified soil2The reaction is carried out to generate cementitious substances such as Calcium Silicate Hydrate (CSH), Calcium Aluminate Hydrate (CAH) and the like, and the strength of the solidified soil is further improved.
The invention has the following beneficial effects:
1. the soil stabilizer provided by the invention is prepared from industrial waste materials, has wide raw material sources and low cost, has great economic and environmental benefits, and conforms to the concept of sustainable development in China.
2. As can be seen from the data of comparative examples 1-6, compared with the two-ash soil and other proportioning firming agents, the soil firming agent solidified soil of the invention has higher unconfined compressive strength, better water stability and better economy, and can meet the requirement of highway subgrade filling.
3. The curing mechanism of the soil curing agent is volcanic ash reaction, and the hydrated calcium silicate and the hydrated calcium aluminate generated by the reaction can obviously improve the strength and the stability of the mucky soil and solve the problem of poor performance of the roadbed soil.
4. The invention has the advantages of simple construction process for curing the mucky soil, convenient operation, lower cost of field and material, more environment-friendly construction process, obvious technical, economic and social benefits and great popularization value.
Detailed Description
The invention will be further illustrated with reference to the following specific examples.
The example soil is selected from Taizhou silt soft soil, and three industrial wastes of blast furnace slag, fly ash and carbide slag are taken from a certain factory in Zhejiang. Example unconfined compressive strength at age 28d was measured by an electronic universal tester according to the standard geotechnical test specifications for indoor use, and was a standard cylindrical sample with a diameter of 39.1mm and a height of 80 mm. The content of the soil stabilizer in the examples is 15% by mass. To obtain the preferred curing agent at the optimum loading of the curing material, an example analysis of the curing agent formulation was performed.
Example 1
In the implementation, the curing material comprises the following components in parts by weight: 30 parts of blast furnace slag, 20 parts of fly ash and 50 parts of carbide slag, and the detection results are shown in table 1.
Example 2
In the implementation, the curing material comprises the following components in parts by weight: 50 parts of blast furnace slag, 20 parts of fly ash and 30 parts of carbide slag, and the detection results are shown in table 1.
Example 3
In the implementation, the curing material comprises the following components in parts by weight: 45 parts of blast furnace slag, 15 parts of fly ash and 40 parts of carbide slag, and the detection results are shown in table 1.
Example 4
In the implementation, the curing material comprises the following components in parts by weight: 40 parts of blast furnace slag, 15 parts of fly ash and 45 parts of carbide slag, and the detection results are shown in table 1.
Example 5
In the implementation, the curing material comprises the following components in parts by weight: 40 parts of blast furnace slag, 10 parts of fly ash and 50 parts of carbide slag, and the detection results are shown in table 1.
Example 6
In the implementation, the curing material comprises the following components in parts by weight: 50 parts of blast furnace slag, 10 parts of fly ash and 40 parts of carbide slag, and the detection results are shown in table 1.
Example 7
In the implementation, the curing material comprises the following components in parts by weight: 42 parts of blast furnace slag, 12 parts of fly ash and 46 parts of carbide slag, and the detection results are shown in Table 1.
Table 1 embodiment of soil stabilizer for roadbed filling
As can be seen from Table 1, the unconfined compressive strength of example 7 is the highest, and the unconfined compressive strength of 28d can reach 1479.32kPa, which is far higher than the strength requirement of roadbed soil filling, so that the formula of the curing agent in example 7 is selected as a preferred formula, and the roadbed soil is cured and filled according to the following construction flow:
step 1: taking a soil yard to stew a proper amount of quicklime for 3-4 days, and reducing the water content of the mucky soil to 30% -40%;
step 2: the treated mucky soil was mixed in situ with the soil conditioner described in example 7 according to a ratio of 85: 15, and naturally curing for 1-2 days;
and step 3: conveying the solidified soil to a roadbed filling site, rolling and forming, wherein the water content of the surface of the soil body is not lower than 30% in the process, and the curing is carried out for 28d and the inspection and acceptance are achieved.
In order to compare the performance difference of the soil cured by the curing agent and the traditional lime curing agent and verify the pavement performance of the soil cured by the curing agent, a series of comparative example analysis needs to be carried out. In the comparative case, the water stability coefficient is the ratio of the unconfined compressive strength measured after the sample is soaked in water for 24 hours one day before the sample is maintained to the age to the strength measured during the normal maintenance to the age, and the comprehensive price is obtained after researching the market conditions in Zhejiang. In addition, to compare the performance differences of the claimed incorporated stabilized soils and the claimed incorporated stabilized soils, a series of comparative example analyses were performed.
Comparative example 1
In the implementation, the curing agent is a lime curing agent, and the curing material comprises the following components in parts by weight: 75 parts of fly ash and 25 parts of lime. The specific test results are shown in Table 2.
Comparative example 2
In this embodiment, the preferred curing agent in embodiment 7 is selected, and the curing material components in parts by weight are as follows: 42 parts of blast furnace slag, 12 parts of fly ash and 46 parts of carbide slag. The specific test results are shown in Table 2.
Comparative example 3
In the implementation, the curing material comprises the following components in parts by weight: 0 part of blast furnace slag, 0 part of fly ash and 100 parts of carbide slag, and the detection results are shown in Table 3.
Comparative example 4
In the implementation, the curing material comprises the following components in parts by weight: 0 part of blast furnace slag, 33 parts of fly ash and 67 parts of carbide slag, and the detection results are shown in Table 3.
Comparative example 5
In the implementation, the curing material comprises the following components in parts by weight: 17 parts of blast furnace slag, 17 parts of fly ash and 66 parts of carbide slag, and the detection results are shown in Table 3.
Comparative example 6
In the implementation, the curing material comprises the following components in parts by weight: 33 parts of blast furnace slag, 33 parts of fly ash and 34 parts of carbide slag, and the detection results are shown in Table 3.
TABLE 2 comparison of Cure soil Performance of Belleville Cure soil with the curative of the present invention
Table 2 shows a comparison of the curing properties of the two-ash cured soil and the cured soil of the present invention. As can be obtained from Table 2, the unconfined compressive strength and water stability of the solidified soil of the invention are better than those of the two-ash solidified soil at the same age, and the comprehensive price is lower, so that the solidified soil provided by the invention can obviously improve the strength and water stability of mucky soil, the solidified soil has better pavement performance, and the solidified soil has better economy.
TABLE 3 Properties of the soil not claimed
Table 3 shows the properties of the solidified soil not included in the claims. As can be seen from Table 3, the unconfined compressive strength of the solidified soil in other mixing ranges is low, and most of the solidified soil cannot meet the strength requirement of the roadbed soil.
It should be understood that these examples and comparative examples are only illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (5)
1. The soil stabilizer for roadbed filling is characterized in that the raw materials of the soil stabilizer are three industrial wastes of granulated blast furnace slag, fly ash and carbide slag, and the three industrial wastes are calculated according to the parts by weight: 30-50 parts of granulated blast furnace slag, 10-20 parts of fly ash and 30-50 parts of carbide slag.
2. The soil stabilizer of claim 1, wherein the raw material of the soil stabilizer comprises: 42 parts of granulated blast furnace slag, 12 parts of fly ash and 46 parts of carbide slag.
3. The soil stabilizer according to claim 1 or 2, wherein the blast furnace slag has a main mineral composition of: not less than 46 parts of silicon dioxide, not less than 35 parts of calcium oxide and not less than 5 parts of aluminum trioxide; the main mineral components of the fly ash are as follows: not less than 58 parts of silicon dioxide, not less than 2 parts of calcium oxide and not less than 30 parts of aluminum trioxide; the main mineral compositions of the carbide slag are as follows: the calcium oxide is not less than 65 parts.
4. The Taizhou mucky soil cured by the soil conditioner as set forth in claim 1 or 2, wherein the water content is not less than 50% and the organic matter content is not less than 3%.
5. A construction method for solidifying mucky soil with soil solidifying agent according to claim 1 or 2, comprising the steps of:
step 1: taking a soil yard to stew a proper amount of quicklime for 3-4 days, and reducing the water content of the mucky soil to 30% -40%;
step 2: mixing the treated mucky soil in situ with the soil stabilizer of claim 1 or 2 in the ratio of 85: 15, and naturally curing for 1-2 days;
and step 3: conveying the solidified soil to a roadbed filling site, rolling and forming, wherein the water content of the surface of the soil body is not lower than 30% in the process, and the curing is carried out for 28d and the inspection and acceptance are achieved.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114737558A (en) * | 2022-04-07 | 2022-07-12 | 南昌航空大学 | Soft soil shallow layer holding force hard shell layer construction method |
| CN114804807A (en) * | 2022-01-24 | 2022-07-29 | 东方雨虹砂粉科技集团有限公司 | Full-solid-waste soft-base sludge solidified powder and preparation method thereof |
| CN115010450A (en) * | 2022-06-29 | 2022-09-06 | 中国电建集团华东勘测设计研究院有限公司 | Roadbed material prepared from salt-containing sludge and road with salt seepage prevention and control capability |
| CN115448648A (en) * | 2022-10-26 | 2022-12-09 | 山东省路桥集团有限公司 | Construction access road for solidifying and building engineering muck and construction method |
| CN115784701A (en) * | 2023-01-03 | 2023-03-14 | 天津市政工程设计研究总院有限公司 | Self-maintenance type fluid solidified soil composite curing agent and application thereof |
| CN116535140A (en) * | 2023-04-21 | 2023-08-04 | 浙江大学 | Low-carbon roadbed filler for casting residue activated agglomeration engineering dregs and preparation method thereof |
| CN117326842A (en) * | 2023-09-18 | 2024-01-02 | 中国海洋大学 | Solidified contaminated soil and method for filling roadbed by using solidified contaminated soil |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804807A (en) * | 2022-01-24 | 2022-07-29 | 东方雨虹砂粉科技集团有限公司 | Full-solid-waste soft-base sludge solidified powder and preparation method thereof |
| CN114737558A (en) * | 2022-04-07 | 2022-07-12 | 南昌航空大学 | Soft soil shallow layer holding force hard shell layer construction method |
| CN115010450A (en) * | 2022-06-29 | 2022-09-06 | 中国电建集团华东勘测设计研究院有限公司 | Roadbed material prepared from salt-containing sludge and road with salt seepage prevention and control capability |
| CN115448648A (en) * | 2022-10-26 | 2022-12-09 | 山东省路桥集团有限公司 | Construction access road for solidifying and building engineering muck and construction method |
| CN115784701A (en) * | 2023-01-03 | 2023-03-14 | 天津市政工程设计研究总院有限公司 | Self-maintenance type fluid solidified soil composite curing agent and application thereof |
| CN116535140A (en) * | 2023-04-21 | 2023-08-04 | 浙江大学 | Low-carbon roadbed filler for casting residue activated agglomeration engineering dregs and preparation method thereof |
| CN116535140B (en) * | 2023-04-21 | 2024-06-07 | 浙江大学 | Low-carbon roadbed filler for casting residue activated agglomeration engineering dregs and preparation method thereof |
| CN117326842A (en) * | 2023-09-18 | 2024-01-02 | 中国海洋大学 | Solidified contaminated soil and method for filling roadbed by using solidified contaminated soil |
| CN117326842B (en) * | 2023-09-18 | 2024-05-03 | 中国海洋大学 | Solidified contaminated soil and method for filling roadbed by using solidified contaminated soil |
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