CN112551987B - Preparation method for quickly recycling over-wet soft soil into light filling soil - Google Patents
Preparation method for quickly recycling over-wet soft soil into light filling soil Download PDFInfo
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- CN112551987B CN112551987B CN202011543012.0A CN202011543012A CN112551987B CN 112551987 B CN112551987 B CN 112551987B CN 202011543012 A CN202011543012 A CN 202011543012A CN 112551987 B CN112551987 B CN 112551987B
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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 Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for quickly converting over-wet soft soil into light filling soil, which comprises the following steps: firstly, 5-15% of waste tire rubber powder and 3-8% of high-molecular water-absorbing resin are prepared into high-water-absorbing rubber particles with certain strength by a physical blending method, and the particle size of the particles is not more than 0.25 mm. And mixing and stirring the over-wet soft soil and the high water absorption rubber particles to change the distribution of pore water in a soil body, quickly reducing the water content of the over-wet soft soil to be close to the optimal water content to form light soil with good compactibility, then mixing and stirring the cementing material and the light soil to form light filling soil, and paving and rolling the light filling soil for roadbed filling. The invention realizes the resource utilization of the over-wet soft soil. The method is simple and convenient in construction, can quickly utilize excavated soft soil in a recycling manner, and has the advantages of short construction period, good engineering effect, and good economic benefit and environmental benefit.
Description
Technical Field
The invention belongs to a waste soil recycling technology, and particularly relates to a preparation method for quickly recycling over-wet soft soil into light filling soil, which is suitable for processing and utilizing the excavated over-wet soft soil in various construction projects.
Background
With the continuous development of economy in China, large-scale infrastructure is still in progress. In the process of national infrastructure, more excavated earthwork is often encountered, and much over-wet soft soil is found in the excavated earthwork, namely the general water content is higher (the water content is not less than 40%), and the characteristics of high content of clay particles and organic matters, low permeability coefficient and the like exist, the compaction characteristics, the strength and the like of the earthwork are difficult to meet the engineering requirements, and the earthwork is often discarded. With the increasing of the ecological environment protection strength of China in recent years, the problem that the excavated waste soil is placed everywhere and the problem that the backfill soil source is tense exist. The problem can be solved by carrying out resource utilization on excavated earthwork, but the method for processing and utilizing over-wet soft soil still has some defects, the strength of the soft soil can be improved by the solidified soil technology, but the requirements of roadbed filling and compaction are still difficult to meet after the solidification processing under the condition that the water content of the soft soil is higher (40-60%), if the water content of the soft soil is reduced to be close to the optimal water content suitable for filling, natural air drying procedures such as piling and airing are often required, the time consumption is long, the efficiency is low, and the excavation earthwork needs to be repeatedly aired and is easily influenced by weather.
In addition, with the rapid development of the automobile industry in China, a large amount of waste tires need to be treated every year, the waste tires are called black pollution, and serious environmental problems and resource waste are caused when the waste tires are not treated properly. The soil modifier is used in roadbed filling, can improve the mechanical property of soil body, can solve the pollution problem, and has good social, economic and environmental benefits.
In summary, in order to treat the over-wet soft soil excavated in the construction engineering and then use the treated over-wet soft soil for roadbed filling, the invention of a preparation method for quickly recycling the over-wet soft soil into light filling soil is needed. The over-wet soft soil can quickly reduce water and improve compactibility in a short period, and simultaneously, the density of the soil body is reduced, so that the light filling soil with both strength and compactibility is formed.
Disclosure of Invention
The invention aims to provide a preparation method for rapidly converting over-wet soft soil into light filling soil, which can accelerate the curing process of the over-wet soft soil, improve the curing effect of the over-wet soft soil, rapidly convert excavated soft soil into the light filling soil with high strength and good compactibility for roadbed filling and realize the recycling of waste over-wet soft soil and waste tires.
In order to achieve the above object, the present invention provides the following technical solutions:
a preparation method for rapidly recycling over-wet soft soil into light filling soil comprises the following steps:
step 1) removing impurities in the over-wet soft soil excavated in the construction engineering, and transporting the over-wet soft soil to the side of a roadbed filling position.
And 2) preparing the waste tire rubber powder and the high-molecular water-absorbing resin into high-water-absorbing rubber particles with strength by a physical blending method, wherein the particle size of the particles is not more than 0.25 mm.
And 3) mixing the high water absorption rubber particles into the excavated over-wet soft soil, fully stirring, standing for 1-2 d (days), wherein the high water absorption rubber particles can quickly absorb pore water in the soil body and reduce the thickness of a combined water film, so that the compactibility of the soil body is improved.
And 4) paving the mixture soil body above the roadbed, adding a cementing material, and uniformly mixing to form the light filling soil.
And 5) rolling and compacting the light filling soil by using a compacting machine.
The light filling soil comprises the following raw materials in parts by mass: 75-85% of over-wet soft soil, 5-15% of waste tire rubber powder, 3-8% of high-molecular water-absorbing resin and 3-8% of cementing material, wherein the total amount is 100%.
The impurities are plant roots, organic matters and stones with the grain size larger than 5 cm.
Preferably, the over-wet soft soil is excavated soft soil with the water content of 40-60%, the waste tire rubber powder is powder particles obtained by crushing waste tires and removing steel wires, and the cementing material is at least one of an inorganic stabilizer and a geopolymer material.
Preferably, the excavated soft soil is silt, clay or silty clay, the inorganic stabilizer is cement or lime, and the geopolymer material is slag micro powder or fly ash.
Preferably, the particle size of the waste tire rubber powder is 0.125-0.25 mm (60-120 meshes).
Preferably, the polymer resin has a water absorption capacity of 500 to 2000 times and a particle diameter of not more than 50 μm.
Drawings
Fig. 1 is a preparation flow chart of the method for rapidly converting over-wet soft soil into light filling soil.
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings and specific embodiments.
Example 1
In the embodiment, the over-wet soft soil is selected from Nanjing City of Jiangsu province, the water content is 45 wt.%, the liquid limit is 41%, the plastic limit is 17%, the plasticity index is 24, and the natural density is 1.91g/cm 3 Maximum dry density of 1.78g/cm 3 Optimum moisture content 15.5 wt.%. The waste tire rubber powder is purchased from Guangdong rubber industry (Nanjing) Co., Ltd, and the high molecular water-absorbing resin is purchased from Nanjing Saipu high molecular material Co., Ltd. The cementing material is conch brand 425 portland cement, purchased from Nanjing conch cement Co.
In the embodiment, the raw material proportion for rapidly resourcing the over-wet soft soil into the light filling soil is as follows according to the mass proportion: 80% of over-wet soft soil, 10% of waste tire rubber powder, 5% of high molecular water-absorbing resin and 5% of cementing material, namely each light filling soil comprises: 1500kg of over-wet soft soil, 180kg of waste tire rubber powder, 90kg of high-molecular water-absorbent resin and 90kg of 425 cement.
Based on the preparation method for rapidly recycling the over-wet soft soil into the light filling soil, the preparation process is shown in figure 1, and the steps are as follows:
step 1) removing plant roots and the like in the over-wet soft soil, and transporting the over-wet soft soil to the side of a roadbed filling position;
step 2) mixing the waste tire rubber powder and the high-molecular water-absorbing resin, putting the mixture into a mixing roll for mixing and molding, and then preparing high-water-absorbing rubber particles with the particle size of not more than 0.25mm in a rubber crusher;
step 3) placing the high water absorption rubber particles and the over-wet soft soil in a fixed mixing plant (or a mobile road mixer), uniformly stirring the two materials by using forced stirring equipment until the mixture is uniform in color and does not agglomerate, and then standing for 1d, wherein the high water absorption rubber particles can rapidly absorb pore water in a soil body and reduce the thickness of a binding water film, so that the compactibility of the soil body is improved;
step 4) paving the mixture soil body above the roadbed, doping cement into the mixture, fully stirring the mixture by using a stirring machine or a BMW machine, and standing for 2d to form light filling soil;
and 5) rolling and compacting the light filling soil by using a road roller, so that the purpose that the over-wet soft soil is solidified into high-strength light filling soil for roadbed filling after the moisture content is reduced and the compactibility is improved is realized.
Comparative example 1
The difference from example 1 is that the used tire rubber powder and the water absorbent polymer resin were not blended.
The performance of the over-wet soft soil fast resource filling soil prepared in the embodiment and the comparative example 1 is compared, and the data are as follows:
| 28d unconfined compressive strength/kPa | CBR/% after 28d curing | Degree of compaction after milling% | Dry density/g/cm after rolling 3 | |
| Example 1 | 1047 | 28 | 94 | 1.43 |
| Comparative example 1 | 639 | 11 | 85 | 1.56 |
It can be seen from the comparative data that the waste tire rubber powder and the high-molecular water-absorbent resin are not doped, the over-wet soft soil cannot be compacted to more than 90%, and therefore the over-wet soft soil cannot be applied to roadbed filling, after the waste tire rubber powder and the high-molecular water-absorbent resin are added, the high-molecular water-absorbent resin can absorb pore water, the thickness of a pore water combined water film between soil particles is reduced, the soil compactness is improved, the compactness can reach 94%, and the over-wet soft soil can be applied to roadbed filling. In addition, the high water absorption rubber particles formed by mixing the high polymer water absorption resin and the waste tire rubber particles have reduced water absorption capacity, but the rubber particles have higher strength, and the combination of the high polymer water absorption resin and the waste tire rubber particles can maintain higher overall strength, so that the strength after curing in example 1 is obviously higher than that in comparative example 1.
According to the preparation method for rapidly converting the over-wet soft soil into the light filling soil, the high water absorption rubber particles prepared from the high-molecular water absorption resin and the waste tire rubber powder are added into the over-wet soft soil with high water content, so that the water content of the over-wet soft soil can be rapidly reduced, and rapid precipitation and rapid construction can be realized. According to the invention, the high-molecular water-absorbing resin in the high-water-absorbing rubber particles absorbs pore water, and the rubber particles in the high-water-absorbing rubber particles have higher strength and durability than single high-molecular resin. After the cementing material is added, pore water in soil is further consumed, the high-molecular water-absorbing resin can release a part of water, the cementing material connects and solidifies soil particles and high-water-absorbing rubber particles, and the high-strength light filling soil with high compactness and small density is formed after rolling.
The above-mentioned embodiments do not limit the technical solutions of the present invention in any way, and all technical solutions obtained by using equivalent substitution or equivalent transformation fall within the protection scope of the present invention.
Claims (8)
1. A preparation method for quickly resourcing over-wet soft soil into light filling soil is characterized by comprising the following steps:
step 1) removing impurities in over-wet soft soil excavated in construction engineering, and transporting the over-wet soft soil to a roadbed filling position;
step 2) preparing the waste tire rubber powder and the high-molecular water-absorbing resin into high-water-absorbing rubber particles with strength by a physical blending method, wherein the particle size of the particles is not more than 0.25 mm;
step 3) mixing the high water absorption rubber particles into the excavated over-wet soft soil, fully stirring, standing for 1-2 days, enabling the high water absorption rubber particles to quickly absorb pore water in a soil body, reducing the thickness of a binding water film, improving the compactibility of the soil body, and obtaining a mixture soil body;
step 4), paving the mixture soil body above the roadbed, adding a cementing material, and uniformly mixing to form light filling soil;
step 5), rolling and compacting the light filling soil by using a compacting machine;
the light filling soil comprises the following raw materials in parts by mass: 75-85% of over-wet soft soil, 5-15% of waste tire rubber powder, 3-8% of high-molecular water-absorbing resin and 3-8% of cementing material, wherein the total amount is 100%;
the over-wet soft soil is excavated soft soil with the water content of 40-60%.
2. The preparation method for rapidly resourcing over-wet soft soil into light filling soil according to claim 1, characterized by comprising the following steps: the excavated soft soil is silt, clay or silty clay.
3. The preparation method for rapidly resourcing over-wet soft soil into light filling soil according to claim 1, characterized by comprising the following steps: the waste tire rubber powder is powder particles obtained by crushing waste tires and removing steel wires, and the particle size is 0.125-0.25 mm.
4. The preparation method for rapidly resourcing over-wet soft soil into light filling soil according to claim 1, characterized by comprising the following steps: the water absorption rate of the polymer resin is 500-2000 times, and the particle size is not more than 50 mu m.
5. The preparation method for rapidly resourcing over-wet soft soil into light filling soil according to claim 1, characterized by comprising the following steps: the cementing material is at least one of an inorganic stabilizer and a geopolymer material.
6. The preparation method for rapidly converting over-wet soft soil into light filling soil according to claim 5, wherein the preparation method comprises the following steps: the inorganic stabilizer is cement or lime.
7. The preparation method for rapidly converting over-wet soft soil into light filling soil according to claim 5, wherein the preparation method comprises the following steps: the geopolymer material is slag micro powder or fly ash.
8. The preparation method for rapidly resourcing over-wet soft soil into light filling soil according to claim 1, characterized by comprising the following steps: the impurities are plant roots, organic matters and stones with the grain size larger than 5 cm.
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| CN114351526B (en) * | 2021-12-27 | 2023-03-03 | 湖南省西湖建筑集团有限公司 | Soft soil roadbed structure system and construction method |
| CN115745515B (en) * | 2022-11-23 | 2023-09-12 | 安徽理工大学 | Preparation method of waste rubber cement soil |
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