CN113442291A - Production process for solidifying and regenerating roadbed filler by sludge muck - Google Patents
Production process for solidifying and regenerating roadbed filler by sludge muck Download PDFInfo
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- CN113442291A CN113442291A CN202110710405.4A CN202110710405A CN113442291A CN 113442291 A CN113442291 A CN 113442291A CN 202110710405 A CN202110710405 A CN 202110710405A CN 113442291 A CN113442291 A CN 113442291A
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- water content
- muck
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- roadbed
- sludge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0418—Wet materials, e.g. slurries
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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
-
- 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
- C04B28/10—Lime cements or magnesium oxide cements
- C04B28/12—Hydraulic lime
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- 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
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a production process of a silt residue soil solidification regeneration roadbed filling material. Determining the dosage of a curing agent according to the grain composition, the plasticity index and the water content of the muck; mixing the mucky muck with a curing agent to realize granulation; turning and maintaining the granules to realize water reduction and granule homogenization; and detecting the water content of the granules, and when the water content of the granules is not higher than the optimal water content + 5%, taking the homogenized granules as the regenerated roadbed filler to finish the production of the regenerated roadbed filler. The production process can directly cure the natural sludge muck without pretreatment links such as drying, crushing, water distribution, fluidization and the like, has less consumption of curing agent and short treatment period, ensures that the regenerated filler is in a loose and compactable powder shape with proper water content and viscosity, is easy to transport and operate on road construction, does not need secondary ash mixing, can directly pave and roll, and meets the requirement of roadbed bearing capacity after compaction.
Description
Technical Field
The invention belongs to a production process of a filler in the field of resource utilization of construction waste, and particularly relates to a production process of a silt muck solidification regeneration roadbed filler.
Background
Mucky soil is widely distributed in the southeast coastal area of China, and is often discarded or subjected to landfill treatment after excavation due to high water content, high viscosity and poor engineering properties. The disposal of the sludge muck not only brings potential safety hazards and environmental pollution, but also provides challenges for daily shortage of land resources. A new disposal way of the muck is searched, the waste is changed into valuable materials for large-batch resource utilization, and the method has great practical significance for the construction of waste-free cities and environment-friendly society.
The protection of natural resources is continuously increased while the output of the mucky dregs is increased year by year, and the construction method for building roads by using natural materials such as sand and stone is not sustainable. In order to solve the dilemma, the roadbed filling is regenerated by using the dregs, and a new solution is undoubtedly provided for the problems.
The silt muck has high initial water content and high content of sticky particles, has large plasticity index, is in a high-viscosity plastic state after being excavated, and cannot be directly compacted for road construction. The silt mucky soil has small permeability, strong water-retaining capacity and difficult tedding and drying, needs to be solidified and regenerated into powder and granular filler, and can realize roadbed filling only by controlling the water content and fully exerting the hardness of the filler.
In the aspect of solidifying (improving) soil to fill roadbed, the related patents disclosed at present have the following limitations:
1. the water content of the processed soil sample is low. For example, the 'double high soil' (high liquid limit and high water content) used in patent CN 108589457A has natural water content of 20-35% which is obviously lower than the liquid limit, and the muddy muck has high water content which is usually above the liquid limit and is generally in the shape of high-viscosity bleeding paste with poor operability;
2. the soil sample has good engineering performance. For example, the gravels soil, silt and silty clay used in patent CN 108892442A and the low liquid limit silt and sand used in patent CN 106049212A have fine particles, high content of clay and poor engineering performance, and are frequently replaced and discarded in construction, so that the material is an unconventional material for road construction.
3. The soil body in a natural state can not be directly treated, and the soil sample needs to be pretreated by drying, crushing, water distribution, fluidization and the like. For example, the method described in patent CN 108046667A requires sprinkling water to prepare dried loess with a water content of 15% to 18%, the method described in patent CN 102584117A requires solarization and precipitation to reduce the water content of natural sludge to below 25%, and the method described in patent CN 109896794A requires drying and pulverizing clay. The pretreatment links increase energy consumption, treatment time and cost, dust generated after soil body drying has negative influence on the environment, and more importantly, the feasibility of pretreatment is greatly reduced when silt muck residue soil with strong water retention capacity and high viscosity is faced.
4. High dosage of curing agent or long treatment period. For example, in patent CN 110436812A, the amount of the solidifying material exceeds 13% of the soil sample, in patent CN 107119521 a, the amount of the cement and lime exceeds 16% of the mass of the soil sample, in patent CN 110593036A, soil is required to be subjected to material sealing for several days, then to digging and airing for several days, and secondary ash mixing treatment is required. These requirements for the amount of curing agent and the processing cycle lead to higher economic investment and construction period.
The limitations make the existing improved soil roadbed filling process difficult to meet the treatment requirement of the mucky muck and the requirement of roadbed engineering, and are not beneficial to practical engineering application and popularization.
Heretofore, no method exists for directly regenerating the natural silt muck into the roadbed filler by using a lower dosage of curing agent in a shorter time without a pretreatment means. Therefore, the method can make up the technical blank of the existing treatment means, can relieve the pressure of waste disposal of the waste soil, can widen the supply way of road engineering materials, is a measure with multiple purposes, and has deep environmental protection significance and great industrialization value.
Disclosure of Invention
The invention aims to provide a production process for solidifying and regenerating roadbed filling by sludge muck. The invention does not need the pretreatment links of drying and crushing or water distribution and fluidization, and the like, can directly treat the high-viscosity sludge muck with the water content higher than the liquid limit value, and regenerates the filler which is in loose powder shape, has proper water content and viscosity and is easy to pave and compact in a short time and under the condition of low consumption of the curing agent. The filler produced by the invention can meet the requirement of roadbed bearing capacity by fully exerting the self-compaction. The invention can realize the synergistic solution of the problems of large-scale consumption of the sludge residue soil and the shortage of roadbed filling resources.
In order to achieve the purpose, the invention provides the following technical scheme:
the production process of the silt muck solidification and regeneration roadbed filling specifically comprises the following steps:
s1: testing the parameters of particle composition, liquid limit, plastic limit and water content of the muddy muck, subtracting the tested liquid limit and plastic limit to obtain a plasticity index, and determining the using amount of the curing agent according to the obtained parameters of particle composition, plasticity index and water content;
s2: preparing sludge muck and a curing agent according to the using amount of the curing agent, uniformly mixing and stirring to reduce the plasticity index and the water content of the sludge muck and granulate the sludge muck into granules;
s3: turning and maintaining the granules to reduce the water content of the granules and realize the homogenization of the granules, namely the granules are mixed with the curing agent more uniformly;
s4: detecting the optimal water content and the water content of the homogenized granules, and if the water content of the granules is not higher than the optimal water content plus 5%, using the homogenized granules as a regenerated roadbed filler to finish the production of the regenerated roadbed filler; otherwise, continuously repeating the step S3 until the water content of the granules is not higher than the optimal water content + 5%.
The water content of the sludge muck is higher than the liquid limit.
In the steps S1-S4, the sludge residue soil with the water content higher than the liquid limit and the high viscosity in the natural state can be directly solidified without pretreatment operations such as drying, crushing or water distribution fluidization (water distribution fluidization refers to adding water and stirring to change the sludge residue soil into a fluid state).
In the step S4, the regenerated roadbed filler is in loose powder particle shape, the water content is not higher than the optimal water content by + 5%, the particle size is less than 5mm, secondary dust doping is not needed when the roadbed is filled, the roadbed can be directly paved and rolled, and the dust pollution of road construction is effectively reduced.
In step S1, the curing agent is one or more of quicklime, cement and pozzolanic powder.
In the step S1, the dosage of the curing agent is more than or equal to 6% of the mass of the mucky soil.
In the step S2, a double-shaft stirrer is used for mechanical stirring, and the mucky residue soil and the curing agent are uniformly mixed.
In the step S3, a composting turner is used to turn and maintain the granules.
In the step S4, the moisture content of the aggregate is controlled to approach the optimal moisture content state, so as to fully exert the compaction of the regenerated roadbed filler, and retain the moisture required by the formation of the self-cementing structure, so that the roadbed strength meets the requirement and continuously increases.
In the step S1, the curing agent is preferably composed of the following three components: the quick lime which absorbs moisture rapidly is used as cement which is hydrated and absorbs moisture in a short period and improves strength, and is used as a pozzolanic powder material which induces a self-cementing structure to form. Wherein, the preferable mixing amount of the lime and the cement is that the total amount of the cement and the lime is not less than 6 percent of the mass of the mucky residue soil. On the basis, the addition of the admixture is not limited.
The invention has the beneficial effects that:
the method can directly treat newly excavated sludge residue soil with high water content and high viscosity without pretreatment operations such as drying, crushing, water distribution, fluidization and the like, has simple and efficient process flow, and is easy for industrial application and large-scale popularization.
The invention can regenerate the silt muck with high water content into the powder-shaped roadbed filling material in a shorter treatment period at a lower mixing amount of the curing agent, and the produced filling material has proper water content, viscosity and particle size, is easy to transport and pave, can be rolled and compacted, and meets the requirement of roadbed bearing capacity.
The invention can absorb the silt muck in a large scale and add a new choice for materials for roadbed construction.
Drawings
FIG. 1 is a flow chart of a specific process of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art based on the embodiments of the present invention without any inventive step, shall fall within the scope of the present invention.
The production process of the subgrade filler by curing the mucky soil is carried out according to the technical scheme in the claims and the specification, and the process flow chart is shown in figure 1.
Example 1
(a) Carrying out index test on the sludge muck, and determining that the mixing amount of the curing agent is 6% according to the parameters obtained by the test, wherein the liquid limit of the sludge muck is 46.0%, the plastic limit of the sludge muck is 22.4%, the plasticity index of the sludge muck is 23.6, the content of sticky particles is 33%, and the water content of the muck is 48.8%;
(b) mixing and stirring the sludge muck which is not pretreated and has the water content of 48.8 percent and higher than the liquid limit value and a curing agent with the mass of 6 percent of the muck so as to reduce the plasticity index and the water content of the sludge muck and realize granulation;
(c) turning and maintaining the granules for 7 days, reducing the moisture content of the granules and realizing the homogenization of the granules;
(d) and (4) producing the silty muck solidification regeneration roadbed filling, immediately compacting the filling into a test piece for the California bearing ratio test, and carrying out a strength test after soaking for 4 days.
(e) The filler of the embodiment can be applied to road bed filling on site, and the compactness is more than or equal to 96 percent during filling.
Example 2
(a) Carrying out index test on the sludge muck, and determining that the mixing amount of the curing agent is 10% according to the parameters obtained by the test, wherein the liquid limit of the sludge muck is 46.0%, the plastic limit of the sludge muck is 22.4%, the plasticity index of the sludge muck is 23.6, the content of sticky particles is 33%, and the water content of the muck is 54.4%;
(b) uniformly mixing and stirring the sludge muck which is not pretreated and has the water content of 54.4 percent and higher than the liquid limit value and a curing agent with the mass of 10 percent of the muck so as to reduce the plasticity index and the water content of the sludge muck and realize granulation;
(c) turning and maintaining the granules for 4 days, reducing the moisture content of the granules and realizing the homogenization of the granules;
(d) and (4) producing the silty muck solidification regeneration roadbed filling, immediately compacting the filling into a test piece for the California bearing ratio test, and carrying out a strength test after soaking for 4 days.
(e) The filler of the embodiment can be applied to embankment filling on site, and the compaction degree is more than or equal to 94 percent during filling.
Example 3
(a) Carrying out index test on the sludge muck, and determining that the mixing amount of the curing agent is 8% according to the parameters obtained by the test, wherein the liquid limit of the sludge muck is 41.5%, the plastic limit of the sludge muck is 27.6%, the plasticity index of the sludge muck is 13.8, the content of sticky particles is 19%, and the water content of the muck is 44.9%;
(b) uniformly mixing and stirring the sludge muck which is not pretreated and has the water content of 41.5 percent higher than the liquid limit value and a curing agent with the mass of 8 percent of the muck so as to reduce the plasticity index and the water content of the sludge muck and realize granulation;
(c) turning and maintaining the granules for 4 days, reducing the moisture content of the granules and realizing the homogenization of the granules;
(d) and (4) producing the silty muck solidification regeneration roadbed filling, immediately compacting the filling into a test piece for the California bearing ratio test, and carrying out a strength test after soaking for 4 days.
(e) The filler of the embodiment can be applied to road bed filling on site, and the compactness is more than or equal to 96 percent during filling.
TABLE 1 roadbed filling treatment process parameters and California bearing ratio test results after the compacted test piece is soaked in water for 4 days
The filler prepared by the production process of the silt residue soil curing regeneration roadbed filler has the advantages of small using amount of the curing agent, short treatment period, low cost and high efficiency. By exerting the self-compaction of the filler, the California bearing ratio exceeds 4 percent and 8 percent after being soaked in water for 4 days, and the requirements on the strength of embankments and road beds under various levels of highways and traffic loads are met respectively.
Although the embodiments and results of the present invention have been described in detail, the scope of the invention is not limited thereto, and those skilled in the art can substitute or change the technical solution and inventive concept of the present invention within the technical scope of the present invention.
Claims (8)
1. A production process for solidifying and regenerating roadbed filling by sludge muck is characterized by comprising the following steps:
s1: testing the parameters of particle composition, liquid limit, plastic limit and water content of the muddy muck, subtracting the tested liquid limit and plastic limit to obtain a plasticity index, and determining the using amount of the curing agent according to the obtained parameters of particle composition, plasticity index and water content;
s2: preparing sludge muck and a curing agent according to the using amount of the curing agent, uniformly mixing and stirring to reduce the plasticity index and the water content of the sludge muck and granulate the sludge muck into granules;
s3: turning and maintaining the granules to reduce the water content of the granules and realize the homogenization of the granules;
s4: detecting the optimal water content and the water content of the homogenized granules, and if the water content of the granules is not higher than the optimal water content plus 5%, using the homogenized granules as a regenerated roadbed filler to finish the production of the regenerated roadbed filler; otherwise, continuously repeating the step S3 until the water content of the granules is not higher than the optimal water content + 5%.
2. The process for producing the silt residue soil curing and regenerating roadbed filling material according to the claim 1, is characterized in that: the water content of the sludge muck is higher than the liquid limit.
3. The process for producing the silt residue soil curing and regenerating roadbed filling material according to the claim 1, is characterized in that: in steps S1 to S4, pretreatment operations such as dry pulverization or water-distributed fluidization are not required.
4. The process for producing the silt residue soil curing and regenerating roadbed filling material according to the claim 1, is characterized in that: in the step S4, the regenerated roadbed filling material is in a powder shape, the water content is not higher than the optimal water content by + 5%, and the grain diameter is less than 5 mm.
5. The process for producing the silt residue soil curing and regenerating roadbed filling material according to the claim 1, is characterized in that: in step S1, the curing agent is one or more of quicklime, cement and pozzolanic powder.
6. The process for producing the silt residue soil curing and regenerating roadbed filling material according to the claim 1, is characterized in that: in the step S1, the dosage of the curing agent is more than or equal to 6 percent of the mass of the mucky residue soil.
7. The process for producing the silt residue soil curing and regenerating roadbed filling material according to the claim 1, is characterized in that: in the step S2, a double-shaft mixer is used to mix and stir the mucky residue and the curing agent.
8. The process for producing the silt residue soil curing and regenerating roadbed filling material according to the claim 1, is characterized in that: in the step S3, a composting turner is used to turn and maintain the granules.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114213072A (en) * | 2021-12-30 | 2022-03-22 | 申能环境科技有限公司 | Treatment process for preparing roadbed filler from high-water-content sludge residue soil and roadbed filler |
| CN114349437A (en) * | 2022-03-16 | 2022-04-15 | 中国科学院生态环境研究中心 | Method for preparing road material from high-water-content sludge/engineering muck |
| CN114772878A (en) * | 2022-04-05 | 2022-07-22 | 浙江华东工程建设管理有限公司 | Rapid curing agent for pipe-jacking construction slurry and rapid curing method |
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| CN114213072A (en) * | 2021-12-30 | 2022-03-22 | 申能环境科技有限公司 | Treatment process for preparing roadbed filler from high-water-content sludge residue soil and roadbed filler |
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| CN114772878A (en) * | 2022-04-05 | 2022-07-22 | 浙江华东工程建设管理有限公司 | Rapid curing agent for pipe-jacking construction slurry and rapid curing method |
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Application publication date: 20210928 |