CN113264731B - Controllable low-strength backfill material and preparation method thereof - Google Patents
Controllable low-strength backfill material and preparation method thereof Download PDFInfo
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- CN113264731B CN113264731B CN202110578448.1A CN202110578448A CN113264731B CN 113264731 B CN113264731 B CN 113264731B CN 202110578448 A CN202110578448 A CN 202110578448A CN 113264731 B CN113264731 B CN 113264731B
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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
- 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
- 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
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention provides a controllable low-strength backfill material and a preparation method thereof. The controllable low-strength backfill material is prepared by adding fly ash, cement, water, a water reducing agent and a soil body dispersing agent into a basic raw material, and fully and uniformly mixing, wherein the basic raw material is a mixture of broken engineering residue soil, stirring station residue and sludge; the prepared controllable low-strength backfill material comprises the following components in parts by weight: 30-45 parts of engineering residue soil, 20-30 parts of stirring station waste residue, 10-20 parts of sludge, 5-10 parts of fly ash, 5-20 parts of cement, 10-25 parts of water, 0.1-2 parts of water reducing agent and 0.1-2 parts of soil body dispersing agent. Through the mode, the invention can fully utilize the synergistic effect among the raw materials, effectively improve the utilization rate of waste resources and prepare the backfill material with high flow state, self-compaction and controllable unconfined compressive strength so as to meet the requirement of practical application.
Description
Technical Field
The invention relates to the technical field of construction engineering waste utilization, in particular to a controllable low-strength backfill material and a preparation method thereof.
Background
The controllable low-strength backfill material has high fluidity, can be automatically filled under the action of self weight without or with little vibration to form a self-compaction structure and replaces the cement-based low-strength backfill material of the traditional backfill material, and the 28d unconfined compressive strength of the backfill material is usually not more than 8.3 MPa. The controllable low-strength backfill material can be used as a flowing cementing material for replacing dense soil for backfill, has the characteristics of high flow state, easiness in excavation, no settlement, quick hardening, low permeability, freeze thawing resistance, variable density and the like, is applied to the fields of backfill engineering, roadbed engineering, pipeline embedding engineering, pipeline heat insulation or heat dissipation engineering, pipeline anticorrosion engineering and the like, can reduce the procedures of tamping, compaction density inspection and the like in the previous construction, effectively reduces the construction workload and construction noise, and has very large application value and prospect.
Meanwhile, the controllable low-strength backfill material can also utilize various industrial solid wastes as raw materials, so that the cost is saved, the environment is protected, and the environmental pollution can be avoided. In recent years, before the scale of underground traffic construction of each big city, the volume of excavated muck is huge, and the reclamation and large-scale utilization of the muck are urgent. In addition, with the attention of the building material industry on environmental protection, the recycling of waste water and waste residue of a concrete mixing plant is also an urgent problem to be solved. Therefore, in order to utilize various kinds of increasingly-increasing engineering wastes, a method for recycling and utilizing the wastes on a large scale needs to be found, and how to apply the wastes to the production of controllable low-strength backfill materials still remains a problem to be solved at present.
For example, patent publication No. CN108203270 provides a controllable low-strength material prepared by stirring building waste soil, building garbage recycled fine aggregate, fly ash, cement and water. The controllable low-strength material has certain unconfined compressive strength after hydration, can replace the traditional backfill material, can be used for road base layers and sub-base layers, effectively utilizes building waste soil and building garbage, and reduces the occupation of land. However, the waste used in this patent is mainly recycled aggregate obtained by crushing, screening and sorting construction waste with high strength, and the waste containing soil is difficult to be utilized more effectively. Under the current situation that engineering waste residue soil, waste residue, sludge and other wastes are increasing day by day, the types and the proportions of all components in the controllable low-strength backfill material still need to be improved, and the efficient utilization of the engineering waste residue soil is realized while the product performance is ensured.
In view of the above, there is a need for an improved controllable low-strength backfill material and a method for making the same to solve the above problems.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the present invention aims to provide a controllable low-strength backfill material and a preparation method thereof. Engineering waste residue, mixing station waste residue and sludge are used as basic raw materials, the basic raw materials are uniformly mixed with fly ash, cement, water, a water reducing agent and a soil body dispersing agent, and the dosage proportion among the raw materials is regulated, so that the waste resource utilization rate is effectively improved, and the backfill material with high flow state, self-compaction and controllable unconfined compressive strength is prepared by utilizing the synergistic effect among the raw materials.
In order to achieve the purpose, the invention provides a preparation method of a controllable low-strength backfill material, which comprises the following steps:
s1, mixing engineering waste residue and sludge in a preset amount, crushing the mixture to a preset particle size, and taking the crushed mixture as a basic raw material;
s2, adding predetermined amounts of fly ash, cement, water, a water reducing agent and a soil body dispersing agent into the basic raw material obtained in the step S1, and fully stirring until the materials are uniformly mixed to obtain the controllable low-strength backfill material.
As a further improvement of the invention, in step S2, the mass ratio of the basic raw material to the fly ash, cement, water reducing agent and soil dispersing agent is (60-75): 5-10): 5-20): 10-25): 0.1-2.
As a further improvement of the invention, in step S1, the mass ratio of the engineering slag soil, the stirring station waste slag and the sludge is (30-45): (20-30): (10-20).
As a further improvement of the present invention, in step S1, the particle size of the base stock is less than 4.75 mm.
In order to achieve the purpose, the invention also provides a controllable low-strength backfill material, which is prepared according to any one of the technical schemes, and comprises the following components in parts by weight: 30-45 parts of engineering residue soil, 20-30 parts of stirring station waste residues, 10-20 parts of sludge, 5-10 parts of fly ash, 5-20 parts of cement, 10-25 parts of water, 0.1-2 parts of a water reducing agent and 0.1-2 parts of a soil dispersing agent.
As a further improvement of the invention, the engineering muck is one or a mixture of more of subway shield spoil, pipeline engineering muck and roadbed muck; the mixing plant waste residue is one or a mixture of concrete mixing plant waste residue and mortar mixing plant waste residue; the sludge is one or the mixture of the sludge of a water plant and the sludge of a sewage treatment plant.
As a further improvement of the invention, the fly ash is one or a mixture of two of class I fly ash and class II fly ash; the cement is one or a mixture of two of ordinary portland cement and sulphoaluminate cement.
As a further improvement of the invention, the water reducing agent is one of sulfonated lignin, naphthalene sulfonic acid formaldehyde condensate, aromatic sulfamate polymer, aliphatic hydroxyl sulfonate polymer and carboxylic acid graft multipolymer.
As a further improvement of the invention, the soil body dispersing agent is one of sodium metasilicate, sodium silicate, sodium hexametaphosphate, hydrogen peroxide, sodium pyrophosphate, sodium oxalate, ammonia water and sodium hydroxide.
As a further improvement of the invention, the fluidity of the controllable low-strength backfill material is more than 220mm, the bleeding rate of 1h is 2-3%, and the 28d unconfined compressive strength is 1.5-2.0 MPa.
The invention has the beneficial effects that:
(1) the invention takes engineering slag soil, mixing station waste slag, sludge and other solid wastes as basic raw materials, uniformly mixes the basic raw materials with fly ash, cement, water, a water reducing agent and a soil body dispersing agent, and regulates and controls the dosage proportion of the raw materials to prepare the controllable low-strength backfill material. Based on the mode, the backfill material with high flow state, self-compaction and controllable unconfined compressive strength can be prepared while the utilization rate of waste resources is effectively improved by utilizing the synergistic effect among the raw materials, the preparation cost of the backfill material can be effectively reduced, the cyclic utilization of resources is facilitated, the reduction, recycling and harmless principles of solid wastes are met, and the backfill material has better economic benefit and environmental benefit.
(2) According to the invention, the engineering waste residue which is difficult to be effectively utilized is taken as a main raw material, and waste such as the waste residue and sludge of the mixing station are added, so that the utilization rate of the waste such as the waste residue and sludge of the mixing station can be improved, the strength of the backfill material can be effectively improved by utilizing a large amount of unhydrated gel material particles and hydration products contained in the waste residue and sludge, and the stability of the system is improved. On the basis, by further adding the fly ash, the cement, the water reducing agent and the soil body dispersing agent with specific contents into the basic raw materials, the connection effect among the soil particles can be destroyed by strong polar ions in the soil body dispersing agent, and the agglomeration effect among the soil particles is avoided, so that the effects of the water reducing agent and the fly ash are effectively exerted on the basis of ensuring that all the raw materials can be fully and uniformly mixed, the stability of the backfill material to water and the water consumption bandwidth are improved while the unit water consumption is reduced, the backfill material keeps higher viscosity, the flowing property and the segregation-resistant and bleeding-resistant performance of the backfill material are improved, and the strength of the backfill material is improved while the bad phenomenon of segregation and bleeding is improved. In addition, the invention can fully utilize the synergistic effect among the raw materials by controlling the consumption of the raw materials to regulate and control the performance of the backfill material, thereby improving the content of solid waste which is difficult to treat, ensuring that the prepared backfill material has the advantages of high flow state, self-compaction, controllable unconfined compressive strength and the like, and meeting the requirements of practical application.
(3) The controllable low-strength backfill material provided by the invention has the advantages of simple components, easily obtained raw materials, capability of effectively utilizing construction engineering wastes, simple preparation process, easiness in regulation and control, capability of meeting the requirements of industrial large-scale production and higher application value.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a preparation method of a controllable low-strength backfill material, which comprises the following steps:
s1, mixing engineering waste residue and sludge in a preset amount, crushing the mixture to a preset particle size, and taking the crushed mixture as a basic raw material;
s2, adding predetermined amounts of fly ash, cement, water, a water reducing agent and a soil body dispersing agent into the basic raw material obtained in the step S1, and fully stirring until the materials are uniformly mixed to obtain the controllable low-strength backfill material.
In step S1, the particle size of the base stock is less than 4.75 mm; the mass ratio of the engineering slag soil to the stirring station slag to the sludge is (30-45) to (20-30) to (10-20).
In step S2, the mass ratio of the basic raw material to the fly ash, cement, water reducing agent and soil dispersing agent is (60-75): 5-10): 5-20 ]: 10-25): 0.1-2.
The invention also provides a controllable low-strength backfill material, which is prepared according to the technical scheme and comprises the following components in parts by weight: 30-45 parts of engineering residue soil, 20-30 parts of stirring station waste residues, 10-20 parts of sludge, 5-10 parts of fly ash, 5-20 parts of cement, 10-25 parts of water, 0.1-2 parts of a water reducing agent and 0.1-2 parts of a soil dispersing agent.
The engineering muck is one or a mixture of more of subway shield spoil, pipeline engineering muck and roadbed muck; the mixing plant waste residue is one or a mixture of concrete mixing plant waste residue and mortar mixing plant waste residue; the sludge is one or the mixture of two of waterworks sludge and sewage treatment plant sludge.
The fly ash is one or a mixture of grade I fly ash and grade II fly ash; the cement is one or a mixture of two of ordinary portland cement and sulphoaluminate cement.
The water reducing agent is one of sulfonated lignin, naphthalene sulfonic acid formaldehyde condensate, aromatic sulfamate polymer, aliphatic hydroxyl sulfonate polymer and carboxylic acid graft multipolymer.
The soil body dispersing agent is one of sodium metasilicate, sodium silicate, sodium hexametaphosphate, hydrogen peroxide, sodium pyrophosphate, sodium oxalate, ammonia water and sodium hydroxide.
The fluidity of the controllable low-strength backfill material is larger than 220mm, the bleeding rate of 1h is 2% -3%, and the 28d unconfined compressive strength is 1.5-2.0 MPa.
The controllable low-strength backfill material and the preparation method thereof provided by the invention are explained by combining specific embodiments.
Example 1
The embodiment provides a preparation method of a controllable low-strength backfill material, which comprises the following steps:
s1, mixing engineering slag soil, stirring station slag and sludge in a preset amount, and crushing the mixture until the particle size is less than 4.75mm to be used as a basic raw material;
and S2, adding the fly ash, the cement, the water reducing agent and the soil body dispersing agent in the preset amount into the basic raw material obtained in the step S1, and fully stirring until the fly ash, the cement, the water reducing agent and the soil body dispersing agent are uniformly mixed to obtain the controllable low-strength backfill material.
In this embodiment, the engineering muck used is formed by mixing the subway shield spoil, the pipeline engineering muck and the roadbed muck according to the mass ratio of 1:1:1, the mixing station waste residue is concrete mixing station waste residue, the sludge is waterworks sludge, the fly ash is class I fly ash, the cement is ordinary portland cement, the water reducing agent is sulfonated lignin, and the soil body dispersing agent is sodium metasilicate.
The mass percentages of the raw materials in the controllable low-strength backfill material prepared by the embodiment are shown in table 1.
Table 1 mass percent of each raw material in the controlled low strength backfill material prepared in example 1
Examples 2 to 7 and comparative examples 1 to 2
Examples 2 to 7 and comparative examples 1 to 2 each provide a controllable low-strength backfill material, and compared with example 1, the difference is that the amount of each raw material is changed, and the preparation method is the same as that of example 1, and is not repeated herein. The mass percentages of the raw materials in the controllable low-strength backfill materials provided by the examples and the comparative examples are shown in table 2.
Table 2 quality percentages of each raw material in the controllable low strength backfill materials prepared in examples 2-7 and comparative example
The fluidity, the bleeding rate for 1 hour and the unconfined compressive strength of the controllable low-strength backfill materials prepared in the examples 1 to 7 and the comparative examples 1 to 2 are tested, and the results are shown in table 3. The fluidity is determined by referring to a cylinder standard test method of ASTM D6103, and the bleeding rate of 1h and the unconfined compressive strength are determined by referring to a concrete bleeding rate experimental test method and an unconfined compressive strength test method corresponding to JTG E30-2005 Highway engineering cement and cement concrete experimental regulations.
TABLE 3 Properties of controllable Low Strength backfill materials prepared in examples 1-7 and comparative examples 1-2
As can be seen from Table 3, the adjustment of the content of each raw material within a certain range can regulate and control the fluidity, bleeding rate, unconfined compressive strength and other properties of the prepared controllable low-strength backfill material. The fluidity of the controllable low-strength backfill material prepared according to the mixture ratio provided by the embodiments 1-7 of the invention is larger than 200mm, and the bleeding rate in 1 hour is between 2% and 3%, so that the backfill material has good constructability and volume stability; and the 28d unconfined compressive strength is 1.5-2.0 MPa, so that the strength requirement on a backfill material can be met, the backfilling is easy to excavate and maintain in the future, secondary backfilling can be guaranteed, and the method has high practical application value. Compared with the embodiment of the invention, the comparative example 1 does not add a water reducing agent and a soil body dispersing agent, so that more water is consumed, the fluidity and the unconfined compressive strength of the prepared backfill material are reduced, and the practical application of the backfill material is influenced; in the comparative example 2, the change of the proportion among the engineering slag soil, the stirring station slag and the sludge also influences the fluidity and the compressive strength of the prepared backfill material, and limits the application of the backfill material.
Based on the above, the preferable proportion of each component in the backfill material is as follows: 30-45 parts of engineering residue soil, 20-30 parts of stirring station waste residue, 10-20 parts of sludge, 5-10 parts of fly ash, 5-20 parts of cement, 10-25 parts of water, 0.1-2 parts of water reducing agent and 0.1-2 parts of soil body dispersing agent.
It should be noted that, those skilled in the art should understand that the engineering muck used in the present invention may be one or more of metro shield spoil, pipeline engineering muck, and roadbed muck; the mixing plant waste residue can be one or the mixture of concrete mixing plant waste residue and mortar mixing plant waste residue; the sludge can be one or the mixture of the sludge of a water plant and the sludge of a sewage plant; the fly ash can be one or the mixture of I-grade fly ash and II-grade fly ash; the cement can be one or the mixture of two of ordinary portland cement and sulphoaluminate cement; the water reducing agent can be one of sulfonated lignin, naphthalene sulfonic acid formaldehyde condensate, aromatic sulfamate polymer, aliphatic hydroxyl sulfonate polymer and carboxylic acid graft multipolymer; the soil body dispersant is one of sodium metasilicate, sodium silicate, sodium hexametaphosphate, hydrogen peroxide, sodium pyrophosphate, sodium oxalate, ammonia water and sodium hydroxide, and belongs to the protection scope of the invention.
In conclusion, the invention provides a controllable low-strength backfill material and a preparation method thereof. The controllable low-strength backfill material is prepared by adding fly ash, cement, water, a water reducing agent and a soil body dispersing agent into a basic raw material, and fully and uniformly mixing, wherein the basic raw material is a mixture of broken engineering residue soil, stirring station residue and sludge; the prepared controllable low-strength backfill material comprises the following components in parts by weight: 30-45 parts of engineering residue soil, 20-30 parts of stirring station waste residue, 10-20 parts of sludge, 5-10 parts of fly ash, 5-30 parts of cement, 10-25 parts of water, 0.1-2 parts of water reducing agent and 0.1-2 parts of soil body dispersing agent. Through the mode, the invention can fully utilize the synergistic effect among the raw materials, effectively improve the utilization rate of waste resources, and prepare the backfill material with high flow state, self-compaction and controllable unconfined compressive strength so as to meet the requirements of practical application.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (5)
1. A preparation method of a controllable low-strength backfill material is characterized by comprising the following steps:
s1, mixing engineering waste residue and sludge in a preset amount, crushing the mixture to a preset particle size, and taking the crushed mixture as a basic raw material;
s2, adding predetermined amounts of fly ash, cement, water, a water reducing agent and a soil body dispersing agent into the basic raw material obtained in the step S1, and fully stirring until the materials are uniformly mixed to obtain a controllable low-strength backfill material;
the mass ratio of the basic raw materials to the fly ash, the cement, the water reducing agent and the soil dispersing agent is (60-75): 5-10): 5-20): 10-25): 0.1-2; the mass ratio of the engineering slag soil to the stirring station slag to the sludge is (30-45) to (20-30) to (10-20);
the engineering muck is one or a mixture of more of subway shield spoil, pipeline engineering muck and roadbed muck; the mixing plant waste residue is one or a mixture of concrete mixing plant waste residue and mortar mixing plant waste residue; the sludge is one or the mixture of two of waterworks sludge and sewage treatment plant sludge; the soil body dispersing agent is one of sodium metasilicate, sodium silicate, sodium hexametaphosphate, sodium pyrophosphate, sodium oxalate, ammonia water and sodium hydroxide; the water reducing agent is one of sulfonated lignin, naphthalene sulfonic acid formaldehyde condensate, aromatic amino sulfonate polymer, aliphatic hydroxyl sulfonate polymer and carboxylic acid graft multipolymer.
2. The method for preparing the controllable low-strength backfill material according to the claim 1, characterized by comprising the following steps: in step S1, the particle size of the base stock is less than 4.75 mm.
3. The controllable low-strength backfill material is characterized in that: the controllable low-strength backfill material is prepared by the preparation method of any one of claims 1-2, and comprises the following components in parts by weight: 30-45 parts of engineering residue soil, 20-30 parts of stirring station waste residue, 10-20 parts of sludge, 5-10 parts of fly ash, 5-20 parts of cement, 10-25 parts of water, 0.1-2 parts of water reducing agent and 0.1-2 parts of soil body dispersing agent.
4. The controllable, low strength backfill material according to claim 3, characterized by: the fly ash is one or a mixture of I-grade fly ash and II-grade fly ash; the cement is one or a mixture of two of ordinary portland cement and sulphoaluminate cement.
5. The controllable, low strength backfill material according to claim 3, characterized by: the fluidity of the controllable low-strength backfill material is larger than 220mm, the bleeding rate of 1h is 2% -3%, and the unconfined compressive strength of 28d is 1.5-2.0 MPa.
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