CN114804767A - Premixed flow state filling material of weatherable rock aggregate - Google Patents
Premixed flow state filling material of weatherable rock aggregate Download PDFInfo
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- CN114804767A CN114804767A CN202210451377.3A CN202210451377A CN114804767A CN 114804767 A CN114804767 A CN 114804767A CN 202210451377 A CN202210451377 A CN 202210451377A CN 114804767 A CN114804767 A CN 114804767A
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- 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
- C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust 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
- C04B28/08—Slag 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
-
- 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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
-
- 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
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a premixed fluid filling material of weatherable rock aggregate, which is prepared by mixing weatherable rocks such as limestone, shale, sandstone, schist, phyllite and the like with aggregate consisting of bentonite and collapsible loess, a curing agent, an additive and water, wherein the aggregate consists of fine aggregate and coarse aggregate. The invention provides a mixed filling material which is weak in shrinkage performance, low in consolidation settlement, free of wet settlement, low in permeability, low in bearing capacity meeting requirements and low in price and mainly comprises the weatherable rock in the backfilling process by combining common engineering soil in the northwest region as a raw material.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a premixed flow state filling material of an efflorescent rock aggregate.
Background
The premixed flow state filling material is a novel environment-friendly building engineering material which is formed by taking sandy soil as a main material and a small amount of curing agent and additive, has the advantages of wide material source, good plasticity, short forming time, adjustable strength, high construction speed, high economic benefit, good seepage-proofing, compression-resisting and frost-resisting properties and the like, and can be widely applied to foundation ditch backfill engineering such as civil buildings, structures thereof, railways, airports, highways, municipal administration comprehensive pipe corridors and underground pipe network laying and the like.
With the acceleration of urbanization construction and the rapid development of economic construction in northwest areas, a large number of new buildings and structures thereof appear. When the foundation trench is backfilled, the backfilling soil compaction coefficient is generally required to be controlled to be more than 0.93, but in the backfilling construction of the fertilizer trenches of various engineering foundation pits, the backfilling depth of the foundation trench is often large, the backfilling space of the foundation trench is narrow, the backfilling requirement quality is high, the backfilling soil compaction quality is unstable, and the backfilling cannot be densely backfilled due to the influences of weather factors and the like, so that the backfilling soil compaction coefficient does not meet the design requirement or is far lower than the design requirement, and the normal use of later-stage buildings and structures thereof is influenced. In addition, deep foundation pit supporting works are increasing in recent years, and engineering accidents caused by the fact that the foundation trench backfill is not compact, so that uneven settlement is generated at the positions of buildings, building pipelines, water dispersion, roads and the like, and the buildings, the building pipelines, the water dispersion, the roads and the like are damaged, and the engineering accidents are frequently caused. The occurrence of the engineering accidents is caused by the fact that the backfill of the foundation trench does not meet the engineering quality requirements, and after the backfill of the foundation trench is completed, large-area uneven settlement occurs in a backfill area of the foundation trench due to the combined action of external factors such as groundwater seepage, surface overload, surface water seepage and the like and internal factors such as consolidation settlement of backfill itself, so that the urban attractiveness is affected, and even the life and property safety of people is threatened.
Along with more and more new buildings and structures in the northwest region, large-area excavation construction measures are generally adopted in the construction process, and a large amount of engineering waste soil can appear in the excavation process. However, most of the weatherable rocks such as limestone, shale, sandstone, schist, phyllite and the like are broken and disintegrated under the action of the atmospheric environment after being excavated, and are easy to soften when meeting water after being disintegrated, and the physical and mechanical properties of the weatherable rocks are also changed greatly. Therefore, after construction is completed, in order to improve engineering benefits, the excavated weatherable rocks such as limestone, shale, sandstone, schist, phyllite and the like are optimized and improved to form a novel filling material which has weak shrinkage performance, low consolidation settlement, no wet sinking, low permeability and satisfactory bearing capacity, and the foundation trench is backfilled on a large surface, so that engineering accidents caused by the fact that the backfilling quality of the foundation trench does not meet engineering requirements are avoided.
The premixed flow state filling material is used as an environment-friendly engineering material which is green and innovative, low in price and excellent in performance, and particularly has special technical advantages for filling narrow spaces, and has strong applicability and inclusion. Not only reduces the influence on the surrounding environment, but also reduces the manufacturing cost, thereby having wide engineering application prospect. Therefore, it is necessary and urgent to solve the "no waste city", the trench backfill, and the reduction of engineering accidents through the research of the premixed fluidized filling material.
Disclosure of Invention
The invention aims to provide a premixed fluid filling material of an efflorescent rock aggregate, and solves the problems.
In order to achieve the purpose, the invention provides the following technical scheme: a premixed fluidized filler for the weatherable rock aggregate is prepared from weatherable rock, bentone, aggregate, solidifying agent, additive and water through mixing.
Preferably, the efflorescent rock is composed of limestone, shale, sandstone, schist and phyllite.
Preferably, the aggregate is composed of fine aggregate and coarse aggregate.
Preferably, the fine aggregate is one or more of bentonite, collapsible loess, fine sand and weatherable rock fine aggregate, and the coarse aggregate is one or more of weatherable rock coarse aggregate.
Preferably, the curing agent is one or more of cement, lime, fly ash and mineral powder.
Preferably, the additive is one or more of pumping aid, water reducing agent, accelerating agent, retarder, expanding agent, antifreeze, anti-seepage agent, early strength agent and lignin.
Preferably, the dosage of the coarse aggregate is 40-80% of the aggregate; the dosage of the fine aggregate is 20 to 60 percent of the aggregate. The dosage of the curing agent is 0 to 20 percent of the dosage of the aggregate; the dosage of the additive is 0 to 3 percent of the aggregate; the water dosage is 15-32% of the sum of the aggregate dosage and the curing agent dosage.
The invention relates to a preparation method of a premixed fluid filling material of an efflorescent rock aggregate, which comprises the following steps:
(1) calculating the dosage of the fine aggregate when the fine aggregate does not contain the fine aggregate of the weatherable rock: if the fine aggregate does not contain the weatherable rock, namely the weatherable rock coarse aggregate and the bentonite and the collapsible loess fine aggregate, according to the selected proportion, the required mass of the coarse aggregate is the mass which is required by the weatherable rock coarse aggregate, the required mass of the fine aggregate is the mass which is required by the bentonite and the collapsible loess,
i.e. m Gross amount of coarse aggregate ＝m Weathered rock coarse aggregate ；m Total amount of fine aggregate ＝m Bentonite and loess ；
(2) The screening experiment was carried out when the fine aggregate contained the fine aggregate of the weatherable rock: if the fine aggregate contains fine aggregates of the weatherable rock, the weatherable rock comprises coarse aggregates and fine aggregates after being crushed, and the weatherable rock comprises coarse aggregates and fine aggregates simultaneously, after parts with the diameter larger than 40mm are screened out, the parts are subjected to screening experiment, and the mass percentage (omega) of the coarse aggregates of the weatherable rock with the particle size of 5mm to 40mm and the fine aggregates of the weatherable rock with the particle size of below 5mm is obtained Coarse aggregate of weathered rock 、ω Fine aggregate of efflorescent rock ) According to the technical scheme, the coarse weathered rock aggregate with the grain size of more than 5mm and less than 40mm is used as a component of the coarse aggregate, and the fine weathered rock aggregate with the grain size of less than 5mm is used as a component of the fine aggregate;
(3) calculating the dosage of the fine aggregate containing the fine aggregate of the weatherable rock: according to the selected proportion, after the total mass of the coarse aggregates of the weatherable rocks is multiplied by the mass percentage of the coarse aggregates to meet the required mass of the coarse aggregates, the mass m is met Efflorescence rock ×ω Weatherable rock phase aggregate ＝m Total amount of coarse aggregate Then, the mass of the bentonite and the collapsible loess which are correspondingly needed is the total mass of the fine aggregate needed under the proportion minus the mass of the fine aggregate in the weatherable rock at the moment, namely m Bentonite and loess ＝m Total amount of fine aggregate -(m Efflorescence rock ×ω Fine aggregate of weathered rock )；
(4) Preparing fine aggregate: sieving fine aggregate with particle size less than 5mm in bentonite, collapsible loess and weatherable rock to remove impurities;
(5) preparing coarse aggregate: screening the crushed weatherable rock to remove the part with the grain diameter larger than 40mm and the fine aggregate of the weatherable rock smaller than 5mm, and taking the rest coarse aggregate of the weatherable rock with the grain diameter larger than 5mm and smaller than 40mm as actual coarse aggregate;
(6) and (3) aggregate water content determination: measuring the water content of the used fine aggregate and coarse aggregate;
(7) raw material weighing: weighing each component of the invention according to the formulated mixing proportion and the water content of the fine aggregate and the coarse aggregate;
(8) stirring: placing the weighed raw materials in a stirrer, and fully stirring to fully fuse various raw materials;
(9) filling: and filling the fully stirred raw materials in a backfilling project.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention has strong applicability and inclusion, simple and convenient construction and self-compactness, can be applied to narrow and complex construction sites, solves the problem that the backfill soil at the supporting structure is not easy to compact, and the like, and greatly shortens the construction period;
(2) the aggregate adopted by the invention is engineering waste, the main aggregate adopted by the invention is the weatherable rock which is usually treated as waste in normal production and life, but through the treatment of the invention, the aggregate can be applied to backfill engineering such as foundation trench backfill, municipal pipe network construction and roadbed widening, and the like, the backfill effect is obvious, the surrounding environment is not influenced, and the aggregate has great social significance of resource reutilization, energy conservation and emission reduction;
(3) the invention can improve various performances of the filling material, and the invention utilizes the characteristics that the properties of the raw materials in the fine aggregate and the coarse aggregate are different but can be complemented, so that the particle grading is more excellent, and the invention has the characteristics of weak shrinkage performance, low consolidation settlement, no collapsibility, low permeability, meeting the requirements on strength and the like;
(4) the invention is a premixed fluid filling material, can eliminate the characteristic that the weatherable rock disintegrates when meeting water in the stirring process, and utilizes the characteristic that bentonite swells when meeting water, so that the particle framework is more tightly cemented, meanwhile, the sedimentation amount of the filling material is reduced, the permeability of the filling material is reduced, the strength and the bearing capacity of the filling material are improved, and the integrity of the filling material is ensured;
(5) the invention can essentially solve the problem of later-stage uneven ground settlement, and when the backfill is started, the invention is used, the uneven ground settlement problem can be avoided by utilizing the characteristics of weak shrinkage performance, low consolidation settlement, no wet settlement, low permeability, meeting the requirement on strength and the like, and other settlement treatment measures are not needed to be taken subsequently;
(6) the invention has low cost, and the invention uses engineering excavation waste as aggregate, uses a small amount of curing agent and external dosage to carry out backfill construction, and can save engineering cost and reduce filling cost on the premise of reaching the standard of filling effect.
Drawings
FIG. 1 is a graph comparing the compressive strengths of example 1 of the present invention;
FIG. 2 is a graph showing a comparison of compression factors in embodiment 1 of the present invention;
FIG. 3 is a graph comparing the coefficient of collapse for example 1 of the present invention;
FIG. 4 is a graph comparing permeability coefficients for example 1 of the present invention;
FIG. 5 is a graph comparing the compressive strengths of example 2 of the present invention;
FIG. 6 is a graph comparing compression ratios in example 2 of the present invention;
FIG. 7 is a graph comparing the coefficient of wet set in example 2 of the present invention;
FIG. 8 is a graph comparing permeation coefficients of example 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A premixed fluidized filler for the weatherable rock aggregate is prepared from weatherable rock, bentone, aggregate, solidifying agent, additive and water through mixing.
Preferably, the fine aggregate is one or more of bentonite, collapsible loess, fine sand and weatherable rock fine aggregate, and the coarse aggregate is one or more of weatherable rock coarse aggregate.
Preferably, the fine aggregate (one or more of bentonite, collapsible loess, fine sand and weatherable rock fine aggregate) is: the bentonite and the collapsible loess have certain cohesiveness and can also have the function of bonding various materials.
Preferably, the coarse aggregate (weatherable rock coarse aggregate): in the integral filling material, weathered rocks are mutually overlapped to play a role of supporting a framework of the integral material, and the formed framework can effectively reduce the contractibility of the integral material in the pouring, maintenance and use processes of the invention.
Preferably, the curing agent is one or more of cement, lime, fly ash, mineral powder and the like. The curing agent plays a role of a cementing material in the integral filling material, namely, various bulk materials in the invention are cemented together to form a whole, the collapsibility of collapsible loess and the characteristic that the weatherable rock is easy to disintegrate when meeting water are eliminated, and simultaneously, the complementary characteristic of the materials is fully utilized by utilizing the characteristic that the bentonite expands when meeting water, and the bentonite and the fine aggregate are together tightly filled in the gaps among the coarse aggregates, so that all the materials play a role together, and thus, various performance indexes of the premixed flow state filling material of the weatherable rock aggregate are improved.
Preferably, the additive is one or a combination of a pumping aid, a water reducing agent, a retarder, an expanding agent, freezing resistance, a permeability-reducing agent, an early strength agent and lignin.
The admixture of the invention is respectively added with the admixture which correspondingly improves the performance of the filling material according to the special requirements of actual engineering on the fluidity, the contractibility, the workability, the permeability and the setting time of the filling material, thereby achieving the purpose of improving the performance of the filling material.
The filling material mixes two materials which have completely different material properties and are respectively used and have defects according to a certain proportion, and adds a certain amount of curing agent, thereby obtaining a brand new mixed filling material.
The additive plays a role in the invention in that: aiming at the difference of the performance requirements of different practical projects on filling materials, a method of adding an additive for improving the corresponding performance is adopted to improve the corresponding performance. As long as the pumping aid, the water reducing agent, the accelerating agent, the retarder, the expanding agent, the antifreeze, the anti-seepage agent, the early strength agent, the lignin and other additives which can improve the related performance of the filling material can be added, the filling material is not limited in type.
The pumping agent types comprise a retarding pumping agent and an early-strength pumping agent;
the water reducing agent types comprise lignosulfonate water reducing agents, polycyclic aromatic sulfonate water reducing agents, water-soluble resin sulfonate water reducing agents, aliphatic water reducing agents, modified calcium lignosulfonate water reducing agents, modified tannin water reducing agents and the like;
the accelerating agent types comprise aluminum oxide clinker accelerating agents, aluminum oxide clinker-alunite accelerating agents, water glass accelerating agents, bottom alkali organic accelerating agents and the like;
the retarder types comprise lignin sulfate and derivatives thereof, fiber derivatives thereof, hydroxycarboxylic acid and salts thereof, sulfonated tannin extract, sodium tannate and the like;
the type of the expanding agent comprises a calcium sulphoaluminate expanding agent, a calcium oxide expanding agent, a metal expanding agent and the like;
the antifreeze agent types comprise chloride antifreeze agents, chloride rust-resisting antifreeze agents, nitrite antifreeze agents, nitrate antifreeze agents, composite antifreeze agents and the like;
the types of the anti-seepage agent comprise silicate anti-seepage agent, metal soap anti-seepage agent, chloride metal salt anti-seepage agent and the like;
the early strength agent type comprises a strong electrolyte inorganic salt early strength agent, a water-soluble organic early strength agent and a composite early strength agent compounded by organic matters and inorganic matters;
the lignin type comprises guaiacol lignin, guaiacol-sinapyl-p-hydroxybenzyl lignin;
the water in the invention can increase the fluidity and the caking property of the filling material and ensure the complete reaction with a curing agent, an additive and the like.
Preferably, the dosage of the coarse aggregate is 40-80% of the aggregate; the dosage of the fine aggregate is 20 to 60 percent of the aggregate. The dosage of the curing agent is 0 to 20 percent of the aggregate; the dosage of the additive is 0 to 3 percent of the dosage of the aggregate; the water dosage is 15-32% of the sum of the aggregate dosage and the curing agent dosage.
Example 1:
the method is characterized in that efflorescent rocks such as limestone, shale, sandstone, schist and phyllite dug out from a foundation trench, bentonite and collapsible loess are used as main materials, a curing agent is used as a secondary material, the curing agent is ordinary portland cement, the cement strength grade is 42.5MPa, and an additive is a delayed coagulation type solid pumping aid. And conveying the aggregate into a stirrer, simultaneously mixing the curing agent, the additive and a certain proportion of water to form slurry, and conveying the slurry into the stirrer, and uniformly stirring by the stirrer to form the filling material with good fluidity and certain strength after hardening. The premixed flow state filling material of the efflorescent rock, the bentonite and the collapsible loess aggregate in the embodiment 1 comprises the following components: the fine aggregate is bentonite, collapsible loess and efflorescent rock fine aggregate which respectively account for 5%, 36% and 18% of the total amount of the aggregate; the coarse aggregate is the coarse aggregate of the weatherable rock and accounts for 41 percent of the total weight of the aggregate; the mixing amount of the curing agent is 1 percent of the total amount of the common Portland cement and the mixing amount of the additive is 1 percent of the total amount of the aggregate; the mixing amount of water is 30% of the total mass of the aggregate, the curing agent and the admixture, and the adding mass of the water is as follows: m is Water (W) ＝(m Aggregate total amount +m Curing agent +m Additive agent )×ω 0 Wherein m is Water (W) M is the added mass of water required Aggregate total amount Is the sum of dry mass of bentonite, collapsible loess and weatherable rock m Fixing device The agent is a dry mass, m, of ordinary portland cement Additive agent For dry mass incorporation of pumping agents, omega 0 The water content is required by the weatherable rock, bentonite and collapsible loess aggregate filling material. After being uniformly stirred and subjected to standard curing and natural curing for 28 days, the weatherable rock, the bentonite and the collapsible loess aggregate filling material are respectively subjected to compression resistanceThe method comprises the following steps of (1) carrying out a strength test, a consolidation test, a collapsibility test and a permeability test, and obtaining corresponding data; meanwhile, a control group 1 (bentonite is not added after stirring under the same conditions) and a control group 2 (cement is not added after stirring under the same conditions) are respectively arranged, and a control test under the same test conditions is carried out, so that the premixed flow state filling material of the weatherable rock, the bentonite and the collapsible loess aggregate, which is provided by the invention, has the characteristics of weak shrinkage performance, low consolidation settlement, no collapsibility, low permeability, strength meeting the requirements and the like, and the control results are shown in figures 1-4.
Example 2:
the method is characterized in that efflorescent rocks such as limestone, shale, sandstone, schist and phyllite dug out from a foundation trench, bentonite and collapsible loess are used as main materials, a curing agent and an additive are used as secondary materials, the curing agent is ordinary portland cement, the cement strength grade is 42.5MPa, and the additive is a delayed coagulation type solid pumping aid. And conveying the aggregate into a stirrer, simultaneously mixing the curing agent, the additive and a certain proportion of water to form slurry, and conveying the slurry into the stirrer, and uniformly stirring by the stirrer to form the filling material with good fluidity and certain strength after hardening. The premixed flow state filling material of the weatherable rock aggregate in the embodiment 2 comprises the following components: the fine aggregate is bentonite, collapsible loess and efflorescent rock fine aggregate which respectively account for 11 percent, 22 percent and 20 percent of the total weight of the aggregate; the coarse aggregate is the coarse aggregate of the weatherable rock and accounts for 47 percent of the total weight of the aggregate; the mixing amount of the curing agent is 7 percent of the total amount of the aggregate of the ordinary portland cement, and the mixing amount of the additive is 0.4 percent of the total amount of the aggregate; the mixing amount of water is 30% of the total mass of the aggregate, the curing agent and the admixture, and the adding mass of the water is as follows: m is Water (W) ＝(m Aggregate total amount +m Curing agent +m Additive agent )×ω 0 Wherein m is Water (W) Is the added mass of water, m Aggregate total amount Dry mass of bentonite, collapsible loess and efflorescent rock, m Curing agent For incorporation into the dry mass of ordinary portland cement, m Additive agent For dry mass incorporation of pumping agents, omega 0 The required moisture content for the weatherable rock and bentonite, collapsible loess aggregate filling material, in this example 30% was taken. Warp beamAfter uniformly stirring and carrying out standard maintenance and natural maintenance for 28 days, respectively carrying out a compressive strength test, a consolidation test, a collapsibility test and a permeability test on the weatherable rock, the bentonite and the collapsible loess aggregate filling material, and obtaining corresponding data; meanwhile, a control group 1 (no bentonite added after stirring under the same conditions) and a control group 2 (no cement added after stirring under the same conditions) are respectively arranged, and a control test under the same test conditions is carried out, so that the weatherable rock aggregate filling material provided by the invention has the characteristics of weak shrinkage performance, reduced consolidation settlement, no wet settlement, low permeability, strength meeting requirements and the like, and the control results are shown in fig. 5-8.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The premixed fluidized filling material of the weatherable rock aggregate is characterized in that: the filling material is formed by mixing the weatherable rock, bentonite, aggregate, a curing agent, an additive and water together.
2. The ready-mixed fluidized filling material of the weatherable rock aggregate according to claim 1, characterized in that: the said efflorescent rock is composed of limestone, shale, sandstone, schist and phyllite.
3. The ready-mixed fluidized filling material of the weatherable rock aggregate according to claim 1, characterized in that: the aggregate is composed of fine aggregate and coarse aggregate.
4. The ready-mixed fluidized filling material of the weatherable rock aggregate according to claim 3, characterized in that: the fine aggregate is one or more of bentonite, collapsible loess, fine sand or fine aggregates of the weatherable rock, and the coarse aggregate is coarse aggregates of the weatherable rock.
5. The ready-mixed fluidized filling material of the weatherable rock aggregate according to claim 1, characterized in that: the curing agent is one or a combination of more of cement, lime, fly ash and mineral powder.
6. The ready-mixed fluidized filling material of the weatherable rock aggregate according to claim 1, characterized in that: the additive is one or a plurality of combinations of pumping aid, water reducing agent, accelerating agent, retarder, expanding agent, antifreeze, permeability-reducing agent, early strength agent and lignin.
7. The ready-mixed fluidized filling material of the weatherable rock aggregate according to claim 3, characterized in that: the dosage of the coarse aggregate is 40 to 80 percent of the aggregate; the dosage of the fine aggregate is 20 to 60 percent of the aggregate.
8. The ready-mixed fluidized filling material of the weatherable rock aggregate according to claim 1, characterized in that: the dosage of the curing agent is 0 to 20 percent of the aggregate; the dosage of the additive is 0 to 3 percent of the aggregate; the water dosage is 15-32% of the sum of the aggregate dosage and the curing agent dosage.
9. A preparation method of a premixed fluid filling material of an efflorescence rock aggregate is characterized by comprising the following steps:
(1) calculating the dosage of the fine aggregate when the fine aggregate does not contain the fine aggregate of the weatherable rock: if the fine aggregate does not contain the fine aggregates of the weatherable rock, namely the bentonite, the collapsible loess and the coarse aggregates of the weatherable rock, according to the selected proportion, the required mass of the coarse aggregate is the mass which is required by the coarse aggregates of the weatherable rock, the required mass of the fine aggregate is the mass which is required by the bentonite and the collapsible loess,
i.e. m Gross amount of coarse aggregate ＝m Coarse aggregate of weathered rock ；m Total amount of fine aggregate ＝m Loess, bentonite ；
(2) Sieving when the fine aggregate contains fine aggregates of the efflorescent rocksTesting: if the fine aggregate contains fine aggregates of the weatherable rock, the weatherable rock is crushed and simultaneously comprises coarse aggregates and fine aggregates, after the part with the diameter larger than 40mm is screened out, the coarse aggregates of the weatherable rock with the grain diameter of between 5 and 40mm and the fine aggregates of the weatherable rock with the grain diameter of below 5mm are obtained by the screening experiment Coarse aggregate of weathered rock 、ω Fine aggregate of efflorescent rock According to the technical scheme, the coarse weathered rock aggregate with the grain size of more than 5mm and less than 40mm is used as a component of the coarse aggregate, and the fine weathered rock aggregate with the grain size of less than 5mm is used as a component of the fine aggregate;
(3) calculating the dosage of the fine aggregate containing the fine aggregate of the weatherable rock: according to the selected proportion, after the total mass of the coarse aggregates of the weatherable rocks is multiplied by the mass percentage of the coarse aggregates to meet the required mass of the coarse aggregates, the mass m is met Efflorescence rock ×ω Coarse aggregate of weathered rock ＝m Gross amount of coarse aggregate Then, the mass of the bentonite and the collapsible loess which are correspondingly needed is the total mass of the fine aggregate needed under the proportion minus the mass of the fine aggregate in the weatherable rock at the moment, namely m Bentonite and loess ＝m Total amount of fine aggregate -(m Efflorescence rock ×ω Fine aggregate of efflorescent rock )；
(4) Preparing fine aggregate: screening the bentonite, the collapsible loess and the fine aggregate of the efflorescent rock with the particle size of less than 5mm, and screening out impurities;
(5) preparing coarse aggregate: screening the crushed weathered rock, and screening out a part with the grain diameter of more than 40mm and fine aggregate of the weathered rock with the grain diameter of less than 5mm, wherein the rest coarse aggregate of the weathered rock with the grain diameter of more than 5mm and less than 40mm is actual coarse aggregate;
(6) and (3) aggregate water content determination: measuring the water content of the used fine aggregate and coarse aggregate;
(7) raw material weighing: weighing each component of the invention according to the formulated mixing proportion and the water content of the fine aggregate and the coarse aggregate;
(8) stirring: placing the weighed raw materials in a stirrer, and fully stirring to fully fuse various raw materials;
(9) filling: and filling the fully stirred raw materials in a backfilling project.
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| US20090158960A1 (en) * | 2007-12-20 | 2009-06-25 | Icrete, Llc | Highly workable concrete compositions having minimal bleeding and segregation |
| CN112500045A (en) * | 2020-12-09 | 2021-03-16 | 中建三局集团有限公司 | Fertilizer groove backfill material and backfill method for non-self-weight collapsible loess area |
| CN112521101A (en) * | 2020-12-18 | 2021-03-19 | 浙江华东工程咨询有限公司 | Modified medium weathering argillaceous siltstone filler and preparation method thereof |
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