CN113321468A - Coal gangue cemented filling material and high-fluidity high-solid-content cemented filling material slurry - Google Patents
Coal gangue cemented filling material and high-fluidity high-solid-content cemented filling material slurry Download PDFInfo
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- CN113321468A CN113321468A CN202110653271.7A CN202110653271A CN113321468A CN 113321468 A CN113321468 A CN 113321468A CN 202110653271 A CN202110653271 A CN 202110653271A CN 113321468 A CN113321468 A CN 113321468A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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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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Abstract
The invention discloses a coal gangue cemented filling material and high-fluidity high-solid content cemented filling material slurry, wherein the coal gangue cemented filling material is composed of coal gangue, cement, fly ash, auxiliary materials and a water reducing agent; 50-95 parts of coal gangue, 4-20 parts of cement, 1-50 parts of fly ash, 0.5-40 parts of auxiliary material and 0.05-5 parts of water reducer. The cemented filling material can obtain good fluidity with less water consumption, has certain strength after being solidified and hardened in a filling area, and can meet the requirements of filling mining and goaf filling on the mechanical properties of the filling material. The filling material slurry is obtained by mixing and uniformly stirring the filling material and water, and the mass fraction of the water is 7.8-10 wt%. The cementing filling material slurry has good fluidity and workability, stable state, easy long-distance transportation, no shrinkage and slight expansion after coagulation and hardening, and good topping property.
Description
Technical Field
The invention relates to the technical field of mine filling materials. In particular to a coal gangue cemented filling material and high-fluidity high-solid content cemented filling material slurry.
Background
The cemented filling mining method is beneficial to protecting surface buildings, roads, railways and the like, can effectively improve the stress state of the surrounding rock, limit the scale of the movement of the surrounding rock, prevent and relieve the ground pressure movement of the mine, and can effectively reduce the negative influence of the solid waste discharge of the mine. To prevent the pipe plugging problem of the delivery pipe when delivering the cementitious filler material, the solids content of the cementitious filler slurry is typically low. Therefore, after the cemented filling material slurry enters the goaf, excess water needs to be discharged, the discharged water can damage the mining operation environment, but if the excess water cannot be discharged in time, the water can cause certain damage to the strength of the filling body; insufficient strength of the filling body can result in insufficient support of the overlying surrounding rock by the filling material after setting and hardening.
To ensure good flow of the filler material, the solids content of the conventional cementitious filler slurry is generally controlled to be 40 wt% to 80 wt%, which often has two undesirable effects: on one hand, the solid content of the cemented filling material slurry is too low, so that a large amount of water can be analyzed out after the filling material slurry is conveyed into a filling area, and the surrounding environment is damaged; on the other hand, if the solid content of the cemented filling material slurry is too high, the problem of pipe blockage occurs during the conveying process, and the filling material cannot be conveyed to the filling area.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a high-fluidity high-solid content gangue cementing filling material and filling material slurry which are low in water consumption, good in fluidity and workability, stable in state, easy to convey for a long distance and a long time, do not shrink or slightly expand after being coagulated and hardened, and can be well topped, so that the problems that the underground operation environment is influenced after underground dehydration due to excessive water consumption of the filling material in the prior art, or pipe blockage occurs in the material conveying process due to poor fluidity and workability due to too low water consumption are solved.
In order to solve the technical problems, the invention provides the following technical scheme:
a coal gangue cemented filling material consists of coal gangue, cement, fly ash, auxiliary materials and a water reducing agent; 50-95 parts of coal gangue, 4-20 parts of cement, 1-50 parts of fly ash, 0.5-40 parts of auxiliary material and 0.05-5 parts of water reducer. The cemented filling material can obtain good fluidity with less water consumption, has certain strength after being solidified and hardened in a filling area, and can meet the requirements of filling mining and goaf filling on the mechanical properties of the filling material.
The coal gangue cementing and filling material is characterized in that the coal gangue consists of coal gangue fine aggregate and coal gangue coarse aggregate; the coal gangue fine aggregate is coal gangue particles with the particle size of more than 0 and less than or equal to 5mm, and the coal gangue coarse aggregate is coal gangue particles with the particle size of more than 5 and less than or equal to 15; the fine aggregate and the coarse aggregate are mixed for use, so that the fluidity of the cemented filling material is improved, and the strength of the cemented filling material after being solidified and hardened can meet the application requirement; the mass ratio of the coal gangue fine aggregate to the coal gangue coarse aggregate is 8: 2-5: 5. The cemented filling material consisting of the coal gangue aggregates in the proportion range has better fluidity under the condition that the water content is lower than 10 percent, and the mechanical property of the cemented filling material after the setting and hardening is also better.
The auxiliary material consists of the part A and/or the part B; the part A is tailings and/or aeolian sand; the part B is one or the mixture of two or more of slag micro powder, loess and bentonite. One or two or more of fly ash, slag micro powder, tailings, aeolian sand, loess and bentonite are mixed to serve as auxiliary materials, and the fluidity of the cemented filling material slurry can be effectively improved by adjusting the proportion of the auxiliary materials, so that the existing solid waste can be effectively utilized, the cemented filling material slurry is economical and environment-friendly, and the pressure of the solid waste on the environment is reduced.
The water reducing agent is one or a mixture of two or more of lignosulfonate water reducing agent, naphthalene water reducing agent, polycarboxylic acid water reducing agent, melamine water reducing agent, sulfamate water reducing agent, hydroxyl carboxylate, carbohydrate, glycerol, polyvinyl alcohol, sodium silicoaluminate or sulfanilic acid. The water reducing agent can further improve the fluidity of the cementing material, reduce the water consumption of the cementing material and improve the strength of the filling material after setting and hardening.
According to the coal gangue cementing and filling material, the mass ratio of the coal gangue fine aggregate to the coal gangue coarse aggregate is 7: 3.
According to the coal gangue cemented filling material, the specific surface area of the slag micro powder is more than or equal to 450m2/kg。
The particle size of the aeolian sand is 0.074-0.250 mm.
The coal gangue cementing and filling material comprises 50 parts by weight of coal gangue, 4 parts by weight of cement, 15.5 parts by weight of fly ash, 18 parts by weight of auxiliary materials and 0.075 part by weight of water reducing agent;
the coal gangue consists of coal gangue fine aggregate and coal gangue coarse aggregate; the coal gangue fine aggregate is coal gangue particles with the particle size of more than 0 and less than or equal to 5mm, and the coal gangue coarse aggregate is coal gangue particles with the particle size of more than 5 and less than or equal to 15; the mass ratio of the coal gangue fine aggregate to the coal gangue coarse aggregate is 7: 3;
the cement is P.O.32.5 ordinary Portland cement;
the auxiliary material consists of a part A and a part B, wherein the part A is aeolian sand, and the part B is slag micro powder and bentonite; 4 parts of aeolian sand, 7.5 parts of slag micro powder and 6.5 parts of bentonite; the particle size of the aeolian sand is 0.074-0.250 mm, and the specific surface area of the slag micro powder is more than or equal to 450m2/kg；
The water reducing agent is a naphthalene sulfonate formaldehyde condensate. The cemented filling material formed according to the proportion can be mixed with water to obtain the cemented filling material with the solid content of more than 90 percent, the filling material has good fluidity, the problem of pipe blockage does not occur when the cemented filling material is conveyed by a pipeline with the diameter phi of 75 m for 1000m, the bleeding rate is less than 2.5 percent, and the compressive strength of the cemented filling material after being solidified and hardened meets the application requirement.
A high-fluidity high-solid-content cemented filling material slurry consists of a coal gangue cemented filling material and water; the coal gangue cemented filling material consists of coal gangue, cement, fly ash, auxiliary materials and a water reducing agent; 50-95 parts of coal gangue, 4-20 parts of cement, 1-50 parts of fly ash, 0.5-40 parts of auxiliary material and 0.05-5 parts of water reducer; in the cementitious filler slurry: the mass fraction of the water is 7.8 wt% -10.0 wt%. The cementing filling material slurry has good fluidity and workability, stable state, easy long-distance transportation, no shrinkage and slight expansion after coagulation and hardening, and good topping property.
The high-fluidity high-solid-content cemented filling material slurry is prepared by the following steps in the coal gangue cemented filling material: 50 parts of coal gangue, 4 parts of cement, 15.5 parts of fly ash, 18 parts of auxiliary materials and 0.075 part of water reducer; in the cementitious filler slurry: the mass fraction of the water is 7.8 wt%;
the coal gangue consists of coal gangue fine aggregate and coal gangue coarse aggregate; the coal gangue fine aggregate is coal gangue particles with the particle size of more than 0 and less than or equal to 5mm, and the coal gangue coarse aggregate is coal gangue particles with the particle size of more than 5 and less than or equal to 15; the mass ratio of the coal gangue fine aggregate to the coal gangue coarse aggregate is 7: 3;
the cement is P.O.32.5 ordinary Portland cement;
the auxiliary material consists of a part A and a part B, wherein the part A is aeolian sand, and the part B is slag micro powder and bentonite; 4 parts of aeolian sand, 7.5 parts of slag micro powder and 6.5 parts of bentonite; particle size of the aeolian sandThe specific surface area of the slag micro powder is more than or equal to 450m and is between 0.074 and 0.250mm2/kg；
The water reducing agent is a naphthalene sulfonate formaldehyde condensate.
The technical scheme of the invention achieves the following beneficial technical effects:
(1) the cemented filling material can obtain good fluidity with less water consumption, has certain strength after being solidified and hardened in a filling area, and can meet the requirements of filling mining and goaf filling on the mechanical properties of the filling material. The fine aggregate and the coarse aggregate of the coal gangue in a specific proportion are mixed for use, so that the fluidity of the cemented filling material is improved, and the strength of the cemented filling material after being solidified and hardened can meet the application requirement; when the mass ratio of the coal gangue fine aggregate to the coal gangue coarse aggregate is 8: 2-5: 5, the formed cemented filling material slurry has good fluidity under the condition that the water content is lower than 10 wt%, and the mechanical property after the cemented filling material slurry is solidified and hardened is also good.
(2) The invention takes one or two or more of fly ash, slag micro powder, tailing, aeolian sand, loess and bentonite as auxiliary materials, and can effectively improve the fluidity of the cemented filling material slurry by adjusting the proportion of the auxiliary materials, thereby not only effectively utilizing the existing solid wastes, but also being economical and environment-friendly and reducing the pressure of the solid wastes on the environment.
(3) The invention makes full use of solid wastes such as coal gangue, fly ash, slag micro powder, tailing, aeolian sand and the like, thereby not only reducing the cost, but also effectively utilizing the solid wastes and realizing the cyclic utilization of resources. The addition of a proper amount of cement can ensure that the filling material can form a hardened body with certain strength after being solidified and hardened, and can also form an effective supporting effect on overlying surrounding rocks to prevent the collapse of a goaf; the addition of the fly ash and the bentonite can improve the pumpability of the filling material; the addition of a small amount of water reducing agent can improve the fluidity and water retention of the filling material, so that the filling material is easy to pipe and convey, and can improve the strength after condensation and hardening.
(4) The solid content of the cemented filling material slurry can be improved to over 90 percent by adjusting the material composition and the proportion, and simultaneously, the good fluidity is kept; the high-fluidity high-solid-content cemented filling material slurry has the water content of 7.8-10.0 wt%, the water content is obviously lower than that of the existing filling material, the fluidity and the workability are good, the state is stable, the high-fluidity high-solid-content cemented filling material slurry is easy to convey for a long distance and a long time, and the high-fluidity high-solid-content cemented filling material slurry does not shrink or slightly expand after being coagulated and hardened and can well top.
Detailed Description
Example 1
A coal gangue cemented filling material consists of coal gangue, cement, fly ash, auxiliary materials and a water reducing agent; 100kg of coal gangue, 15kg of cement, 30kg of fly ash, 25kg of slag micro powder as an auxiliary material and 0.45kg of water reducing agent; the specific surface area of the slag micro powder is more than or equal to 450m2The addition of the slag micro powder can obviously improve the workability of filling material slurry, reduce bleeding, improve the concentration of the filling material slurry and simultaneously keep good fluidity; the coal gangue consists of 70kg of coal gangue fine aggregate and 30kg of coal gangue coarse aggregate; the coal gangue fine aggregate is coal gangue particles with the particle size of more than 0 and less than or equal to 5mm, and the coal gangue coarse aggregate is coal gangue particles with the particle size of more than 5 and less than or equal to 15; the water reducing agent is naphthalene water reducing agent-naphthalene sulfonate formaldehyde condensation compound.
A high-fluidity high-solid content cemented filling material slurry is prepared by uniformly mixing 170.45kg of cemented filling material and 18.89kg of water; the solids content of the cementitious filler slurry was 90.02 wt%.
The cemented filling material slurry was subjected to index testing, and the results are shown in table 1. As can be seen from table 1, the cementitious filling material prepared in this example has good workability, stable state, good compressive strength after setting and hardening, and good top-forming property.
The construction test of the cemented filling material slurry of the embodiment was carried out, and the cemented filling material slurry of the embodiment was transported by using a steel pipe with an inner diameter of phi 135 and a length of 500m at a construction site in an environment with an air temperature of 20 ℃ and an air humidity of 60%, and continuously pumped for 8 hours under a pumping pressure of 6.9MPa, and no pipe blockage phenomenon was found, which indicates that the cemented filling material slurry prepared in the embodiment has good fluidity in a pipeline.
Example 2
A coal gangue cemented filling material consists of coal gangue, cement, fly ash, auxiliary materials and a water reducing agent; 100kg of coal gangue, 8kg of cement, 25kg of fly ash, 25kg of aeolian sand as an auxiliary material and 0.41kg of water reducing agent; the coal gangue consists of 70kg of coal gangue fine aggregate and 30kg of coal gangue coarse aggregate; the coal gangue fine aggregate is coal gangue particles with the particle size of more than 0 and less than or equal to 5mm, and the coal gangue coarse aggregate is coal gangue particles with the particle size of more than 5 and less than or equal to 15; the water reducing agent is a naphthalene water reducing agent-naphthalene sulfonate formaldehyde condensation compound; the grain size of the aeolian sand particles is mainly distributed between 0.074 mm and 0.250mm, structural gaps formed by coarse and fine aggregates of the coal gangue can be filled, and meanwhile, the whole water consumption of the filling material can be reduced due to the addition of the aeolian sand because the water absorption of the aeolian sand is very low, and the concentration of filling slurry is improved.
A high-fluidity high-solid content cemented filling material slurry is prepared by uniformly mixing 158.41kg of cemented filling material and 13.74kg of water; the solids content of the cementitious filler slurry was 92.02 wt%.
The cemented filling material slurry was subjected to index testing, and the results are shown in table 1. The cementing and filling material prepared by the embodiment has the advantages of good workability and stable state, has good compressive strength after being solidified and hardened, and can be well topped.
In addition, the cemented filling material slurry of the embodiment was subjected to construction tests, and transported by using a steel pipe with an inner diameter of phi 75 and a length of 350m in an environment with an air temperature of 21 ℃ and an air humidity of 55% at a construction site, and continuously pumped for 10 hours under a pumping pressure of 6.5MPa, and no pipe blockage phenomenon was found, which indicates that the cemented filling material slurry prepared in the embodiment has good fluidity during pipeline transportation.
Example 3
A coal gangue cemented filling material consists of coal gangue, cement, fly ash, auxiliary materials and a water reducing agent; 100kg of coal gangue, 10kg of cement, 25kg of fly ash, 25kg of loess as an auxiliary material and 0.38kg of water reducing agent; the coal gangue consists of 70kg of coal gangue fine aggregate and 30kg of coal gangue coarse aggregate; the coal gangue fine aggregate is coal gangue particles with the particle size of more than 0 and less than or equal to 5mm, and the coal gangue coarse aggregate is coal gangue particles with the particle size of more than 5 and less than or equal to 15; the water reducing agent is naphthalene water reducing agent-naphthalene sulfonate formaldehyde condensation compound.
A high-fluidity high-solid content cemented filling material slurry is prepared by uniformly mixing 160.38kg of cemented filling material and 13.62kg of water; the solids content of the cementitious filler slurry was 92.17 wt%.
The cemented filling material slurry was subjected to index testing, and the results are shown in table 1. The cementing and filling material prepared by the embodiment has the advantages of good workability and stable state, has good compressive strength after being solidified and hardened, and can be well topped.
In addition, the cemented filling material slurry of the embodiment is subjected to construction test, and is transported by using a steel pipe with an inner diameter of phi 105 and a length of 270m in an environment with an air temperature of 19 ℃ and an air humidity of 75% at a construction site, and is continuously pumped for 12 hours under the condition that the pumping pressure is 6.3Mpa, and no pipe blockage phenomenon is found, which indicates that the cemented filling material slurry prepared by the embodiment has good fluidity in the pipeline transportation process.
Example 4
A coal gangue cemented filling material consists of coal gangue, cement, fly ash, auxiliary materials and a water reducing agent; 100kg of coal gangue, 8kg of cement, 30kg of fly ash and auxiliary materials consisting of aeolian sand and loess, wherein the aeolian sand is 15kg, the loess is 15kg, and the water reducing agent is 0.35 kg; the coal gangue consists of 70kg of coal gangue fine aggregate and 30kg of coal gangue coarse aggregate; the coal gangue fine aggregate is coal gangue particles with the particle size of more than 0 and less than or equal to 5mm, and the coal gangue coarse aggregate is coal gangue particles with the particle size of more than 5 and less than or equal to 15; the water reducing agent is naphthalene water reducing agent-naphthalene sulfonate formaldehyde condensation compound.
A high-fluidity high-solid content cemented filling material slurry is prepared by uniformly mixing 168.35kg of cemented filling material and 14.65kg of water; the solids content of the cementitious filler slurry was 91.99 wt%.
The cemented filling material slurry was subjected to index testing, and the results are shown in table 1. The cementing and filling material prepared by the embodiment has the advantages of good workability and stable state, has good compressive strength after being solidified and hardened, and can be well topped.
In addition, the cemented filling material slurry of the embodiment was subjected to construction tests, and transported by using a steel pipe with an inner diameter of phi 75 and a length of 460m in an environment with an air temperature of 24 ℃ and an air humidity of 30% at a construction site, and continuously pumped for 9 hours under a pumping pressure of 6.8MPa, and no pipe blockage phenomenon was found, which indicates that the cemented filling material slurry prepared in the embodiment has good fluidity during pipeline transportation.
Example 5
A coal gangue cemented filling material consists of coal gangue, cement, fly ash, auxiliary materials and a water reducing agent; 100kg of coal gangue, 9kg of cement, 31kg of fly ash, 25kg of bentonite as an auxiliary material and 0.25kg of water reducing agent; the coal gangue consists of 70kg of coal gangue fine aggregate and 30kg of coal gangue coarse aggregate; the coal gangue fine aggregate is coal gangue particles with the particle size of more than 0 and less than or equal to 5mm, and the coal gangue coarse aggregate is coal gangue particles with the particle size of more than 5 and less than or equal to 15; the water reducing agent is naphthalene water reducing agent-naphthalene sulfonate formaldehyde condensation compound.
A high-fluidity high-solid content cemented filling material slurry is prepared by uniformly mixing 165.25kg of cemented filling material and 14.75kg of water; the solids content of the cementitious filler slurry was 91.81 wt%.
The cemented filling material slurry was subjected to index testing, and the results are shown in table 1. The cementing and filling material prepared by the embodiment has the advantages of good workability and stable state, has good compressive strength after being solidified and hardened, and can be well topped.
In addition, the cemented filling material slurry of the embodiment was subjected to construction tests, and transported by using a steel pipe with an inner diameter of phi 75 and a length of 420m in an environment with an air temperature of 26 ℃ and an air humidity of 47% at a construction site, and continuously pumped for 11 hours under a pumping pressure of 6.2MPa, and no pipe blockage phenomenon was found, which indicates that the cemented filling material slurry prepared in the embodiment has good fluidity during pipeline transportation.
Example 6
A coal gangue cemented filling material consists of coal gangue, cement, fly ash, auxiliary materials and a water reducing agent; 100kg of coal gangue, 8kg of cement, 31kg of common portland cement of P.O.32.5 and 31kg of fly ash, wherein the auxiliary materials comprise 8kg of aeolian sand, 15kg of slag micro powder and 13kg of bentonite, and 0.15kg of water reducing agent; the coal gangue consists of 70kg of coal gangue fine aggregate and 30kg of coal gangue coarse aggregate; the coal gangue fine aggregate is coal gangue particles with the particle size of more than 0 and less than or equal to 5mm, and the coal gangue coarse aggregate is coal gangue particles with the particle size of more than 5 and less than or equal to 15; the specific surface area of the slag micro powder is more than or equal to 450m2Per kg; the grain size of the aeolian sand particles is mainly distributed in the range of 0.074-0.250 mm; the slag micro powder has a loose and porous structure and can absorb and store certain moisture; the bentonite becomes pasty after absorbing water and can block micropores on the slag, compared with loess and other soils with larger viscosity after absorbing water, the bentonite has weaker micropore blocking capability on slag micro powder, and water in slag micropores can break away the pasty bentonite during pumping to moisten the pipe wall of a conveying pipeline, so that the conveying distance and the conveying time are prolonged, and the pipe blocking phenomenon in the pumping process is avoided; the water reducing agent is naphthalene water reducing agent-naphthalene sulfonate formaldehyde condensation compound.
A high-fluidity high-solid content cemented filling material slurry is prepared by uniformly mixing 175.15kg of cemented filling material and 14.85kg of water; the solids content of the cementitious filler slurry was 92.18 wt%.
The cemented filling material slurry was subjected to index testing, and the results are shown in table 1. The cementing and filling material prepared by the embodiment has the advantages of good workability and stable state, has good compressive strength after being solidified and hardened, and can be well topped.
In addition, the cemented filling material slurry of the embodiment is subjected to construction test, and is transported by using a steel pipe with an inner diameter of phi 75 and a length of 1000m in an environment with an air temperature of 25 ℃ and an air humidity of 37% at a construction site, and is continuously pumped for 13 hours under the condition that the pumping pressure is 6.2MPa, and no pipe blockage phenomenon is found, which indicates that the cemented filling material slurry prepared by the embodiment has better fluidity in the pipeline transportation process.
TABLE 1
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.
Claims (10)
1. The coal gangue cemented filling material is characterized by comprising coal gangue, cement, fly ash, auxiliary materials and a water reducing agent; 50-95 parts of coal gangue, 4-20 parts of cement, 1-50 parts of fly ash, 0.5-40 parts of auxiliary material and 0.05-5 parts of water reducer.
2. The coal gangue cemented filling material as claimed in claim 1, wherein the coal gangue consists of coal gangue fine aggregate and coal gangue coarse aggregate; the coal gangue fine aggregate is coal gangue particles with the particle size of more than 0 and less than or equal to 5mm, and the coal gangue coarse aggregate is coal gangue particles with the particle size of more than 5 and less than or equal to 15; the mass ratio of the coal gangue fine aggregate to the coal gangue coarse aggregate is 8: 2-5: 5.
3. The coal gangue cemented filling material as claimed in claim 1, wherein the auxiliary material consists of part a and/or part B; the part A is tailings and/or aeolian sand; the part B is one or the mixture of two or more of slag micro powder, loess and bentonite.
4. The coal gangue cementitious filling material as defined in claim 1, wherein the water reducing agent is one or a mixture of two or more of lignosulfonate water reducing agent, naphthalene water reducing agent, polycarboxylic acid water reducing agent, melamine water reducing agent, sulfamate water reducing agent, hydroxycarboxylic acid salt, carbohydrate, glycerol, polyvinyl alcohol, sodium silicoaluminate and sulfanilic acid.
5. The coal gangue cemented filling material as claimed in claim 2, wherein the mass ratio of the coal gangue fine aggregate to the coal gangue coarse aggregate is 7: 3.
6. The coal gangue cemented filling material as claimed in claim 3, wherein the specific surface area of the slag micropowder is not less than 450m2/kg。
7. The coal gangue cemented filling material as claimed in claim 3, wherein the aeolian sand has a particle size of 0.074-0.250 mm.
8. The coal gangue cemented filling material according to claim 3, characterized in that 50 parts by weight of the coal gangue, 4 parts by weight of the cement, 15.5 parts by weight of the fly ash, 18 parts by weight of the auxiliary materials and 0.075 part by weight of the water reducing agent are added;
the coal gangue consists of coal gangue fine aggregate and coal gangue coarse aggregate; the coal gangue fine aggregate is coal gangue particles with the particle size of more than 0 and less than or equal to 5mm, and the coal gangue coarse aggregate is coal gangue particles with the particle size of more than 5 and less than or equal to 15; the mass ratio of the coal gangue fine aggregate to the coal gangue coarse aggregate is 7: 3;
the cement is P.O.32.5 ordinary Portland cement;
the auxiliary material consists of a part A and a part B, wherein the part A is aeolian sand, and the part B is slag micro powder and bentonite; 4 parts of aeolian sand, 7.5 parts of slag micro powder and 6.5 parts of bentonite; the particle size of the aeolian sand is 0.074-0.250 mm, and the specific surface area of the slag micro powder is more than or equal to 450m2/kg；
The water reducing agent is a naphthalene sulfonate formaldehyde condensate.
9. The high-fluidity high-solid-content cemented filling material slurry is characterized by comprising a coal gangue cemented filling material and water; the coal gangue cemented filling material consists of coal gangue, cement, fly ash, auxiliary materials and a water reducing agent; 50-95 parts of coal gangue, 4-20 parts of cement, 1-50 parts of fly ash, 0.5-40 parts of auxiliary material and 0.05-5 parts of water reducer; in the cementitious filler slurry: the mass fraction of the water is 7.8 wt% -10.0 wt%.
10. A high flow, high solids content cementitious filler slurry according to claim 9, wherein in the coal gangue cementitious filler: 50 parts of coal gangue, 4 parts of cement, 15.5 parts of fly ash, 18 parts of auxiliary materials and 0.075 part of water reducer; in the cementitious filler slurry: the mass fraction of the water is 7.8 wt%;
the coal gangue consists of coal gangue fine aggregate and coal gangue coarse aggregate; the coal gangue fine aggregate is coal gangue particles with the particle size of more than 0 and less than or equal to 5mm, and the coal gangue coarse aggregate is coal gangue particles with the particle size of more than 5 and less than or equal to 15; the mass ratio of the coal gangue fine aggregate to the coal gangue coarse aggregate is 7: 3;
the cement is P.O.32.5 ordinary Portland cement;
the auxiliary material consists of a part A and a part B, wherein the part A is aeolian sand, and the part B is slag micro powder and bentonite; 4 parts of aeolian sand, 7.5 parts of slag micro powder and 6.5 parts of bentonite; the particle size of the aeolian sand is 0.074-0.250 mm, and the specific surface area of the slag micro powder is more than or equal to 450m2/kg；
The water reducing agent is a naphthalene sulfonate formaldehyde condensate.
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