CN115417645A - Green grouting material prepared from tailing sand and preparation method thereof - Google Patents
Green grouting material prepared from tailing sand and preparation method thereof Download PDFInfo
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- CN115417645A CN115417645A CN202211193246.6A CN202211193246A CN115417645A CN 115417645 A CN115417645 A CN 115417645A CN 202211193246 A CN202211193246 A CN 202211193246A CN 115417645 A CN115417645 A CN 115417645A
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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
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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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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- 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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a green grouting material prepared from tailing sand, and belongs to the technical field of building materials. The grouting material is prepared from the following raw materials in parts by weight: 180-220 parts of cement, 400-500 parts of fly ash, 550-650 parts of tailing sand, 530-590 parts of stone powder, 340-400 parts of water and 10-50 parts of performance regulator; the performance regulator consists of polyacrylamide, a water reducing agent, a calcium sulphoaluminate expanding agent and silicon powder. According to the invention, the tailing sand is adopted to replace the traditional used sand, so that the negative influence of the tailing sand on the surrounding environment is eliminated, the treatment cost of the goaf is reduced, and the prepared grouting material has the advantages of short setting time, good workability, good stability, micro-expansion and fast strength increase, and is particularly suitable for treating the goaf of the cavity type.
Description
Technical Field
The invention relates to a green grouting material prepared from tailing sand and a preparation method thereof, belonging to the technical field of building materials.
Background
Mineral resources in China are rich, the mining quantity of coal, iron ore and other mineral products is huge, and an underground goaf is formed in a mined area, so that space and surrounding rock are easy to destabilize, crack and collapse, even an overlying rock layer sinks and deforms integrally, finally the ground collapses, and the safety of surrounding buildings, roads and infrastructures in service is seriously threatened. Therefore, goaf management is an important problem to be solved urgently in our national modernization construction.
The existing common goaf treatment methods include an underground backfill method, an excavation backfill method and a pressure grouting filling method. The underground backfilling method needs to be carried out in a roadway of the goaf, and a top plate is required to have higher bearing capacity; the excavation backfill method is only suitable for burying a shallow and deep goaf and has high cost; the grouting method has low requirements on construction conditions and wide application range, is a treatment method which is most widely applied and has the most mature technology, and is particularly suitable for treating goafs with larger burial depth and mostly caving and breaking.
The following grouting materials are commonly used for treating the goaf: cement-water glass grout, cement-coarse aggregate grout and cement-fly ash grout. Wherein, the cement-water glass grout is generally used for controlling the grouting range during curtain grouting; cement-coarse aggregate type slurry is commonly used for treating the cavity type goaf, but because coarse aggregate is heavy, the slurry fluidity is limited, and cavities at deeper and distant positions cannot be filled fully, the filling effect is not ideal, and certain limitation exists; the cement-fly ash slurry is one of the most commonly used grouting materials for goaf treatment at present due to wide material sources and low cost, is particularly suitable for treating caving and fracture zones of the goaf and overlying strata, but has the defects of long setting time, difficulty in accurate control, high bleeding rate, poor stability, low strength increasing speed, shrinkage, void caused by shrinkage and the like.
On the other hand, sand is generally used in the currently adopted grouting material, but the price of the sand is higher in the market. A large amount of waste tailing sand is usually arranged around the mineral gob, and influences the surrounding ecological environment. Therefore, if a green grouting material prepared by using waste tailing sand can be developed, the green grouting material has the advantages of short setting time, good workability, good stability, micro-expansion and quick strength increase, and has important application value.
Disclosure of Invention
The invention aims to solve the defects of the prior art, provides a green grouting material prepared from tailing sand, has short setting time, good workability, good stability, slight expansion and quick strength increase, and is particularly suitable for treating a cavity type goaf.
The invention also aims to provide a preparation method of the green grouting material.
Technical scheme
A green grouting material prepared from tailing sand is prepared from the following raw materials in parts by weight: 180-220 parts of cement, 400-500 parts of fly ash, 550-650 parts of tailing sand, 530-590 parts of stone powder, 340-400 parts of water and 10-50 parts of performance regulator;
the performance regulator consists of polyacrylamide, a water reducing agent, a calcium sulphoaluminate expanding agent and silicon powder.
Furthermore, in the performance regulator, the weight ratio of the polyacrylamide, the water reducing agent, the calcium sulphoaluminate expanding agent and the silicon powder is (5-10) to (9-15) to (60-90).
Further, the cement is P.O42.5 ordinary portland cement.
Further, the fly ash is class III F fly ash.
Further, the tailing sand is iron tailing sand with the particle size of less than 5mm, and the stacking density is 1.3-1.6 g/cm 3 。
Furthermore, the particle size of the stone powder is less than 0.16mm, and the apparent density is 2.6-2.8 g/cm 3 。
Further, the silicon powder is preparedThe specific surface area is 15 to 20m 2 /g，SiO 2 The content is 90-99%.
The preparation method of the green grouting material comprises the following steps: sequentially adding the tailing sand, the stone powder, the cement, the fly ash and the performance regulator into a stirrer according to the formula amount, stirring for 10-60 s, adding water, and continuously stirring for 2-5 min to obtain the grouting material.
Furthermore, the rotating speed of the stirrer is 40-50 r/min.
Compared with the existing grouting material, the green grouting material has the following beneficial effects:
(1) The tailing sand adopted by the invention is waste material generated in the process of mineral exploitation, and is generally piled at the periphery of the goaf and applied to the grouting material for goaf treatment, so that the cyclic utilization of resources is realized, the negative influence of the tailing sand on the surrounding environment is eliminated, and the treatment cost of the goaf is reduced;
(2) The performance regulator of the grouting material adopts Polyacrylamide (PAM), wherein the PAM is a linear high polymer and can be dissociated into a long molecular chain when meeting water, and the physical, chemical and mechanical actions can be generated between the PAM molecular chain and the grouting material, so that the PAM molecular chain and the grouting material are linked and interwoven to form a space network structure, thereby enhancing the cohesiveness and the water retention of the grouting material;
(3) The performance regulator of the grouting material adopts calcium sulphoaluminate expanding agent, and the expanding agent can generate more ettringite to compensate the shrinkage of the cement stone in the cement hydration process, thereby eliminating the phenomenon of void of a filling area caused by the shrinkage of the grouting material.
Drawings
FIG. 1 is a photograph showing the state of the mixture of the grouting materials of examples 1 to 3 and comparative example 1.
Detailed Description
The technical scheme of the invention is clearly and completely explained by combining the attached drawings and the specific embodiment.
It is worth to be noted that in the following examples, all the adopted cements are p.o42.5 ordinary portland cement, and all the fly ashes are class iii class F fly ashes; all the adopted water reducing agents are naphthalene water reducing agents; tailThe ore sand is iron tailing sand with the bulk density of 1.42g/cm 3 The particle size distribution is shown in table 1; the adopted stone powder is limestone powder with the apparent density of 2.64g/cm 3 The particle size distribution is shown in table 2; the specific surface area of the silicon powder is 18.7m 2 /g，SiO 2 The content is 96.1%, but is not limited thereto;
TABLE 1 tailing sand particle size distribution
| Mesh opening (mm) | 5 | 2.5 | 1.25 | 0.63 | 0.315 | 0.16 | 0.08 | Screen bottom |
| Cumulative screen residue (%) | 0.1 | 0.4 | 0.6 | 1.1 | 4.1 | 27.0 | 69.5 | 100 |
TABLE 2 grading of stone dust particles
| Mesh opening (mm) | 0.16 | 0.08 | 0.045 | Screen bottom |
| Cumulative screen residue (%) | 0 | 13 | 48 | 100 |
Example 1
A green grouting material prepared from tailing sand is prepared from the following raw materials in parts by weight: 196 parts of cement, 462 parts of fly ash, 577 parts of tailing sand, 577 parts of stone powder, 378 parts of water and 29.4 parts of a performance regulator; the performance regulator consists of polyacrylamide, a water reducing agent, a calcium sulphoaluminate expanding agent and silicon powder in a weight ratio of 9.
The preparation method of the green grouting material comprises the following steps: sequentially adding the tailing sand, the stone powder, the cement, the fly ash and the performance regulator into a stirrer according to the formula amount, stirring for 15s at the speed of 48r/min, adding water, and continuously stirring for 3min to obtain the grouting material.
Example 2
A green grouting material prepared from tailing sand is prepared from the following raw materials in parts by weight: 196 parts of cement, 462 parts of fly ash, 577 parts of tailing sand, 577 parts of stone powder, 378 parts of water and 29.4 parts of performance regulator; the performance regulator consists of 8-80 parts by weight of polyacrylamide, a water reducing agent, a calcium sulphoaluminate expanding agent and silicon powder.
The preparation method of the green grouting material comprises the following steps: sequentially adding the tailing sand, the stone powder, the cement, the fly ash and the performance regulator into a stirrer according to the formula amount, stirring for 15s at the speed of 48r/min, adding water, and continuously stirring for 3min to obtain the grouting material.
Example 3
A green grouting material prepared from tailing sand is prepared from the following raw materials in parts by weight: 210 parts of cement, 448 parts of fly ash, 610 parts of tailing sand, 550 parts of stone powder, 375 parts of water and 26.5 parts of performance regulator; the performance regulator consists of polyacrylamide, a water reducing agent, a calcium sulphoaluminate expanding agent and silicon powder in a weight ratio of 9.
The preparation method of the green grouting material comprises the following steps: sequentially adding the tailing sand, the stone powder, the cement, the fly ash and the performance regulator into a stirrer according to the formula amount, stirring for 15s at the speed of 48r/min, adding water, and continuously stirring for 3min to obtain the grouting material.
Comparative example 1
The grouting material commonly used in the existing goaf treatment is taken as a comparative example and is prepared from the following raw materials in parts by weight: 97 parts of cement, 194 parts of fly ash, 242 parts of sand, 242 parts of stone powder and 726 parts of water; wherein, the sand grading is shown in table 3:
TABLE 3 particle size distribution of sands
| Mesh opening (mm) | 5 | 2.5 | 1.25 | 0.63 | 0.315 | 0.16 | 0.08 | Screen bottom |
| Cumulative screen residue (%) | 5 | 18 | 30 | 49 | 92 | 98 | 99 | 100 |
The preparation method of the grouting material comprises the following steps: sequentially putting the sand, the stone powder, the cement and the fly ash into a stirrer according to the formula amount, stirring for 15s at the speed of 48r/min, adding water, and continuously stirring for 3min to obtain the grouting material.
The photographs of the state of the blends of the grouting materials of examples 1 to 3 and comparative example 1 are shown in fig. 1, and it can be seen that the grouting materials of examples 1 to 3 have good wrapping property, good cohesiveness and good pourability. The grouting material mixture of the comparative example 1 has the problems of segregation, bleeding, bone-slurry separation and the like, so the grouting material mixture has poor grouting performance, large volume shrinkage after slurry hardening, and uneven and non-compact material. Thus, the injectability of the grouting material mixture of the present invention has significant advantages.
Testing the expansibility, the setting time, the cement loss, the compressive strength and the vertical expansion rate of the grouting materials of examples 1 to 3 and a comparative example, wherein the tests of the expansibility and the setting time are implemented according to a related test method of grouting materials in JTS/T236-2019 concrete test detection technical Specification for water transportation engineering; the cement loss and the compressive strength are implemented by referring to a related test method of underwater undispersed concrete in JTS/T236-2019 technical Specification for testing concrete for water transportation engineering; the vertical expansion rate is implemented according to the method of GB/T50448-2015 technical Specification for application of cement-based grouting materials, and the test results are shown in Table 4:
table 4 comparison of the properties of the grouting materials of examples 1 to 3 with those of comparative example 1
As can be seen from the test results in Table 4, compared with the grouting material of comparative example 1, the grouting material mixture of the invention has obvious advantages of cohesiveness and water retention, good fluidity, shortened final setting time by 57% -64%, reduced cement loss by 65% -73%, improved compressive strength at 7d by 260% -360%, and improved compressive strength at 28d by 179% -207%; the vertical expansion ratio of 24h in comparative example 1 is negative, i.e., the test piece shrinks, while that in examples 1-3 is positive, i.e., the test piece expands. Therefore, the goaf grouting material can solve the problems of long setting time, high bleeding rate, poor stability, slow strength increase speed and void caused by shrinkage commonly existing in the current grouting material.
The grouting material disclosed by the invention utilizes the waste tailings sand near the goaf as a raw material, changes the waste tailings sand into valuables, realizes the cyclic utilization of resources, eliminates the negative influence of the tailings sand on the surrounding environment, saves the treatment cost of the goaf, and is a green environment-friendly grouting material.
Claims (9)
1. The green grouting material prepared from the tailing sand is characterized by being prepared from the following raw materials in parts by weight: 180-220 parts of cement, 400-500 parts of fly ash, 550-650 parts of tailing sand, 530-590 parts of stone powder, 340-400 parts of water and 10-50 parts of performance regulator; the performance regulator consists of polyacrylamide, a water reducing agent, a calcium sulphoaluminate expanding agent and silicon powder.
2. The green grouting material prepared from the tailings sand as claimed in claim 1, wherein the weight ratio of the polyacrylamide, the water reducing agent, the calcium sulphoaluminate expanding agent and the silicon powder in the performance regulator is (5-10): 9-15): 60-90.
3. A green grouting material prepared using tailings sand as claimed in claim 1, wherein the cement is p.o42.5 portland cement.
4. The green grouting material prepared from tailings sands as claimed in claim 1, wherein the fly ash is class iii class F fly ash.
5. The green grouting material prepared from the tailings sand according to claim 1, wherein the tailings sand has a particle size of less than 5mm and a bulk density of 1.3 to 1.6g/cm 3 。
6. The green grouting material prepared from the tailings sand according to claim 1, wherein the stone powder has a particle size of less than 0.16mm and an apparent density of 2.6 to 2.8g/cm 3 。
7. The green grouting material prepared from the tailings sand as claimed in any one of claims 1 to 6, wherein the specific surface area of the silica powder is 15 to 20m 2 /g，SiO 2 The content is 90-99%.
8. The preparation method of the green grouting material of any one of claims 1 to 7, characterized in that the tailing sand, the stone powder, the cement, the fly ash and the performance regulator are sequentially put into a stirrer according to the formula amount, and water is added after the mixture is stirred for 10 to 60s and is continuously stirred for 2 to 5min to obtain the grouting material.
9. The method for preparing green grouting material according to claim 8, wherein the rotation speed of the stirrer is 40-50 r/min.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000086318A (en) * | 1998-09-09 | 2000-03-28 | Denki Kagaku Kogyo Kk | Highly expandable grouting material |
| CN1840504A (en) * | 2005-04-01 | 2006-10-04 | 杜绍安 | Normal temperature consolidation materials for construction |
| CN109626897A (en) * | 2018-12-11 | 2019-04-16 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of injecting paste material and its technique for the regulation of ballastless track of high-speed railway roadbed grout |
| CN112723817A (en) * | 2020-12-09 | 2021-04-30 | 华新水泥股份有限公司 | High-fluidity adjustable-setting ready-mixed grouting mortar and preparation method thereof |
| KR102278926B1 (en) * | 2021-04-09 | 2021-07-19 | 주식회사 지에프시알엔디 | Grout material using carbon-based expansive admixture and construction method using the same |
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2022
- 2022-09-28 CN CN202211193246.6A patent/CN115417645B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000086318A (en) * | 1998-09-09 | 2000-03-28 | Denki Kagaku Kogyo Kk | Highly expandable grouting material |
| CN1840504A (en) * | 2005-04-01 | 2006-10-04 | 杜绍安 | Normal temperature consolidation materials for construction |
| CN109626897A (en) * | 2018-12-11 | 2019-04-16 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of injecting paste material and its technique for the regulation of ballastless track of high-speed railway roadbed grout |
| CN112723817A (en) * | 2020-12-09 | 2021-04-30 | 华新水泥股份有限公司 | High-fluidity adjustable-setting ready-mixed grouting mortar and preparation method thereof |
| KR102278926B1 (en) * | 2021-04-09 | 2021-07-19 | 주식회사 지에프시알엔디 | Grout material using carbon-based expansive admixture and construction method using the same |
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