CN105541222A - High strength environment friendly sprayed concrete - Google Patents
High strength environment friendly sprayed concrete Download PDFInfo
- Publication number
- CN105541222A CN105541222A CN201510979293.7A CN201510979293A CN105541222A CN 105541222 A CN105541222 A CN 105541222A CN 201510979293 A CN201510979293 A CN 201510979293A CN 105541222 A CN105541222 A CN 105541222A
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- CN
- China
- Prior art keywords
- sprayed concrete
- concrete
- parts
- sprayed
- reduced
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- 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
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
-
- 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
Landscapes
- 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)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to underground concrete for a coal mine, in particular to high strength environment friendly sprayed concrete, which solves the problems of safety loophole, higher roadway overhaul rate and high support cost of the existing shaft sprayed concrete. The high strength environment friendly sprayed concrete is prepared from a binding material and an accelerator which is 5% of mass percent of the binding material; the binding material is prepared from the following raw materials in parts by weight: 9 parts of 32.5 Portland cements, 1 part of MK-1 fortifier, 20 parts of machine-made sand, and 20 parts of detritus. The strength of the sprayed concrete can be obviously improved, sprayed disability and dust concentration can be reduced, morbidity of silicosis is reduced, surrounding rock deformation can be effectively controlled, roadway overhaul can be reduced, an underground roadway appearance is improved, safety production of a shaft is ensured, support cost is obviously reduced and economic benefits are obvious.
Description
Technical field
The present invention relates to underground coal mine supporting concrete, be specially a kind of high-strength environment-friendly sprayed concrete.
Background technology
Sprayed concrete is that a kind of one developing ground structures reinforcing from Roadway Support Technology reinforces means efficiently and effectively, coal mine down-hole tunnel supporting many employings Bolt net and jet penetrates concrete, due to the impact of accelerating chemicals, the design grade of sprayed concrete is generally C20, simultaneously, during owing to spraying, operator lack a sense of responsibility, concrete mixing is lack of standardization, spray the impact of the factors such as manual manipulation method is improper, maintenance is defective, and actual strength also can decline about 20%.
Intensity is that the common sprayed concrete of about 20MPa presses little mine substantially can adapt to for superficial part, but due to the mine that fragility is large, cohesive force is not strong, often can ftracture, scaling, the breakoff phenomenon such as de-block, add tunnel revision rate, have impact on coal production, add the expense of overhauling; And spray on-the-spot chaotic state in which corrupt practices prevail, low visibility, not only there is potential safety hazard, also have a strong impact on the healthy of miner.
Summary of the invention
There is the higher and problem that support cost is higher of potential safety hazard, tunnel revision rate to solve existing mine sprayed concrete in the present invention, provides a kind of high-strength environment-friendly sprayed concrete.
The present invention adopts following technical scheme to realize: high-strength environment-friendly sprayed concrete, is made up of gelling material and accelerating chemicals, and the mass percentage of accelerating chemicals is 5% of gelling material; Gelling material is made up of the raw material of following mass fraction: 32.5 silicate cements 9 parts, MK-1 toughener 1 part, Machine-made Sand 20 parts; Rubble 20 parts.
MK-1 toughener and content thereof choose the ultimate compression strength that can increase substantially sprayed concrete, and MK-1 toughener and accelerating chemicals are applied in sprayed concrete formula simultaneously, reduce shotcrete dust concentration, the choosing of this concrete component and content is through that a large amount of test repeatedly draws, overcomes existing mine sprayed concrete and there is the higher and problem that support cost is higher of potential safety hazard, tunnel revision rate.
The present invention can significantly improve sprayed concrete strength, reduce and spray rebound degree and dust concentration, reduce the sickness rate of silicosis, and can effective deformation controlling for rock surrounding gateways, reduce tunnel to overhaul, improve underworkings looks, ensure the safety in production of mine, can significantly reduce supporting expense, remarkable in economical benefits simultaneously.
The label of the sprayed concrete adopting said components and content to obtain reaches C40, and dust concentration reduces by 80%, sprays rebound degree and reduces by 10%.
Embodiment
High-strength environment-friendly sprayed concrete, is made up of gelling material and accelerating chemicals, and the mass percentage of accelerating chemicals is 5% of gelling material; Gelling material is made up of the raw material of following mass fraction: 32.5 silicate cements 9 parts, MK-1 toughener 1 part, Machine-made Sand 20 parts; Rubble 20 parts.
In specific implementation process, MK-1 toughener is that Jiaozuo City Yu Kun mining industry company limited produces.
The consumptive use of water normal consistence (%) of 32.5 silicate cements is 27.0, initial set 2h35min, final set 4h10min, and fineness is 3.0%; Folding strength (Mpa): 3 days be 5.3,28 days be 8.5; Ultimate compression strength (Mpa): 3 days be 21.8,28 days be 40.4; (Jiaozuo City Zhong Wu engineering detecting limited liability company cement test report, project that this batch of ordinary Portland cement is examined is qualified by GB175-1999 standard test).
It is 3.0 that the fineness of Machine-made Sand touches number, clod content (%): 0.0, soundness (crush index %): 15.
Clod content in rubble: 0.1, silt content: 0.2, maximum particle diameter: 10mm.
Accelerating chemicals is selected and is advocated moral board accelerating chemicals, and middle coal the tenth engineering department accelerating chemicals factory produces.
Test under normal curing condition according to normal concrete mechanical test method (GB/T50081-2002), the conclusion drawn is: along with MK-1 toughener replaces the amount of cement to increase, concrete early strength (1 day and 3 days) declines all to some extent; 7d intensity and 10d start to occur raising, and are all greater than benchmark sample, the increase of 28d intensity MK-1 toughener consumption and raising, and ultimate compression strength improves 40.1%.
According to GB/T50081-2002 standard for test methods of mechanical properties of ordinary concrete, 100mm × 100mm × 100mm test specimen is selected to test, curing condition: temperature 18 ° of C ~ 33 ° C, sample is covered with wet cloth, keep moist between preserving period, draw following rule: concrete 3 days and 7 days intensity all improve than benchmark sample, but, 3 days intensity comparatively benchmark sample improves little, and 7 days intensity comparatively benchmark sample is improved largely; When using 32.5 silicate cement, within concrete 28 days, intensity reaches 42.1Mpa, improves 49.8%, and when using 42.5 silicate cement, within concrete 28 days, intensity reaches 53.2, improves 39.3%.
With reference to the standard of GB " shotcrete accelerator ", test during ° C in temperature 15 ° of C ~ 29, MK-1 toughener can shorten initial set and the final setting time of cement paste significantly, has the effect obviously reducing concrete ejection resilience.
With reference to GB/T50081-2002 standard for test methods of mechanical properties of ordinary concrete, select 100mm × 100mm × 100mm test specimen, at temperature 18 ° of C ~ 33 ° C, sample is covered with wet cloth, test under keeping the condition of humidity between preserving period, reduce accelerating chemicals consumption, do not affect the early strength of sprayed concrete, and concrete 28 days intensity can be significantly improved, reduce the particular case of accelerating chemicals consumption to raising 28 days intensity as follows: when utilizing 32.5 silicate cements and MK-1 toughener preparation C30 sprayed concrete, when accelerating chemicals accounts for 5% of gelling material, concrete 28 days intensity can be made to bring up to 42.9Mpa by 39.9Mpa, improve 3Mpa, 28 days intensity is made (not add MK-1 to basic sample, do not reduce accelerating chemicals consumption) increase rate bring up to 52.7% by 42%, contribute 10.7 percentage points.
Claims (1)
1. a high-strength environment-friendly sprayed concrete, is characterized in that: be made up of gelling material and accelerating chemicals, and the mass percentage of accelerating chemicals is 5% of gelling material; Gelling material is made up of the raw material of following mass fraction: 32.5 silicate cements 9 parts, MK-1 toughener 1 part, Machine-made Sand 20 parts; Rubble 20 parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510979293.7A CN105541222A (en) | 2015-12-23 | 2015-12-23 | High strength environment friendly sprayed concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510979293.7A CN105541222A (en) | 2015-12-23 | 2015-12-23 | High strength environment friendly sprayed concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105541222A true CN105541222A (en) | 2016-05-04 |
Family
ID=55820848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510979293.7A Pending CN105541222A (en) | 2015-12-23 | 2015-12-23 | High strength environment friendly sprayed concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105541222A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109437736A (en) * | 2018-11-23 | 2019-03-08 | 中交第三航务工程局有限公司南京分公司 | A kind of Machine-made Sand fibrous shotcrete and its construction technology for being served as a contrast at the beginning of tunnel |
| CN112479650A (en) * | 2020-11-20 | 2021-03-12 | 中铁二十局集团有限公司 | Desert sand sprayed concrete and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103086672A (en) * | 2013-02-18 | 2013-05-08 | 中国水利水电第七工程局有限公司 | Wet spraying concrete and production method thereof |
| CN103224364A (en) * | 2013-04-16 | 2013-07-31 | 西南交通大学 | Low carbon and high performance series concrete special for tunnel spraying |
| CN103626444A (en) * | 2012-08-27 | 2014-03-12 | 沈保国 | Construction process of steel fiber shotcrete |
| CN103708782A (en) * | 2013-12-21 | 2014-04-09 | 兖州煤业股份有限公司 | Concrete guniting material |
-
2015
- 2015-12-23 CN CN201510979293.7A patent/CN105541222A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103626444A (en) * | 2012-08-27 | 2014-03-12 | 沈保国 | Construction process of steel fiber shotcrete |
| CN103086672A (en) * | 2013-02-18 | 2013-05-08 | 中国水利水电第七工程局有限公司 | Wet spraying concrete and production method thereof |
| CN103224364A (en) * | 2013-04-16 | 2013-07-31 | 西南交通大学 | Low carbon and high performance series concrete special for tunnel spraying |
| CN103708782A (en) * | 2013-12-21 | 2014-04-09 | 兖州煤业股份有限公司 | Concrete guniting material |
Non-Patent Citations (3)
| Title |
|---|
| 冯乃谦等: "增强剂在水泥混凝土中的作用机理", 《混凝土与水泥制品》 * |
| 王福军等: "多元复合增强剂对高性能混凝土工程性能的影响", 《建材世界》 * |
| 贺拿等: "MK-1高效增强剂在巷道锚喷支护中的应用", 《中国煤炭》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109437736A (en) * | 2018-11-23 | 2019-03-08 | 中交第三航务工程局有限公司南京分公司 | A kind of Machine-made Sand fibrous shotcrete and its construction technology for being served as a contrast at the beginning of tunnel |
| CN112479650A (en) * | 2020-11-20 | 2021-03-12 | 中铁二十局集团有限公司 | Desert sand sprayed concrete and preparation method thereof |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160504 |
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| RJ01 | Rejection of invention patent application after publication |