CN103360005A - Sprayed concrete - Google Patents
Sprayed concrete Download PDFInfo
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- CN103360005A CN103360005A CN2013102945398A CN201310294539A CN103360005A CN 103360005 A CN103360005 A CN 103360005A CN 2013102945398 A CN2013102945398 A CN 2013102945398A CN 201310294539 A CN201310294539 A CN 201310294539A CN 103360005 A CN103360005 A CN 103360005A
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Abstract
The invention discloses a sprayed concrete comprising the components of cement, sand, pebbles, water, an accelerating agent and bundle-shaped monofilament polypropylene fibers. By utilizing the bundle-shaped monofilament polypropylene fibers with the mixing amount of 0.9kg/m<3>-1.5kg/m<3>, the splitting tensile strength and the rupture strength of the concrete can be effectively improved so as to meet the needs of civil engineering under mine.
Description
Technical field
The present invention relates to concrete field, be specially a kind of sprayed concrete.
Background technology
Concrete refers to by the gelling material cementing general designation that becomes whole engineered composite material of will gathering materials.Concrete is generally made gelling material with cement, and sand, masonry gather materials, and cooperates by a certain percentage with water (adding or do not add admixture and adulterant), forms through stirring, moulding, maintenance, also claims to be widely used in civil engineering work by normal concrete.Civil engineering work is had relatively high expectations to concrete tensile splitting strength, folding strength under the ore deposit, and existing normal concrete can't satisfy civil engineering work demand under the ore deposit.
Summary of the invention
The purpose of this invention is to provide a kind of sprayed concrete, to solve the prior art normal concrete in the problem that can't satisfy civil engineering work demand under the ore deposit on tensile splitting strength, the folding strength.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of sprayed concrete, it is characterized in that: component includes cement, sand, stone, water, accelerating chemicals, pencil monofilament polypropylene fibre, wherein the weight proportion of component cement, sand, stone, water is 1:1.84:1.84:0.45, the accelerating chemicals volume is 2% ~ 4% of cement weight, and polypropylene fiber is 0.9kg/m
3~ 1.5 kg/m
3
Described a kind of sprayed concrete is characterized in that: described cement preference label is not less than silicate cement or the ordinary Portland cement of P.O42.5.
Described a kind of sprayed concrete is characterized in that: the preferred fineness modulus of described sand is greater than 2.5 coarse sand.
Described a kind of sprayed concrete is characterized in that: described stone is selected cobble or rubble, preferred cobble, and the maximum particle diameter of stone is less than or equal to 15mm, and the silt content of stone is less than or equal to 10%.
Described a kind of sprayed concrete is characterized in that: described accelerating chemicals model is Red Star one type.
Volume 0.9 kg/m among the present invention
3~ 1.5 kg/m
3Pencil monofilament polypropylene fibre, can the concrete tensile splitting strength of Effective Raise, folding strength, thus can satisfy the demand of civil engineering work under the ore deposit.
Description of drawings
Fig. 1 is sprayed concrete displacement of the present invention-load curve figure.
Fig. 2 is sprayed concrete folding strength graphic representation of the present invention.
Embodiment
A kind of sprayed concrete, component includes cement, sand, stone, water, accelerating chemicals, pencil monofilament polypropylene fibre, wherein the weight proportion of component cement, sand, stone, water is 1:1.84:1.84:0.45, the accelerating chemicals volume is 2% ~ 4% of cement weight, and polypropylene fiber is 0.6 kg/m
3~ 1.5 kg/m
3
Among the present invention, the cement preference label is not less than silicate cement or the ordinary Portland cement of P.O42.5.Because the C of these two kinds of cement
3S and C
3A content is higher, and is good with the consistency of accelerating chemicals, energy rapid hardening, fast hard, and later strength is also higher.
Among the present invention, the preferred fineness modulus of sand is greater than 2.5 coarse sand.Sand is meticulous, and concrete drying shrinkage is increased; Sand is excessively thick, then can increase resilience.Particle less than 0.075mm in the sand should not surpass 20%,
Among the present invention, stone is selected cobble or rubble, preferred cobble, and the maximum particle diameter of stone is less than or equal to 15mm, and the silt content of stone is less than or equal to 10%.Cobble is little to equipment and pipeline abrasion, also causes line clogging because of elongated particles unlike rubble more.In order to reduce resilience, the maximum particle diameter of stone should not be greater than 15mm.
Among the present invention, water of the present invention requires identical with normal concrete, must not use sewage, pH value less than 4 sour water, containing sulfate by SO
4Meter surpasses water and weighs 1% water and seawater.
Among the present invention, the accelerating chemicals model is Red Star one type.Using the main purpose of accelerating chemicals is to make the sprayed concrete rapid hardening hard soon, improves early strength; Reduce rebound loss; Prevent coming off because action of gravity is caused of sprayed concrete; Improve the adaptive faculty that it uses in humidity or wet formation; And the pitch time that can suitably strengthen jet thickness of concrete and shortening jetted layers.According to present domestic materials supply and on-the-spot service condition, determine that by testing the accelerating chemicals model is Red Star one type, can be with 3% ~ 4% when its volume is 2% ~ 4%(spray arch of cement weight, can be with 2% ~ 3% when spraying abutment wall).
It is 0.6,0.9,1.2,1.5 kg/m that the below chooses polypropylene fiber
3Test, the concrete tensile splitting strength of the present invention, folding strength are described.
(1) splitting tensile test
1) test test specimen: the test specimen of tension test is made identical with compression tests, and making the concrete test block template size is 100 * 100 * 400mm, and maintenance is to prescribed condition after the form removal, and core boring sampling is tested used test specimen again.Tensile test piece is of a size of φ 50 * 25mm.
2) testing installation: this testing installation adopts WE-300 type universal hydraulic testing machine.
3) test-results:
The polypropylene fiber shotcrete Split-tension of Rolled Compressive Strength of normal concrete and different addition quantity is as shown in table 1:
Table 1 concrete splitting test for tensile strength result
Can find out that from the test-results of table 1 tensile splitting strength of normal concrete is 2.20MPa, polypropylene fiber is 600 g/m
3The tensile splitting strength of sprayed concrete be 2.35MPa, improve 7.0% than normal concrete; Polypropylene fiber is 900 g/m
3The tensile splitting strength of sprayed concrete be 2.64MPa, improve 20% than normal concrete; Polypropylene fiber is 1200 g/m
3The tensile splitting strength of sprayed concrete be 2.82MPa, improve 28% than normal concrete; Polypropylene fiber is 1500 g/m
3The tensile splitting strength of sprayed concrete be 2.90MPa, improve 32% than normal concrete.When polypropylene fiber is 900 g/m
3The time, sprayed concrete is larger than the tensile splitting strength increase rate of normal concrete, and polypropylene fiber is from 1200 g/m
3To 1500 g/m
3The time tensile strength increasing degree little.
The adding of polypropylene fibre so that sprayed concrete when tension, the fiber of distributed in three dimensions is brought into play its tension effect in the concrete, bears a part of tension load, causes the sprayed concrete tensile property to improve.But polypropylene fiber is not unlimited, only when suitable volume, just can play certain reinforced effects, during the polypropylene fiber value of reaching the limit of, fibers content in the concrete is excessive, so that sprayed concrete is difficult to stir, disperse inhomogeneous fiber to increase the defective at sprayed concrete interface, increase so that the intensity of sprayed concrete is difficult to continuation, even reduction is slightly arranged.
(2) bending test
1) test test specimen: making the concrete test block template size is 100mm * 100mm * 400mm, and maintenance is to prescribed condition after the form removal.
2) testing installation: this testing installation adopts WAW-600 type micro-control electro-hydraulic servo universal testing machine.
3) test-results:
The anti-crimping intensity of the fibrous concrete of normal concrete and different addition quantity is shown in table 2 and Fig. 1,2.
Table 2 concrete flexural strength test-results
Can find out that from the test-results of table 2 folding strength of normal concrete is 3.71MPa, fibers content is 600 g/m
3The folding strength of fibrous concrete be 3.75 MPa, improve 1.08% than normal concrete; Fibers content is 900 g/m
3The folding strength of fibrous concrete be 3.85 MPa, improve 3.77% than normal concrete; Fibers content is 1200 g/m
3The folding strength of fibrous concrete be 4.02 MPa, improve 8.36% than normal concrete; Fibers content is 1500 g/m
3The splitting folding strength of fibrous concrete be 4.05MPa, improve 9.16% than normal concrete.
Can find out that from Fig. 1, graphic representation above Fig. 2 after adding fiber, concrete load fall obviously reduces, displacement increases, show add polypropylene fibre after, the residual strength of fibrous concrete is obviously greater than normal concrete, fiber reinforcement concrete toughness.
Why high than normal concrete the fibrous concrete folding strength is, and its principle namely is that fiber plays the effect of involving to the concrete of fracture both sides when concrete fractures, and has delayed concrete cracking destruction, has strengthened concrete folding strength and tension ductility.
Claims (5)
1. sprayed concrete, it is characterized in that: component includes cement, sand, stone, water, accelerating chemicals, pencil monofilament polypropylene fibre, wherein the weight proportion of component cement, sand, stone, water is 1:1.84:1.84:0.45, the accelerating chemicals volume is 2% ~ 4% of cement weight, and polypropylene fiber is 0.9kg/m
3~ 1.5 kg/m
3
2. a kind of sprayed concrete according to claim 1, it is characterized in that: described cement preference label is not less than silicate cement or the ordinary Portland cement of P.O42.5.
3. a kind of sprayed concrete according to claim 1 is characterized in that: the preferred fineness modulus of described sand is greater than 2.5 coarse sand.
4. a kind of sprayed concrete according to claim 1 is characterized in that: described stone is selected cobble or rubble, preferred cobble, and the maximum particle diameter of stone is less than or equal to 15mm, and the silt content of stone is less than or equal to 10%.
5. a kind of sprayed concrete according to claim 1, it is characterized in that: described accelerating chemicals model is Red Star one type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102945398A CN103360005A (en) | 2013-07-12 | 2013-07-12 | Sprayed concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102945398A CN103360005A (en) | 2013-07-12 | 2013-07-12 | Sprayed concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103360005A true CN103360005A (en) | 2013-10-23 |
Family
ID=49362378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102945398A Pending CN103360005A (en) | 2013-07-12 | 2013-07-12 | Sprayed concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103360005A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446260A (en) * | 2014-12-02 | 2015-03-25 | 安徽恒源煤电股份有限公司 | Polypropylene fiber sprayed concrete |
| CN106116276A (en) * | 2016-06-16 | 2016-11-16 | 重庆大学 | A kind of gunite concrete that can observe tunnel surrounding rock displacement |
| CN108129095A (en) * | 2017-09-08 | 2018-06-08 | 泰州淘权网络科技有限公司 | A kind of gunite concrete |
| 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 |
| CN115163124A (en) * | 2022-07-19 | 2022-10-11 | 山东水总有限公司 | Mortar anchor rod net hanging and concrete spraying support process |
| CN115417639A (en) * | 2022-08-30 | 2022-12-02 | 中国建筑土木建设有限公司 | Tunnel shotcrete and tunnel concrete shotcrete construction method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007722A (en) * | 2006-01-24 | 2007-08-01 | 上海市建筑构件制品有限公司 | High compact bidirectionally adjustable concrete and its uses |
| CN101619656A (en) * | 2007-10-23 | 2010-01-06 | 中铁第一勘察设计院集团有限公司 | Permafrost tunnel supporting method of railway |
| CN102515652A (en) * | 2012-01-09 | 2012-06-27 | 山西潞安环保能源开发股份有限公司 | Formula of high-tenacity sprayed concrete |
| CN102718443A (en) * | 2012-06-11 | 2012-10-10 | 西南交通大学 | Ceramsite dual-doped shotcrete for high-temperature tunnel rock surfaces |
| CN102910869A (en) * | 2012-11-05 | 2013-02-06 | 沈阳建筑大学 | Superhigh toughness hollow modified polypropylene fiber sprayed concrete |
-
2013
- 2013-07-12 CN CN2013102945398A patent/CN103360005A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007722A (en) * | 2006-01-24 | 2007-08-01 | 上海市建筑构件制品有限公司 | High compact bidirectionally adjustable concrete and its uses |
| CN101619656A (en) * | 2007-10-23 | 2010-01-06 | 中铁第一勘察设计院集团有限公司 | Permafrost tunnel supporting method of railway |
| CN102515652A (en) * | 2012-01-09 | 2012-06-27 | 山西潞安环保能源开发股份有限公司 | Formula of high-tenacity sprayed concrete |
| CN102718443A (en) * | 2012-06-11 | 2012-10-10 | 西南交通大学 | Ceramsite dual-doped shotcrete for high-temperature tunnel rock surfaces |
| CN102910869A (en) * | 2012-11-05 | 2013-02-06 | 沈阳建筑大学 | Superhigh toughness hollow modified polypropylene fiber sprayed concrete |
Non-Patent Citations (3)
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|---|
| 吴科如，张雄: "《土木工程材料》", 31 August 2008, 同济大学出版社 * |
| 吴贤振，冯锐，刘祥鑫: "《井巷工程》", 31 May 2013, 北京：化学工业出版社 * |
| 桑普天等: "喷射聚丙烯纤维混凝土在矿业工程中的应用", 《混凝土与水泥制品》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446260A (en) * | 2014-12-02 | 2015-03-25 | 安徽恒源煤电股份有限公司 | Polypropylene fiber sprayed concrete |
| CN106116276A (en) * | 2016-06-16 | 2016-11-16 | 重庆大学 | A kind of gunite concrete that can observe tunnel surrounding rock displacement |
| CN108129095A (en) * | 2017-09-08 | 2018-06-08 | 泰州淘权网络科技有限公司 | A kind of gunite concrete |
| 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 |
| CN115163124A (en) * | 2022-07-19 | 2022-10-11 | 山东水总有限公司 | Mortar anchor rod net hanging and concrete spraying support process |
| CN115417639A (en) * | 2022-08-30 | 2022-12-02 | 中国建筑土木建设有限公司 | Tunnel shotcrete and tunnel concrete shotcrete construction method |
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Application publication date: 20131023 |