CN100384769C - Method for preparing cement base graphite steel fiber composite conductive material - Google Patents
Method for preparing cement base graphite steel fiber composite conductive material Download PDFInfo
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- CN100384769C CN100384769C CNB2005102007576A CN200510200757A CN100384769C CN 100384769 C CN100384769 C CN 100384769C CN B2005102007576 A CNB2005102007576 A CN B2005102007576A CN 200510200757 A CN200510200757 A CN 200510200757A CN 100384769 C CN100384769 C CN 100384769C
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Abstract
The present invention relates to a cement-based graphite steel fiber compound conducting material preparing method, which belongs to the technical field of new materials. The present invention aims to provide bridge decks and road surfaces with a novel conducting heating cement-based compound material capable of melting snow and eliminating ice, and the novel compound material can also be used for structural damage self-monitoring on structural members. The present invention is characterized in that a mould is widespread with steel fiber, cement graphite mortar and a high efficiency water reducing agent are proportionally confected into high-flow slurry, and the high-flow slurry is injected into the mould and then conserved so as to form a novel conducting building material. The novel cement-based compound material of the present invention has the advantage of low resistivity, favorable mechanical property, favorable long-term stability of resistivity and no obvious changes of resistivity for more than two years. The novel cement-based compound material also has the advantages of simple production process, low cost, and is widely used for melting snow and eliminating ice on bridge decks and road surfaces in winter, for heating for indoor floors, and in projects such as structural damage self-monitoring, etc. The present invention can produce great economical and social benefits.
Description
Technical field
The invention belongs to new material technology field, relate to the method for using graphite and high volume steel fiber to make a kind of high strength low-resistivity New Building Materials as conductive phase.
Background technology
In recent years, along with the development of building, urgent day by day to the multifunctionality and the intelligentized requirement of common building material towards intelligent direction.Building bridge floor material, ground surface material have the snow melt deicing of switching on winter of stable low-resistivity; With high strength low resistivity material manufacturing structure member, come the monitoring structure degree of impairment by the subtle change of monitored resistance rate, these all are importances of building intelligent.Want to realize this purpose, must be by using the material of construction of reliable and stable high strength low-resistivity.Cement-base composite material mainly contains following three kinds of methods to its method of modifying that carries out the electroconductibility aspect both at home and abroad at present as the most large material of construction, realizes the material conductivity with graphite as conductive phase that is:; With low-dosage steel fiber and steel cuttings is that conductive phase is realized the material conductivity; With the carbon fiber is that conductive phase is realized the material conductivity.These three kinds of methods all can make the resistivity of matrix material be reduced to below the 10 Ω .m, generally can satisfy the requirement of conductivity, but also all there is certain shortcoming: realize the material conductivity as conductive phase with graphite, this method is owing to graphite mixes, the intensity of material obviously descends, and general when the graphite volume reaches 10% left and right sides of cement weight, the ultimate compression strength loss can reach more than 90%, intensity is reduced to below the 10MPa, can not satisfy the structure stress requirement.With low-dosage steel fiber and steel cuttings is that conductive phase is realized the material conductivity, and this method is with traditional stirring technique forming composite, is subjected to the restriction volume content of steel fibers of stirring technique to be difficult to surpass 1%.Its maximum shortcoming is the poor stability of material conductivity (resistivity), general after 1 year because the corrosion and the oxidation passivation of steel fiber and steel cuttings, its resistivity increases and can reach initial value and get more than 100 times, has lost conductivity basically and can not continue to use.With the carbon fiber is that conductive phase is realized the material conductivity, and this method makes that the application of this method is very uneconomical, thereby influenced its large-scale use owing to carbon fiber costs an arm and a leg.
Summary of the invention
The objective of the invention is to for bridge floor, road surface provide a kind of excellent mechanical performances but also can conductive exothermal of not only having had, solve the New Building Materials that bridge in winter, pavement snow melting remove ice problem; This material also can be used in the building structure, realizes structural impairment is carried out self-monitoring purpose by the subtle change to structure stress process resistivity of material.
Ultimate principle of the present invention is: high volume fraction steel fiber and graphite particle be the common conductive network that forms in matrices of composite material, because the acting in conjunction of two kinds of conductive networks, and graphite ionic conduction network good long term stability, therefore very low and ultimate compression strength of the resistivity of this advanced composite material and bending strength are improved largely, and have avoided other method in the reduction of pursuing resistivity and the shortcoming of heavy losses intensity.
Technical scheme of the present invention is with steel fiber and the graphite conductive phase as matrix material, adopts high workability cement graphite mortar slip-casting shaping process, and this technology can make steel fiber volume ratio up to more than 15%, and the graphite volume is more than 10% of cement weight.The steel fiber of high volume and graphite is the common conductive network that forms in material matrix, and resistivity of material is between 5-8 Ω .m, and ultimate compression strength can reach more than the 80MPa, and folding strength can reach more than the 30MPa;
Effect of the present invention and benefit are, this cement-base composite material, have lower resistivity and excellent mechanical property (ultimate compression strength in the above bending strength of 80MPa more than 30MPa) and good resistivity permanent stability, resistivity does not have considerable change more than 2 years.This material produce is simple, and is cheap, is widely used in snow melt in the winter deicing of bridge floor road surface, flooring heating, and structural impairment can produce huge economic benefit and social benefit in engineerings such as monitoring.
Embodiment
Be described in detail specific embodiments of the invention below in conjunction with technical scheme.
Embodiment one:
Step 1. is with length 30-40mm, and the even spreading of straight shape steel fiber of length-to-diameter ratio 50-60 is in the mould of definite shape, and steel fiber volume ratio is in the 16%-18% scope.
Step 2. cement-graphite-silicon lime and brick is made
Cement adopts the 42.5MPa silicate cement, and graphite adopts powder graphite, fineness 200-250 order, and carbon content 96-98%, sulphur content is less than 0.05%, and water ratio is less than 1%.Sand adopts fine sand, particle diameter 125-150 μ m.Cement mortar rate (cement+graphite+silicon ash gets weight ratio with sand) is 1: 1.25, and the weight ratio of cement and silicon ash is 10: 1, and cement and graphite weight ratio are 10: 1.The high efficiency water reducing agent volume is 1% of cement+graphite+silicon ash weight sum.Water-cement ratio (mixing water and cement+graphite+silicon ash weight ratio) is 0.38.Pour cement graphite in mortar mixer stirring 30-60 second, sand is poured into stirred in the stirrer 30-60 second then, high efficiency water reducing agent is dissolved in to pour into slowly in the mixing water in the stirrer stirred 60 seconds.
Step 3. is with step 2 finish mix slurry implantation step 1 evenly in the mould of spreading steel fiber, for making slip equably in the landfill steel fiber layer, mould vibrated through appropriateness.As what make is member, can place 20 ± 2 ℃ of temperature, and relative humidity was greater than maintenance in 90% the curing room 28 days, and form removal gets final product.If field fabrication is carried out getting final product maintenance to certain length of time in the surface coverage layer of plastic film behind the injection forming.
Embodiment two:
Step 1. is with length 30-35mm, and the even spreading of the shaped steel fibres of length-to-diameter ratio 40-50 is in the mould of definite shape, and steel fiber volume ratio is in the 15%-16% scope.
Step 2 is the same with step 3.
Claims (1)
1. method for preparing cement base graphite steel fiber composite conductive material, be spreading length 30mm-40mm in mould, length-to-diameter ratio is the straight shape steel fiber of 50-60, the volume volume 16%-18% of steel fiber, the slip that cement graphite mortar and high efficiency water reducing agent are mixed with injects mould again, a kind of conducing composite material that forms through maintenance; It is characterized in that utilizing graphite and steel fiber as conductive phase, adopt fineness 200 orders-250 order, the powder graphite of carbon content 96%-98%, sand adopts fine sand, particle diameter 125 μ m-150 μ m; Cement mortar rate is that cement+graphite+silicon ash is 1: 1.25 with the weight ratio of sand, the weight ratio of cement and silicon ash is 10: 1, cement and graphite weight ratio are 10: 1, the high efficiency water reducing agent volume is 1% of cement+graphite+silicon ash weight sum, water-cement ratio is that mixing water and cement+graphite+silicon ash weight ratio are 0.38, make slip through stirring, adopt slip casting technology, the preparation cement base graphite steel fiber composite conductive material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102007576A CN100384769C (en) | 2005-12-02 | 2005-12-02 | Method for preparing cement base graphite steel fiber composite conductive material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102007576A CN100384769C (en) | 2005-12-02 | 2005-12-02 | Method for preparing cement base graphite steel fiber composite conductive material |
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| Publication Number | Publication Date |
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| CN1821152A CN1821152A (en) | 2006-08-23 |
| CN100384769C true CN100384769C (en) | 2008-04-30 |
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| CNB2005102007576A Expired - Fee Related CN100384769C (en) | 2005-12-02 | 2005-12-02 | Method for preparing cement base graphite steel fiber composite conductive material |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103664095B (en) * | 2013-11-14 | 2015-12-30 | 重庆大学 | A kind of conducting concrete and preparation method thereof |
| CN104609785B (en) * | 2015-01-08 | 2017-01-04 | 深圳建业工程集团股份有限公司 | A kind of conductive fiber mortar and the wall roofing construction method of a kind of prevention and control thunder and lightning infringement |
| CN108863277A (en) * | 2018-07-23 | 2018-11-23 | 广州大学 | A kind of recycled aggregate alkali-activated carbonatite conducting concrete and preparation method thereof |
| CN111393098A (en) * | 2020-03-16 | 2020-07-10 | 广东盖特奇新材料科技有限公司 | Conductive heating high-strength cement-based composite fiber material and preparation method thereof |
Citations (4)
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| CN1092048A (en) * | 1993-03-06 | 1994-09-14 | 鞍山钢铁公司 | Anti-corrosion slag concrete |
| CN1092751A (en) * | 1990-03-23 | 1994-09-28 | 冯泰克国际有限公司 | Interground fiber cement |
| WO2002040799A1 (en) * | 2000-11-14 | 2002-05-23 | Mantle & Llay Limited | An electromagnetic radiation shielding material |
| CN1453237A (en) * | 2003-05-28 | 2003-11-05 | 武汉理工大学 | Black light concrete for paving layer of bridge |
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2005
- 2005-12-02 CN CNB2005102007576A patent/CN100384769C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1092751A (en) * | 1990-03-23 | 1994-09-28 | 冯泰克国际有限公司 | Interground fiber cement |
| CN1092048A (en) * | 1993-03-06 | 1994-09-14 | 鞍山钢铁公司 | Anti-corrosion slag concrete |
| WO2002040799A1 (en) * | 2000-11-14 | 2002-05-23 | Mantle & Llay Limited | An electromagnetic radiation shielding material |
| CN1453237A (en) * | 2003-05-28 | 2003-11-05 | 武汉理工大学 | Black light concrete for paving layer of bridge |
Non-Patent Citations (6)
| Title |
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| 石墨导电混凝土的研究. 沈刚.混凝土，第2 期(总第172 期)期. 2004 |
| 石墨导电混凝土的研究. 沈刚.混凝土，第2 期(总第172 期)期. 2004 * |
| 碳/钢混杂纤维水泥基复合材料的性能研究. 王桂明.武汉理工大学学报，第26卷第6期. 2004 |
| 碳/钢混杂纤维水泥基复合材料的性能研究. 王桂明.武汉理工大学学报，第26卷第6期. 2004 * |
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| CN1821152A (en) | 2006-08-23 |
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