CN105236850A - Electric-conductive reactive powder concrete, preparation method and application thereof - Google Patents
Electric-conductive reactive powder concrete, preparation method and application thereof Download PDFInfo
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- CN105236850A CN105236850A CN201510543355.XA CN201510543355A CN105236850A CN 105236850 A CN105236850 A CN 105236850A CN 201510543355 A CN201510543355 A CN 201510543355A CN 105236850 A CN105236850 A CN 105236850A
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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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Abstract
The invention discloses electric-conductive reactive powder concrete with composition of short-cut ultrathin stainless steel micro wires, and a preparation method and an application thereof. The reactive powder concrete includes following components: cement, fly ash, silica fume, quartz sand, the short-cut ultrathin stainless steel micro wires, water and a water reducing agent according to the weight ratio of 1:(0.25-0.35):(0.25-0.35):(1.0-1.5):(0.09-0.14):(0.30-0.40):(0.005-0.035), wherein the short-cut ultrathin stainless steel micro wires are 18-30 [mu]m in diameter and 6-12 mm in length. The concrete is prepared through a regular stirring and maintaining process. The reactive powder concrete is greatly reduced in resistivity under a low addition amount of the stainless steel micro wires and meanwhile has a self-sensing performance. The reactive powder concrete is simple in production process and production cost, can solve a problem that steel fibers are liable to be exposed in a thin-plate member, and is especially suitable in the following fields, such as snow and ice melting, electromagnetic shield or electromagnetic absorption and other special structures.
Description
Technical field
The present invention relates to a kind of electrical conductive activities powder concrete and its preparation method and application, belong to multi-functional, intelligent concrete field of material preparation.
Background technology
In the existing RPC generally used, steel fiber diameter range is 0.15-0.25mm, quartz sand particle size scope is 25 ~ 100 orders, and use silica powder more, water cement ratio is 0.16 ~ 0.25, the shortcoming of this type of RPC is: 1) under low-dosage steel fiber, number of fiber is limited, cannot form complete conductive network, poor electric conductivity; 2) when volume content of steel fibers is higher, workability is poor, limits its use range, and the thin-plate elements such as road surface prepared therefrom, bridge floor be easy to produce steel fiber expose and corrosion problem; 3) adopt silica powder to do ultra-fine filling material, and adopt lower water cement ratio and high temperature or steaming pressuring curing process, increase preparation cost and energy consumption.For improving the electroconductibility of RPC, adopt carbon fiber in existing research more, or be the steel fiber compound use of 0.15-0.25mm by carbon fiber and above-mentioned diameter, the defect of this kind of RPC except above-mentioned points, also be: 1) compatibility performance of carbon fiber and cement-based material is poor, specific dispersion technology need be adopted or add dispersion agent, adding cost of manufacture; 2) carbon fiber fragility is large, easily ruptures, and then its inner conductive network is destroyed under shear stress, reduces its perception to distortion and fragmentation.
Summary of the invention
For solving the problem, the object of the present invention is to provide a kind of short electrical conductive activities powder concrete cutting special thin fine stainless steel wire compound, it can conduct electricity and perception load and distortion under low-dosage fine stainless steel wire, can be used for electric heating conversion and deicing or snow melting, there is electromagnetic shielding or absorptive function simultaneously, also can be used for solving exposing and corrosion problem of thin-plate element steel fiber, expand the Application Areas of existing RPC.
Technical solution:
The short electrical conductive activities powder concrete cutting special thin fine stainless steel wire compound, comprises cement: flyash by weight: silicon ash: quartz sand: shortly cut special thin fine stainless steel wire: water: water reducer=1:0.25 ~ 0.35:0.25 ~ 0.35:1.0 ~ 1.5:0.09 ~ 0.14:0.30 ~ 0.40:0.005 ~ 0.035; The described short diameter cutting special thin fine stainless steel wire is 18 ~ 30 μm, and length is 6 ~ 12mm, unit elongation > 1%, and tensile strength is 1200 ~ 1800MPa.
Further, in technique scheme, the particle diameter of described quartz sand is 20 ~ 120 orders; The SiO of quartz sand
2content>=99-99.5%, Fe
2o
3content≤0.005%.
Further, in technique scheme, the particle diameter of described quartz sand adopts the quartz sand of different meshes scope to be mixed with and forms, 20 ~ 40 orders: 40 ~ 70 orders: 70 ~ 120 order=0.8 ~ 1.2:0.8 ~ 1.2:0.8 ~ 1.2.
Further, in technique scheme, described cement mark is PO42.5R, and flyash is II grade of ash, and the specific surface area of described silicon ash is 16000 ~ 20000m
2/ kg.
The invention provides a kind of above-mentioned short preparation method cutting the electrical conductive activities powder concrete of special thin fine stainless steel wire compound, stirring flow process is for first mixing cement, flyash, silicon ash, short spy thin fine stainless steel wire, water and the part water reducer cut, in cement mortar mixer, stirring at low speed is after 1 ~ 3 minute, high-speed stirring 3 ~ 5 minutes, suspend and add quartz sand while 1 minute, stirring at low speed 1 ~ 2 minute, after adding remaining water reducer, then high-speed stirring 4 ~ 6 minutes.
Further, in technique scheme, conservation system is that maintenance to 7 ~ 14 day are placed on maintenance to 28 in air ~ 56 day in 20 ± 1 DEG C of water.
The invention provides above-mentioned concrete in the application of component in perception.
The invention provides the application of above-mentioned concrete in road bridge beam slab.
The invention provides the application of above-mentioned concrete in electromagnetic shielding or baffle.
The present invention adopts short electroconductibility of cutting special thin fine stainless steel wire raising RPC, its resistivity does not use and shortly can reduce by four orders of magnitude when cutting special thin fine stainless steel wire, and its ga(u)ge factor under prism resistance to compression load does not use and shortly improves 5.9 times when cutting special thin fine stainless steel wire.The use of low-dosage fine stainless steel wire can form complete conductive network in RPC inside, can improve its intensity and toughness simultaneously; By selecting the quartz sand of reasonable grain composition, adopting coal ash instead part of cement and relatively high water cement ratio, while guarantee RPC performance, reduce its cost of manufacture.Short Main Function mechanism of cutting special thin fine stainless steel wire composite conducting RPC has three aspects: 1. short to cut special thin fine stainless steel wire good with the adaptability of RPC matrix, is easy to disperse; 2. short length-to-diameter ratio of cutting special thin fine stainless steel wire is large, and the effective microfilament radical under low-dosage is many; 3. coarse aggregate is eliminated in RPC, and the short special thin diameter of fine stainless steel wire, the particle diameter of quartz sand and the short diameter cutting special thin fine stainless steel wire cut presents ever-increasing order of magnitude relation, grating is good, this makes to be easy to overlap joint between fine stainless steel wire, namely form the conductive network be communicated with at low-dosage, occur conductance percolation phenomenon.
Invention beneficial effect
At present, the electroconductibility also not having document to cut special thin fine stainless steel wire composite conducting RPC to short and perceptual performance are studied.Short cut special thin fine stainless steel wire and RPC adaptability good, length-to-diameter ratio is high, and the fine aggregate diameter of its diameter, length and RPC is arranged in pairs or groups well, conductive network can be overlapped to form under low-dosage, there is good electroconductibility, can be used in the special construction such as deicing or snow melting, electromagnetic shielding/absorption; The use of fine stainless steel wire simultaneously can improve intensity and the toughness of RPC, can solve thin plate-like member steel fiber and be easy to expose the defect with corrosion; The reduction of single cement consumption and the lower requirement to care environments, make the reduction of the preparation of this matrix material to the recycling of flyash and high-performance multifunctional concrete material cost of manufacture significant.
Accompanying drawing explanation
Accompanying drawing 4 width of the present invention,
Fig. 1 is the ga(u)ge factor schematic diagram under two-probe method measures concrete resistivity and anti-folding failing load;
Fig. 2 is that four electrode method measures concrete resistivity and circulation and the ga(u)ge factor schematic diagram under destruction resistance to compression load;
Fig. 3 (a) is concrete ac impedance characteristic figure prepared by comparative example 1; B () is concrete ac impedance characteristic figure prepared by embodiment 1;
Fig. 4 (a) is concrete equivalent-circuit diagram prepared by comparative example 1; B () is concrete equivalent-circuit diagram prepared by embodiment 1.
Embodiment
Following nonlimiting examples can make the present invention of those of ordinary skill in the art's comprehend, but does not limit the present invention in any way.
Short cut special thin fine stainless steel wire composite conducting RPC direct current resistance and alternating current resistance adopt frequency to be that the handheld-type intelligent LCR survey meter of 100KHZ and Keithley 2100 digital multimeter are measured respectively, acquired results carries out can be calculated electricalresistivityρ according to formula ρ=RS/L, wherein R-resistance; S-test specimen area; Distance between L-two electrode.The test block size adopted and pole layout mode are as depicted in figs. 1 and 2.For obtaining the ga(u)ge factor under different load situation, foil gauge is pasted in position shown in the figure.
The present embodiment is short-and-medium cuts special thin fine stainless steel wire purchased from Long Zhi Trade Co., Ltd. of Laiwu in Shandong province, this product adopts the new day 316L type stainless steel drawing of Japan to form, diameter is 18 ~ 30 μm, length is 6 ~ 12mm, unit elongation > 1%, tensile strength is 1200 ~ 1800MPa.
Water reducer described in the present embodiment is the high early-strength high-performance water reducer RHEOPLUS411 series that BASF chemical building material (China) company limited produces.
Embodiment 1
The present invention cuts special thin fine stainless steel wire for the preparation of electrical conductive activities powder concrete by short for one, its cost is low, good conductivity, applied range, be particularly useful for load and distortion from the deicing or snow melting of perception, road bridge beam slab, the electromagnetic shielding/absorption etc. of important military structure.
Weight ratio in the present embodiment between each component of concrete is: cement: flyash: silicon ash: quartz sand: shortly cut special thin fine stainless steel wire: water: water reducer=1:0.25:0.30:1.4:0.12:0.38:0.0085, wherein cement 654kg/m
3.Use in the present invention short to cut special thin fine stainless steel wire diameter be 18 ~ 30 μm, length is 10mm.
The first step: first cement, flyash, silicon ash, short spy thin fine stainless steel wire, water and the part water reducer cut are mixed, stirring at low speed is after 2 minutes in cement mortar mixer, high-speed stirring 3 minutes; Second step: suspend and add quartz sand while 1 minute, stirring at low speed 1 minute; 3rd step: add remaining water reducer, high-speed stirring 4 minutes, obtains and shortly cuts special thin fine stainless steel wire reinforced reactive-powder-concrete slurry.
Shortly cut special thin fine stainless steel wire denatured conductive RPC test specimen maintenance form removal after 24 hours in standard curing box, in 20 ± 1 DEG C of water, maintenance to 14 day to be placed in air maintenance 28 days.
Comparative example 1
Difference from Example 1 is not cut special thin fine stainless steel wire containing short in component.
Comparative example 2
Weight ratio in this comparative example between each component of RPC is: cement: flyash: silicon ash: silica powder: quartz sand: steel fiber: water: water reducer=1:0.11:0.28:0.33:1.22:0.43:0.26:0.028.
In this comparative example, cement mark is PO42.5; Quartz sand is mixed with the ratio of 1:1 by 40 ~ 70 orders and 70 ~ 140 order quartz sands; The size distribution of silica powder is 5 ~ 30 μm; Flyash is I level ash; Silicon ash specific surface area is 15000m
2/ kg; Steel fiber mean length is 15mm, and diameter is 0.2mm.
Cement mortar mixer is adopted to stir slurry, Non-follow control churning time in this comparative example.First pour the powder such as cement, flyash and admixture in agitator kettle dry mixing 30s, then add the water of 80%, after adding water, slowly add steel fiber while stirring, stir 3 ~ 5min, finally add the water of remaining 20%, stir 3 ~ 5min.
Move into after specimen molding in this comparative example in curing room, form removal after 24h, in 60 DEG C of steam after maintenance 3d, adopt four electrode DC method test resistance rates, sample dimensions used is 3mm × 4mm × 5mm.
Performance test
Shortly cut the impact of special thin fine stainless steel wire on the ga(u)ge factor under RPC resistivity, different load and ac impedance characteristic as shown in table 1, table 2, Fig. 3 and Fig. 4.
Table 1 is short cuts special thin fine stainless steel wire to the impact (Ω cm) of RPC resistivity
As shown in Table 1, the short electrical conductive activities powder concrete cutting special thin fine stainless steel wire compound, under low-dosage fine stainless steel wire, make concrete resistivity reduce four orders of magnitude, and its resistivity value is far below the concrete resistivity of comparative example 1.
Table 2 is short cuts the impact of superfine stainless steel microfilament on ga(u)ge factor under the different load of RPC
As shown in Table 2, the short electrical conductive activities powder concrete cutting special thin fine stainless steel wire compound under load from perception higher than comparative example 1 concrete and metal strain plate.
As shown in Figure 3, the short alternating-current impedance spectrogram cutting the electrical conductive activities powder concrete of special thin fine stainless steel wire compound has been no longer the Randles figure of typical cement-based material, and during energising, its internal conductive paths is no longer fixed against pore solution.
As shown in Figure 4, the short conductive path cutting special thin fine stainless steel wire denatured conductive RPC inside is controlled by the short thin fine stainless steel wire of spy of cutting mutually overlapped.
Claims (9)
1. an electrical conductive activities powder concrete, is characterized in that: comprise cement by weight: flyash: silicon ash: quartz sand: shortly cut special thin fine stainless steel wire: water: water reducer=1:0.25 ~ 0.35:0.25 ~ 0.35:1.0 ~ 1.5:0.09 ~ 0.14:0.30 ~ 0.40:0.005 ~ 0.035; The described short diameter cutting special thin fine stainless steel wire is 18 ~ 30 μm, and length is 6 ~ 12mm, unit elongation > 1%, and tensile strength is 1200 ~ 1800MPa.
2. electrical conductive activities powder concrete according to claim 1, is characterized in that: the particle diameter of described quartz sand is 20 ~ 120 orders; The SiO of quartz sand
2content>=99-99.5%, Fe
2o
3content≤0.005%.
3. electrical conductive activities powder concrete according to claim 1, it is characterized in that: described quartz sand adopts the quartz sand of different meshes scope to be mixed with and forms, 20 ~ 40 orders: 40 ~ 70 orders: 70 ~ 120 order=0.8 ~ 1.2:0.8 ~ 1.2:0.8 ~ 1.2.
4. electrical conductive activities powder concrete according to claim 1, is characterized in that: described cement mark is PO42.5R, and flyash is II grade of ash, and the specific surface area of described silicon ash is 16000 ~ 20000m
2/ kg.
5. the preparation method of electrical conductive activities powder concrete as claimed in claim 1, it is characterized in that: stirring flow process is for first mixing cement, flyash, silicon ash, short spy thin fine stainless steel wire, water and the part water reducer cut, in cement mortar mixer, stirring at low speed is after 1 ~ 3 minute, high-speed stirring 3 ~ 5 minutes, suspend and add quartz sand while 1 minute, stirring at low speed 1 ~ 2 minute, after adding remaining water reducer, then high-speed stirring 4 ~ 6 minutes.
6. the preparation method of electrical conductive activities powder concrete according to claim 5, is characterized in that: conservation system is that maintenance to 7 ~ 14 day are placed on maintenance to 28 in air ~ 56 day in 20 ± 1 DEG C of water.
7. the concrete that the concrete as described in claim 1-4 and the preparation method as described in claim 5,6 obtain is in the application of component in perception.
8. the application of concrete in road bridge beam slab that the concrete as described in claim 1-4 and the preparation method as described in claim 5,6 obtain.
9. the application of concrete in electromagnetic shielding or baffle that concrete and the preparation method as described in claim 5,6 obtain as described in claim 1-4.
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Cited By (8)
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| CN105819773A (en) * | 2016-03-09 | 2016-08-03 | 河海大学 | Short stainless steel band concrete and preparation method thereof |
| CN106186905A (en) * | 2016-06-30 | 2016-12-07 | 大连理工大学 | A kind of cement-base composite material mixing bag silicon nano titanium oxide and preparation method thereof |
| CN106673532A (en) * | 2017-01-20 | 2017-05-17 | 河海大学 | Self-sensing nickel nanofiber cement-based composite material |
| CN108341630A (en) * | 2018-04-17 | 2018-07-31 | 大连理工大学 | A kind of Reactive Powder Concrete and preparation method of high abrasion and chloride-penetration resistance |
| CN110407537A (en) * | 2019-07-31 | 2019-11-05 | 大连理工大学 | A kind of graphene reinforced reactive-powder-concrete of impact resistance |
| CN111792896A (en) * | 2020-07-15 | 2020-10-20 | 大连理工大学 | Self-sensing high-strength mortar and preparation method and application thereof |
| CN112697584A (en) * | 2020-12-07 | 2021-04-23 | 北京建筑大学 | Stress self-sensing cement-based material tension sensitivity performance testing method |
| CN113816697A (en) * | 2021-10-28 | 2021-12-21 | 国网河南省电力公司直流运检分公司 | High-conductivity composite grounding material and preparation method thereof |
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Cited By (11)
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| CN105819773A (en) * | 2016-03-09 | 2016-08-03 | 河海大学 | Short stainless steel band concrete and preparation method thereof |
| CN106186905A (en) * | 2016-06-30 | 2016-12-07 | 大连理工大学 | A kind of cement-base composite material mixing bag silicon nano titanium oxide and preparation method thereof |
| CN106186905B (en) * | 2016-06-30 | 2018-07-13 | 大连理工大学 | A kind of cement-base composite material and preparation method thereof for mixing packet silicon nano-titanium dioxide |
| CN106673532A (en) * | 2017-01-20 | 2017-05-17 | 河海大学 | Self-sensing nickel nanofiber cement-based composite material |
| CN106673532B (en) * | 2017-01-20 | 2019-02-12 | 河海大学 | A kind of perception nickel nanofiber cement-base composite material certainly |
| CN108341630A (en) * | 2018-04-17 | 2018-07-31 | 大连理工大学 | A kind of Reactive Powder Concrete and preparation method of high abrasion and chloride-penetration resistance |
| CN110407537A (en) * | 2019-07-31 | 2019-11-05 | 大连理工大学 | A kind of graphene reinforced reactive-powder-concrete of impact resistance |
| CN111792896A (en) * | 2020-07-15 | 2020-10-20 | 大连理工大学 | Self-sensing high-strength mortar and preparation method and application thereof |
| CN111792896B (en) * | 2020-07-15 | 2022-01-11 | 大连理工大学 | Self-sensing high-strength mortar and preparation method and application thereof |
| CN112697584A (en) * | 2020-12-07 | 2021-04-23 | 北京建筑大学 | Stress self-sensing cement-based material tension sensitivity performance testing method |
| CN113816697A (en) * | 2021-10-28 | 2021-12-21 | 国网河南省电力公司直流运检分公司 | High-conductivity composite grounding material and preparation method thereof |
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