CN103420647A - Conductive material co-doping conductive concrete and preparation method thereof - Google Patents

Abstract

The invention provides conductive material co-doping conductive concrete and a preparation method thereof. The concrete is formed by cement, silica fume, carbon fiber, carbon nanomaterials (carbon nano tube, carbon black and graphite), nano-zinc oxide, water reducer, filler, dispersant, defoaming agents and water. The multifunctional conductive material co-doping conductive concrete is simple in preparation method, and excellent in performance. Part of carbon fiber is replaced with the carbon nanomaterials, and compared with the traditional conductive concrete, the conductive material co-doping conductive concrete has the advantages that the cost is low, the conductive property is stable, and nano-zinc oxide is mixed, so that the conductivity of the concrete can be greatly improved. Under the power on condition, the concrete has the excellent electrothermal performance, and is applied to an airfield pavement, a bridge floor and a cement concrete pavement, so that the effect of melting ice and snow can be realized, the bearing load of the road, the concrete structure crack and extension situations can be detected; under the power off condition, the concrete has the excellent electromagnetic performance, and can efficiently shield electromagnetic waves, reduce electromagnetic radiation, and reduce electromagnetic interference.

Description

A kind of conducting concrete of mixing again electro-conductive material and preparation method thereof

Technical field

The present invention relates to building material field, specifically a kind of conducting concrete of mixing again electro-conductive material and preparation method thereof.

Background technology

In China's cold district highway maintenance in winter winter accumulated snow problem icy on road processing be maximum puzzlement always.The Northwest, China northeast, early, the time length reaches some months to Winter Snow, and severe ice and snow weather is unimpeded and traffic safety is totally unfavorable to road, railway, highway and airport, brings inconvenience to people's life production.19 provinces, the snow and ice cover whole nation in 2008, caused the large-area paralysis of blocking up of traffic, loses huge.

At present the method for deicing or snow melting is mainly artificial, mechanical removal ice and snow and chemical process snow removing, but artificial snow removing is wasted time and energy, efficiency is low, expense is high, can not resume traffic in time, has obvious hysteresis quality; Use Snow Agent or deicer salts to bring disadvantageous effect to Infrastructure and surrounding environment, adopt physical method snow melt (hot snow melt method) progressively to cause scientific worker's attention.

Hot snow melt method has geothermal tube method, infrared heat lamp method, nichrome wire method, fluid heating method etc.The installation of geothermal tube method and construction water back have obvious complicacy; The infrared heat lamp method, easily be subject to ambient wind to impact, and heat up slowly, be unfavorable for fast snow melting.Because of the wagon flow motion, nichrome wire can be pulled out asphalt concrete pavement layer; The fluid heating method need to be set up a melting ice and snow system, but system construction trouble itself, device needs a large amount of fund inputs, hot-water system is difficult for arranging, more difficult control again, heats is undesirable, and when the malfunctioning and pvc pipe seepage of automatic control system, hot water control system must quit work; Corrosion can occur in the steel fiber in the steel fiber conductive concrete in concrete, and resistance can increase with the prolongation in the length of time.

Scientist manufactures conducting concrete since the experiment nineties in 20th century, adds micro-conductive steel fiber or carbon fiber in concrete, although proportion is less than 1%, can make concrete have conductive effect; If this conducting concrete of compacting, in concrete, electro-conductive fiber can be closely knit, improves concrete conductive effect, and the price of carbon fiber is higher, and the conducting concrete resistance rate of preparing is larger, does not utilize extensive use.

Summary of the invention

The invention provides a kind of conducting concrete of mixing again electro-conductive material and preparation method thereof, with carbon nanomaterial, substitute carbon fiber, added nano zine oxide, improved electric conductivity, reduced cost.

The component that the conducting concrete of mixing again electro-conductive material of the present invention comprises following parts by weight:

Cement, 20-40 part;

The silicon ash, 0-7 part;

Carbon fiber, 0.25-2 part;

Carbon nanomaterial, 0-2 part;

Nano zine oxide, 0.1-0.5 part;

Water reducer, 0.02-0.3 part;

Stopping composition, 50-150 part;

Dispersion agent, 1.5-3.7 part;

Defoamer, 0.1-0.3 part;

Water, 8-21 part.

Further improve, described Particle Size of Nanometer ZnO is 5-90nm.

Further improve, described carbon nanomaterial is carbon nanotube, carbon black and graphite, and its mass ratio is carbon nanotube: carbon black: graphite=1:6:3.

The present invention also provides a kind of its preparation method of mixing again the conducting concrete of electro-conductive material, comprises the following steps:

1) adopt the compound dispersion technology of physics and chemistry to be disperseed carbon fiber, carbon nanomaterial and nano zine oxide, standby;

2) by cement, silicon ash, stopping composition uniform stirring, add scattered carbon fiber, carbon nanomaterial, nano zine oxide and water reducer, dispersion agent and defoamer, again stir, be uniformly dispersed in concrete to guarantee carbon fiber, carbon nanomaterial and nano zine oxide;

3) deposit concrete, tentatively vibrate, floating;

4), according to the size of aggregate size in concrete, imbed for connecting the electrode of external circuit;

5) again vibrate, auxiliary compacting, guarantee that copper mesh is connected well with concrete.

Further improve, the described electrode of step 4) is copper wire gauze.

Beneficial effect of the present invention is:

(1) the present invention has added nano zine oxide in concrete, makes its resistivity well below normal concrete, and conductivity is good;

(2) preparation technology is simple and easy to do, with carbon nanomaterial, substitutes carbon fiber, has reduced cost.

(3) concrete that prepared by the present invention, in the situation that energising has good electric heating property, is applied to airstrip, bridge floor and cement concrete pavement, energy melting ice and snow, detection road load-bearing load, concrete structure crack and spread scenarios; There is good electromagnetic performance in cold situation, effectively shielding electromagnetic wave, minimizing electromagnetic radiation, reduction electromagnetic interference.

(4) can choose suitable electro-conductive material according to the requirement of use and execution conditions, control the resistivity of conducting concrete, conductivity is stable, electric heating property is controlled, controls the performance of its melting ice and snow.

Embodiment

Below in conjunction with specific embodiment, the present invention will be further described:

Embodiment 1:

(1) the shared parts by weight of each component are:

Cement, 20 parts;

The silicon ash, 0 part;

Carbon fiber, 0.25 part;

Carbon nanomaterial, 0 part;

Nano zine oxide, 0.1 part;

Water reducer, 0.02 part;

Stopping composition, 50 parts;

Dispersion agent, 1.5 parts;

Defoamer, 0.1 part;

Water, 8 parts.

(2) preparation process:

1) adopt the compound dispersion technology of physics and chemistry to be disperseed carbon fiber, carbon nanomaterial and nano zine oxide, standby;

2) by cement, stopping composition, carbon nanomaterial and nano zine oxide uniform stirring, add scattered carbon fiber, carbon nanomaterial and nano zine oxide, then add water reducer, dispersion agent and defoamer;

3) make electrode with copper mesh, insert in concrete, be used for connecting external circuit.

40 * 40 * 160mm conducting concrete test block prepared by said components and method, the resistivity in 20 ℃ ± 2 ℃, the above environment of relative humidity 95% after maintenance 7d, 28d and 60d is respectively 245.6 Ω cm, 248.3 Ω cm and 249.5 Ω cm.

Embodiment 2:

(1) the shared parts by weight of each component are:

Cement, 30 parts;

The silicon ash, 3.5 parts;

Carbon fiber, 0.5 part;

Carbon nanomaterial, 1.0 parts;

Nano zine oxide, 0.3 part;

Water reducer, 0.02 part;

Stopping composition, 100 parts;

Dispersion agent, 2.6 parts;

Defoamer, 0.2 part;

Water, 15 parts.

(2) preparation process:

1) adopt the compound dispersion technology of physics and chemistry to be disperseed carbon fiber, carbon nanomaterial and nano zine oxide, standby;

2) by cement, stopping composition, silicon ash and nano zine oxide uniform stirring, add scattered carbon fiber, carbon nanomaterial and nano zine oxide, then add water reducer, dispersion agent and defoamer;

3) make electrode with copper mesh, insert in concrete, be used for connecting external circuit.

40 * 40 * 160mm conducting concrete test block prepared by said components and method, the resistivity in 20 ℃ ± 2 ℃, the above environment of relative humidity 95% after maintenance 7d, 28d and 60d is respectively 135.3 Ω cm, 137.2 Ω cm and 138.8 Ω cm.

Embodiment 3:

(1) the shared parts by weight of each component are:

Cement, 40 parts;

The silicon ash, 7 parts;

Carbon fiber, 1.5 parts;

Carbon nanomaterial, 2 parts;

Nano zine oxide, 0.5 part;

Water reducer, 0.3 part;

Stopping composition, 150 parts;

Dispersion agent, 3.7 parts;

Defoamer, 0.3 part;

Water, 21 parts.

(2) preparation process

1) adopt the compound dispersion technology of physics and chemistry to be disperseed carbon fiber, carbon nanomaterial and nano zine oxide, standby;

2) by cement, stopping composition, silicon ash and nano zine oxide uniform stirring, add scattered carbon fiber, carbon nanomaterial and nano zine oxide, then add water reducer, dispersion agent and defoamer;

3) make electrode with copper mesh, insert in concrete, be used for connecting external circuit.

40 * 40 * 160mm conducting concrete test block prepared by said components and method, the resistivity in 20 ℃ ± 2 ℃, the above environment of relative humidity 95% after maintenance 7d, 28d and 60d is respectively 72.3 Ω cm, 74.5 Ω cm and 75.9 Ω cm.

The concrete application approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also be improved, these improvement also should be considered as protection scope of the present invention.

Claims (5)

1. a conducting concrete of mixing again electro-conductive material is characterized in that the component that comprises following parts by weight:

Cement, 20-40 part;

The silicon ash, 0-7 part;

Carbon fiber, 0.25-2 part;

Carbon nanomaterial, 0-2 part;

Nano zine oxide, 0.1-0.5 part;

Water reducer, 0.02-0.3 part;

Stopping composition, 50-150 part;

Dispersion agent, 1.5-3.7 part;

Defoamer, 0.1-0.3 part;

Water, 8-21 part.

2. a kind of conducting concrete of mixing again electro-conductive material according to claim 1, it is characterized in that: described Particle Size of Nanometer ZnO is 5-90nm.

3. a kind of conducting concrete of mixing again electro-conductive material according to claim 1, it is characterized in that: described carbon nanomaterial is carbon nanotube, carbon black and graphite, its mass ratio is carbon nanotube: carbon black: graphite=1:6:3.

4. a preparation method who mixes again the conducting concrete of electro-conductive material claimed in claim 1 is characterized in that comprising the following steps:

1) adopt the compound dispersion technology of physics and chemistry to be disperseed carbon fiber, carbon nanomaterial and nano zine oxide, standby;

2) by cement, silicon ash, stopping composition uniform stirring, add scattered carbon fiber, carbon nanomaterial, nano zine oxide and water reducer, dispersion agent and defoamer, again stir, be uniformly dispersed in concrete to guarantee carbon fiber, carbon nanomaterial and nano zine oxide;

3) deposit concrete, tentatively vibrate, floating;

4), according to the size of aggregate size in concrete, imbed for connecting the electrode of external circuit;

5) again vibrate, auxiliary compacting, guarantee that copper mesh is connected well with concrete.

5. the preparation method who mixes again the conducting concrete of electro-conductive material according to claim 3, it is characterized in that: the described electrode of step 4) is copper wire gauze.