CN113060989A - Method for enhancing concrete resistance and electromagnetic shielding performance by using carbon nanofibers - Google Patents
Method for enhancing concrete resistance and electromagnetic shielding performance by using carbon nanofibers Download PDFInfo
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- CN113060989A CN113060989A CN202110321145.1A CN202110321145A CN113060989A CN 113060989 A CN113060989 A CN 113060989A CN 202110321145 A CN202110321145 A CN 202110321145A CN 113060989 A CN113060989 A CN 113060989A
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- 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
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- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/386—Carbon
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- 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
- C04B2111/00008—Obtaining or using nanotechnology related materials
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- 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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00258—Electromagnetic wave absorbing or shielding materials
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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a method for enhancing the resistance and electromagnetic shielding performance of concrete by using carbon nanofibers, which belongs to the technical field of building material processing and comprises the following steps: (1) weighing raw materials; (2) preparing a carbon nanofiber dispersion liquid; (3) preparing a nano carbon fiber reinforced concrete mixture; (4) and (3) preparing the carbon nanofiber reinforced concrete. The concrete prepared by the method meets the structural resistance and has effective electromagnetic shielding efficiency, realizes the multifunctionalization of materials, and has important military value and significance.
Description
Technical Field
The invention belongs to the technical field of building material processing, and particularly relates to a method for enhancing the resistance and electromagnetic shielding performance of concrete by using carbon nanofibers.
Background
With the continuous development of high-performance, high-precision and high-damage weapons, military facilities and defense projects face the influence of adverse factors such as stronger external stress, more powerful weapon penetration, stronger explosion impact damage and the like. Meanwhile, with the rapid development of electronic technology, especially the continuous innovation of electromagnetic technology, the form of modern war has also been changed, and the traditional weapon strike is gradually transferred to the damage and interference to command communication system, electronic equipment, information weapon, etc., and various new radars, advanced detectors, even electromagnetic wave weapons come out one after another, and put forward new and higher requirements on electromagnetic shielding technology of military facilities and national defense engineering.
At present, concrete is still the main material for building military facilities and national defense projects, and the improvement of the anti-strike and anti-electromagnetic interference capabilities of the military facilities and the national defense projects is the improvement of the strength and the electromagnetic shielding effectiveness of the concrete material. The research, development and selection of novel concrete materials are important for improving the shock resistance and electromagnetic shielding effectiveness of military facilities and national defense projects.
With the continuous progress of modern material science, particularly the penetration of nanotechnology in various subject fields, the development of traditional concrete towards high strength, high performance, multiple functions and intellectualization becomes possible. Carbon Nanofibers (CNFs) are a form of chemical vapor growth Carbon fibers, are discontinuous nano-scale graphite fibers prepared by cracking vapor-phase hydrocarbons, have the inherent properties of Carbon fibers, have the small size and active effect of nano materials, and are multifunctional materials with excellent performance. Meanwhile, the specific surface area of the CNFs is 3-4 orders of magnitude larger than that of conventional coarse powder, and the absorption rate of the CNFs to infrared light and electromagnetic waves is much larger than that of conventional materials, so that the CNFs can absorb and consume a large amount of external electromagnetic waves, and show good electromagnetic shielding effectiveness.
Therefore, the nano carbon fiber reinforced concrete can be used as an electromagnetic shielding layer material and a structural material to be applied to military facilities and national defense engineering, meets the requirement of high resistance of the structure, has effective electromagnetic shielding efficiency, realizes the multifunction of the material, and has important military value and significance.
Disclosure of Invention
The invention aims to provide a method for enhancing the resistance and the electromagnetic shielding performance of concrete by using carbon nanofibers, aiming at the existing problems.
The invention is realized by the following technical scheme:
a method for enhancing the resistance and the electromagnetic shielding performance of concrete by using carbon nanofibers comprises the following steps:
(1) weighing raw materials:
weighing 495kg/m of cement with corresponding formula weight31008kg/m of crushed stone3672kg/m of sand3180kg/m of water30 to 0.9kg/m of defoaming agent30 to 15kg/m of water reducing agent30 to 0.9kg/m of carbon nanofibers3Standby;
(2) preparing a carbon nanofiber dispersion liquid:
A. pouring the water reducing agent weighed in the step (1) into the water weighed in the step (1), and stirring for 60s at 120r/min by using an electric stirrer;
B. pouring the carbon nanofibers weighed in the step (1) and half of the defoaming agent into a stirrer in the operation A, stirring for 150s at 300r/min, then adding the remaining half of the defoaming agent, and manually stirring for 5min until no obvious bubbles exist in the carbon nanofiber dispersion liquid;
(3) preparing a nano carbon fiber reinforced concrete mixture:
A. adding the sand and the crushed stone weighed in the step (1) into a forced stirrer, stirring for 60s, adding the cement weighed in the step (1), and stirring for 60 s;
B. adding the nano carbon fiber dispersion liquid prepared in the step (2) into a forced stirrer in the operation A while stirring, and stirring for 120s after the addition is finished;
(4) preparing the nano carbon fiber reinforced concrete:
pouring out the mixture of the nano carbon fiber reinforced concrete prepared in the step (3), manually turning and stirring for 60s, pouring, placing the mixture in a room, standing for 1d, removing the mold, and quickly moving the formed test piece into a curing box for standard curing.
Further, the cement in the step (1) is 42.5 RP.O cement produced by the Qinling Ridge Cement group in Shaanxi province.
Further, the crushed stone in the step (1) is limestone crushed stone with the particle size range of 5-20 mm, and the volume weight is 2700kg/m3The total sludge content was 0.2% and the bulk density was 1.62 kg/L.
Further, the clean medium sand of the dam river in the step (1) has a medium sand volume weight of 2630kg/m3The fineness modulus is 2.8, the integral mud content is 1.1 percent, and the bulk density is 1.5 kg/L.
Further, the water reducer in the step (1) is a JKPCA-02 type FDN high-efficiency water reducer produced by Shaanxi Haoyu concrete admixture limited company.
Further, the defoaming agent in the step (1) is tributyl phosphate defoaming agent produced by Shaanxi blue Xin chemical industry Co.
Further, the water in the step (1) is tap water.
Further, the CNFs described in the step (1) is carbon nanofibers produced by Beijing Dekk island gold technologies, the purity of the carbon nanofibers is 99.9%, the diameter of each monofilament is 100-200 mm, the length-diameter ratio is 70, the thermal conductivity is 2000W (m.DEG C) -1, the resistivity is less than 0.012 omega-cm, and the thermal expansion coefficient is 1 DEG C-1The specific surface area is 300m2·g-1Density of 0.18 g/cm-3。
Further, the standard curing temperature range in the step (4) is maintained at 20 +/-2 ℃ and the relative humidity RH is more than 95%.
Compared with the prior art, the invention has the following advantages:
the concrete prepared by the method meets the structural resistance and has effective electromagnetic shielding efficiency, realizes the multifunctionalization of materials, and has important military value and significance.
Detailed Description
A method for enhancing the resistance and the electromagnetic shielding performance of concrete by using carbon nanofibers comprises the following steps:
(1) weighing raw materials:
495kg/m of cement with the corresponding formula weight is weighed31008kg/m of crushed stone3672kg/m of sand3180kg/m of water30 to 0.9kg/m of defoaming agent30 to 15kg/m of water reducing agent30 to 0.9kg/m of carbon nanofibers3Standby;
(2) preparing a carbon nanofiber dispersion liquid:
A. pouring the water reducing agent weighed in the step (1) into the water weighed in the step (1), and stirring for 60s at 120r/min by using an electric stirrer;
B. pouring the carbon nanofibers weighed in the step (1) and half of the defoaming agent into a stirrer in the operation A, stirring for 150s at 300r/min, then adding the remaining half of the defoaming agent, and manually stirring for 5min until no obvious bubbles exist in the carbon nanofiber dispersion liquid;
(3) preparing a nano carbon fiber reinforced concrete mixture:
A. adding the sand and the crushed stone weighed in the step (1) into a forced stirrer, stirring for 60s, adding the cement weighed in the step (1), and stirring for 60 s;
B. adding the nano carbon fiber dispersion liquid prepared in the step (2) into a forced stirrer in the operation A while stirring, and stirring for 120s after the addition is finished;
(4) preparing the nano carbon fiber reinforced concrete:
pouring out the mixture of the nano carbon fiber reinforced concrete prepared in the step (3), manually turning and stirring for 60s, pouring, placing the mixture in a room, standing for 1d, removing the mold, and quickly moving the formed test piece into a curing box for standard curing.
The cement in the step (1) is 42.5 RP.O cement produced by the Qinling Ridge Cement group in Shaanxi province.
The crushed stone in the step (1) is limestone crushed stone with the particle size range of 5-20 mm, and the volume weight is 2700kg/m3The total sludge content was 0.2% and the bulk density was 1.62 kg/L.
The sand described in step (1)Clean medium produced from the dam river, the volume weight of the medium being 2630kg/m3The fineness modulus is 2.8, the integral mud content is 1.1 percent, and the bulk density is 1.5 kg/L.
The water reducer in the step (1) is a JKPCA-02 type FDN high-efficiency water reducer produced by Shaanxi Haoyu concrete admixture limited company.
The defoaming agent in the step (1) is tributyl phosphate defoaming agent produced by Shaanxi blue Xin chemical Co.
The water in the step (1) is tap water.
The CNFs described in the step (1) are carbon nanofibers produced by Beijing Dekkislandau technologies, Inc., the purity of the carbon nanofibers is 99.9%, the diameter of each monofilament is 100-200 mm, the length-diameter ratio is 70, and the thermal conductivity is 2000W · (m ℃)-1Resistivity less than 0.012 omega cm, thermal expansion coefficient 1 DEG C-1The specific surface area is 300m2·g-1Density of 0.18 g/cm-3。
And (4) maintaining the temperature range of 20 +/-2 ℃ and the relative humidity RH of more than 95% during standard maintenance.
For further explanation of the present invention, reference will now be made to the following specific examples.
Example 1
A method for enhancing the resistance and the electromagnetic shielding performance of concrete by using carbon nanofibers comprises the following steps:
(1) weighing raw materials:
495kg/m of cement with the corresponding formula weight is weighed31008kg/m of crushed stone3672kg/m of sand3180kg/m of water3(ii) a (2) Preparing a carbon nanofiber dispersion liquid:
(2) preparation of concrete mixture:
adding the sand and the crushed stone weighed in the step (1) into a forced stirrer, stirring for 60s, adding the cement weighed in the step (1), and stirring for 60 s;
(3) preparing concrete:
pouring the concrete mixture prepared in the step (2), manually turning and stirring for 60s, pouring, placing in a room, standing for 1d, removing the mold, and quickly moving the formed test piece into a curing box for standard curing.
The cement in the step (1) is 42.5 RP.O cement produced by the Qinling Ridge Cement group in Shaanxi province.
The crushed stone in the step (1) is limestone crushed stone with the particle size range of 12.5mm, and the volume weight is 2700kg/m3The total sludge content was 0.2% and the bulk density was 1.62 kg/L.
The clean medium sand of the sand production dam river in the step (1) has the volume weight of 2630kg/m3The fineness modulus is 2.8, the integral mud content is 1.1 percent, and the bulk density is 1.5 kg/L.
The water in the step (1) is tap water.
And (3) maintaining the temperature range of 20 +/-2 ℃ and the relative humidity RH of 95% during standard curing.
Example 2
A method for enhancing the resistance and the electromagnetic shielding performance of concrete by using carbon nanofibers comprises the following steps:
(1) weighing raw materials:
495kg/m of cement with the corresponding formula weight is weighed31008kg/m3 crushed stone and 672kg/m sand3180kg/m of water30.3kg/m of defoaming agent3And the water reducing agent is 7.5kg/m34.5kg/m of carbon nanofiber3Standby;
(2) preparing a carbon nanofiber dispersion liquid:
A. pouring the water reducing agent weighed in the step (1) into the water weighed in the step (1), and stirring for 60s at 120r/min by using an electric stirrer;
B. pouring the carbon nanofibers weighed in the step (1) and half of the defoaming agent into a stirrer in the operation A, stirring for 150s at 300r/min, then adding the remaining half of the defoaming agent, and manually stirring for 5min until no obvious bubbles exist in the carbon nanofiber dispersion liquid;
(3) preparing a nano carbon fiber reinforced concrete mixture:
A. adding the sand and the crushed stone weighed in the step (1) into a forced stirrer, stirring for 60s, adding the cement weighed in the step (1), and stirring for 60 s;
B. adding the nano carbon fiber dispersion liquid prepared in the step (2) into a forced stirrer in the operation A while stirring, and stirring for 120s after the addition is finished;
(4) preparing the nano carbon fiber reinforced concrete:
pouring out the mixture of the nano carbon fiber reinforced concrete prepared in the step (3), manually turning and stirring for 60s, pouring, placing the mixture in a room, standing for 1d, removing the mold, and quickly moving the formed test piece into a curing box for standard curing.
The cement in the step (1) is 42.5 RP.O cement produced by the Qinling Ridge Cement group in Shaanxi province.
The crushed stone in the step (1) is limestone crushed stone with the particle size range of 12.5mm, and the volume weight is 2700kg/m3The total sludge content was 0.2% and the bulk density was 1.62 kg/L.
The clean medium sand of the sand production dam river in the step (1) has the volume weight of 2630kg/m3The fineness modulus is 2.8, the integral mud content is 1.1 percent, and the bulk density is 1.5 kg/L.
The water reducer in the step (1) is a JKPCA-02 type FDN high-efficiency water reducer produced by Shaanxi Haoyu concrete admixture limited company.
The defoaming agent in the step (1) is tributyl phosphate defoaming agent produced by Shaanxi blue Xin chemical Co.
The water in the step (1) is tap water.
The CNFs described in step (1) are carbon nanofibers produced by Beijing Dekkislandau technologies, Inc., with a purity of 99.9%, a monofilament diameter of 150mm, a length-diameter ratio of 70, and a thermal conductivity of 2000W · (m ℃)-1The resistivity was 0.012. omega. cm, the thermal expansion coefficient was 1 ℃ C-1The specific surface area is 300m2·g-1Density of 0.18 g/cm-3。
And (4) maintaining the temperature range of 20 +/-2 ℃ and the relative humidity RH of 95% during standard curing.
Example 3
A method for enhancing the resistance and the electromagnetic shielding performance of concrete by using carbon nanofibers comprises the following steps:
(1) weighing raw materials:
495kg/m of cement with the corresponding formula weight is weighed31008kg/m of crushed stone3672kg/m of sand3180kg/m of water30.45kg/m of defoaming agent3And the water reducing agent is 7.5kg/m30.36kg/m of carbon nanofibers3Standby;
(2) preparing a carbon nanofiber dispersion liquid:
A. pouring the water reducing agent weighed in the step (1) into the water weighed in the step (1), and stirring for 60s at 120r/min by using an electric stirrer;
B. pouring the carbon nanofibers weighed in the step (1) and half of the defoaming agent into a stirrer in the operation A, stirring for 150s at 300r/min, then adding the remaining half of the defoaming agent, and manually stirring for 5min until no obvious bubbles exist in the carbon nanofiber dispersion liquid;
(3) preparing a nano carbon fiber reinforced concrete mixture:
A. adding the sand and the crushed stone weighed in the step (1) into a forced stirrer, stirring for 60s, adding the cement weighed in the step (1), and stirring for 60 s;
B. adding the nano carbon fiber dispersion liquid prepared in the step (2) into a forced stirrer in the operation A while stirring, and stirring for 120s after the addition is finished;
(4) preparing the nano carbon fiber reinforced concrete:
pouring out the mixture of the nano carbon fiber reinforced concrete prepared in the step (3), manually turning and stirring for 60s, pouring, placing the mixture in a room, standing for 1d, removing the mold, and quickly moving the formed test piece into a curing box for standard curing.
The cement in the step (1) is 42.5 RP.O cement produced by the Qinling Ridge Cement group in Shaanxi province.
The crushed stone in the step (1) is limestone crushed stone with the particle size range of 12.5mm, and the volume weight is 2700kg/m3The total sludge content was 0.2% and the bulk density was 1.62 kg/L.
The clean medium sand of the sand production dam river in the step (1) has the volume weight of 2630kg/m3Fineness modulus of 2.8, containingThe amount of sludge was 1.1%, and the bulk density was 1.5 kg/L.
The water reducer in the step (1) is a JKPCA-02 type FDN high-efficiency water reducer produced by Shaanxi Haoyu concrete admixture limited company.
The defoaming agent in the step (1) is tributyl phosphate defoaming agent produced by Shaanxi blue Xin chemical Co.
The water in the step (1) is tap water.
The CNFs described in step (1) are carbon nanofibers produced by Beijing Dekkislandau technologies, Inc., with a purity of 99.9%, a monofilament diameter of 150mm, a length-diameter ratio of 70, and a thermal conductivity of 2000W · (m ℃)-1The resistivity was 0.012. omega. cm, the thermal expansion coefficient was 1 ℃ C-1The specific surface area is 300m2·g-1Density of 0.18 g/cm-3。
And (4) maintaining the temperature range of 20 +/-2 ℃ and the relative humidity RH of 95% during standard curing.
Example 4
A method for enhancing the resistance and the electromagnetic shielding performance of concrete by using carbon nanofibers comprises the following steps:
(1) weighing raw materials:
495kg/m of cement with the corresponding formula weight is weighed31008kg/m of crushed stone3672kg/m of sand3180kg/m of water30.6kg/m of defoaming agent310kg/m of water reducing agent30.54kg/m of carbon nanofibers3Standby;
(2) preparing a carbon nanofiber dispersion liquid:
A. pouring the water reducing agent weighed in the step (1) into the water weighed in the step (1), and stirring for 60s at 120r/min by using an electric stirrer;
B. pouring the carbon nanofibers weighed in the step (1) and half of the defoaming agent into a stirrer in the operation A, stirring for 150s at 300r/min, then adding the remaining half of the defoaming agent, and manually stirring for 5min until no obvious bubbles exist in the carbon nanofiber dispersion liquid;
(3) preparing a nano carbon fiber reinforced concrete mixture:
A. adding the sand and the crushed stone weighed in the step (1) into a forced stirrer, stirring for 60s, adding the cement weighed in the step (1), and stirring for 60 s;
B. adding the nano carbon fiber dispersion liquid prepared in the step (2) into a forced stirrer in the operation A while stirring, and stirring for 120s after the addition is finished;
(4) preparing the nano carbon fiber reinforced concrete:
pouring out the mixture of the nano carbon fiber reinforced concrete prepared in the step (3), manually turning and stirring for 60s, pouring, placing the mixture in a room, standing for 1d, removing the mold, and quickly moving the formed test piece into a curing box for standard curing.
The cement in the step (1) is 42.5 RP.O cement produced by the Qinling Ridge Cement group in Shaanxi province.
The crushed stone in the step (1) is limestone crushed stone with the particle size range of 12.5mm, and the volume weight is 2700kg/m3The total sludge content was 0.2% and the bulk density was 1.62 kg/L.
The clean medium sand of the sand production dam river in the step (1) has the volume weight of 2630kg/m3The fineness modulus is 2.8, the integral mud content is 1.1 percent, and the bulk density is 1.5 kg/L.
The water reducer in the step (1) is a JKPCA-02 type FDN high-efficiency water reducer produced by Shaanxi Haoyu concrete admixture limited company.
The defoaming agent in the step (1) is tributyl phosphate defoaming agent produced by Shaanxi blue Xin chemical Co.
The water in the step (1) is tap water.
The CNFs described in the step (1) are carbon nanofibers produced by Beijing Dekkislandau technologies, Inc., the purity of the carbon nanofibers is 99.9%, the diameter of each monofilament is 100-200 mm, the length-diameter ratio is 70, and the thermal conductivity is 2000W · (m ℃)-1The resistivity was 0.012. omega. cm, the thermal expansion coefficient was 1 ℃ C-1The specific surface area is 300m2·g-1Density of 0.18 g/cm-3。
And (4) maintaining the temperature range of 20 +/-2 ℃ and the relative humidity RH of 95% during standard curing.
Example 5
A method for enhancing the resistance and the electromagnetic shielding performance of concrete by using carbon nanofibers comprises the following steps:
(1) weighing raw materials:
495kg/m of cement with the corresponding formula weight is weighed31008kg/m of crushed stone3672kg/m of sand3180kg/m of water30.9kg/m of defoaming agent315kg/m of water reducing agent30.9kg/m of carbon nanofibers3Standby;
(2) preparing a carbon nanofiber dispersion liquid:
A. pouring the water reducing agent weighed in the step (1) into the water weighed in the step (1), and stirring for 60s at 120r/min by using an electric stirrer;
B. pouring the carbon nanofibers weighed in the step (1) and half of the defoaming agent into a stirrer in the operation A, stirring for 150s at 300r/min, then adding the remaining half of the defoaming agent, and manually stirring for 5min until no obvious bubbles exist in the carbon nanofiber dispersion liquid;
(3) preparing a nano carbon fiber reinforced concrete mixture:
A. adding the sand and the crushed stone weighed in the step (1) into a forced stirrer, stirring for 60s, adding the cement weighed in the step (1), and stirring for 60 s;
B. adding the nano carbon fiber dispersion liquid prepared in the step (2) into a forced stirrer in the operation A while stirring, and stirring for 120s after the addition is finished;
(4) preparing the nano carbon fiber reinforced concrete:
pouring out the mixture of the nano carbon fiber reinforced concrete prepared in the step (3), manually turning and stirring for 60s, pouring, placing the mixture in a room, standing for 1d, removing the mold, and quickly moving the formed test piece into a curing box for standard curing.
The cement in the step (1) is 42.5 RP.O cement produced by the Qinling Ridge Cement group in Shaanxi province.
The crushed stone in the step (1) is limestone crushed stone with the particle size range of 12.5mm, and the volume weight is 2700kg/m3The overall mud content is 0.2 percent and the bulk density is 1.62kgL。
The clean medium sand of the sand production dam river in the step (1) has the volume weight of 2630kg/m3The fineness modulus is 2.8, the integral mud content is 1.1 percent, and the bulk density is 1.5 kg/L.
The water reducer in the step (1) is a JKPCA-02 type FDN high-efficiency water reducer produced by Shaanxi Haoyu concrete admixture limited company.
The defoaming agent in the step (1) is tributyl phosphate defoaming agent produced by Shaanxi blue Xin chemical Co.
The water in the step (1) is tap water.
The CNFs described in step (1) are carbon nanofibers produced by Beijing Dekkislandau technologies, Inc., with a purity of 99.9%, a monofilament diameter of 150mm, a length-diameter ratio of 70, and a thermal conductivity of 2000W · (m ℃)-1The resistivity was 0.012. omega. cm, the thermal expansion coefficient was 1 ℃ C-1The specific surface area is 300m2·g-1Density of 0.18 g/cm-3。
And (4) maintaining the temperature range of 20 +/-2 ℃ and the relative humidity RH of 95% during standard curing.
In order to compare the technical effects of the application, the concrete prepared by the methods of the embodiments 1 to 5 are respectively marked as PC, CNFC01, CNFC02, CNFC03 and CNFC05, and then the mechanical property test and the electromagnetic shielding property test are performed on the concrete prepared by the methods (the test frequency points are 1GHz, 2GHz, 5GHz, 7GHz, 10GHz, 12GHz, 15GHz and 18 GHz). The specific experimental comparison data are shown in tables 1 and 2 below:
TABLE 1 comparison of mechanical Property test data for concrete prepared by the methods of the examples
As can be seen from table 1 above, the static compressive strength: CNFC03 was increased by 9.2% compared to PC; dynamic compressive strength: when the loading rate is 6.5m/s, the CNFC03 is increased by 16.8% compared with PC; when the loading rate is 7.5m/s, the CNFC03 is increased by 23.2% compared with PC; when the loading rate is 8.5m/s, the CNFC03 is increased by 23.8% compared with PC; when the loading rate is 9.5m/s, the CNFC03 is increased by 11.8% compared with PC; at a loading rate of 10.5m/s, CNFC03 increased by 7.5% compared to PC.
TABLE 2 electromagnetic shielding effectiveness test results (dB) of concrete samples prepared by the methods of the examples
As can be seen from Table 2 above, at 1GHz, CNFC03 is increased by 250% compared with PC; at 2GHz, the CNFC03 is increased by 244.4% compared with PC; at 5GHz, the CNFC03 is increased by 320% compared with PC; at 7GHz, the CNFC03 is increased by 438.6% compared with PC; at 10GHz, the CNFC03 is increased by 375% compared with PC; at 12GHz, the CNFC03 is increased by 494.5% compared with PC; at 15GHz, the CNFC03 is increased by 387.0% compared with PC; at 18GHz, CNFC03 increased 373.1% compared to PC.
Claims (9)
1. A method for enhancing the concrete resistance and the electromagnetic shielding performance by using carbon nanofibers is characterized by comprising the following steps:
(1) weighing raw materials:
495kg/m of cement with the corresponding formula weight is weighed31008kg/m of crushed stone3672kg/m of sand3180kg/m of water30 to 0.9kg/m of defoaming agent30 to 15kg/m of water reducing agent30 to 0.9kg/m of carbon nanofibers3Standby;
(2) preparing a carbon nanofiber dispersion liquid:
A. pouring the water reducing agent weighed in the step (1) into the water weighed in the step (1), and stirring for 60s at 120r/min by using an electric stirrer;
B. pouring the carbon nanofibers weighed in the step (1) and half of the defoaming agent into a stirrer in the operation A, stirring for 150s at 300r/min, then adding the remaining half of the defoaming agent, and manually stirring for 5min until no obvious bubbles exist in the carbon nanofiber dispersion liquid;
(3) preparing a nano carbon fiber reinforced concrete mixture:
A. adding the sand and the crushed stone weighed in the step (1) into a forced stirrer, stirring for 60s, adding the cement weighed in the step (1), and stirring for 60 s;
B. adding the nano carbon fiber dispersion liquid prepared in the step (2) into a forced stirrer in the operation A while stirring, and stirring for 120s after the addition is finished;
(4) preparing the nano carbon fiber reinforced concrete:
pouring out the mixture of the nano carbon fiber reinforced concrete prepared in the step (3), manually turning and stirring for 60s, pouring, placing the mixture in a room, standing for 1d, removing the mold, and quickly moving the formed test piece into a curing box for standard curing.
2. The method of claim 1, wherein the cement of step (1) is 42.5 RP.O cement produced by the Qinling Ridge Cement group of Shaanxi province.
3. The method for enhancing the concrete resistance and the electromagnetic shielding performance by using the nano carbon fibers as claimed in claim 1, wherein the crushed stones in the step (1) are limestone crushed stones with the particle size range of 5-20 mm and the volume weight of 2700kg/m3The total sludge content was 0.2% and the bulk density was 1.62 kg/L.
4. The method for enhancing the concrete resistance and electromagnetic shielding performance by using the nano carbon fiber as claimed in claim 1, wherein the clean medium sand produced from the dam river in the step (1) has a volume weight of 2630kg/m3The fineness modulus is 2.8, the integral mud content is 1.1 percent, and the bulk density is 1.5 kg/L.
5. The method for enhancing the concrete resistance and the electromagnetic shielding performance by using the nano carbon fibers as claimed in claim 1, wherein the water reducing agent in the step (1) is JKPCA-02 type FDN high efficiency water reducing agent produced by Shanxi Haoyu concrete admixture, Inc.
6. The method for enhancing the concrete resistance and the electromagnetic shielding performance by using the nano carbon fiber as claimed in claim 1, wherein the antifoaming agent in the step (1) is tributyl phosphate antifoaming agent manufactured by Shaanxi blue Xin chemical industry Co., Ltd.
7. The method of claim 1, wherein the water used in step (1) is tap water.
8. The method of claim 1, wherein the CNFs in step (1) are carbon nanofibers produced by Beijing Dekk island gold technologies, Inc., with a purity of 99.9%, a monofilament diameter of 100-200 mm, an aspect ratio of 70, and a thermal conductivity of 2000W · (m · ° C)-1Resistivity less than 0.012 omega cm, thermal expansion coefficient 1 DEG C-1The specific surface area is 300m2·g-1Density of 0.18 g/cm-3。
9. The method for enhancing the concrete resistance and electromagnetic shielding performance by using the nano carbon fiber as claimed in claim 1, wherein the standard curing temperature range in the step (4) is maintained at 20 ± 2 ℃ and the relative humidity RH is more than 95%.
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