CN112225510A - Conductive carbon black composite cement mortar and preparation method thereof - Google Patents
Conductive carbon black composite cement mortar and preparation method thereof Download PDFInfo
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- CN112225510A CN112225510A CN202011131750.4A CN202011131750A CN112225510A CN 112225510 A CN112225510 A CN 112225510A CN 202011131750 A CN202011131750 A CN 202011131750A CN 112225510 A CN112225510 A CN 112225510A
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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
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/022—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
- C04B2111/90—Electrical properties
- C04B2111/94—Electrically conducting 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
Abstract
The invention provides conductive carbon black composite cement mortar and a preparation method thereof, belonging to the technical field of cement mortar construction. The conductive carbon black composite cement mortar provided by the invention comprises the following preparation raw materials in parts by mass: 380-420 parts of ordinary portland cement, 1300-1500 parts of medium sand, 270-310 parts of water and 1-12 parts of conductive carbon black Super-P. The conductive carbon black Super-P is added in a proper proportion, so that the conductivity is good, the conductivity of the cement mortar is greatly improved, the adopted conductive carbon black Super-P is simple to prepare, low in production cost and high in economical practicability, and the whole preparation process is simple and economical and is suitable for large-scale use. The results of the embodiment show that compared with the common cement mortar, the conductive carbon black composite cement mortar has the conductivity improved by three orders of magnitude, and the conductivity of the cement mortar is obviously improved.
Description
Technical Field
The invention relates to the technical field of cement mortar construction, in particular to conductive carbon black composite cement mortar and a preparation method thereof.
Background
The conductive mortar can be classified into ionic conductive mortar and composite conductive mortar according to the kind of the material. Electrolyte solution in the pores of the mortar is used as a conductive phase material, and free electrons in the solution move under an external voltage, so that the mortar has conductivity, and the mortar is ion conductive mortar. The solid conductive phase material is doped into the cement matrix to form a tunnel effect, so that the mortar has certain conductivity, and the composite conductive mortar is formed. The conductive cement-based composite material is prepared by mixing and stirring a conductive component, a cementing material and an aggregate. The conductive material is filled in the cement-based composite material, so that the resistivity of the cement-based composite material is obviously reduced to reach a conductive level, and the resistivity of the material regularly changes in the electrifying and deforming processes, so that the intelligence and the conductivity of the conductive cement-based composite material are displayed, and the conductive cement-based composite material is used for monitoring the structural crack condition, melting snow and ice, electromagnetic shielding, electric grounding engineering, protecting cathode reinforcing steel bars and the like.
Many scholars at home and abroad test different types of conductive additives, and mainly tend to use carbonaceous materials as conductive phase materials, such as carbon nanotubes, carbon fibers and the like. However, the production cost of materials such as carbon nanotubes and carbon fibers is high, and the production process is complex, which is not favorable for the development of the conductive cement-based composite material.
Disclosure of Invention
The invention aims to provide conductive carbon black composite cement mortar and a preparation method thereof, wherein conductive carbon black Super-P is used for the cement mortar, so that the conductive carbon black composite cement mortar is simple and economic, has lower cost, is suitable for large-scale production, has strong economic practicability, and can overcome the defect of higher cost of the conventional preparation of conductive cement mortar.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides conductive carbon black composite cement mortar which comprises the following preparation raw materials in parts by mass: 380-420 parts of ordinary portland cement, 1300-1500 parts of medium sand, 270-310 parts of water and 1-12 parts of conductive carbon black Super-P.
Preferably, the strength of the ordinary portland cement is 42.5.
Preferably, the fineness modulus of the medium sand is 2.6-2.9, and the mud content is less than 5%.
Preferably, the purity of the conductive carbon black Super-P is more than or equal to 99.5%, the particle size is 30-50 nm, and the specific surface area is 62m2/g。
The invention provides a preparation method of conductive carbon black composite cement mortar in the technical scheme, which comprises the following steps:
premixing common Portland cement, medium sand and conductive carbon black Super-P to obtain a premixed material;
and mixing and stirring the premixed material and water, and sequentially compacting, discharging bubbles, forming and maintaining the obtained mixture to obtain the conductive carbon black composite cement mortar.
Preferably, the stirring speed of the pre-stirring is 42r/min, and the time is 120-150 s.
Preferably, the rotation speed of the mixing and stirring is 42r/min, and the time is 60-80 s.
Preferably, the tapping time is 30-50 s.
Preferably, the forming temperature is 20 +/-2 ℃, the humidity is 20%, and the time is 24 h.
Preferably, the curing temperature is 20 +/-2 ℃, the humidity is more than or equal to 95 percent, and the curing time is 28 days.
The invention provides conductive carbon black composite cement mortar which comprises the following preparation raw materials in parts by mass: 380-420 parts of ordinary portland cement, 1300-1500 parts of medium sand, 270-310 parts of water and 1-12 parts of conductive carbon black Super-P. The conductive carbon black Super-P is added in a proper proportion, so that the conductivity is good, the conductivity of the cement mortar is greatly improved, the adopted conductive carbon black Super-P is simple to prepare, low in production cost and high in economical practicability, and the whole preparation process is simple and economical and is suitable for large-scale use. The results of the embodiment show that compared with the common cement mortar, the conductive carbon black composite cement mortar has the conductivity improved by three orders of magnitude, and the conductivity of the cement mortar is obviously improved.
The invention provides a preparation method of the conductive carbon black composite cement mortar, which can prepare the conductive carbon black composite cement mortar only by mixing, pouring, forming and curing, and is simple and easy to operate.
Drawings
FIG. 1 is SEM images of conductive carbon black Super-P under different magnifications;
FIG. 2 is a graph showing the consistency of cement mortars prepared in examples 1 to 6 and comparative example 1 as a function of the percentage of conductive carbon black Super-P;
FIG. 3 is a graph showing the 28-day compressive properties of the cement mortars prepared in examples 1 to 6 and comparative example 1 as a function of the percentage of the Super-P content of the conductive carbon black;
FIG. 4 is a graph showing the 28-day fracture resistance of cement mortars prepared in examples 1 to 6 and comparative example 1 as a function of the percentage of conductive carbon black Super-P;
FIG. 5 is a graph showing the variation of the resistivity of cement mortars prepared in examples 1 to 6 and comparative example 1 with the percentage of the Super-P content of conductive carbon black;
FIG. 6 is a graph showing the change of resistivity with curing age of cement mortars prepared in examples 1 to 6 and comparative example 1.
Detailed Description
The invention provides conductive carbon black composite cement mortar which comprises the following preparation raw materials in parts by mass: 380-420 parts of ordinary portland cement, 1300-1500 parts of medium sand, 270-310 parts of water and 1-12 parts of conductive carbon black Super-P.
In the present invention, unless otherwise specified, all the starting materials required for the preparation are commercially available products well known to those skilled in the art.
The preparation raw materials of the conductive carbon black composite cement mortar comprise 380-420 parts by mass of ordinary portland cement, preferably 390-410 parts by mass of ordinary portland cement, and more preferably 400 parts by mass of ordinary portland cement. In the present invention, the strength of the ordinary portland cement is preferably 42.5. The invention uses ordinary Portland cement as the basic raw material of the composite cement mortar.
The preparation raw materials of the conductive carbon black composite cement mortar comprise 1300-1500 parts of medium sand, preferably 1350-1450 parts of medium sand, and more preferably 1400 parts of common Portland cement by mass. In the invention, the fineness modulus of the medium sand is preferably 2.6-2.9, and the mud content is preferably less than 5%. The invention utilizes the medium sand to meet the grading requirement and improve the construction workability of cement mortar.
Based on the mass parts of the ordinary Portland cement, the preparation raw material of the conductive carbon black composite cement mortar provided by the invention comprises 270-310 parts of water, preferably 280-300 parts of water, and more preferably 290 parts of water.
The preparation raw materials of the conductive carbon black composite cement mortar comprise, by mass, 1-12 parts of conductive carbon black Super-P, preferably 3-10 parts of conductive carbon black, and more preferably 5-8 parts of conductive carbon black Super-P. In the invention, the purity of the conductive carbon black Super-P is preferably equal to or more than 99.5%, the particle size is preferably 30-50 nm, more preferably 40nm, and the specific surface area is preferably 62m2(ii) in terms of/g. The conductive carbon black Super-P is not dispersed in water and has excellent conductivity, the conductive carbon black Super-P is used as a conductive phase material in cement mortar, the conductive carbon black Super-P is used as a nano material, the particle size is extremely small, and the conductive carbon black Super-P can generate a conductive effect and a polarization effect when being doped into the cement mortar, thereby being beneficial to improving the conductive performance of the composite cement mortar.
The invention provides a preparation method of conductive carbon black composite cement mortar in the technical scheme, which comprises the following steps:
premixing common Portland cement, medium sand and conductive carbon black Super-P to obtain a premixed material;
and mixing and stirring the premixed material and water, and sequentially compacting, discharging bubbles, forming and maintaining the obtained mixture to obtain the conductive carbon black composite cement mortar.
The invention pre-mixes ordinary portland cement, medium sand and conductive carbon black Super-P to obtain a pre-mixed material. In the present invention, the premixing is preferably performed in a mortar mixer, and the stirring speed of the premixing is preferably 42r/min, and the time is preferably 120 to 150s, and more preferably 130 to 140 s. The invention enables the conductive carbon black Super-P to be more fully mixed with the ordinary Portland cement and the medium sand through premixing.
After the premixed material is obtained, the premixed material and water are mixed and stirred, and the obtained mixture is subjected to compaction, foam discharging, forming and maintenance in sequence to obtain the conductive carbon black composite cement mortar. According to the invention, water is preferably added into the mortar mixer for mixing and stirring. In the invention, the rotation speed of the mixing and stirring is preferably 42r/min, the time is preferably 60-80 s, and more preferably 65-75 s.
After the mixing and stirring are finished, the obtained mixture is compacted and bubble removal, the mixture is preferably poured into an oiling test mold, compaction and bubble removal are carried out on a mortar compaction table, and then slurry on the upper surface of the oiling test mold is wiped off to enable the upper surface of a test piece to be flat. The oiling test die is not specially limited, and the oiling test die known in the field can be selected. In the invention, the tapping time is preferably 30-50 s, and more preferably 35-45 s; the other processes for tapping are not particularly limited in the present invention, and may be performed according to processes well known in the art. The invention discharges the internal gas of the mixture through compaction and foaming to ensure that the cement mortar is more compact.
After the compaction and bubble removal are finished, the test piece arranged in the test die is molded; the forming is preferably carried out in a thermostatic chamber, the forming temperature is preferably 20 +/-2 ℃, the humidity is preferably 20%, and the time is preferably 24 h. After the formation is completed, the present invention preferably performs the removal of the mold.
After the molding is finished, the obtained test piece is maintained, and the maintenance is preferably carried out in a standard maintenance room; the curing temperature is preferably 20 +/-2 ℃, the humidity is preferably more than or equal to 95 percent, and the time is preferably 28 days. The invention ensures the strength of the test piece through maintenance.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following examples, all cements were usedThe common Portland cement with the strength of 42.5 has the fineness modulus of medium sand of 2.7 and the mud content of less than 5 percent; the purity of the conductive carbon black Super-P is more than or equal to 99.5 percent, the particle size of the conductive carbon black Super-P is 40nm, and the specific surface area is 62m2/g。
Example 1
Putting 1 part of conductive carbon black Super-P, 400 parts of cement and 1400 parts of medium sand into a mortar stirrer with the rotating speed of 42r/min, performing premixing for 130s to obtain a premixed material, then adding 290 parts of water into the mortar stirrer, keeping the rotating speed unchanged, and continuously performing mixing and stirring for 80s to obtain a mixture; pouring the mixture into an oiling test mold, compacting and discharging bubbles on a mortar compacting table for 40s, wiping off slurry on the upper surface of the test mold to enable the upper surface of a test piece to be flat, then placing the test piece in a constant temperature room with the temperature of 20 ℃ and the humidity of 20%, maintaining for 24 hours, and then removing the mold; after the mold is removed, the obtained test piece is placed in a standard curing room with the temperature of 20 +/-2 ℃ and the humidity of more than or equal to 95 percent, and the curing is carried out for 28 days, so as to obtain the conductive carbon black composite cement mortar.
Example 2
The only difference from example 1 is: 2 parts of conductive carbon black Super-P are added.
Example 3
The only difference from example 1 is: 3 parts of conductive carbon black Super-P are added.
Example 4
The only difference from example 1 is: 4 parts of conductive carbon black Super-P are added.
Example 5
The only difference from example 1 is: 8 parts of conductive carbon black Super-P was added.
Example 6
The only difference from example 1 is: 12 parts of conductive carbon black Super-P was added.
Comparative example 1
The only difference from example 1 is: conductive carbon black Super-P was not added.
Performance testing
1) Performing performance tests on the cement mortars prepared in the embodiments 1-6 and the comparative example 1, wherein the consistency test is performed according to the JGJ/T70-2009 specification, the mechanical property test is performed according to GB17671-1999, and the conductivity test is performed by adopting a two-pole method; wherein the consistency and the basic mechanical properties of 28d are shown in Table 1, and the conductivity change in 28d is shown in resistivity, as shown in Table 2.
TABLE 1 thickness and mechanical Properties data for the Cement mortars prepared in examples 1-6 and comparative example 1
| Consistency (mm) | Compressive strength (MPa) | Flexural strength (MPa) | |
| Comparative example 1 | 77 | 36.3 | 4.72 |
| Example 1 | 69 | 37.2 | 5.55 |
| Example 2 | 59 | 30.6 | 5.1 |
| Example 3 | 42 | 31.9 | 5.0 |
| Example 4 | 32 | 31.1 | 5.05 |
| Example 5 | 26 | 30.1 | 4.95 |
| Example 6 | 13 | 29.8 | 4.92 |
As can be seen from Table 1, the addition of Super-P reduces the workability of the cement mortar slurry, and conforms to the rule that most nano materials are added into cement-based materials; in addition, compared with common cement mortar, the mechanical properties of the conductive carbon black composite cement mortar prepared by the invention are less influenced, and the basic mechanical properties of the cement mortar are ensured by the invention.
TABLE 2 changes in resistivity of cement mortars 28d prepared in examples 1-6 and comparative example 1
As can be seen from Table 2, with the change of the Super-P doping amount of the conductive carbon black, the resistivity of the prepared conductive carbon black composite cement mortar is changed, and the conductive carbon black composite cement mortar prepared in the examples 5 to 6 is reduced by three orders of magnitude compared with the conductive carbon black composite cement mortar prepared in the comparative example 1, so that the conductivity is greatly improved. In the actual production process, the invention can improve the conductivity of the conductive cement mortar by properly adjusting the weight parts of the portland cement, the medium sand, the water and the conductive carbon black Super-P.
2) SEM test is carried out on the conductive carbon black Super-P used in the invention, the result is shown in figure 1, figure 1 is an SEM image of the conductive carbon black Super-P under different multiplying factors, and as can be seen from figure 1, the conductive carbon black Super-P has a nano microstructure inside, and the nano microstructure can fill gaps inside cement mortar, enhance the continuity of a conductive path and contribute to the improvement of the conductivity of the cement mortar.
3) The consistencies of the cement mortars prepared in examples 1 to 6 and comparative example 1 were plotted on the abscissa as the percentage of the amount of the conductive carbon black (percentage with respect to the cement), and the results are shown in fig. 2. FIG. 2 is a graph showing the consistency of the cement mortars prepared in examples 1 to 6 and comparative example 1 as a function of the percentage of the Super-P content of the conductive carbon black, and it can be seen from FIG. 2 that the consistency of the cement mortars gradually decreases as the Super-P content of the conductive carbon black increases.
4) The 28-day mechanical property data of the cement mortars prepared in examples 1 to 6 and comparative example 1 were plotted on the abscissa as the percentage of the conductive carbon black (percentage with respect to the cement), and the results are shown in fig. 3 and 4. FIG. 3 is a graph showing the 28-day compressive properties of the cement mortars prepared in examples 1 to 6 and comparative example 1 as a function of the percentage of the Super-P content of the conductive carbon black; FIG. 4 is a graph showing the 28-day fracture resistance of the cement mortars prepared in examples 1 to 6 and comparative example 1, which is changed along with the percentage of the conductive carbon black Super-P, and it can be seen from FIG. 3 and FIG. 4 that the compression resistance and the fracture resistance of the conductive carbon black composite cement mortar prepared by the invention are less affected than those of the common cement mortar, and the basic mechanical properties of the cement mortar are ensured by the invention.
5) The resistivity data of the cement mortars prepared in examples 1 to 6 and comparative example 1 were plotted on the abscissa as the percentage of the conductive carbon black (percentage with respect to the cement), and the results are shown in fig. 5. FIG. 5 is a graph showing the variation of the resistivity of cement mortars prepared in examples 1 to 6 and comparative example 1 with the percentage of the Super-P content of conductive carbon black. As can be seen from FIG. 5, the conductivity of the cement mortar can be directly influenced by the change of the doping amount of the conductive carbon black Super-P, and the conductivity of the cement mortar can be changed by controlling the doping amount of the conductive carbon black Super-P.
6) FIG. 6 is a graph showing the change of resistivity with curing age of cement mortars prepared in examples 1 to 6 and comparative example 1. As can be seen from fig. 6, the resistivity of the cement mortar increases and the conductivity decreases with the increase of age, and the resistivity is relatively stable at age 14 to 28 days.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The conductive carbon black composite cement mortar comprises the following preparation raw materials in parts by mass: 380-420 parts of ordinary portland cement, 1300-1500 parts of medium sand, 270-310 parts of water and 1-12 parts of conductive carbon black Super-P.
2. The conductive carbon black composite cement mortar according to claim 1, wherein the strength of the ordinary portland cement is 42.5.
3. The conductive carbon black composite cement mortar according to claim 1, wherein the fineness modulus of the medium sand is 2.6-2.9, and the mud content is less than 5%.
4. The conductive carbon black composite cement mortar as claimed in claim 1, wherein the conductive carbon black Super-P has a purity of not less than 99.5%, a particle size of 30-50 nm, and a specific surface area of 62m2/g。
5. A method for preparing the conductive carbon black composite cement mortar of any one of claims 1 to 4, comprising the following steps:
premixing common Portland cement, medium sand and conductive carbon black Super-P to obtain a premixed material;
and mixing and stirring the premixed material and water, and sequentially compacting, discharging bubbles, forming and maintaining the obtained mixture to obtain the conductive carbon black composite cement mortar.
6. The preparation method of claim 5, wherein the stirring speed of the pre-mixing is 42r/min and the time is 120-150 s.
7. The preparation method according to claim 5, wherein the mixing and stirring speed is 42r/min and the time is 60-80 s.
8. The method according to claim 5, wherein the tapping time is 30 to 50 seconds.
9. The method according to claim 5, wherein the molding temperature is 20 ± 2 ℃ and the humidity is 20% for 24 hours.
10. The preparation method according to claim 5, wherein the curing temperature is 20 ± 2 ℃, the humidity is not less than 95%, and the curing time is 28 days.
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