CN115504721B - Reinforced fly ash-based alkali-activated material and preparation method thereof - Google Patents
Reinforced fly ash-based alkali-activated material and preparation method thereof Download PDFInfo
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- CN115504721B CN115504721B CN202211331495.7A CN202211331495A CN115504721B CN 115504721 B CN115504721 B CN 115504721B CN 202211331495 A CN202211331495 A CN 202211331495A CN 115504721 B CN115504721 B CN 115504721B
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- 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
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- C—CHEMISTRY; METALLURGY
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- 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
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- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
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- C04B20/023—Chemical treatment
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- 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
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- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
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- C25D5/54—Electroplating of non-metallic surfaces
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- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
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Abstract
The invention provides a reinforced fly ash-based alkali-activated material and a preparation method thereof, wherein the reinforced fly ash-based alkali-activated material comprises the following components: the production method comprises the following steps of (1) regenerating carbon fiber chopped fibers and alkali-activated material dry materials, wherein the regenerating carbon fiber chopped fibers comprise at least one of common regenerating carbon fiber chopped fibers and modified regenerating carbon fiber chopped fibers; the ratio of the total dry weight of the regenerated carbon fiber chopped fibers to the dry weight of the alkali-activated material dry material is (0.32-0.65): 100. the invention can improve the ductility and toughness of the fly ash-based alkali-activated material.
Description
Technical Field
The invention relates to the technical field of fly ash-based alkali-activated materials, in particular to a fly ash-based alkali-activated material reinforced by thermally cracked regenerated carbon fibers and a preparation method thereof.
Background
Ordinary portland cement has the advantages of high strength, easy operation and production, etc., and is one of the most widely used materials known in the world. However, the global greenhouse effect is exacerbated by the carbon dioxide emissions during its production or calcination, which account for about 7% of the total global carbon dioxide emissions.
The fly ash is a coal combustion product and mainly comes from solid particles in flue gas ash in the combustion process of a coal-fired power plant. In order to reduce energy consumption and carbon dioxide emission in the construction field, the fly ash-based alkali-activated material is a promising construction material, and has many advantages such as high strength, compact microstructure, high chemical stability, and excellent heat resistance. However, alkali-activated materials are more brittle and have low toughness. To overcome this drawback, carbon fiber materials have been used as reinforcing materials and to reinforce alkali-activated materials in the form of dispersed short fibers, continuous long multifilaments, and woven fabrics.
However, the new carbon fiber is expensive and the production process thereof consumes a lot of energy. The thermal cracking regenerated carbon fiber is a high-value high-strength recycled carbon fiber product, and is derived from recycling of carbon fiber composite wastes. However, in practical application, the binding capacity of the regenerated carbon fiber and the alkali-activated material is poor, so that the performance of the fly ash-based alkali-activated material reinforced by the regenerated carbon fiber is poor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a reinforced fly ash-based alkali-activated material and a preparation method thereof, so as to improve the ductility and toughness of the fly ash-based alkali-activated material.
According to one aspect of the present invention there is provided a reinforced fly ash based alkali-activated material, the material comprising: the production method comprises the following steps of (1) regenerating carbon fiber chopped fibers and alkali-activated material dry materials, wherein the regenerating carbon fiber chopped fibers comprise at least one of common regenerating carbon fiber chopped fibers and modified regenerating carbon fiber chopped fibers; the ratio of the total dry weight of the regenerated carbon fiber chopped fibers to the dry weight of the alkali-activated material dry material is (0.32-0.65): 100.
further, the reinforced fly ash-based alkali-activated material comprises the following components in parts by weight: 45 parts of low-calcium fly ash, 19 parts of granulated blast furnace slag, 11 parts of sodium silicate dry powder, 0.32-0.65 part of regenerated carbon fiber chopped fiber and 24-31 parts of water.
Further, the mass part ratio of the total dry weight of the modified regenerated carbon fiber chopped fibers to the dry weight of the alkali-activated material dry material is 0.65:100.
further, the preparation method of the regenerated carbon fiber chopped fiber comprises the following steps:
connecting the regenerated carbon fiber serving as an anode with the anode of a direct-current power supply, and immersing the regenerated carbon fiber into a sodium hydroxide solution;
connecting a graphite rod serving as a cathode with a negative electrode of a direct current power supply, and immersing the graphite rod into a sodium hydroxide solution;
turning on a power supply to carry out anodic oxidation treatment on the regenerated carbon fiber, taking out after the oxidation process is finished, washing with water, and then, suspending and drying at room temperature to obtain the surface modified regenerated carbon fiber;
and cutting the surface modified regenerated carbon fiber at room temperature to obtain the modified regenerated carbon fiber chopped fiber.
Further, the mass fraction of the sodium hydroxide solution is 0.014 to 0.028%.
Further, the suspension drying at room temperature after the water washing comprises: the mixture is washed three to five times with water and then suspended and dried for 6 to 24 hours at room temperature.
Further, cutting the surface-modified regenerated carbon fiber at room temperature, comprising: and cutting the surface modified regenerated carbon fiber at room temperature by using a rotary cutting machine, and collecting the cut carbon fiber after cutting to obtain the modified regenerated carbon fiber chopped fiber.
Furthermore, the length of the regenerated carbon fiber chopped fiber is 0.1-1.2 mm, and the average length is 0.4-0.6 mm.
According to another aspect of the present invention, there is provided a method for preparing the reinforced fly ash-based alkali-activated material, the method comprising:
mixing and stirring the low-calcium fly ash, the granulated blast furnace slag and the sodium silicate dry powder with the regenerated carbon fiber chopped fiber;
and then adding water and continuously stirring to obtain the reinforced fly ash-based alkali-activated composite material.
Further, the addition of water continues the stirring, wherein: the stirring time is 3 to 5 minutes.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the regenerated carbon fiber chopped fibers are added into the dry fly ash-based alkali-activated material as the reinforcing material, so that the prepared reinforced fly ash-based alkali-activated material has high strength and good toughness, and meanwhile, the modified regenerated carbon fiber chopped fibers are obtained by modifying the surface of the regenerated carbon fibers, so that the bending resistance mechanical property of the reinforced fly ash-based alkali-activated composite material can be further increased, the crack growth of the alkali-activated material can be resisted, and the toughness and ductility of the alkali-activated material are improved.
2. According to the invention, an oxygen-containing functional group is formed on the surface of the regenerated carbon fiber by adopting an electrochemical modification method, and loose carbonaceous impurities on the surface are removed, so that the interface connection performance of the regenerated carbon fiber chopped fiber and the fly ash-based alkali-activated material is enhanced, and the high-strength characteristic of the carbon fiber is favorably exerted.
3. The preparation method has simple process, can reduce the treatment pressure of industrial wastes such as fly ash, furnace stone slag, carbon fiber composite material wastes and the like, and is waste-utilizing and environment-friendly; meanwhile, the regenerated carbon fiber surface modification technology has low energy consumption, strong controllability and further optimization potential and can be used for large-scale industrialized production line operation.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a scanning electron microscope characterization result chart of the surface of an untreated regenerated carbon fiber according to a comparative example of the present invention;
FIG. 2 is a scanning electron microscope characterization result diagram of the surface of the regenerated carbon fiber after surface modification according to the embodiment of the invention;
fig. 3 is a scanning electron microscope characterization result graph of 28-day-old alkali-activated material doped with surface-modified regenerated carbon fibers according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the concept of the invention. All falling within the scope of the present invention.
Because the bonding capability of the regenerated carbon fiber and the alkali-activated material in the prior art is poor, the surface of the regenerated carbon fiber needs to be modified in order to further improve the toughness of the fly ash-based alkali-activated material and efficiently utilize the high-strength characteristic of the regenerated carbon fiber. Therefore, the embodiment of the invention provides a reinforced fly ash-based alkali-activated material, in particular to a modified regenerated carbon fiber chopped fiber reinforced fly ash-based alkali-activated material, which comprises the following components: the regeneration carbon fiber chopped fiber and the alkali-activated material dry material are prepared by mixing regenerated carbon fiber chopped fiber and alkali-activated material dry material, wherein the regenerated carbon fiber chopped fiber comprises at least one of common regenerated carbon fiber chopped fiber and modified regenerated carbon fiber chopped fiber; the common regenerated carbon fiber chopped fiber is obtained by cutting regenerated carbon fiber (untreated), the modified regenerated carbon fiber chopped fiber is obtained by modifying the surface of the regenerated carbon fiber and cutting, and the ratio of the total dry weight of the regenerated carbon fiber chopped fiber to the dry weight of the alkali-activated material dry material is (0.32-0.65) in parts by weight: 100, the dry weight ratio can improve the toughness and ductility of the alkali-activated material, and the dry weight ratio of the regenerated carbon fiber chopped fiber is more than or less than the value, which causes the strength and the toughness of the composite material to be reduced.
In some preferred embodiments, the mass part ratio of the total dry weight of the modified regenerated carbon fiber chopped fibers to the dry weight of the alkali-activated material dry material is 0.65:100.
the different contents of the components in the raw materials can cause the change of the proportions of Ca, si and Al, and the different proportions of Ca, si and Al can form materials with different chemical structures, thereby influencing the strength of the composite material. In some preferred embodiments, the reinforced fly ash-based alkali-activated material comprises, in parts by mass: 45 parts of low-calcium fly ash, 19 parts of granulated blast furnace slag, 11 parts of sodium silicate dry powder (or called sodium silicate), 0.32-0.65 part of regenerated carbon fiber chopped fiber and 24-31 parts of water, so that the reinforced fly ash-based alkali-activated material has higher strength and good toughness and ductility.
By adopting the technical scheme, the optimal weight ratio of the water and the regenerated carbon fiber chopped fibers in the alkali-activated composite material is optimized. Meanwhile, the modified regenerated carbon fiber chopped fibers are obtained by surface modification of the regenerated carbon fibers, so that the bonding strength of the regenerated carbon fibers and the base body of the alkali-activated composite material can be enhanced, when the alkali-activated composite material is subjected to external forces such as pressure, tension and the like, the carbon fibers in the base body can play a role in crack bridging, and the crack extension and expansion of the alkali-activated composite material are controlled, so that the toughness and the strength of the fly ash-based alkali-activated composite material are improved.
In some embodiments, a method of preparing a modified regenerated carbon fiber chopped fiber comprises:
s1, connecting regenerated carbon fibers serving as anodes with anodes of a direct-current power supply, and immersing the regenerated carbon fibers into a sodium hydroxide solution; preferably, the sodium hydroxide solution has a mass fraction of 0.014 to 0.028%, which is favorable for providing hydroxyl (OH) - ) Ions are added to remove coke on the surface of the regenerated carbon fiber and introduce oxygen-containing functional groups on the surface.
S2, connecting a graphite rod serving as a cathode with a negative electrode of a direct current power supply, and immersing the graphite rod into a sodium hydroxide solution;
s3, turning on a power supply to carry out anodic oxidation treatment on the regenerated carbon fibers, taking out after the oxidation process is finished, washing with water, and then, suspending and drying at room temperature to obtain surface-modified regenerated carbon fibers;
and S4, cutting the surface modified regenerated carbon fiber at room temperature to obtain the modified regenerated carbon fiber chopped fiber.
In a preferred embodiment, the voltage is set to 1 volt; in another preferred embodiment, the voltage is set at 3 volts, the time is set at 15 minutes, the voltage is higher than 3 volts, or the time is longer than 15 minutes, which can adversely affect the fiber strength.
In some embodiments, the suspension drying at room temperature after rinsing with water comprises: the fiber is washed for three to five times by water so as to eliminate the influence of redundant sodium (Na) ions, thereby verifying the fiber surface modification effect; and then hanging and drying for 6-24 hours at room temperature to meet the drying state required when the fiber is doped into the dry material and prevent the moisture on the fiber from reacting with the dry material in advance.
In some embodiments, the surface-modified regenerated carbon fiber is cut at room temperature, comprising: and cutting the surface modified regenerated carbon fiber at room temperature by using a rotary cutting machine, and collecting the cut carbon fiber after cutting to obtain the modified regenerated carbon fiber chopped fiber. The rotary cutting machine is simple to operate and easy to obtain; meanwhile, the distribution condition of the fiber length cut by the rotary cutting machine is relatively stable.
Through the technical scheme, loose carbon impurities on the surface of the regenerated carbon fiber are removed through anodic oxidation treatment, and meanwhile, oxygen-containing active groups on the surface are increased, so that the subsequent fly ash-based alkali-activated composite material is tightly combined with the regenerated carbon fiber, the alkali-activated material is coated on the surface of the regenerated carbon fiber, the mechanical transfer of the regenerated carbon fiber and the alkali-activated material matrix is improved, and the mechanical property of the fly ash-based alkali-activated composite material is enhanced. In some embodiments, the regenerated carbon fiber chopped fibers have a length of 0.1 to 1.2 millimeters and an average length of 0.4 to 0.6 millimeters. The short-cut regenerated carbon fiber is short in length and convenient to disperse, so that the traditional step of dispersing the carbon fiber in water can be omitted, the mixing efficiency is increased, and the preparation time is shortened.
Another embodiment of the present invention provides a method for preparing the reinforced fly ash-based alkali-activated material, including: mixing and stirring the low-calcium fly ash, the granulated blast furnace slag and the sodium silicate dry powder with the regenerated carbon fiber chopped fiber; and then adding water and continuing stirring, wherein the stirring time is preferably 3-5 minutes in order to avoid water evaporation caused by overlong stirring time, so that the reinforced fly ash-based alkali-activated composite material is obtained.
By adopting the technical scheme, the carbon fiber and the alkali-activated material dry powder are added simultaneously, so that the operation steps are simplified. The added carbon fiber has shorter length, so the dispersion is convenient, the traditional step of dispersing the carbon fiber in water is omitted, the mixing efficiency is increased, and the preparation time is shortened. The preparation method has simple process flow, can reduce the treatment pressure of industrial wastes such as fly ash, furnace stone slag, carbon fiber composite wastes and the like, and has the advantages of energy conservation, waste utilization, low carbon and environmental protection; meanwhile, the regenerated carbon fiber surface modification technology has low energy consumption, strong controllability and further optimization potential and can be used for large-scale industrialized pipeline operation.
The present invention is further described below by way of examples and comparative examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the non-essential modifications and adjustments made by those skilled in the art according to the above disclosure still belong to the scope of the present invention.
Example 1
The reinforced fly ash-based alkali-activated material provided in example 1 is a regenerated carbon fiber-reinforced fly ash-based alkali-activated material, and the preparation method thereof includes the following steps:
step 1: and preparing regenerated carbon fiber chopped fibers (common regenerated carbon fiber chopped fibers).
Cutting the regenerated carbon fiber at room temperature for 60 seconds by using a rotary cutting machine, and collecting short fibers after cutting to obtain the regenerated carbon fiber chopped fiber. The obtained chopped carbon fiber was subjected to length measurement using an optical microscope, and the obtained probability distribution results of the length a are shown in table 1 below:
TABLE 1 Length probability distribution results for regenerated carbon fiber chopped fibers
| 0≤a＜0.2 | 0.2≤a＜0.4 | 0.4≤a＜0.6 | 0.6≤a＜0.8 | 0.8≤a＜1 | 1≤a |
| (mm) | (mm) | (mm) | (mm) | (mm) | (mm) |
| 13.4％ | 28.5％ | 26.6％ | 15.7％ | 9.1％ | 6.8％ |
As can be seen from the length probability distribution in Table 1, the lengths of the chopped fibers of the regenerated carbon fibers are mainly concentrated in the range of 0.2 to 0.6 mm, and the average length of the fibers is 0.4 to 0.6 mm. Because the length of the fiber is short, the fiber is not easy to wind when being mixed with the alkali-activated material dry material, the negative influence of agglomeration can be reduced, and the dispersion distribution is facilitated. Meanwhile, the regenerated carbon fiber chopped fibers are wide in length distribution, so that the cracks with different sizes can be controlled, and the development and extension of the alkali-activated composite material from micro cracks to macro cracks can be limited under the action of external force, so that the limit mechanical property of the matrix is improved.
Step 2: preparing the regenerated carbon fiber (common regenerated carbon fiber) reinforced alkali-activated composite material.
Step 2.1: referring to table 2, low-calcium fly ash (fly ash), granulated blast furnace slag (blast furnace slag) and sodium silicate dry powder (sodium silicate) are mixed according to the mass ratio of 49.
Step 2.2: and (3) adding the regenerated carbon fiber chopped fibers prepared in the step (1) into the mixed dry material prepared in the step (2.1). The ratio of the total dry weight of the regenerated carbon fiber chopped fibers to the dry weight of the alkali-activated composite material in the step 2.1 is 0.32:100. mixing and stirring uniformly.
Step 2.3: according to the ratio of water to alkali-activated material dry material of 0.4: adding water and stirring for 3 minutes, pouring slurry of the regenerated carbon fiber reinforced alkali-activated composite material into a mold for shaping, shaking for 1 minute to remove bubbles, sealing the mold with a PVA plastic bag, curing for 24 hours, then demolding, putting the taken regenerated carbon fiber reinforced alkali-activated composite material test piece into the PVA plastic bag again, continuing to seal and cure under the constant temperature condition of 24 ℃, and detecting the strength in 28 days.
TABLE 2 Components in examples and comparative examples
Examples 2 to 4
Examples 2 to 4 are different from example 1 in the amount of water used from the amount of the ordinary regenerated carbon fiber chopped fibers, and the specific amounts are shown in table 2.
Example 5
The difference between this example and example 4 is that in step 1, the common regenerated carbon fibers are replaced by modified regenerated carbon fibers, modified regenerated carbon fiber chopped fibers are obtained after cutting, and in step 2.2, the common regenerated carbon fiber chopped fibers are replaced by the same amount of modified regenerated carbon fiber chopped fibers.
The modified regenerated carbon fiber chopped fiber is prepared by the following method, which comprises the following steps:
s1, preparing a sodium hydroxide solution with the mass fraction of 0.014%, and immersing the regenerated carbon fiber fabric in the sodium hydroxide solution at room temperature. The regenerated carbon fiber fabric is used as an anode and connected with the positive pole of a direct current power supply, the graphite rod is used as a cathode and connected with the negative pole of the direct current power supply, and the graphite rod is immersed in a sodium hydroxide solution. And turning on a power supply, and carrying out anodic oxidation treatment on the regenerated carbon fibers for 15 minutes by using a voltage of 3V, taking out the carbon fibers after the oxidation process is finished, leaching the carbon fibers with water for four times, and then hanging the carbon fibers at room temperature of 24 ℃ for drying for 24 hours to obtain the surface modified regenerated carbon fiber fabric.
Step 1: preparing the modified regenerated carbon fiber chopped fiber.
And cutting the surface modified regenerated carbon fiber fabric for 60 seconds at room temperature by using a rotary cutting machine, and collecting short fibers after cutting to obtain the modified regenerated carbon fiber chopped fibers.
Step 2: preparing the modified regenerated carbon fiber reinforced alkali-activated composite material.
Step 2.1: mixing the low-calcium fly ash, the granulated blast furnace slag and the sodium silicate according to the mass ratio of 49.
Step 2.2: and (3) adding the modified regenerated carbon fiber chopped fibers prepared in the step (1) into the mixed dry material prepared in the step (2.1). The ratio of the total dry weight of the modified regenerated carbon fiber chopped fibers to the dry weight of the alkali-activated composite material in the step 2.1 is 0.65:100. mixing and stirring uniformly.
Step 2.3: according to the ratio of water to the alkali-activated material dry material of 0.3:1, adding water and stirring for 3 minutes, pouring slurry of an alkali-activated material into a mold for shaping, shaking for 1 minute to remove bubbles, sealing the mold with a PVA plastic bag, curing for 24 hours, then demolding, putting the taken modified regenerated carbon fiber alkali-activated composite material test piece into the PVA plastic bag again, continuing sealing and curing under the constant temperature condition of 24 ℃, and detecting the strength until the age of 28 days.
Comparative example 1
The difference from the examples 1-2 is that no common regenerated carbon fiber chopped fiber is added, and the specific proportion of each component is shown in the table 2.
Comparative example 2
The difference from examples 3 to 4 is that ordinary regenerated carbon fiber chopped fibers were not added. The difference between the comparative example 2 and the comparative example 1 is that the amount of water is different, and the specific ratio of each component is shown in table 2.
The regenerated carbon fiber reinforced fly ash-based alkali-activated materials obtained in examples 1 to 5 and the composite materials obtained in comparative examples 1 to 2 were subjected to flexural and compressive strength tests, wherein the concrete curing time was 28 days, and the test results are shown in table 3, wherein the fracture energy was calculated from the force-displacement curve of the three-point bending test, and used for characterizing the toughness and ductility of the materials.
TABLE 3 flexural and compressive strength test results
| Flexural strength | Energy at break | Compressive strength | |
| (MPa) | (N/m) | (MPa) | |
| Example 1 | 6.06 | 175.55 | 43.81 |
| Example 2 | 7.21 | 427.63 | 42.85 |
| Example 3 | 7.99 | 188.11 | 65.06 |
| Example 4 | 9.65 | 534.59 | 67.57 |
| Example 5 | 10.64 | 560.66 | 65.64 |
| Comparative example 1 | 6.61 | 116.43 | 43.24 |
| Comparative example 2 | 8.94 | 167.90 | 54.08 |
The reinforced fly ash-based alkali-activated materials obtained in examples 1 to 5 and the composite materials obtained in comparative examples 1 to 2 were analyzed in terms of mechanical properties, principle, and the like.
Referring to table 3, comparative examples 1 to 2 are alkali-activated composite materials without adding regenerated carbon fiber according to the results of mechanical strength test. The flexural strength and compressive strength of comparative example 2 were both greater than those of comparative example 1 because the mass fraction of water was reduced, resulting in a reduced porosity, and the structure of the alkali-activated composite material became denser, resulting in greater flexural and compressive strengths and higher fracture energy when the alkali-activated material was subjected to an external force.
The compressive strength of examples 1 and 2 was substantially the same as that of comparative example 1, indicating that the addition of untreated regenerated carbon fiber provides little improvement in compressive strength over comparative example 1. Compared with the comparative example 1, the flexural strength of the example 1 is slightly reduced, which shows that the addition of a small amount of regenerated carbon fiber in the example 1 has a reducing effect on the flexural strength of the comparative example 1; however, the fracture energy of example 1 was significantly increased compared to comparative example 1, indicating that the addition of a small amount of regenerated carbon fiber to example 1 has an increasing effect on the bending toughness of comparative example 1. In addition, as the addition content of the regenerated carbon fiber is increased, the flexural strength and the fracture energy of example 2 are increased compared with those of comparative example 1, which shows that optimizing the incorporation content of the regenerated carbon fiber can effectively increase the flexural strength of comparative example 1 while greatly increasing the bending toughness.
The compressive strength of both example 3 and example 4 is greater than that of comparative example 2, and the compressive strength of example 4 is greater than that of example 3, which shows that the compressive strength of comparative example 2 is greatly improved by adding the untreated regenerated carbon fiber, and the improvement of the compressive strength increases with the increase of the doping content of the regenerated carbon fiber. In contrast, the flexural strength of example 3 is slightly decreased and the fracture energy is increased compared to comparative example 2, which shows that the addition of a small amount of regenerated carbon fibers in example 3 has a decreasing effect on the flexural strength of comparative example 2 and an increasing effect on the toughness of the material. In addition, as the addition content of the regenerated carbon fiber is increased, the flexural strength and the fracture energy of example 4 are increased compared with those of comparative example 2, which shows that the flexural strength and the toughness of comparative example 2 can be effectively improved by optimizing the incorporation content of the regenerated carbon fiber.
Compared with the examples 1 and 2, the compression strength of the examples 3 and 4 is increased to a greater extent, which shows that the compression strength of the low-water-gel-ratio alkali-activated material can be effectively improved by adding the untreated regenerated carbon fiber. In addition, compared with the embodiments 1 and 2, the matrix structure of the embodiments 3 and 4 is more compact, so that the connection strength of the regenerated carbon fiber and the alkali-activated material matrix is improved, and the mechanical transmission between the regenerated carbon fiber and the alkali-activated material matrix is optimized. When the alkali-activated composite material is subjected to an external force, the regenerated carbon fibers can more effectively control the development of cracks and improve the compressive strength.
Compared with example 4, the compressive strength of example 5 is basically the same, which shows that the regenerated carbon fiber surface modification treatment technology has limited improvement on the compressive strength, the rupture strength and the fracture energy of example 5 are larger, and the regenerated carbon fiber surface modification treatment technology can effectively improve the rupture strength of the alkali-activated material and the energy dissipation during bending fracture. The surface modification treatment technology removes loose carbon impurities on the surface of the regenerated carbon fiber, as shown in fig. 1-2, introduces oxygen-containing functional groups on the surface of the regenerated carbon fiber, increases the wettability of the surface of the fiber, enables an N-A-S-H gel structure to be generated on the surface of the regenerated carbon fiber, optimizes the interface areA of the regenerated carbon fiber and the alkali-activated material, and as shown in fig. 3, shows that the mechanical transfer efficiency between the regenerated carbon fiber and the alkali-activated material is improved by the surface modification treatment of the regenerated carbon fiber.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The above-described preferred features may be used in any combination without conflict with each other.
Claims (8)
1. A reinforced fly ash based alkali-activated material, comprising: the production method comprises the following steps of (1) regenerating carbon fiber chopped fibers and alkali-activated material dry materials, wherein the regenerating carbon fiber chopped fibers are modified regenerating carbon fiber chopped fibers; the ratio of the total dry weight of the regenerated carbon fiber chopped fibers to the dry weight of the alkali-activated material dry material is (0.32-0.65): 100, respectively;
the reinforced fly ash-based alkali-activated material comprises: 45 parts of low-calcium fly ash, 19 parts of granulated blast furnace slag, 11 parts of sodium silicate dry powder, 0.32 to 0.65 part of regenerated carbon fiber chopped fiber and 24 to 31 parts of water;
the preparation method of the modified regenerated carbon fiber chopped fiber comprises the following steps:
connecting the regenerated carbon fiber serving as an anode with the anode of a direct-current power supply, and immersing the regenerated carbon fiber into a sodium hydroxide solution;
connecting a graphite rod serving as a cathode with a negative electrode of a direct current power supply, and immersing the graphite rod into a sodium hydroxide solution;
turning on a power supply to carry out anodic oxidation treatment on the regenerated carbon fiber, taking out after the oxidation process is finished, washing with water, and then, suspending and drying at room temperature to obtain the surface modified regenerated carbon fiber;
and cutting the surface modified regenerated carbon fiber at room temperature to obtain the modified regenerated carbon fiber chopped fiber.
2. The reinforced fly ash-based alkali-activated material as claimed in claim 1, wherein the mass part ratio of the total dry weight of the modified regenerated carbon fiber chopped fibers to the dry weight of the alkali-activated material dry material is 0.65:100.
3. the reinforced fly ash-based alkali-activated material as claimed in claim 1, wherein the mass fraction of the sodium hydroxide solution is 0.014 to 0.028%.
4. The enhanced fly ash-based alkali-activated material of claim 1, wherein said suspension drying at room temperature after rinsing with water comprises: and (4) washing the mixture for three to five times by using water, and then hanging and drying the mixture for 6 to 24 hours at room temperature.
5. The reinforced fly ash-based alkali-activated material of claim 1, wherein the surface-modified regenerated carbon fiber is cut at room temperature, comprising: and cutting the surface modified regenerated carbon fiber at room temperature by using a rotary cutting machine, and collecting the cut carbon fiber after cutting to obtain the modified regenerated carbon fiber chopped fiber.
6. The reinforced fly ash-based alkali-activated material as claimed in claim 1, wherein the length of the regenerated carbon fiber chopped fiber is 0.1 to 1.2 mm, and the average length is 0.4 to 0.6 mm.
7. A method of preparing an enhanced fly ash based alkali-activated material as claimed in any one of claims 1 to 6, comprising:
mixing and stirring the low-calcium fly ash, the granulated blast furnace slag and the sodium silicate dry powder with the regenerated carbon fiber chopped fiber;
and then adding water and continuously stirring to obtain the reinforced fly ash-based alkali-activated composite material.
8. The method of claim 7, wherein the adding water continues stirring, wherein: the stirring time is 3 to 5 minutes.
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