CN115784687A - Wave-absorbing recycled concrete and preparation method thereof - Google Patents
Wave-absorbing recycled concrete and preparation method thereof Download PDFInfo
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention belongs to the technical field of road materials, and particularly relates to wave-absorbing recycled concrete and a preparation method thereof. The wave-absorbing recycled concrete comprises the following components in parts by weight: 100 to 150 parts of copper slag powder, 700 to 900 parts of fine aggregate, 290 to 420 parts of cement, 110 to 840 parts of modified recycled aggregate, 360 to 990 parts of natural coarse aggregate and 180 to 200 parts of water; the modified recycled aggregate is prepared by modifying recycled aggregate with graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel. The wave-absorbing recycled concrete has good wave-absorbing performance on the basis of meeting service conditions.
Description
Technical Field
The invention belongs to the technical field of road materials, and particularly relates to wave-absorbing recycled concrete and a preparation method thereof.
Background
The cement concrete pavement is one of the main pavement forms in China, and the preparation of the recycled aggregate into the cement concrete has important significance for resource saving and environmental protection in road construction. However, the recycled aggregate can generate more cracks and damages in the service and crushing processes of the previous stage, so that the performance of the prepared cement concrete is reduced, and the large-scale application of the recycled aggregate is limited. Meanwhile, the cement concrete pavement in cold areas of China can generate shrinkage cracks, and the pavement is frozen due to snowfall in winter, so that the driving safety is seriously affected. Therefore, how to apply recycled aggregate on a large scale and quickly and effectively remove accumulated snow on the road surface is an urgent technical problem in recent years.
The reinforcing method for the recycled aggregate mainly comprises a ball milling method and a slurry coating method. The ball milling method is used for placing the recycled aggregate into a ball mill for ball milling so as to remove residual mortar covered on the surface of the aggregate, and the crushing value of the recycled aggregate can be effectively reduced. But the aggregate can generate new cracks in the ball milling process, so that the performance is reduced; the slurry coating method coats the surface of the recycled aggregate with slurry prepared from silica fume and fly ash so as to fill the cracks of the aggregate. However, the fusion of the slurry and the surface of the aggregate is poor, and the slurry covering the surface of the aggregate becomes a new weak area, so that the use of the recycled aggregate is influenced.
The snow and ice removing method includes a removing method and a melting method. The salt spreading method utilizes the action of salt and water to lower the freezing point of water, so that the accumulated snow can be automatically melted. But the salt spreading method can corrode the reinforcing steel bar fiber, so that the pavement is peeled off and damaged; the removing method is low in efficiency because the ice and snow on the road surface are removed by adopting a tool manually. Compared with the traditional deicing method, the thermal deicing method utilizes heat to melt ice and snow. The microwave deicing technology is easy to implement, and has little influence on the road surface and the building surface. When the surface of the coating is frozen, a microwave generating device is used for deicing, microwaves can penetrate through the ice layer to directly heat the wave-absorbing material below, and then the wave-absorbing material heats the ice layer through heat transfer, so that the purposes of melting ice and removing ice are achieved. However, in the process of heating cement concrete by microwave, the microwave heating efficiency is obviously low, and the application and popularization of the microwave heating technology in the field of pavement materials are seriously limited. The reason is that the cement concrete material itself has the defects of low efficiency of microwave heating of the cement concrete pavement material and the like because the cement concrete material does not absorb microwaves or absorbs few microwaves, and the cement concrete material is a poor conductor of heat.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide wave-absorbing recycled concrete and a preparation method thereof, and aims to solve or improve the problem of low efficiency of microwave heating cement concrete pavement materials in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme: the wave-absorbing recycled concrete comprises the following components in parts by weight: 100 to 150 parts of copper slag powder, 700 to 900 parts of fine aggregate, 290 to 420 parts of cement, 110 to 840 parts of modified recycled aggregate, 360 to 990 parts of natural coarse aggregate and 180 to 200 parts of water; the modified recycled aggregate is prepared by modifying recycled aggregate with graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel.
Preferably, the graphene oxide/polyvinyl alcohol/polyacrylamide nanocomposite hydrogel is prepared by a method comprising the following steps: (1) Mixing polyvinyl alcohol, acrylamide and graphene oxide dispersion liquid, and heating until the polyvinyl alcohol and the acrylamide are completely dissolved; (2) And (2) cooling the mixture obtained by the treatment in the step (1) to room temperature, adding nano montmorillonite and ammonium persulfate, heating to 55-65 ℃, and reacting for 8-12h to obtain the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel.
Preferably, in the step (1), the mass ratio of the polyvinyl alcohol to the acrylamide to the graphene oxide dispersion is (1-1.5) to (3-4) to (10-17); in the graphene oxide dispersion liquid, the mass fraction of graphene oxide is 0.15%; the heating temperature was 85. + -. 2 ℃.
Preferably, in the step (2), the mass ratio of the nano montmorillonite to the polyvinyl alcohol is 0.173-0.255%.
Preferably, in the step (2), the mass ratio of the ammonium persulfate to the polyvinyl alcohol is 0.260-0.385%.
Preferably, the modified recycled aggregate is prepared by a method comprising the following steps: (I) Dissolving the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel in deionized water to obtain a graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel solution; (II) soaking the recycled aggregate in the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel aqueous solution, and after soaking, air-drying to obtain the modified recycled aggregate.
Preferably, in the step (I), the mass ratio of the deionized water to the polyvinyl alcohol is (1000-1500): 1; in the step (II), the soaking time is 24 +/-2 h.
Preferably, the particle size of the recycled aggregate is more than 4.75mm.
Preferably, the copper slag powder is water-quenched copper slag powder with the particle size of less than 0.075 mm.
The invention also provides a preparation method of the wave-absorbing recycled concrete, which adopts the following technical scheme: the preparation method of the wave-absorbing recycled concrete comprises the following steps: uniformly mixing the copper slag powder, the fine aggregate, the cement, the modified recycled aggregate and the natural coarse aggregate; and step two, adding water into the uniform mixture obtained by the step one, and uniformly mixing to obtain the wave-absorbing recycled concrete.
Has the advantages that:
in the wave-absorbing recycled concrete, the recycled aggregate is modified, the surface and cracks are covered with the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel, the porosity of the recycled aggregate is obviously reduced, and the performance is improved. The nano composite hydrogel is a three-dimensional network structure, can effectively disperse the stress at the tip of the crack of the aggregate, and avoids the problem that the recycled concrete is frozen and swelled or shrunk and cracked.
And (II) the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel contains graphene oxide, and the graphene oxide has excellent mechanical, electrical and thermal properties. When the hydrogel containing the graphene oxide is filled in the gaps of the recycled aggregate, the graphene oxide can reduce the porosity of the recycled aggregate and improve the mechanical properties of the recycled aggregate by virtue of the volume effect, the surface effect and the filling effect of the graphene oxide in a matrix; meanwhile, the graphene oxide has excellent wave absorption and thermal conductivity, can improve the dielectric constant and thermal conductivity of the recycled concrete, and is beneficial to improving the snow-melting and ice-melting effects of the concrete pavement.
(III) the wave-absorbing recycled concrete material of the invention uses inorganic nano montmorillonite material to bridge hydrogel monomer, the nano montmorillonite is a layered mineral composed of water-containing aluminosilicate, and the aluminosilicate can react with chloride ions to generate Friedel salt, thereby consuming the content of free chloride ions in concrete, improving the compactness of concrete and further enhancing the chloride ion corrosion resistance of concrete.
According to the invention, (IV) the water quenching copper slag is used for replacing part of cement, so that the wave absorption property of the wave-absorbing recycled concrete is improved while the performance of the wave-absorbing recycled concrete meets road conditions, and the wave-absorbing recycled concrete and graphene oxide in the modified material perform double wave-absorbing reinforcing action, so that the wave absorption property of the wave-absorbing recycled concrete is greatly improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a graph showing the results of the 28d microwave reflectivity test of the recycled concrete for absorbing waves in examples 2 to 5 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention provides wave-absorbing recycled concrete aiming at the problem of low efficiency of the existing microwave heating cement concrete pavement material. The wave-absorbing recycled concrete provided by the embodiment of the invention comprises the following components in parts by weight: 100 to 150 parts (e.g., 100 parts, 110 parts, 120 parts, 130 parts, 140 parts, or 150 parts) of copper slag powder, 700 to 900 parts (e.g., 700 parts, 740 parts, 780 parts, 820 parts, 860 parts, or 900 parts) of fine aggregate, 290 to 420 parts (e.g., 290 parts, 310 parts, 330 parts, 350 parts, 370 parts, 390 parts, 410 parts, or 420 parts) of cement, 110 to 840 parts (e.g., 110 parts, 230 parts, 350 parts, 450 parts, 550 parts, 650 parts, 750 parts, or 840 parts) of modified recycled aggregate, 360 to 990 parts (e.g., 360 parts, 460 parts, 560 parts, 660 parts, 780 parts, 880 parts, or 990 parts) of natural coarse aggregate, and 180 to 200 parts (e.g., 180 parts, 185 parts, 190 parts, 195 parts, or 200 parts) of water; the modified recycled aggregate is prepared by modifying recycled aggregate with graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel.
The regenerated aggregate is modified by adopting the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel, the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel covers the surface and in cracks of the regenerated aggregate, the porosity of the regenerated aggregate is obviously reduced, and the performance is improved.
The graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel is an organic cross-linked high polymer material, a polyacrylamide network formed by chemical cross-linking has higher stretchability, and carries a large number of acylamino, so that a large number of hydroxyl groups carried on a polyvinyl alcohol chain can form a large number of reversible hydrogen bonds with the acylamino, and after the hydrogel is damaged by external force, the dynamic reversible hydrogen bonds are recovered, so that the self-healing of the composite hydrogel is realized, and the crack resistance of the recycled aggregate is improved. In addition, a large number of free hydroxyl groups of the polyvinyl alcohol can realize the adhesion effect on various interfaces, fill cracks and gaps of the recycled aggregate and improve the performance of the recycled aggregate.
The graphene oxide has excellent mechanical, electrical and thermal properties. When the hydrogel containing the graphene oxide is filled in gaps of the recycled aggregate, the graphene oxide can reduce the porosity of the recycled aggregate and improve the mechanical properties of the recycled aggregate by virtue of the volume effect, the surface effect and the filling effect of the graphene oxide in a matrix; meanwhile, the graphene oxide has excellent wave absorption and thermal conductivity, can improve the dielectric constant and thermal conductivity of the recycled concrete, and is beneficial to the snow and ice melting effects of the recycled concrete pavement.
By adding nano-montmorillonite which is a layered mineral composed of water-containing aluminosilicate, an inorganic nano-montmorillonite material bridges the graphene oxide/polyvinyl alcohol/polyacrylamide nano-composite hydrogel monomer, the aluminosilicate can react with chloride ions to generate Friedel salt, so that the free chloride ion content in concrete is consumed, and the chloride ion corrosion resistance of the concrete is further enhanced.
In the preferred embodiment of the wave-absorbing recycled concrete, the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel is prepared by adopting a method comprising the following steps: (1) Mixing polyvinyl alcohol, acrylamide and graphene oxide dispersion liquid, and heating until the polyvinyl alcohol and the acrylamide are completely dissolved; (2) And (2) cooling the mixture obtained by the treatment in the step (1) to room temperature, adding nano-montmorillonite and ammonium persulfate, heating to 55-65 ℃ (for example, 55 ℃, 58 ℃,60 ℃, 62 ℃ or 65 ℃) and reacting for 8-12h (for example, 8h, 9h, 10h, 11h or 12 h) to obtain the graphene oxide/polyvinyl alcohol/polyacrylamide nano-composite hydrogel.
In a preferred embodiment of the wave-absorbing recycled concrete of the invention, in the step (1), the mass ratio of the polyvinyl alcohol, the acrylamide and the graphene oxide dispersion is (1-1.5) to (3-4) to (10-17) (for example, the mass ratio of the polyvinyl alcohol, the acrylamide and the graphene oxide dispersion is 1;
in the graphene oxide dispersion liquid, the mass fraction of graphene oxide is 0.15%; the heating temperature is 85 + -2 deg.C (e.g., 83 deg.C, 84 deg.C, 85 deg.C, 86 deg.C, or 87 deg.C).
In a preferred embodiment of the wave-absorbing recycled concrete of the invention, in the step (2), the mass ratio of the nano-montmorillonite to the polyvinyl alcohol is 0.173% -0.255% (e.g., 0.173%, 0.185%, 0.195%, 0.205%, 0.215%, 0.225%, 0.235%, 0.245% or 0.255%).
In a preferred embodiment of the wave-absorbing recycled concrete of the present invention, in the step (2), the mass ratio of ammonium persulfate to polyvinyl alcohol is 0.260% to 0.385% (e.g., 0.260%, 0.28%, 0.30%, 0.32%, 0.34%, 0.36%, 0.38%, or 0.385%). The ratio of each substance is required to be within a predetermined range, and if the ratio exceeds the predetermined range, the gel produced may be excessively crosslinked or not crosslinked, and the recycled aggregate cannot be modified.
In the preferred embodiment of the wave-absorbing recycled concrete, the modified recycled aggregate is prepared by adopting the method comprising the following steps:
(I) Dissolving graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel in deionized water to obtain a graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel solution;
(II) soaking the recycled aggregate in the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel aqueous solution, and after soaking, air-drying to obtain the modified recycled aggregate.
In the preferred embodiment of the wave-absorbing recycled concrete of the invention, in the step (I), the mass ratio of the deionized water to the polyvinyl alcohol is (1000-1500) 1 (for example, 1000; in step (II), the soaking time is 24 ± 2h (e.g., 22h, 23h, 24h, 25h, or 26 h). If the soaking time is too short, the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel cannot be soaked in the regenerated aggregate cracks, so that the modification effect of the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel on the regenerated aggregate is influenced.
In the preferred embodiment of the wave-absorbing recycled concrete, the particle size of the recycled aggregate is more than 4.75mm. Namely, the modified recycled aggregate adopted by the invention is modified recycled coarse aggregate
In the preferred embodiment of the wave-absorbing recycled concrete, the copper slag powder is water-quenched copper slag powder with the particle size of less than 0.075 mm. By adopting the water quenching copper slag to replace part of cement, the wave absorption performance of the recycled concrete can be improved while the performance of the recycled concrete meets the road condition, the dual wave absorption strengthening effect is carried out with the graphene oxide in the modified recycled aggregate, and the wave absorption performance of the recycled concrete is improved to a great extent.
The invention also provides a preparation method of the wave-absorbing recycled concrete, which comprises the following steps: uniformly mixing copper slag powder, fine aggregate, cement, modified recycled aggregate and natural coarse aggregate; and step two, adding water into the uniform mixture obtained by the step one, and uniformly mixing to obtain the wave-absorbing recycled concrete.
The following describes the wave-absorbing recycled concrete and the preparation method thereof in detail through specific embodiments.
The following examples: the tap density of the graphene oxide is 270g/L; the polyvinyl alcohol is provided by national drug group chemical reagent, inc., and has a molecular formula of [ -CH ] 2 CHOH-]n/(C 2 H 4 O) n; acrylamide is provided by national chemical reagent group, inc., and has a molecular formula of C 3 H 5 NO. The cement is P.O 42.5 grade cement; the fine aggregate is river sand with fineness modulus of 2.5. The natural aggregate is 5-25 mm continuous graded limestone macadam, and the crushing value is 9.6; the recycled aggregate is waste concrete from strength C30 and C40, the used broken stone is limestone, and the crushing value is 14.5.
Example 1
The preparation method of the modified recycled aggregate comprises the following steps:
(1) Ultrasonically dispersing 0.015 part by mass of graphene oxide in 10 parts by mass of deionized water to obtain a graphene oxide dispersion liquid;
(2) Adding 1.5 parts by mass of polyvinyl alcohol and 3.5 parts by mass of acrylamide to the graphene oxide dispersion liquid obtained in step (1), and heating the mixture at 85 ℃ until the polyvinyl alcohol and the acrylamide are completely dissolved;
(3) Cooling the mixture obtained by the treatment in the step (2) to room temperature, adding 0.0026 parts by mass of nano montmorillonite and 0.0039 parts by mass of ammonium persulfate, and reacting at 60 ℃ for 10 hours to obtain graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel;
(4) Mechanically stirring and dissolving the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel obtained by the reaction in the step (3) in 1000 parts by mass of deionized water to obtain a graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel solution;
(5) And (3) soaking the recycled aggregate (the particle size is larger than 4.75 mm) in the graphene/polyvinyl alcohol/polyacrylamide nano composite hydrogel aqueous solution obtained by the treatment in the step (4) for 24 hours, and naturally drying after soaking to obtain the modified recycled aggregate (modified recycled coarse aggregate) in the embodiment.
Example 2
The wave-absorbing recycled concrete of this embodiment, with unilateral (one cubic meter) quality meter, includes: 120 parts of copper slag powder, 700 parts of fine aggregate, 320 parts of cement, 840 parts of modified regenerated coarse aggregate (prepared in example 1), 360 parts of natural coarse aggregate and 180 parts of water.
The preparation method of the wave-absorbing recycled concrete comprises the following steps:
the method comprises the following steps: weighing steel slag powder, fine aggregate, cement, modified recycled coarse aggregate, natural coarse aggregate and water according to the mass parts;
step two: mixing and stirring the steel slag powder, the fine aggregate, the cement, the modified recycled coarse aggregate and the natural coarse aggregate uniformly;
step three: and (4) adding water into the mixture obtained in the second step, and uniformly mixing to obtain the wave-absorbing recycled concrete of the embodiment.
Example 3
The wave-absorbing recycled concrete of this embodiment, with unilateral (one cubic meter) quality, includes: 100 parts of copper slag powder, 750 parts of fine aggregate, 340 parts of cement, 600 parts of modified recycled coarse aggregate (prepared in example 1), 600 parts of natural coarse aggregate and 185 parts of water.
The preparation method of the wave-absorbing recycled concrete of the embodiment is the same as that of the embodiment 2.
Example 4
The wave-absorbing recycled concrete of this embodiment, with unilateral (one cubic meter) quality meter, includes: 130 parts of copper slag powder, 800 parts of fine aggregate, 310 parts of cement, 300 parts of modified recycled coarse aggregate (prepared in example 1), 900 parts of natural coarse aggregate and 190 parts of water.
The preparation method of the wave-absorbing recycled concrete of the embodiment is the same as that of the embodiment 2.
Example 5
The wave-absorbing recycled concrete of this embodiment, with unilateral (one cubic meter) quality meter, includes: 150 parts of copper slag powder, 900 parts of fine aggregate, 290 parts of cement, 110 parts of modified recycled coarse aggregate (prepared in example 1), 990 parts of natural coarse aggregate and 200 parts of water.
The preparation method of the wave-absorbing recycled concrete of the embodiment is the same as that of the embodiment 2.
Comparative example 1
The wave-absorbing recycled concrete of this comparison example to the unilateral quality includes: 700 parts of fine aggregate, 420 parts of cement, 840 parts of modified recycled coarse aggregate (prepared in example 1), 360 parts of natural coarse aggregate and 180 parts of water.
The preparation method of the wave-absorbing recycled concrete of the comparative example is the same as that of example 2.
Comparative example 2
The wave-absorbing recycled concrete of this comparative example to the folk prescription quality includes: 120 parts of copper slag powder, 700 parts of fine aggregate, 320 parts of cement, 840 parts of modified recycled coarse aggregate (the recycled aggregate is not modified by the method of the invention), 360 parts of natural coarse aggregate and 180 parts of water.
The preparation method of the wave-absorbing recycled concrete of the comparative example is the same as that of example 2.
Comparative example 3
The nanocomposite hydrogel of this comparative example differs from example 1 only in that: the raw materials for preparing the recycled aggregate modified hydrogel do not contain graphene oxide (the graphene oxide dispersion liquid in the step (2) in the example 1 is replaced by equivalent deionized water), and the rest is consistent with that in the example 1; after the treatment of the step (3), the nanocomposite hydrogel (polyvinyl alcohol/polyacrylamide nanocomposite hydrogel) of the comparative example 3 was obtained.
Thereafter, the nanocomposite hydrogel (polyvinyl alcohol/polyacrylamide nanocomposite hydrogel) of comparative example 3 and recycled aggregate were treated in the same manner as in steps (4) to (5) of example 1, to obtain a modified recycled aggregate of comparative example 3.
The recycled concrete of this comparative example (comparative example 3) differs from example 2 only in that: the modified recycled aggregate of comparative example 3 was used in place of the modified recycled aggregate of example 2, and the remainder was the same as in example 2; the recycled concrete of this comparative example was obtained.
Comparative example 4
The nanocomposite hydrogel of this comparative example differs from example 1 only in that: in step (3), the same amount of acrylic acid was used instead of the nano-montmorillonite bridging hydrogel monomer, and the rest was the same as in example 1. And (4) after the treatment in the step (3), obtaining the nano composite hydrogel (acrylic acid-graphene polyvinyl alcohol/polyacrylamide nano composite hydrogel) in the comparative example 4.
Thereafter, the nanocomposite hydrogel (acrylic acid-graphene oxide/polyvinyl alcohol/polyacrylamide nanocomposite hydrogel) of comparative example 4 and recycled aggregate were treated in the same manner as in steps (4) to (5) of example 1, to obtain a modified recycled aggregate of comparative example 4.
The recycled concrete of this comparative example (comparative example 4) differs from example 2 only in that: the modified recycled aggregate of comparative example 4 was used in place of the modified recycled aggregate of example 2, and the remainder was the same as in example 2; the recycled concrete of this comparative example was obtained.
Examples of the experiments
1. The concrete samples of examples 2 to 5 and comparative examples 1 to 4 were tested for compressive strength, tensile strength at cleavage and abrasion resistance according to the test rules for road engineering cement and cement concrete (JTG 3420-2020); the reflectivity of the test pieces of examples and comparative examples was measured by the bow reflex (NRL) method, and the results are shown in table 1, table 2, and fig. 1, respectively.
TABLE 1 concrete test piece 28d compressive strength
As can be seen from Table 1: the compressive strength of the recycled concrete increased with the addition of the natural aggregate, and the compressive strength of example 5 was the highest. The coarse aggregate of comparative example 2 was not modified with the nanocomposite hydrogel, and thus its compressive strength was lower than that of example 2, comparative example 3, and comparative example 4.
TABLE 2 concrete specimen 28d cleavage tensile strength
| Concrete test piece | Splitting compressive strength (MPa) |
| Example 2 | 2.879 |
| Example 3 | 3.071 |
| Example 4 | 3.244 |
| Example 5 | 3.473 |
| Comparative example 1 | 2.933 |
| Comparative example2 | 2.687 |
| Comparative example 3 | 2.886 |
| Comparative example 4 | 2.873 |
As can be seen from Table 2: the splitting tensile strength of the recycled concrete is also increased along with the increase of the mixing amount of the natural aggregate, and the splitting tensile strength of the recycled concrete prepared by using the recycled aggregate modified by the nano-composite hydrogel (example 2, comparative example 3 and comparative example 4) is higher than that of the recycled concrete prepared by using the unmodified recycled aggregate (comparative example 2).
The results of testing the microwave reflectivity of the concrete samples 28d of the different examples and comparative examples are shown in FIG. 1:
as can be seen from the graph 1, the frequency is in the range of 3 GHz-16 GHz, the reflection loss peak value of the wave-absorbing recycled concrete in the embodiment 2 is the largest, which shows that the microwave absorption capacity of the wave-absorbing recycled concrete in the embodiment 2 is the best, and the wave absorption of the cement concrete is increased by the copper slag and the modified aggregate. In the concrete of comparative example 1, the copper slag content is 0, so that the reflection loss peak value is lower than that of example 2; however, since the content of the modified recycled aggregate is the largest in comparative example 1, the content of graphene oxide in the cement concrete is the highest, and the reflectance peak value of the graphene oxide at about 5.2GHz is larger, which shows that the graphene oxide can improve the wave absorption of the cement concrete. In the concrete of comparative example 2, the amount of copper dross was the same as in example 1, but the aggregate was not reinforced with the graphene oxide/polyvinyl alcohol/polyacrylamide nanocomposite hydrogel, and thus the peak reflectance was the lowest at around 5.2 GHz. The composite hydrogel in comparative example 3 does not contain graphene oxide, and therefore its wave absorption is slightly lower than that of example 2. The reflection loss of comparative example 4 is comparable to that of example 2, indicating that nano-montmorillonite has no significant effect on the concrete's wave absorption.
2. The chloride ion adsorption amounts of the graphene oxide/polyvinyl alcohol/polyacrylamide nanocomposite hydrogel of example 1 (the product obtained by the treatment of step (3) in example 1) and the nanocomposite hydrogels of comparative examples 3 to 4 were measured:
preparing 0.1mol/L NaCl solution, weighing 1g of nano composite hydrogel sample, dissolving in 50mL NaCl solution, placing the beaker in a constant temperature water bath stirring pot at room temperature, stirring for reaction, and timing. In order to prevent the interference of external ions in the laboratory environment, the pH value of the solution is controlled by the prepared dilute nitric acid solution and sodium hydroxide solution. And absorbing 5mL of solution every 30min by using a pipette during stirring, extracting the upper suspension after high-speed separation by using a centrifuge, carrying out chloride ion titration on the suspension by using a potentiometric titrator until the concentration of chloride ions is unchanged, stopping titration, and recording real-time data, wherein the test result is shown in Table 3.
TABLE 3 chloride ion adsorption Capacity test results
| Example 1 | Comparative example 3 | Comparative example 4 | |
| Chloride ion adsorption per unit mass (mg/g) | 31.45 | 31.95 | 13.67 |
Table 3 shows the chloride ion adsorption capacity test results of the nanocomposite hydrogel, and it can be seen that the graphene oxide/polyvinyl alcohol/polyacrylamide nanocomposite hydrogel of example 1 has the strongest chloride ion adsorption capacity; the chloride ion adsorption capacity of the nanocomposite hydrogel of comparative example 3 was comparable to the results of example 1; the nanocomposite hydrogel of comparative example 4 had the weakest chloride ion adsorption capacity. The hydrogel is a porous material and has certain physical adsorption capacity to ions, but aluminosilicate contained in the nano montmorillonite can chemically react with chloride ions to further enhance the adsorption of external free chloride ions, so that the nano composite hydrogel of comparative example 4 which does not contain nano montmorillonite has the weakest capacity of adsorbing chloride ions.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The wave-absorbing recycled concrete is characterized by comprising the following components in parts by weight: 100 to 150 parts of copper slag powder, 700 to 900 parts of fine aggregate, 290 to 420 parts of cement, 110 to 840 parts of modified recycled aggregate, 360 to 990 parts of natural coarse aggregate and 180 to 200 parts of water;
the modified recycled aggregate is prepared by modifying recycled aggregate with graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel.
2. The wave-absorbing recycled concrete according to claim 1, wherein the graphene oxide/polyvinyl alcohol/polyacrylamide nanocomposite hydrogel is prepared by a method comprising the following steps:
(1) Mixing polyvinyl alcohol, acrylamide and graphene oxide dispersion liquid, and heating until the polyvinyl alcohol and the acrylamide are completely dissolved;
(2) And (2) cooling the mixture obtained by the treatment in the step (1) to room temperature, adding nano montmorillonite and ammonium persulfate, heating to 55-65 ℃, and reacting for 8-12h to obtain the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel.
3. The wave-absorbing recycled concrete of claim 2, wherein in the step (1), the mass ratio of the polyvinyl alcohol to the acrylamide to the graphene oxide dispersion is (1-1.5) to (3-4) to (10-17);
in the graphene oxide dispersion liquid, the mass fraction of graphene oxide is 0.15%; the heating temperature was 85. + -. 2 ℃.
4. The wave-absorbing recycled concrete according to claim 2, wherein in the step (2), the mass ratio of the nano-montmorillonite to the polyvinyl alcohol is 0.173-0.255%.
5. The wave-absorbing recycled concrete according to claim 2, wherein in the step (2), the mass ratio of the ammonium persulfate to the polyvinyl alcohol is 0.260-0.385%.
6. The wave-absorbing recycled concrete according to claim 2, wherein the modified recycled aggregate is prepared by a method comprising the following steps:
(I) Dissolving the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel in deionized water to obtain a graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel solution;
(II) soaking the recycled aggregate in the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel aqueous solution, and after soaking, air-drying to obtain the modified recycled aggregate.
7. The wave-absorbing recycled concrete according to claim 6, wherein in the step (I), the mass ratio of the deionized water to the polyvinyl alcohol is (1000-1500): 1;
in the step (II), the soaking time is 24 +/-2 h.
8. The wave-absorbing recycled concrete of claim 6, wherein the recycled aggregate has a particle size of greater than 4.75mm.
9. The wave-absorbing recycled concrete according to any one of claims 1 to 8, wherein the copper slag powder is water-quenched copper slag powder with the particle size of less than 0.075 mm.
10. The preparation method of the wave-absorbing recycled concrete according to any one of claims 1 to 9, characterized by comprising the following steps:
uniformly mixing the copper slag powder, the fine aggregate, the cement, the modified recycled aggregate and the natural coarse aggregate;
and step two, adding water into the uniform mixture obtained by the step one, and uniformly mixing to obtain the wave-absorbing recycled concrete.
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