CN116003040B - High-performance cement-based composite material containing reduced graphene oxide coated sand and preparation method thereof - Google Patents
High-performance cement-based composite material containing reduced graphene oxide coated sand and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of building materials, and relates to a high-performance cement-based composite material containing reduced graphene oxide coated sand and a preparation method thereof. According to the method, the surface modification is carried out on the fine aggregate by using the surface modification solution, the strong adhesion capability of dopamine hydrochloride is utilized, a layer of polydopamine layer is generated on the surface of the fine aggregate by self-polymerization, the polydopamine firmly adheres the reduced graphene oxide to the surface of the polydopamine layer due to the synergistic effect of covalent bonds and non-covalent bonds, the high-quality graphene coated sand is prepared, adverse effects caused by poor dispersibility when the high-quality graphene coated sand is directly doped into a cement matrix are avoided, and meanwhile, an excellent conductive path is built in the cement-based composite material, so that the multifunctional conductive cement-based composite material is obtained. The preparation method has the advantages of low preparation cost and short preparation time, and the prepared cement-based composite material has the characteristics of high performance, high conductivity and intelligence, is convenient to realize large-scale popularization and use, and has higher engineering applicability.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a high-performance cement-based composite material containing reduced graphene oxide coated sand and a preparation method thereof.
Background
Cement-based materials are widely used in civil engineering such as houses, bridges, roads, airports, tunnels, and the like due to their mature production process, good plasticity, good integrity, and cost advantages. However, the conventional cement-based materials have the defects of high brittleness, easiness in cracking, low tensile strength, poor durability and the like in the use process. Meanwhile, along with the rapid development and great promotion of town of social economy in China, the cement-based materials gradually develop towards an intelligent direction, and the multifunctionality of the cement-based materials is beneficial to improving the reliability and the safety of the structure and the maintenance cost in the life cycle, and has important economic and environmental values.
In recent decades, scientists around the world have conducted various forms of research to achieve the goal of improving the high performance and versatility of cement-based materials. Mode one: the addition of the fiber (such as carbon fiber, steel fiber, polymer fiber, glass fiber and the like) blocks large cracks in the cement-based material, so that the strength and toughness of the cement-based material are improved macroscopically, but the improvement of the performance is derived from the fiber, and the doping of the fiber cannot inhibit the crack growth from the nano scale, so that the nano-scale brittleness and cracking still exist. Mode two: the nano material is added, the aspect ratio of the zero-dimensional nano material (such as carbon black) is low, the development of nano cracks in the cement-based material to microcracks is difficult to be inhibited, and the reinforcing effect of the nano cracks on the cement-based material is restricted; one-dimensional nanomaterials, e.g. carbon nanotubes, are formed from carbon atoms in sp 2 The tubular structure formed by hybridization bonding has excellent mechanical property and electrical property, has stronger van der Waals force action with hydration products, but has poor dispersibility and easy caking in a cement matrix due to strong intermolecular force, and has limited promotion effect on cement-based properties; the two-dimensional nano material (such as graphene, graphene oxide and the like) has ultrahigh specific surface area and excellent mechanical, electrical and thermal properties, and can endow the cement-based material with certain functionality, but the graphene sheets have stronger van der Waals force and pi-pi stacking effect, so that the graphene sheets are easy to agglomerate; although a lot of hydrophilic oxygen-containing functional groups are introduced into the surface of graphene oxide, strong van der Waals force still exists between the lamellar layers, and the oxygen-containing of the surface is carried out in the high-calcium and high-alkaline environment of the cement-based materialThe functional group will also react with Ca 2+ Complexing occurs with coagulation, and the dispersion of the carbon nanomaterial in various complex cement pore solutions is difficult, so that the performance of the cement-based composite material is improved only to a limited extent.
Chinese patent publication No. CN106517215a discloses a method for preparing graphene completely coated silica nanoparticles. Adding a proper amount of silane coupling agent into the solution containing silicon dioxide to enable the silane coupling agent to be attached to the surfaces of the silicon dioxide particles; then adding graphene oxide into the modified silicon dioxide solution, and completely coating the graphene oxide on the surfaces of the silicon dioxide particles by utilizing the interaction of functional groups; and finally, adding a reducing agent into the solution, and further removing oxygen-containing functional groups of the graphene oxide to form graphene, so as to prepare the composite material with the graphene completely coated with the silicon dioxide. According to the method, although the silane coupling agent is utilized to promote the graphene oxide to be coated on the surface of the silicon dioxide particles, the coating effect of the subsequent graphene is directly affected by the modification effect of the silane coupling agent, the problems of falling off failure and the like in the subsequent application exist, and the preparation process is complex.
Chinese patent publication No. CN114956638A discloses a conductive homogeneous sand and a method for preparing the same. The preparation method realizes the electric conduction of the sand grains by modifying the nano coating on the surface of the sand grains. And optimizing the form of the graphene-coated silica particles by utilizing a heat treatment procedure and regulating and controlling the heat treatment temperature, so as to optimize the conductivity of the conductive sand grains.
Chinese patent publication No. CN114455874a discloses a method for preparing conductive aggregate and application thereof. According to the preparation method, calcium ions are grafted on the surface of the fine aggregate, so that the fine aggregate with positive charges can spontaneously generate adsorption action with graphene oxide with negative potential on the surface, and the fine aggregate with the graphene oxide coated on the surface is obtained by continuous mixing under the heating condition; and carrying out high-temperature reduction treatment and microwave reduction treatment on the graphene oxide, and carrying out in-situ reduction on the graphene oxide to obtain graphene coated aggregate. Both methods improve the dispersibility of graphene in a cement matrix, and obtain the cement-based composite material with excellent conductivity. Because high-temperature heating treatment is used in the preparation process, the production cost is increased, and the continuous high temperature can adversely affect the fine aggregate performance, so that the mechanical property of the cement-based composite material is reduced.
Based on this, there is a need to develop a low cost, high efficiency strategy to produce high performance, high conductivity cement-based composites.
Disclosure of Invention
The invention aims to solve the problem of difficult dispersion of graphene in a cement matrix, and provides a high-performance cement-based composite material containing reduced graphene oxide coated sand and a preparation method thereof. According to the method, the high-quality graphene coated sand is prepared by utilizing the strong adhesion capability of dopamine hydrochloride and the high conductivity of the reduced graphene oxide, so that adverse effects caused by poor dispersibility of graphene directly doped into a cement matrix are avoided, an excellent conductive path is built in a cement-based composite material, and the cement-based composite material with high performance and high conductivity is obtained and has higher engineering applicability.
In order to achieve the above purpose, the present invention adopts the following technical scheme.
The preparation method of the high-performance cement-based composite material containing the reduced graphene oxide coated sand specifically comprises the following steps:
step 1, pretreatment of fine aggregate: and (3) washing the fine aggregate with water to remove surface impurities, and then adding the washed fine aggregate into 0.5M sodium hydroxide solution for soaking.
Step 2, preparing a surface modification solution: dissolving tris (hydroxymethyl) aminomethane in deionized water at 25 ℃, adjusting the pH value of the solution by using 0.1M hydrochloric acid solution, adding dopamine hydrochloride into the solution to dissolve, and stirring to obtain the surface modification solution.
Step 3, fine aggregate surface modification: adding the pretreated fine aggregate in the step 1 into the surface modification solution in the step 2, stirring, then placing the fine aggregate in a microwave oven for microwave heating, taking out the fine aggregate, cooling to room temperature, washing off the surface modification solution which is not loaded on the surface of the fine aggregate by deionized water, and then placing the fine aggregate in an oven for drying to obtain the surface modified fine aggregate.
Step 4, preparing a reduced graphene oxide solution: mixing Graphene Oxide (GO) powder with deionized water, obtaining uniformly dispersed graphene oxide solution under the auxiliary effects of ultrasonic dispersion and magnetic stirring, keeping the temperature of the Graphene Oxide (GO) solution at 50 ℃, and adding 0.5M sodium hydroxide solution into the graphene oxide solution to continuously stir until the color of the solution is not changed, wherein the obtained solution is the reduced graphene oxide solution.
Step 5, preparing reduced graphene oxide coated sand: mixing the reduced graphene oxide solution in the step 4 with the surface modified fine aggregate in the step 3, continuously stirring under a heating condition to uniformly wrap the reduced graphene oxide on the surface of the fine aggregate, and drying the obtained fine aggregate in an oven for later use to obtain the reduced graphene oxide coated sand.
Step 6, preparing a high-performance cement-based composite material containing reduced graphene oxide coated sand: adding a water reducer into mixing water, uniformly stirring for 90s for standby, sequentially adding cement and reduced graphene oxide coated sand into a stirring pot, stirring for 90s at a low speed, adding an aqueous solution containing the water reducer in the stirring process, standing for 30s, and stirring for 90s at a high speed to obtain a mixture slurry; pouring the mixture slurry into a mould to obtain the high-performance cement-based composite material containing the reduced graphene oxide coated sand.
In the step 1, the fine aggregate is one or a combination of a plurality of river sand, artificial sand or natural sand, and the grain size is 75 mu m-2.36 mm.
Further, in the step 1, the washing times are 3-5 times, and the soaking time is 0.5-3 hours.
Further, in the step 2, the mass volume ratio of the tris (hydroxymethyl) aminomethane, the dopamine hydrochloride and the deionized water is 5-10 g: 0.5-3 g:800 to 1200mL.
Further, in the step 2, the pH is adjusted to 8.5, and the stirring speed is 200-600rmp/min, and the stirring time is 3min.
Further, in the step 3, the mass-volume ratio of the pretreated fine aggregate to the surface modification solution is 50-100 g: 500-800 mL.
Further, in the step 3, the stirring speed is 200-600rmp/min, and the stirring time is 10min.
Further, in step 3, the microwave heating is performed for 2min under the microwave power of 400W.
Further, in the step 3, the drying temperature is 50-80 ℃.
Further, in the step 4, the concentration of the uniformly dispersed graphene oxide solution is 0.1-5 mg/mL.
Further, in step 4, the volume ratio of the sodium hydroxide solution to the graphene oxide solution is: 0.005: 1-0.03: 1.
further, in the step 5, the mass-volume ratio of the surface modified fine aggregate to the reduced graphene oxide solution is 180-220 g: 80-100 ml.
In step 5, heating is performed in a water bath at 40-60 ℃.
In step 5, the drying temperature of the oven is 50-80 ℃ and the drying time is 0.5-24 h.
Further, in the step 6, the mass ratio of the cement to the reduced graphene oxide coated sand is 1: 2-3.
Further, in the step 6, the mass ratio of the mixing water to the cement is 0.4-0.6: 1.
further, in the step 6, the mass of the water reducing agent is 0.1-0.3% of the mass of cement.
Further, in the step 6, the low-speed stirring speed is 140+/-5 r/min.
Further, in the step 6, the high-speed stirring speed is 280+/-10 r/min.
Further, in step 6, the pouring process refers to pouring the mixture slurry into a mold in two layers, and each layer needs to vibrate for 1min in order to ensure sufficient compaction of the material.
Compared with other methods, the invention has the beneficial technical effects that.
1. Aiming at the defects of time and energy consumption, uneven dispersion, limited amount of dispersed graphene and the like of the traditional dispersion method (such as ultrasonic, surfactant, copolymerization, hybridization and the like), the graphene is doped into the cement-based composite material in a mode of coating the surface of sand grains, so that the tiled state of the graphene is ensured to reduce wrinkles, and the performance of the graphene is better exerted. The mode combines the graphene and the fine aggregate together, fundamentally solves the defect that the graphene is easy to agglomerate in a cement system, and effectively avoids adverse effects caused by poor dispersibility when the graphene is directly doped into a cement matrix.
2. When the surface modified fine aggregate is prepared, the formation of the polydopamine coating is greatly promoted by adopting a microwave radiation mode; compared with the traditional long-time (about 18 h) soaking mode, the microwave heating can quickly promote the high-speed movement of molecules in a short time so as to achieve the purpose of improving the reaction rate, and the preparation time and the cost of industrial application are reduced.
3. According to the invention, the surface modification is carried out by the surface modification liquid, the strong adhesion capability of dopamine hydrochloride is utilized, a polydopamine layer is generated on the surface of the fine aggregate by self-polymerization, and the polydopamine can firmly adhere graphene on the surface of the polydopamine layer due to the synergistic effect of covalent bonds and non-covalent bonds; the large specific surface area and the surface partial functional groups of the graphene and polydopamine on the surface of the fine aggregate are utilized to promote the generation of cement hydration products, improve the interface transition area between the hydration products and the fine aggregate, reduce the cement consumption, reduce the maintenance cost and reduce the carbon dioxide emission while improving the mechanical property and the durability of the cement-based composite material, and facilitate the development of the traditional cement-based composite material to the high-performance and low-carbonization directions.
4. According to the invention, the graphene oxide is reduced to different degrees by using the sodium hydroxide solution, and the polydopamine coating on the surface of the fine aggregate is combined to prepare the high-quality in-situ reduced graphene oxide coated sand, so that an excellent conductive path is built in the cement-based composite material, and the multifunctional conductive cement-based composite material is obtained.
5. The high-quality graphene coated sand is introduced into the cement-based composite material, so that the cement-based composite material has high strength and high conductivity, can be used for preparing cement-based sensors, and solves the problem of poor modulus adaptability between the conventional cement-based sensors and high-strength or high-performance concrete members; the method can also be used for producing self-sensing cement components and can be used for carrying out reliable damage detection in practical engineering application. Therefore, the invention can be widely popularized in the field of intelligent cement base material preparation.
6. The preparation method has the advantages of low preparation cost and short preparation time, the cohesiveness between the reduced graphene oxide and the fine aggregate is enhanced by utilizing the strong adhesion capability of the dopamine hydrochloride, and the cement-based composite material prepared by the method has the characteristics of high performance and intelligence, and has higher engineering applicability.
Drawings
FIG. 1 is a schematic illustration of the preparation process of a high performance cement-based composite material containing reduced graphene oxide coated sand according to the present invention.
FIG. 2 is a comparative view showing the appearance of reduced graphene oxide coated sand according to example 2 of the present invention and river sand according to comparative example 1; fig. 2 (a) shows river sand, and fig. 2 (b) shows reduced graphene oxide coated sand.
FIG. 3 is a scanning electron microscope comparison chart of reduced graphene oxide coated sand of example 2 of the present invention and river sand of comparative example 1; wherein, fig. 3 (a) is river sand; FIG. 3 (b) is an enlarged view of the river sand square area; FIG. 3 (c) is a reduced graphene oxide coated sand; fig. 3 (d) is an enlarged view of the graphene coated sand square region.
Detailed Description
The following describes the technical solution of the present invention in detail in connection with the embodiments of the present invention so that those skilled in the art may better understand and practice the technical solution of the present invention, but does not limit the present invention to the examples described.
The preparation method of the high-performance cement-based composite material containing the reduced graphene oxide coated sand specifically comprises the following steps:
step 1, pretreatment of fine aggregate: and (3) washing the fine aggregate with the particle size of 75-2.36 mm for 3-5 times, washing off surface impurities, and then adding the washed fine aggregate into a 0.5M sodium hydroxide solution for soaking for 0.5-3 hours.
Step 2, preparing a surface modification solution: dissolving tris (hydroxymethyl) aminomethane in deionized water at 25 ℃, adjusting the pH value to 8.5 by using a 0.1M hydrochloric acid solution, adding dopamine hydrochloride into the solution for dissolution, wherein the mass volume ratio of the tris (hydroxymethyl) aminomethane to the dopamine hydrochloride to the deionized water is 5-10 g: 0.5-3 g: 800-1200 mL, stirring (stirring speed is 200-600rmp/min, stirring time is 3 min) to obtain the surface modification solution.
Step 3, fine aggregate surface modification: adding the pretreated fine aggregate in the step 1 into the surface modification solution in the step 2, wherein the mass-volume ratio is 50-100 g: 500-800 mL, stirring (the stirring speed is 200-600rmp/min, the stirring time is 10 min), then placing the mixture in a microwave oven for microwave heating (microwave power of 400W and heating for 2 min), taking out the mixture, cooling the mixture to room temperature, washing off surface modification solution on the surface of the fine aggregate without load by deionized water, and then placing the mixture in an oven for drying at the drying temperature of 50-80 ℃ to obtain the surface modified fine aggregate.
Step 4, preparing a reduced graphene oxide solution: mixing Graphene Oxide (GO) powder with deionized water, obtaining uniformly dispersed graphene oxide solution (with the concentration of 0.1-5 mg/mL) under the auxiliary effects of ultrasonic dispersion and magnetic stirring, keeping the temperature of the Graphene Oxide (GO) solution at 50 ℃, and adding 0.5M sodium hydroxide solution into the graphene oxide solution until the color of the solution is not changed any more, wherein the volume ratio of the sodium hydroxide solution to the graphene oxide solution is as follows: 0.005: 1-0.03: 1, the obtained solution is the reduced graphene oxide solution.
Step 5, preparing reduced graphene oxide coated sand: mixing the surface modified fine aggregate in the step 3 with the reduced graphene oxide solution in the step 4, wherein the mass volume ratio is 180-220 g: 80-100 ml, continuously stirring under the water bath heating condition of 40-60 ℃ to uniformly wrap the reduced graphene oxide on the surface of the fine aggregate, drying the obtained fine aggregate in an oven for later use, wherein the drying temperature of the oven is 50-80 ℃ and the time is 0.5-24 h, and obtaining the reduced graphene oxide coated sand.
Step 6, preparing a high-performance cement-based composite material containing reduced graphene oxide coated sand: adding a water reducer into mixing water (the mass ratio of the mixing water to the cement is 0.4-0.6:1), uniformly stirring for 90s for standby, sequentially adding cement and reduced graphene oxide coated sand into a stirring pot, wherein the mass ratio of the cement to the reduced graphene oxide coated sand is 1: 2-3, stirring at a low speed (140+/-5 r/min) for 90s, adding an aqueous solution containing a water reducer (the mass of the water reducer is 0.1-0.3% of the mass of cement) in the stirring process, standing for 30s, and stirring at a high speed (280+/-10 r/min) for 90s to obtain a mixture slurry; and pouring the mixture slurry into a mold in two layers, and vibrating each layer for 1min to obtain the high-performance cement-based composite material containing the reduced graphene oxide coated sand.
Example 1.
The preparation method of the high-performance cement-based composite material containing the reduced graphene oxide coated sand comprises the following specific steps:
step 1, pretreatment of fine aggregate:
and (3) washing river sand with the particle size of 75-2.36 mm for 3 times, washing off surface impurities, and then adding the washed fine aggregate into 0.5M sodium hydroxide solution for soaking for 2 hours.
Step 2, preparing a surface modification solution:
8g of tris (hydroxymethyl) aminomethane was dissolved in 1000mL of deionized water at 25℃and pH was adjusted to 8.5 with 0.1M hydrochloric acid solution, and 2g of dopamine hydrochloride was added to the solution to dissolve, and stirred with a magnetic stirrer at a speed of 200-600rmp/min for 3min to obtain a surface-modified solution.
Step 3, fine aggregate surface modification:
adding 100g of pretreated fine aggregate in the step 1 into 600mL of surface modification solution in the step 2, stirring for 10min at a rotating speed of 400rmp/min by adopting a magnetic stirrer, then placing the fine aggregate in a microwave oven, heating for 2min under the microwave power of 400W, taking out the fine aggregate, cooling to room temperature, washing off the surface modification solution on the surface of the fine aggregate without load by deionized water, and then placing the fine aggregate in a 60 ℃ oven for drying to obtain the surface modified fine aggregate.
Step 4, preparing a reduced graphene oxide solution:
mixing graphene oxide powder with deionized water, and obtaining uniformly dispersed graphene oxide solution with the concentration of 1mg/mL under the auxiliary effects of ultrasonic dispersion and magnetic stirring; maintaining the temperature of the graphene oxide solution at 50 ℃, adding 0.5M sodium hydroxide solution into the graphene oxide solution, and continuously stirring until the color of the solution is not changed, wherein the obtained solution is the reduced graphene oxide solution.
Step 5, preparing reduced graphene oxide coated sand:
mixing 100mL of the reduced graphene oxide solution in the step 4 with 200g of the surface modified fine aggregate in the step 3, continuously stirring under the water bath heating condition of 50 ℃ to uniformly wrap the reduced graphene oxide on the surface of the fine aggregate, and placing the obtained fine aggregate in a 60 ℃ oven for 3h for drying for later use. The volume ratio of the sodium hydroxide solution to the graphene oxide solution is 0.005:1.
step 6, preparing a high-performance cement-based composite material containing reduced graphene oxide coated sand:
adding 0.9g of water reducer into 225g of mixing water, and uniformly stirring for 90s for later use; 450g of cement and 1350g of reduced graphene oxide coated sand are sequentially added into a stirring pot, and stirred for 90s at 140 r/min; adding an aqueous solution containing a water reducer in the stirring process, standing for 30s, and stirring for 90s at 280r/min to obtain a mixture slurry; and pouring the mixture slurry into a mold in two layers, and vibrating each layer for 1min to obtain the high-performance cement-based composite material containing the reduced graphene oxide coated sand.
Example 2.
The preparation method of the high-performance cement-based composite material containing the reduced graphene oxide coated sand of the present embodiment is different from that of embodiment 1 in that the volume ratio of the sodium hydroxide solution to the graphene oxide solution is 0.010:1, the rest of the procedure is the same as in example 1.
Example 3.
The preparation method of the high-performance cement-based composite material containing the reduced graphene oxide coated sand of the present embodiment is different from that of the embodiment 1 in that the volume ratio of the sodium hydroxide solution to the graphene oxide solution is 0.015:1, the rest of the procedure is the same as in example 1.
Example 4.
The preparation method of the high-performance cement-based composite material containing the reduced graphene oxide coated sand of the present embodiment is different from that of the embodiment 1 in that the volume ratio of the sodium hydroxide solution to the graphene oxide solution is 0.020:1, the rest of the procedure is the same as in example 1.
Example 5.
The preparation method of the high-performance cement-based composite material containing the reduced graphene oxide coated sand of the present embodiment is different from that of embodiment 1 in that in the present embodiment, the volume ratio of the sodium hydroxide solution to the graphene oxide solution is 0.030:1, the rest of the procedure is the same as in example 1.
Comparative example 1.
This comparative example is different from example 2 in that in this comparative example, the fine aggregate surface was not subjected to modification treatment, that is, only step 6 was performed.
Adding 0.9g of water reducer into 225g of mixing water, and uniformly stirring for 90s for later use. 450g of cement and 1350g of river sand are added into a stirring pot in sequence, and stirred for 90s at 140 r/min. Adding water reducer-containing aqueous solution during stirring. After standing for 30s, 280r/min stirring was carried out for 90s to obtain a mixture slurry. And pouring the mixture slurry into a mould in two layers, and vibrating each layer for 1min to obtain the cement-based composite material containing river sand.
Comparative example 2.
This comparative example is different from example 2 in that in this comparative example, the surface-modified fine aggregate was prepared without using the microwave irradiation, i.e., only the step 3 was adjusted, and the remaining steps were the same as in example 2.
And 3, adding 100g of pretreated fine aggregate in the step 1 into 600mL of surface modification solution in the step 2, stirring for 10min at a rotating speed of 400rmp/min by using a magnetic stirrer, standing for 18h at room temperature, washing off the surface modification solution on the surface of the fine aggregate by using deionized water, and drying in an oven at 60 ℃ to obtain the surface modified fine aggregate.
Comparative example 3.
This comparative example is different from example 2 in that in this comparative example, graphene oxide coated sand was prepared, i.e., step 4 and step 5 were adjusted, and the remaining steps were the same as example 2.
Step 4, preparing graphene oxide solution:
and mixing graphene oxide powder with deionized water, and obtaining uniformly dispersed graphene oxide solution with the concentration of 1mg/mL under the auxiliary effects of ultrasonic dispersion and magnetic stirring.
Step 5, preparing graphene oxide coated sand:
mixing 100mL of graphene oxide solution in the step 4 with 200g of surface modified fine aggregate in the step 3, continuously stirring under the water bath heating condition of 50 ℃ to uniformly wrap graphene oxide on the surface of the fine aggregate, and placing the obtained fine aggregate in a 60 ℃ oven for 3h for later use.
The sand and stone quality and inspection method standards for JGJ52-2006 ordinary concrete were used to test 24-hour water absorption of the sand in examples 1-5 and comparative examples 1-3. The cement-based composite materials of examples 1 to 5 and comparative examples 1 to 3 were tested for compressive strength and flexural strength by the GBT17671-1999 cement mortar strength test method (ISO method), and the resistivity thereof was measured by the four-electrode method.
Table 1 shows the performance test results of the cement-based composite materials of examples 1 to 5 and comparative examples 1 to 3.
The invention has been described in detail with reference to the examples; however, it will be understood by those skilled in the art that various specific parameters in the above embodiments or equivalent substitutions of related technical features may be modified without departing from the technical concept of the present invention, so as to form a plurality of specific embodiments, which are common variations of the present invention and will not be described in detail herein.
Claims (7)
1. The preparation method of the high-performance cement-based composite material containing the reduced graphene oxide coated sand specifically comprises the following steps:
step 1, pretreatment of fine aggregate: washing the fine aggregate with water to remove surface impurities, and then adding the washed fine aggregate into 0.5M sodium hydroxide solution for soaking;
step 2, preparing a surface modification solution: dissolving tris (hydroxymethyl) aminomethane in deionized water at 25 ℃, adjusting the pH value of the solution by using 0.1M hydrochloric acid solution, adding dopamine hydrochloride into the solution for dissolution, and stirring to obtain a surface modified solution;
step 3, fine aggregate surface modification: adding the pretreated fine aggregate in the step 1 into the surface modification solution in the step 2, stirring, then placing the fine aggregate in a microwave oven for microwave heating, heating for 2min under the microwave power of 400W, taking out the fine aggregate, cooling to room temperature, washing off the surface modification solution on the surface of the fine aggregate without load by deionized water, and then placing the fine aggregate in an oven for drying to obtain the surface modified fine aggregate, wherein the mass volume ratio of the pretreated fine aggregate to the surface modification solution is 50-100 g: 500-800 mL;
step 4, preparing a reduced graphene oxide solution: mixing graphene oxide powder with deionized water, obtaining uniformly dispersed graphene oxide solution under the auxiliary effects of ultrasonic dispersion and magnetic stirring, keeping the temperature of the graphene oxide solution at 50 ℃, adding 0.5M sodium hydroxide solution into the graphene oxide solution, and continuously stirring until the color of the solution is not changed, wherein the obtained solution is reduced graphene oxide solution, the concentration of the uniformly dispersed graphene oxide solution is 0.1-5 mg/mL, and the volume ratio of the sodium hydroxide solution to the graphene oxide solution is: 0.005: 1-0.03: 1, a step of;
step 5, preparing reduced graphene oxide coated sand: mixing the reduced graphene oxide solution in the step 4 with the surface modified fine aggregate in the step 3, continuously stirring under a heating condition to uniformly wrap the reduced graphene oxide on the surface of the fine aggregate, and drying the obtained fine aggregate in an oven for later use to obtain reduced graphene oxide coated sand, wherein the mass volume ratio of the surface modified fine aggregate to the reduced graphene oxide solution is 180-220 g: 80-100 mL;
step 6, preparing a high-performance cement-based composite material containing reduced graphene oxide coated sand: adding a water reducer into mixing water, uniformly stirring for 90s for standby, sequentially adding cement and reduced graphene oxide coated sand into a stirring pot, stirring for 90s at a low speed, adding an aqueous solution containing the water reducer in the stirring process, standing for 30s, and stirring for 90s at a high speed to obtain a mixture slurry; pouring the mixture slurry into a mould to obtain the high-performance cement-based composite material containing the reduced graphene oxide coated sand.
2. The method for preparing the high-performance cement-based composite material containing the reduced graphene oxide coated sand, which is disclosed in claim 1, is characterized in that in step 1, the fine aggregate is one or a combination of more than one of river sand, artificial sand or natural sand, and the grain size is 75 μm-2.36 mm.
3. The preparation method of the high-performance cement-based composite material containing the reduced graphene oxide coated sand, which is disclosed in claim 1, is characterized in that in step 2, the mass volume ratio of the tris (hydroxymethyl) aminomethane, the dopamine hydrochloride and the deionized water is 5-10 g: 0.5-3 g:800 to 1200mL.
4. The method for preparing a high-performance cement-based composite material containing reduced graphene oxide coated sand according to claim 1, wherein in the step 2, the pH is adjusted to 8.5, and the stirring speed is 200-600rmp/min for 3min.
5. The method for preparing a high-performance cement-based composite material containing reduced graphene oxide coated sand according to claim 1, wherein in step 6, the mass ratio of cement to reduced graphene oxide coated sand is 1: 2-3, wherein the mass ratio of the mixing water to the cement is 0.4-0.6: 1, wherein the mass of the water reducer is 0.1-0.3% of the mass of the cement.
6. The method for preparing a high-performance cement-based composite material containing reduced graphene oxide coated sand according to claim 1, wherein in the step 6, the low-speed stirring rate is 140+ -5 r/min and the high-speed stirring rate is 280+ -10 r/min.
7. The method for preparing a high performance cement-based composite material containing reduced graphene oxide coated sand according to claim 1, wherein in step 6, the casting process means that the mixture slurry is poured into a mold in two layers, and each layer needs to be vibrated for 1min in order to ensure sufficient compaction of the material.
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| CN108424082A (en) * | 2018-04-19 | 2018-08-21 | 俞小峰 | A kind of preparation method of pleat-free cement-base waterproof coating |
| CN114455874A (en) * | 2022-02-16 | 2022-05-10 | 哈尔滨工业大学 | Preparation method and application of conductive aggregate |
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| WO2015077524A1 (en) * | 2013-11-22 | 2015-05-28 | Schlumberger Canada Limited | Piezoresistive cement nanocomposites |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108424082A (en) * | 2018-04-19 | 2018-08-21 | 俞小峰 | A kind of preparation method of pleat-free cement-base waterproof coating |
| CN114455874A (en) * | 2022-02-16 | 2022-05-10 | 哈尔滨工业大学 | Preparation method and application of conductive aggregate |
Non-Patent Citations (3)
| Title |
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| Bio-inspired functionalization of very fine aggregates for better performance or cementious materials;fang Yi, et al.;CONSTRUCTION AND BUILDING MATERIAL;118104 * |
| 石墨烯及其衍生物对水泥基复合材料性能的影响研究进展;张婷婷;王荣政;孔祥清;付莹;王思月;王学志;混凝土与水泥制品(011);全文 * |
| 铝硅酸盐聚合物及其复合材料研究进展;贾德昌;何培刚;苑景坤;王睿飞;;硅酸盐学报(第12期);全文 * |
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