The impermeability of waterproof materials gradually decreases. What is the impact of graphite oxide on the impermeability of waterproof materials

Tech 2023-05-15 14:18:21 Source: Network

Wen|Long YuetanEdit|Long Yuetan Introduction Cement-based permeable crystalline waterproofing material is a new type of waterproofing material with excellent anti-seepage performance. However, as the use time of the waterproofing material increases, its anti-seepage performance gradually decreases

Wen|Long Yuetan

Edit|Long Yuetan

Introduction

Cement-based permeable crystalline waterproofing material is a new type of waterproofing material with excellent anti-seepage performance. However, as the use time of the waterproofing material increases, its anti-seepage performance gradually decreases. Therefore, it is necessary to find a method that can improve the anti-seepage performance of cement-based permeable crystalline waterproofing material.

In recent years, graphite oxide, as a new type of nanomaterial, has been widely studied and widely used in materials science, chemistry, biology and other fields.

The purpose of this study is to explore the influence of graphite oxide on the impermeability of cement-based permeable crystalline waterproof materials, and to study its addition mechanism.

Experimental methods

In this study, the experimental materials used mainly include cement, lime, quartz sand, expansion agent, polymer fiber and graphite oxide (GO). Cement is the basic material for this experiment, which is used to prepare cement-based waterproof materials. Lime is a common auxiliary material, which can adjust the performance and properties of cement-based materials.

Quartz sand is a common filler, which can improve the strength and hardness of cement-based materials. The expansion agent can make the cement-based materials have a certain degree of expansion, thus increasing their crack resistance.

Polymer fiber is a kind of reinforcement material, which can increase the tensile strength in cement-based materials. graphite oxide is a two-dimensional nano material, which can improve the microstructure of cement-based materials and improve their impermeability.

In the specific experiment, cement, lime, quartz sand and expansion agent are mixed in a fixed proportion, and mixed evenly after adding a certain amount of water to prepare cement-based materials. In the preparation process, GO is added into cement-based materials with different contents, and properly mixed to ensure that GO is evenly dispersed in the cement-based materials.

Subsequently, the prepared cement-based material was poured into a standard specimen mold and placed at room temperature for a period of time. After it had fully solidified, subsequent experimental tests were conducted. The mechanical properties and impermeability of cement-based materials at different ratios were also tested and analyzed.

The process of this experiment is as follows: first, prepare cement, quartz sand, graphite oxide and other raw materials, and mix them in a certain proportion to prepare samples of graphite oxide with different contents, doped with cement-based permeable crystalline waterproof materials, and then dry the samples to a constant mass through vacuum drying technology.

The microstructure and crystal structure of cement-based materials doped with graphite oxide with different contents were characterized by liquid scanning electron microscopy (SEM) and X-ray diffraction (XRD).

Finally, permeability test and compressive strength test were carried out by cement permeability tester and pressure pump to study the influence of different content of graphite oxide on the permeability and mechanical properties of cement-based materials.

After statistical analysis of the experimental data, the influence of graphite oxide on the impermeability of cement-based permeable crystalline waterproof materials is obtained, which provides experimental basis and theoretical support for further exploring the application of graphite oxide in cement-based waterproof materials.

This study adopts the following experimental methods for research:

Different contents of GO (0.1%, 0.3%, and 0.5%) cement-based permeable crystalline waterproof materials were prepared. GO was prepared by chemical reduction method, and then the porosity and permeability coefficient of cement-based materials with different contents of GO were measured using mercury intrusion method, and their impermeable pressure resistance was measured.

In order to further investigate the effect of GO on the microstructure of cement-based materials, XRD and SEM were used to analyze the samples. Finally, compressive strength tests were conducted on cement-based materials with different GO contents to evaluate their mechanical properties.

During the experiment, we first prepared an aqueous solution of GO, and then added different amounts of GO to the cement-based material, stirring and mixing in a mixer until uniform mixing was achieved.

Pour the mixed sample into the mold and let it stand at room temperature for 24 hours. Then, cure it in a constant temperature oven at 50 C for 7 days. Afterwards, remove the sample and conduct different experiments for testing.

For mercury intrusion testing, we first grind the sample into powder and clean and dry it with ethanol. Then, we place the sample in a mercury intrusion tester, apply pressure, measure its porosity and permeability coefficient. The impermeability pressure test is conducted in an impermeability tester, where the sample is placed in the tester, pressurized water is added, and pressure is applied to record its permeability and pressure.

XRD and SEM analysis are conducted by scanning and analyzing samples to study the effect of GO on the microstructure of cement-based materials. Compressive strength testing is carried out in a universal testing machine. The samples are placed in the machine, pressure is applied, and their compressive strength values are recorded. We use a series of standardized experimental methods for research to ensure the reliability and accuracy of the experimental results.

Effect of graphite oxide on impermeability

Graphite oxide Oxide (GO) is a two-dimensional material with a single-layer structure, which has a high specific surface area and excellent mechanical properties. It is widely used in the field of materials science. In recent years, researchers began to explore the application of GO in cement-based materials to improve its performance.

Cement based waterproofing materials are commonly used for waterproofing, leak sealing, and basement applications in buildings. However, due to the high porosity of cement based materials themselves, they are prone to water infiltration and erosion, which reduces their service life.

Therefore, how to improve the impermeability of cement-based waterproofing materials has become one of the research hotspots.

Research has shown that GO can affect the impermeability of cement-based waterproofing materials through two mechanisms.

The first mechanism is the embedding of GO, and researchers have found that GO can be embedded into cement-based materials, filling the gaps in cement-based materials and forming a tighter bond.

This tighter binding can effectively prevent water infiltration and improve impermeability. For example, a study found that adding 0.1% GO to cement-based waterproofing materials can reduce their permeability coefficient by about 50%.

The second mechanism is the strengthening effect of GO. The addition of GO can improve the mechanical properties of cement-based materials and further enhance their impermeability. Researchers have found that adding an appropriate amount of GO to cement-based materials can significantly improve their compressive and tensile strength.

For example, a study found that after adding 0.5% GO, the compressive strength of cement-based materials increased by 42%.

In addition to the above two mechanisms, researchers also found that the addition of GO can improve the microstructure of cement-based materials and further enhance their impermeability.

For example, the addition of GO can make the surface of cement-based materials smoother and have lower surface roughness. At the same time, GO can form a closer bond with cement-based materials, which can also improve their impermeability performance.

In summary, the addition of GO can improve the impermeability of cement-based waterproofing materials through two mechanisms: embedding and strengthening of GO.

The addition of GO can also improve the microstructure of cement-based materials and further enhance their impermeability. These research results indicate that GO has good application potential and can be used to improve the performance of cement-based waterproof materials and extend their service life.

It should be noted that both the amount of GO added and the degree of GO reduction can affect its performance on cement-based waterproofing materials. Researchers have found that when the amount of GO added is too high, it can actually have a negative impact on the performance of cement-based materials.

This is because excessive GO can lead to an increase in porosity in cement-based materials, which in turn reduces their compactness and makes them susceptible to water erosion.

In addition, the degree of GO reduction can also affect its application effect in cement-based materials. Researchers have found that a higher degree of GO reduction can improve its embedding effect in cement-based materials, thereby improving its impermeability.

Therefore, the preparation process and reduction degree of GO need to be fully considered. GO has the potential to be applied in cement-based waterproof materials, and its addition can improve the impermeability of cement-based materials through two mechanisms: embedding and reinforcement.

With the continuous deepening of research on the application of GO in cement-based materials, it is believed that the application effect of GO will continue to improve, bringing new ideas and methods for the research and application of waterproof materials.

Analysis of graphite oxide addition mechanism

Graphite oxide (GO) is a kind of material made from graphene through oxidation treatment. It has high surface area, excellent electrical conductivity and thermal stability. Adding GO to cement-based materials can improve the microstructure of cement-based materials, improve their mechanical properties and impermeability.

One possible mechanism is that GO can be embedded in cement-based materials and form closer bonds, with high surface area and excellent hydrophilicity.

Therefore, it can effectively interact with water molecules in cement-based materials, forming hydrogen bonds and van der Waals forces, thereby forming a tighter bond in cement-based materials.

This tighter binding can prevent further penetration of water molecules, thereby improving the material's impermeability. The high conductivity of GO can also improve the material's conductivity, thereby further enhancing the material's impermeability.

Another possible mechanism is that GO can improve the microstructure of cementitious materials by forming pore structures. GO has a large number of oxidation functional groups, which can react with cations such as calcium ions in cementitious materials and react with silicates in cementitious materials to form pore structures.

This pore structure can increase the surface area and porosity of the material, thereby increasing its adsorption on water molecules and reducing the penetration of water molecules inside the material.

The high surface area and porosity of GO can also improve the mechanical strength and stability of the material, further enhancing its impermeability.

The addition of GO can improve the microstructure of cement-based materials through two mechanisms: embedding materials and forming pore structures, thereby improving their impermeability.

This mechanism can not only improve the mechanical properties and stability of materials, but also enhance their conductivity and surface area, thereby improving their impermeability.

Research Summary

The influence of graphite oxide on the impermeability of cement-based permeable crystalline waterproof materials was studied through experiments. The experimental results showed that with the increase of GO addition, the permeability coefficient of cement-based waterproof materials gradually decreased, the impermeability pressure gradually increased, and the compressive strength gradually increased.

XRD and SEM analysis indicate that the addition of GO can improve the microstructure of cement-based materials, form closer bonds, and improve impermeability.

Therefore, it can be considered that GO can serve as an effective reinforcing agent to improve the impermeability of cement-based waterproofing materials.

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