Environment-friendly graphene oxide mortar and preparation method thereof

Abstract

The invention discloses environment-friendly graphene oxide mortar, which is prepared from the following raw materials in parts by mass: 1 part of cement, 0.4 parts of water, 3 parts of natural riversand, 0.0015-0.003 parts of polycarboxylic acid high-performance water reducing agent powder and 0.0001-0.001 parts of graphene oxide. The preparation method comprises the following steps: (1) preparing a graphene oxide solution; (2) preparing a mixed solution containing graphene oxide mortar; and (3) preparing environment-friendly graphene oxide mortar. The preparation method of the graphene oxide solution comprises the following steps: (I) obtaining a low-order intercalation intercalated graphite continuous material; (II) by taking the intercalated graphite continuous material as an anode and a platinum wire as a cathode, introducing direct current with the voltage of 5V into an electrolyte solution for electrolytic stripping for about 1 minute to obtain graphite oxide; and (III) cleaning up dilute sulfuric acid adsorbed on the graphite oxide through distilled water, and conducting ultrasonic dispersion treatment in water, thereby obtaining the graphene oxide solution.

Description

Technical field [0001] The invention relates to the technical field of concrete production, in particular to an environmentally friendly graphene oxide mortar and a method for preparing the mortar. Background technique [0002] Cement mortar is one of the most important building materials in the field of construction engineering. It has high compressive strength, but high brittleness and low tensile strength. In recent years, the use of graphene oxide to improve the performance of cement mortar has achieved very gratifying results. Studies have shown that the combination of graphene oxide and cement mortar has significantly improved the mechanical properties and impermeability of cement mortar. [0003] At present, the preparation of a typical graphene oxide mortar mainly includes the following three main procedures: [0004] 1. Graphene oxide prepared by traditional chemical oxidation method: Among the traditional chemical oxidation methods, the most commonly used are many improved...

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Problems solved by technology

[0008] 1. The risk of serious environmental pollution is mainly reflected in: the oxidation process of graphite needs to consume a large amount of concentrated sulfuric acid and potassium permanganate at the same time, and the typical ratio of graphite to the two reaction substances is 1:40 and 1:3 respectively; the reaction ends Then it needs to consume a lot of water to elute it from graphite oxide, resulting in the preparation of graphene oxide is usually accompanied by the discharge of a large amount of waste water containing acid and heavy metal ions, and its ratio usually reaches more than 1:1000

[0009] 2. Due to the presence of impurities, the cost of recycling waste acid is high, which is one of the main reasons for the high price of graphene oxide

[0010] 3. The particle size range of graphene oxide is not easy to control, which affects the mechanical properties and durability of mortar, etc.

[0012] Therefore, using graphene oxide prepared by traditional chemical oxidation method to produce graphene oxide mortar on a large scale will not only cause serious environmental pollution risks, but also be expensive, which is not conducive to the industrialization and engineering application of graphene oxide mortar

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