High-performance graphene concrete and preparation method thereof

Abstract

The invention provides high-performance graphene concrete and a preparation method thereof. The method for preparing the high-performance graphene concrete comprises the following steps: (1) carryingout first mixing on graphite and water, and carrying out aqueous phase stripping processing on the obtained mixture; (2) carrying out second mixing on a product obtained in (1), air entraining agent,cement, inorganic active mineral powder and aggregate to obtain in situ dispersion graphene concrete. Therefore, the preparation method has the advantages of simple preparation technology, small pollution, low energy consumption and low cost and is easy for industrial production, major engineering and infrastructure construction can be favorably guaranteed, the compressive strength and the freeze-thaw resistance of the graphene concrete can be obviously improved, so that the mechanical property of the graphene concrete is slowly lowered under a cold hash condition, and surface denudation and elasticity modulus losses are small.

Description

technical field [0001] The invention relates to the field of material technology, in particular to high-performance graphene concrete and a preparation method thereof. Background technique [0002] Concrete is one of the most widely used building materials. It has become the most successful structural engineering material because of its wide source of materials, adjustable mechanical properties, good plasticity before hardening, and reinforcement with steel bars. However, concrete itself also has disadvantages such as low flexural strength and poor toughness, especially in the environment with low temperature, frozen water and supercooled water exist in the capillary pores of concrete at the same time, resulting in volume expansion and water migration. Due to the expansion pressure and osmotic pressure, some non-stressed cracks appear and cause freeze-thaw damage. The freeze-thaw damage of concrete has become one of the main problems of building aging diseases in our countr...

AI Technical Summary

Problems solved by technology

[0005] 1. The traditional oxidation method of exfoliating graphite flakes to prepare graphene is limited by environmental hazards, high safety risk factor, long production cycle, low yield and many defects in nanosheets. It is difficult to achieve large-scale continuous production and cannot guarantee Extensive use in cement-based composite materials;

[0006] 2. Due to the limitation of raw materials, scale and yield, the cost of preparing graphene by the oxidation exfoliation process is high, roughly around 50 yuan / g, that is, 50 million yuan / ton, and it is almost impossible to widely promote it in cement concrete application;

[0007] 3. Graphene can act as a template in the cement hydration process to adjust the structure and properties of crystal products, but there is no effective means to control the surface properties of graphene nanosheets, so it is difficult to play its regulating role, and the compatibility of graphene and cement The resistance will also affect the material stability and durability;

[0008] 4. The current preparation method is difficult to control the size of graphene well, and cannot effectively fill the pores of concrete, so it is difficult to exert the modification effect of graphene;

[0009] 5. In the existing reports, graphene has a limited effect on improving the mechanical properties and frost resistance of concrete

[0010] Therefore, the research and industrial production of concrete, especially high-performance special-purpose concrete, needs to be deepened.

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