Alkali-activated binder and application of alkali-activated binder in concrete strenghtening

Abstract

The invention provides an alkali-activated binder and the application of the alkali-activated binder in concrete strengthening. The alkali-activated binder is prepared from the following components in parts by weight: 10 to 100 parts of a binding material, 10 to 100 parts of an activator, 0 to 50 parts of water, 0.1 to 20 parts of an expanding agent filler, 0.1 to 20 parts of an inorganic modified filler, 0.1 to 20 parts of a strengthening filler, 0.1 to 10 parts of a defoaming agent, 0.1 to 10 parts of a dispersing agent and 0 to 10 parts of a retarder. The binding material is used as a main matrix, and is cooperated with the activator and the water to adjust the water-solid ratio; through the cooperation with the components such as the expanding agent filler, the inorganic modified filler and the strengthening filler, the acid and alkali corrosion resistance and the high temperature resistance of the alkali-activated binder are improved; furthermore, under the long-term action, the deterioration degree is low. An experimental result shows that the alkali-activated binder can keep certain strength at the temperature of 1,000 DEG C; after the alkali-activated binder is maintained for 28 days, the compression strength can be 74.9 MPa, and the breaking strength can be 6.3 MPa.

Description

technical field [0001] The invention relates to the technical field of engineering materials, in particular to an alkali-activated adhesive and its application in concrete reinforcement. Background technique [0002] Reinforced concrete structure is the most important structural form in civil engineering, and its safety is closely related to the healthy development of the national economy. However, with the increase of the service life and the change of the service environment, the deterioration and functional failure of reinforced concrete structures are more common and serious. [0003] In practice, people have summed up many reinforcement methods after long-term exploration. At present, the traditional reinforcement methods include enlarging section method, replacement method, prestressed reinforcement method, bonded steel method and so on. Although most of the above methods have played a certain role in improving the strength, stiffness and seismic performance of the s...

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Problems solved by technology

Although most of the above methods have played a certain role in improving the strength, stiffness and seismic performance of the structure, there are still many disadvantages: ① self-heavy, which may cause chain reinforcement problems; It has a great impact; ③The corrosion resistance is poor, and it is easy to lose its due function, which is particularly prominent in the application in the factory building; ④The construction is complicated and the cycle is long, which affects the normal work and life, and the social benefits are poor

However, the use of epoxy resin glue as a binder has the following disadvantages: resin glue has poor high temperature resistance (use temperature below 300°C), easy aging and other problems, and its shortcomings are also exposed during the process of strengthening concrete, which is not good. play a long-term protective role

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