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...

Examples

preparation example Construction

[0033] In the present invention, there is no special limitation on the preparation method of the alkali-activated glue, and the method for preparing the composition well-known to those skilled in the art can be used. In the present invention, the preparation of the alkali-activated glue preferably includes the following steps:

[0034] (1) mixing reinforcing filler, activator, dispersant and water to obtain mixed slurry;

[0035] (2) Mixing the mixed slurry obtained in the step (1) with a gelling material, an expansion agent filler, an inorganic modified filler, a defoamer and a retarder to obtain an alkali-activated gel.

[0036] In the present invention, the reinforcing filler, activator, dispersant and water are preferably mixed to obtain a mixed slurry. In the present invention, there is no special limitation on the mixing operation of the reinforcing filler, activator, dispersant and water, and the technical solution for preparing the mixed slurry well known to those ski...

Embodiment 1

[0044] Raw materials: 300g mineral powder (selected from Shaogang mineral powder), 180g activator potassium silicate (modulus 2.4) (the potassium silicate container should be shaken upside down before taking it out to prevent the bottom from settling and affecting the quality of the activator) , rubber powder 4g, gypsum 4g, light-burned magnesium oxide 15g, polyvinyl alcohol fiber 3g, dispersant (polyethylene glycol) 3g, retarder (zinc sulfate) 3g, defoamer (organic silicon defoamer) 9g .

[0045] Mix the polyvinyl alcohol fiber and dispersant into the water glass and stir (249r / min) to disperse the polyvinyl alcohol fiber evenly to obtain a mixed slurry; first put the mineral powder, rubber powder, gypsum and light-burned magnesium oxide into the stirring pot Stir at a low speed (150r / min) and control the time for 2 minutes to obtain the dry material; mix the mixed slurry, dry material and its defoamer and retarder, and manually stir for 2 minutes until the raw materials are ...

Embodiment 2

[0048] Raw material: 300g mineral powder (selected from Shaogang mineral powder), 220g activator sodium water glass (modulus 2.0) (shake the sodium water glass container upside down before taking it out to prevent the bottom from settling and affecting the quality of the activator) , rubber powder 3g, gypsum 3g, light-burned magnesium oxide 15g, ultra-high molecular weight polyvinyl alcohol fiber 3g, dispersant (polyethylene glycol) 3g, retarder (zinc sulfate) 3g, defoamer (organic silicon defoamer) agent) 9g.

[0049] Mix polyvinyl alcohol fiber and dispersant into water glass and stir (249-284r / min) to disperse polyvinyl alcohol fiber evenly to obtain mixed slurry; put mineral powder, rubber powder, gypsum and light-burned magnesium oxide into the stirring pot Stir at medium and low speed (150r / min) and control the time for 2 minutes to obtain dry material; mix the mixed slurry, dry material, defoamer and retarder, and manually stir for 2 minutes until the raw materials are ...

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...

Examples

preparation example Construction

[0033] In the present invention, there is no special limitation on the preparation method of the alkali-activated glue, and the method for preparing the composition well-known to those skilled in the art can be used. In the present invention, the preparation of the alkali-activated glue preferably includes the following steps:

[0034] (1) mixing reinforcing filler, activator, dispersant and water to obtain mixed slurry;

[0035] (2) Mixing the mixed slurry obtained in the step (1) with a gelling material, an expansion agent filler, an inorganic modified filler, a defoamer and a retarder to obtain an alkali-activated gel.

[0036] In the present invention, the reinforcing filler, activator, dispersant and water are preferably mixed to obtain a mixed slurry. In the present invention, there is no special limitation on the mixing operation of the reinforcing filler, activator, dispersant and water, and the technical solution for preparing the mixed slurry well known to those ski...

Embodiment 1

[0044] Raw materials: 300g mineral powder (selected from Shaogang mineral powder), 180g activator potassium silicate (modulus 2.4) (the potassium silicate container should be shaken upside down before taking it out to prevent the bottom from settling and affecting the quality of the activator) , rubber powder 4g, gypsum 4g, light-burned magnesium oxide 15g, polyvinyl alcohol fiber 3g, dispersant (polyethylene glycol) 3g, retarder (zinc sulfate) 3g, defoamer (organic silicon defoamer) 9g .

[0045] Mix the polyvinyl alcohol fiber and dispersant into the water glass and stir (249r / min) to disperse the polyvinyl alcohol fiber evenly to obtain a mixed slurry; first put the mineral powder, rubber powder, gypsum and light-burned magnesium oxide into the stirring pot Stir at a low speed (150r / min) and control the time for 2 minutes to obtain the dry material; mix the mixed slurry, dry material and its defoamer and retarder, and manually stir for 2 minutes until the raw materials are ...

Embodiment 2

[0048] Raw material: 300g mineral powder (selected from Shaogang mineral powder), 220g activator sodium water glass (modulus 2.0) (shake the sodium water glass container upside down before taking it out to prevent the bottom from settling and affecting the quality of the activator) , rubber powder 3g, gypsum 3g, light-burned magnesium oxide 15g, ultra-high molecular weight polyvinyl alcohol fiber 3g, dispersant (polyethylene glycol) 3g, retarder (zinc sulfate) 3g, defoamer (organic silicon defoamer) agent) 9g.

[0049] Mix polyvinyl alcohol fiber and dispersant into water glass and stir (249-284r / min) to disperse polyvinyl alcohol fiber evenly to obtain mixed slurry; put mineral powder, rubber powder, gypsum and light-burned magnesium oxide into the stirring pot Stir at medium and low speed (150r / min) and control the time for 2 minutes to obtain dry material; mix the mixed slurry, dry material, defoamer and retarder, and manually stir for 2 minutes until the raw materials are ...

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