Anti-freezing concrete and preparation method thereof

Abstract

The invention relates to the field of concrete, and particularly discloses anti-freezing concrete and a preparation method thereof. The anti-freezing concrete is composed of the following components in parts by weight: 30 to 35 parts of Portland cement, 15 to 20 parts of water, 32 to 45 parts of sand, 46 to 55 parts of pebbles, 13 to 22 parts of filler, 0.8 to 1.2 parts of a water reducing agent, 3 to 5 parts of anti-crack fibers, 8 to 15 parts of rubber particles, 0.5 to 1 part of a waterproof agent, 0.1 to 0.3 part of an anti-freezing agent and 0.3 to 0.6 part of an air entraining agent, wherein the surface of the concrete is coated with a surface reinforcing agent. The anti-crack fibers in the concrete can improve the crack resistance of the concrete and reduce cracks, so that water permeation is reduced; the rubber particles and the anti-crack fibers can improve the elastic modulus of the concrete, the air entraining agent introduces air holes in the concrete, frost heaving pressure can be buffered, and freeze-thaw damage can be reduced; and the waterproof agent has a waterproof effect, and the anti-permeability is improved, so moisture infiltration is reduced, and the freeze-thaw resistance is improved.

Description

technical field

[0001] The application relates to the field of concrete, more specifically, it relates to a frost-resistant concrete and a preparation method thereof. Background technique

[0002] In cold regions, concrete is prone to freeze-thaw damage, especially concrete structures in contact with water, such as dams, bridge bottoms, etc. Expansion cracks, the structural strength is reduced in two aspects.

[0003] Concrete often uses air-entraining agents to improve the internal pore structure and increase the modulus of elasticity, thereby reducing the damage to the concrete caused by movement. However, the air bubbles generated by the air-entraining agent will also reduce the compactness of the concrete, causing moisture to infiltrate and the compactness of the concrete. And whether there are cracks and internal pore structure will affect the freeze-thaw resistance of concrete. If the density of concrete is not enough, it is easy for water to infiltrate. Whoever freez...

Examples

Embodiment 1

[0042] A kind of antifreeze concrete, adopts following method to make:

[0043] S1: Weigh 30kg of Portland cement, 13kg of filler, 3kg of anti-crack fiber and 8kg of rubber particles into the mixer, mix and stir at a speed of 300r / min for 1min, then add 32kg of sand, 46kg of stones and 15kg of water, and continue to stir rapidly 4min. The filler is a mixture of fly ash and silica fume with a mass ratio of 1:1, the anti-crack fiber is polypropylene fiber, the particle size of rubber particles is 1-2mm, and the sand is fine sand with a fineness modulus of 1.6-2.2. The particle size of the stones is 5-8mm.

[0044] S2: Continue to add 0.8kg of water reducing agent, 0.5kg of antifreeze, 0.1kg of air-entraining agent and 0.3kg of waterproofing agent into the mixer, and stir for 1 minute to obtain a concrete pouring material. The speed of the mixer is 300r / min to obtain a concrete pouring material. The water reducer is polycarboxylate water reducer, the antifreeze is chlorine-free...

Embodiment 2

[0048] A kind of frost-resistant concrete, the difference from Example 1 is that the ratio of raw materials is different, and the ratio of raw materials of each component is shown in Table 2.

[0049] Table 2

[0050]

[0051]

Embodiment 3

[0053]A kind of frost-resistant concrete, the difference from Example 1 is that the ratio of raw materials is different, and the ratio of raw materials of each component is shown in Table 2.

technical field

[0001] The application relates to the field of concrete, more specifically, it relates to a frost-resistant concrete and a preparation method thereof. Background technique

[0002] In cold regions, concrete is prone to freeze-thaw damage, especially concrete structures in contact with water, such as dams, bridge bottoms, etc. Expansion cracks, the structural strength is reduced in two aspects.

[0003] Concrete often uses air-entraining agents to improve the internal pore structure and increase the modulus of elasticity, thereby reducing the damage to the concrete caused by movement. However, the air bubbles generated by the air-entraining agent will also reduce the compactness of the concrete, causing moisture to infiltrate and the compactness of the concrete. And whether there are cracks and internal pore structure will affect the freeze-thaw resistance of concrete. If the density of concrete is not enough, it is easy for water to infiltrate. Whoever freez...

Examples

Embodiment 1

[0042] A kind of antifreeze concrete, adopts following method to make:

[0043] S1: Weigh 30kg of Portland cement, 13kg of filler, 3kg of anti-crack fiber and 8kg of rubber particles into the mixer, mix and stir at a speed of 300r / min for 1min, then add 32kg of sand, 46kg of stones and 15kg of water, and continue to stir rapidly 4min. The filler is a mixture of fly ash and silica fume with a mass ratio of 1:1, the anti-crack fiber is polypropylene fiber, the particle size of rubber particles is 1-2mm, and the sand is fine sand with a fineness modulus of 1.6-2.2. The particle size of the stones is 5-8mm.

[0044] S2: Continue to add 0.8kg of water reducing agent, 0.5kg of antifreeze, 0.1kg of air-entraining agent and 0.3kg of waterproofing agent into the mixer, and stir for 1 minute to obtain a concrete pouring material. The speed of the mixer is 300r / min to obtain a concrete pouring material. The water reducer is polycarboxylate water reducer, the antifreeze is chlorine-free...

Embodiment 2

[0048] A kind of frost-resistant concrete, the difference from Example 1 is that the ratio of raw materials is different, and the ratio of raw materials of each component is shown in Table 2.

[0049] Table 2

[0050]

[0051]

Embodiment 3

[0053]A kind of frost-resistant concrete, the difference from Example 1 is that the ratio of raw materials is different, and the ratio of raw materials of each component is shown in Table 2.

Images