Sprayed concrete

Abstract

The invention discloses sprayed concrete, and belongs to the field of building materials. The concrete is prepared by mixing the following components in parts by mass: 332 to 406 kilograms of cement, 755 to 806 kilograms of sand, 696 to 745 kilograms of gravel, 20 to 25 kilograms of reinforcing fiber, 240 to 280 kilograms of water and 8 to 12 kilograms of additive. According to the concrete, the sprayed concrete is reinforced through the fibers, and the fibers can bear tensile stress, transmit the tensile stress and prevent macroscopic cracks from expanding, so that the performance of the sprayed concrete is improved.

Description

Technical Field

[0001] The invention relates to shotcrete, belonging to the technical field of building materials. Background Art

[0002] With the development of economy and society, the volume of transportation has gradually increased. At present, people have very high requirements for the convenience of travel. Therefore, building a complete and high-quality road network is one of the important goals of my country's infrastructure. At present, with the development of cities, the ground land is gradually saturated, and underground projects appear in people's vision. Whether it is an urban underground project or an intercity highway project, tunnels need to be built. Shotcrete is an indispensable material for the initial support of tunnel construction. The existing shotcrete is prone to cracks due to insufficient tensile strength. Dealing with these problems may increase the cost and extend the construction period. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a shotcrete which is mainly used in tunnels and underground projects in my country.

[0004] 1. A shotcrete, characterized in that it comprises the following components: 332-406 kg of cement, 755-806 kg of sand, 696-745 kg of crushed stone, 20-25 kg of reinforcing fiber, 240-280 kg of water, and 8-12 kg of admixture.

[0005] The concrete is characterized in that the admixture is a mixture of 35 parts of a polycarboxylic acid water reducer, 12 parts of a sulfate early strength agent, and 15 parts of an aluminum sulfate alkali-free quick-setting agent.

[0006] The concrete is characterized in that the crushed stones are granite particles with a particle size of 5-20 mm.

[0007] The concrete is characterized in that the fineness modulus of the sand is 2.73, and the cement is silicate cement with a strength grade of 42.5.

[0008] The concrete is characterized in that the reinforcing fibers are glass fibers.

[0009] The present invention has the following advantages:

[0010] A. The present invention adopts fiber-reinforced shotcrete and uses admixtures to meet the construction performance, increase the strength of concrete, reduce the impact of tunnel karst water accumulation on concrete, and improve the tensile, flexural and fire resistance of concrete. DETAILED DESCRIPTION

[0011] The present invention will be further described with reference to examples.

[0012] Embodiment 1:

[0013] Table 1

[0014]

[0015] The above-mentioned mass of cement, sand, crushed stone and glass fiber are put into a mixer and mixed evenly, and then the above-mentioned mass of admixture and water are added and mixed to obtain the concrete.

[0016] Embodiment 2:

[0017] Table 2

[0018]

[0019] The above-mentioned mass of cement, sand, crushed stone and glass fiber are put into a mixer and mixed evenly, and then the above-mentioned mass of admixture and water are added and mixed to obtain the concrete.

[0020] Embodiment 3:

[0021] Table 3

[0022]

[0023] The above-mentioned mass of cement, sand, crushed stone and glass fiber are put into a mixer and mixed evenly, and then the above-mentioned mass of admixture and water are added and mixed to obtain the concrete.

[0024] The above description is only the basic principle of the present invention and does not impose any limitation on the present invention. Any equivalent changes and modifications made thereto according to the present invention are within the scope of the protection scheme of this patent technology.

Claims

1. A shotcrete, characterized in that: It includes the following components: 332-406kg of cement, 755-806kg of sand, 696-745kg of crushed stone, 20-25kg of reinforcing fiber, 240-280kg of water, and 8-12kg of admixture.

2. The concrete according to claim 1, characterized in that: The admixture is prepared by mixing 35 parts of a polycarboxylic acid water reducing agent, 12 parts of a sulfate early strength agent, and 15 parts of an aluminum sulfate alkali-free quick setting agent.

3. The concrete according to claim 1, characterized in that: The crushed stones are granite particles with a particle size of 5-20 mm.

4. The concrete according to claim 1, characterized in that: The fineness modulus of the sand is 2.73, and the cement is silicate cement with a strength grade of 42.

5.

5. The concrete according to claim 1, characterized in that: The reinforcing fiber is glass fiber.

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