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A kind of sprayed concrete and its construction method

A technology of shotcrete and construction method, which is applied in excavation, foundation structure engineering, construction, etc. It can solve problems such as formula and construction technology not meeting the requirements, increasing demand for high-quality shotcrete, low strength of shotcrete, etc., and achieve rebound rate Low, high strength, solve the effect of shedding

Active Publication Date: 2020-08-04
THE GUANGDONG NO 3 WATER CONSERVANCY & HYDRO ELECTRIC ENG BOARD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN107721242A discloses a quick-setting shotcrete, the raw materials of which include by weight: 130-150 parts of ordinary portland cement, 10-15 parts of fly ash, 5-10 parts of silicon fume, 5-10 parts of zeolite powder, sand 100-120 parts, 120-150 parts of stones, 5-8 parts of ethyl orthosilicate, 10-25 parts of internal curing agent, 1-3 parts of water reducing agent, 4-6 parts of quick-setting agent, 40-50 parts of water , the concrete prepared by the invention has a short curing time, which solves the defects that the existing shotcrete is cured after hardening, the curing time is long, and the strength is easy to decrease
[0006] At present, shotcrete generally has problems such as low strength, high rebound rate, and poor comprehensive performance.
With the development of my country's infrastructure, the demand for high-quality sprayed concrete in the fields of concrete protection and repair is increasing, but the current material formula and construction technology have not yet met the requirements

Method used

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  • A kind of sprayed concrete and its construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A shotcrete comprising the following raw materials in parts by weight: 150 parts of cementitious material, 350 parts of sand, 100 parts of gravel, 4 parts of water reducer, 3 parts of quick-setting agent and 30 parts of synergist;

[0042] Among them, the particle size of the sand is 0.85-3.35mm, specifically:

[0043] Sand with a particle size of 0.85-1.18mm accounts for 10% of the total weight of sand; sand with a particle size of 1.4-2.36mm accounts for 40% of the total weight of sand; sand with a particle size of 2.8-3.35mm accounts for 50%;

[0044] The particle size of crushed stone is 2.8-9.5mm, specifically: the crushed stone with a particle size of 2.8-4.75mm accounts for 15% of the total weight of the crushed stone; the crushed stone with a particle size of 4.75-9.5mm accounts for 15% of the total weight of the crushed stone 85% of.

[0045] The steel fiber has a length of 12mm and a diameter of 0.6mm.

[0046] The mass ratio of steel fiber, bentonite and cy...

Embodiment 2

[0058] A shotcrete comprising the following raw materials in parts by weight: 200 parts of cementitious material, 420 parts of sand, 156 parts of gravel, 9 parts of water reducer, 6 parts of quick-setting agent and 45 parts of synergist;

[0059] Among them, the particle size of the sand is 0.85-3.35mm, specifically:

[0060] Sand with a particle size of 0.85-1.18mm accounts for 20% of the total weight of sand; sand with a particle size of 1.4-2.36mm accounts for 20% of the total weight of sand; sand with a particle size of 2.8-3.35mm accounts for 60%;

[0061] The particle size of crushed stone is 2.8-9.5mm, specifically: the crushed stone with a particle size of 2.8-4.75mm accounts for 25% of the total weight of the crushed stone; the crushed stone with a particle size of 4.75-9.5mm accounts for 25% of the total weight of the crushed stone 75% of.

[0062] The steel fiber has a length of 18 mm and a diameter of 0.3 mm.

[0063] The mass ratio of steel fiber, bentonite and ...

Embodiment 3

[0075] A shotcrete, comprising the following raw materials in parts by weight: 180 parts of cementitious material, 400 parts of sand, 120 parts of gravel, 6 parts of water reducer, 4 parts of quick-setting agent and 40 parts of synergist;

[0076] Among them, the particle size of the sand is 0.85-3.35mm, specifically:

[0077] Sand with a particle size of 0.85-1.18mm accounts for 18% of the total weight of sand; sand with a particle size of 1.4-2.36mm accounts for 36% of the total weight of sand; sand with a particle size of 2.8-3.35mm accounts for 46%;

[0078] The particle size of crushed stone is 2.8-9.5mm, specifically: the crushed stone with a particle size of 2.8-4.75mm accounts for 20% of the total weight of the crushed stone; the crushed stone with a particle size of 4.75-9.5mm accounts for 20% of the total weight of the crushed stone 80% of.

[0079] The steel fibers have a length of 16 mm and a diameter of 0.45 mm.

[0080] The mass ratio of steel fiber, bentonite ...

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Abstract

The invention discloses a shotcrete and a construction method thereof. The shotcrete is prepared from a cementing material, sands, gravels, a water reducing agent, an accelerator and a synergist; andthe synergist comprises steel fibers, bentonite and cyclodextrine. The construction method comprises the following steps: (1) preparing a premixed powder: mixing the water reducing agent, bentonite and cyclodextrine with the diatomite according to a formula ratio, and grinding and sieving the obtained mixture to obtain the premixed powder; (2) preparing shotcrete: mixing the sands and gravels withthe premixed powder obtained in step (1) according to a formula ratio, adding the cementing material, the accelerator and water, and mixing so as to obtain the shotcrete; (3) pre-spraying: spraying an aqueous sodium silicate solution to the spraying surface before concrete spraying to obtain a bonding protection surface; and (4) spraying the concrete. The shotcrete disclosed by the invention hasgood comprehensive performances, has a high strength under low-temperature maintenance, and meets the requirements on severe environments.

Description

technical field [0001] The invention belongs to the technical field of high-strength shotcrete, and in particular relates to a shotcrete and a construction method thereof. Background technique [0002] Shotcrete is the use of spraying machinery, compressed air or other power, to spray cement, sand, stones and admixtures in a certain proportion to the surface to be sprayed through the nozzle, and within a few minutes Concrete reinforcement formed by internal condensation and hardening. During construction, it is usually accompanied by deep foundation pit operations. In order to ensure the safety of workers when working in the foundation pit, the stability of the foundation pit slope must be maintained. In order to prevent the foundation pit from collapsing, shotcrete is mainly used to reinforce the slope of the foundation pit. [0003] CN108191354A discloses a shotcrete, the mass ratio of its components is: cement: 1 part, water: 0.40-0.45 parts, fine aggregate: 2.20-2.30 p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/08C04B20/00E02D17/04
CPCC04B20/0076C04B28/04C04B28/08C04B2201/50E02D17/04C04B14/06C04B14/02C04B2103/302C04B2103/12C04B14/48C04B14/104C04B24/383
Inventor 詹钦慧卢宾杨维王崇武林灿欣吴华艺
Owner THE GUANGDONG NO 3 WATER CONSERVANCY & HYDRO ELECTRIC ENG BOARD CO LTD