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Sprayed concrete as well as preparation method and application thereof

A shotcrete and accelerator technology, applied in the field of highway engineering materials, can solve the problems of high rebound rate, waste of shotcrete material, low bond strength, etc. excellent effect

Pending Publication Date: 2019-03-08
THE THIRD ENG CO LTD OF THE HIGHWAY ENG BUREAU OF CCCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One object of the present invention is to provide a kind of shotcrete, in order to solve the problem that the bond strength of shotcrete in the prior art is low and the rebound rate is high, resulting in serious waste of shotcrete materials

Method used

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  • Sprayed concrete as well as preparation method and application thereof
  • Sprayed concrete as well as preparation method and application thereof
  • Sprayed concrete as well as preparation method and application thereof

Examples

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preparation example Construction

[0071] The preparation method of sprayed concrete as above may further comprise the steps:

[0072] Mix and stir cement, limestone powder, crushed stone, sand, water reducing agent, quick-setting agent, tackifier and water to obtain shotcrete.

[0073] Sprayed concrete support for tunnels and large caverns shall be constructed by wet mix spraying method. The sprayed concrete support of small caverns and open-air projects can be constructed by the dry mixing method (semi-wet method) spraying method with an aggregate moisture content of 5% to 6%.

[0074] Preferably, the stirring time is 120-300s, preferably 150-200s.

[0075] Typical but non-limiting examples of stirring time are 120s, 130s, 140s, 150s, 160s, 170s, 180s, 190s, 200s, 250s or 300s.

[0076] Application of shotcrete as described above in the construction of tunnels, caverns, slopes and / or foundation pits. The design strength grade of limestone sprayed concrete should not be lower than C20; when it is used for e...

Embodiment 1

[0079] A shotcrete consisting, per cubic meter, principally of the following components by weight:

[0080] 320kg of cement, 80kg of limestone powder, 759kg of crushed stone, 965kg of sand, 2.4kg of polycarboxylate superplasticizer, 24kg of Red Star Type I accelerator, 0.1kg of methylcellulose and 176kg of water.

[0081] Among them, the limestone powder has a mesh number of 150 mesh and a fineness of 4.5%;

[0082] The sand rate of limestone powder concrete for highway engineering is 56%;

[0083] The water-binder ratio of limestone powder concrete for highway engineering is 0.44;

[0084] The preparation method of described sprayed concrete comprises the following steps:

[0085] To prepare limestone powder with a mesh number of 150 and a fineness of 4.5%, mix cement, limestone powder, crushed stone, sand, polycarboxylate superplasticizer, Red Star Type I quick-setting agent, methylcellulose and water in a double-bed Mix in a shaft-forced mixer for 150s to obtain shotcret...

Embodiment 2

[0087] A shotcrete consisting, per cubic meter, principally of the following components by weight:

[0088] 310kg of cement, 85kg of limestone powder, 750kg of gravel, 970kg of sand, 2.2kg of polycarboxylate superplasticizer, 22kg of 782 quick-setting agent, 0.09kg of ethyl cellulose and 180kg of water;

[0089] Among them, the limestone powder has a mesh number of 150 mesh and a fineness of 4.5%;

[0090] The preparation method of described sprayed concrete comprises the following steps:

[0091] Prepare limestone powder with 150 meshes and 4.5% fineness, mix cement, limestone powder, crushed stone, sand, polycarboxylate superplasticizer, 782 quick-setting agent, ethyl cellulose and water in a double-horizon shaft Mix in a forced mixer for 130s to obtain shotcrete.

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Abstract

The invention belongs to the technical field of highway engineering materials and particularly relates to sprayed concrete as well as a preparation method and application thereof. The sprayed concreteis mainly prepared from the following components in parts by weight: 300-350 parts of cement, 60-100 parts of limestone powder, 740-780 parts of gravel, 945-980 parts of sand, 2-3 parts of a water reducer, 20-27 parts of a setting accelerator, 0.08-0.13 part of a tackifier and 150-190 parts of water. According to the sprayed concrete, limestone powder is used as a mineral admixture and is appliedto the sprayed concrete, so that the consumption of the cement is reduced, and the cracking risk of the concrete is reduced; a small amount of the water reducer is added; the water consumption, the total amount of a cementing material and the addition amount of the setting accelerator are reduced; the sand rate is appropriately increased; a trace amount of the tackifier is added; the limestone powder is used as a mineral admixture; a trace amount of cellulose ether is used as a novel tackifier of the sprayed concrete; the workability of the sprayed concrete is improved; the cost and the resilience rate of the limestone powder sprayed concrete are reduced.

Description

technical field [0001] The invention relates to the technical field of highway engineering materials, in particular to shotcrete and its preparation method and application. Background technique [0002] Shotcrete is concrete that is constructed by spraying. The advantage of the concrete spraying construction method is that the construction speed is fast and the requirements for the construction site environment (flatness, shape, etc.) are low. The sprayed concrete is often used for pouring tunnel linings, walls, ceilings and other thin-walled structures or linings of other structures and steel structures. protective layer. [0003] The bond strength of shotcrete in the prior art is low and the rebound rate is high, resulting in serious waste of shotcrete materials. [0004] In view of this, the present invention is proposed. Contents of the invention [0005] An object of the present invention is to provide a shotcrete, in order to solve the problems in the prior art th...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/00C04B2111/00155C04B2201/20C04B2201/50C04B14/28C04B18/12C04B14/06C04B2103/302C04B2103/12C04B24/383
Inventor 王技孝彭龙辉潘登吴琼李永刘方华连俊刚向乐温存良
Owner THE THIRD ENG CO LTD OF THE HIGHWAY ENG BUREAU OF CCCC
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