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 s

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

Experimental program
Comparison scheme
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Example Embodiment

[0071] The method for preparing shotcrete as described above includes the following steps:

[0072] Mix and stir cement, limestone powder, crushed stone, sand, water reducing agent, accelerator, tackifier and water to obtain sprayed concrete.

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

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

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

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

Example Embodiment

[0078] Example 1

[0079] A shotcrete, each cubic meter mainly consists of the following weight components:

[0080] Cement 320kg, limestone powder 80kg, crushed stone 759kg, sand 965kg, polycarboxylic acid water reducing agent 2.4kg, Red Star Type I accelerator 24kg, methylcellulose 0.1kg and water 176kg.

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

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

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

[0084] The preparation method of the shotcrete includes the following steps:

[0085] Prepare limestone powder with a mesh size of 150 mesh and a fineness of 4.5%. Combine cement, limestone powder, crushed stone, sand, polycarboxylic acid water reducer, Red Star Type I accelerator, methyl cellulose and water Mix in the shaft forced mixer for 150s to obtain shotcrete.

Example Embodiment

[0086] Example 2

[0087] A shotcrete, each cubic meter mainly consists of the following weight components:

[0088] 310kg of cement, 85kg of limestone powder, 750kg of crushed stone, 970kg of sand, 2.2kg of polycarboxylic acid water reducing agent, 22kg of type 782 accelerator, 0.09kg of ethyl cellulose and 180kg of water;

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

[0090] The preparation method of the shotcrete includes the following steps:

[0091] Prepare limestone powder with a mesh size of 150 mesh and a fineness of 4.5%. Combine cement, limestone powder, crushed stone, sand, polycarboxylic acid water reducer, type 782 accelerator, ethyl cellulose and water in the twin shaft Mixing in a forced mixer for 130 seconds 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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