Special powdery water reducing agent for high-strength sprayed concrete

A technology of sprayed concrete and powdery water reducer, which is applied in the field of water reducer, can solve the problems of water reducer handling and storage troubles, and achieve the effect of improving concrete structure, improving workability, and increasing strength

Inactive Publication Date: 2021-04-06
四川砼神建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is more troublesome to carry and store the water reducing agent of the water agent

Method used

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  • Special powdery water reducing agent for high-strength sprayed concrete
  • Special powdery water reducing agent for high-strength sprayed concrete
  • Special powdery water reducing agent for high-strength sprayed concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: A special powdery water reducer for high-strength shotcrete, including the following components by weight, 825 parts of compressed silica fume; plasticizer: 18 parts; binder: 4 parts; surfactant: 3 parts ; Slump retaining agent: 22 parts; high-efficiency water reducer: 88 parts.

[0022] Wherein: the high-efficiency water reducer is a naphthalenesulfonate formaldehyde condensate with a solid content of 1.5%

[0023] The comparison and analysis of the special powder water reducing agent mixed with high-strength shotcrete according to the present invention and ordinary admixture shotcrete is as follows:

[0024] According to the specific construction situation of a certain project department, the exit of a certain tunnel is constructed with HPS3016S concrete spraying trolley. Shotcrete has the following problems: the ...

Embodiment 2

[0048] Example 2: The special powder water reducer for high-strength shotcrete of the present invention includes the following components by weight, 850 parts of compressed silica fume; plasticizer: 35 parts; binder: 3 parts; surfactant: 8 parts parts; slump retaining agent: 50 parts; superplasticizer: 60 parts. Wherein: the plasticizer is a combination of phthalic acid diester and diethyl phthalate. The surfactant is lignosulfonate. The slump retaining agent is polycarboxylic acid.

[0049] The function of the water reducer is to improve the workability of the concrete while keeping the mix ratio unchanged; or to reduce the water consumption and improve the concrete strength while keeping the workability unchanged; or to reduce the amount of cement while keeping the strength constant , save cement and reduce costs. At the same time, the concrete is more uniform and dense after adding the water reducing agent, improving a series of physical and chemical properties, such as ...

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Abstract

The invention discloses a special powdery water reducing agent for high-strength sprayed concrete, which comprises the following components in parts by weight: 800-850 parts of compressed silicon powder; 0-50 parts of a plasticizer; 3-5 parts of an adhesive; 0-10 parts of a surfactant; 0-50 parts of a slump retaining agent; and 50-100 parts of a high-efficiency water reducing agent, wherein the high-efficiency water reducing agent is a naphthalene sulfonate formaldehyde condensate of which the solid content is 1.5% being less than Na2SO4 content and being less than 2.5%. The special powdery water reducing agent for the high-strength sprayed concrete has the advantages that the consumption of cement and an accelerator is reduced, the water reducing agent in the sprayed concrete is canceled, the rebound rate of the sprayed concrete is reduced by 10%, the initial setting time of the sprayed concrete is shortened, the strength of the sprayed concrete is improved and the like; and the special powdery water reducing agent is of a powdery structure and is convenient to carry and store.

Description

technical field [0001] The invention belongs to the field of water reducers, in particular to a special powder water reducer for high-strength shotcrete. Background technique [0002] Basic engineering construction with concrete and mortar as main materials is an important part of national economic development. Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete basically unchanged. Most of them are anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer, etc. After being added to the concrete mixture, it can disperse the cement particles, improve its workability, reduce the unit water consumption, improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement. [0003] The appearance of water reducing agent is divided into water and powder. The solid content of water (also known as mother liquor) is generally 20%, 40%, 60%, and the solid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/22C04B24/24C04B103/30
CPCC04B40/0042C04B2103/302
Inventor 李光辉
Owner 四川砼神建材有限公司
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