Concrete spraying additive

A technology of sprayed concrete and admixtures, which is applied in the field of admixtures added to shotcrete, and can solve problems that plague the development of shotcrete, unstable shot quality, and affect project quality and construction progress.

Inactive Publication Date: 2009-01-14
山东科技大学教育服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the high rebound rate and unstable spraying quality are problems that have plagued the development of shotcrete for a long time.
In actual construction operations, the rebound rate of shotcrete is generally above 30%, and some even exceed 40%, which causes material waste and affects project quality and construction progress.

Method used

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  • Concrete spraying additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment one: choose powdery carboxymethyl cellulose 13.5%, powdery polyvinyl alcohol 15%, naphthalene series water reducer 9.5%, reticular polypropylene fiber 1.0% and quick-setting agent 61%, promptly according to concrete 100Kg cement According to the amount calculation, the dosage of each component is 1.08Kg of powdery carboxymethyl cellulose, 1.2Kg of powdery polyvinyl alcohol, 0.76Kg of naphthalene-based water reducer, 0.08Kg of reticular polypropylene fiber and 4.88Kg of quick-setting agent.

Embodiment 2

[0017] Embodiment two: choose powdery carboxymethyl cellulose 14.5%, powdery polyvinyl alcohol 14.0%, naphthalene series water reducer 8.0%, reticular polypropylene fiber 1.50% and quick-setting agent 62%, promptly according to concrete 100Kg cement According to the amount calculation, the dosage of each component is 1.16Kg of powdered carboxymethyl cellulose, 1.12Kg of powdered polyvinyl alcohol, 0.64Kg of naphthalene-based water reducer, 0.12Kg of reticular polypropylene fiber and 4.96Kg of quick-setting agent.

Embodiment 3

[0018] Embodiment three: choose powdery carboxymethyl cellulose 15%, powdery polyvinyl alcohol 13.5%, naphthalene series water reducer 9%, reticular polypropylene fiber 1.20% and quick-setting agent 61.3%, namely according to concrete 100Kg cement According to the amount calculation, the dosage of each component is 1.2Kg of powdered carboxymethyl cellulose, 1.08Kg of powdered polyvinyl alcohol, 0.72Kg of naphthalene-based water reducer, 0.096Kg of reticular polypropylene fiber and 4.904Kg of accelerator.

[0019] In the embodiment, the cold water instant powdery methyl cellulose ether is selected from the MKX45000PF20L type methyl cellulose ether produced by Bayer Company of Germany. The cold water instant powdered polyvinyl alcohol is selected from the polyvinyl alcohol produced by Beijing Luojian Technology Co., Ltd. or Shanghai Tiance Trading Co., Ltd. The naphthalene-based powdery water reducer is FDN naphthalene-based water reducer produced by Beijing Muhu Admixture Co., ...

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Abstract

The invention discloses a shotcrete admixture, comprising: 13 to 15 parts by weight of cold water quick dissolving powdery methylcellulose ether or cold water quick dissolving powdery hydroxyethyl cellulose ether, 13 to 15 parts by weight of cold water quick dissolving powdery polyvinyl alcohol, 8 to 11 parts by weight of naphthalene-series powdery water-reducing agent, 1 to 2 parts by weight of mesh polypropylene fiber and 58 to 62 parts by weight of cement accelerator. The shotcrete admixture is prepared by adding the constituents into the concrete together for increasing the cohesion of concrete and viscosity of early-stage slurry, the slurry initial setting time is short, and the resilience amount of concrete can be reduced by 30 to 50 percent.

Description

technical field [0001] The invention relates to an inorganic material, especially an admixture added to shotcrete. Background technique [0002] At the beginning of the 20th century, Germany developed and applied shotcrete mortar to support the roadway. In the early 1950s, the research of simple sprayer and accelerator was successful, which created conditions for the application of shotcrete technology. By the 1980s, shotcrete technology had developed from the single dry spraying in the past to various forms such as tidal spraying, wet spraying, cement-coated sand shotcrete, and steel fiber shotcrete. Practice has proved that compared with cast-in-place concrete, sprayed concrete is simple and easy to construct, saves the process of formwork, pouring and form removal, and integrates concrete transportation, pouring and tamping into one process, which saves manpower, shortens the construction period, and saves time. It can be constructed in thin-walled structures in high roo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B24/26C04B16/06
CPCC04B2111/00146C04B40/0039
Inventor 张大庆张仁水王立华
Owner 山东科技大学教育服务有限公司
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