Composite admixture for shotcrete

A composite admixture and sprayed concrete technology, which is applied in the field of concrete admixtures, can solve the problems of concrete strength influence, low homogeneity level, water-cement ratio increase, etc., achieve reinforcement, increase hydration speed, and maintain moisture Effect

CN111925149AInactive Publication Date: 2020-11-13杭州志鑫生活服务有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-11-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of concrete admixtures, and discloses a composite admixture for shotcrete. The composite admixture is prepared from the following substances in parts by weight: 5 to 20 parts of polycarboxylate superplasticizer, 1 to 5 parts of disodium alcohol ether sulfosuccinate, 2 to 8 parts of tackifier, 1 to 3 parts of ammonium nitrate, 5 to 10 parts of alcohol amine carboxylate, 0.01 to 0.1 part of sodium dodecyl benzene sulfonate, 0.01 to 0.1 part of organic silicon defoamer and 30 to 80 parts of ultrafine fly ash. After the admixture is added, the contact performance of concrete and a spraying surface is good, the problem of serious springback of sprayed concrete is effectively solved, coagulation and solidification of the sprayed concrete can be accelerated, and the strength of the concrete is improved.
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Description

technical field

[0001] The invention belongs to the technical field of concrete admixtures, in particular to a composite admixture for shotcrete. Background technique

[0002] Shotcrete is a kind of quick-setting concrete used to strengthen and protect structures or rock surfaces. This technology uses compressed air or other power to mix cement, sand, stones and admixtures in a certain proportion with the help of spraying machinery. The mixed material is sprayed onto the sprayed surface through the nozzle, and the concrete reinforcement material is formed by setting and hardening within a few minutes. Shotcrete is mainly used for spraying reinforcement of mine shafts, tunnels, culverts and other projects. The admixture used is generally a quick-setting agent. Since the inner walls of coal mine lanes, tunnels, culverts, etc. have a lot of water, and the walls of the tunnels are relatively smooth, the bonding force between the shotcrete and the walls becomes smaller, and it i...

Examples

Embodiment 1

[0017] A composite admixture for shotcrete is composed of the following parts by weight: 5 parts of polycarboxylate water reducer, 5 parts of alcohol ether sulfosuccinic acid monoester disodium salt, 2 parts of tackifier, and 3 parts of ammonium nitrate , 5 parts of alcohol amine carboxylate, 0.1 part of sodium dodecylbenzenesulfonate, 0.01 part of silicone defoamer, 30 parts of superfine fly ash.

[0018] The tackifier is composed of modified starch and polyvinyl alcohol.

[0019] The alcohol amine carboxylate is an oxalate ester of triisopropanolamine.

Embodiment 2

[0021] A composite admixture for shotcrete is composed of the following parts by weight: 20 parts of polycarboxylate water reducer, 1 part of alcohol ether sulfosuccinic acid monoester disodium salt, 8 parts of tackifier, and 1 part of ammonium nitrate , 10 parts of alcohol amine carboxylate, 0.01 part of sodium dodecylbenzenesulfonate, 0.1 part of organic silicon defoamer, and 80 parts of superfine fly ash.

[0022] The tackifier is composed of acrylonitrile grafted starch and polyvinyl alcohol.

[0023] The alcohol amine carboxylate is diethanol monoisopropanolamine maleate.

Embodiment 3

[0025] A composite admixture for shotcrete is composed of the following parts by weight: 12 parts of polycarboxylate water reducer, 4 parts of alcohol ether sulfosuccinic acid monoester disodium salt, 6 parts of tackifier, and 2 parts of ammonium nitrate , 8 parts of alcohol amine carboxylate, 0.04 part of sodium dodecylbenzenesulfonate, 0.02 part of silicone defoamer, 50 parts of superfine fly ash.

[0026] The tackifier is composed of modified starch and polyvinyl alcohol.

[0027] The thickening agent is composed of modified tapioca starch and polyvinyl alcohol with molecular weight between 80000-10000.

[0028] The alcohol amine carboxylate is triisopropanolamine maleate.