High efficiency composite expanding agent for high-strength self-stressing concrete filled steel tube and preparation method thereof

A technology of concrete filled steel tubes and composite expansion agent, applied in the field of construction, can solve the problems of unstable expansion performance, increased shrinkage, low water consumption of high-strength concrete, etc., to achieve stable long-term expansion performance, early expansion start time, and improve overall bearing capacity. Effect
CN104909596AActive Publication Date: 2015-09-16CHINA STATE CONSTRUCTION ENGINEERING CORPORATION +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
Publication Date
2015-09-16

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Patent Text Reader

Abstract

The invention belongs to the building field, and concretely relates to a high efficiency composite expanding agent for a high-strength self-stressing concrete filled steel tube and a preparation method thereof. The high efficiency composite expanding agent comprises the following components by mass percentage: 22-40% of light calcined magnesia, 12-25% of active calcium oxide, 6-14% of calcined dolomite, 18-30% of sulphoaluminate cement clinker, 12-18% of natural gypsum and 2-6% of modified meerschaum powder. Through a design of hydration expansion characteristics of different components, expansion performance and high-strength concrete intensity are cooperated for development, expansion usefulness is high, water for hydration is little, expansion beginning time is early, and the expansion performance is stable, by introducing a maintenance material, problems of difficult maintenance of a steel pipe under enclosing condition and difficult supply of expanding agent and water for concrete hydration can be solved, and the high efficiency composite expanding agent is suitable for preparing the high-strength self-stressing concrete filled steel tube under enclosing condition of the steel pipe.
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Description

technical field

[0001] The invention belongs to the field of construction, and in particular relates to a high-efficiency composite expansion agent suitable for high-strength self-stressed steel pipe concrete and a preparation method thereof. Background technique

[0002] Due to its unique combined structural advantages, CFST has gradually been widely used in the construction field. As the building structure gradually develops towards super high-rise and long-span, CFST with higher strength grades has also emerged as the times require. In order to give full play to the mechanical advantages of the combined components of high-strength concrete and steel pipes, an expansion agent is added to the concrete to prepare high-strength self-stressing steel pipe concrete, which can achieve the purpose of tightly integrating with steel pipes, preventing debonding and voiding, and improving bearing capacity. At present, various CFST expansion agents cannot meet the performance requireme...

Claims

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