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Powder coal ash expanding self-dense concrete for filling square steel pipe

A technology for self-compacting concrete and fly ash, which is applied in the concrete field in the technical field of building materials, can solve the problems of concrete expansion cracking, high content of free calcium oxide, unqualified cement stability, etc. The effect of reducing the amount of cement

Inactive Publication Date: 2009-02-18
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its high content of free calcium oxide, if it is used improperly, it will lead to unqualified cement stability and even cause concrete expansion and cracking, so it has not been well utilized so far.

Method used

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  • Powder coal ash expanding self-dense concrete for filling square steel pipe
  • Powder coal ash expanding self-dense concrete for filling square steel pipe

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Embodiment Construction

[0028] The embodiments of the present invention are described in detail below: the present embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation and specific operation process are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0029] The large-volume fly ash high-strength expansive self-compacting concrete used to fill square steel pipes is composed of ordinary Portland cement, fly ash, microsilica fume, sand, gravel, activator, retarding water reducer and water Proportion, complete mixing and pouring into 120mm×120mm×400mm square cross-section cold-formed steel pipes by the following process: first dry mix the cement, fly ash, micro-silica fume and activator according to the design requirements of the mix ratio for 30 seconds , add coarse aggregate and fine aggregate, the stirring time is 30 seconds to 1 minute, add 60% water and stir fo...

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Abstract

A high calcium flyash self compacting concrete with a large dose and a low cost used for filling the square steel tube, which is including: common portland cement, flyash, micro silica powder, water, sand, detritus, exciting agent and slow setting water reducing agent, wherein the content of the common portland cement is 9.0-10.0%, the content of the flyash is 9.0-10.0%, the content of the micro silica powder is 1.2-2.0%, the content of the water is 7.5-8.0%, the content of the sand is 24-30%, the content of the sand is detritus is 40-47%, the content of the exciting agent is 0.5-1.0%, the content of the slow setting water reducing agent is 0.1-0.3%. The invention fully uses the lateral reactivity of the high calcium flyash, reuses the wastes resource, has a low cost to produce the concrete which is suitable for filling the steel pipes and has a high fluidity and a high strength and a good continuable dilatability.

Description

technical field [0001] The invention relates to concrete in the technical field of building materials, in particular to a fly ash expanded self-compacting concrete used for filling square steel pipes. Background technique [0002] Concrete filled steel tubes have the advantages of high bearing capacity, good plasticity and toughness, beautiful appearance, convenient construction, fire resistance and remarkable economic benefits. In recent years, they have been rapidly popularized and applied in high-rise and long-span structures. The steel pipe and the concrete in the steel pipe are combined, and the steel pipe produces a fastening force on the concrete filled in it, so that each can play its own strengths and obtain excellent mechanical properties and structural properties. Therefore, in order to achieve this purpose, expansion agents are usually added to concrete components such as Portland cement, coarse and fine aggregates, etc., to cause a chemical reaction in the Portl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/08C04B14/04C04B14/06C04B22/14C04B24/20
CPCC04B2111/00103C04B28/04C04B2111/00663Y02W30/91C04B14/02C04B14/06C04B18/08C04B2103/10C04B2103/302
Inventor 陈兵
Owner SHANGHAI JIAO TONG UNIV
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