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Concrete steam curing method in subway construction

A steam curing and concrete technology, which is applied in the field of engineering construction, can solve the problems of reduced hydration products, reduced concrete performance, insufficient hydration of cementitious materials, etc., to reduce peeling and cracks, reduce costs, and improve maintenance efficiency Effect

Inactive Publication Date: 2019-11-22
CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR
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  • Application Information

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Problems solved by technology

If the concrete is not cured in time after construction, the internal moisture will evaporate to the outside through the capillary pores of the system, resulting in insufficient hydration of the cementitious material and reduction of hydration products, which will lead to a decline in the performance of the concrete

Method used

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  • Concrete steam curing method in subway construction
  • Concrete steam curing method in subway construction

Examples

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Embodiment 1

[0045] In the winter subway construction in a certain place in the south, the steam curing of the concrete of the main structure of the subway construction station is carried out according to the following procedures:

[0046] 1. Concrete finish

[0047] After vibrating and stopping for 3 minutes, the concrete surface at the bottom of the slab should be closed, and the edges and corners should be filled. When the concrete slump is large, spread clean gravel with a diameter of 1cm-2cm in the longitudinal anchor hole and the lifting position and smooth it into the concrete. After the concrete at the bottom of the slab is closed, it is necessary to take protective measures on the concrete slab, and it is strictly forbidden to step on it before the final setting.

[0048] After the concrete is vibrated for 20-30 minutes, cover the concrete surface with a geotextile moistened with water; then cover with a tarpaulin and sprinkle water to prevent the concrete from dispersing too qui...

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Abstract

The invention provides a concrete steam curing method in subway construction, which comprises the following steps: after concrete pouring of a station main body structure is completed, constructing acuring tarpaulin, performing standing treatment for 3-5 hours, and carrying out heating steam curing at a heating rate of 15 DEG C / h or below; increasing the temperature to 45 DEG C, and performing constant-temperature steam curing for more than 6 hours; and then cooling the concrete at the cooling speed not larger than 10 DEG C / h, wherein the temperature difference between the surface of the station body structure and the environment is below 15 DEG C. According to the method, by adjusting the construction process, the phenomena of concrete peeling and cracking are effectively reduced, and the appearance quality of concrete steam curing is improved; meanwhile, when the method is adopted for concrete steam curing, the curing work efficiency can be improved, the cost can be reduced, later maintenance can be omitted, waste of manpower and materials can be avoided, meanwhile, the construction progress can be accelerated, and the cost can be saved.

Description

technical field [0001] The invention relates to the field of engineering construction, in particular to a method for concrete steam curing in subway construction. Background technique [0002] Concrete is one of the most widely used and used building materials in construction projects. Its mechanical properties and durability depend not only on the composition and ratio of raw materials, but also on post-maintenance methods. If the concrete is not maintained in time after construction, its internal water will evaporate to the outside through the capillary pores of the system, resulting in insufficient hydration of the cementitious material and reduction of hydration products, thereby causing the performance of the concrete to decline. Therefore, curing is crucial to the development of concrete properties. [0003] Steam curing is a traditional concrete curing method. During the steam curing process, the hydration rate of the cement in the concrete can be accelerated by heat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B40/02
CPCC04B40/024
Inventor 范志高程传过程雨池王宁贾琼崔保鹏车龙杭翔申晋平
Owner CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR
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