Mechanism and control strategy of large-area concrete shrinkage cracks in the underground railway section

Abstract

The cracks of the large-area concrete structure in the underground railway section directly affect the structural safety and service life. How to take effective measures to control concrete shrinkage cracks is a difficulty to be solved in the project.In view of the crack control demand of large-area concrete structure cracks in a vehicle section of Wuhan metro, based on the existing engineering cases of large-area concrete structure, shrinkage crack mechanism and control strategies, the corresponding measures are proposed to prevent crack production from two aspects of concrete raw materials and construction technology.The results show that through the regulation of concrete materials,maintenance,casting,post-pouring belt, temperature monitoring and other links, the reduction of shrinkage cracks of large-area concrete structure in the underground railway section is realized.These results can provide references for similar projects to lessen cracks, ensure structural safety and construction quality.

Keywords

• underground railway section
• large-area of concrete
• shrinkage crack
• control strategy
• structural safety