Method for determining proportion of non-shrinkage concrete in steel pipe arch

Abstract

The application relates to the technical field of steel pipe concrete arch bridge construction, and particularly discloses a method for determining the proportioning of non-shrinkage concrete in a steel pipe arch, which comprises the following steps: testing the autogenous volume deformation of the concrete in the pipe; using an environment simulation test box to simulate the temperature history of the concrete in the pipe under actual working conditions, and testing the volume deformation of the concrete in the pipe under airtight and moisture-proof conditions; using a steel pipe component which is the same in size as the actual engineering steel pipe arch except for length to pour the concrete in the pipe, and monitoring the temperature history and volume deformation of the concrete; and determining the mix proportion of the non-shrinkage concrete in the pipe as the mix proportion of the non-shrinkage concrete in the pipe when the autogenous volume deformation 90d value, the temperature deformation 14d value and the component deformation 14d value are all greater than 0. The mix proportion of the non-shrinkage concrete in the pipe determined by the method can be applied to the construction of a CFST arch bridge, and can effectively guarantee the construction quality of the concrete in the steel pipe arch.

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