Method for testing early stage shrinkage and anti-cracking performances of premixed concrete wall

Abstract

The invention discloses a method for testing early stage shrinkage and anti-cracking performances of a premixed concrete wall. The method for testing the early stage shrinkage and anti-cracking performances of the premixed concrete wall comprises the following steps: firstly, knowing general situation of a wall, and arranging test points; secondly, testing hydration heat of concrete of the wall; thirdly, pouring the wall by adopting premixed concrete; fourthly, analyzing test results. According to the method for testing the early stage shrinkage and anti-cracking performances of the premixed concrete wall, testing on the early stage shrinkage and anti-cracking performances of the premixed concrete wall is carried out on an engineering practical wall, concrete shrinkage deformation, reinforcing steel bar deformation and temperature variation are determined at the same time in the concrete wall, shrinkage change rules of practical wall concrete are explored, and influence rules of adjacent component constraint, constraint in the reinforcing steel bar and a construction sequence and method to shrinkage and cracking of concrete of a component are analyzed; meanwhile, the original data is accumulated, and test data foundation is provided for possible mechanical calculation and analysis; besides, relation between laboratory data and engineering practical data is obtained, so that laboratory basic data can guide engineering application more directly and effectively.

Description

technical field [0001] The invention belongs to the technical field of building construction, in particular to a method for testing the early shrinkage and crack resistance of ready-mixed concrete walls. Background technique [0002] Cracks often occur in cast-in-place concrete structures before normal use, that is, during construction. At this time, the structure usually has not yet bear the full load under normal use. Such cracks are mostly caused by indirect effects such as non-load deformation (shrinkage, temperature, etc.) Analysis of survey data at home and abroad shows that: "In engineering practice, the causes of cracks in structures are caused by deformation changes (temperature, shrinkage, uneven subsidence) and account for more than 80%; those caused by loads account for about 20% In this paper, the cracks caused mainly by indirect effects (shrinkage, temperature, etc.) during the construction period are called "indirect cracks during construction". During the pe...

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a method for testing the early shrinkage and crack resistance of ready-mixed concrete walls, aiming to solve the problem that the impact of early shrinkage deformation and crack resistance of concrete cannot be studied in the laboratory

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