Wall brick hygroscopic-expansion-deformation dynamic testing instrument and testing method

Abstract

The invention discloses a wall brick hygroscopic-expansion-deformation dynamic testing instrument and testing method. The testing instrument comprises a dial indicator, a measuring frame, an electronic balance, a humidistat, a balance hood and a computer, wherein a glass dial indicator pedestal and a glass specimen pedestal are respectively provided with holes, and two quartz tube end sockets are respectively arranged in the holes on both sides; a first threaded rod is respectively arranged in each quartz tube, and is fixedly connected with a first nut and a second nut, and a first spring washer, a second spring washer, the quartz tube, the glass dial indicator pedestal and the glass specimen pedestal are respectively connected flexibly; the balance hood is used for ensuring the humidity in the humidistat from interference of the external environment; and a crystallizing dish containing a saturated solution is arranged in the humidistat and used for controlling and maintaining the humidity in the box body. The dynamic testing instrument can dynamically measure the air hygroscopic expansion deformation amount and hygroscopic capacity of the wall brick to obtain the expansion value-humidity content characteristic curve under isothermal conditions, thereby enhancing the measurement accuracy.

Description

technical field [0001] The invention relates to a dynamic test for hygroscopic expansion and deformation of wall bricks, in particular to a dynamic tester and test method for hygroscopic expansion and deformation of wall bricks, and belongs to the technical field of detection of wet expansion and dry shrinkage of building materials. Background technique [0002] As an important means to study the relationship between expansion deformation and moisture content of building materials, the hygroscopic swelling test is currently not available in China. The EU standards on the expansion and contraction of building materials standardize the definition and measurement method of the coefficient of wet expansion of building materials, and use the method of segmental measurement from low relative humidity to high relative humidity to measure the expansion value and content of each humidity stage under the internal steady state. Humidity rate, due to the limited amount of data, the rela...

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Problems solved by technology

This method has a large difference in the humidity gradient between the interior and the surface of the specimen, and cannot accurately reflect the relationship between the expansion value and the moisture content; and because of the small amount of data, it is easily affected by human measurement errors. The relative humidity change is small in the stage, and the corresponding expansion and deformation of the building materials are also small, which will amplify the relative measurement error and affect the accuracy of the entire hygroscopic expansion process measurement

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