产品介绍

(1). Test method： Eddy current method

(2). Standard： GBT 50082-2009 Standard for test methods of long-term performance and durability of ordinary concrete

(3). Test item： Displacement, temperature, humidity

(4). Description：

Concrete shrinkage cracking is closely related to the concrete early age (3d) shrinkage performance, but it cannot be detected by traditional shrinkage performance testing methods. During this period, the shrinkage properties of concrete, especially high-fluidity concrete, have the most frequent and complex changes, such as plastic settlement shrinkage, autogenous shrinkage, chemical shrinkage and drying shrinkage.

This instrument is designed according to GBT 50082-2009 Standard for test methods of long-term performance and durability of ordinary concrete, as Eddy current method. This method is manyly sued to determine the free shrinkage and deformation of early age concrete and also may be sued to determine the autogenous shrinkage distortion of concrete at unconstrained state.

(5). Features：

1. Adopt high-precision eddy current displacement sensor, stable performance and accurate measurement

2. True color touch screen operation, friendly and convenient interface, simple and fast operation

3. The host adopts high-performance embedded data acquisition system and efficient and reliable operating system to ensure reliable and stable operation under unattended conditions

4. The curves of specimen shrinkage, temperature and humidity changes are directly displayed, and the data changes are clear at a glance

5. The embedded printer prints instantly, which is convenient for users to save data

6. Automatic recovery after power failure, data is stable and reliable

7. Large Data file storage capacity: The instrument can store a large quantity of original test data files, and the test data files can be stored on the storage device through U disk and SD card

8. The placement of the displacement sensor probe adjustment device is simple and reliable: the displacement sensor probe adjustment device is installed on the concrete mould through four fastening bolts, which is easy to operate and reliable to fix.

9. A dedicated integrated temperature and humidity sensor synchronously monitors the ambient temperature and humidity of the experimental site in real time

10. The instrument also provides a dedicated interface for users to choose a disposable low-cost digital temperature sensor that can be embedded in the concrete specimen to achieve synchronous real-time monitoring of the internal temperature of the tested concrete specimen.

(6). Application areas:

Concrete technology research, concrete production, quality supervision and inspection departments, and hydropower, highway, railway and other engineering departments need to determine the shrinkage and deformation of concrete.

(7). Detection principle:

When the eddy current sensor is powered on, its pre-amp will generate a high-frequency current signal, which can generate an alternating magnetic field at the probe head and an eddy current field on the surface of the metal conductor near it. The specific nonlinear function is derived, and the function can be used to calculate the concrete shrinkage in a specified time by changing.

(8). Parameters：

Voltage：AC 220V

Test range：2.0mm

Test precision：smaller than 2μm,16 digital AD collection

Temperature precision：±0.3℃

Humidity precision：±2%

Working temperature：0℃ — +40℃

Working humidity ： no condensation

System：ARM920T，32bit， 600MHZ, 64M,  256Mbyte

(9). Configuration:

1. Main host  1set

2. Ambient temp and humidity sensor 1pc

3. Temperature probe     4pcs

4. Displacement sensor 6pcs

5 Displacement sensor fixture 6pcs

6. Focus fixture 6pcs

7. U disk/SD card  1pcs

8. USB to RS232 Cable 1pc

9. Power cable 1pc